On Sun, 2016-06-05 at 10:16 +0200, pfl wrote:
> hello everyone,
>
> for a raspberrry applicance I need to setup the input volume of theÂ
> microphone programaticaly
>
> in c++, I can read the actual value (changed if I change it in the paÂ
> mixer), but as I set it, it does not seem to work...
>
> after I launched my code, I check in the pa panel mixer, the volume isÂ
> not changed
>
> below, the sources with their chanels and volumes
>
> > SOURCEÂ
> :[0]'alsa_output.usb-0d8c_C-Media_USB_Headphone_Set-00-Set.analog-stereo.monitor''MonitorÂ
> of Audio Adapter Analog Stereo'(0)=65536(1)=65536SOURCEÂ
> :[1]'alsa_input.usb-0d8c_C-Media_USB_Headphone_Set-00-Set.analog-mono''AudioÂ
> Adapter Analog Mono'(0)=26281SOURCEÂ
> :[2]'alsa_output.0.analog-stereo.monitor''Monitor of bcm2835 ALSA AnalogÂ
> Stereo'(0)=65536(1)=65536|
>
> so I try to change volume of source index #1
>
> > voidsetVolume(intindex,intvolume){pa_operation*o;currentVolume.values[0]=volume;if(!(oÂ
> =pa_context_set_source_output_volume(context,index,¤tVolume,NULL,NULL))){printf("pa_context_set_source_output_volume()Â
> failed");return;}printf("new volume:Â
> %d\n",currentVolume.values[0]);pa_operation_unref(o);}|
>
> please can someone help ?
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The problem is that you set the volume for a "source output" rather
than for a "source". A source output means a recording stream, while a
source is a device such as a microphone. Use
pa_context_set_source_volume_by_index() or
pa_context_set_source_volume_by_name().
--Â
Tanu
