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avcodec/nvdec_mpeg2: fix order of quant matrix coefficients

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The matrix coefficients are stored permutated for the IDCT,
rather then in plain raster order, and need to be un-permutated
for the hardware.
This commit is contained in:
Hendrik Leppkes 2023-05-15 12:49:21 +02:00
parent c3c8f97a98
commit f425361637
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GPG Key ID: 846079A4B0A7C1B5
1 changed files with 3 additions and 2 deletions
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libavcodec/nvdec_mpeg12.c
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@ -80,8 +80,9 @@ static int nvdec_mpeg12_start_frame(AVCodecContext *avctx, const uint8_t *buffer
}; };
for (i = 0; i < 64; ++i) { for (i = 0; i < 64; ++i) {
ppc->QuantMatrixIntra[i] = s->intra_matrix[i]; int n = s->idsp.idct_permutation[i];
ppc->QuantMatrixInter[i] = s->inter_matrix[i]; ppc->QuantMatrixIntra[i] = s->intra_matrix[n];
ppc->QuantMatrixInter[i] = s->inter_matrix[n];
} }
return 0; return 0;