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output/pipewire: add flag "active", replaces some uses of "paused"

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This way, we know whether we're explicitly "paused" or "not yet
activated because the ring buffer hasn't been filled yet".
This commit is contained in:
Max Kellermann 2021-09-24 11:33:09 +02:00
parent 6ed4aff4d3
commit bad3283182
1 changed files with 20 additions and 8 deletions
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28
src/output/plugins/PipeWireOutputPlugin.cxx
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@ -93,6 +93,12 @@ class PipeWireOutput final : AudioOutput {
bool interrupted;
bool paused;
/**
* Is the PipeWire stream active, i.e. has
* pw_stream_set_active() been called successfully?
*/
bool active;
/**
* Has Drain() been called? This causes Process() to invoke
* pw_stream_flush() to drain PipeWire as soon as the
@ -353,11 +359,11 @@ PipeWireOutput::Open(AudioFormat &audio_format)
disconnected = false;
restore_volume = true;
/* we're paused (inactive) now because of the flag
PW_STREAM_FLAG_INACTIVE; this way, we can fill the
ring_buffer before activating the stream, to avoid
underruns */
paused = true;
paused = false;
/* stay inactive (PW_STREAM_FLAG_INACTIVE) until the ring
buffer has been filled */
active = false;
drain_requested = false;
drained = true;
@ -492,6 +498,8 @@ PipeWireOutput::Play(const void *chunk, size_t size)
{
const PipeWire::ThreadLoopLock lock(thread_loop);
paused = false;
while (true) {
CheckThrowError();
@ -502,11 +510,11 @@ PipeWireOutput::Play(const void *chunk, size_t size)
return bytes_written;
}
if (paused) {
if (!active) {
/* now that the ring_buffer is full, there is
enough data for Process(), so let's resume
the stream now */
paused = false;
active = true;
pw_stream_set_active(stream, true);
}
@ -547,7 +555,11 @@ PipeWireOutput::Pause() noexcept
interrupted = false;
paused = true;
pw_stream_set_active(stream, false);
if (active) {
active = false;
pw_stream_set_active(stream, false);
}
return true;
}