2011/2/7 Vincent Meserette vmeserette@aldebaran-robotics.com

Hi Raymond,

Thanks for your reply.

To reply to your question, indeed the AD1989A codec is seen by alsa as a device containing three subdevices (the three ADC) :

result of arecord -l : List of CAPTURE Hardware Devices :

card 0: MID [HDA Intel MID], device 0: AD198x Analog [AD198x Analog]

Subdevices: 3/3 Subdevice #0: subdevice #0 Subdevice #1: subdevice #1 Subdevice #2: subdevice #2

To record four channels simultaneously, I have created the following alsa configuration file :

*# output device pcm.AD1989A{ type hw card 0 }

# input device* * pcm.quad { type multi

    slaves.a.pcm "hw:0,0,0" # ADC 0 of the codec (left and right mics)
    slaves.a.channels 2
    slaves.b.pcm "hw:0,0,1" # ADC 1 of the codec (front and rear mics)
    slaves.b.channels 2

    bindings.0.slave a
    bindings.0.channel 0
    bindings.1.slave a
    bindings.1.channel 1
    bindings.2.slave b
    bindings.2.channel 0
    bindings.3.slave b
    bindings.3.channel 1

}

# input device containing interleaved data pcm.quad2 { type route slave.pcm "quad" ttable.0.0 1 ttable.1.1 1 ttable.2.2 1 ttable.3.3 1 }

### CTL DEVICES (controls) ctl.mixer0 { type hw card 0 }*

With this configuration file, I am able to record the four channels simultaneously with the following command :

arecord -c4 -fS16_LE -r48000 -D «quad2 » -d5 /tmp/recording.wav

I found from where came my problem with the capture gains by adding some logs in the hda_codec.c file. When I set one of the capture gain, the put_vol_mute function well write in the AMP_GAIN_MUTE verb of the corresponding ADC selector (0x0c, 0x0d or 0x0e widget) but the mute bit is always set to 1. Indeed, the value associated to the AMP_GAIN_MUTE verb is formated as folow : bits 0 to 6 : gain bit 7 : mute bits 8 to 11 : index bit 12 : set right amp bit 13 : set left amp bit 14 : set input amp bit 15 : set output amp

and alsa sets the value of this register from a080 / b080 to a0b6 / b0b6 when i change the gain from -58.5 dB to 22.5dB

Do you know how alsa and thus the alsamixer determine the minimum and maximum values for the capture gain, and how to say to alsa the the gain is only a 7bits step value ?

Thanks in advance.

Best regards

Vincent

2011/2/5 Raymond Yau superquad.vortex2@gmail.com

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2011/2/3 Vincent Meserette vmeserette@aldebaran-robotics.com

...

Hi Raymond,

Many thanks for your answer.

Looking the AD1989A datasheet (which can be found here : http://www.conexant.com/products/entry.jsp?id=599) the vendor id of the codec seems to be 11D4989A So, I think the codec taken into account in the "patch_analog.c" file is well the AD1989A because I found these lines in the source code :

/*

• patch entries

*/ static struct hda_codec_preset snd_hda_preset_analog[] = { ... { .id = 0x11d4989a, .name = "AD1989A", .patch = patch_ad1988 }, ... {} /* terminator */ };

Concerning the digital microphone input of the codec, I don't use it. I have four electret microphones connected to the B and C ports of the

codec

...

(one on the PORT-B_L pin, one on the PORT-B_R pin, one on the PORT-C_L

pin

...

and one on the PORT-C_R pin). I have connected by software configuration

the

...

port B to the ADC1 and the port C to the ADC0. Maybe my problem comes from here, because I don't use the codec in a standard configuration ? if it is the case, do you know how can i resolve it ? Do you also know which registers control the three capture gains of the alsamixerl (i thought it was the gains of the ADC0, ADC1 and ADC2 )?

can you post the output of alsa-info.sh

Six 192kHz 92dB ADCs

• simultaneous record of up to 3 stereo channels

It does not imply you can record 4 channels with the existing hda driver which create three subdevices

when recording with 4 channels using audacity with my ad1988a, audacity hang after a few seconds or half minute

Does snd-hda-inel really suport SNDRV_PCM_INFO_SYNC_START ?

