chess : tuning performance

wchess : add clear_audio callback

.github/workflows/build.yml

@@ -320,6 +320,13 @@ jobs:
           cd ./build
           msbuild ALL_BUILD.vcxproj -t:build -p:configuration=${{ matrix.build }} -p:platform=${{ matrix.arch }}
 
+      - name: Copy CUDA DLLs
+        run: >
+          Copy-Item -PassThru
+          -Path "${{ steps.cuda-toolkit.outputs.CUDA_PATH }}/bin/*.dll"
+          -Include cudart64_*,cublas64_*,cublasLt64_*
+          -Destination build/bin/${{ matrix.build }}
+
       - name: Copy SDL2.dll
         if: matrix.sdl2 == 'ON'
         run: copy "$env:SDL2_DIR/../lib/${{ matrix.s2arc }}/SDL2.dll" build/bin/${{ matrix.build }}

.gitignore

@@ -31,6 +31,7 @@ build-sanitize-thread/
 /talk-llama
 /bench
 /quantize
+/server
 /lsp
 
 arm_neon.h

Makefile

@@ -1,4 +1,4 @@
-default: main bench quantize
+default: main bench quantize server
 
 ifndef UNAME_S
 UNAME_S := $(shell uname -s)
@@ -338,7 +338,7 @@ libwhisper.so: $(WHISPER_OBJ)
 	$(CXX) $(CXXFLAGS) -shared -o libwhisper.so $(WHISPER_OBJ) $(LDFLAGS)
 
 clean:
-	rm -f *.o main stream command talk talk-llama bench quantize lsp libwhisper.a libwhisper.so
+	rm -f *.o main stream command talk talk-llama bench quantize server lsp libwhisper.a libwhisper.so
 
 #
 # Examples
@@ -359,6 +359,9 @@ bench: examples/bench/bench.cpp $(WHISPER_OBJ)
 quantize: examples/quantize/quantize.cpp $(WHISPER_OBJ) $(SRC_COMMON)
 	$(CXX) $(CXXFLAGS) examples/quantize/quantize.cpp $(SRC_COMMON) $(WHISPER_OBJ) -o quantize $(LDFLAGS)
 
+server: examples/server/server.cpp $(SRC_COMMON) $(WHISPER_OBJ)
+	$(CXX) $(CXXFLAGS) examples/server/server.cpp $(SRC_COMMON) $(WHISPER_OBJ) -o server $(LDFLAGS)
+
 stream: examples/stream/stream.cpp $(SRC_COMMON) $(SRC_COMMON_SDL) $(WHISPER_OBJ)
 	$(CXX) $(CXXFLAGS) examples/stream/stream.cpp $(SRC_COMMON) $(SRC_COMMON_SDL) $(WHISPER_OBJ) -o stream $(CC_SDL) $(LDFLAGS)
 

examples/CMakeLists.txt

@@ -65,6 +65,7 @@ elseif(CMAKE_JS_VERSION)
 else()
     add_subdirectory(main)
     add_subdirectory(stream)
+    add_subdirectory(server)
     add_subdirectory(command)
     add_subdirectory(bench)
     add_subdirectory(quantize)
@@ -72,3 +73,5 @@ else()
     add_subdirectory(talk-llama)
     add_subdirectory(lsp)
 endif()
+
+add_subdirectory(wchess)

examples/common-sdl.cpp

@@ -139,10 +139,13 @@ void audio_async::callback(uint8_t * stream, int len) {
         return;
     }
 
-    const size_t n_samples = len / sizeof(float);
+    size_t n_samples = len / sizeof(float);
 
-    m_audio_new.resize(n_samples);
+    if (n_samples > m_audio.size()) {
-    memcpy(m_audio_new.data(), stream, n_samples * sizeof(float));
+        n_samples = m_audio.size();
+
+        stream += (len - (n_samples * sizeof(float)));
+    }
 
     //fprintf(stderr, "%s: %zu samples, pos %zu, len %zu\n", __func__, n_samples, m_audio_pos, m_audio_len);
 
@@ -153,7 +156,7 @@ void audio_async::callback(uint8_t * stream, int len) {
             const size_t n0 = m_audio.size() - m_audio_pos;
 
             memcpy(&m_audio[m_audio_pos], stream, n0 * sizeof(float));
-            memcpy(&m_audio[0], &stream[n0], (n_samples - n0) * sizeof(float));
+            memcpy(&m_audio[0], stream + n0 * sizeof(float), (n_samples - n0) * sizeof(float));
 
             m_audio_pos = (m_audio_pos + n_samples) % m_audio.size();
             m_audio_len = m_audio.size();

examples/common-sdl.h

@@ -41,7 +41,6 @@ private:
     std::mutex       m_mutex;
 
     std::vector<float> m_audio;
-    std::vector<float> m_audio_new;
     size_t             m_audio_pos = 0;
     size_t             m_audio_len = 0;
 };

examples/main/main.cpp

@@ -165,8 +165,8 @@ bool whisper_params_parse(int argc, char ** argv, whisper_params & params) {
         else if (arg == "-m"    || arg == "--model")           { params.model           = argv[++i]; }
         else if (arg == "-f"    || arg == "--file")            { params.fname_inp.emplace_back(argv[++i]); }
         else if (arg == "-oved" || arg == "--ov-e-device")     { params.openvino_encode_device = argv[++i]; }
-        else if (arg == "-ls"   || arg == "--log-score")       { params.log_score = true; }
+        else if (arg == "-ls"   || arg == "--log-score")       { params.log_score       = true; }
-        else if (arg == "-ng"   || arg == "--no-gpu")          { params.use_gpu = false; }
+        else if (arg == "-ng"   || arg == "--no-gpu")          { params.use_gpu         = false; }
         else {
             fprintf(stderr, "error: unknown argument: %s\n", arg.c_str());
             whisper_print_usage(argc, argv, params);

examples/server/CMakeLists.txt

@@ -0,0 +1,6 @@
+set(TARGET server)
+add_executable(${TARGET} server.cpp httplib.h json.hpp)
+
+include(DefaultTargetOptions)
+
+target_link_libraries(${TARGET} PRIVATE common whisper ${CMAKE_THREAD_LIBS_INIT})

examples/server/README.md

@@ -0,0 +1,59 @@
+# whisper.cpp http server
+
+Simple http server. WAV Files are passed to the inference model via http requests.
+
+```
+./server -h
+
+usage: ./bin/server [options]
+
+options:
+  -h,        --help              [default] show this help message and exit
+  -t N,      --threads N         [4      ] number of threads to use during computation
+  -p N,      --processors N      [1      ] number of processors to use during computation
+  -ot N,     --offset-t N        [0      ] time offset in milliseconds
+  -on N,     --offset-n N        [0      ] segment index offset
+  -d  N,     --duration N        [0      ] duration of audio to process in milliseconds
+  -mc N,     --max-context N     [-1     ] maximum number of text context tokens to store
+  -ml N,     --max-len N         [0      ] maximum segment length in characters
+  -sow,      --split-on-word     [false  ] split on word rather than on token
+  -bo N,     --best-of N         [2      ] number of best candidates to keep
+  -bs N,     --beam-size N       [-1     ] beam size for beam search
+  -wt N,     --word-thold N      [0.01   ] word timestamp probability threshold
+  -et N,     --entropy-thold N   [2.40   ] entropy threshold for decoder fail
+  -lpt N,    --logprob-thold N   [-1.00  ] log probability threshold for decoder fail
+  -debug,    --debug-mode        [false  ] enable debug mode (eg. dump log_mel)
+  -tr,       --translate         [false  ] translate from source language to english
+  -di,       --diarize           [false  ] stereo audio diarization
+  -tdrz,     --tinydiarize       [false  ] enable tinydiarize (requires a tdrz model)
+  -nf,       --no-fallback       [false  ] do not use temperature fallback while decoding
+  -ps,       --print-special     [false  ] print special tokens
+  -pc,       --print-colors      [false  ] print colors
+  -pp,       --print-progress    [false  ] print progress
+  -nt,       --no-timestamps     [false  ] do not print timestamps
+  -l LANG,   --language LANG     [en     ] spoken language ('auto' for auto-detect)
+  -dl,       --detect-language   [false  ] exit after automatically detecting language
+             --prompt PROMPT     [       ] initial prompt
+  -m FNAME,  --model FNAME       [models/ggml-base.en.bin] model path
+  -oved D,   --ov-e-device DNAME [CPU    ] the OpenVINO device used for encode inference
+  --host HOST,                   [127.0.0.1] Hostname/ip-adress for the server
+  --port PORT,                   [8080   ] Port number for the server
+```
+
+## request examples
+
+**/inference**
+```
+curl 127.0.0.1:8080/inference \
+-H "Content-Type: multipart/form-data" \
+-F file="@<file-path>" \
+-F temperature="0.2" \
+-F response-format="json"
+```
+
+**/load**
+```
+curl 127.0.0.1:8080/load \
+-H "Content-Type: multipart/form-data" \
+-F model="<path-to-model-file>"
+```

