Difference between revisions of "Audio in 1004"

Revision as of 21:25, 16 December 2012

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 /usr/pluto/bin/nvidia-install.sh for various GT chipsets. This can be done at avwizard on the Audio Selector step 5, or at any time by running /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.

• Analog, Optical, Coax and HDMI are treated the way they always have been, given only the card# to write to the confs.
• 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 with some newer GT series nvidia that do not identify as second card or require backports, also supports other oddball devices.

• Analog, Optical, Coax, HDMI are given the card# and the device# to write to the confs.

AlternateSC = 2 : should only be necessary for analog multi-channel and other oddballs that do not work under other two schemes, covers newer equipment. This additionally changes the xine.conf scheme.

• Analog Multi-channel 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:0"
       rate 48000
}

pcm.analog_playback {
       type plug
       slave analog_convert48k
}

!default {
       type asym
       playback.pcm "plug:dmix:0"
       capture.pcm "plughw:0"
}

nVidia GT series HDMI

</etc/pluto/alsa/virtual_cards.conf>

pcm_slave.hdmi_convert48k {
       pcm "hdmi:1,7"
       rate 48000
}

pcm.hdmi_playback {
       type plug
       slave hdmi_convert48k
}

!default {
       type asym
       playback.pcm "hdmi_playback"
       capture.pcm "plughw:1,7"
}

AlternateSC = 1

Analog, Optical, Coax, and HDMI

</etc/pluto/alsa/virtual_cards.conf>

pcm_slave.hdmi_convert48k {
       pcm "hdmi:0,3"
       rate 48000
}

pcm.hdmi_playback {
       type plug
       slave hdmi_convert48k
}

!default {
       type asym
       playback.pcm "hdmi_playback"
       capture.pcm "plughw:0,3"
}

AlternateSC = 2

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"
}

xine.conf

In conditions of null, 0 or 1 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 = 2, , 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:0,3
audio.device.alsa_default_device:plughw:0,3
audio.output.speaker_arrangement:Stereo 2.0

Except in the case of null or 0, when it appears like so:

audio.device.alsa_front_device:plughw:0
audio.device.alsa_default_device:plughw:0
audio.output.speaker_arrangement:Stereo 2.0