I'm sorry to dump this on a mailing list, but here goes:
cd /proc/asound
# ls -l
lrwxrwxrwx root root 1970-01-01 00:00 PMICaudio ->
card0
dr-xr-xr-x root root 1970-01-01 00:00 card0
-r--r--r-- root root 0 1970-01-01 00:00 pcm
-r--r--r-- root root 0 1970-01-01 00:00 timers
-r--r--r-- root root 0 1970-01-01 00:00 cards
-r--r--r-- root root 0 1970-01-01 00:00 devices
-r--r--r-- root root 0 1970-01-01 00:00 version
dr-xr-xr-x root root 1970-01-01 00:00 oss
# cd card0
# ls -l
-rw-r--r-- root root 0 1970-01-01 00:00 oss_mixer
-r--r--r-- root root 0 1970-01-01 00:00 id
dr-xr-xr-x root root 1970-01-01 00:00 pcm2p
dr-xr-xr-x root root 1970-01-01 00:00 pcm1p
dr-xr-xr-x root root 1970-01-01 00:00 pcm0c
dr-xr-xr-x root root 1970-01-01 00:00 pcm0p
# cd ../
# ls -l
lrwxrwxrwx root root 1970-01-01 00:01 PMICaudio ->
card0
dr-xr-xr-x root root 1970-01-01 00:01 card0
-r--r--r-- root root 0 1970-01-01 00:01 pcm
-r--r--r-- root root 0 1970-01-01 00:01 timers
-r--r--r-- root root 0 1970-01-01 00:01 cards
-r--r--r-- root root 0 1970-01-01 00:01 devices
-r--r--r-- root root 0 1970-01-01 00:01 version
dr-xr-xr-x root root 1970-01-01 00:01 oss
# cat devices
0: [ 0] : control
16: [ 0- 0]: digital audio playback
17: [ 0- 1]: digital audio playback
18: [ 0- 2]: digital audio playback
24: [ 0- 0]: digital audio capture
33: : timer
# cd /dev/snd
# ls -l
crw-rw-r-- system audio 14, 0 1970-01-01 00:00 mixer
crw-rw-r-- system audio 116, 0 1970-01-01 00:00 controlC0
crw-rw-r-- system audio 14, 4 1970-01-01 00:00 audio
crw-rw-r-- system audio 14, 3 1970-01-01 00:00 dsp
crw-rw-r-- system audio 116, 24 1970-01-01 00:00 pcmC0D0c
crw-rw-r-- system audio 116, 16 1970-01-01 00:00 pcmC0D0p
crw-rw-r-- system audio 14, 12 1970-01-01 00:00 adsp
crw-rw-r-- system audio 116, 17 1970-01-01 00:00 pcmC0D1p
crw-rw-r-- system audio 116, 18 1970-01-01 00:00 pcmC0D2p
crw-rw-r-- system audio 116, 33 1970-01-01 00:00 timer
Here is the asound.conf file:
# cat /etc/asound.conf
# Android ALSA configuration file for OMAP2430SDP using the MXC audio.
##
## Mixer Devices
##
ctl.AndroidPlayback {
type hw
card 0
}
ctl.AndroidRecord {
type hw
card 0
}
##
## Playback Devices
##
pcm.AndroidPlayback_Speaker {
type hooks
slave.pcm {
type hw
card 0
device 0 # Must be of type "digital audio playback"
}
hooks.0 {
type ctl_elems
hook_args [
# Enable audio output from the DSP
{
name "T2 Master codec configure Switch"
lock false
preserve true
optional false
value true
}
{
name "T2 Master codec Sample Rate"
lock false
preserve true
optional true
value 48000
}
{
name "Playback Source"
lock false
preserve true
optional false
# Values are:
# 0 - 'Stereo Headset'
# 1 - 'Hands-free (Speakers)'
# 2 - 'Mono Handset'
# 3 'USB CarKit'
value 'Hands-free (Speakers)'
}
]
}
}
pcm.AndroidPlayback_Headset {
type hooks
slave.pcm {
type hw
card 0
device 0 # Must be of type "digital audio playback"
}
hooks.0 {
type ctl_elems
hook_args [
# Enable audio output from the DSP
{
name "T2 Master codec configure Switch"
value true
}
{
name "T2 Master codec Sample Rate"
value 48000
}
{
name "Playback Source"
value 'Stereo Headset'
}
]
}
}
pcm.AndroidPlayback_Earpiece {
type hooks
slave.pcm {
type hw
card 0
device 0 # Must be of type "digital audio playback"
}
hooks.0 {
type ctl_elems
hook_args [
# Enable audio output from the DSP
{
name "T2 Master codec configure Switch"
value true
}
{
name "T2 Master codec Sample Rate"
value 48000
}
{
name "Playback Source"
value 'Mono Handset'
}
]
}
}
# No bluetooth available. Send output to the bit bucket.
pcm.AndroidPlayback_Bluetooth {
type null
}
##
## Recording device
##
pcm.AndroidRecord_Microphone {
type hooks
slave.pcm {
type hw
card 0
device 0 # Must be of type "digital audio capture"
}
hooks.0 {
type ctl_elems
hook_args [
{
# MXC values for capture source:
# 0 - 'Headset Mic'
# 1 - 'Main Mic Sub Mic'
# 2 - 'Aux/FM'
# 3 - 'USB CarKit'
name "Capture Source"
lock false
preserve true
optional false
value 'Main Mic Sub Mic'
}
{
# Enable capture, range [0..100]
name "Mic Headset Capture Volume"
value [100 100]
}
{
name "Mic Headset Capture Switch"
value true
}
{
# MXC Capture volume, range [0..100]
name "Master Capture Volume"
value [60 60]
}
]
}
}
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