examples/server/server.cpp

@@ -0,0 +1,699 @@
+#include "common.h"
+
+#include "whisper.h"
+#include "httplib.h"
+#include "json.hpp"
+
+#include <cmath>
+#include <fstream>
+#include <cstdio>
+#include <string>
+#include <thread>
+#include <vector>
+#include <cstring>
+
+#if defined(_MSC_VER)
+#pragma warning(disable: 4244 4267) // possible loss of data
+#endif
+
+using namespace httplib;
+using json = nlohmann::json;
+
+namespace {
+
+// Terminal color map. 10 colors grouped in ranges [0.0, 0.1, ..., 0.9]
+// Lowest is red, middle is yellow, highest is green.
+const std::vector<std::string> k_colors = {
+    "\033[38;5;196m", "\033[38;5;202m", "\033[38;5;208m", "\033[38;5;214m", "\033[38;5;220m",
+    "\033[38;5;226m", "\033[38;5;190m", "\033[38;5;154m", "\033[38;5;118m", "\033[38;5;82m",
+};
+
+// output formats
+const std::string json_format   = "json";
+const std::string text_format   = "text";
+const std::string srt_format    = "srt";
+const std::string vjson_format  = "verbose_json";
+const std::string vtt_format    = "vtt";
+
+struct server_params
+{
+    std::string hostname = "127.0.0.1";
+    std::string public_path = "examples/server/public";
+
+    int32_t port          = 8080;
+    int32_t read_timeout  = 600;
+    int32_t write_timeout = 600;
+};
+
+struct whisper_params {
+    int32_t n_threads    = std::min(4, (int32_t) std::thread::hardware_concurrency());
+    int32_t n_processors =  1;
+    int32_t offset_t_ms  =  0;
+    int32_t offset_n     =  0;
+    int32_t duration_ms  =  0;
+    int32_t progress_step =  5;
+    int32_t max_context  = -1;
+    int32_t max_len      =  0;
+    int32_t best_of      =  2;
+    int32_t beam_size    = -1;
+
+    float word_thold    =  0.01f;
+    float entropy_thold =  2.40f;
+    float logprob_thold = -1.00f;
+    float userdef_temp  =  0.20f;
+
+    bool speed_up        = false;
+    bool debug_mode      = false;
+    bool translate       = false;
+    bool detect_language = false;
+    bool diarize         = false;
+    bool tinydiarize     = false;
+    bool split_on_word   = false;
+    bool no_fallback     = false;
+    bool print_special   = false;
+    bool print_colors    = false;
+    bool print_progress  = false;
+    bool no_timestamps   = false;
+    bool use_gpu         = true;
+
+    std::string language        = "en";
+    std::string prompt          = "";
+    std::string font_path       = "/System/Library/Fonts/Supplemental/Courier New Bold.ttf";
+    std::string model           = "models/ggml-base.en.bin";
+
+    std::string response_format     = json_format;
+
+    // [TDRZ] speaker turn string
+    std::string tdrz_speaker_turn = " [SPEAKER_TURN]"; // TODO: set from command line
+
+    std::string openvino_encode_device = "CPU";
+};
+
+//  500 -> 00:05.000
+// 6000 -> 01:00.000
+std::string to_timestamp(int64_t t, bool comma = false) {
+    int64_t msec = t * 10;
+    int64_t hr = msec / (1000 * 60 * 60);
+    msec = msec - hr * (1000 * 60 * 60);
+    int64_t min = msec / (1000 * 60);
+    msec = msec - min * (1000 * 60);
+    int64_t sec = msec / 1000;
+    msec = msec - sec * 1000;
+
+    char buf[32];
+    snprintf(buf, sizeof(buf), "%02d:%02d:%02d%s%03d", (int) hr, (int) min, (int) sec, comma ? "," : ".", (int) msec);
+
+    return std::string(buf);
+}
+
+int timestamp_to_sample(int64_t t, int n_samples) {
+    return std::max(0, std::min((int) n_samples - 1, (int) ((t*WHISPER_SAMPLE_RATE)/100)));
+}
+
+bool is_file_exist(const char *fileName)
+{
+    std::ifstream infile(fileName);
+    return infile.good();
+}
+
+void whisper_print_usage(int /*argc*/, char ** argv, const whisper_params & params,
+                         const server_params& sparams) {
+    fprintf(stderr, "\n");
+    fprintf(stderr, "usage: %s [options] \n", argv[0]);
+    fprintf(stderr, "\n");
+    fprintf(stderr, "options:\n");
+    fprintf(stderr, "  -h,        --help              [default] show this help message and exit\n");
+    fprintf(stderr, "  -t N,      --threads N         [%-7d] number of threads to use during computation\n",    params.n_threads);
+    fprintf(stderr, "  -p N,      --processors N      [%-7d] number of processors to use during computation\n", params.n_processors);
+    fprintf(stderr, "  -ot N,     --offset-t N        [%-7d] time offset in milliseconds\n",                    params.offset_t_ms);
+    fprintf(stderr, "  -on N,     --offset-n N        [%-7d] segment index offset\n",                           params.offset_n);
+    fprintf(stderr, "  -d  N,     --duration N        [%-7d] duration of audio to process in milliseconds\n",   params.duration_ms);
+    fprintf(stderr, "  -mc N,     --max-context N     [%-7d] maximum number of text context tokens to store\n", params.max_context);
+    fprintf(stderr, "  -ml N,     --max-len N         [%-7d] maximum segment length in characters\n",           params.max_len);
+    fprintf(stderr, "  -sow,      --split-on-word     [%-7s] split on word rather than on token\n",             params.split_on_word ? "true" : "false");
+    fprintf(stderr, "  -bo N,     --best-of N         [%-7d] number of best candidates to keep\n",              params.best_of);
+    fprintf(stderr, "  -bs N,     --beam-size N       [%-7d] beam size for beam search\n",                      params.beam_size);
+    fprintf(stderr, "  -wt N,     --word-thold N      [%-7.2f] word timestamp probability threshold\n",         params.word_thold);
+    fprintf(stderr, "  -et N,     --entropy-thold N   [%-7.2f] entropy threshold for decoder fail\n",           params.entropy_thold);
+    fprintf(stderr, "  -lpt N,    --logprob-thold N   [%-7.2f] log probability threshold for decoder fail\n",   params.logprob_thold);
+    // fprintf(stderr, "  -su,       --speed-up          [%-7s] speed up audio by x2 (reduced accuracy)\n",        params.speed_up ? "true" : "false");
+    fprintf(stderr, "  -debug,    --debug-mode        [%-7s] enable debug mode (eg. dump log_mel)\n",           params.debug_mode ? "true" : "false");
+    fprintf(stderr, "  -tr,       --translate         [%-7s] translate from source language to english\n",      params.translate ? "true" : "false");
+    fprintf(stderr, "  -di,       --diarize           [%-7s] stereo audio diarization\n",                       params.diarize ? "true" : "false");
+    fprintf(stderr, "  -tdrz,     --tinydiarize       [%-7s] enable tinydiarize (requires a tdrz model)\n",     params.tinydiarize ? "true" : "false");
+    fprintf(stderr, "  -nf,       --no-fallback       [%-7s] do not use temperature fallback while decoding\n", params.no_fallback ? "true" : "false");
+    fprintf(stderr, "  -ps,       --print-special     [%-7s] print special tokens\n",                           params.print_special ? "true" : "false");
+    fprintf(stderr, "  -pc,       --print-colors      [%-7s] print colors\n",                                   params.print_colors ? "true" : "false");
+    fprintf(stderr, "  -pp,       --print-progress    [%-7s] print progress\n",                                 params.print_progress ? "true" : "false");
+    fprintf(stderr, "  -nt,       --no-timestamps     [%-7s] do not print timestamps\n",                        params.no_timestamps ? "true" : "false");
+    fprintf(stderr, "  -l LANG,   --language LANG     [%-7s] spoken language ('auto' for auto-detect)\n",       params.language.c_str());
+    fprintf(stderr, "  -dl,       --detect-language   [%-7s] exit after automatically detecting language\n",    params.detect_language ? "true" : "false");
+    fprintf(stderr, "             --prompt PROMPT     [%-7s] initial prompt\n",                                 params.prompt.c_str());
+    fprintf(stderr, "  -m FNAME,  --model FNAME       [%-7s] model path\n",                                     params.model.c_str());
+    fprintf(stderr, "  -oved D,   --ov-e-device DNAME [%-7s] the OpenVINO device used for encode inference\n",  params.openvino_encode_device.c_str());
+    // server params
+    fprintf(stderr, "  --host HOST,                   [%-7s] Hostname/ip-adress for the server\n", sparams.hostname.c_str());
+    fprintf(stderr, "  --port PORT,                   [%-7d] Port number for the server\n", sparams.port);
+    fprintf(stderr, "  --public PATH,                 [%-7s] Path to the public folder\n", sparams.public_path.c_str());
+    fprintf(stderr, "\n");
+}
+
+bool whisper_params_parse(int argc, char ** argv, whisper_params & params, server_params & sparams) {
+    for (int i = 1; i < argc; i++) {
+        std::string arg = argv[i];
+
+        if (arg == "-h" || arg == "--help") {
+            whisper_print_usage(argc, argv, params, sparams);
+            exit(0);
+        }
+        else if (arg == "-t"    || arg == "--threads")         { params.n_threads       = std::stoi(argv[++i]); }
+        else if (arg == "-p"    || arg == "--processors")      { params.n_processors    = std::stoi(argv[++i]); }
+        else if (arg == "-ot"   || arg == "--offset-t")        { params.offset_t_ms     = std::stoi(argv[++i]); }
+        else if (arg == "-on"   || arg == "--offset-n")        { params.offset_n        = std::stoi(argv[++i]); }
+        else if (arg == "-d"    || arg == "--duration")        { params.duration_ms     = std::stoi(argv[++i]); }
+        else if (arg == "-mc"   || arg == "--max-context")     { params.max_context     = std::stoi(argv[++i]); }
+        else if (arg == "-ml"   || arg == "--max-len")         { params.max_len         = std::stoi(argv[++i]); }
+        else if (arg == "-bo"   || arg == "--best-of")         { params.best_of         = std::stoi(argv[++i]); }
+        else if (arg == "-bs"   || arg == "--beam-size")       { params.beam_size       = std::stoi(argv[++i]); }
+        else if (arg == "-wt"   || arg == "--word-thold")      { params.word_thold      = std::stof(argv[++i]); }
+        else if (arg == "-et"   || arg == "--entropy-thold")   { params.entropy_thold   = std::stof(argv[++i]); }
+        else if (arg == "-lpt"  || arg == "--logprob-thold")   { params.logprob_thold   = std::stof(argv[++i]); }
+        // else if (arg == "-su"   || arg == "--speed-up")        { params.speed_up        = true; }
+        else if (arg == "-debug"|| arg == "--debug-mode")      { params.debug_mode      = true; }
+        else if (arg == "-tr"   || arg == "--translate")       { params.translate       = true; }
+        else if (arg == "-di"   || arg == "--diarize")         { params.diarize         = true; }
+        else if (arg == "-tdrz" || arg == "--tinydiarize")     { params.tinydiarize     = true; }
+        else if (arg == "-sow"  || arg == "--split-on-word")   { params.split_on_word   = true; }
+        else if (arg == "-nf"   || arg == "--no-fallback")     { params.no_fallback     = true; }
+        else if (arg == "-fp"   || arg == "--font-path")       { params.font_path       = argv[++i]; }
+        else if (arg == "-ps"   || arg == "--print-special")   { params.print_special   = true; }
+        else if (arg == "-pc"   || arg == "--print-colors")    { params.print_colors    = true; }
+        else if (arg == "-pp"   || arg == "--print-progress")  { params.print_progress  = true; }
+        else if (arg == "-nt"   || arg == "--no-timestamps")   { params.no_timestamps   = true; }
+        else if (arg == "-l"    || arg == "--language")        { params.language        = argv[++i]; }
+        else if (arg == "-dl"   || arg == "--detect-language") { params.detect_language = true; }
+        else if (                  arg == "--prompt")          { params.prompt          = argv[++i]; }
+        else if (arg == "-m"    || arg == "--model")           { params.model           = argv[++i]; }
+        else if (arg == "-oved" || arg == "--ov-e-device")     { params.openvino_encode_device = argv[++i]; }
+        else if (arg == "-ng"   || arg == "--no-gpu")          { params.use_gpu         = false; }
+        // server params
+        else if (                  arg == "--port")            { sparams.port        = std::stoi(argv[++i]); }
+        else if (                  arg == "--host")            { sparams.hostname    = argv[++i]; }
+        else if (                  arg == "--public")          { sparams.public_path = argv[++i]; }
+        else {
+            fprintf(stderr, "error: unknown argument: %s\n", arg.c_str());
+            whisper_print_usage(argc, argv, params, sparams);
+            exit(0);
+        }
+    }
+
+    return true;
+}
+
+struct whisper_print_user_data {
+    const whisper_params * params;
+
+    const std::vector<std::vector<float>> * pcmf32s;
+    int progress_prev;
+};
+
+std::string estimate_diarization_speaker(std::vector<std::vector<float>> pcmf32s, int64_t t0, int64_t t1, bool id_only = false) {
+    std::string speaker = "";
+    const int64_t n_samples = pcmf32s[0].size();
+
+    const int64_t is0 = timestamp_to_sample(t0, n_samples);
+    const int64_t is1 = timestamp_to_sample(t1, n_samples);
+
+    double energy0 = 0.0f;
+    double energy1 = 0.0f;
+
+    for (int64_t j = is0; j < is1; j++) {
+        energy0 += fabs(pcmf32s[0][j]);
+        energy1 += fabs(pcmf32s[1][j]);
+    }
+
+    if (energy0 > 1.1*energy1) {
+        speaker = "0";
+    } else if (energy1 > 1.1*energy0) {
+        speaker = "1";
+    } else {
+        speaker = "?";
+    }
+
+    //printf("is0 = %lld, is1 = %lld, energy0 = %f, energy1 = %f, speaker = %s\n", is0, is1, energy0, energy1, speaker.c_str());
+
+    if (!id_only) {
+        speaker.insert(0, "(speaker ");
+        speaker.append(")");
+    }
+
+    return speaker;
+}
+
+void whisper_print_progress_callback(struct whisper_context * /*ctx*/, struct whisper_state * /*state*/, int progress, void * user_data) {
+    int progress_step = ((whisper_print_user_data *) user_data)->params->progress_step;
+    int * progress_prev  = &(((whisper_print_user_data *) user_data)->progress_prev);
+    if (progress >= *progress_prev + progress_step) {
+        *progress_prev += progress_step;
+        fprintf(stderr, "%s: progress = %3d%%\n", __func__, progress);
+    }
+}
+
+void whisper_print_segment_callback(struct whisper_context * ctx, struct whisper_state * /*state*/, int n_new, void * user_data) {
+    const auto & params  = *((whisper_print_user_data *) user_data)->params;
+    const auto & pcmf32s = *((whisper_print_user_data *) user_data)->pcmf32s;
+
+    const int n_segments = whisper_full_n_segments(ctx);
+
+    std::string speaker = "";
+
+    int64_t t0 = 0;
+    int64_t t1 = 0;
+
+    // print the last n_new segments
+    const int s0 = n_segments - n_new;
+
+    if (s0 == 0) {
+        printf("\n");
+    }
+
+    for (int i = s0; i < n_segments; i++) {
+        if (!params.no_timestamps || params.diarize) {
+            t0 = whisper_full_get_segment_t0(ctx, i);
+            t1 = whisper_full_get_segment_t1(ctx, i);
+        }
+
+        if (!params.no_timestamps) {
+            printf("[%s --> %s]  ", to_timestamp(t0).c_str(), to_timestamp(t1).c_str());
+        }
+
+        if (params.diarize && pcmf32s.size() == 2) {
+            speaker = estimate_diarization_speaker(pcmf32s, t0, t1);
+        }
+
+        if (params.print_colors) {
+            for (int j = 0; j < whisper_full_n_tokens(ctx, i); ++j) {
+                if (params.print_special == false) {
+                    const whisper_token id = whisper_full_get_token_id(ctx, i, j);
+                    if (id >= whisper_token_eot(ctx)) {
+                        continue;
+                    }
+                }
+
+                const char * text = whisper_full_get_token_text(ctx, i, j);
+                const float  p    = whisper_full_get_token_p   (ctx, i, j);
+
+                const int col = std::max(0, std::min((int) k_colors.size() - 1, (int) (std::pow(p, 3)*float(k_colors.size()))));
+
+                printf("%s%s%s%s", speaker.c_str(), k_colors[col].c_str(), text, "\033[0m");
+            }
+        } else {
+            const char * text = whisper_full_get_segment_text(ctx, i);
+
+            printf("%s%s", speaker.c_str(), text);
+        }
+
+        if (params.tinydiarize) {
+            if (whisper_full_get_segment_speaker_turn_next(ctx, i)) {
+                printf("%s", params.tdrz_speaker_turn.c_str());
+            }
+        }
+
+        // with timestamps or speakers: each segment on new line
+        if (!params.no_timestamps || params.diarize) {
+            printf("\n");
+        }
+        fflush(stdout);
+    }
+}
+
+std::string output_str(struct whisper_context * ctx, const whisper_params & params, std::vector<std::vector<float>> pcmf32s) {
+    std::stringstream result;
+    const int n_segments = whisper_full_n_segments(ctx);
+    for (int i = 0; i < n_segments; ++i) {
+        const char * text = whisper_full_get_segment_text(ctx, i);
+        std::string speaker = "";
+
+        if (params.diarize && pcmf32s.size() == 2)
+        {
+            const int64_t t0 = whisper_full_get_segment_t0(ctx, i);
+            const int64_t t1 = whisper_full_get_segment_t1(ctx, i);
+            speaker = estimate_diarization_speaker(pcmf32s, t0, t1);
+        }
+
+        result << speaker << text << "\n";
+    }
+    return result.str();
+}
+
+void get_req_parameters(const Request & req, whisper_params & params)
+{
+    // user model configu.has_fileion
+    if (req.has_file("offset-t"))
+    {
+        params.offset_t_ms = std::stoi(req.get_file_value("offset-t").content);
+    }
+    if (req.has_file("offset-n"))
+    {
+        params.offset_n = std::stoi(req.get_file_value("offset-n").content);
+    }
+    if (req.has_file("duration"))
+    {
+        params.duration_ms = std::stoi(req.get_file_value("duration").content);
+    }
+    if (req.has_file("max-context"))
+    {
+        params.max_context = std::stoi(req.get_file_value("max-context").content);
+    }
+    if (req.has_file("prompt"))
+    {
+        params.prompt = req.get_file_value("prompt").content;
+    }
+    if (req.has_file("response-format"))
+    {
+        params.response_format = req.get_file_value("response-format").content;
+    }
+    if (req.has_file("temerature"))
+    {
+        params.userdef_temp = std::stof(req.get_file_value("temperature").content);
+    }
+}
+
+}  // namespace
+
+int main(int argc, char ** argv) {
+    whisper_params params;
+    server_params sparams;
+
+    std::mutex whisper_mutex;
+
+    if (whisper_params_parse(argc, argv, params, sparams) == false) {
+        whisper_print_usage(argc, argv, params, sparams);
+        return 1;
+    }
+
+    if (params.language != "auto" && whisper_lang_id(params.language.c_str()) == -1) {
+        fprintf(stderr, "error: unknown language '%s'\n", params.language.c_str());
+        whisper_print_usage(argc, argv, params, sparams);
+        exit(0);
+    }
+
+    if (params.diarize && params.tinydiarize) {
+        fprintf(stderr, "error: cannot use both --diarize and --tinydiarize\n");
+        whisper_print_usage(argc, argv, params, sparams);
+        exit(0);
+    }
+
+    // whisper init
+    struct whisper_context_params cparams;
+    cparams.use_gpu = params.use_gpu;
+
+    struct whisper_context * ctx = whisper_init_from_file_with_params(params.model.c_str(), cparams);
+
+    if (ctx == nullptr) {
+        fprintf(stderr, "error: failed to initialize whisper context\n");
+        return 3;
+    }
+
+    // initialize openvino encoder. this has no effect on whisper.cpp builds that don't have OpenVINO configured
+    whisper_ctx_init_openvino_encoder(ctx, nullptr, params.openvino_encode_device.c_str(), nullptr);
+
+    Server svr;
+
+    std::string const default_content = "<html>hello</html>";
+
+    // this is only called if no index.html is found in the public --path
+    svr.Get("/", [&default_content](const Request &, Response &res){
+        res.set_content(default_content, "text/html");
+        return false;
+    });
+
+    svr.Post("/inference", [&](const Request &req, Response &res){
+        // aquire whisper model mutex lock
+        whisper_mutex.lock();
+
+        // first check user requested fields of the request
+        if (!req.has_file("file"))
+        {
+            fprintf(stderr, "error: no 'file' field in the request\n");
+            const std::string error_resp = "{\"error\":\"no 'file' field in the request\"}";
+            res.set_content(error_resp, "application/json");
+            whisper_mutex.unlock();
+            return;
+        }
+        auto audio_file = req.get_file_value("file");
+
+        // check non-required fields
+        get_req_parameters(req, params);
+
+        std::string filename{audio_file.filename};
+        printf("Received request: %s\n", filename.c_str());
+
+        // audio arrays
+        std::vector<float> pcmf32;               // mono-channel F32 PCM
+        std::vector<std::vector<float>> pcmf32s; // stereo-channel F32 PCM
+
+        // write file to temporary file
+        std::ofstream temp_file{filename, std::ios::binary};
+        temp_file << audio_file.content;
+
+        // read wav content into pcmf32
+        if (!::read_wav(filename, pcmf32, pcmf32s, params.diarize)) {
+            fprintf(stderr, "error: failed to read WAV file '%s'\n", filename.c_str());
+            const std::string error_resp = "{\"error\":\"failed to read WAV file\"}";
+            res.set_content(error_resp, "application/json");
+            whisper_mutex.unlock();
+            return;
+        }
+        // remove temp file
+        std::remove(filename.c_str());
+
+        printf("Successfully loaded %s\n", filename.c_str());
+
+        // print system information
+        {
+            fprintf(stderr, "\n");
+            fprintf(stderr, "system_info: n_threads = %d / %d | %s\n",
+                    params.n_threads*params.n_processors, std::thread::hardware_concurrency(), whisper_print_system_info());
+        }
+
+        // print some info about the processing
+        {
+            fprintf(stderr, "\n");
+            if (!whisper_is_multilingual(ctx)) {
+                if (params.language != "en" || params.translate) {
+                    params.language = "en";
+                    params.translate = false;
+                    fprintf(stderr, "%s: WARNING: model is not multilingual, ignoring language and translation options\n", __func__);
+                }
+            }
+            if (params.detect_language) {
+                params.language = "auto";
+            }
+            fprintf(stderr, "%s: processing '%s' (%d samples, %.1f sec), %d threads, %d processors, lang = %s, task = %s, %stimestamps = %d ...\n",
+                    __func__, filename.c_str(), int(pcmf32.size()), float(pcmf32.size())/WHISPER_SAMPLE_RATE,
+                    params.n_threads, params.n_processors,
+                    params.language.c_str(),
+                    params.translate ? "translate" : "transcribe",
+                    params.tinydiarize ? "tdrz = 1, " : "",
+                    params.no_timestamps ? 0 : 1);
+
+            fprintf(stderr, "\n");
+        }
+
+        // run the inference
+        {
+
+            printf("Running whisper.cpp inference on %s\n", filename.c_str());
+            whisper_full_params wparams = whisper_full_default_params(WHISPER_SAMPLING_GREEDY);
+
+            wparams.strategy = params.beam_size > 1 ? WHISPER_SAMPLING_BEAM_SEARCH : WHISPER_SAMPLING_GREEDY;
+
+            wparams.print_realtime   = false;
+            wparams.print_progress   = params.print_progress;
+            wparams.print_timestamps = !params.no_timestamps;
+            wparams.print_special    = params.print_special;
+            wparams.translate        = params.translate;
+            wparams.language         = params.language.c_str();
+            wparams.detect_language  = params.detect_language;
+            wparams.n_threads        = params.n_threads;
+            wparams.n_max_text_ctx   = params.max_context >= 0 ? params.max_context : wparams.n_max_text_ctx;
+            wparams.offset_ms        = params.offset_t_ms;
+            wparams.duration_ms      = params.duration_ms;
+
+            wparams.thold_pt         = params.word_thold;
+            wparams.split_on_word    = params.split_on_word;
+
+            wparams.speed_up         = params.speed_up;
+            wparams.debug_mode       = params.debug_mode;
+
+            wparams.tdrz_enable      = params.tinydiarize; // [TDRZ]
+
+            wparams.initial_prompt   = params.prompt.c_str();
+
+            wparams.greedy.best_of        = params.best_of;
+            wparams.beam_search.beam_size = params.beam_size;
+
+            wparams.temperature_inc  = params.userdef_temp;
+            wparams.entropy_thold    = params.entropy_thold;
+            wparams.logprob_thold    = params.logprob_thold;
+
+            whisper_print_user_data user_data = { &params, &pcmf32s, 0 };
+
+            // this callback is called on each new segment
+            if (!wparams.print_realtime) {
+                wparams.new_segment_callback           = whisper_print_segment_callback;
+                wparams.new_segment_callback_user_data = &user_data;
+            }
+
+            if (wparams.print_progress) {
+                wparams.progress_callback           = whisper_print_progress_callback;
+                wparams.progress_callback_user_data = &user_data;
+            }
+
+            // examples for abort mechanism
+            // in examples below, we do not abort the processing, but we could if the flag is set to true
+
+            // the callback is called before every encoder run - if it returns false, the processing is aborted
+            {
+                static bool is_aborted = false; // NOTE: this should be atomic to avoid data race
+
+                wparams.encoder_begin_callback = [](struct whisper_context * /*ctx*/, struct whisper_state * /*state*/, void * user_data) {
+                    bool is_aborted = *(bool*)user_data;
+                    return !is_aborted;
+                };
+                wparams.encoder_begin_callback_user_data = &is_aborted;
+            }
+
+            // the callback is called before every computation - if it returns true, the computation is aborted
+            {
+                static bool is_aborted = false; // NOTE: this should be atomic to avoid data race
+
+                wparams.abort_callback = [](void * user_data) {
+                    bool is_aborted = *(bool*)user_data;
+                    return is_aborted;
+                };
+                wparams.abort_callback_user_data = &is_aborted;
+            }
+
+            if (whisper_full_parallel(ctx, wparams, pcmf32.data(), pcmf32.size(), params.n_processors) != 0) {
+                fprintf(stderr, "%s: failed to process audio\n", argv[0]);
+                const std::string error_resp = "{\"error\":\"failed to process audio\"}";
+                res.set_content(error_resp, "application/json");
+                whisper_mutex.unlock();
+                return;
+            }
+        }
+
+        // return results to user
+        if (params.response_format == text_format)
+        {
+            std::string results = output_str(ctx, params, pcmf32s);
+            res.set_content(results.c_str(), "text/html");
+        }
+        // TODO add more output formats
+        else
+        {
+            std::string results = output_str(ctx, params, pcmf32s);
+            json jres = json{
+                {"text", results}
+            };
+            res.set_content(jres.dump(-1, ' ', false, json::error_handler_t::replace),
+                            "application/json");
+        }
+
+        // return whisper model mutex lock
+        whisper_mutex.unlock();
+    });
+    svr.Post("/load", [&](const Request &req, Response &res){
+        whisper_mutex.lock();
+        if (!req.has_file("model"))
+        {
+            fprintf(stderr, "error: no 'model' field in the request\n");
+            const std::string error_resp = "{\"error\":\"no 'model' field in the request\"}";
+            res.set_content(error_resp, "application/json");
+            whisper_mutex.unlock();
+            return;
+        }
+        std::string model = req.get_file_value("model").content;
+        if (!is_file_exist(model.c_str()))
+        {
+            fprintf(stderr, "error: 'model': %s not found!\n", model.c_str());
+            const std::string error_resp = "{\"error\":\"model not found!\"}";
+            res.set_content(error_resp, "application/json");
+            whisper_mutex.unlock();
+            return;
+        }
+
+        // clean up
+        whisper_free(ctx);
+
+        // whisper init
+        ctx = whisper_init_from_file_with_params(model.c_str(), cparams);
+
+        // TODO perhaps load prior model here instead of exit
+        if (ctx == nullptr) {
+            fprintf(stderr, "error: model init  failed, no model loaded must exit\n");
+            exit(1);
+        }
+
+        // initialize openvino encoder. this has no effect on whisper.cpp builds that don't have OpenVINO configured
+        whisper_ctx_init_openvino_encoder(ctx, nullptr, params.openvino_encode_device.c_str(), nullptr);
+
+        const std::string success = "Load was successful!";
+        res.set_content(success, "application/text");
+
+        // check if the model is in the file system
+        whisper_mutex.unlock();
+    });
+
+    svr.set_exception_handler([](const Request &, Response &res, std::exception_ptr ep) {
+        const char fmt[] = "500 Internal Server Error\n%s";
+        char buf[BUFSIZ];
+        try {
+            std::rethrow_exception(std::move(ep));
+        } catch (std::exception &e) {
+            snprintf(buf, sizeof(buf), fmt, e.what());
+        } catch (...) {
+            snprintf(buf, sizeof(buf), fmt, "Unknown Exception");
+        }
+        res.set_content(buf, "text/plain");
+        res.status = 500;
+    });
+
+    svr.set_error_handler([](const Request &, Response &res) {
+        if (res.status == 400) {
+            res.set_content("Invalid request", "text/plain");
+        } else if (res.status != 500) {
+            res.set_content("File Not Found", "text/plain");
+            res.status = 404;
+        }
+    });
+
+    // set timeouts and change hostname and port
+    svr.set_read_timeout(sparams.read_timeout);
+    svr.set_write_timeout(sparams.write_timeout);
+
+    if (!svr.bind_to_port(sparams.hostname, sparams.port))
+    {
+        fprintf(stderr, "\ncouldn't bind to server socket: hostname=%s port=%d\n\n",
+                sparams.hostname.c_str(), sparams.port);
+        return 1;
+    }
+
+    // Set the base directory for serving static files
+    svr.set_base_dir(sparams.public_path);
+
+    // to make it ctrl+clickable:
+    printf("\nwhisper server listening at http://%s:%d\n\n", sparams.hostname.c_str(), sparams.port);
+
+    if (!svr.listen_after_bind())
+    {
+        return 1;
+    }
+
+    whisper_print_timings(ctx);
+    whisper_free(ctx);
+
+    return 0;
+}

examples/wchess/CMakeLists.txt

@@ -0,0 +1,9 @@
+set(CMAKE_CXX_STANDARD 11)
+
+add_subdirectory(libwchess)
+
+if (EMSCRIPTEN)
+    add_subdirectory(wchess.wasm)
+else()
+    add_subdirectory(wchess.cmd)
+endif()

examples/wchess/libwchess/CMakeLists.txt

@@ -0,0 +1,19 @@
+add_library(libwchess
+    WChess.cpp
+    WChess.h
+    Chessboard.cpp
+    Chessboard.h
+)
+
+target_link_libraries(libwchess
+    PUBLIC
+    whisper
+    common
+)
+
+target_include_directories(libwchess
+    PUBLIC
+    "$<BUILD_INTERFACE:${CMAKE_CURRENT_SOURCE_DIR}>"
+)
+
+add_executable(test-chessboard test-chessboard.cpp Chessboard.cpp)

