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[FFmpeg-devel,4/4] avcodec/vdpau_mpeg4: fix order of quant matrix coefficients

Message ID 20230515113911.1232-4-h.leppkes@gmail.com
State Accepted
Commit 6b2ae90411ce8f6f90269655bf912355121c0749
Headers show
Series [FFmpeg-devel,1/4] avcodec/nvdec_mpeg2: fix order of quant matrix coefficients | expand

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Commit Message

Hendrik Leppkes May 15, 2023, 11:39 a.m. UTC 
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(-)
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Patch

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);