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[client] audio: allow the audiodev to return the periodFrames

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This change allows the audiodevs to return the minimum period frames
needed to start playback instead of having to rely on a pull to obtain
these details.

Additionally we are using this information to select an initial start
latency as well as to train the desired latency in order to keep it as
low as possible.
This commit is contained in:
Geoffrey McRae
2022-01-27 17:20:28 +11:00
parent dd2d84a080
commit 41884bfcc5
4 changed files with 69 additions and 50 deletions
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14
client/audiodevs/PulseAudio/pulseaudio.c
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@@ -37,7 +37,6 @@ struct PulseAudio
int sinkIndex;
bool sinkCorked;
bool sinkMuted;
int sinkStart;
int sinkSampleRate;
int sinkChannels;
int sinkStride;
@@ -246,7 +245,7 @@ static void pulseaudio_overflow_cb(pa_stream * p, void * userdata)
}
static void pulseaudio_setup(int channels, int sampleRate,
LG_AudioPullFn pullFn)
LG_AudioPullFn pullFn, int * periodFrames)
{
if (pa.sink && pa.sinkChannels == channels && pa.sinkSampleRate == sampleRate)
return;
@@ -286,26 +285,21 @@ static void pulseaudio_setup(int channels, int sampleRate,
pa.sinkStride = channels * sizeof(float);
pa.sinkPullFn = pullFn;
pa.sinkStart = attribs.tlength / pa.sinkStride;
pa.sinkCorked = true;
*periodFrames = attribs.tlength / pa.sinkStride;
pa_threaded_mainloop_unlock(pa.loop);
}
static bool pulseaudio_start(int framesBuffered)
static void pulseaudio_start(void)
{
if (!pa.sink)
return false;
if (framesBuffered < pa.sinkStart)
return false;
return;
pa_threaded_mainloop_lock(pa.loop);
pa_stream_cork(pa.sink, 0, NULL, NULL);
pa.sinkCorked = false;
pa_threaded_mainloop_unlock(pa.loop);
return true;
}
static void pulseaudio_stop(void)