[FFmpeg-cvslog] doc/examples/muxing: pick a supported channel layout if stereo isnt supported by the encoder

[Michael Niedermayer]

ffmpeg | branch: master | Michael Niedermayer <michaelni at gmx.at> | Sat Jul 26 22:00:07 2014 +0200| [ead22f42f4fc078bb60549238233d5862da5a488] | committer: Michael Niedermayer

doc/examples/muxing: pick a supported channel layout if stereo isnt supported by the encoder

Signed-off-by: Michael Niedermayer <michaelni at gmx.at>

> http://git.videolan.org/gitweb.cgi/ffmpeg.git/?a=commit;h=ead22f42f4fc078bb60549238233d5862da5a488
---

 doc/examples/muxing.c |   10 +++++++++-
 1 file changed, 9 insertions(+), 1 deletion(-)

diff --git a/doc/examples/muxing.c b/doc/examples/muxing.c
index b979b6d..76169a4 100644
--- a/doc/examples/muxing.c
+++ b/doc/examples/muxing.c
@@ -93,6 +93,7 @@ static void add_stream(OutputStream *ost, AVFormatContext *oc,
                        enum AVCodecID codec_id)
 {
     AVCodecContext *c;
+    int i;
 
     /* find the encoder */
     *codec = avcodec_find_encoder(codec_id);
@@ -116,8 +117,15 @@ static void add_stream(OutputStream *ost, AVFormatContext *oc,
             (*codec)->sample_fmts[0] : AV_SAMPLE_FMT_FLTP;
         c->bit_rate    = 64000;
         c->sample_rate = 44100;
-        c->channels    = 2;
         c->channel_layout = AV_CH_LAYOUT_STEREO;
+        if ((*codec)->channel_layouts) {
+            c->channel_layout = (*codec)->channel_layouts[0];
+            for (i = 0; (*codec)->channel_layouts[i]; i++) {
+                if ((*codec)->channel_layouts[i] == AV_CH_LAYOUT_STEREO)
+                    c->channel_layout = AV_CH_LAYOUT_STEREO;
+            }
+        }
+        c->channels        = av_get_channel_layout_nb_channels(c->channel_layout);
         ost->st->time_base = (AVRational){ 1, c->sample_rate };
         break;