Hi Misa
Thanks a lot for your explaination.You were crystal clear in your
replies.I have one more doubt.A non-technical one.Ah, in the Android source
provided by Embinux, the kernel has ALSA SOC(ASOC) support only for
OMAP3Beagle board and it doesn't have the ALSA SOC support for OMAP3EVM
board.Without this ASOC support for OMAP3EVM Board we cant have Audio
working on OMAP3EVM board.So, do you have any idea of how to go about in
enabling ASOC for OMAP3EVM board?
Thanks & Regards
Aney
On Tue, Nov 24, 2009 at 12:28 PM, Misael Lopez <[email protected]> wrote:
> >> Q1.when i give : #alsa_amixer contents i see a lot of interfaces with
> >> different values set as default.So before capturing audio do i need to
> >> select a particular interface as capture source?Say for example i have
> >> something like:
> >>
> >> numid=17,iface=MIXER,name='Analog Left Capture Route'
> >> ; type=ENUMERATED,access=rw------,values=1,items=5
> >> ; Item #0 'Off'
> >> ; Item #1 'Main mic'
> >> ; Item #2 'Headset mic'
> >> ; Item #3 'AUXL'
> >> ; Item #4 'Carkit mic'
> >> : values=0
>
> That specific control select the analog source for the left channel on
> the TWL4030 codec.
> You should set it to the input you are interested in capture from,
> using alsa_mixer.
> There is a similar control for the analog source for right channel.
>
> >> Q2.Could you tell me how to set values for the above interface using
> >> alsa_amixer?I wanted to choose 'AUXL' present above.How must i enable
> >> it ?
>
> alsa_amixer is the renamed version of ALSA's amixer utility. To select
> AUXL you can do:
>
> alsa_amixer cset numid=17 3
>
> >> 'values=1' what does this mean?
>
> It means that the control can have a single value. Consider the case
> of a stereo volume control, it should have values=2 as you can set the
> volume (value) for each channel.
>
> >> Q3.I am bit confused about line-in and mic-in.whats the difference
> >> between line-in and mic-in?From the Beagle Board schematics i found
> >> out that it uses line-in.Does this mean that i cannot capture audio
> >> via my microphone ?If at all i need to record my own voice how can i
> >> do it?
>
> I think mic-in has a mic bias, and line-in does not. You should also
> ensure that the analog sources are selected accordingly.
>
> Regards,
> -Misa
>
> 2009/11/24 ani <[email protected]>:
> > Please answer this question as i also have same queries!!
> >
> > On Nov 18, 10:57 pm, aney <[email protected]> wrote:
> >> Hi Ben
> >>
> >> >I think that you should be able to symlink alsa_arecord to the
> alsa_aplay binary for recording:
> >>
> >> You are spot on!!! I was able to symlink alsa_arecord to
> >> alsa_aplay.Now i am able to capture audio using alsa_arecord:-)I
> >> connected the Line-in of my Media Player to the line-in on my
> >> beagleboard.I used the alsa_arecord application for capturing audio
> >> and i could play it back sucessfully:-)thanks a lot for your
> >> suggestion Ben.
> >>
> >> >What does your logcat output look like? Any audio errors?
> >>
> >> I dont get any audio errors.
> >>
> >> >What's the sound chip on the Beagle?
> >>
> >> The beagle board uses TWL4030 as its sound chip.It
> >> performs as an audio codec engine as well as a power module.when i
> >> do : #cat /proc/asound/cards i get the following:
> >>
> >> 0 [omap3beagle ]: twl4030 - omap3beagle
> >> omap3beagle (twl4030)
> >>
> >> > Do you have an /etc/asound.conf defined?
> >>
> >> No i dont have /etc/asound.conf file.Is there any serious
> >> consequence i might experience for not having this file?
> >>
> >> Ben i have a couple of questions for you.Could you kindly clarify it ?
