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avcodec/nvdec_mpeg4: 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 13:33:18 +02:00
parent af8affb77e
commit b3e938ef80
1 changed files with 3 additions and 2 deletions
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5
libavcodec/nvdec_mpeg4.c
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@@ -88,8 +88,9 @@ static int nvdec_mpeg4_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];
}
// We need to pass the full frame buffer and not just the slice