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[client] audio/pw: get the period size to determine when to start audio

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Previously this was hardcoded to 100ms which is far too high in most
instances, instead we get the initial period size and use whichever is
greater out of 50ms or the period size.

The idea is to reduce the amount of time it takes for the latency to
come down after initial stream start.
This commit is contained in:
Geoffrey McRae 2022-01-28 12:08:58 +11:00
parent 22b968ff53
commit 5bbc1d44bf
1 changed files with 17 additions and 4 deletions
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21
client/audiodevs/PipeWire/pipewire.c
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@ -104,6 +104,16 @@ static void pipewire_onPlaybackProcess(void * userdata)
if (pw.playback.rateMatch && pw.playback.rateMatch->size > 0)
frames = min(frames, pw.playback.rateMatch->size);
// stream was started just to get the initial period size
if (pw.playback.startFrames == -1)
{
pw.playback.startFrames = frames;
pw_stream_set_active(pw.playback.stream, false);
sbuf->datas[0].chunk->size = 0;
pw_stream_queue_buffer(pw.playback.stream, pbuf);
return;
}
frames = pw.playback.pullFn(dst, frames);
if (!frames)
{
@ -209,7 +219,7 @@ static void pipewire_playbackSetup(int channels, int sampleRate,
pw.playback.sampleRate = sampleRate;
pw.playback.stride = sizeof(float) * channels;
pw.playback.pullFn = pullFn;
pw.playback.startFrames = maxLatencyFrames;
pw.playback.startFrames = -1;
pw_thread_loop_lock(pw.thread);
pw.playback.stream = pw_stream_new_simple(
@ -247,11 +257,13 @@ static void pipewire_playbackSetup(int channels, int sampleRate,
PW_ID_ANY,
PW_STREAM_FLAG_AUTOCONNECT |
PW_STREAM_FLAG_MAP_BUFFERS |
PW_STREAM_FLAG_RT_PROCESS |
PW_STREAM_FLAG_INACTIVE,
PW_STREAM_FLAG_RT_PROCESS,
params, 1);
pw_thread_loop_unlock(pw.thread);
while(pw.playback.startFrames == -1)
pw_thread_loop_wait(pw.thread);
}
static bool pipewire_playbackStart(int framesBuffered)
@ -268,7 +280,8 @@ static bool pipewire_playbackStart(int framesBuffered)
switch (pw.playback.state)
{
case STREAM_STATE_INACTIVE:
if (framesBuffered >= pw.playback.startFrames)
if (framesBuffered >= max(pw.playback.startFrames,
pw.playback.sampleRate / 20)) //50ms
{
pw_stream_set_active(pw.playback.stream, true);
pw.playback.state = STREAM_STATE_ACTIVE;