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avcodec/nvdec_mpeg2: fix order of quant matrix coefficients 

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 b0fe83714b
commit 1c19e2c82d
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GPG Key ID: 846079A4B0A7C1B5
1 changed files with 3 additions and 2 deletions
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5
libavcodec/nvdec_mpeg12.c
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@ -76,8 +76,9 @@ static int nvdec_mpeg12_start_frame(AVCodecContext *avctx, const uint8_t *buffer
};
for (i = 0; i < 64; ++i) {
ppc->QuantMatrixIntra[i] = s->intra_matrix[i];
ppc->QuantMatrixInter[i] = s->inter_matrix[i];
int n = s->idsp.idct_permutation[i];
ppc->QuantMatrixIntra[i] = s->intra_matrix[n];
ppc->QuantMatrixInter[i] = s->inter_matrix[n];
}
return 0;