From 07d84a4e9f37a42a390418928cc086246f846e3f Mon Sep 17 00:00:00 2001
From: Alex Beregszaszi <alex@rtfs.hu>
Date: Sun, 29 Apr 2007 13:25:32 +0000
Subject: [PATCH] check for channels<=0 and print a reasonable error message

Originally committed as revision 8857 to svn://svn.ffmpeg.org/ffmpeg/trunk
---
 libavcodec/mpegaudio.c | 4 +++-
 1 file changed, 3 insertions(+), 1 deletion(-)

diff --git a/libavcodec/mpegaudio.c b/libavcodec/mpegaudio.c
index aa93442d57..c8f25d114e 100644
--- a/libavcodec/mpegaudio.c
+++ b/libavcodec/mpegaudio.c
@@ -70,8 +70,10 @@ static int MPA_encode_init(AVCodecContext *avctx)
     int i, v, table;
     float a;
 
-    if (channels > 2)
+    if (channels <= 0 || channels > 2){
+        av_log(avctx, AV_LOG_ERROR, "encoding %d channel(s) is not allowed in mp2\n", channels);
         return -1;
+    }
     bitrate = bitrate / 1000;
     s->nb_channels = channels;
     s->freq = freq;