From 549430e14da798e776ac6543351c5b98aecf2d1a Mon Sep 17 00:00:00 2001 From: Hendrik Leppkes Date: Mon, 15 May 2023 13:35:42 +0200 Subject: avcodec/vdpau_mpeg4: 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. --- 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); -- cgit v1.2.1