ExternalVendorCode/whisper.cpp
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Prompt previous tokens for streaming (#163)

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* feat: prompt previous tokens for streaming

I used a vector pointer instead of vector itself because it gave weird errors, and why not

* convert vector to use with C api

* feat: remove old refs, check for prompt size

* feat: use better way of getting the pointer
This commit is contained in:
M. Eren Akbiyik 2022-11-22 17:10:35 +01:00 committed by GitHub
parent 78116f8eda
commit 63ae03b8e0
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3 changed files with 33 additions and 0 deletions
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14
examples/stream/stream.cpp
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@ -234,6 +234,7 @@ int main(int argc, char ** argv) {
std::vector<float> pcmf32(n_samples_30s, 0.0f);
std::vector<float> pcmf32_old;
std::vector<whisper_token> prompt_tokens;
const int n_new_line = params.length_ms / params.step_ms - 1;
// print some info about the processing
@ -344,6 +345,9 @@ int main(int argc, char ** argv) {
wparams.audio_ctx = params.audio_ctx;
wparams.speed_up = params.speed_up;
wparams.prompt_tokens = prompt_tokens.data();
wparams.prompt_n_tokens = prompt_tokens.size();
if (whisper_full(ctx, wparams, pcmf32.data(), pcmf32.size()) != 0) {
fprintf(stderr, "%s: failed to process audio\n", argv[0]);
return 6;
@ -393,6 +397,16 @@ int main(int argc, char ** argv) {
// keep part of the audio for next iteration to try to mitigate word boundary issues
pcmf32_old = std::vector<float>(pcmf32.end() - n_samples_keep, pcmf32.end());
// Add tokens of the last full length segment as the prompt
prompt_tokens.clear();
const int n_segments = whisper_full_n_segments(ctx);
for (int i = 0; i < n_segments; ++i) {
const int token_count = whisper_full_n_tokens(ctx, i);
for (int j = 0; j < token_count; ++j) {
prompt_tokens.push_back(whisper_full_get_token_id(ctx, i, j));
}
}
}
}
}

15
whisper.cpp
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@ -2412,6 +2412,9 @@ struct whisper_full_params whisper_full_default_params(enum whisper_sampling_str
/*.speed_up =*/ false,
/*.audio_ctx =*/ 0,
/*.prompt_tokens =*/ nullptr,
/*.prompt_n_tokens =*/ 0,
/*.language =*/ "en",
/*.greedy =*/ {
@ -2455,6 +2458,9 @@ struct whisper_full_params whisper_full_default_params(enum whisper_sampling_str
/*.speed_up =*/ false,
/*.audio_ctx =*/ 0,
/*.prompt_tokens =*/ nullptr,
/*.prompt_n_tokens =*/ 0,
/*.language =*/ "en",
/*.greedy =*/ {
@ -2584,6 +2590,15 @@ int whisper_full(
prompt_past.clear();
}
// Prepend the prompt tokens to the prompt_past
if (params.prompt_tokens && params.prompt_n_tokens > 0) {
// Parse tokens from the pointer (it points to an std::vector)
for (int i = 0; i < params.prompt_n_tokens; i++) {
prompt_past.push_back(params.prompt_tokens[i]);
}
std::rotate(prompt_past.begin(), prompt_past.end() - params.prompt_n_tokens, prompt_past.end());
}
// overwrite audio_ctx
ctx->exp_n_audio_ctx = params.audio_ctx;

4
whisper.h
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@ -208,6 +208,10 @@ extern "C" {
bool speed_up; // speed-up the audio by 2x using Phase Vocoder
int audio_ctx; // overwrite the audio context size (0 = use default)
// std::vector<whisper_token>: tokens to provide the whisper model as initial prompt
const whisper_token * prompt_tokens;
int prompt_n_tokens;
const char * language;
struct {