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Pulseaudio expects clients to specify their channel-map if the default (ALSA) map does not route the audio to the expected speakers. Many Google results suggest dealing with this by re-routing the audio channels with the appropriate ALSA plugin, but this will then simply break any clients which expect the default ALSA mapping. Virtually all media files and codecs, certainly flac, dca, a52, and of course anything based on Microsoft's WAVEFORMAT_EXTENSIBLE specification, assume the layout in the table here: http://en.wikipedia.org/wiki/Surround_sound#Standard_speaker_channels Fortunately, pulseaudio directly addresses this with a built-in channel map for WAVE-EX which can be set automatically in the stream sample-spec.
Music Player Daemon (MPD) http://www.musicpd.org A daemon for playing music of various formats. Music is played through the server's audio device. The daemon stores info about all available music, and this info can be easily searched and retrieved. Player control, info retrieval, and playlist management can all be managed remotely. For basic installation information see the INSTALL file. MPD is released under the GNU General Public License version 2, which is distributed in the COPYING file. You should have received a copy of the GNU General Public License along with this program. If not, see <http://www.gnu.org/licenses/>.