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https://bugtrack.alsa-project.org/alsa-bug/view.php?id=5587
diff -pru alsa-plugins-1.0.25-original/a52/pcm_a52.c alsa-plugins-1.0.25-for-ffmpeg-0.11/a52/pcm_a52.c
--- alsa-plugins-1.0.25-original/a52/pcm_a52.c 2012-01-25 08:57:07.000000000 +0100
+++ alsa-plugins-1.0.25-for-ffmpeg-0.11/a52/pcm_a52.c 2012-06-01 14:59:47.096671464 +0200
@@ -441,7 +441,21 @@ static int a52_prepare(snd_pcm_ioplug_t
#else
rec->avctx->sample_fmt = SAMPLE_FMT_S16;
#endif
-#if LIBAVCODEC_VERSION_MAJOR > 52 || (LIBAVCODEC_VERSION_MAJOR == 52 && LIBAVCODEC_VERSION_MINOR >= 3)
+#if (LIBAVCODEC_VERSION_MAJOR >= 54)
+ switch (io->channels) {
+ case 2:
+ rec->avctx->channel_layout = AV_CH_LAYOUT_STEREO;
+ break;
+ case 4:
+ rec->avctx->channel_layout = AV_CH_LAYOUT_QUAD;
+ break;
+ case 6:
+ rec->avctx->channel_layout = AV_CH_LAYOUT_5POINT1;
+ break;
+ default:
+ break;
+ }
+#elif (LIBAVCODEC_VERSION_MAJOR > 52 && LIBAVCODEC_VERSION_MAJOR < 54) || (LIBAVCODEC_VERSION_MAJOR == 52 && LIBAVCODEC_VERSION_MINOR >= 3)
switch (io->channels) {
case 2:
rec->avctx->channel_layout = CH_LAYOUT_STEREO;
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