examples/wchess/libwchess/Chessboard.cpp

@@ -0,0 +1,714 @@
+#include "Chessboard.h"
+#include <vector>
+#include <algorithm>
+#include <cstring>
+#include <set>
+
+namespace {
+// remove std::string_view, c++17 -> c++11
+constexpr std::array<const char*, 64> positions = {
+    "a1", "b1", "c1", "d1", "e1", "f1", "g1", "h1",
+    "a2", "b2", "c2", "d2", "e2", "f2", "g2", "h2",
+    "a3", "b3", "c3", "d3", "e3", "f3", "g3", "h3",
+    "a4", "b4", "c4", "d4", "e4", "f4", "g4", "h4",
+    "a5", "b5", "c5", "d5", "e5", "f5", "g5", "h5",
+    "a6", "b6", "c6", "d6", "e6", "f6", "g6", "h6",
+    "a7", "b7", "c7", "d7", "e7", "f7", "g7", "h7",
+    "a8", "b8", "c8", "d8", "e8", "f8", "g8", "h8",
+};
+constexpr int INVALID_POS = positions.size();
+constexpr int R = 0; // rank index
+constexpr int F = 1; // file index
+#define POS ((c[F] - '1') * 8 + (c[R] - 'a'))
+constexpr int operator ""_P(const char * c, size_t size) {
+    return size < 2 || POS < 0 || POS > INVALID_POS ? INVALID_POS : POS;
+}
+#undef POS
+
+struct sview {
+    const char * ptr = nullptr;
+    size_t size = 0;
+
+    sview() = default;
+    sview(const char * p, size_t s) : ptr(p), size(s) {}
+    sview(const std::string& s) : ptr(s.data()), size(s.size()) {}
+
+    size_t find(char del, size_t pos) {
+        while (pos < size && ptr[pos] != del) ++pos;
+        return pos < size ? pos : std::string::npos;
+    }
+};
+
+std::vector<sview> split(sview str, char del) {
+    std::vector<sview> res;
+    size_t cur = 0;
+    size_t last = 0;
+    while (cur != std::string::npos) {
+        if (str.ptr[last] == ' ') {
+            ++last;
+            continue;
+        }
+        cur = str.find(del, last);
+        size_t len = cur == std::string::npos ? str.size - last : cur - last;
+        res.emplace_back(str.ptr + last, len);
+        last = cur + 1;
+    }
+    return res;
+}
+
+size_t strToPos(sview str) {
+    return operator ""_P(str.ptr, str.size);
+}
+
+constexpr std::array<const char*, 6> pieceNames =  {
+    "pawn", "knight", "bishop", "rook", "queen", "king",
+};
+
+int strToType(sview str) {
+    auto it = std::find_if(pieceNames.begin(), pieceNames.end(), [str] (const char* name) { return strncmp(name, str.ptr, str.size) == 0; });
+    return it != pieceNames.end() ? int(it - pieceNames.begin()) : pieceNames.size();
+}
+}
+
+Chessboard::Chessboard()
+    : blackPieces {{
+        {Piece::Pawn, Piece::Black, "a7"_P },
+        {Piece::Pawn, Piece::Black, "b7"_P },
+        {Piece::Pawn, Piece::Black, "c7"_P },
+        {Piece::Pawn, Piece::Black, "d7"_P },
+        {Piece::Pawn, Piece::Black, "e7"_P },
+        {Piece::Pawn, Piece::Black, "f7"_P },
+        {Piece::Pawn, Piece::Black, "g7"_P },
+        {Piece::Pawn, Piece::Black, "h7"_P },
+        {Piece::Rook, Piece::Black, "a8"_P },
+        {Piece::Knight, Piece::Black, "b8"_P },
+        {Piece::Bishop, Piece::Black, "c8"_P },
+        {Piece::Queen, Piece::Black, "d8"_P },
+        {Piece::King, Piece::Black, "e8"_P },
+        {Piece::Bishop, Piece::Black, "f8"_P },
+        {Piece::Knight, Piece::Black, "g8"_P },
+        {Piece::Rook, Piece::Black, "h8"_P },
+    }}
+    , whitePieces {{
+        {Piece::Pawn, Piece::White, "a2"_P },
+        {Piece::Pawn, Piece::White, "b2"_P },
+        {Piece::Pawn, Piece::White, "c2"_P },
+        {Piece::Pawn, Piece::White, "d2"_P },
+        {Piece::Pawn, Piece::White, "e2"_P },
+        {Piece::Pawn, Piece::White, "f2"_P },
+        {Piece::Pawn, Piece::White, "g2"_P },
+        {Piece::Pawn, Piece::White, "h2"_P },
+        {Piece::Rook, Piece::White, "a1"_P },
+        {Piece::Knight, Piece::White, "b1"_P },
+        {Piece::Bishop, Piece::White, "c1"_P },
+        {Piece::Queen, Piece::White, "d1"_P },
+        {Piece::King, Piece::White, "e1"_P },
+        {Piece::Bishop, Piece::White, "f1"_P },
+        {Piece::Knight, Piece::White, "g1"_P },
+        {Piece::Rook, Piece::White, "h1"_P },
+    }}
+    , board {{
+        &whitePieces[ 8], &whitePieces[ 9], &whitePieces[10], &whitePieces[11], &whitePieces[12], &whitePieces[13], &whitePieces[14], &whitePieces[15],
+        &whitePieces[ 0], &whitePieces[ 1], &whitePieces[ 2], &whitePieces[ 3], &whitePieces[ 4], &whitePieces[ 5], &whitePieces[ 6], &whitePieces[ 7],
+        nullptr,          nullptr,          nullptr,          nullptr,          nullptr,          nullptr,          nullptr,          nullptr,
+        nullptr,          nullptr,          nullptr,          nullptr,          nullptr,          nullptr,          nullptr,          nullptr,
+        nullptr,          nullptr,          nullptr,          nullptr,          nullptr,          nullptr,          nullptr,          nullptr,
+        nullptr,          nullptr,          nullptr,          nullptr,          nullptr,          nullptr,          nullptr,          nullptr,
+        &blackPieces[ 0], &blackPieces[ 1], &blackPieces[ 2], &blackPieces[ 3], &blackPieces[ 4], &blackPieces[ 5], &blackPieces[ 6], &blackPieces[ 7],
+        &blackPieces[ 8], &blackPieces[ 9], &blackPieces[10], &blackPieces[11], &blackPieces[12], &blackPieces[13], &blackPieces[14], &blackPieces[15],
+    }}
+    , whiteMoves {
+        {"b1"_P, "a3"_P}, {"b1"_P, "c3"_P},
+        {"g1"_P, "f3"_P}, {"g1"_P, "h3"_P},
+        {"a2"_P, "a3"_P}, {"a2"_P, "a4"_P},
+        {"b2"_P, "b3"_P}, {"b2"_P, "b4"_P},
+        {"c2"_P, "c3"_P}, {"c2"_P, "c4"_P},
+        {"d2"_P, "d3"_P}, {"d2"_P, "d4"_P},
+        {"e2"_P, "e3"_P}, {"e2"_P, "e4"_P},
+        {"f2"_P, "f3"_P}, {"f2"_P, "f4"_P},
+        {"g2"_P, "g3"_P}, {"g2"_P, "g4"_P},
+        {"h2"_P, "h3"_P}, {"h2"_P, "h4"_P},
+    }
+    , blackMoves {
+        {"a7"_P, "a5"_P}, {"a7"_P, "a6"_P},
+        {"b7"_P, "b5"_P}, {"b7"_P, "b6"_P},
+        {"c7"_P, "c5"_P}, {"c7"_P, "c6"_P},
+        {"d7"_P, "d5"_P}, {"d7"_P, "d6"_P},
+        {"e7"_P, "e5"_P}, {"e7"_P, "e6"_P},
+        {"f7"_P, "f5"_P}, {"f7"_P, "f6"_P},
+        {"g7"_P, "g5"_P}, {"g7"_P, "g6"_P},
+        {"h7"_P, "h5"_P}, {"h7"_P, "h6"_P},
+        {"b8"_P, "a6"_P}, {"b8"_P, "c6"_P},
+        {"g8"_P, "f6"_P}, {"g8"_P, "h6"_P},
+    }
+
+{
+    static_assert(pieceNames.size() == Chessboard::Piece::Taken, "Mismatch between piece names and types");
+    std::sort(whiteMoves.begin(), whiteMoves.end());
+    std::sort(blackMoves.begin(), blackMoves.end());
+}
+
+std::string Chessboard::getRules(const std::string& prompt) const {
+    // leading space is very important!
+    std::string result =
+    "\n"
+    "# leading space is very important!\n"
+    "\n";
+    if (prompt.empty()) {
+        result += "move ::= \" \" ((piece | frompos) \" \" \"to \"?)? topos\n";
+        //result += "move ::= \" \" frompos \" \" \"to \"? topos\n";
+    }
+    else {
+        // result += "move ::= prompt \" \" ((piece | frompos) \" \" \"to \"?)? topos\n"
+        result += "move ::= prompt \" \" frompos \" \" \"to \"? topos\n"
+        "\n"
+        "prompt ::= \" " + prompt + "\"\n";
+    }
+
+    std::set<std::string> pieces;
+    std::set<std::string> from_pos;
+    std::set<std::string> to_pos;
+    auto& allowed_moves =  m_moveCounter % 2 ? blackMoves : whiteMoves;
+    for (auto& m : allowed_moves) {
+        if (board[m.first]->type != Piece::Taken) pieces.insert(pieceNames[board[m.first]->type]);
+        from_pos.insert(positions[m.first]);
+        to_pos.insert(positions[m.second]);
+    }
+    if (!pieces.empty()) {
+        result += "piece ::= (";
+        for (auto& p : pieces) result += " \"" + p + "\" |";
+        result.pop_back();
+        result += ")\n\n";
+    }
+    if (!from_pos.empty()) {
+        result += "frompos ::= (";
+        for (auto& p : from_pos) result += " \"" + p + "\" |";
+        result.pop_back();
+        result += ")\n";
+    }
+    if (!to_pos.empty()) {
+        result += "topos ::= (";
+        for (auto& p : to_pos) result += " \"" + p + "\" |";
+        result.pop_back();
+        result += ")\n";
+    }
+
+    return result;
+}
+
+std::string Chessboard::stringifyBoard() {
+    static constexpr std::array<char, 6> blackShort =  {
+        'p', 'n', 'b', 'r', 'q', 'k',
+    };
+    static constexpr std::array<char, 6> whiteShort =  {
+        'P', 'N', 'B', 'R', 'Q', 'K',
+    };
+
+    std::string result;
+    result.reserve(16 + 2 * 64 + 16);
+    for (char rank = 'a'; rank <= 'h'; ++rank) {
+        result.push_back(rank);
+        result.push_back(' ');
+    }
+    result.back() = '\n';
+    for (int i = 7; i >= 0; --i) {
+        for (int j = 0; j < 8; ++j) {
+            auto p = board[i * 8 + j];
+            if (p) result.push_back(p->color == Piece::White ? whiteShort[p->type] : blackShort[p->type]);
+            else result.push_back((i + j) % 2 ? '.' : '*');
+            result.push_back(' ');
+        }
+        result.push_back('0' + i + 1);
+        result.push_back('\n');
+    }
+    return result;
+}
+
+std::string Chessboard::process(const std::string& command) {
+    auto color = Piece::Colors(m_moveCounter % 2);
+    fprintf(stdout, "%s: Command to %s: '%s%.*s%s'\n", __func__, (color ? "Black" : "White"), "\033[1m", int(command.size()), command.data(), "\033[0m");
+    if (command.empty()) return "";
+    auto tokens = split(command, ' ');
+    for (auto& t : tokens) fprintf(stdout, "%s: Token %.*s\n", __func__, int(t.size), t.ptr);
+    auto pos_from = INVALID_POS;
+    auto type = Piece::Types::Taken;
+    auto pos_to = INVALID_POS;
+    if (tokens.size() == 1) {
+        type = Piece::Types::Pawn;
+        pos_to = strToPos(tokens.front());
+    }
+    else {
+        pos_from = strToPos(tokens.front());
+        if (pos_from == INVALID_POS) type = Piece::Types(strToType(tokens.front()));
+        pos_to = strToPos(tokens.back());
+    }
+    if (pos_to == INVALID_POS) return "";
+    if (pos_from == INVALID_POS) {
+        if (type == Piece::Types::Taken) return "";
+        auto& pieces = color ? blackPieces : whitePieces;
+        auto pieceIndex = 0u;
+        for (; pieceIndex < pieces.size(); ++pieceIndex) {
+            if (pieces[pieceIndex].type == type && validateMove(pieces[pieceIndex], pos_to)) break;
+        }
+        if (pieceIndex == pieces.size()) return "";
+        pos_from = pieces[pieceIndex].pos;
+    }
+    if (board[pos_from] == nullptr) return "";
+    if (board[pos_from]->color != color) return "";
+
+    Move m = {pos_from, pos_to};
+    auto& allowed_moves = color ? blackMoves : whiteMoves;
+    fprintf(stdout, "%s:allowed size %d :\n", __func__, int(allowed_moves.size()));
+    for (auto& m : allowed_moves) fprintf(stdout, " %s %s; ", positions[m.first], positions[m.second]);
+    fprintf(stdout, "\n");
+    if (!std::binary_search(allowed_moves.begin(), allowed_moves.end(), m)) return "";
+
+    move(m);
+
+    {
+        auto it = std::remove_if(allowed_moves.begin(), allowed_moves.end(), [m] (const Move& move) { return move.first == m.first; });
+        allowed_moves.erase(it, allowed_moves.end());
+    }
+
+    std::vector<Piece*> affected = { board[m.second] };
+    for (auto& p : whitePieces) {
+        if (&p == board[m.second]
+            || validateMove(p, m.first)
+            || validateMove(p, m.second)
+            || std::binary_search(whiteMoves.begin(), whiteMoves.end(), Move(p.pos, m.second))
+        ) {
+            auto it = std::remove_if(whiteMoves.begin(), whiteMoves.end(), [&p] (const Move& m) { return m.first == p.pos; });
+            whiteMoves.erase(it, whiteMoves.end());
+            affected.push_back(&p);
+        }
+    }
+
+    for (auto& p : blackPieces) {
+        if (&p == board[m.second]
+            || validateMove(p, m.first)
+            || validateMove(p, m.second)
+            || std::binary_search(blackMoves.begin(), blackMoves.end(), Move(p.pos, m.second))
+        ) {
+            auto it = std::remove_if(blackMoves.begin(), blackMoves.end(), [&p] (const Move& m) { return m.first == p.pos; });
+            blackMoves.erase(it, blackMoves.end());
+            affected.push_back(&p);
+        }
+    }
+    for (auto& p : affected) getValidMoves(*p, p->color ? blackMoves : whiteMoves);
+
+    std::sort(blackMoves.begin(), blackMoves.end());
+    std::sort(whiteMoves.begin(), whiteMoves.end());
+
+    std::string result = positions[m.first];
+    result += "-";
+    result += positions[m.second];
+    ++m_moveCounter;
+    fprintf(stdout, "%s: Move '%s%s%s'\n", __func__, "\033[1m", result.data(), "\033[0m");
+    return result;
+}
+
+void Chessboard::getValidMoves(const Piece& piece, std::vector<Move>& result) {
+    std::string cur = positions[piece.pos];
+    switch (piece.type) {
+        case Piece::Pawn: {
+            std::string next = cur;
+            piece.color ? --next[F] : ++next[F]; // one down / up
+            std::string left = { char(next[R] - 1), next[F]};
+            auto pos = strToPos(left);
+            if (pos != INVALID_POS && board[pos] && board[pos]->color != piece.color) result.emplace_back(piece.pos, pos);
+            std::string right = { char(next[R] + 1), next[F]};
+            pos = strToPos(right);
+            if (pos != INVALID_POS && board[pos] && board[pos]->color != piece.color) result.emplace_back(piece.pos, pos);
+            pos = strToPos(next);
+            if (pos != INVALID_POS && !board[pos]) result.emplace_back(piece.pos, pos);
+            else break;
+            if (piece.color ? cur[F] != '7' : cur[F] != '2') break;
+            piece.color ? --next[F] : ++next[F]; // one down / up
+            pos = strToPos(next);
+            if (pos != INVALID_POS && !board[pos]) result.emplace_back(piece.pos, pos);
+            break;
+        }
+        case Piece::Knight: {
+            std::string next = cur;
+            --next[F]; --next[F]; --next[R];
+            auto pos = strToPos(next);
+            if (pos != INVALID_POS && !(board[pos] && board[pos]->color == piece.color)) result.emplace_back(piece.pos, pos);
+
+            next = cur;
+            --next[F]; --next[F]; ++next[R];
+            pos = strToPos(next);
+            if (pos != INVALID_POS && !(board[pos] && board[pos]->color == piece.color)) result.emplace_back(piece.pos, pos);
+
+            next = cur;
+            ++next[F]; ++next[F]; --next[R];
+            pos = strToPos(next);
+            if (pos != INVALID_POS && !(board[pos] && board[pos]->color == piece.color)) result.emplace_back(piece.pos, pos);
+
+            next = cur;
+            ++next[F]; ++next[F]; ++next[R];
+            pos = strToPos(next);
+            if (pos != INVALID_POS && !(board[pos] && board[pos]->color == piece.color)) result.emplace_back(piece.pos, pos);
+
+            next = cur;
+            --next[F]; --next[R]; --next[R];
+            pos = strToPos(next);
+            if (pos != INVALID_POS && !(board[pos] && board[pos]->color == piece.color)) result.emplace_back(piece.pos, pos);
+
+            next = cur;
+            ++next[F]; --next[R]; --next[R];
+            pos = strToPos(next);
+            if (pos != INVALID_POS && !(board[pos] && board[pos]->color == piece.color)) result.emplace_back(piece.pos, pos);
+
+            next = cur;
+            --next[F]; ++next[R]; ++next[R];
+            pos = strToPos(next);
+            if (pos != INVALID_POS && !(board[pos] && board[pos]->color == piece.color)) result.emplace_back(piece.pos, pos);
+
+            next = cur;
+            ++next[F]; ++next[R]; ++next[R];
+            pos = strToPos(next);
+            if (pos != INVALID_POS && !(board[pos] && board[pos]->color == piece.color)) result.emplace_back(piece.pos, pos);
+            break;
+        }
+        case Piece::Bishop: {
+            std::string next = cur;
+            while (true) {
+                --next[R]; --next[F];
+                auto pos = strToPos(next);
+                if (pos == INVALID_POS) break;
+                else if (board[pos]) {
+                    if (board[pos]->color != piece.color) result.emplace_back(piece.pos, pos);
+                    break;
+                }
+                result.emplace_back(piece.pos, pos);
+            }
+            next = cur;
+            while (true) {
+                --next[R]; ++next[F];
+                auto pos = strToPos(next);
+                if (pos == INVALID_POS) break;
+                else if (board[pos]) {
+                    if (board[pos]->color != piece.color) result.emplace_back(piece.pos, pos);
+                    break;
+                }
+                result.emplace_back(piece.pos, pos);
+            }
+            next = cur;
+            while (true) {
+                ++next[R]; --next[F];
+                auto pos = strToPos(next);
+                if (pos == INVALID_POS) break;
+                else if (board[pos]) {
+                    if (board[pos]->color != piece.color) result.emplace_back(piece.pos, pos);
+                    break;
+                }
+                result.emplace_back(piece.pos, pos);
+            }
+            next = cur;
+            while (true) {
+                ++next[R]; ++next[F];
+                auto pos = strToPos(next);
+                if (pos == INVALID_POS) break;
+                else if (board[pos]) {
+                    if (board[pos]->color != piece.color) result.emplace_back(piece.pos, pos);
+                    break;
+                }
+                result.emplace_back(piece.pos, pos);
+            }
+            break;
+        }
+        case Piece::Rook: {
+            std::string next = cur;
+            while (true) {
+                --next[R];
+                auto pos = strToPos(next);
+                if (pos == INVALID_POS) break;
+                else if (board[pos]) {
+                    if (board[pos]->color != piece.color) result.emplace_back(piece.pos, pos);
+                    break;
+                }
+                result.emplace_back(piece.pos, pos);
+            }
+            next = cur;
+            while (true) {
+                ++next[R];
+                auto pos = strToPos(next);
+                if (pos == INVALID_POS) break;
+                else if (board[pos]) {
+                    if (board[pos]->color != piece.color) result.emplace_back(piece.pos, pos);
+                    break;
+                }
+                result.emplace_back(piece.pos, pos);
+            }
+            next = cur;
+            while (true) {
+                --next[F];
+                auto pos = strToPos(next);
+                if (pos == INVALID_POS) break;
+                else if (board[pos]) {
+                    if (board[pos]->color != piece.color) result.emplace_back(piece.pos, pos);
+                    break;
+                }
+                result.emplace_back(piece.pos, pos);
+            }
+            next = cur;
+            while (true) {
+                ++next[F];
+                auto pos = strToPos(next);
+                if (pos == INVALID_POS) break;
+                else if (board[pos]) {
+                    if (board[pos]->color != piece.color) result.emplace_back(piece.pos, pos);
+                    break;
+                }
+                result.emplace_back(piece.pos, pos);
+            }
+            break;
+        }
+        case Piece::Queen: {
+            std::string next = cur;
+            while (true) {
+                --next[R]; --next[F];
+                auto pos = strToPos(next);
+                if (pos == INVALID_POS) break;
+                else if (board[pos]) {
+                    if (board[pos]->color != piece.color) result.emplace_back(piece.pos, pos);
+                    break;
+                }
+                result.emplace_back(piece.pos, pos);
+            }
+            next = cur;
+            while (true) {
+                --next[R]; ++next[F];
+                auto pos = strToPos(next);
+                if (pos == INVALID_POS) break;
+                else if (board[pos]) {
+                    if (board[pos]->color != piece.color) result.emplace_back(piece.pos, pos);
+                    break;
+                }
+                result.emplace_back(piece.pos, pos);
+            }
+            next = cur;
+            while (true) {
+                ++next[R]; --next[F];
+                auto pos = strToPos(next);
+                if (pos == INVALID_POS) break;
+                else if (board[pos]) {
+                    if (board[pos]->color != piece.color) result.emplace_back(piece.pos, pos);
+                    break;
+                }
+                result.emplace_back(piece.pos, pos);
+            }
+            next = cur;
+            while (true) {
+                ++next[R]; ++next[F];
+                auto pos = strToPos(next);
+                if (pos == INVALID_POS) break;
+                else if (board[pos]) {
+                    if (board[pos]->color != piece.color) result.emplace_back(piece.pos, pos);
+                    break;
+                }
+                result.emplace_back(piece.pos, pos);
+            }
+            next = cur;
+            while (true) {
+                --next[R];
+                auto pos = strToPos(next);
+                if (pos == INVALID_POS) break;
+                else if (board[pos]) {
+                    if (board[pos]->color != piece.color) result.emplace_back(piece.pos, pos);
+                    break;
+                }
+                result.emplace_back(piece.pos, pos);
+            }
+            next = cur;
+            while (true) {
+                ++next[R];
+                auto pos = strToPos(next);
+                if (pos == INVALID_POS) break;
+                else if (board[pos]) {
+                    if (board[pos]->color != piece.color) result.emplace_back(piece.pos, pos);
+                    break;
+                }
+                result.emplace_back(piece.pos, pos);
+            }
+            next = cur;
+            while (true) {
+                --next[F];
+                auto pos = strToPos(next);
+                if (pos == INVALID_POS) break;
+                else if (board[pos]) {
+                    if (board[pos]->color != piece.color) result.emplace_back(piece.pos, pos);
+                    break;
+                }
+                result.emplace_back(piece.pos, pos);
+            }
+            next = cur;
+            while (true) {
+                ++next[F];
+                auto pos = strToPos(next);
+                if (pos == INVALID_POS) break;
+                else if (board[pos]) {
+                    if (board[pos]->color != piece.color) result.emplace_back(piece.pos, pos);
+                    break;
+                }
+                result.emplace_back(piece.pos, pos);
+            }
+            break;
+        }
+        case Piece::King: {
+            std::string next = cur;
+            --next[R]; --next[F];
+            auto pos = strToPos(next);
+            if (pos != INVALID_POS && !(board[pos] && board[pos]->color == piece.color)) result.emplace_back(piece.pos, pos);
+
+            next = cur;
+            --next[R]; ++next[F];
+            pos = strToPos(next);
+            if (pos != INVALID_POS && !(board[pos] && board[pos]->color == piece.color)) result.emplace_back(piece.pos, pos);
+
+            next = cur;
+            ++next[R]; --next[F];
+            pos = strToPos(next);
+            if (pos != INVALID_POS && !(board[pos] && board[pos]->color == piece.color)) result.emplace_back(piece.pos, pos);
+
+            next = cur;
+            ++next[R]; ++next[F];
+            pos = strToPos(next);
+            if (pos != INVALID_POS && !(board[pos] && board[pos]->color == piece.color)) result.emplace_back(piece.pos, pos);
+
+            next = cur;
+            --next[R];
+            pos = strToPos(next);
+            if (pos != INVALID_POS && !(board[pos] && board[pos]->color == piece.color)) result.emplace_back(piece.pos, pos);
+
+            next = cur;
+            ++next[R];
+            pos = strToPos(next);
+            if (pos != INVALID_POS && !(board[pos] && board[pos]->color == piece.color)) result.emplace_back(piece.pos, pos);
+
+            next = cur;
+            --next[F];
+            pos = strToPos(next);
+            if (pos != INVALID_POS && !(board[pos] && board[pos]->color == piece.color)) result.emplace_back(piece.pos, pos);
+
+            next = cur;
+            ++next[F];
+            pos = strToPos(next);
+            if (pos != INVALID_POS && !(board[pos] && board[pos]->color == piece.color)) result.emplace_back(piece.pos, pos);
+
+            break;
+        }
+        case Piece::Taken: break;
+        default: break;
+    }
+}
+
+bool Chessboard::validatePawnMove(Piece::Colors color, int from_rank, int from_file, int to_rank, int to_file) {
+    int direction = color == Piece::White ? 1 : -1;
+    bool two_ranks = color == Piece::White ? from_rank == 1 : from_rank == 6;
+    if (from_file == to_file) {
+        if (from_rank == to_rank - direction) return board[to_rank * 8 + to_file] == nullptr;
+        if (two_ranks && from_rank == to_rank - direction * 2) return board[(to_rank - direction) * 8 + to_file] == nullptr && board[to_rank * 8 + to_file] == nullptr;
+    }
+    else if (from_file + 1 == to_file || from_file - 1 == to_file) {
+        if (from_rank == to_rank - direction) return board[to_rank * 8 + to_file] != nullptr && board[to_rank * 8 + to_file]->color != color;
+    }
+    return false;
+}
+
+bool Chessboard::validateKnightMove(Piece::Colors color, int from_rank, int from_file, int to_rank, int to_file) {
+    int dr = std::abs(from_rank - to_rank);
+    int df = std::abs(from_file - to_file);
+    if ((dr == 2 && df == 1) || (dr == 1 && df == 2)) return board[to_rank * 8 + to_file] == nullptr || board[to_rank * 8 + to_file]->color != color;
+    return false;
+}
+
+bool Chessboard::validateBishopMove(Piece::Colors color, int from_rank, int from_file, int to_rank, int to_file) {
+    if (from_rank - from_file == to_rank - to_file) {
+        int direction = from_rank < to_rank ? 1 : -1;
+        from_rank += direction;
+        from_file += direction;
+        while (from_rank != to_rank) {
+            if (board[from_rank * 8 + from_file]) return false;
+            from_rank += direction;
+            from_file += direction;
+        }
+        return board[to_rank * 8 + to_file] == nullptr || board[to_rank * 8 + to_file]->color != color;
+    }
+    if (from_rank + from_file == to_rank + to_file) {
+        int direction = from_rank < to_rank ? 1 : -1;
+        from_rank += direction;
+        from_file -= direction;
+        while (from_rank != to_rank) {
+            if (board[from_rank * 8 + from_file]) return false;
+            from_rank += direction;
+            from_file -= direction;
+        }
+        return board[to_rank * 8 + to_file] == nullptr || board[to_rank * 8 + to_file]->color != color;
+    }
+    return false;
+}
+
+bool Chessboard::validateRookMove(Piece::Colors color, int from_rank, int from_file, int to_rank, int to_file) {
+    if (from_rank == to_rank) {
+        int direction = from_file < to_file ? 1 : -1;
+        from_file += direction;
+        while (from_file != to_file) {
+            if (board[from_rank * 8 + from_file]) return false;
+            from_file += direction;
+        }
+        return board[to_rank * 8 + to_file] == nullptr || board[to_rank * 8 + to_file]->color != color;
+    }
+    if (from_file == to_file) {
+        int direction = from_rank < to_rank ? 1 : -1;
+        from_rank += direction;
+        while (from_rank != to_rank) {
+            if (board[from_rank * 8 + from_file]) return false;
+            from_rank += direction;
+        }
+        return board[to_rank * 8 + to_file] == nullptr || board[to_rank * 8 + to_file]->color != color;
+    }
+    return false;
+}
+
+bool Chessboard::validateQueenMove(Piece::Colors color, int from_rank, int from_file, int to_rank, int to_file) {
+    if (validateBishopMove(color, from_rank, from_file, to_rank, to_file)) return true;
+    return validateRookMove(color, from_rank, from_file, to_rank, to_file);
+}
+
+bool Chessboard::validateKingMove(Piece::Colors color, int from_rank, int from_file, int to_rank, int to_file) {
+    if (std::abs(from_rank - to_rank) < 2 && std::abs(from_file - to_file) < 2) {
+        return board[to_rank * 8 + to_file] == nullptr || board[to_rank * 8 + to_file]->color != color;
+    }
+    return false;
+}
+
+bool Chessboard::validateMove(const Piece& piece, int pos) {
+    if (piece.type == Piece::Taken) return false;
+    if (piece.pos == pos) return false;
+    int i = piece.pos / 8;
+    int j = piece.pos - i * 8;
+
+    int ii = pos / 8;
+    int jj = pos - ii * 8;
+
+    switch (piece.type) {
+        case Piece::Pawn: return validatePawnMove(piece.color, i, j, ii, jj);
+        case Piece::Knight: return validateKnightMove(piece.color, i, j, ii, jj);
+        case Piece::Bishop: return validateBishopMove(piece.color, i, j, ii, jj);
+        case Piece::Rook: return validateRookMove(piece.color, i, j, ii, jj);
+        case Piece::Queen: return validateQueenMove(piece.color, i, j, ii, jj);
+        case Piece::King: return validateKingMove(piece.color, i, j, ii, jj);
+        default: break;
+    }
+    return false;
+}
+
+bool Chessboard::move(const Move& m) {
+    if (!board[m.first] || (board[m.second] && board[m.first]->color == board[m.second]->color)) return false;
+    if (board[m.second]) board[m.second]->type = Piece::Taken;
+    board[m.second] = board[m.first];
+    board[m.first] = nullptr;
+    board[m.second]->pos = m.second;
+    return true;
+}

