Re: [pulseaudio-discuss] Changing Volume on Streams ( not Sinks )
On Mon, 2019-07-29 at 10:24 -0700, Brian Bulkowski wrote: > Thank you Georg! > > About 12 hours ago I figured it out too. > pa_context_set_sink_input_volume() is the function I was looking for, > and I was mistakenly using pa_context_set_sink_volume_by_index(), an > obvious flaw on my part. > > The other way to get a sink-input id directly from a Stream, you don't > need to list them all and find what you're looking for. That would be > 'pa_stream_get_index'. > > I would suggest adding a single sentence to the doc set --- > > 'pa_stream_get_index' should note that what is returned is a 'sink > input' or 'source output' id, depending on the type of stream. The note > there says "useful for functions such as" which are functions that take > those kinds of IDs, but a little clarity would be helpful. > > If there was a description somewhere in the doc set about the 4 > different id spaces ( more? ), at a higher level, that would be really > great. That finally clicked for me when I was looking at pacmd/pactl and > seeing how that tool lists things, see the different IDs and what you > can do with them. It doesn't really fit in any of the higher level > sections, because it applies to both simple and async and others > > I like PulseAudio quite a bit -- can I give back by trying to write up a > page? By a page, do you mean a new page or section in the doxygen documentation? Yes, documentation patches are very welcome! -- Tanu https://www.patreon.com/tanuk https://liberapay.com/tanuk ___ pulseaudio-discuss mailing list pulseaudio-discuss@lists.freedesktop.org https://lists.freedesktop.org/mailman/listinfo/pulseaudio-discuss
Re: [pulseaudio-discuss] Changing Volume on Streams ( not Sinks )
Thank you Georg! About 12 hours ago I figured it out too. pa_context_set_sink_input_volume() is the function I was looking for, and I was mistakenly using pa_context_set_sink_volume_by_index(), an obvious flaw on my part. The other way to get a sink-input id directly from a Stream, you don't need to list them all and find what you're looking for. That would be 'pa_stream_get_index'. I would suggest adding a single sentence to the doc set --- 'pa_stream_get_index' should note that what is returned is a 'sink input' or 'source output' id, depending on the type of stream. The note there says "useful for functions such as" which are functions that take those kinds of IDs, but a little clarity would be helpful. If there was a description somewhere in the doc set about the 4 different id spaces ( more? ), at a higher level, that would be really great. That finally clicked for me when I was looking at pacmd/pactl and seeing how that tool lists things, see the different IDs and what you can do with them. It doesn't really fit in any of the higher level sections, because it applies to both simple and async and others I like PulseAudio quite a bit -- can I give back by trying to write up a page? Thanks! On 7/29/2019 12:21 AM, Georg Chini wrote: On 28.07.19 19:44, Brian Bulkowski wrote: I posted yesterday, twice, about how the "stream get sink id" was going to solve my problems. In 10.0 ( the distro version on Debian Stretch on the Raspberry PI ), the "sink ID" returned from that call is not a valid sink ID and doesn't do anything good. I am hoping this call is more functional ( does anything functional ) in later revs, so I'm onward to upgrading to 12.2 or similar, before embarking on creating lots of extra Sinks in the configuration system. -brian Hi Brian, first, let me clarify the terminology pulseaudio is using: - The term "sink" is used for for an audio output, for example your speakers connected to your internal sound card or an USB or Bluetooth device. - The term "sink input" refers to an individual stream. A sink input can be connected to a sink. Then the stream will play on your output device. To list sink inputs, the function pa_context_get_sink_input_info_list() can be used. Then the volume can be changed with pa_context_set_sink_input_volume(). For complete documentation see https://freedesktop.org/software/pulseaudio/doxygen/ The functions I referenced above can be found at https://freedesktop.org/software/pulseaudio/doxygen/introspect_8h.html Regards Georg ___ pulseaudio-discuss mailing list pulseaudio-discuss@lists.freedesktop.org https://lists.freedesktop.org/mailman/listinfo/pulseaudio-discuss
Re: [pulseaudio-discuss] Changing Volume on Streams ( not Sinks )
On 28.07.19 19:44, Brian Bulkowski wrote: I posted yesterday, twice, about how the "stream get sink id" was going to solve my problems. In 10.0 ( the distro version on Debian Stretch on the Raspberry PI ), the "sink ID" returned from that call is not a valid sink ID and doesn't do anything good. I am hoping this call is more functional ( does anything functional ) in later revs, so I'm onward to upgrading to 12.2 or similar, before embarking on creating lots of extra Sinks in the configuration system. -brian Hi Brian, first, let me clarify the terminology pulseaudio is using: - The term "sink" is used for for an audio output, for example your speakers connected to your internal sound card or an USB or Bluetooth device. - The term "sink input" refers to an individual stream. A sink input can be connected to a sink. Then the stream will play on your output device. To list sink inputs, the function pa_context_get_sink_input_info_list() can be used. Then the volume can be changed with pa_context_set_sink_input_volume(). For complete documentation see https://freedesktop.org/software/pulseaudio/doxygen/ The functions I referenced above can be found at https://freedesktop.org/software/pulseaudio/doxygen/introspect_8h.html Regards Georg ___ pulseaudio-discuss mailing list pulseaudio-discuss@lists.freedesktop.org https://lists.freedesktop.org/mailman/listinfo/pulseaudio-discuss
Re: [pulseaudio-discuss] Changing Volume on Streams ( not Sinks )
Answering my own question, it seems that a Stream ( from the client API perspective ) creates a new Sink Input under the covers. Each Stream ends up with a unique Sink, which combine further down the line. The ID of that Sink Input can be grabbed with pa_stream_get_index, after it is up and running ( probably valid right after the stream connect callback ), and that index can be used to set volume. Whew, I think this has saved me a ton of work, although the amount of time spent finding the solution was kinda high :-) Hopefully this thread helps someone else in the same situation. Regards -brian ___ pulseaudio-discuss mailing list pulseaudio-discuss@lists.freedesktop.org https://lists.freedesktop.org/mailman/listinfo/pulseaudio-discuss
