ExternalVendorCode/whisper.cpp
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parallel : print time of audio boundaries + fix timings

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This commit is contained in:
Georgi Gerganov 2022-10-29 14:08:23 +03:00
parent e5044f87d9
commit dec40be58f
2 changed files with 41 additions and 12 deletions
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50
whisper.cpp
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@ -1910,14 +1910,19 @@ whisper_vocab::id whisper_sample_timestamp(
return probs_id[0].second;
}
static std::string to_timestamp(int64_t t) {
int64_t sec = t/100;
int64_t msec = t - sec*100;
int64_t min = sec/60;
sec = sec - min*60;
// 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.%03d", (int) min, (int) sec, (int) msec);
snprintf(buf, sizeof(buf), "%02d:%02d:%02d%s%03d", (int) hr, (int) min, (int) sec, comma ? "," : ".", (int) msec);
return std::string(buf);
}
@ -2727,25 +2732,46 @@ int whisper_full_parallel(
// combine results into ctx->result_all
for (int i = 0; i < n_processors - 1; ++i) {
auto & result_all = ctxs[i].result_all;
auto & results_i = ctxs[i].result_all;
for (int j = 0; j < (int) result_all.size(); ++j) {
result_all[j].t0 += 100*((i + 1)*n_samples_per_processor)/WHISPER_SAMPLE_RATE + offset_t;
result_all[j].t1 += 100*((i + 1)*n_samples_per_processor)/WHISPER_SAMPLE_RATE + offset_t;
for (int j = 0; j < (int) results_i.size(); ++j) {
// correct the segment timestamp taking into account the offset
results_i[j].t0 += 100*((i + 1)*n_samples_per_processor)/WHISPER_SAMPLE_RATE + offset_t;
results_i[j].t1 += 100*((i + 1)*n_samples_per_processor)/WHISPER_SAMPLE_RATE + offset_t;
// make sure that segments are not overlapping
if (ctx->result_all.size() > 0) {
result_all[j].t0 = std::max(result_all[j].t0, ctx->result_all.back().t1);
results_i[j].t0 = std::max(results_i[j].t0, ctx->result_all.back().t1);
}
ctx->result_all.push_back(std::move(result_all[j]));
ctx->result_all.push_back(std::move(results_i[j]));
// call the new_segment_callback for each segment
if (params.new_segment_callback) {
params.new_segment_callback(ctx, params.new_segment_callback_user_data);
}
}
ctx->t_mel_us += ctxs[i].t_mel_us;
ctx->t_sample_us += ctxs[i].t_sample_us;
ctx->t_encode_us += ctxs[i].t_encode_us;
ctx->t_decode_us += ctxs[i].t_decode_us;
}
// average the timings
ctx->t_mel_us /= n_processors;
ctx->t_sample_us /= n_processors;
ctx->t_encode_us /= n_processors;
ctx->t_decode_us /= n_processors;
// print information about the audio boundaries
fprintf(stderr, "\n");
fprintf(stderr, "%s: the audio has been split into %d chunks at the following times:\n", __func__, n_processors);
for (int i = 0; i < n_processors - 1; ++i) {
fprintf(stderr, "%s: split %d - %s\n", __func__, (i + 1), to_timestamp(100*((i + 1)*n_samples_per_processor)/WHISPER_SAMPLE_RATE + offset_t).c_str());
}
fprintf(stderr, "%s: the transcription quality may be degraded near these boundaries\n", __func__);
return ret;
}

3
whisper.h
View File

@ -213,6 +213,9 @@ extern "C" {
const float * samples,
int n_samples);
// Split the input audio in chunks and process each chunk separately using whisper_full()
// It seems this approach can offer some speedup in some cases.
// However, the transcription accuracy can be worse at the beginning and end of each chunk.
WHISPER_API int whisper_full_parallel(
struct whisper_context * ctx,
struct whisper_full_params params,