examples/wchess/libwchess/Chessboard.h

@@ -0,0 +1,59 @@
+#pragma once
+#include <string>
+#include <array>
+#include <vector>
+
+class Chessboard {
+public:
+    Chessboard();
+    std::string process(const std::string& t);
+    std::string stringifyBoard();
+    std::string getRules(const std::string & prompt) const;
+    using Move = std::pair<int, int>;
+private:
+    bool move(const Move& move);
+
+    struct Piece {
+        enum Types {
+            Pawn,
+            Knight,
+            Bishop,
+            Rook,
+            Queen,
+            King,
+            Taken,
+        };
+
+        enum Colors {
+            White,
+            Black,
+        };
+
+        Types type;
+        Colors color;
+        int pos;
+    };
+
+    using PieceSet = std::array<Piece, 16>;
+
+    PieceSet blackPieces;
+    PieceSet whitePieces;
+    int m_moveCounter = 0;
+
+    using Board = std::array<Piece*, 64>;
+    Board board;
+
+    std::vector<Move> whiteMoves;
+    std::vector<Move> blackMoves;
+
+    bool validateMove(const Piece& piece, int pos);
+    void getValidMoves(const Piece& piece, std::vector<Move>& moves);
+    // just basic validation
+    // fixme: missing en passant, castling, promotion, etc.
+    bool validatePawnMove(Piece::Colors color, int from_rank, int from_file, int to_rank, int to_file);
+    bool validateKnightMove(Piece::Colors color, int from_rank, int from_file, int to_rank, int to_file);
+    bool validateBishopMove(Piece::Colors color, int from_rank, int from_file, int to_rank, int to_file);
+    bool validateRookMove(Piece::Colors color, int from_rank, int from_file, int to_rank, int to_file);
+    bool validateQueenMove(Piece::Colors color, int from_rank, int from_file, int to_rank, int to_file);
+    bool validateKingMove(Piece::Colors color, int from_rank, int from_file, int to_rank, int to_file);
+};

examples/wchess/libwchess/WChess.cpp

@@ -0,0 +1,220 @@
+#include "WChess.h"
+#include "Chessboard.h"
+#include "grammar-parser.h"
+#include "common.h"
+#include <thread>
+
+WChess::WChess(whisper_context * ctx,
+        const whisper_full_params & wparams,
+        callbacks cb,
+        settings s)
+        : m_ctx(ctx)
+        , m_wparams(wparams)
+        , m_cb(cb)
+        , m_settings(s)
+        , m_board(new Chessboard())
+{}
+
+WChess::~WChess() = default;
+
+void WChess::set_status(const std::string& msg) const {
+    if (m_cb.set_status) (*m_cb.set_status)(msg);
+}
+
+void WChess::set_moves(const std::string& moves) const {
+    if (m_cb.set_moves) (*m_cb.set_moves)(moves);
+}
+
+bool WChess::check_running() const {
+    if (m_cb.check_running) return (*m_cb.check_running)();
+    return false;
+}
+
+void WChess::clear_audio() const {
+    if (m_cb.clear_audio) (*m_cb.clear_audio)();
+}
+
+void WChess::get_audio(int ms, std::vector<float>& pcmf32) const {
+    if (m_cb.get_audio) (*m_cb.get_audio)(ms, pcmf32);
+}
+
+std::string WChess::stringify_board() const {
+    return m_board->stringifyBoard();
+}
+
+void WChess::run() {
+    set_status("loading data ...");
+
+    bool have_prompt  = true;
+    bool ask_prompt   = !have_prompt;
+
+    float logprob_min0 = 0.0f;
+    float logprob_min  = 0.0f;
+
+    float logprob_sum0 = 0.0f;
+    float logprob_sum  = 0.0f;
+
+    int n_tokens0 = 0;
+    int n_tokens  = 0;
+
+    std::vector<float> pcmf32_cur;
+    std::vector<float> pcmf32_prompt;
+
+    const std::string k_prompt = have_prompt ? "" : "checkmate";
+
+    while (check_running()) {
+        // delay
+        std::this_thread::sleep_for(std::chrono::milliseconds(100));
+
+        if (ask_prompt) {
+            fprintf(stdout, "\n");
+            fprintf(stdout, "%s: Say the following phrase: '%s%s%s'\n", __func__, "\033[1m", k_prompt.c_str(), "\033[0m");
+            fprintf(stdout, "\n");
+
+            {
+                char txt[1024];
+                snprintf(txt, sizeof(txt), "Say the following phrase: '%s'", k_prompt.c_str());
+                set_status(txt);
+            }
+
+            ask_prompt = false;
+        }
+
+        int64_t t_ms = 0;
+
+        {
+            get_audio(m_settings.vad_ms, pcmf32_cur);
+
+            if (!pcmf32_cur.empty()) {
+                fprintf(stdout, "%s: Processing ...\n", __func__);
+                set_status("Processing ...");
+
+                if (!have_prompt) {
+                    const auto txt = ::trim(transcribe(pcmf32_cur, logprob_min, logprob_sum, n_tokens, t_ms));
+
+                    fprintf(stdout, "%s: Heard '%s%s%s', (t = %d ms)\n", __func__, "\033[1m", txt.c_str(), "\033[0m", (int) t_ms);
+
+                    const float sim = similarity(txt, k_prompt);
+
+                    if (txt.length() < 0.8*k_prompt.length() || txt.length() > 1.2*k_prompt.length() || sim < 0.8f) {
+                        fprintf(stdout, "%s: WARNING: prompt not recognized, try again\n", __func__);
+                        ask_prompt = true;
+                    } else {
+                        fprintf(stdout, "\n");
+                        fprintf(stdout, "%s: The prompt has been recognized!\n", __func__);
+                        fprintf(stdout, "%s: Waiting for voice commands ...\n", __func__);
+                        fprintf(stdout, "\n");
+
+                        {
+                            char txt[1024];
+                            snprintf(txt, sizeof(txt), "Success! Waiting for voice commands ...");
+                            set_status(txt);
+                        }
+
+                        // save the audio for the prompt
+                        pcmf32_prompt = pcmf32_cur;
+                        have_prompt = true;
+                    }
+                } else {
+                    if (!pcmf32_prompt.empty()) pcmf32_cur.insert(pcmf32_cur.begin(), pcmf32_prompt.begin(), pcmf32_prompt.end());
+                    static const size_t MIN_SIZE = 1.2 * WHISPER_SAMPLE_RATE;
+                    if (MIN_SIZE > pcmf32_cur.size()) pcmf32_cur.insert(pcmf32_cur.begin(), MIN_SIZE - pcmf32_cur.size(), 0.0f);
+
+                    std::string rules = m_board->getRules(k_prompt);
+                    fprintf(stdout, "%s: grammar rules:\n'%s'\n", __func__, rules.c_str());
+
+                    auto grammar_parsed = grammar_parser::parse(rules.c_str());
+                    auto grammar_rules = grammar_parsed.c_rules();
+
+                    m_wparams.grammar_rules   = grammar_rules.data();
+                    m_wparams.n_grammar_rules = grammar_rules.size();
+
+                    m_wparams.i_start_rule    = grammar_parsed.symbol_ids.at("move");
+                    auto txt = ::trim(transcribe(pcmf32_cur, logprob_min, logprob_sum, n_tokens, t_ms));
+
+                    const float p = 100.0f * std::exp(logprob_min);
+
+                    fprintf(stdout, "%s: heard '%s'\n", __func__, txt.c_str());
+
+                    // find the prompt in the text
+                    float best_sim = 0.0f;
+                    size_t best_len = 0;
+                    for (int n = 0.8*k_prompt.size(); n <= 1.2*k_prompt.size(); ++n) {
+                        const auto prompt = txt.substr(0, n);
+
+                        const float sim = similarity(prompt, k_prompt);
+
+                        //fprintf(stderr, "%s: prompt = '%s', sim = %f\n", __func__, prompt.c_str(), sim);
+
+                        if (sim > best_sim) {
+                            best_sim = sim;
+                            best_len = n;
+                        }
+                    }
+
+                    fprintf(stdout, "%s:   DEBUG: txt = '%s', prob = %.2f%%\n", __func__, txt.c_str(), p);
+                    std::string command = ::trim(txt.substr(best_len));
+
+                    fprintf(stdout, "%s: Command '%s%s%s', (t = %d ms)\n", __func__, "\033[1m", command.c_str(), "\033[0m", (int) t_ms);
+                    fprintf(stdout, "\n");
+
+                    {
+                        char txt[1024];
+                        snprintf(txt, sizeof(txt), "Command '%s', (t = %d ms)", command.c_str(), (int) t_ms);
+                        set_status(txt);
+                    }
+                    if (!command.empty()) {
+                        auto move = m_board->process(command);
+                        if (!move.empty()) {
+                            set_moves(std::move(move));
+                        }
+                    }
+                }
+
+                clear_audio();
+            }
+        }
+    }
+}
+
+std::string WChess::transcribe(
+                const std::vector<float> & pcmf32,
+                float & logprob_min,
+                float & logprob_sum,
+                int & n_tokens,
+                int64_t & t_ms) {
+    const auto t_start = std::chrono::high_resolution_clock::now();
+
+    logprob_min = 0.0f;
+    logprob_sum = 0.0f;
+    n_tokens    = 0;
+    t_ms = 0;
+
+    if (whisper_full(m_ctx, m_wparams, pcmf32.data(), pcmf32.size()) != 0) {
+        return {};
+    }
+
+    std::string result;
+
+    const int n_segments = whisper_full_n_segments(m_ctx);
+    for (int i = 0; i < n_segments; ++i) {
+        const char * text = whisper_full_get_segment_text(m_ctx, i);
+
+        result += text;
+
+        const int n = whisper_full_n_tokens(m_ctx, i);
+        for (int j = 0; j < n; ++j) {
+            const auto token = whisper_full_get_token_data(m_ctx, i, j);
+
+            if(token.plog > 0.0f) return {};
+            logprob_min = std::min(logprob_min, token.plog);
+            logprob_sum += token.plog;
+            ++n_tokens;
+        }
+    }
+
+    const auto t_end = std::chrono::high_resolution_clock::now();
+    t_ms = std::chrono::duration_cast<std::chrono::milliseconds>(t_end - t_start).count();
+
+    return result;
+}

