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avcodec/ac3dsp: skip the inner loop for single-bin bands

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calculate bap directly for the first 28 bands. each contains
only one coefficient.

Signed-off-by: Ayoub Nabil Boubagrat <237098474+ayoubnabil@users.noreply.github.com>
This commit is contained in:
Ayoub Nabil Boubagrat
2026-09-05 12:56:25 +02:00
committed by michaelni
parent 5cd37f1ded
commit 304efa29ae
1 changed files with 10 additions and 2 deletions
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12
libavcodec/ac3dsp.c
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@@ -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];