The delta escape (2) is supposed to work the same in 4-bit RLE as in
8-bit RLE. This is documented in the MSDN Bitmap Compression page:
https://msdn.microsoft.com/en-us/library/windows/desktop/dd183383(v=vs.85).aspx
The unchecked modification of line is safe, since the loop condition
(line >= 0) will check it before any pixel data is written.
Fixes ticket #5153 (output now matches ImageMagick for the provided
sample).
Signed-off-by: Daniel Verkamp <dan...@drv.nu>
---
libavcodec/msrledec.c | 2 +-
1 file changed, 1 insertion(+), 1 deletion(-)
diff --git a/libavcodec/msrledec.c b/libavcodec/msrledec.c
index 805802ae18..f0cbde67ff 100644
--- a/libavcodec/msrledec.c
+++ b/libavcodec/msrledec.c
@@ -63,7 +63,7 @@ static int msrle_decode_pal4(AVCodecContext *avctx, AVFrame
*pic,
stream_byte = bytestream2_get_byte(gb);
pixel_ptr += stream_byte;
stream_byte = bytestream2_get_byte(gb);
- avpriv_request_sample(avctx, "Unused stream byte %X",
stream_byte);
+ line -= stream_byte;
} else {
// copy pixels from encoded stream
odd_pixel = stream_byte & 1;
--
2.11.0.rc2
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