[LAD] [Fwd: Audio mixer recording gain control]

Hello all,
I would like to know feedback here if possible. Or is it a wrong place
to submit patches which I "think" fixes some issue in oss simulation layer ?

> 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,
>
> --- a/sound/core/oss/mixer_oss.c 2008-12-03 13:24:02.000000000 +0530
> +++ b/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);
>
>
> Thanks,
> Viral
>
>
>
>
>
>

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