[pulseaudio-discuss] pa_context_set_source_volume_by_index() failed

[pfl]

besides, how come I get a source and a sink if it is only an output ?


Le 26/10/2016 à 18:47, pfl a écrit :
> thanks for the infos, I am gonna check this now
>
> btw do you have any web page where everything is explained ? sources, 
> sinks, monitors, profiles.... all these
>
>
> Le 26/10/2016 à 18:41, Tanu Kaskinen a écrit :
>> On Tue, 2016-10-25 at 19:13 +0200, pfl wrote:
>>> hi,
>>>
>>> I try to set the volume on source #0 (the audio jack of my raspbery pi)
>>> but it does not work
>> There may be some confusion about the terminology. The audio jack on
>> Raspberry Pi is only for output, and "sources" in pulseaudio are for
>> recording input. I would guess that you're actually trying to set the
>> playback volume, so you're interested in the "sink" volume, not the
>> "source" volume.
>>
>>>       void setVolume(int index,int volume)  // where index is 0
>>>       {
>>>           pa_operation* o;
>>>           currentVolume.values[0]=volume;
>>>           if (!(o = pa_context_set_source_volume_by_index(context, 
>>> index,
>>> &currentVolume, NULL/*volumeCallback*/, NULL)))
>>>           {
>>>               printf("pa_context_set_source_volume_by_index() 
>>> failed\n");
>> You didn't say this explicitly, but from the mail subject I guess
>> pa_context_set_source_volume_by_index() returned NULL. That can happen
>> if currentVolume is invalid (you don't show how it's initialized, so I
>> don't know if this is the case), or if the connection to the server is
>> not yet ready or the connection has terminated. To debug this, you can
>> query the connection state with pa_context_get_state().
>>
>
>
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