From: Hendrik Leppkes <h.leppkes@gmail.com>
To: ffmpeg-devel@ffmpeg.org
Cc: Hendrik Leppkes <h.leppkes@gmail.com>
Subject: [FFmpeg-devel] [PATCH 3/4] avcodec/vdpau_mpeg12: fix order of quant matrix coefficients
Date: Mon, 15 May 2023 13:39:10 +0200
Message-ID: <20230515113911.1232-3-h.leppkes@gmail.com> (raw)
In-Reply-To: <20230515113911.1232-1-h.leppkes@gmail.com>
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_mpeg12.c | 5 +++--
1 file changed, 3 insertions(+), 2 deletions(-)
diff --git a/libavcodec/vdpau_mpeg12.c b/libavcodec/vdpau_mpeg12.c
index 354239cad5..79007aa1a8 100644
--- a/libavcodec/vdpau_mpeg12.c
+++ b/libavcodec/vdpau_mpeg12.c
@@ -75,8 +75,9 @@ static int vdpau_mpeg_start_frame(AVCodecContext *avctx,
info->f_code[1][0] = s->mpeg_f_code[1][0];
info->f_code[1][1] = s->mpeg_f_code[1][1];
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];
}
return ff_vdpau_common_start_frame(pic_ctx, buffer, size);
--
2.40.1.windows.1
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next prev parent reply other threads:[~2023-05-15 11:41 UTC|newest]
Thread overview: 7+ messages / expand[flat|nested] mbox.gz Atom feed top
2023-05-15 10:51 [FFmpeg-devel] [PATCH] avcodec/nvdec_mpeg2: " Hendrik Leppkes
2023-05-15 11:30 ` Hendrik Leppkes
2023-05-15 12:01 ` Hendrik Leppkes
2023-05-15 11:39 ` [FFmpeg-devel] [PATCH 1/4] " Hendrik Leppkes
2023-05-15 11:39 ` [FFmpeg-devel] [PATCH 2/4] avcodec/nvdec_mpeg4: " Hendrik Leppkes
2023-05-15 11:39 ` Hendrik Leppkes [this message]
2023-05-15 11:39 ` [FFmpeg-devel] [PATCH 4/4] avcodec/vdpau_mpeg4: " Hendrik Leppkes
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