>> 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 - >> >> > > -- > unsubscribe: [email protected] > website: http://groups.google.com/group/android-porting -- unsubscribe: [email protected] website: http://groups.google.com/group/android-porting
