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avcodec/apedec: Fix CRC for 24bps and bigendian 

Fixes CRC for vlc.ape and APE_48K_24bit_2CH_02_01.ape

Signed-off-by: Michael Niedermayer <michael@niedermayer.cc>
(cherry picked from commit 696e161919)
Signed-off-by: Michael Niedermayer <michael@niedermayer.cc>
This commit is contained in:
Michael Niedermayer 2023-08-25 00:24:21 +02:00
parent 13d0022307
commit 4695759985
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GPG Key ID: B18E8928B3948D64
1 changed files with 14 additions and 3 deletions
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17
libavcodec/apedec.c
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@ -1581,13 +1581,24 @@ static int ape_decode_frame(AVCodecContext *avctx, void *data,
s->samples -= blockstodecode;
if (avctx->err_recognition & AV_EF_CRCCHECK &&
s->fileversion >= 3900 && s->bps < 24) {
s->fileversion >= 3900) {
uint32_t crc = s->CRC_state;
const AVCRC *crc_tab = av_crc_get_table(AV_CRC_32_IEEE_LE);
int stride = s->bps == 24 ? 4 : (s->bps>>3);
int offset = s->bps == 24;
int bytes = s->bps >> 3;
for (i = 0; i < blockstodecode; i++) {
for (ch = 0; ch < s->channels; ch++) {
uint8_t *smp = frame->data[ch] + (i*(s->bps >> 3));
crc = av_crc(crc_tab, crc, smp, s->bps >> 3);
#if HAVE_BIGENDIAN
uint8_t *smp_native = frame->data[ch] + i*stride;
uint8_t smp[4];
for(int j = 0; j<stride; j++)
smp[j] = smp_native[stride-j-1];
#else
uint8_t *smp = frame->data[ch] + i*stride;
#endif
crc = av_crc(crc_tab, crc, smp+offset, bytes);
}
}