> >>
> >> Q1.when i give : #alsa_amixer contents i see a lot of interfaces with
> >> different values set as default.So before capturing audio do i need to
> >> select a particular interface as capture source?Say for example i have
> >> something like:
> >>
> >> numid=17,iface=MIXER,name='Analog Left Capture Route'
> >> ; type=ENUMERATED,access=rw------,values=1,items=5
> >> ; Item #0 'Off'
> >> ; Item #1 'Main mic'
> >> ; Item #2 'Headset mic'
> >> ; Item #3 'AUXL'
> >> ; Item #4 'Carkit mic'
> >> : values=0
> >>
> >> Q2.Could you tell me how to set values for the above interface using
> >> alsa_amixer?I wanted to choose 'AUXL' present above.How must i enable
> >> it ?'values=1' what does this mean?
> >>
> >> Q3.I am bit confused about line-in and mic-in.whats the difference
> >> between line-in and mic-in?From the Beagle Board schematics i found
> >> out that it uses line-in.Does this mean that i cannot capture audio
> >> via my microphone ?If at all i need to record my own voice how can i
> >> do it?
> >>
> >> Thanks & Regards
> >> Ananth
> >>
> >> On Nov 17, 6:46 am, Ben Friedberg <[email protected]> wrote:
> >>
> >> > Ananth,
> >>
> >> > I think that you should be able to symlink alsa_arecord to the
> >> > alsa_aplay binary for recording. What does your logcat output look
> >> > like? Any audio errors? What's the sound chip on the Beagle? Do you
> >> > have an /etc/asound.conf defined? For recording, one thing that I
> >> > found (can't remember where, unfortunately, but prolly on this board)
> >> > was that my sound hardware couldn't handle alsa's default 2-channel
> >> > record. I had to enable 1-channel record on the default device with
> >> > this:
> >>
> >> > include: git diff external/alsa-lib/include/config.h
> >> > diff --git a/include/config.h b/include/config.h
> >> > index 52dfc11..9b6ce18 100644
> >> > --- a/include/config.h
> >> > +++ b/include/config.h
> >> > @@ -46,10 +46,11 @@
> >> > /* #undef BUILD_PCM_PLUGIN_MULAW */
> >>
> >> > /* Build PCM rate plugin */
> >> > /* #undef BUILD_PCM_PLUGIN_RATE */
> >>
> >> > /* Build PCM route plugin */
> >> > /* #undef BUILD_PCM_PLUGIN_ROUTE */
> >> > +#define BUILD_PCM_PLUGIN_ROUTE "1"
> >>
> >> > /* Build raw MIDI component */
> >> > /* #undef BUILD_RAWMIDI */
> >>
> >> > and updating this line in hardware/alsa_sound/AudioHardwareALSA.cpp:
> >>
> >> > if (err < 0) {
> >> > // None of the Android defined audio devices exist. Open a
> >> > generic one.
> >> > //**** THIS ONE -> devName = "hw:00,0";
> >> > devName = "default"; //This is the line you want
> >> > err = snd_pcm_open(&mHandle, devName, mDefaults->direction,
> >> > 0);
> >> > if (err < 0) {
> >> > // Last resort is the NULL device (i.e. the bit bucket).
> >> > devName = _nullALSADeviceName;
> >> > err = snd_pcm_open(&mHandle, devName,
> mDefaults->direction, 0);
> >>
> >> > }
> >> > }
> >>
> >> > On Nov 13, 10:15 pm, aney <[email protected]> wrote:
> >>
> >> > > Hi all
> >> > > I am working on TI's Beagle board running Android kernel on top
> of
> >> > > it.I am validating Audio Interface on Beagle board. I tested
> Audio-out
> >> > > by playing media file using Mediaplayer application.Audio out is
> >> > > fine.Now i am facing problems in capturing Audio.I connect the
> Mic-in
> >> > > of headset to audio-in on Beagle board and run the TonePicker and
> >> > > SoundRecorder applications for capturing audio.But the size of the
> >> > > captured file is always 0 bytes. Can someone tell me which
> application
> >> > > to use for capturing audio?Can alsa utils be used for capturing
> audio?
> >> > > The external/alsa_utils/aplay/aplay.c file speaks about audio
> >> > > recording and playback.Can it be used for capturing audio?
> >>
> >> > > Thanks & Regards
> >> > > Ananth- Hide quoted text -
> >>
> >> > - Show quoted text -
> >>
> >>
> >
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