[FFmpeg-cvslog] avformat/mp3dec: properly allocate dummy AVCodecContext

[Michael Niedermayer]

ffmpeg | branch: release/2.5 | Michael Niedermayer <michaelni at gmx.at> | Thu Feb 26 19:59:44 2015 +0100| [64c82912a74aee655618f67998c99eda36d2c6bb] | committer: Michael Niedermayer

avformat/mp3dec: properly allocate dummy AVCodecContext

Fixes (harmless) use of uninitialized variable

Found-by: jamrial
Signed-off-by: Michael Niedermayer <michaelni at gmx.at>
(cherry picked from commit 6ad42b3e15478284321dd285acaf189a16590854)

Conflicts:

	libavformat/mp3dec.c

> http://git.videolan.org/gitweb.cgi/ffmpeg.git/?a=commit;h=64c82912a74aee655618f67998c99eda36d2c6bb
---

 libavformat/mp3dec.c |    5 +++--
 1 file changed, 3 insertions(+), 2 deletions(-)

diff --git a/libavformat/mp3dec.c b/libavformat/mp3dec.c
index c4c1bb7..030b11f 100644
--- a/libavformat/mp3dec.c
+++ b/libavformat/mp3dec.c
@@ -61,7 +61,7 @@ static int mp3_read_probe(AVProbeData *p)
     int fsize, frames, sample_rate;
     uint32_t header;
     const uint8_t *buf, *buf0, *buf2, *end;
-    AVCodecContext avctx;
+    AVCodecContext *avctx = avcodec_alloc_context3(NULL);
 
     buf0 = p->buf;
     end = p->buf + p->buf_size - sizeof(uint32_t);
@@ -78,7 +78,7 @@ static int mp3_read_probe(AVProbeData *p)
 
         for(frames = 0; buf2 < end; frames++) {
             header = AV_RB32(buf2);
-            fsize = avpriv_mpa_decode_header(&avctx, header, &sample_rate, &sample_rate, &sample_rate, &sample_rate);
+            fsize = avpriv_mpa_decode_header(avctx, header, &sample_rate, &sample_rate, &sample_rate, &sample_rate);
             if(fsize < 0)
                 break;
             buf2 += fsize;
@@ -87,6 +87,7 @@ static int mp3_read_probe(AVProbeData *p)
         if(buf == buf0)
             first_frames= frames;
     }
+    avcodec_free_context(&avctx);
     // keep this in sync with ac3 probe, both need to avoid
     // issues with MPEG-files!
     if   (first_frames>=4) return AVPROBE_SCORE_EXTENSION + 1;