ALSA pcm_lib.c:374: period_update: pcmC0D0c:0: pos=0/1216/4864, hwptr=1216/314944/316160/311296 ALSA pcm_lib.c:374: period_update: pcmC0D0c:1: pos=1/1216/4864, hwptr=1216/314945/316161/311296 ALSA pcm_lib.c:374: period_update: pcmC0D0c:0: pos=1216/1216/4864, hwptr=1207/316169/317376/316160 ALSA pcm_lib.c:374: period_update: pcmC0D0c:1: pos=1217/1216/4864, hwptr=1216/316161/317377/316160 ALSA pcm_lib.c:374: period_update: pcmC0D0c:0: pos=2432/1216/4864, hwptr=1216/317376/318592/316160 ALSA pcm_lib.c:374: period_update: pcmC0D0c:1: pos=2433/1216/4864, hwptr=1216/317377/318593/316160 ALSA pcm_lib.c:374: period_update: pcmC0D0c:0: pos=3648/1216/4864, hwptr=1199/318609/319808/316160 ALSA pcm_lib.c:374: period_update: pcmC0D0c:1: pos=3649/1216/4864, hwptr=1216/318593/319809/316160 ALSA pcm_lib.c:374: period_update: pcmC0D0c:0: pos=0/1216/4864, hwptr=1216/319808/321024/316160 ALSA pcm_lib.c:374: period_update: pcmC0D0c:1: pos=1/1216/4864, hwptr=1216/319809/321025/316160 ALSA pcm_lib.c:374: period_update: pcmC0D0c:0: pos=1216/1216/4864, hwptr=1207/321033/322240/321024 ALSA pcm_lib.c:374: period_update: pcmC0D0c:1: pos=1217/1216/4864, hwptr=1216/321025/322241/321024 ALSA pcm_lib.c:374: period_update: pcmC0D0c:0: pos=2432/1216/4864, hwptr=1216/322240/323456/321024 ALSA pcm_lib.c:374: period_update: pcmC0D0c:1: pos=2433/1216/4864, hwptr=1216/322241/323457/321024 ALSA pcm_lib.c:374: period_update: pcmC0D0c:0: pos=3648/1216/4864, hwptr=1199/323473/324672/321024 ALSA pcm_lib.c:374: period_update: pcmC0D0c:1: pos=3649/1216/4864, hwptr=1216/323457/324673/321024 ALSA pcm_lib.c:374: period_update: pcmC0D0c:0: pos=0/1216/4864, hwptr=1216/324672/325888/321024 ALSA pcm_lib.c:374: period_update: pcmC0D0c:1: pos=1/1216/4864, hwptr=1216/324673/325889/321024 ALSA pcm_lib.c:374: period_update: pcmC0D0c:0: pos=1216/1216/4864, hwptr=1184/325920/327104/325888 ALSA pcm_lib.c:374: period_update: pcmC0D0c:1: pos=1217/1216/4864, hwptr=1216/325889/327105/325888 ALSA pcm_lib.c:374: period_update: pcmC0D0c:0: pos=2432/1216/4864, hwptr=1216/327104/328320/325888 ALSA pcm_lib.c:374: period_update: pcmC0D0c:1: pos=2433/1216/4864, hwptr=1216/327105/328321/325888 ALSA pcm_lib.c:374: period_update: pcmC0D0c:0: pos=3648/1216/4864, hwptr=1215/328321/329536/325888 ALSA pcm_lib.c:374: period_update: pcmC0D0c:1: pos=3649/1216/4864, hwptr=1216/328321/329537/325888 ALSA pcm_lib.c:374: period_update: pcmC0D0c:0: pos=0/1216/4864, hwptr=1216/329536/330752/325888 ALSA pcm_lib.c:374: period_update: pcmC0D0c:1: pos=1/1216/4864, hwptr=1216/329537/330753/325888

ALSA pcm_lib.c:172: XRUN: pcmC0D0c:1

[<f895f201>] xrun+0x97/0x9e [snd_pcm] [<f895f859>] snd_pcm_update_state+0x74/0xc1 [snd_pcm] [<f895fe03>] snd_pcm_update_hw_ptr0+0x55d/0x569 [snd_pcm] [<c042823f>] ? default_wake_function+0xb/0xd [<c0421fd3>] ? __wake_up+0x31/0x3b [<f895fe89>] snd_pcm_period_elapsed+0x7a/0xe9 [snd_pcm] [<f8a41744>] azx_interrupt+0x99/0x120 [snd_hda_intel] [<c046548f>] handle_IRQ_event+0x2f/0x64 [<c04664f8>] handle_fasteoi_irq+0x85/0xc0 [<c0466473>] ? handle_fasteoi_irq+0x0/0xc0 [<c0406e6e>] do_IRQ+0xc7/0xfe [<c0405668>] common_interrupt+0x28/0x30 [<c040a112>] ? mwait_idle+0x38/0x4b [<c0403c61>] cpu_idle+0x101/0x134 [<c06a7db4>] start_secondary+0x197/0x19f

======================= ALSA hda_intel.c:1679: azx_pcm_prepare: bufsize=0x4c00, format=0x11 ALSA hda_codec.c:1228: hda_codec_setup_stream: NID=0x8, stream=0x1, channel=0, format=0x11 ALSA hda_intel.c:1679: azx_pcm_prepare: bufsize=0x4c00, format=0x11 ALSA hda_codec.c:1228: hda_codec_setup_stream: NID=0x9, stream=0x2, channel=0, format=0x11 ALSA hda_intel.c:1679: azx_pcm_prepare: bufsize=0x4c00, format=0x11 ALSA hda_codec.c:1228: hda_codec_setup_stream: NID=0x8, stream=0x1, channel=0, format=0x11 ALSA hda_intel.c:1679: azx_pcm_prepare: bufsize=0x4c00, format=0x11 ALSA hda_codec.c:1228: hda_codec_setup_stream: NID=0x9, stream=0x2, channel=0, format=0x11 ALSA hda_codec.c:1291: hda_codec_cleanup_stream: NID=0x8 ALSA hda_codec.c:1291: hda_codec_cleanup_stream: NID=0x9 ALSA hda_codec.c:1291: hda_codec_cleanup_stream: NID=0x8 ALSA hda_codec.c:1291: hda_codec_cleanup_stream: NID=0x9