The matrix coefficients are stored permutated for the IDCT,
rather then in plain raster order, and need to be un-permutated
for the hardware.
---
libavcodec/vdpau_mpeg4.c | 5 +++--
1 file changed, 3 insertions(+), 2 deletions(-)
diff --git a/libavcodec/vdpau_mpeg4.c b/libavcodec/vdpau_mpeg4.c
index 6e082eefc6..1211b1df2c 100644
--- a/libavcodec/vdpau_mpeg4.c
+++ b/libavcodec/vdpau_mpeg4.c
@@ -74,8 +74,9 @@ static int vdpau_mpeg4_start_frame(AVCodecContext *avctx,
info->alternate_vertical_scan_flag = s->alternate_scan;
info->top_field_first = s->top_field_first;
for (i = 0; i < 64; ++i) {
- info->intra_quantizer_matrix[i] = s->intra_matrix[i];
- info->non_intra_quantizer_matrix[i] = s->inter_matrix[i];
+ int n = s->idsp.idct_permutation[i];
+ info->intra_quantizer_matrix[i] = s->intra_matrix[n];
+ info->non_intra_quantizer_matrix[i] = s->inter_matrix[n];
}
ff_vdpau_common_start_frame(pic_ctx, buffer, size);
--
2.40.1.windows.1
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