The RIL, the baseband and voice calls

Sascha

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Aug 24, 2009, 10:15:44 AM8/24/09

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Hi all,

does andybody know if the baseband directly communicates with the
microphone and the headphones during a phone call or does it use the
android linux kernel for that purpose?

thanks
sascha

Dianne Hackborn

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Aug 24, 2009, 3:22:43 PM8/24/09

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It depends on the hardware. On the G1, this is all done by the baseband processor.

--
Dianne Hackborn
Android framework engineer
hac...@android.com

Note: please don't send private questions to me, as I don't have time to provide private support, and so won't reply to such e-mails. All such questions should be posted on public forums, where I and others can see and answer them.

Sascha

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Aug 24, 2009, 4:29:08 PM8/24/09

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Is there any hardware available where I could flash my custom os image
and where the android kernel delivers the audio to the gsm module?

On 24 Aug., 21:22, Dianne Hackborn <hack...@android.com> wrote:
> It depends on the hardware. On the G1, this is all done by the baseband
> processor.
>

> On Mon, Aug 24, 2009 at 7:15 AM, Sascha <sascha.f...@googlemail.com> wrote:
>
> > Hi all,
>
> > does andybody know if the baseband directly communicates with the
> > microphone and the headphones during a phone call or does it use the
> > android linux kernel for that purpose?
>
> > thanks
> > sascha
>
> --
> Dianne Hackborn
> Android framework engineer

> hack...@android.com

Dianne Hackborn

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Aug 24, 2009, 6:15:16 PM8/24/09

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No idea, sorry.

hac...@android.com

Demetris

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Aug 24, 2009, 6:27:15 PM8/24/09

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Hi everyone. I am trying to make ALSA work on Cupcake for TI OMAP which has the TWL4030 sound.

I tried to use the main branch alsa_sound and alsa-lib but keep getting an error:

hardware/alsa_sound/AudioHardwareALSA.cpp: In function 'android::AudioHardwareInterface* createAudioHardware()':

hardware/alsa_sound/AudioHardwareALSA.cpp:66: error: cannot allocate an object of abstract type 'android::AudioHardwareALSA'

hardware/alsa_sound/AudioHardwareALSA.h:246: note: because the following virtual functions are pure within 'android::AudioHardwareALSA':

the function is:

extern int snd_pcm_null_open(snd_pcm_t **pcmp,

const char *name,

snd_pcm_stream_t stream,

int mode);

//

// Function for dlsym() to look up for creating a new AudioHardwareInterface.

//

android::AudioHardwareInterface *createAudioHardware(void) {

return new android::AudioHardwareALSA();

}

If anyone managed to make ALSA work on OMAP for Cupcake please help out.

Any Git repository I can use would be appreciated.

I have all the permissions correct in the init.rc and /dev/snd is filled and everything is loading fine in the Kernel:

ALSA device list:

#0: overo (twl4030)

So it’s just Android.

Any help would be appreciated. The error I’m getting now from Android is this:

I/DEBUG ( 824): be820ab0 ab71d1e8 /system/lib/libaudio.so

I/DEBUG ( 824): be820ab4 ab71cce4 /system/lib/libaudio.so

I/ServiceManager( 931): Waiting for sevice media.audio_flinger...

W/AudioSystem( 931): AudioFlinger not published, waiting...

I/ServiceManager( 931): Waiting for sevice media.audio_flinger...

I/ ( 1199): ServiceManager: 0xac38

E/ALSALib ( 1199): external/alsa-lib/src/control/control.c:909:(snd_ctl_open_noupdate) Invalid CTL AndroidPlayback

E/AudioHardwareALSA( 1199): Unable to attach mixer to device AndroidPlayback: No such file or directory

E/AudioHardwareALSA( 1199): Unable to attach mixer to device default: No such file or directory

E/ALSALib ( 1199): external/alsa-lib/src/control/control.c:909:(snd_ctl_open_noupdate) Invalid CTL AndroidRecord

E/AudioHardwareALSA( 1199): Unable to attach mixer to device AndroidRecord: No such file or directory

E/AudioHardwareALSA( 1199): Unable to attach mixer to device default: No such file or directory

I/DEBUG ( 824): *** *** *** *** *** *** *** *** *** *** *** *** *** *** *** ***

I/DEBUG ( 824): Build fingerprint: 'generic/generic/generic/:1.5/CUPCAKE/eng.dima.20090824.190441:eng/test-keys'

I/DEBUG ( 824): pid: 1199, tid: 1199 >>> /system/bin/mediaserver <<<

I/DEBUG ( 824): signal 11 (SIGSEGV), fault addr 00000010

I/DEBUG ( 824): r0 00000000 r1 ab78782c r2 00000000 r3 00000000

I/DEBUG ( 824): r4 ab798004 r5 0000ad68 r6 be976a10 r7 ab01acd8

I/DEBUG ( 824): r8 0000b268 r9 00000000 10 ab797c68 fp be976ab4

I/DEBUG ( 824): ip 0000ad90 sp be976a08 lr ab71cdec pc ab74486c cpsr 00000010

I/DEBUG ( 824): #00 pc 0004486c /system/lib/libaudio.so

I/DEBUG ( 824): #01 pc 0001cde8 /system/lib/libaudio.so

I/DEBUG ( 824): #02 pc 0001d1e4 /system/lib/libaudio.so

I/DEBUG ( 824): #03 pc 0001d214 /system/lib/libaudio.so

I/DEBUG ( 824): #04 pc 00085fa8 /system/lib/libaudio.so

I/DEBUG ( 824): #05 pc 00016d92 /system/lib/libaudioflinger.so

I/DEBUG ( 824): #06 pc 00016f34 /system/lib/libaudioflinger.so

I/DEBUG ( 824): #07 pc 00008768 /system/bin/mediaserver

I/DEBUG ( 824): #08 pc 0001fd6a /system/lib/libc.so

I/DEBUG ( 824): #09 pc 0000bcb2 /system/lib/libc.so

I/DEBUG ( 824): #10 pc b000157e /system/bin/linker

I/DEBUG ( 824): stack:

