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aacdec_usac: skip coeff decoding if the number to be decoded is 0

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Yet another thing not mentioned in the spec.
This commit is contained in:
Lynne
2024-06-06 04:38:47 +02:00
parent 1ad9a4008b
commit a18d0659f4
1 changed files with 7 additions and 1 deletions
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8
libavcodec/aac/aacdec_usac.c
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@@ -572,9 +572,15 @@ static int decode_spectrum_and_dequant_ac(AACDecContext *s, float coef[1024],
int gb_count; int gb_count;
GetBitContext gb2; GetBitContext gb2;
ff_aac_ac_init(&ac, gb);
c = ff_aac_ac_map_process(state, reset, N); c = ff_aac_ac_map_process(state, reset, N);
if (!len) {
ff_aac_ac_finish(state, 0, N);
return 0;
}
ff_aac_ac_init(&ac, gb);
/* Backup reader for rolling back by 14 bits at the end */ /* Backup reader for rolling back by 14 bits at the end */
gb2 = *gb; gb2 = *gb;
gb_count = get_bits_count(&gb2); gb_count = get_bits_count(&gb2);