[pulseaudio-discuss] cannot set volume in c++

[pfl]

hello everyone,

for a raspberrry applicance I need to setup the input volume of the 
microphone programaticaly

in c++, I can read the actual value (changed if I change it in the pa 
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 is 
not changed

below, the sources with their chanels and volumes

|SOURCE 
:[0]'alsa_output.usb-0d8c_C-Media_USB_Headphone_Set-00-Set.analog-stereo.monitor''Monitor 
of Audio Adapter Analog Stereo'(0)=65536(1)=65536SOURCE 
:[1]'alsa_input.usb-0d8c_C-Media_USB_Headphone_Set-00-Set.analog-mono''Audio 
Adapter Analog Mono'(0)=26281SOURCE 
:[2]'alsa_output.0.analog-stereo.monitor''Monitor of bcm2835 ALSA Analog 
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(!(o 
=pa_context_set_source_output_volume(context,index,&currentVolume,NULL,NULL))){printf("pa_context_set_source_output_volume() 
failed");return;}printf("new volume: 
%d\n",currentVolume.values[0]);pa_operation_unref(o);}|

please can someone help ?

thanks



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