[FFmpeg-cvslog] mtv: Make sure audio_subsegments is not 0

[Shitiz Garg]

ffmpeg | branch: master | Shitiz Garg <mail at dragooon.net> | Fri Dec 16 00:54:27 2011 +0530| [feb15cee5e19a1e31d075ec08d598d64c2dc38ef] | committer: Justin Ruggles

mtv: Make sure audio_subsegments is not 0

audio_subsegments would be 0 and cause floating point exceptions
Fixes bugzilla #144

Signed-off-by: Justin Ruggles <justin.ruggles at gmail.com>

> http://git.videolan.org/gitweb.cgi/ffmpeg.git/?a=commit;h=feb15cee5e19a1e31d075ec08d598d64c2dc38ef
---

 libavformat/mtv.c |    6 ++++++
 1 files changed, 6 insertions(+), 0 deletions(-)

diff --git a/libavformat/mtv.c b/libavformat/mtv.c
index c3fb15c..4c3b082 100644
--- a/libavformat/mtv.c
+++ b/libavformat/mtv.c
@@ -106,6 +106,12 @@ static int mtv_read_header(AVFormatContext *s, AVFormatParameters *ap)
 
     avio_skip(pb, 4);
     audio_subsegments = avio_rl16(pb);
+
+    if (audio_subsegments == 0) {
+        av_log_ask_for_sample(s, "MTV files without audio are not supported\n");
+        return AVERROR_INVALIDDATA;
+    }
+
     mtv->full_segment_size =
         audio_subsegments * (MTV_AUDIO_PADDING_SIZE + MTV_ASUBCHUNK_DATA_SIZE) +
         mtv->img_segment_size;