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whisper : respect offset_ms in language auto-detection 

The auto-detect call in whisper_full_with_state passed a hard-coded
offset of 0 to whisper_lang_auto_detect_with_state, so language
detection always analyzed the first window of audio regardless of
the caller's offset_ms. On audio like "1 minute of French then 30
minutes of German" with offset_ms=60000, transcription correctly
started at the 1-minute mark but language detection still returned
French from the prefix.

Pass params.offset_ms through. Auto-detect now reads the same window
that decoding will start from.

Fixes #1831
This commit is contained in:
Achyut Krishna Byanjankar 2026-04-18 17:56:58 -07:00
parent 166c20b473
commit ccfea358a8
1 changed files with 15 additions and 1 deletions
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src/whisper.cpp
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@ -6812,7 +6812,21 @@ int whisper_full_with_state(
if (params.language == nullptr || strlen(params.language) == 0 || strcmp(params.language, "auto") == 0 || params.detect_language) {
std::vector<float> probs(whisper_lang_max_id() + 1, 0.0f);
const auto lang_id = whisper_lang_auto_detect_with_state(ctx, state, 0, params.n_threads, probs.data());
// Respect the user's offset_ms when choosing the window for language
// detection. Previously this was hardcoded to 0, which meant that on
// audio like "1 minute of French then 30 minutes of German" with
// offset_ms=60000, transcription correctly started at the 1-minute
// mark but language detection still picked the French prefix.
// If the offset falls past the end of the audio (including short
// files where offset_ms exceeds total duration), fall back to 0 so
// auto-detect still returns a valid language. The too-short-audio
// guard later in this function will then handle the empty-decode
// case cleanly.
// ref: https://github.com/ggml-org/whisper.cpp/issues/1831
const int detect_offset_ms = (params.offset_ms > 0 && (params.offset_ms / 10) < state->mel.n_len_org)
? params.offset_ms
: 0;
const auto lang_id = whisper_lang_auto_detect_with_state(ctx, state, detect_offset_ms, params.n_threads, probs.data());
if (lang_id < 0) {
WHISPER_LOG_ERROR("%s: failed to auto-detect language\n", __func__);
return -3;