[pulseaudio-discuss] PA re-sampling and mute/unmute query

[Himanshu Chug]

On Wed, Jun 29, 2011 at 10:06 PM, Tanu Kaskinen <tanuk at iki.fi> wrote:

> These questions seem to have gone unanswered...
>


Thanks Tanu :) for the reply.
I understand you and other senior members are busy with new release
activities and patch integrations, as seen from group activity,
thanks again for the reply and clarifications :)

one question here is, How to find out what sampling-rate that an particular
sink (e.g ALSA) is configured to ?
or in other words , how PA knows sampling-rate configuration of an sink (any
sink API's ? )? so that PA starts re-sampling to that particular
sample-rate.

Best Regards,
Himanshu




>
> On Wed, 2011-06-22 at 17:47 +0530, Himanshu Chug wrote:
> > Hi
> >
> > 1. I am trying to understand the how PA mixes two different freq streams,
> > say I am playing 2 playback streams one is 8000hz wav and other of 44100
> hz
> > wav at the same time ? how is re-sampling happens in PA level ? at what
> freq
> > PA re-sample given streams in this e.g  before mixing and rendering on
> > device?
>
> Each sink has some static sample rate configured. When the sink requests
> more data from the sink inputs, the input data is resampled to the
> sink's sample rate.
>
> > 2. Which part of PA code/ module is doing re-sampling and mixing here?
>
> When the sink implementation wants more data from the inputs, it calls
> pa_sink_render() or some of its variants.
>
> > 3. I want to mute/unmute sink inputs on the fly ( i.e when the stream is
> > running/playing), what PA API's can be used to achieve this ?
>
> Client api or internal server api? For clients there's
> pa_context_set_sink_input_mute(). The internal api has
> pa_sink_input_set_mute().
>
> --
> Tanu
>
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