alsa-plugins version 1.0.25 cannot build with latest ffmpeg version 0.11 because a few CH_LAYOUT_* aliases to AV_CH_LAYOUT_* defines have been removed from the ffmpeg libavcodec header files.
A bug has been opened in the bug tracking system (#0005587):
https://bugtrack.alsa-project.org/alsa-bug/view.php?id=5587
Here is an example patch to fix the issue:
Ffmpeg 0.11 (LIBAVCODEC_VERSION_MAJOR = 54) removed the CH_LAYOUT_* aliases for the AV_CH_LAYOUT_* defines.
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;