examples/wchess/libwchess/WChess.h

@@ -0,0 +1,62 @@
+#pragma once
+#include "whisper.h"
+#include <string>
+#include <vector>
+#include <memory>
+
+class Chessboard;
+
+class WChess {
+public:
+    using SetStatusCb = void (*)(const std::string &);
+    using CheckRunningCb = bool (*)();
+    using GetAudioCb = void (*)(int, std::vector<float> &);
+    using SetMovesCb = void (*)(const std::string &);
+    using ClearAudioCb = void (*)();
+
+    struct callbacks {
+        SetStatusCb set_status = nullptr;
+        CheckRunningCb check_running = nullptr;
+        GetAudioCb get_audio = nullptr;
+        SetMovesCb set_moves = nullptr;
+        ClearAudioCb clear_audio = nullptr;
+    };
+
+    struct settings {
+        int32_t vad_ms     = 2000;
+        int32_t prompt_ms  = 5000;
+        int32_t command_ms = 4000;
+        float vad_thold    = 0.2f;
+        float freq_thold   = 100.0f;
+        bool print_energy  = false;
+    };
+
+    WChess(
+        whisper_context * ctx,
+        const whisper_full_params & wparams,
+        callbacks cb,
+        settings s
+    );
+    ~WChess();
+
+    void run();
+    std::string stringify_board() const;
+private:
+    void get_audio(int ms, std::vector<float>& pcmf32) const;
+    void set_status(const std::string& msg) const;
+    void set_moves(const std::string& moves) const;
+    bool check_running() const;
+    void clear_audio() const;
+    std::string transcribe(
+                    const std::vector<float> & pcmf32,
+                    float & logprob_min,
+                    float & logprob_sum,
+                    int & n_tokens,
+                    int64_t & t_ms);
+
+    whisper_context * m_ctx;
+    whisper_full_params m_wparams;
+    const callbacks m_cb;
+    const settings m_settings;
+    std::unique_ptr<Chessboard> m_board;
+};

examples/wchess/libwchess/test-chessboard.cpp

@@ -0,0 +1,88 @@
+#include "Chessboard.h"
+
+#define ASSERT(x) \
+    do { \
+        if (!(x)) { \
+            fprintf(stderr, "ASSERT: %s:%d: %s\n", __FILE__, __LINE__, #x); \
+            fflush(stderr); \
+            exit(1); \
+        } \
+    } while (0)
+
+
+int main() {
+
+    {
+        // pawns
+        Chessboard chess;
+
+        ASSERT(chess.process("pawn to d4, e5, e3, pawn to d5") == "d2-d4 e7-e5 e2-e3 d7-d5");
+        ASSERT(chess.process("pawn to d4") == ""); // wrong
+        ASSERT(chess.process("pawn to c5") == ""); // wrong
+        ASSERT(chess.process("pawn to d5") == ""); // wrong
+        ASSERT(chess.process("pawn to d3") == ""); // wrong
+        ASSERT(chess.process("pawn to f5") == ""); // wrong, white's turn
+        ASSERT(chess.process("h4") == "h2-h4");
+        ASSERT(chess.process("d4") == "e5-d4");
+        ASSERT(chess.process("e4") == "e3-e4");
+        ASSERT(chess.process("d4") == ""); // wrong
+        ASSERT(chess.process("e4") == "d5-e4");
+    }
+
+    {
+        // rook
+        Chessboard chess;
+
+        ASSERT(chess.process("rook to a3") == ""); // wrong
+        ASSERT(chess.process("a4, h5, rook to a3, rook to h6") == "a2-a4 h7-h5 a1-a3 h8-h6");
+        ASSERT(chess.process("rook to d3, rook to e6") == "a3-d3 h6-e6");
+        ASSERT(chess.process("rook to d4, rook to e5") == "d3-d4 e6-e5");
+        ASSERT(chess.process("rook to a4") == ""); // wrong
+        ASSERT(chess.process("rook to d8") == ""); // wrong
+        ASSERT(chess.process("rook to d3") == "d4-d3");
+        ASSERT(chess.process("rook to e2") == "e5-e2");
+    }
+
+    {
+        // knight
+        Chessboard chess;
+
+        ASSERT(chess.process("knight to c3, knight to c6") == "b1-c3 b8-c6");
+        ASSERT(chess.process("knight to c3") == ""); // wrong
+        ASSERT(chess.process("knight to a2") == ""); // wrong
+        ASSERT(chess.process("knight to b4") == ""); // wrong, white's turn
+        ASSERT(chess.process("knight to b5") == "c3-b5");
+        ASSERT(chess.process("knight to a5") == "c6-a5");
+        ASSERT(chess.process("knight to c7") == "b5-c7");
+    }
+
+    {
+        // bishop
+        Chessboard chess;
+
+        ASSERT(chess.process("b3, b6, bishop to b2, bishop to b7") == "b2-b3 b7-b6 c1-b2 c8-b7");
+        ASSERT(chess.process("bishop to a1") == ""); // wrong
+        ASSERT(chess.process("bishop to h8") == ""); // wrong
+        ASSERT(chess.process("bishop to a6") == ""); // wrong, white's turn
+        ASSERT(chess.process("bishop to g7") == "b2-g7");
+    }
+
+    {
+        // queen
+        Chessboard chess;
+        ASSERT(chess.process("queen to d8") == ""); // wrong
+        ASSERT(chess.process("queen to f1") == ""); // wrong
+        ASSERT(chess.process("queen to h5") == ""); // wrong
+        ASSERT(chess.process("e3, d5, queen to h5, queen to d6") == "e2-e3 d7-d5 d1-h5 d8-d6");
+        ASSERT(chess.process("queen to c5") == ""); // wrong, white's turn
+        ASSERT(chess.process("queen to f7") == "h5-f7");
+    }
+
+    {
+        // king
+        Chessboard chess;
+        ASSERT(chess.process("d3, d6, king to d2, king to d7, king to c3, king to c6, king to c4") == "d2-d3 d7-d6 e1-d2 e8-d7 d2-c3 d7-c6 c3-c4");
+        ASSERT(chess.process("bishop to e6") == "c8-e6");
+        ASSERT(chess.process("king to b3") == "c4-b3"); // !! check check not implemented
+    }
+}

examples/wchess/wchess.cmd/CMakeLists.txt

@@ -0,0 +1,8 @@
+if (WHISPER_SDL2)
+    set(TARGET wchess)
+    add_executable(${TARGET} wchess.cmd.cpp)
+
+    include(DefaultTargetOptions)
+
+    target_link_libraries(${TARGET} PRIVATE libwchess common-sdl ${CMAKE_THREAD_LIBS_INIT})
+endif ()

examples/wchess/wchess.cmd/wchess.cmd.cpp

@@ -0,0 +1,207 @@
+// Command line voice assisted chess
+//
+// Speak chess move commands to the microphone.
+// The moves will translated to chessboard positions.
+//
+//
+
+#include "WChess.h"
+#include "common-sdl.h"
+
+#include <memory>
+#include <thread>
+
+// command-line parameters
+struct whisper_params {
+    int32_t n_threads  = std::min(4, (int32_t) std::thread::hardware_concurrency());
+    int32_t prompt_ms  = 5000;
+    int32_t command_ms = 8000;
+    int32_t capture_id = -1;
+    int32_t max_tokens = 32;
+    int32_t audio_ctx  = 0;
+
+    float vad_thold  = 0.6f;
+    float freq_thold = 100.0f;
+
+    float grammar_penalty = 100.0f;
+
+    bool speed_up      = false;
+    bool translate     = false;
+    bool print_special = false;
+    bool print_energy  = false;
+    bool no_timestamps = true;
+    bool use_gpu       = true;
+
+    std::string language  = "en";
+    std::string model     = "models/ggml-base.en.bin";
+    std::string fname_out;
+    std::string commands;
+    std::string prompt;
+    std::string context;
+    std::string grammar;
+};
+
+void whisper_print_usage(int /*argc*/, char ** argv, const whisper_params & params) {
+    fprintf(stderr, "\n");
+    fprintf(stderr, "usage: %s [options]\n", argv[0]);
+    fprintf(stderr, "\n");
+    fprintf(stderr, "options:\n");
+    fprintf(stderr, "  -h,         --help           [default] show this help message and exit\n");
+    fprintf(stderr, "  -t N,       --threads N      [%-7d] number of threads to use during computation\n", params.n_threads);
+    fprintf(stderr, "  -pms N,     --prompt-ms N    [%-7d] prompt duration in milliseconds\n",             params.prompt_ms);
+    fprintf(stderr, "  -cms N,     --command-ms N   [%-7d] command duration in milliseconds\n",            params.command_ms);
+    fprintf(stderr, "  -c ID,      --capture ID     [%-7d] capture device ID\n",                           params.capture_id);
+    fprintf(stderr, "  -mt N,      --max-tokens N   [%-7d] maximum number of tokens per audio chunk\n",    params.max_tokens);
+    fprintf(stderr, "  -ac N,      --audio-ctx N    [%-7d] audio context size (0 - all)\n",                params.audio_ctx);
+    fprintf(stderr, "  -vth N,     --vad-thold N    [%-7.2f] voice activity detection threshold\n",        params.vad_thold);
+    fprintf(stderr, "  -fth N,     --freq-thold N   [%-7.2f] high-pass frequency cutoff\n",                params.freq_thold);
+    fprintf(stderr, "  -su,        --speed-up       [%-7s] speed up audio by x2 (reduced accuracy)\n",     params.speed_up ? "true" : "false");
+    fprintf(stderr, "  -tr,        --translate      [%-7s] translate from source language to english\n",   params.translate ? "true" : "false");
+    fprintf(stderr, "  -ps,        --print-special  [%-7s] print special tokens\n",                        params.print_special ? "true" : "false");
+    fprintf(stderr, "  -pe,        --print-energy   [%-7s] print sound energy (for debugging)\n",          params.print_energy ? "true" : "false");
+    fprintf(stderr, "  -ng,        --no-gpu         [%-7s] disable GPU\n",                                 params.use_gpu ? "false" : "true");
+    fprintf(stderr, "  -l LANG,    --language LANG  [%-7s] spoken language\n",                             params.language.c_str());
+    fprintf(stderr, "  -m FNAME,   --model FNAME    [%-7s] model path\n",                                  params.model.c_str());
+    fprintf(stderr, "  -f FNAME,   --file FNAME     [%-7s] text output file name\n",                       params.fname_out.c_str());
+    fprintf(stderr, "  -cmd FNAME, --commands FNAME [%-7s] text file with allowed commands\n",             params.commands.c_str());
+    fprintf(stderr, "  -p,         --prompt         [%-7s] the required activation prompt\n",              params.prompt.c_str());
+    fprintf(stderr, "  -ctx,       --context        [%-7s] sample text to help the transcription\n",       params.context.c_str());
+    fprintf(stderr, "  --grammar-penalty N          [%-7.1f] scales down logits of nongrammar tokens\n",   params.grammar_penalty);
+    fprintf(stderr, "\n");
+}
+
+bool whisper_params_parse(int argc, char ** argv, whisper_params & params) {
+    for (int i = 1; i < argc; i++) {
+        std::string arg = argv[i];
+
+        if (arg == "-h" || arg == "--help") {
+            whisper_print_usage(argc, argv, params);
+            exit(0);
+        }
+        else if (arg == "-t"   || arg == "--threads")       { params.n_threads     = std::stoi(argv[++i]); }
+        else if (arg == "-pms" || arg == "--prompt-ms")     { params.prompt_ms     = std::stoi(argv[++i]); }
+        else if (arg == "-cms" || arg == "--command-ms")    { params.command_ms    = std::stoi(argv[++i]); }
+        else if (arg == "-c"   || arg == "--capture")       { params.capture_id    = std::stoi(argv[++i]); }
+        else if (arg == "-mt"  || arg == "--max-tokens")    { params.max_tokens    = std::stoi(argv[++i]); }
+        else if (arg == "-ac"  || arg == "--audio-ctx")     { params.audio_ctx     = std::stoi(argv[++i]); }
+        else if (arg == "-vth" || arg == "--vad-thold")     { params.vad_thold     = std::stof(argv[++i]); }
+        else if (arg == "-fth" || arg == "--freq-thold")    { params.freq_thold    = std::stof(argv[++i]); }
+        else if (arg == "-su"  || arg == "--speed-up")      { params.speed_up      = true; }
+        else if (arg == "-tr"  || arg == "--translate")     { params.translate     = true; }
+        else if (arg == "-ps"  || arg == "--print-special") { params.print_special = true; }
+        else if (arg == "-pe"  || arg == "--print-energy")  { params.print_energy  = true; }
+        else if (arg == "-ng"  || arg == "--no-gpu")        { params.use_gpu       = false; }
+        else if (arg == "-l"   || arg == "--language")      { params.language      = argv[++i]; }
+        else if (arg == "-m"   || arg == "--model")         { params.model         = argv[++i]; }
+        else if (arg == "-f"   || arg == "--file")          { params.fname_out     = argv[++i]; }
+        else if (arg == "-cmd" || arg == "--commands")      { params.commands      = argv[++i]; }
+        else if (arg == "-p"   || arg == "--prompt")        { params.prompt        = argv[++i]; }
+        else if (arg == "-ctx" || arg == "--context")       { params.context       = argv[++i]; }
+        else if (                 arg == "--grammar-penalty") { params.grammar_penalty = std::stof(argv[++i]); }
+        else {
+            fprintf(stderr, "error: unknown argument: %s\n", arg.c_str());
+            whisper_print_usage(argc, argv, params);
+            exit(0);
+        }
+    }
+
+    return true;
+}
+
+std::unique_ptr<WChess> g_wchess;
+void set_moves(const std::string & moves) {
+    if (!moves.empty()) fprintf(stdout, "%s", g_wchess->stringify_board().c_str());
+}
+
+audio_async g_audio(30*1000);
+void get_audio(int ms, std::vector<float> & pcmf32_cur) {
+    g_audio.get(ms, pcmf32_cur);
+}
+
+void clear_audio() {
+    g_audio.clear();
+}
+
+int main(int argc, char ** argv) {
+    whisper_params params;
+
+    if (whisper_params_parse(argc, argv, params) == false) {
+        return 1;
+    }
+
+    if (whisper_lang_id(params.language.c_str()) == -1) {
+        fprintf(stderr, "error: unknown language '%s'\n", params.language.c_str());
+        whisper_print_usage(argc, argv, params);
+        exit(0);
+    }
+
+    // whisper init
+
+    struct whisper_context_params cparams;
+    cparams.use_gpu = params.use_gpu;
+
+    struct whisper_context * ctx = whisper_init_from_file_with_params(params.model.c_str(), cparams);
+
+    // init audio
+
+    if (!g_audio.init(params.capture_id, WHISPER_SAMPLE_RATE)) {
+        fprintf(stderr, "%s: audio.init() failed!\n", __func__);
+        return 1;
+    }
+
+    whisper_full_params wparams = whisper_full_default_params(WHISPER_SAMPLING_BEAM_SEARCH);
+
+    wparams.print_progress   = false;
+    wparams.print_special    = params.print_special;
+    wparams.print_realtime   = false;
+    wparams.print_timestamps = !params.no_timestamps;
+    wparams.translate        = params.translate;
+    wparams.no_context       = true;
+    wparams.no_timestamps    = params.no_timestamps;
+    wparams.single_segment   = true;
+    wparams.max_tokens       = params.max_tokens;
+    wparams.language         = params.language.c_str();
+    wparams.n_threads        = params.n_threads;
+
+    wparams.audio_ctx = params.audio_ctx;
+    wparams.speed_up  = params.speed_up;
+
+    wparams.temperature     = 0.4f;
+    wparams.temperature_inc = 1.0f;
+    wparams.greedy.best_of  = 5;
+
+    wparams.beam_search.beam_size = 5;
+
+    wparams.initial_prompt = params.context.data();
+
+    g_audio.resume();
+
+    // wait for 1 second to avoid any buffered noise
+    std::this_thread::sleep_for(std::chrono::milliseconds(1000));
+    g_audio.clear();
+
+    WChess::callbacks cb;
+    cb.check_running = sdl_poll_events;
+    cb.get_audio = get_audio;
+    cb.set_moves = set_moves;
+    cb.clear_audio = clear_audio;
+
+    WChess::settings s;
+    s.vad_ms = 2000;
+    s.prompt_ms = params.prompt_ms;
+    s.command_ms = params.command_ms;
+    s.vad_thold = params.vad_thold;
+    s.freq_thold = params.freq_thold;
+    s.print_energy = params.print_energy;
+
+    g_wchess.reset(new WChess(ctx, wparams, cb, s));
+    set_moves("start");
+    g_wchess->run();
+
+    g_audio.pause();
+
+    whisper_print_timings(ctx);
+    whisper_free(ctx);
+
+    return 0;
+}

examples/wchess/wchess.wasm/CMakeLists.txt

@@ -0,0 +1,51 @@
+set(TARGET wchess.wasm)
+
+add_executable(${TARGET}
+    wchess.wasm.cpp
+    )
+
+include(DefaultTargetOptions)
+
+target_link_libraries(${TARGET} PRIVATE
+    common
+    libwchess
+    )
+
+unset(EXTRA_FLAGS)
+
+if (WHISPER_WASM_SINGLE_FILE)
+    set(EXTRA_FLAGS "-s SINGLE_FILE=1")
+    message(STATUS "Embedding WASM inside chess.js")
+
+    add_custom_command(
+        TARGET ${TARGET} POST_BUILD
+        COMMAND ${CMAKE_COMMAND} -E copy
+        ${CMAKE_BINARY_DIR}/bin/${TARGET}.js
+        ${CMAKE_RUNTIME_OUTPUT_DIRECTORY}/${TARGET}/js/chess.js
+        )
+endif()
+
+set_target_properties(${TARGET} PROPERTIES LINK_FLAGS " \
+    --bind \
+    -s USE_PTHREADS=1 \
+    -s PTHREAD_POOL_SIZE=8 \
+    -s INITIAL_MEMORY=1024MB \
+    -s TOTAL_MEMORY=1024MB \
+    -s FORCE_FILESYSTEM=1 \
+    -s EXPORTED_RUNTIME_METHODS=\"['print', 'printErr', 'ccall', 'cwrap']\" \
+    ${EXTRA_FLAGS} \
+    ")
+
+
+add_custom_command(
+        TARGET ${TARGET} POST_BUILD
+        COMMAND ${CMAKE_COMMAND} -E copy_directory
+        ${CMAKE_CURRENT_SOURCE_DIR}/chessboardjs-1.0.0
+        ${CMAKE_RUNTIME_OUTPUT_DIRECTORY}/${TARGET}/
+        COMMAND ${CMAKE_COMMAND} -E copy
+        ${CMAKE_CURRENT_SOURCE_DIR}/jquery-3.7.1.min.js
+        ${CMAKE_RUNTIME_OUTPUT_DIRECTORY}/${TARGET}/js/
+    )
+
+configure_file(${CMAKE_CURRENT_SOURCE_DIR}/index-tmpl.html  ${CMAKE_RUNTIME_OUTPUT_DIRECTORY}/${TARGET}/index.html @ONLY)
+configure_file(${CMAKE_SOURCE_DIR}/examples/helpers.js    ${CMAKE_RUNTIME_OUTPUT_DIRECTORY}/${TARGET}/js/helpers.js @ONLY)

examples/wchess/wchess.wasm/chessboardjs-1.0.0/CHANGELOG.md

@@ -0,0 +1,32 @@
+# chessboard.js Change Log
+
+All notable changes to this project will be documented in this file.
+
+## [1.0.0] - 2019-06-11
+- Orientation methods now return current orientation. [Issue #64]
+- Drop support for IE8
+- Do not check for `window.JSON` (Error #1004)
+- Rename `ChessBoard` to `Chessboard` (`ChessBoard` is still supported, however)
+- id query selectors are now supported as the first argument to `Chessboard()`
+- Remove Error #1002
+- Format code according to [StandardJS]
+- Bump minimum jQuery version to 1.8.3
+- Throttle piece drag functions
+
+## [0.3.0] - 2013-08-10
+- Added `appearSpeed` animation config property
+- Added `onSnapbackEnd` event
+- Added `onMoveEnd` event
+
+## [0.2.0] - 2013-08-05
+- Added `onMouseoverSquare` and `onMouseoutSquare` events
+- Added `onSnapEnd` event
+- Added square code as CSS class on the squares
+- Added [chess.js] integration examples
+
+## [0.1.0] - 2013-05-21
+- Initial release
+
+[chess.js]:https://github.com/jhlywa/chess.js
+[Issue #64]:https://github.com/oakmac/chessboardjs/issues/64
+[StandardJS]:https://standardjs.com/

examples/wchess/wchess.wasm/chessboardjs-1.0.0/LICENSE.md

@@ -0,0 +1,20 @@
+Copyright 2019 Chris Oakman
+
+Permission is hereby granted, free of charge, to any person obtaining
+a copy of this software and associated documentation files (the
+"Software"), to deal in the Software without restriction, including
+without limitation the rights to use, copy, modify, merge, publish,
+distribute, sublicense, and/or sell copies of the Software, and to
+permit persons to whom the Software is furnished to do so, subject to
+the following conditions:
+
+The above copyright notice and this permission notice shall be
+included in all copies or substantial portions of the Software.
+
+THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
+EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
+MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
+NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE
+LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION
+OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION
+WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.

