View source for Audio in 1004

[[Category:Installation Tutorials]]
[[Category:Hardware]]
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Alternate sound configurations can be set in /etc/pluto.conf. MOST sound cards should work out of the box, and do not require this parameter. This parameter may be written by [http://svn.linuxmce.org/trac.cgi/browser/branches/LinuxMCE-1004/src/BootScripts/nvidia-install.sh /usr/pluto/bin/nvidia-install.sh] for various GT chipsets. This can be done at avwizard on the [http://wiki.linuxmce.org/index.php/AVWizard_Step_by_Step#Audio_Output_Connector Audio Selector step 5], or at any time by running [http://svn.linuxmce.org/trac.cgi/browser/branches/LinuxMCE-1004/src/BootScripts/SetupAudioVideo.sh /usr/pluto/bin/SetupAudioVideo.sh] '''NOTE: Audio should NOT be actively playing when running SetupAudioVideo.sh.'''

Auto-detection is attempted when specific packages are installed, or if the pluto.conf "AlternateSC" setting is null or = 0. In most cases, this value will never exist.

Below are example /etc/asound.conf files generated by these configurations. /etc/pluto/xine.conf files borrow the card# and device# (if any) in the same way as the asound.conf

'''AlternateSC = null''' : Most cards function without this parameter, this is the default state.
* [http://wiki.linuxmce.org/index.php/Audio_in_1004#Analog.2C_Optical.2C_Coax.2C_HDMI Analog, Optical, Coax and HDMI] are treated the way they always have been, given only the card# to write to the confs.
* [http://wiki.linuxmce.org/index.php/Audio_in_1004#nVidia_GT_series_HDMI nVidia GT series HDMI] is automatically detected, and given a special set of values, also using the card# and the device#.


'''AlternateSC = 1''' : Should only be necessary for analog multi-channel.
* [http://wiki.linuxmce.org/index.php/Audio_in_1004#AlternateSC_.3D_1 Analog Multi-channel]  are given the card# and the device# to write to the confs.


'''AlternateSC = 2''' : Should only be necessary for oddballs that do not work under other two schemes, covers older equipment. This additionally changes the [http://wiki.linuxmce.org/index.php/Audio_in_1004#xine.conf xine.conf] scheme.
* [http://wiki.linuxmce.org/index.php/Audio_in_1004#AlternateSC_.3D_2 Analog, Optical, Coax, HDMI]are given an extended scheme, including both the card# and device#.


==AlternateSC = 0 or null==
===Analog, Optical, Coax, HDMI===

 </etc/pluto/alsa/virtual_cards.conf>
 
 pcm_slave.analog_convert48k {
        pcm "analog_8:0,0"
 }
 
 pcm.analog_playback {
        type plug
        slave analog_convert48k
 }
 
 !default {
        type asym
        playback.pcm "analog_playback:0,0"
        capture.pcm "plughw:0,0"
 }

==AlternateSC = 1==
===Analog Multi-channel, Optical, Coax, and HDMI===
 </etc/pluto/alsa/virtual_cards.conf>
 
 pcm.analog_6 {
        slave.pcm surround51
        slave.rate 48000
        slave.channels 6
        type route
        ttable.0.0 1
        ttable.1.1 1
        ttable.0.2 1
        ttable.1.3 1
        ttable.0.4 0.5
        ttable.1.4 0.5
        ttable.0.5 0.5
        ttable.1.5 0.5
 }
 
 pcm.analog_8 {
        slave.pcm multi
        slave.rate 48000
        slave.channels 8
        type route
        ttable.0.0 1.0
        ttable.1.1 1.0
        ttable.2.2 1.0
        ttable.3.3 1.0
        ttable.4.4 1.0
        ttable.5.5 1.0
        ttable.0.6 1.0
        ttable.1.7 1.0
        ttable.2.6 0.7
        ttable.3.7 0.7
        ttable.4.6 0.7
        ttable.4.7 0.7
        ttable.5.6 0.5
        ttable.5.7 0.5
 }
 
 pcm_slave.analog_convert48k {
        pcm "analog_8:0,0"
 }
 
 pcm.analog_playback {
        type plug
        slave analog_convert48k
 }
 
 !default {
        type asym
        playback.pcm "analog_playback:0,0"
        capture.pcm "plughw:0,0"
 }


==AlternateSC = 2==
===Analog, Optical, Coax, and HDMI===
 </etc/pluto/alsa/virtual_cards.conf>
 
 pcm_slave.hdmi_convert48k {
        pcm "hw:0"
        rate 48000
 }
 
 pcm.hdmi_playback {
        type plug
        slave hdmi_convert48k
 }
 
 !default {
        type asym
        playback.pcm "hdmi_playback"
        capture.pcm "hw:0"
 }

==xine.conf==
In conditions of null, 0 values of AlternateSC for multi-channel audio, the last 4 lines of /etc/pluto/xine.conf looks like this
 audio.device.alsa_front_device:plughw:0,3
 audio.device.alsa_default_device:plughw:0,3
 audio.output.speaker_arrangement:Pass Through
 audio.device.alsa_passthrough_device:plughw:0,3

In the case AlternateSC = 1, some sound cards cease functioning when the Pass Through arrangement is specified, instead of just the passthrough device.
 audio.device.alsa_front_device:plughw:0,3
 audio.device.alsa_default_device:plughw:0,3
 audio.device.alsa_passthrough_device:plughw:0,3

All stereo analog appears like so:
 audio.device.alsa_front_device:plughw:0,0
 audio.device.alsa_default_device:plughw:0,0
 audio.output.speaker_arrangement:Stereo 2.0

Except in the case of 2, when it appears like so:
 audio.device.alsa_front_device:hw:0
 audio.device.alsa_default_device:hw:0
 audio.output.speaker_arrangement:Stereo 2.0