whisper.cpp/bindings/javascript/emscripten.cpp

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#include "whisper.h"
#include <emscripten.h>
#include <emscripten/bind.h>
#include <vector>
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#include <thread>
std::thread g_worker;
std::vector<struct whisper_context *> g_contexts(4, nullptr);
EMSCRIPTEN_BINDINGS(whisper) {
emscripten::function("init", emscripten::optional_override([](const std::string & path_model) {
if (g_worker.joinable()) {
g_worker.join();
}
for (size_t i = 0; i < g_contexts.size(); ++i) {
if (g_contexts[i] == nullptr) {
g_contexts[i] = whisper_init(path_model.c_str());
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if (g_contexts[i] != nullptr) {
return i + 1;
} else {
return (size_t) 0;
}
}
}
return (size_t) 0;
}));
emscripten::function("free", emscripten::optional_override([](size_t index) {
if (g_worker.joinable()) {
g_worker.join();
}
--index;
if (index < g_contexts.size()) {
whisper_free(g_contexts[index]);
g_contexts[index] = nullptr;
}
}));
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emscripten::function("full_default", emscripten::optional_override([](size_t index, const emscripten::val & audio, const std::string & lang, bool translate) {
if (g_worker.joinable()) {
g_worker.join();
}
--index;
if (index >= g_contexts.size()) {
return -1;
}
if (g_contexts[index] == nullptr) {
return -2;
}
struct whisper_full_params params = whisper_full_default_params(whisper_sampling_strategy::WHISPER_SAMPLING_GREEDY);
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params.print_realtime = true;
params.print_progress = false;
params.print_timestamps = true;
params.print_special = false;
params.translate = translate;
params.language = whisper_is_multilingual(g_contexts[index]) ? lang.c_str() : "en";
params.n_threads = std::min(8, (int) std::thread::hardware_concurrency());
params.offset_ms = 0;
std::vector<float> pcmf32;
const int n = audio["length"].as<int>();
emscripten::val heap = emscripten::val::module_property("HEAPU8");
emscripten::val memory = heap["buffer"];
pcmf32.resize(n);
emscripten::val memoryView = audio["constructor"].new_(memory, reinterpret_cast<uintptr_t>(pcmf32.data()), n);
memoryView.call<void>("set", audio);
// print system information
{
printf("system_info: n_threads = %d / %d | %s\n",
params.n_threads, std::thread::hardware_concurrency(), whisper_print_system_info());
printf("%s: processing %d samples, %.1f sec, %d threads, %d processors, lang = %s, task = %s ...\n",
__func__, int(pcmf32.size()), float(pcmf32.size())/WHISPER_SAMPLE_RATE,
params.n_threads, 1,
params.language,
params.translate ? "translate" : "transcribe");
printf("\n");
}
// run the worker
{
g_worker = std::thread([index, params, pcmf32 = std::move(pcmf32)]() {
whisper_reset_timings(g_contexts[index]);
whisper_full(g_contexts[index], params, pcmf32.data(), pcmf32.size());
whisper_print_timings(g_contexts[index]);
});
}
return 0;
}));
}