examples/wchess/wchess.wasm/chessboardjs-1.0.0/README.md

@@ -0,0 +1,82 @@
+# chessboard.js
+
+chessboard.js is a JavaScript chessboard component. It depends on [jQuery].
+
+Please see [chessboardjs.com] for documentation and examples.
+
+## What is chessboard.js?
+
+chessboard.js is a JavaScript chessboard component with a flexible "just a
+board" API that
+
+chessboard.js is a standalone JavaScript Chess Board. It is designed to be "just
+a board" and expose a powerful API so that it can be used in different ways.
+Here's a non-exhaustive list of things you can do with chessboard.js:
+
+- Use chessboard.js to show game positions alongside your expert commentary.
+- Use chessboard.js to have a tactics website where users have to guess the best
+  move.
+- Integrate chessboard.js and [chess.js] with a PGN database and allow people to
+  search and playback games (see [Example 5000])
+- Build a chess server and have users play their games out using the
+  chessboard.js board.
+
+chessboard.js is flexible enough to handle any of these situations with relative
+ease.
+
+## What can chessboard.js **not** do?
+
+The scope of chessboard.js is limited to "just a board." This is intentional and
+makes chessboard.js flexible for handling a multitude of chess-related problems.
+
+This is a common source of confusion for new users. [remove?]
+
+Specifically, chessboard.js does not understand anything about how the game of
+chess is played: how a knight moves, who's turn is it, is White in check?, etc.
+
+Fortunately, the powerful [chess.js] library deals with exactly this sort of
+problem domain and plays nicely with chessboard.js's flexible API. Some examples
+of chessboard.js combined with chess.js: 5000, 5001, 5002
+
+Please see the powerful [chess.js] library for an API to deal with these sorts
+of questions.
+
+
+This logic is distinct from the logic of the board. Please see the powerful
+[chess.js] library for this aspect of your application.
+
+
+
+Here is a list of things that chessboard.js is **not**:
+
+- A chess engine
+- A legal move validator
+- A PGN parser
+
+chessboard.js is designed to work well with any of those things, but the idea
+behind chessboard.js is that the logic that controls the board should be
+independent of those other problems.
+
+## Docs and Examples
+
+- Docs - <http://chessboardjs.com/docs>
+- Examples - <http://chessboardjs.com/examples>
+
+## Developer Tools
+
+```sh
+# create a build in the build/ directory
+npm run build
+
+# re-build the website
+npm run website
+```
+
+## License
+
+[MIT License](LICENSE.md)
+
+[jQuery]:https://jquery.com/
+[chessboardjs.com]:http://chessboardjs.com
+[chess.js]:https://github.com/jhlywa/chess.js
+[Example 5000]:http://chessboardjs.com/examples#5000

examples/wchess/wchess.wasm/chessboardjs-1.0.0/css/chessboard-1.0.0.css

@@ -0,0 +1,54 @@
+/*! chessboard.js v1.0.0 | (c) 2019 Chris Oakman | MIT License chessboardjs.com/license */
+
+.clearfix-7da63 {
+  clear: both;
+}
+
+.board-b72b1 {
+  border: 2px solid #404040;
+  box-sizing: content-box;
+}
+
+.square-55d63 {
+  float: left;
+  position: relative;
+
+  /* disable any native browser highlighting */
+  -webkit-touch-callout: none;
+    -webkit-user-select: none;
+     -khtml-user-select: none;
+       -moz-user-select: none;
+        -ms-user-select: none;
+            user-select: none;
+}
+
+.white-1e1d7 {
+  background-color: #f0d9b5;
+  color: #b58863;
+}
+
+.black-3c85d {
+  background-color: #b58863;
+  color: #f0d9b5;
+}
+
+.highlight1-32417, .highlight2-9c5d2 {
+  box-shadow: inset 0 0 3px 3px yellow;
+}
+
+.notation-322f9 {
+  cursor: default;
+  font-family: "Helvetica Neue", Helvetica, Arial, sans-serif;
+  font-size: 14px;
+  position: absolute;
+}
+
+.alpha-d2270 {
+  bottom: 1px;
+  right: 3px;
+}
+
+.numeric-fc462 {
+  top: 2px;
+  left: 2px;
+}

examples/wchess/wchess.wasm/chessboardjs-1.0.0/css/chessboard-1.0.0.min.css

@@ -0,0 +1,2 @@
+/*! chessboard.js v1.0.0 | (c) 2019 Chris Oakman | MIT License chessboardjs.com/license */
+.clearfix-7da63{clear:both}.board-b72b1{border:2px solid #404040;box-sizing:content-box}.square-55d63{float:left;position:relative;-webkit-touch-callout:none;-webkit-user-select:none;-khtml-user-select:none;-moz-user-select:none;-ms-user-select:none;user-select:none}.white-1e1d7{background-color:#f0d9b5;color:#b58863}.black-3c85d{background-color:#b58863;color:#f0d9b5}.highlight1-32417,.highlight2-9c5d2{box-shadow:inset 0 0 3px 3px #ff0}.notation-322f9{cursor:default;font-family:"Helvetica Neue",Helvetica,Arial,sans-serif;font-size:14px;position:absolute}.alpha-d2270{bottom:1px;right:3px}.numeric-fc462{top:2px;left:2px}

examples/wchess/wchess.wasm/chessboardjs-1.0.0/package.json

@@ -0,0 +1,29 @@
+{
+  "author": "Chris Oakman <chris@oakmac.com> (http://chrisoakman.com/)",
+  "name": "@chrisoakman/chessboardjs",
+  "description": "JavaScript chessboard widget",
+  "homepage": "https://chessboardjs.com",
+  "license": "MIT",
+  "version": "1.0.0",
+  "repository": {
+    "type": "git",
+    "url": "git://github.com/oakmac/chessboardjs.git"
+  },
+  "files": ["dist/"],
+  "dependencies": {
+    "jquery": ">=3.4.1"
+  },
+  "devDependencies": {
+    "csso": "3.5.1",
+    "fs-plus": "3.1.1",
+    "kidif": "1.1.0",
+    "mustache": "2.3.0",
+    "standard": "10.0.2",
+    "uglify-js": "3.6.0"
+  },
+  "scripts": {
+    "build": "standard lib/chessboard.js && node scripts/build.js",
+    "standard": "standard --fix lib/*.js website/js/*.js",
+    "website": "node scripts/website.js"
+  }
+}

examples/wchess/wchess.wasm/index-tmpl.html

@@ -0,0 +1,376 @@
+<!doctype html>
+<html lang="en-us">
+    <head>
+        <title>wchess : Voice assistant example using Whisper + WebAssembly</title>
+
+        <style>
+            #output {
+                width: 100%;
+                height: 100%;
+                margin: 0 auto;
+                margin-top: 10px;
+                border-left: 0px;
+                border-right: 0px;
+                padding-left: 0px;
+                padding-right: 0px;
+                display: block;
+                background-color: black;
+                color: white;
+                font-size: 10px;
+                font-family: 'Lucida Console', Monaco, monospace;
+                outline: none;
+                white-space: pre;
+                overflow-wrap: normal;
+                overflow-x: scroll;
+            }
+        </style>
+        <link rel="stylesheet" href="css/chessboard-1.0.0.min.css" integrity="sha384-q94+BZtLrkL1/ohfjR8c6L+A6qzNH9R2hBLwyoAfu3i/WCvQjzL2RQJ3uNHDISdU" crossorigin="anonymous">
+    </head>
+    <body onload="loadWhisper()">
+        <div id="main-container">
+            <b>wchess : Voice assistant example using Whisper + WebAssembly</b>
+
+            <br><br>
+
+            You can find more about this project on <a href="https://github.com/ggerganov/whisper.cpp/tree/master/examples/command.wasm">GitHub</a>.
+
+            <br><br>
+
+            <b>More examples:</b>
+                <a href="https://whisper.ggerganov.com/">main</a> |
+                <a href="https://whisper.ggerganov.com/bench">bench</a> |
+                <a href="https://whisper.ggerganov.com/stream">stream</a> |
+                <a href="https://whisper.ggerganov.com/command">command</a> |
+                <a href="https://whisper.ggerganov.com/talk">talk</a> |
+
+            <br><br>
+
+            <hr>
+
+            <div id="model-whisper">
+                Whisper model: <span id="model-whisper-status"></span>
+                <span id="fetch-whisper-progress"></span>
+                <button id="clear" onclick="clearCache()">Clear Cache</button>
+                <!--
+                    <input type="file" id="file" name="file" onchange="loadFile(event, 'whisper.bin')" />
+                -->
+            </div>
+
+            <br>
+            <div id="myBoard" style="width: 400px"></div>
+            <script src="js/jquery-3.7.1.min.js"></script>
+            <script src="js/chessboard-1.0.0.min.js"></script>
+            <script>
+                var board = Chessboard('myBoard', 'start')
+            </script>
+
+            <br>
+
+            <div id="input">
+                <button id="toggler" disabled>Hold</button>
+            </div>
+
+            <br>
+
+            <div id="state">
+                Status: <b><span id="state-status">not started</span></b>
+
+                <pre id="state-moves">[The moves will be displayed here]</pre>
+            </div>
+
+            <hr>
+
+            Debug output:
+            <textarea id="output" rows="20"></textarea>
+
+            <br>
+
+            <b>Troubleshooting</b>
+
+            <br><br>
+
+            The page does some heavy computations, so make sure:
+
+            <ul>
+                <li>To use a modern web browser (e.g. Chrome, Firefox)</li>
+                <li>To use a fast desktop or laptop computer (i.e. not a mobile phone)</li>
+                <li>Your browser supports WASM <a href="https://webassembly.org/roadmap/">Fixed-width SIMD</a></li>
+            </ul>
+
+            <div class="cell-version">
+                <span>
+                    |
+                    Build time: <span class="nav-link">@GIT_DATE@</span> |
+                    Commit hash: <a class="nav-link" href="https://github.com/ggerganov/whisper.cpp/commit/@GIT_SHA1@">@GIT_SHA1@</a> |
+                    Commit subject: <span class="nav-link">@GIT_COMMIT_SUBJECT@</span> |
+                    <a class="nav-link" href="https://github.com/ggerganov/whisper.cpp/tree/master/examples/command.wasm">Source Code</a> |
+                </span>
+            </div>
+        </div>
+
+        <script type="text/javascript" src="js/helpers.js"></script>
+        <script type='text/javascript'>
+            // web audio context
+            var context = null;
+
+            // the command instance
+            var instance = null;
+
+            // model name
+            var model_whisper = null;
+
+            var Module = {
+                print: printTextarea,
+                printErr: printTextarea,
+                setStatus: function(text) {
+                    printTextarea('js: ' + text);
+                },
+                monitorRunDependencies: function(left) {
+                },
+                preRun: function() {
+                    printTextarea('js: Preparing ...');
+                },
+                postRun: function() {
+                    printTextarea('js: Module initialized successfully!');
+                    instance = Module.init('whisper.bin');
+
+                    if (instance) {
+                        printTextarea("js: whisper initialized, instance: " + instance);
+                    }
+                    else {
+                        printTextarea("js: failed to initialize whisper");
+                    }
+                }
+            };
+
+            //
+            // fetch models
+            //
+
+            let dbVersion = 1
+            let dbName    = 'whisper.ggerganov.com';
+            let indexedDB = window.indexedDB || window.mozIndexedDB || window.webkitIndexedDB || window.msIndexedDB
+
+            function storeFS(fname, buf) {
+                // write to WASM file using FS_createDataFile
+                // if the file exists, delete it
+                try {
+                    Module.FS_unlink(fname);
+                } catch (e) {
+                    // ignore
+                }
+
+                Module.FS_createDataFile("/", fname, buf, true, true);
+
+                printTextarea('storeFS: stored model: ' + fname + ' size: ' + buf.length);
+
+                document.getElementById('model-whisper-status').innerHTML = 'loaded "' + model_whisper + '"!';
+
+                if (model_whisper != null) {
+                    document.getElementById('toggler').disabled = false;
+                }
+            }
+
+            function loadWhisper() {
+                // let urls = {
+                //     'tiny.en': 'https://whisper.ggerganov.com/ggml-model-whisper-tiny.en.bin',
+                //     'base.en': 'https://whisper.ggerganov.com/ggml-model-whisper-base.en.bin',
+
+                //     'tiny-en-q5_1':  'https://whisper.ggerganov.com/ggml-model-whisper-tiny.en-q5_1.bin',
+                //     'base-en-q5_1':  'https://whisper.ggerganov.com/ggml-model-whisper-base.en-q5_1.bin',
+                // };
+
+                // let sizes = {
+                //     'tiny.en': 75,
+                //     'base.en': 142,
+
+                //     'tiny-en-q5_1':   31,
+                //     'base-en-q5_1':   57,
+                // };
+
+                let url     = 'https://whisper.ggerganov.com/ggml-model-whisper-tiny.en-q8_0.bin';
+                let dst     = 'whisper.bin';
+                let size_mb = 75;
+
+                model_whisper = 'tiny.en';
+
+                document.getElementById('model-whisper-status').innerHTML = 'loading "' + model_whisper + '" ... ';
+
+                cbProgress = function(p) {
+                    let el = document.getElementById('fetch-whisper-progress');
+                    el.innerHTML = Math.round(100*p) + '%';
+                };
+
+                cbCancel = function() {
+                    var el;
+                    el = document.getElementById('model-whisper-status');  if (el) el.innerHTML = '';
+                };
+
+                loadRemote(url, dst, size_mb, cbProgress, storeFS, cbCancel, printTextarea);
+            }
+
+            //
+            // microphone
+            //
+
+            const kSampleRate = 16000;
+            const kRestartRecording_s = 120;
+            const kIntervalAudio_ms = 250; // pass the recorded audio to the C++ instance at this rate
+
+            var mediaRecorder = null;
+            var doRecording = false;
+            var startTime = 0;
+
+            window.AudioContext = window.AudioContext || window.webkitAudioContext;
+            window.OfflineAudioContext = window.OfflineAudioContext || window.webkitOfflineAudioContext;
+
+            function stopRecording() {
+                Module.set_status("paused");
+                mediaRecorder.stop();
+            }
+
+            function startRecording() {
+                if (!context) {
+                    context = new AudioContext({
+                        sampleRate: kSampleRate,
+                        channelCount: 1,
+                        echoCancellation: false,
+                        autoGainControl:  true,
+                        noiseSuppression: true,
+                    });
+                }
+
+                startTime = Date.now();
+
+                var chunks = [];
+                var stream = null;
+
+                navigator.mediaDevices.getUserMedia({audio: true, video: false})
+                    .then(function(s) {
+                        stream = s;
+                        mediaRecorder = new MediaRecorder(stream);
+                        mediaRecorder.ondataavailable = function(e) {
+                            chunks.push(e.data);
+
+                            var blob = new Blob(chunks, { 'type' : 'audio/ogg; codecs=opus' });
+                            var reader = new FileReader();
+
+                            reader.onload = function(event) {
+                                var buf = new Uint8Array(reader.result);
+
+                                if (!context) {
+                                    return;
+                                }
+                                context.decodeAudioData(buf.buffer, function(audioBuffer) {
+                                    var offlineContext = new OfflineAudioContext(audioBuffer.numberOfChannels, audioBuffer.length, audioBuffer.sampleRate);
+                                    var source = offlineContext.createBufferSource();
+                                    source.buffer = audioBuffer;
+                                    source.connect(offlineContext.destination);
+                                    source.start(0);
+
+                                    offlineContext.startRendering().then(function(renderedBuffer) {
+                                        let audio = renderedBuffer.getChannelData(0);
+
+                                        if (instance) {
+                                            printTextarea('js: number of samples: ' + audio.length);
+                                            Module.set_audio(instance, audio);
+                                        }
+                                    });
+
+                                    mediaRecorder = null;
+                                    context = null;
+                                });
+                            }
+
+                            reader.readAsArrayBuffer(blob);
+                        };
+
+                        mediaRecorder.onstop = function(e) {
+                            stream.getTracks().forEach(function(track) {
+                                track.stop();
+                            });
+                        };
+
+                        mediaRecorder.start();
+                    })
+                    .catch(function(err) {
+                        printTextarea('js: error getting audio stream: ' + err);
+                    });
+            }
+
+            //
+            // main
+            //
+
+            var nLines = 0;
+            var intervalUpdate = null;
+            var movesAll = '';
+
+            document.body.addEventListener('keydown', function(event) {
+                if (event.keyCode === 32) {
+                    document.getElementById('toggler').innerText = "Release";
+                    onStart();
+                }
+            }, true);
+
+            document.body.addEventListener('keyup', function(event) {
+                if (event.keyCode === 32) {
+                    document.getElementById('toggler').innerText = "Hold";
+                    onStop();
+                }
+            }, true);
+
+            document.getElementById('toggler').addEventListener('mousedown', function(event) {
+                this.innerText = "Release";
+                onStart();
+            }, true);
+
+            document.getElementById('toggler').addEventListener('mouseup', function(event) {
+                this.innerText = "Hold";
+                onStop();
+            }, true);
+
+            function onStart() {
+                if (!instance) {
+                    return;
+                }
+
+                startRecording();
+            }
+
+            function onStop() {
+                printTextarea('js: stopping recording ...');
+                stopRecording();
+
+                var interval = setInterval(function() {
+                    var moves = Module.get_moves();
+
+                    if (moves != null && moves.length > 1) {
+                        clearInterval(interval);
+
+                        for (move of moves.split(' ')) {
+                            board.move(move);
+                        }
+
+                        movesAll += moves + '<br>';
+                        nLines++;
+
+                        // if more than 10 lines, remove the first line
+                        if (nLines > 10) {
+                            var i = movesAll.indexOf('<br>');
+                            if (i > 0) {
+                                movesAll = movesAll.substring(i + 4);
+                                nLines--;
+                            }
+                        }
+
+                        document.getElementById('state-status').innerHTML = Module.get_status();
+                        document.getElementById('state-moves').innerHTML = movesAll;
+                    }
+                }, 100);
+            }
+
+        </script>
+        <script type="text/javascript" src="js/chess.js"></script>
+    </body>
+</html>

