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commit 304efa29aeef68d4c8e2af5ab9763afe25819965 Author: Ayoub Nabil Boubagrat <[email protected]> AuthorDate: Sat Sep 5 12:56:25 2026 +0200 Commit: michaelni <[email protected]> CommitDate: Wed Sep 9 18:06:23 2026 +0000 avcodec/ac3dsp: skip the inner loop for single-bin bands calculate bap directly for the first 28 bands. each contains only one coefficient. Signed-off-by: Ayoub Nabil Boubagrat <[email protected]> --- libavcodec/ac3dsp.c | 12 ++++++++++-- 1 file changed, 10 insertions(+), 2 deletions(-) diff --git a/libavcodec/ac3dsp.c b/libavcodec/ac3dsp.c index 090287e42d..385a642af1 100644 --- a/libavcodec/ac3dsp.c +++ b/libavcodec/ac3dsp.c @@ -83,8 +83,16 @@ static void ac3_bit_alloc_calc_bap_c(int16_t *mask, int16_t *psd, return; } - bin = start; - band = ff_ac3_bin_to_band_tab[start]; + /* the first 28 bands have one coefficient each */ + for (bin = start; bin < FFMIN(end, 28); bin++) { + int m = (FFMAX(mask[bin] - snr_offset - floor, 0) & 0x1FE0) + floor; + int address = av_clip_uintp2((psd[bin] - m) >> 5, 6); + bap[bin] = bap_tab[address]; + } + if (bin >= end) + return; + + band = ff_ac3_bin_to_band_tab[bin]; do { int m = (FFMAX(mask[band] - snr_offset - floor, 0) & 0x1FE0) + floor; band_end = ff_ac3_band_start_tab[++band]; -- To stop receiving notification emails like this one, please contact [email protected]. _______________________________________________ ffmpeg-cvslog mailing list -- [email protected] To unsubscribe send an email to [email protected]
