topic Re: Record android system audio in i.MX Processors

Record android system audio

MustafaMunir — Mon, 24 Sep 2012 10:42:10 GMT

Hi,

I want to record android system audio output on file. On Linux, I have configure a .asoundrc file in my home directory to achieve this. That allows me to record system audio as a wave file on disk.

Is the same mechanism possible with android for i.MX53 ? Does alsa in android reads configuration from /system/etc/asound.conf ? or its configuration is simply hard coded in alsa source.

Thanks

Mustafa

Re: Record android system audio

RafaelThomasGoz — Mon, 08 Oct 2012 22:11:15 GMT

Well i have tested with an asound.conf and it seems to change the alsa configurations. However for some reason it doesn't get effective until android plays any audio once.

Re: Record android system audio

MustafaMunir — Tue, 09 Oct 2012 03:51:15 GMT

If that’s the case, I might be making some mistake in asound.conf. It would be great if you can share your asound.conf and I can test that on my Platform.

Thanks

Re: Record android system audio

RafaelThomasGoz — Tue, 09 Oct 2012 10:49:11 GMT

Here it is:

state.imx3stack {

control.1 {

comment.access 'read write'

comment.type ENUMERATED

comment.count 1

comment.item.0 '0dB'

comment.item.1 '20dB'

comment.item.2 '30dB'

comment.item.3 '40dB'

iface MIXER

name 'MIC GAIN'

value '0dB'

}

control.2 {

comment.access 'read write'

comment.type INTEGER

comment.count 2

comment.range '0 - 15'

iface MIXER

name 'Capture Volume'

value.0 15

value.1 15

}

control.3 {

comment.access 'read write'

comment.type ENUMERATED

comment.count 1

comment.item.0 'No Change'

comment.item.1 'Reduced by 6dB'

iface MIXER

name 'Capture Vol Reduction'

value 'No Change'

}

control.4 {

comment.access 'read write'

comment.type INTEGER

comment.count 2

comment.range '0 - 192'

iface MIXER

name 'Playback Volume'

value.0 192

value.1 192

}

control.5 {

comment.access 'read write'

comment.type INTEGER

comment.count 2

comment.range '0 - 127'

iface MIXER

name 'Headphone Volume'

value.0 127

value.1 127

}

control.6 {

comment.access 'read write'

comment.type ENUMERATED

comment.count 1

comment.item.0 DAC

comment.item.1 LINE_IN

iface MIXER

name 'DAC Mux'

value DAC

}

control.7 {

comment.access 'read write'

comment.type ENUMERATED

comment.count 1

comment.item.0 MIC_IN

comment.item.1 LINE_IN

iface MIXER

name 'ADC Mux'

value LINE_IN

}

control.8 {

comment.access 'read write'

comment.type ENUMERATED

comment.count 1

comment.item.0 disable

comment.item.1 '32KHz'

comment.item.2 '44.1KHz'

comment.item.3 '48KHz'

comment.item.4 '96KHz'

iface MIXER

name ASRC

value disable

}

control.9 {

comment.access 'read write'

comment.type ENUMERATED

comment.count 1

comment.item.0 off

comment.item.1 on

iface MIXER

name 'Jack Function'

value on

}

control.10 {

comment.access 'read write'

comment.type ENUMERATED

comment.count 1

comment.item.0 off

comment.item.1 on

iface MIXER

name 'Speaker Function'

value on

}

control.11 {

comment.access 'read write'

comment.type ENUMERATED

comment.count 1

comment.item.0 off

comment.item.1 on

iface MIXER

name 'Line In Function'

value on

}

state.imx3stackspdif {

control.1 {

comment.access 'read write'

comment.type ENUMERATED

comment.count 1

comment.item.0 off

comment.item.1 on

iface MIXER

name 'Speaker Function'

value on

}

Re: Record android system audio

li-chen — Fri, 23 May 2014 19:14:37 GMT

Hi, we also would like to capture the Android system audio on i.MX6. Is there an asound.conf available for i.MX6 platform so that we can use it to capture the Android system audio? Many thanks.

Re: Record android system audio

RafaelThomasGoz — Mon, 26 May 2014 21:49:44 GMT

I have not used mx6 yet, but will. However the alsa-ctl would give you the config options (then you need to transalte them to the asound.conf)

Re: Record android system audio

li-chen — Tue, 27 May 2014 19:57:24 GMT

Hi Rafael,

By alsa-ctl, do you mean tinymix? We have limited experience in setting up the asound.conf. Could you recommend a few links where we should read in order to configure asound.conf properly for capturing the sound on i.MX6? We found this link, http://permalink.gmane.org/gmane.linux.embedded.yocto.meta-freescale/5124, but we don't know exactly what parameters should be changed in order to capture system audio on i.MX6. Any pointer is greatly appreciated. Thanks again!