examples/wchess/wchess.wasm/wchess.wasm.cpp

@@ -0,0 +1,173 @@
+#include <WChess.h>
+#include <emscripten/bind.h>
+
+#include <atomic>
+#include <thread>
+
+constexpr int N_THREAD = 8;
+
+std::vector<struct whisper_context *> g_contexts(4, nullptr);
+
+std::mutex  g_mutex;
+std::thread g_worker;
+
+std::atomic<bool> g_running(false);
+
+std::string g_status        = "";
+std::string g_status_forced = "";
+std::string g_moves         = "";
+
+std::vector<float> g_pcmf32;
+
+void set_status(const std::string & status) {
+    std::lock_guard<std::mutex> lock(g_mutex);
+    g_status = status;
+}
+
+void set_moves(const std::string & moves) {
+    std::lock_guard<std::mutex> lock(g_mutex);
+    g_moves = moves;
+}
+
+void get_audio(int /* ms */, std::vector<float> & audio) {
+    std::lock_guard<std::mutex> lock(g_mutex);
+    audio = g_pcmf32;
+}
+
+bool check_running() {
+    return g_running;
+}
+
+void clear_audio() {
+    std::lock_guard<std::mutex> lock(g_mutex);
+    g_pcmf32.clear();
+}
+
+void wchess_main(size_t i) {
+    struct whisper_full_params wparams = whisper_full_default_params(whisper_sampling_strategy::WHISPER_SAMPLING_GREEDY);
+
+    wparams.n_threads        = std::min(N_THREAD, (int) std::thread::hardware_concurrency());
+    wparams.offset_ms        = 0;
+    wparams.translate        = false;
+    wparams.no_context       = true;
+    wparams.single_segment   = true;
+    wparams.print_realtime   = false;
+    wparams.print_progress   = false;
+    wparams.print_timestamps = true;
+    wparams.print_special    = false;
+    wparams.no_timestamps    = true;
+
+    wparams.max_tokens       = 32;
+    wparams.audio_ctx        = 768; // partial encoder context for better performance
+
+    wparams.temperature     = 0.0f;
+    wparams.temperature_inc = 2.0f;
+    wparams.greedy.best_of  = 1;
+
+    wparams.beam_search.beam_size = 1;
+
+    wparams.language         = "en";
+
+    wparams.grammar_penalty = 100.0;
+    wparams.initial_prompt = "bishop to c3, rook to d4, knight to e5, d4 d5, knight to c3, c3, queen to d4, king b1, pawn to a1, bishop to b2, knight to c3,";
+
+    printf("command: using %d threads\n", wparams.n_threads);
+
+    WChess::callbacks cb;
+    cb.set_status = set_status;
+    cb.check_running = check_running;
+    cb.get_audio = get_audio;
+    cb.set_moves = set_moves;
+    cb.clear_audio = clear_audio;
+
+    WChess(g_contexts[i], wparams, cb, {}).run();
+    if (i < g_contexts.size()) {
+        whisper_free(g_contexts[i]);
+        g_contexts[i] = nullptr;
+    }
+}
+
+EMSCRIPTEN_BINDINGS(command) {
+    emscripten::function("init", emscripten::optional_override([](const std::string & path_model) {
+        for (size_t i = 0; i < g_contexts.size(); ++i) {
+            if (g_contexts[i] == nullptr) {
+                g_contexts[i] = whisper_init_from_file_with_params(path_model.c_str(), whisper_context_default_params());
+                if (g_contexts[i] != nullptr) {
+                    g_running = true;
+                    if (g_worker.joinable()) {
+                        g_worker.join();
+                    }
+                    g_worker = std::thread([i]() {
+                        wchess_main(i);
+                    });
+
+                    return i + 1;
+                } else {
+                    return (size_t) 0;
+                }
+            }
+        }
+
+        return (size_t) 0;
+    }));
+
+    emscripten::function("free", emscripten::optional_override([](size_t /* index */) {
+        if (g_running) {
+            g_running = false;
+        }
+    }));
+
+    emscripten::function("set_audio", emscripten::optional_override([](size_t index, const emscripten::val & audio) {
+        --index;
+
+        if (index >= g_contexts.size()) {
+            return -1;
+        }
+
+        if (g_contexts[index] == nullptr) {
+            return -2;
+        }
+
+        {
+            std::lock_guard<std::mutex> lock(g_mutex);
+            const int n = audio["length"].as<int>();
+
+            emscripten::val heap = emscripten::val::module_property("HEAPU8");
+            emscripten::val memory = heap["buffer"];
+
+            g_pcmf32.resize(n);
+
+            emscripten::val memoryView = audio["constructor"].new_(memory, reinterpret_cast<uintptr_t>(g_pcmf32.data()), n);
+            memoryView.call<void>("set", audio);
+        }
+
+        return 0;
+    }));
+
+    emscripten::function("get_moves", emscripten::optional_override([]() {
+        std::string moves;
+
+        {
+            std::lock_guard<std::mutex> lock(g_mutex);
+            moves = std::move(g_moves);
+        }
+
+        return moves;
+    }));
+
+    emscripten::function("get_status", emscripten::optional_override([]() {
+        std::string status;
+
+        {
+            std::lock_guard<std::mutex> lock(g_mutex);
+            status = g_status_forced.empty() ? g_status : g_status_forced;
+        }
+
+        return status;
+    }));
+
+    emscripten::function("set_status", emscripten::optional_override([](const std::string & status) {
+        std::lock_guard<std::mutex> lock(g_mutex);
+        g_status_forced = status;
+    }));
+}

ggml-alloc.c

@@ -446,12 +446,14 @@ static ggml_tallocr_t node_tallocr(ggml_gallocr_t galloc, struct ggml_tensor * n
     return galloc->hash_allocs[ggml_hash_find_or_insert(galloc->hash_set, node)];
 }
 
-static void init_view(ggml_gallocr_t galloc, struct ggml_tensor * view) {
+static void init_view(ggml_gallocr_t galloc, struct ggml_tensor * view, bool update_backend) {
     ggml_tallocr_t alloc = node_tallocr(galloc, view);
 
     //printf("init_view: %s from src %s\n", view->name, view->view_src->name);
     GGML_ASSERT(view->view_src != NULL && view->view_src->data != NULL);
-    view->backend = view->view_src->backend;
+    if (update_backend) {
+        view->backend = view->view_src->backend;
+    }
     view->buffer  = view->view_src->buffer;
     view->data    = (char *)view->view_src->data + view->view_offs;
 
@@ -469,7 +471,7 @@ static void allocate_node(ggml_gallocr_t galloc, struct ggml_tensor * node) {
 
     if (node->data == NULL) {
         if (ggml_is_view(node)) {
-            init_view(galloc, node);
+            init_view(galloc, node, true);
         } else {
             // see if we can reuse a parent's buffer (inplace)
             if (ggml_op_can_inplace(node->op)) {
@@ -499,15 +501,14 @@ static void allocate_node(ggml_gallocr_t galloc, struct ggml_tensor * node) {
                                 AT_PRINTF("reusing view parent %s (%s) for %s\n", parent->name, view_src->name, node->name);
                                 node->view_src = view_src;
                                 view_src_hn->n_views += 1;
-                                init_view(galloc, node);
+                                init_view(galloc, node, false);
                                 return;
                             }
-                        }
+                        } else {
-                        else {
                             AT_PRINTF("reusing parent %s for %s\n", parent->name, node->name);
                             node->view_src = parent;
                             p_hn->n_views += 1;
-                            init_view(galloc, node);
+                            init_view(galloc, node, false);
                             return;
                         }
                     }
@@ -537,7 +538,7 @@ static void ggml_tallocr_alloc_graph_impl(ggml_gallocr_t galloc, struct ggml_cgr
             hash_get(galloc, view_src)->n_views += 1;
             if (node->buffer == NULL && node->data != NULL) {
                 // view of a pre-allocated tensor, didn't call init_view() yet
-                init_view(galloc, node);
+                init_view(galloc, node, true);
             }
         }
 
@@ -548,7 +549,7 @@ static void ggml_tallocr_alloc_graph_impl(ggml_gallocr_t galloc, struct ggml_cgr
             }
             hash_get(galloc, parent)->n_children += 1;
             if (ggml_is_view(parent) && parent->buffer == NULL && parent->data != NULL) {
-                init_view(galloc, parent);
+                init_view(galloc, parent, true);
             }
         }
    }
@@ -663,7 +664,7 @@ size_t ggml_gallocr_alloc_graph(ggml_gallocr_t galloc, ggml_tallocr_t talloc, st
     return max_size;
 }
 
-void ggml_gallocr_alloc_graph_n(ggml_gallocr_t galloc, struct ggml_cgraph * graph, struct ggml_hash_set hash_set, ggml_tallocr_t * hash_node_alloct) {
+void ggml_gallocr_alloc_graph_n(ggml_gallocr_t galloc, struct ggml_cgraph * graph, struct ggml_hash_set hash_set, ggml_tallocr_t * hash_node_talloc) {
     const size_t hash_size = hash_set.size;
 
     GGML_ASSERT(hash_size >= (size_t)(graph->n_nodes + graph->n_leafs));
@@ -686,7 +687,7 @@ void ggml_gallocr_alloc_graph_n(ggml_gallocr_t galloc, struct ggml_cgraph * grap
     // reset hash values
     memset(galloc->hash_values, 0, sizeof(struct hash_node) * hash_size);
 
-    galloc->hash_allocs = hash_node_alloct;
+    galloc->hash_allocs = hash_node_talloc;
 
     ggml_tallocr_alloc_graph_impl(galloc, graph);
 

ggml-cuda.cu

@@ -6142,6 +6142,9 @@ inline void ggml_cuda_op_add(
     const ggml_tensor * src0, const ggml_tensor * src1, ggml_tensor * dst,
     const float * src0_dd, const float * src1_dd, float * dst_dd, const cudaStream_t & main_stream) {
 
+    GGML_ASSERT(ggml_is_contiguous(src0));
+    GGML_ASSERT(ggml_is_contiguous(src1));
+
     GGML_ASSERT(src1->type == GGML_TYPE_F32);
 
     const int64_t ne10 = src1->ne[0];

ggml-quants.c

@@ -1368,7 +1368,12 @@ static float make_qkx2_quants(int n, int nmax, const float * restrict x, const f
     float max = x[0];
     float sum_w = weights[0];
     float sum_x = sum_w * x[0];
+#ifdef HAVE_BUGGY_APPLE_LINKER
+    // use 'volatile' to prevent unroll and work around a bug in Apple ld64 1015.7
+    for (volatile int i = 1; i < n; ++i) {
+#else
     for (int i = 1; i < n; ++i) {
+#endif
         if (x[i] < min) min = x[i];
         if (x[i] > max) max = x[i];
         float w = weights[i];

ggml.c

@@ -5024,8 +5024,13 @@ struct ggml_tensor * ggml_rope_back(
         int                   n_dims,
         int                   mode,
         int                   n_ctx,
+        int                   n_orig_ctx,
         float                 freq_base,
         float                 freq_scale,
+        float                 ext_factor,
+        float                 attn_factor,
+        float                 beta_fast,
+        float                 beta_slow,
         float                 xpos_base,
         bool                  xpos_down) {
     GGML_ASSERT(ggml_is_vector(b));
@@ -5042,11 +5047,15 @@ struct ggml_tensor * ggml_rope_back(
 
     struct ggml_tensor * result = ggml_dup_tensor(ctx, a);
 
-    int32_t params[8] = { /*n_past*/ 0, n_dims, mode, n_ctx };
+    int32_t params[13] = { /*n_past*/ 0, n_dims, mode, n_ctx, n_orig_ctx };
-    memcpy(params + 4, &freq_base,  sizeof(float));
+    memcpy(params +  5, &freq_base,    sizeof(float));
-    memcpy(params + 5, &freq_scale, sizeof(float));
+    memcpy(params +  6, &freq_scale,   sizeof(float));
-    memcpy(params + 6, &xpos_base,  sizeof(float));
+    memcpy(params +  7, &ext_factor,   sizeof(float));
-    memcpy(params + 7, &xpos_down,  sizeof(bool));
+    memcpy(params +  8, &attn_factor,  sizeof(float));
+    memcpy(params +  9, &beta_fast,    sizeof(float));
+    memcpy(params + 10, &beta_slow,    sizeof(float));
+    memcpy(params + 11, &xpos_base,    sizeof(float));
+    memcpy(params + 12, &xpos_down,    sizeof(bool));
     ggml_set_op_params(result, params, sizeof(params));
 
     result->op   = GGML_OP_ROPE_BACK;
@@ -9376,7 +9385,6 @@ static bool ggml_compute_forward_mul_mat_use_blas(
 }
 #endif
 
-
 static void ggml_compute_forward_mul_mat(
         const struct ggml_compute_params * params,
         const struct ggml_tensor * src0,
@@ -10946,7 +10954,8 @@ static void ggml_compute_forward_rope_f32(
         const struct ggml_compute_params * params,
         const struct ggml_tensor * src0,
         const struct ggml_tensor * src1,
-        struct ggml_tensor * dst) {
+        struct ggml_tensor * dst,
+        const bool forward) {
     if (params->type == GGML_TASK_INIT || params->type == GGML_TASK_FINALIZE) {
         return;
     }
@@ -11005,6 +11014,11 @@ static void ggml_compute_forward_rope_f32(
     const bool is_neox = mode & 2;
     const bool is_glm  = mode & 4;
 
+    // backward process uses inverse rotation by cos and sin.
+    // cos and sin build a rotation matrix, where the inverse is the transpose.
+    // this essentially just switches the sign of sin.
+    const float sin_sign = forward ? 1.0f : -1.0f;
+
     const int32_t * pos = (const int32_t *) src1->data;
 
     for (int64_t i3 = 0; i3 < ne3; i3++) {
@@ -11021,9 +11035,9 @@ static void ggml_compute_forward_rope_f32(
                     float block_theta = MAX(p - (n_ctx - 2), 0);
                     for (int64_t i0 = 0; i0 < ne0 / 4; i0++) {
                         const float cos_theta = cosf(theta_base);
-                        const float sin_theta = sinf(theta_base);
+                        const float sin_theta = sinf(theta_base) * sin_sign;
                         const float cos_block_theta = cosf(block_theta);
-                        const float sin_block_theta = sinf(block_theta);
+                        const float sin_block_theta = sinf(block_theta) * sin_sign;
 
                         theta_base *= theta_scale;
                         block_theta *= theta_scale;
@@ -11047,6 +11061,7 @@ static void ggml_compute_forward_rope_f32(
                         rope_yarn(
                             theta_base, freq_scale, corr_dims, i0, ext_factor, attn_factor, &cos_theta, &sin_theta
                         );
+                        sin_theta *= sin_sign;
 
                         // zeta scaling for xPos only:
                         float zeta = xpos_base != 0.0f ? powf((i0 + 0.4f * ne0) / (1.4f * ne0), p / xpos_base) : 1.0f;
@@ -11077,6 +11092,7 @@ static void ggml_compute_forward_rope_f32(
                                 theta_base, freq_scale, corr_dims, cur_rot, ext_factor, attn_factor,
                                 &cos_theta, &sin_theta
                             );
+                            sin_theta *= sin_sign;
 
                             theta_base *= theta_scale;
 
@@ -11102,7 +11118,8 @@ static void ggml_compute_forward_rope_f16(
         const struct ggml_compute_params * params,
         const struct ggml_tensor * src0,
         const struct ggml_tensor * src1,
-        struct ggml_tensor * dst) {
+        struct ggml_tensor * dst,
+        const bool forward) {
     if (params->type == GGML_TASK_INIT || params->type == GGML_TASK_FINALIZE) {
         return;
     }
@@ -11154,6 +11171,11 @@ static void ggml_compute_forward_rope_f16(
     const bool is_neox = mode & 2;
     const bool is_glm  = mode & 4;
 
+    // backward process uses inverse rotation by cos and sin.
+    // cos and sin build a rotation matrix, where the inverse is the transpose.
+    // this essentially just switches the sign of sin.
+    const float sin_sign = forward ? 1.0f : -1.0f;
+
     const int32_t * pos = (const int32_t *) src1->data;
 
     for (int64_t i3 = 0; i3 < ne3; i3++) {
@@ -11170,9 +11192,9 @@ static void ggml_compute_forward_rope_f16(
                     float block_theta = MAX(p - (n_ctx - 2), 0);
                     for (int64_t i0 = 0; i0 < ne0 / 4; i0++) {
                         const float cos_theta = cosf(theta_base);
-                        const float sin_theta = sinf(theta_base);
+                        const float sin_theta = sinf(theta_base) * sin_sign;
                         const float cos_block_theta = cosf(block_theta);
-                        const float sin_block_theta = sinf(block_theta);
+                        const float sin_block_theta = sinf(block_theta) * sin_sign;
 
                         theta_base *= theta_scale;
                         block_theta *= theta_scale;
@@ -11196,6 +11218,7 @@ static void ggml_compute_forward_rope_f16(
                         rope_yarn(
                             theta_base, freq_scale, corr_dims, i0, ext_factor, attn_factor, &cos_theta, &sin_theta
                         );
+                        sin_theta *= sin_sign;
 
                         theta_base *= theta_scale;
 
@@ -11222,6 +11245,7 @@ static void ggml_compute_forward_rope_f16(
                                 theta_base, freq_scale, corr_dims, cur_rot, ext_factor, attn_factor,
                                 &cos_theta, &sin_theta
                             );
+                            sin_theta *= sin_sign;
 
                             theta_base *= theta_scale;
 
@@ -11251,11 +11275,11 @@ static void ggml_compute_forward_rope(
     switch (src0->type) {
         case GGML_TYPE_F16:
             {
-                ggml_compute_forward_rope_f16(params, src0, src1, dst);
+                ggml_compute_forward_rope_f16(params, src0, src1, dst, true);
             } break;
         case GGML_TYPE_F32:
             {
-                ggml_compute_forward_rope_f32(params, src0, src1, dst);
+                ggml_compute_forward_rope_f32(params, src0, src1, dst, true);
             } break;
         default:
             {
@@ -11266,216 +11290,6 @@ static void ggml_compute_forward_rope(
 
