[FFmpeg-cvslog] libavcodec/mjpeg: preserve unclipped last_dc value

[Ramiro Polla]

ffmpeg | branch: master | Ramiro Polla <ramiro.polla at gmail.com> | Fri Jun  7 21:26:54 2024 +0200| [a8e2714d824552ed210118d1ce48c770db3d8c56] | committer: Ramiro Polla

libavcodec/mjpeg: preserve unclipped last_dc value

Perform av_clip_int16(val) _after_ copying the value to last_dc.

This change ensures that clipping is applied only within the context of
the current block, preventing the propagation of clipped values to
subsequent DC components.

Related commits: c28f648b19d and dffae122d0f
Related ticket: 4683

> http://git.videolan.org/gitweb.cgi/ffmpeg.git/?a=commit;h=a8e2714d824552ed210118d1ce48c770db3d8c56
---

 libavcodec/mjpegdec.c    | 3 +--
 tests/ref/fate/jpg-12bpp | 2 +-
 2 files changed, 2 insertions(+), 3 deletions(-)

diff --git a/libavcodec/mjpegdec.c b/libavcodec/mjpegdec.c
index 1481a7f285..7daec649bc 100644
--- a/libavcodec/mjpegdec.c
+++ b/libavcodec/mjpegdec.c
@@ -843,9 +843,8 @@ static int decode_block(MJpegDecodeContext *s, int16_t *block, int component,
         return AVERROR_INVALIDDATA;
     }
     val = val * (unsigned)quant_matrix[0] + s->last_dc[component];
-    val = av_clip_int16(val);
     s->last_dc[component] = val;
-    block[0] = val;
+    block[0] = av_clip_int16(val);
     /* AC coefs */
     i = 0;
     {OPEN_READER(re, &s->gb);
diff --git a/tests/ref/fate/jpg-12bpp b/tests/ref/fate/jpg-12bpp
index b3c662d587..9b039a92c6 100644
--- a/tests/ref/fate/jpg-12bpp
+++ b/tests/ref/fate/jpg-12bpp
@@ -3,4 +3,4 @@
 #codec_id 0: rawvideo
 #dimensions 0: 999x749
 #sar 0: 1/1
-0,          0,          0,        1,  1496502, 0xd91deb4b
+0,          0,          0,        1,  1496502, 0x44efc0af