[pulseaudio-discuss] How to capture one of multiple radios that these radios play at the same time?

Tsai Yu-Chin yorjing at gmail.com
Tue Nov 23 18:34:16 PST 2010

Thanks a lot for you helps.
I can capture a single audio now when three radios play at the same time.

Is there any bug found after you ran a little test application to
check the function pa_stream_set_monitor_stream when recording?
If no, I think that I used this function in the wrong way.

When will the new version "PulseAudio" be released?
I think that new version "PulseAudio" will be more powerful if you fix
some bugs.

Thank you very much for your helps.

2010/11/22 Colin Guthrie <gmane at colin.guthr.ie>:
> 'Twas brillig, and Tsai Yu-Chin at 20/11/10 15:11 did gyre and gimble:
>> I have an idea but I am not sure that my idea is feasible.
>> I want to create many monitors and many sinks.
>> Assign one sink input per sink which is assigned to a monitor.
>> In other word, there is one sink input in one sink and there is one
>> sink in one monitor.
>> Maybe we can record separate audio using this approach.
>> But I don't know how to create sink and monitor in C code.
>> And how to create virtual device in C code.
>> Can you give me suggestions?
>> And can you teach me how to create sink, monitor and Virtual device in C code.
>> I can't find any relative information above on the web.
> Depending on your scenario, you can indeed create virtual sinks, ensure
> each stream plays to it's own "private" sink and then record directly
> from there.
> Do you really want to hear the audio out of a real sound card? (i.e. is
> the recording of the sound the primary goal?)
> If you *do* want to hear the sound, then I suggest either
> module-remap-sink or module-combine. Both of these allow you to piggy
> back on to a real sink. If you do not want to actually hear the sound,
> then module-null-sink is probably what you want.
> You could do something like the following:
> pactl load-module module-null-sink sink_name=radio1
> sink_properties=device.description=Radio1
> pactl load-module module-null-sink sink_name=radio2
> sink_properties=device.description=Radio2
> pactl load-module module-null-sink sink_name=radio3
> sink_properties=device.description=Radio3
> These three commands will create three virtual sinks (called Radio1,
> Radio2 and Radio3).
> You can then launch your radio player as follows:
> PULSE_SINK=radio1 myradioapp
> PULSE_SINK=radio2 myradioapp
> PULSE_SINK=radio3 myradioapp
> Or similar.
> Hope that helps.
> Col
> --
> Colin Guthrie
> gmane(at)colin.guthr.ie
> http://colin.guthr.ie/
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