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whisper.cpp
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Add DTW token timestamps

This commit is contained in:
obvirm 2025-12-30 15:55:19 +07:00
parent 6114e69213
commit 543dabe25a
1 changed files with 164 additions and 5 deletions
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169
src/whisper.cpp
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@ -7695,7 +7695,7 @@ int whisper_full_with_state(
whisper_exp_compute_token_level_timestamps(
*ctx, *state, result_all.size() - 1, params.thold_pt, params.thold_ptsum);
if (params.max_len > 0) {
if (params.max_len > 0 && !ctx->params.dtw_token_timestamps) {
n_new = whisper_wrap_segment(*ctx, *state, params.max_len, params.split_on_word);
}
}
@ -7708,15 +7708,14 @@ int whisper_full_with_state(
// FIXME: will timestamp offsets be correct?
// [EXPERIMENTAL] Token-level timestamps with DTW
{
const int n_segments = state->result_all.size() - n_segments_before;
int n_segments = state->result_all.size() - n_segments_before;
if (ctx->params.dtw_token_timestamps && n_segments) {
const int n_frames = std::min(std::min(WHISPER_CHUNK_SIZE * 100, seek_delta), seek_end - seek);
whisper_exp_compute_token_level_timestamps_dtw(
ctx, state, params, result_all.size() - n_segments, n_segments, seek, n_frames, 7, params.n_threads);
if (params.new_segment_callback) {
for (int seg = (int) result_all.size() - n_segments; seg < n_segments; seg++) {
params.new_segment_callback(ctx, state, seg, params.new_segment_callback_user_data);
}
params.new_segment_callback(ctx, state, n_segments, params.new_segment_callback_user_data);
}
}
}
@ -8949,6 +8948,166 @@ static void whisper_exp_compute_token_level_timestamps_dtw(
}
}
// adjust timestamps
const int64_t min_dur = 5;
for (size_t i = i_segment; i < i_segment + n_segments; ++i) {
auto & segment = state->result_all[i];
const int n_tokens = segment.tokens.size();
for (int t = 0; t < n_tokens; ++t) {
auto & tok = segment.tokens[t];
if (tok.id >= whisper_token_eot(ctx)) continue;
int len = 1;
const char * text = whisper_token_to_str(ctx, tok.id);
if (text) {
len = (int)strlen(text);
if (len > 0 && text[0] == ' ') {
text++;
len--;
}
}
// onset shift
{
int shift = 0;
if (len > 0 && text) {
char c = tolower(text[0]);
if (strchr("aeiouywbcdgkpqqt", c)) {
shift = 15;
} else if (c >= 'a' && c <= 'z') {
shift = 8;
}
}
if (shift > 0) {
int64_t prev_end = 0;
if (t > 0) {
for (int t2 = t - 1; t2 >= 0; --t2) {
if (segment.tokens[t2].id < whisper_token_eot(ctx)) {
prev_end = segment.tokens[t2].t_dtw;
break;
}
}
} else if (i > 0 && !state->result_all[i-1].tokens.empty()) {
prev_end = state->result_all[i-1].tokens.back().t_dtw;
}
if (tok.t_dtw - shift > prev_end + 1) {
tok.t_dtw -= shift;
}
}
}
// min duration
{
int64_t next_t_dtw = -1;
for (int t2 = t + 1; t2 < n_tokens; ++t2) {
if (segment.tokens[t2].id < whisper_token_eot(ctx)) {
next_t_dtw = segment.tokens[t2].t_dtw;
break;
}
}
if (next_t_dtw < 0) {
next_t_dtw = segment.t1;
}
int64_t duration = next_t_dtw - tok.t_dtw;
const int64_t adaptive_min = std::max((int64_t)5, (int64_t)(len * 2));
if (duration < adaptive_min && duration >= 0) {
int64_t needed = adaptive_min - duration;
int64_t prev_end = 0;
if (t > 0) {
for (int t2 = t - 1; t2 >= 0; --t2) {
if (segment.tokens[t2].id < whisper_token_eot(ctx)) {
prev_end = segment.tokens[t2].t_dtw;
break;
}
}
} else if (i > 0 && !state->result_all[i-1].tokens.empty()) {
prev_end = state->result_all[i-1].tokens.back().t_dtw;
}
int64_t new_start = tok.t_dtw - needed;
if (new_start > prev_end + 2) {
tok.t_dtw = new_start;
}
}
}
}
}
// propagate to t0/t1
for (size_t i = i_segment; i < i_segment + n_segments; ++i) {
auto & segment = state->result_all[i];
const int n_tokens = segment.tokens.size();
for (int t = 0; t < n_tokens; ++t) {
auto & tok = segment.tokens[t];
if (tok.id >= whisper_token_eot(ctx)) continue;
tok.t0 = tok.t_dtw;
int64_t next_t_dtw = -1;
for (int t2 = t + 1; t2 < n_tokens; ++t2) {
if (segment.tokens[t2].id < whisper_token_eot(ctx)) {
next_t_dtw = segment.tokens[t2].t_dtw;
break;
}
}
if (next_t_dtw < 0 && i + 1 < state->result_all.size()) {
for (const auto & ntok : state->result_all[i + 1].tokens) {
if (ntok.id < whisper_token_eot(ctx)) {
next_t_dtw = ntok.t_dtw;
break;
}
}
}
int64_t raw_t1 = (next_t_dtw >= 0) ? next_t_dtw : segment.t1;
// max duration
{
int len = 1;
const char * text = whisper_token_to_str(ctx, tok.id);
if (text) {
len = (int)strlen(text);
if (len > 0 && text[0] == ' ') len--;
if (len < 1) len = 1;
}
int64_t max_dur = std::max((int64_t)10, (int64_t)(len * 15));
if (raw_t1 < tok.t0 + min_dur) {
raw_t1 = tok.t0 + min_dur;
}
tok.t1 = (raw_t1 - tok.t0 > max_dur) ? tok.t0 + max_dur : raw_t1;
}
}
// segment bounds
{
int64_t first_t0 = -1;
int64_t last_t1 = -1;
for (int t = 0; t < n_tokens; ++t) {
const auto & tok = segment.tokens[t];
if (tok.id >= whisper_token_eot(ctx)) continue;
if (first_t0 < 0) first_t0 = tok.t0;
last_t1 = tok.t1;
}
if (first_t0 >= 0) segment.t0 = first_t0;
if (last_t1 >= 0) segment.t1 = last_t1;
}
}
// Print DTW timestamps
/*for (size_t i = i_segment; i < i_segment + n_segments; ++i) {
auto & segment = state->result_all[i];