From: 0xBat via ffmpeg-devel <ffmpeg-devel@ffmpeg.org>
To: ffmpeg-devel@ffmpeg.org
Cc: 0xBat <monsterbat02@gmail.com>
Subject: [FFmpeg-devel] [PATCH] avcodec/eatqi: clamp quantizer value to prevent underflow
Date: Mon, 5 Jan 2026 01:35:01 +0100
Message-ID: <20260105003504.1895-2-monsterbat02@gmail.com> (raw)
In-Reply-To: <20260105003504.1895-1-monsterbat02@gmail.com>
Ensure the quantizer value does not exceed 107 to prevent the qscale calculation from underflowing or producing invalid results.
Signed-off-by: 0xBat <monsterbat02@gmail.com>
---
libavcodec/eatqi.c | 2 ++
1 file changed, 2 insertions(+)
diff --git a/libavcodec/eatqi.c b/libavcodec/eatqi.c
index 421ed51009..2d74139d24 100644
--- a/libavcodec/eatqi.c
+++ b/libavcodec/eatqi.c
@@ -111,6 +111,8 @@ static inline void tqi_idct_put(AVCodecContext *avctx, AVFrame *frame,
static void tqi_calculate_qtable(TqiContext *t, int quant)
{
+ if (quant > 107)
+ quant = 107;
const int64_t qscale = (215 - 2*quant)*5;
int i;
--
2.52.0.windows.1
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next prev parent reply other threads:[~2026-01-06 2:14 UTC|newest]
Thread overview: 6+ messages / expand[flat|nested] mbox.gz Atom feed top
2026-01-05 0:35 [FFmpeg-devel] [PATCH] avcodec/dxv: fix index validation against texture size 0xBat via ffmpeg-devel
2026-01-05 0:35 ` 0xBat via ffmpeg-devel [this message]
2026-01-05 0:35 ` [FFmpeg-devel] [PATCH] avcodec/qdm2: check packet size before bitstream initialization 0xBat via ffmpeg-devel
2026-01-09 2:11 ` [FFmpeg-devel] " Michael Niedermayer via ffmpeg-devel
2026-01-05 0:35 ` [FFmpeg-devel] [PATCH] compat/android: fix DLL hijacking by using absolute paths 0xBat via ffmpeg-devel
2026-01-08 3:20 ` [FFmpeg-devel] Re: [PATCH] avcodec/dxv: fix index validation against texture size Michael Niedermayer via ffmpeg-devel
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