linux-kernel - Re: [alsa-devel] [PATCH] [SOUND] recording gain control

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Message-ID: <49B65B96.5080108@einfochips.com>
Date:	Tue, 10 Mar 2009 17:52:46 +0530
From:	Viral Mehta <viral.mehta@...fochips.com>
To:	Takashi Iwai <tiwai@...e.de>, perex@...ex.cz,
	Linux audio dev <linux-audio-dev@...ts.linuxaudio.org>
CC:	Clemens Ladisch <clemens@...isch.de>, alsa-devel@...a-project.org,
	linux-kernel@...r.kernel.org
Subject: Re: [alsa-devel] [PATCH] [SOUND] recording gain control

Takashi Iwai wrote:
> At Tue, 10 Mar 2009 10:00:13 +0100,
> Clemens Ladisch wrote:
>   
>> (CC alsa-devel)
>>
>> Viral Mehta wrote:
>>     
>>> Hi,
>>>
>>> I am trying to do gain control while RECORDING for my Audio Mic device.
>>>
>>> My application opens /dev/mixer device and calls ioctl(fdmixer, 
>>> MIXER_WRITE(SOUND_MIXER_MIC), ...)
>>>
>>> But, the call fails. It traces to sound/core/oss/mixer_oss.c file and 
>>> snd_mixer_oss_put_volume1() function.
>>> It never falls in "if (slot->present & SNDRV_MIXER_OSS_PRESENT_CVOLUME)" 
>>> as condition "if (slot->present & SNDRV_MIXER_OSS_PRESENT_PVOLUME) " 
>>> comes as false.
>>>
>>> I think there is a bug in kernel and I think it should be like as below,
>>>
>>> --- sound/core/oss/mixer_oss.c  2008-12-03 13:24:02.000000000 +0530
>>> +++ sound/core/oss/mixer_oss.c   2009-03-09 16:22:06.548766896 +0530
>>> @@ -688,7 +688,7 @@ static int snd_mixer_oss_put_volume1(str
>>>
>>>      if (slot->present & SNDRV_MIXER_OSS_PRESENT_PVOLUME) {
>>>              snd_mixer_oss_put_volume1_vol(fmixer, pslot, 
>>> slot->numid[SNDRV_MIXER_OSS_ITEM_PVOLUME], left, right);
>>> -               if (slot->present & SNDRV_MIXER_OSS_PRESENT_CVOLUME)
>>> +       } else if (slot->present & SNDRV_MIXER_OSS_PRESENT_CVOLUME) {
>>>                      snd_mixer_oss_put_volume1_vol(fmixer, pslot, 
>>> slot->numid[SNDRV_MIXER_OSS_ITEM_CVOLUME], left, right);
>>>      } else if (slot->present & SNDRV_MIXER_OSS_PRESENT_GVOLUME) {
>>>              snd_mixer_oss_put_volume1_vol(fmixer, pslot, 
>>> slot->numid[SNDRV_MIXER_OSS_ITEM_GVOLUME], left, right);
>>>       
>> Your mailer mangled the patch; see linux/Documentation/email-clients.txt.
>>     
>
> Also, the current code behaves intentionally so (as it's designed for
> mic-loopback volume).
>
> A more feasible fix would be to add another if check for *_CVOLUME
> instead of moving it.
>
>
>   
Oh okie. It makes sense.
I just sent out a patch on LAD. Should I resubmit with what you proposed ?

> Takashi
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