From: Valerii Zapodovnikov via ffmpeg-devel <ffmpeg-devel@ffmpeg.org>
To: ffmpeg-devel@ffmpeg.org
Cc: Valerii Zapodovnikov <code@ffmpeg.org>
Subject: [FFmpeg-devel] [PR] avcodec/hevc/hevcdec: take into account YUV400 in block length (PR #21630)
Date: Mon, 02 Feb 2026 21:46:11 -0000
Message-ID: <177006877173.25.6859219608372993501@4457048688e7> (raw)
PR #21630 opened by Valerii Zapodovnikov (Balling)
URL: https://code.ffmpeg.org/FFmpeg/FFmpeg/pulls/21630
Patch URL: https://code.ffmpeg.org/FFmpeg/FFmpeg/pulls/21630.patch
Signed-off-by: Valerii Zapodovnikov <val.zapod.vz@gmail.com>
See issue #11551.
>From 90447b420fdc2b2a693623ecccdefe5e5845ec59 Mon Sep 17 00:00:00 2001
From: Valerii Zapodovnikov <val.zapod.vz@gmail.com>
Date: Tue, 3 Feb 2026 00:42:35 +0300
Subject: [PATCH] avcodec/hevc/hevcdec: take into account YUV400 in block
length
Signed-off-by: Valerii Zapodovnikov <val.zapod.vz@gmail.com>
---
libavcodec/hevc/hevcdec.c | 9 +++++----
1 file changed, 5 insertions(+), 4 deletions(-)
diff --git a/libavcodec/hevc/hevcdec.c b/libavcodec/hevc/hevcdec.c
index 531d1c26f3..fd8e269a8c 100644
--- a/libavcodec/hevc/hevcdec.c
+++ b/libavcodec/hevc/hevcdec.c
@@ -1668,10 +1668,11 @@ static int hls_pcm_sample(HEVCLocalContext *lc, const HEVCLayerContext *l,
uint8_t *dst1 = &s->cur_frame->f->data[1][(y0 >> sps->vshift[1]) * stride1 + ((x0 >> sps->hshift[1]) << sps->pixel_shift)];
uint8_t *dst2 = &s->cur_frame->f->data[2][(y0 >> sps->vshift[2]) * stride2 + ((x0 >> sps->hshift[2]) << sps->pixel_shift)];
- int length = cb_size * cb_size * sps->pcm.bit_depth +
- (((cb_size >> sps->hshift[1]) * (cb_size >> sps->vshift[1])) +
- ((cb_size >> sps->hshift[2]) * (cb_size >> sps->vshift[2]))) *
- sps->pcm.bit_depth_chroma;
+ int length = cb_size * cb_size * sps->pcm.bit_depth +
+ sps->chroma_format_idc != 0 ? (
+ (((cb_size >> sps->hshift[1]) * (cb_size >> sps->vshift[1])) +
+ ((cb_size >> sps->hshift[2]) * (cb_size >> sps->vshift[2]))) *
+ sps->pcm.bit_depth_chroma : 0 );
const uint8_t *pcm = skip_bytes(&lc->cc, (length + 7) >> 3);
int ret;
--
2.52.0
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