I/DEBUG ( 824): be9769c8 00000001

I/DEBUG ( 824): be9769cc afe22689 /system/lib/libc.so

I/DEBUG ( 824): be9769d0 ab787828 /system/lib/libaudio.so

I/DEBUG ( 824): be9769d4 0000b279 [heap]

I/DEBUG ( 824): be9769d8 ab01acd8 /system/lib/libaudioflinger.so

I/DEBUG ( 824): be9769dc 0000b268 [heap]

I/DEBUG ( 824): be9769e0 00000000

I/DEBUG ( 824): be9769e4 ab797c68 /system/lib/libaudio.so

I/DEBUG ( 824): be9769e8 be976ab4 [stack]

I/DEBUG ( 824): be9769ec 0000b279 [heap]

I/DEBUG ( 824): be9769f0 00000003

I/DEBUG ( 824): be9769f4 afb05bcf /system/lib/libcutils.so

I/DEBUG ( 824): be9769f8 ab798004 /system/lib/libaudio.so

I/DEBUG ( 824): be9769fc 0000ad68 [heap]

I/DEBUG ( 824): be976a00 df002777

I/DEBUG ( 824): be976a04 e3a070ad

I/DEBUG ( 824): #01 be976a08 00000034

I/DEBUG ( 824): be976a0c 0000ada0 [heap]

I/DEBUG ( 824): be976a10 00000000

I/DEBUG ( 824): be976a14 00000000

I/DEBUG ( 824): be976a18 00000000

I/DEBUG ( 824): be976a1c 00000000

I/DEBUG ( 824): be976a20 00000000

I/DEBUG ( 824): be976a24 00000000

I/DEBUG ( 824): be976a28 00000000

I/DEBUG ( 824): be976a2c 00000000

I/DEBUG ( 824): be976a30 00000000

I/DEBUG ( 824): be976a34 00000000

I/DEBUG ( 824): be976a38 00000000

I/DEBUG ( 824): be976a3c 00000000

I/DEBUG ( 824): be976a40 00000000

I/DEBUG ( 824): be976a44 00000000

I/DEBUG ( 824): be976a48 00000000

I/DEBUG ( 824): be976a4c 00000000

I/DEBUG ( 824): be976a50 0000ab30 [heap]

I/DEBUG ( 824): be976a54 afe0ecf8 /system/lib/libc.so

I/DEBUG ( 824): be976a58 0000ab30 [heap]

I/DEBUG ( 824): be976a5c 000002dc

I/DEBUG ( 824): be976a60 fffef968

I/DEBUG ( 824): be976a64 00000230

I/DEBUG ( 824): be976a68 fffef258

I/DEBUG ( 824): be976a6c 0000ad90 [heap]

I/DEBUG ( 824): be976a70 0000b279 [heap]

I/DEBUG ( 824): be976a74 00000000

I/DEBUG ( 824): be976a78 ab798004 /system/lib/libaudio.so

I/DEBUG ( 824): be976a7c 0000ad90 [heap]

I/DEBUG ( 824): be976a80 000000dc

I/DEBUG ( 824): be976a84 3e4a2535

I/DEBUG ( 824): be976a88 00000000

I/DEBUG ( 824): be976a8c 0000ad90 [heap]

I/DEBUG ( 824): be976a90 0000ad68 [heap]

I/DEBUG ( 824): be976a94 0000acb0 [heap]

I/DEBUG ( 824): be976a98 ab01acd8 /system/lib/libaudioflinger.so

I/DEBUG ( 824): be976a9c 00000000

I/DEBUG ( 824): be976aa0 00000000

I/DEBUG ( 824): be976aa4 00000000

I/DEBUG ( 824): be976aa8 00000000

I/DEBUG ( 824): be976aac be976ab8 [stack]

I/DEBUG ( 824): be976ab0 ab71d1e8 /system/lib/libaudio.so

I/DEBUG ( 824): be976ab4 ab71cce4 /system/lib/libaudio.so

I/ServiceManager( 931): Waiting for sevice media.audio_flinger...

This is with the Cupcake ALSA files.

Sascha

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Aug 25, 2009, 3:05:10 PM8/25/09

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Do you know if the HTC RIL implementation touches the voicestream by
sending/receiving a phone call?

Dianne Hackborn

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Aug 25, 2009, 3:23:10 PM8/25/09

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No idea.

hac...@android.com

Dianne Hackborn

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Aug 25, 2009, 3:23:46 PM8/25/09

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Well wait, the RIL runs in the apps processor, so since the basebound processor is the only one that accessing the audio stream, then I would kind-of doubt it.

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