 // ggml_compute_forward_rope_back
 
-static void ggml_compute_forward_rope_back_f32(
-        const struct ggml_compute_params * params,
-        const struct ggml_tensor * src0,
-        const struct ggml_tensor * src1,
-        struct ggml_tensor * dst) {
-
-    if (params->type == GGML_TASK_INIT || params->type == GGML_TASK_FINALIZE) {
-        return;
-    }
-
-    // y = rope(x, src1)
-    // dx = rope_back(dy, src1)
-    // src0 is dy, src1 contains options
-
-    float freq_base;
-    float freq_scale;
-
-    // these two only relevant for xPos RoPE:
-    float xpos_base;
-    bool xpos_down;
-
-    //const int n_past = ((int32_t *) dst->op_params)[0];
-    const int n_dims = ((int32_t *) dst->op_params)[1];
-    const int mode   = ((int32_t *) dst->op_params)[2];
-    const int n_ctx  = ((int32_t *) dst->op_params)[3]; UNUSED(n_ctx);
-    memcpy(&freq_base,  (int32_t *) dst->op_params + 4, sizeof(float));
-    memcpy(&freq_scale, (int32_t *) dst->op_params + 5, sizeof(float));
-    memcpy(&xpos_base,  (int32_t *) dst->op_params + 6, sizeof(float));
-    memcpy(&xpos_down,  (int32_t *) dst->op_params + 7, sizeof(bool));
-
-    GGML_TENSOR_UNARY_OP_LOCALS
-
-    //printf("ne0: %d, ne1: %d, ne2: %d, ne3: %d\n", ne0, ne1, ne2, ne3);
-    //printf("n_past = %d, ne2 = %d\n", n_past, ne2);
-
-    assert(nb0 == sizeof(float));
-
-    const int ith = params->ith;
-    const int nth = params->nth;
-
-    const int nr = ggml_nrows(dst);
-
-    // rows per thread
-    const int dr = (nr + nth - 1)/nth;
-
-    // row range for this thread
-    const int ir0 = dr*ith;
-    const int ir1 = MIN(ir0 + dr, nr);
-
-    // row index used to determine which thread to use
-    int ir = 0;
-
-    const float theta_scale = powf(freq_base, -2.0f/n_dims);
-
-    const bool is_neox = mode & 2;
-
-    const int32_t * pos = (const int32_t *) src1->data;
-
-    for (int64_t i3 = 0; i3 < ne3; i3++) {
-        for (int64_t i2 = 0; i2 < ne2; i2++) {
-            const int64_t p = pos[i2];
-            for (int64_t i1 = 0; i1 < ne1; i1++) {
-                if (ir++ < ir0) continue;
-                if (ir   > ir1) break;
-
-                float theta_base = freq_scale * (float)p;
-
-                if (!is_neox) {
-                    for (int64_t i0 = 0; i0 < ne0; i0 += 2) {
-                        const float cos_theta = cosf(theta_base);
-                        const float sin_theta = sinf(theta_base);
-
-                        // zeta scaling for xPos only:
-                        float zeta = xpos_base != 0.0f ? powf((i0 + 0.4f * ne0) / (1.4f * ne0), p / xpos_base) : 1.0f;
-                        if (xpos_down) zeta = 1.0f / zeta;
-
-                        theta_base *= theta_scale;
-
-                        const float * const dy  = (float *)((char *) src0->data + i3*nb03 + i2*nb02 + i1*nb01 + i0*nb00);
-                              float *       dx  = (float *)((char *)  dst->data + i3*nb3  + i2*nb2  + i1*nb1  + i0*nb0);
-
-                        const float dy0 = dy[0];
-                        const float dy1 = dy[1];
-
-                        dx[0] =   dy0*cos_theta*zeta + dy1*sin_theta*zeta;
-                        dx[1] = - dy0*sin_theta*zeta + dy1*cos_theta*zeta;
-                    }
-                } else {
-                    for (int64_t ib = 0; ib < ne0/n_dims; ++ib) {
-                        for (int64_t ic = 0; ic < n_dims; ic += 2) {
-                            const float cos_theta = cosf(theta_base);
-                            const float sin_theta = sinf(theta_base);
-
-                            theta_base *= theta_scale;
-
-                            const int64_t i0 = ib*n_dims + ic/2;
-
-                            const float * const dy  = (float *)((char *) src0->data + i3*nb03 + i2*nb02 + i1*nb01 + i0*nb00);
-                                  float *       dx  = (float *)((char *)  dst->data + i3*nb3  + i2*nb2  + i1*nb1  + i0*nb0);
-
-                            const float dy0 = dy[0];
-                            const float dy1 = dy[n_dims/2];
-
-                            dx[0]        =   dy0*cos_theta + dy1*sin_theta;
-                            dx[n_dims/2] = - dy0*sin_theta + dy1*cos_theta;
-                        }
-                    }
-                }
-            }
-        }
-    }
-}
-
-static void ggml_compute_forward_rope_back_f16(
-        const struct ggml_compute_params * params,
-        const struct ggml_tensor * src0,
-        const struct ggml_tensor * src1,
-        struct ggml_tensor * dst) {
-
-    if (params->type == GGML_TASK_INIT || params->type == GGML_TASK_FINALIZE) {
-        return;
-    }
-
-    // y = rope(x, src1)
-    // dx = rope_back(dy, src1)
-    // src0 is dy, src1 contains options
-
-    //const int n_past = ((int32_t *) dst->op_params)[0];
-    const int n_dims = ((int32_t *) dst->op_params)[1];
-    const int mode   = ((int32_t *) dst->op_params)[2];
-
-    GGML_TENSOR_UNARY_OP_LOCALS
-
-    //printf("ne0: %d, ne1: %d, ne2: %d, ne3: %d\n", ne0, ne1, ne2, ne3);
-    //printf("n_past = %d, ne2 = %d\n", n_past, ne2);
-
-    assert(nb0 == sizeof(ggml_fp16_t));
-
-    const int ith = params->ith;
-    const int nth = params->nth;
-
-    const int nr = ggml_nrows(dst);
-
-    // rows per thread
-    const int dr = (nr + nth - 1)/nth;
-
-    // row range for this thread
-    const int ir0 = dr*ith;
-    const int ir1 = MIN(ir0 + dr, nr);
-
-    // row index used to determine which thread to use
-    int ir = 0;
-
-    const float theta_scale = powf(10000.0, -2.0f/n_dims);
-
-    const bool is_neox = mode & 2;
-
-    const int32_t * pos = (const int32_t *) src1->data;
-
-    for (int64_t i3 = 0; i3 < ne3; i3++) {
-        for (int64_t i2 = 0; i2 < ne2; i2++) {
-            const int64_t p = pos[i2];
-            for (int64_t i1 = 0; i1 < ne1; i1++) {
-                if (ir++ < ir0) continue;
-                if (ir   > ir1) break;
-
-                float theta_base = (float)p;
-
-                if (!is_neox) {
-                    for (int64_t i0 = 0; i0 < ne0; i0 += 2) {
-                        const float cos_theta = cosf(theta_base);
-                        const float sin_theta = sinf(theta_base);
-
-                        theta_base *= theta_scale;
-
-                        const ggml_fp16_t * const dy  = (ggml_fp16_t *)((char *) src0->data + i3*nb03 + i2*nb02 + i1*nb01 + i0*nb00);
-                              ggml_fp16_t *       dx  = (ggml_fp16_t *)((char *)  dst->data + i3*nb3  + i2*nb2  + i1*nb1  + i0*nb0);
-
-                        const float dy0 = GGML_FP16_TO_FP32(dy[0]);
-                        const float dy1 = GGML_FP16_TO_FP32(dy[1]);
-
-                        dx[0] = GGML_FP32_TO_FP16( dy0*cos_theta + dy1*sin_theta);
-                        dx[1] = GGML_FP32_TO_FP16(-dy0*sin_theta + dy1*cos_theta);
-                    }
-                } else {
-                    for (int64_t ib = 0; ib < ne0/n_dims; ++ib) {
-                        for (int64_t ic = 0; ic < n_dims; ic += 2) {
-                            const float cos_theta = cosf(theta_base);
-                            const float sin_theta = sinf(theta_base);
-
-                            theta_base *= theta_scale;
-
-                            const int64_t i0 = ib*n_dims + ic/2;
-
-                            const ggml_fp16_t * const dy  = (ggml_fp16_t *)((char *) src0->data + i3*nb03 + i2*nb02 + i1*nb01 + i0*nb00);
-                                  ggml_fp16_t *       dx  = (ggml_fp16_t *)((char *)  dst->data + i3*nb3  + i2*nb2  + i1*nb1  + i0*nb0);
-
-                            const float dy0 = GGML_FP16_TO_FP32(dy[0]);
-                            const float dy1 = GGML_FP16_TO_FP32(dy[n_dims/2]);
-
-                            dx[0]        = GGML_FP32_TO_FP16( dy0*cos_theta + dy1*sin_theta);
-                            dx[n_dims/2] = GGML_FP32_TO_FP16(-dy0*sin_theta + dy1*cos_theta);
-                        }
-                    }
-                }
-            }
-        }
-    }
-}
-
 static void ggml_compute_forward_rope_back(
         const struct ggml_compute_params * params,
         const struct ggml_tensor * src0,
@@ -11484,11 +11298,11 @@ static void ggml_compute_forward_rope_back(
     switch (src0->type) {
         case GGML_TYPE_F16:
             {
-                ggml_compute_forward_rope_back_f16(params, src0, src1, dst);
+                ggml_compute_forward_rope_f16(params, src0, src1, dst, false);
             } break;
         case GGML_TYPE_F32:
             {
-                ggml_compute_forward_rope_back_f32(params, src0, src1, dst);
+                ggml_compute_forward_rope_f32(params, src0, src1, dst, false);
             } break;
         default:
             {
@@ -14923,17 +14737,20 @@ static void ggml_compute_backward(struct ggml_context * ctx, struct ggml_tensor
                 // necessary for llama
                 if (src0->grad) {
                     //const int n_past = ((int32_t *) tensor->op_params)[0];
-                    const int n_dims = ((int32_t *) tensor->op_params)[1];
+                    const int n_dims     = ((int32_t *) tensor->op_params)[1];
-                    const int mode   = ((int32_t *) tensor->op_params)[2];
+                    const int mode       = ((int32_t *) tensor->op_params)[2];
-                    const int n_ctx  = ((int32_t *) tensor->op_params)[3];
+                    const int n_ctx      = ((int32_t *) tensor->op_params)[3];
-                    float freq_base;
+                    const int n_orig_ctx = ((int32_t *) tensor->op_params)[4];
-                    float freq_scale;
+                    float freq_base, freq_scale, ext_factor, attn_factor, beta_fast, beta_slow, xpos_base, xpos_down;
-                    float xpos_base;
+
-                    bool  xpos_down;
+                    memcpy(&freq_base,   (int32_t *) tensor->op_params +  5, sizeof(float));
-                    memcpy(&freq_base,  (int32_t *) tensor->op_params + 4, sizeof(float));
+                    memcpy(&freq_scale,  (int32_t *) tensor->op_params +  6, sizeof(float));
-                    memcpy(&freq_scale, (int32_t *) tensor->op_params + 5, sizeof(float));
+                    memcpy(&ext_factor,  (int32_t *) tensor->op_params +  7, sizeof(float));
-                    memcpy(&xpos_base,  (int32_t *) tensor->op_params + 6, sizeof(float));
+                    memcpy(&attn_factor, (int32_t *) tensor->op_params +  8, sizeof(float));
-                    memcpy(&xpos_down,  (int32_t *) tensor->op_params + 7, sizeof(bool));
+                    memcpy(&beta_fast,   (int32_t *) tensor->op_params +  9, sizeof(float));
+                    memcpy(&beta_slow,   (int32_t *) tensor->op_params + 10, sizeof(float));
+                    memcpy(&xpos_base,   (int32_t *) tensor->op_params + 11, sizeof(float));
+                    memcpy(&xpos_down,   (int32_t *) tensor->op_params + 12, sizeof(bool));
 
                     src0->grad = ggml_add_or_set(ctx,
                             src0->grad,
@@ -14943,8 +14760,13 @@ static void ggml_compute_backward(struct ggml_context * ctx, struct ggml_tensor
                                 n_dims,
                                 mode,
                                 n_ctx,
+                                n_orig_ctx,
                                 freq_base,
                                 freq_scale,
+                                ext_factor,
+                                attn_factor,
+                                beta_fast,
+                                beta_slow,
                                 xpos_base,
                                 xpos_down),
                             zero_table);
@@ -14954,17 +14776,20 @@ static void ggml_compute_backward(struct ggml_context * ctx, struct ggml_tensor
             {
                 if (src0->grad) {
                     //const int n_past = ((int32_t *) tensor->op_params)[0];
-                    const int n_dims = ((int32_t *) tensor->op_params)[1];
+                    const int n_dims     = ((int32_t *) tensor->op_params)[1];
-                    const int mode   = ((int32_t *) tensor->op_params)[2];
+                    const int mode       = ((int32_t *) tensor->op_params)[2];
-                    const int n_ctx  = ((int32_t *) tensor->op_params)[3];
+                    const int n_ctx      = ((int32_t *) tensor->op_params)[3];
-                    float freq_base;
+                    const int n_orig_ctx = ((int32_t *) tensor->op_params)[4];
-                    float freq_scale;
+                    float freq_base, freq_scale, ext_factor, attn_factor, beta_fast, beta_slow, xpos_base, xpos_down;
-                    float xpos_base;
+
-                    bool  xpos_down;
+                    memcpy(&freq_base,   (int32_t *) tensor->op_params +  5, sizeof(float));
-                    memcpy(&freq_base,  (int32_t *) tensor->op_params + 4, sizeof(float));
+                    memcpy(&freq_scale,  (int32_t *) tensor->op_params +  6, sizeof(float));
-                    memcpy(&freq_scale, (int32_t *) tensor->op_params + 5, sizeof(float));
+                    memcpy(&ext_factor,  (int32_t *) tensor->op_params +  7, sizeof(float));
-                    memcpy(&xpos_base,  (int32_t *) tensor->op_params + 6, sizeof(float));
+                    memcpy(&attn_factor, (int32_t *) tensor->op_params +  8, sizeof(float));
-                    memcpy(&xpos_down,  (int32_t *) tensor->op_params + 7, sizeof(bool));
+                    memcpy(&beta_fast,   (int32_t *) tensor->op_params +  9, sizeof(float));
+                    memcpy(&beta_slow,   (int32_t *) tensor->op_params + 10, sizeof(float));
+                    memcpy(&xpos_base,   (int32_t *) tensor->op_params + 11, sizeof(float));
+                    memcpy(&xpos_down,   (int32_t *) tensor->op_params + 12, sizeof(bool));
 
                     src0->grad = ggml_add_or_set(ctx,
                             src0->grad,
@@ -14973,14 +14798,14 @@ static void ggml_compute_backward(struct ggml_context * ctx, struct ggml_tensor
                                 src1,
                                 n_dims,
                                 mode,
-                                0,
                                 n_ctx,
+                                n_orig_ctx,
                                 freq_base,
                                 freq_scale,
-                                0.0f,
+                                ext_factor,
-                                1.0f,
+                                attn_factor,
-                                0.0f,
+                                beta_fast,
-                                0.0f,
+                                beta_slow,
                                 xpos_base,
                                 xpos_down,
                                 false),
@@ -18248,7 +18073,7 @@ struct gguf_context * gguf_init_from_file(const char * fname, struct gguf_init_p
     {
         ctx->kv = malloc(ctx->header.n_kv * sizeof(struct gguf_kv));
 
-        for (uint32_t i = 0; i < ctx->header.n_kv; ++i) {
+        for (uint64_t i = 0; i < ctx->header.n_kv; ++i) {
             struct gguf_kv * kv = &ctx->kv[i];
 
             //fprintf(stderr, "%s: reading kv %d\n", __func__, i);
@@ -18295,7 +18120,7 @@ struct gguf_context * gguf_init_from_file(const char * fname, struct gguf_init_p
                             case GGUF_TYPE_STRING:
                                 {
                                     kv->value.arr.data = malloc(kv->value.arr.n * sizeof(struct gguf_str));
-                                    for (uint32_t j = 0; j < kv->value.arr.n; ++j) {
+                                    for (uint64_t j = 0; j < kv->value.arr.n; ++j) {
                                         ok = ok && gguf_fread_str(file, &((struct gguf_str *) kv->value.arr.data)[j], &offset);
                                     }
                                 } break;
@@ -18323,7 +18148,7 @@ struct gguf_context * gguf_init_from_file(const char * fname, struct gguf_init_p
     {
         ctx->infos = malloc(ctx->header.n_tensors * sizeof(struct gguf_tensor_info));
 
-        for (uint32_t i = 0; i < ctx->header.n_tensors; ++i) {
+        for (uint64_t i = 0; i < ctx->header.n_tensors; ++i) {
             struct gguf_tensor_info * info = &ctx->infos[i];
 
             for (int j = 0; j < GGML_MAX_DIMS; ++j) {
@@ -18370,7 +18195,7 @@ struct gguf_context * gguf_init_from_file(const char * fname, struct gguf_init_p
     // compute the total size of the data section, taking into account the alignment
     {
         ctx->size = 0;
-        for (uint32_t i = 0; i < ctx->header.n_tensors; ++i) {
+        for (uint64_t i = 0; i < ctx->header.n_tensors; ++i) {
             struct gguf_tensor_info * info = &ctx->infos[i];
 
             const int64_t ne =
@@ -18439,7 +18264,7 @@ struct gguf_context * gguf_init_from_file(const char * fname, struct gguf_init_p
         ggml_set_no_alloc(ctx_data, true);
 
         // create the tensors
-        for (uint32_t i = 0; i < ctx->header.n_tensors; ++i) {
+        for (uint64_t i = 0; i < ctx->header.n_tensors; ++i) {
             const int64_t ne[GGML_MAX_DIMS] = {
                 ctx->infos[i].ne[0],
                 ctx->infos[i].ne[1],

ggml.h

@@ -1371,8 +1371,13 @@ extern "C" {
             int                   n_dims,
             int                   mode,
             int                   n_ctx,
+            int                   n_orig_ctx,
             float                 freq_base,
             float                 freq_scale,
+            float                 ext_factor,
+            float                 attn_factor,
+            float                 beta_fast,
+            float                 beta_slow,
             float                 xpos_base,
             bool                  xpos_down);
 

whisper.cpp

@@ -1732,22 +1732,20 @@ static struct ggml_cgraph * whisper_build_graph_conv(
         // convolution + gelu
         {
             cur = ggml_conv_1d_ph(ctx0, model.e_conv_1_w, mel, 1, 1);
-            cur = ggml_add(ctx0, cur, model.e_conv_1_b);
+            if (n_ctx == hparams.n_audio_ctx) {
-            //cur = ggml_add(ctx0,
+                cur = ggml_add(ctx0, cur, model.e_conv_1_b);
-            //        ggml_repeat(ctx0,
+            } else {
-            //            model.e_conv_1_b,
+                cur = ggml_add(ctx0, cur, ggml_cont(ctx0, ggml_view_2d(ctx0, model.e_conv_1_b, cur->ne[0], cur->ne[1], model.e_conv_1_b->nb[1], 0)));
-            //            cur),
+            }
-            //        cur);
 
             cur = ggml_gelu(ctx0, cur);
 
             cur = ggml_conv_1d_ph(ctx0, model.e_conv_2_w, cur, 2, 1);
-            cur = ggml_add(ctx0, cur, model.e_conv_2_b);
+            if (n_ctx == hparams.n_audio_ctx) {
-            //cur = ggml_add(ctx0,
+                cur = ggml_add(ctx0, cur, model.e_conv_2_b);
-            //        ggml_repeat(ctx0,
+            } else {
-            //            model.e_conv_2_b,
+                cur = ggml_add(ctx0, cur, ggml_cont(ctx0, ggml_view_2d(ctx0, model.e_conv_2_b, cur->ne[0], cur->ne[1], model.e_conv_2_b->nb[1], 0)));
-            //            cur),
+            }
-            //        cur);
 
             cur = ggml_gelu(ctx0, cur);
         }
@@ -3527,7 +3525,7 @@ int whisper_encode(struct whisper_context * ctx, int offset, int n_threads) {
 int whisper_decode_with_state(struct whisper_context * ctx, struct whisper_state * state, const whisper_token * tokens, int n_tokens, int n_past, int n_threads) {
     whisper_batch_prep_legacy(state->batch, tokens, n_tokens, n_past, 0);
 
-    whisper_kv_cache_seq_rm(ctx->state->kv_self, 0, n_past, -1);
+    whisper_kv_cache_seq_rm(state->kv_self, 0, n_past, -1);
 
     if (!whisper_decode_internal(*ctx, *state, state->batch, n_threads, nullptr, nullptr)) {
         WHISPER_LOG_ERROR("%s: failed to eval\n", __func__);
@@ -3540,19 +3538,10 @@ int whisper_decode_with_state(struct whisper_context * ctx, struct whisper_state
 int whisper_decode(struct whisper_context * ctx, const whisper_token * tokens, int n_tokens, int n_past, int n_threads) {
     if (ctx->state == nullptr) {
         WHISPER_LOG_ERROR("%s: ERROR state was not loaded.\n", __func__);
-        return false;
+        return -1;
     }
 
-    whisper_kv_cache_seq_rm(ctx->state->kv_self, 0, n_past, -1);
+    return whisper_decode_with_state(ctx, ctx->state, tokens, n_tokens, n_past, n_threads);
-
-    whisper_batch_prep_legacy(ctx->state->batch, tokens, n_tokens, n_past, 0);
-
-    if (!whisper_decode_internal(*ctx, *ctx->state, ctx->state->batch, n_threads, nullptr, nullptr)) {
-        WHISPER_LOG_ERROR("%s: failed to eval\n", __func__);
-        return 1;
-    }
-
-    return 0;
 }
 
 int whisper_tokenize(struct whisper_context * ctx, const char * text, whisper_token * tokens, int n_max_tokens) {
@@ -5188,7 +5177,7 @@ int whisper_full_with_state(
             const int progress_cur = (100*(seek - seek_start))/(seek_end - seek_start);
 
             params.progress_callback(
-                ctx, ctx->state, progress_cur, params.progress_callback_user_data);
+                ctx, state, progress_cur, params.progress_callback_user_data);
         }
 
         // of only 1 second left, then stop

whisper.h

@@ -50,7 +50,9 @@ extern "C" {
     //
     //     ...
     //
-    //     struct whisper_context * ctx = whisper_init_from_file("/path/to/ggml-base.en.bin");
+    //     whisper_context_params cparams = whisper_context_default_params();
+    // 
+    //     struct whisper_context * ctx = whisper_init_from_file_with_params("/path/to/ggml-base.en.bin", cparams);
     //
     //     if (whisper_full(ctx, wparams, pcmf32.data(), pcmf32.size()) != 0) {
     //         fprintf(stderr, "failed to process audio\n");