[SCM] libav/experimental: Change 4xm demuxer and video decoder to pass the video format version in extradata instead of codec_tag.

[siretart at users.alioth.debian.org]

The following commit has been merged in the experimental branch:
commit b6f508bbcc60b942b85e94997b39df4599d93866
Author: Roberto Togni <r_togni at tiscali.it>
Date:   Mon Aug 27 21:58:39 2007 +0000

    Change 4xm demuxer and video decoder to pass the video format version in
    extradata instead of codec_tag.
    
    Originally committed as revision 10253 to svn://svn.ffmpeg.org/ffmpeg/trunk

diff --git a/libavcodec/4xm.c b/libavcodec/4xm.c
index 7af22c7..83e1b92 100644
--- a/libavcodec/4xm.c
+++ b/libavcodec/4xm.c
@@ -789,7 +789,12 @@ static void common_init(AVCodecContext *avctx){
 static int decode_init(AVCodecContext *avctx){
     FourXContext * const f = avctx->priv_data;
 
-    f->version= avctx->codec_tag == 0x40000;
+    if(avctx->extradata_size != 4 || !avctx->extradata) {
+        av_log(avctx, AV_LOG_ERROR, "extradata wrong or missing\n");
+        return 1;
+    }
+
+    f->version= AV_RL32(avctx->extradata) == 0x40000;
     common_init(avctx);
     init_vlcs(f);
 
diff --git a/libavformat/4xm.c b/libavformat/4xm.c
index 94bd025..5f982e3 100644
--- a/libavformat/4xm.c
+++ b/libavformat/4xm.c
@@ -149,7 +149,9 @@ static int fourxm_read_header(AVFormatContext *s,
 
             st->codec->codec_type = CODEC_TYPE_VIDEO;
             st->codec->codec_id = CODEC_ID_4XM;
-            st->codec->codec_tag = AV_RL32(&header[i + 16]);
+            st->codec->extradata_size = 4;
+            st->codec->extradata = av_malloc(4);
+            AV_WL32(st->codec->extradata, AV_RL32(&header[i + 16]));
             st->codec->width = fourxm->width;
             st->codec->height = fourxm->height;
 

-- 
Libav/FFmpeg packaging