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From: Manuel Lauss <manuel.lauss@gmail.com>
To: ffmpeg-devel@ffmpeg.org
Date: Mon, 17 Mar 2025 18:49:14 +0100
Message-ID: <20250317174917.6872-13-manuel.lauss@gmail.com>
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Subject: [FFmpeg-devel] [PATCH v3 12/14] avcodec/sanm: ignore codec45
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Codec45 is used in some RA2 videos on top of codec37.
It consists of 2 tables (768 and 32768 bytes), and datapackets
like codec2 (delta-x, delta-y) with a pixel counter instead of a color value.
It then reads the 4 surrounding pixels, looks up 3 separate values
for each in table1, adds them together to form an index into
table2 for a new pixel value, in a row.
The data coming in gets the x/y coordinates out of the visible
area very quickly (2-3 iterations); I don't see any visual
difference between the ffmpeg-produced frames and ones captured
with dosbox from rebel assault 2, which leads me to believe this
codec never worked as intended.
Signed-off-by: Manuel Lauss <manuel.lauss@gmail.com>
---
v3: no changes
v2: newly added
libavcodec/sanm.c | 2 ++
1 file changed, 2 insertions(+)
diff --git a/libavcodec/sanm.c b/libavcodec/sanm.c
index 54d578ae4b..730ec14b98 100644
--- a/libavcodec/sanm.c
+++ b/libavcodec/sanm.c
@@ -1679,6 +1679,8 @@ static int process_frame_obj(SANMVideoContext *ctx, GetByteContext *gb)
return old_codec23(ctx, gb, top, left, w, h, param, parm2);
case 37:
return old_codec37(ctx, w, h);
+ case 45:
+ return 0;
case 47:
return old_codec47(ctx, w, h);
case 48:
--
2.49.0
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