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output/osx: add started flag

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This will keep track of AudioOutputUnitStart() and
AudioOutputUnitStop().  This will provide some separation between "not
(yet) (re)started" and "paused".
This commit is contained in:
Max Kellermann 2020-07-02 15:07:39 +02:00
parent 8125a5dddb
commit f032925c2d
1 changed files with 18 additions and 4 deletions
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22
src/output/plugins/OSXOutputPlugin.cxx
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@ -73,7 +73,14 @@ struct OSXOutput final : AudioOutput {
const char *device_name;
const char *const channel_map;
const bool hog_device;
bool pause;
/**
* Is the audio unit "started", i.e. was AudioOutputUnitStart() called?
*/
bool started;
#ifdef ENABLE_DSD
/**
* Enable DSD over PCM according to the DoP standard?
@ -755,18 +762,22 @@ OSXOutput::Open(AudioFormat &audio_format)
Apple::ThrowOSStatus(status, "Unable to start audio output");
pause = false;
started = true;
}
size_t
OSXOutput::Play(const void *chunk, size_t size)
{
assert(size > 0);
if (pause) {
pause = false;
if (!started) {
OSStatus status = AudioOutputUnitStart(au);
if (status != noErr)
throw std::runtime_error("Unable to restart audio output after pause");
pause = false;
started = true;
}
#ifdef ENABLE_DSD
if (dop_enabled) {
@ -797,10 +808,13 @@ OSXOutput::Delay() const noexcept
bool OSXOutput::Pause()
{
if (!pause) {
pause = true;
pause = true;
if (started) {
AudioOutputUnitStop(au);
started = false;
}
return true;
}