[FFmpeg-cvslog] h263: more strictly forbid frame size changes with frame-mt.

[Ronald S. Bultje]

ffmpeg | branch: release/0.8 | Ronald S. Bultje <rsbultje at gmail.com> | Thu Mar 29 12:24:10 2012 -0700| [3fc967f6c7ab2a21e9e4cca93487286b431cd64a] | committer: Reinhard Tartler

h263: more strictly forbid frame size changes with frame-mt.

Prevents crashes because the old check was incomplete.

Found-by: Mateusz "j00ru" Jurczyk and Gynvael Coldwind
CC: libav-stable at libav.org
(cherry picked from commit 2d22d4307dcc1461f39a2ffb9c8db6c6b23fd080)

Signed-off-by: Reinhard Tartler <siretart at tauware.de>
(cherry picked from commit 7fe4c8cb761b0fc8685dacf9f187311b9d124a52)

Signed-off-by: Reinhard Tartler <siretart at tauware.de>

> http://git.videolan.org/gitweb.cgi/ffmpeg.git/?a=commit;h=3fc967f6c7ab2a21e9e4cca93487286b431cd64a
---

 libavcodec/h263dec.c |   12 +++++++-----
 1 file changed, 7 insertions(+), 5 deletions(-)

diff --git a/libavcodec/h263dec.c b/libavcodec/h263dec.c
index abdaf2b..021e172 100644
--- a/libavcodec/h263dec.c
+++ b/libavcodec/h263dec.c
@@ -426,6 +426,13 @@ retry:
     if (ret < 0){
         av_log(s->avctx, AV_LOG_ERROR, "header damaged\n");
         return -1;
+    } else if ((s->width  != avctx->coded_width  ||
+                s->height != avctx->coded_height ||
+                (s->width  + 15) >> 4 != s->mb_width ||
+                (s->height + 15) >> 4 != s->mb_height) &&
+               (HAVE_THREADS && (s->avctx->active_thread_type & FF_THREAD_FRAME))) {
+        av_log_missing_feature(s->avctx, "Width/height/bit depth/chroma idc changing with threads is", 0);
+        return AVERROR_PATCHWELCOME;   // width / height changed during parallelized decoding
     }
 
     avctx->has_b_frames= !s->low_delay;
@@ -567,11 +574,6 @@ retry:
         /* H.263 could change picture size any time */
         ParseContext pc= s->parse_context; //FIXME move these demuxng hack to avformat
 
-        if (HAVE_THREADS && (s->avctx->active_thread_type&FF_THREAD_FRAME)) {
-            av_log_missing_feature(s->avctx, "Width/height/bit depth/chroma idc changing with threads is", 0);
-            return -1;   // width / height changed during parallelized decoding
-        }
-
         s->parse_context.buffer=0;
         MPV_common_end(s);
         s->parse_context= pc;