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audio: Fix locking in backends that manage their own callback threads.

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Otherwise you might get a race where an app pauses the device, but
the audio callback still manages to run after the pause is in place.
This commit is contained in:
Ryan C. Gordon
2022-05-20 21:07:25 -04:00
parent a95f5a792c
commit dc62fec5e9
6 changed files with 59 additions and 60 deletions
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12
src/audio/coreaudio/SDL_coreaudio.m
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@@ -522,8 +522,12 @@ static void
outputCallback(void *inUserData, AudioQueueRef inAQ, AudioQueueBufferRef inBuffer)
{
SDL_AudioDevice *this = (SDL_AudioDevice *) inUserData;
SDL_LockMutex(this->mixer_lock);
if (SDL_AtomicGet(&this->hidden->shutdown)) {
return; /* don't do anything. */
SDL_UnlockMutex(this->mixer_lock);
return; /* don't do anything, since we don't even want to enqueue this buffer again. */
}
if (!SDL_AtomicGet(&this->enabled) || SDL_AtomicGet(&this->paused)) {
@@ -536,10 +540,8 @@ outputCallback(void *inUserData, AudioQueueRef inAQ, AudioQueueBufferRef inBuffe
while (remaining > 0) {
if (SDL_AudioStreamAvailable(this->stream) == 0) {
/* Generate the data */
SDL_LockMutex(this->mixer_lock);
(*this->callbackspec.callback)(this->callbackspec.userdata,
this->hidden->buffer, this->hidden->bufferSize);
SDL_UnlockMutex(this->mixer_lock);
this->hidden->bufferOffset = 0;
SDL_AudioStreamPut(this->stream, this->hidden->buffer, this->hidden->bufferSize);
}
@@ -565,10 +567,8 @@ outputCallback(void *inUserData, AudioQueueRef inAQ, AudioQueueBufferRef inBuffe
UInt32 len;
if (this->hidden->bufferOffset >= this->hidden->bufferSize) {
/* Generate the data */
SDL_LockMutex(this->mixer_lock);
(*this->callbackspec.callback)(this->callbackspec.userdata,
this->hidden->buffer, this->hidden->bufferSize);
SDL_UnlockMutex(this->mixer_lock);
this->hidden->bufferOffset = 0;
}
@@ -587,6 +587,8 @@ outputCallback(void *inUserData, AudioQueueRef inAQ, AudioQueueBufferRef inBuffe
AudioQueueEnqueueBuffer(this->hidden->audioQueue, inBuffer, 0, NULL);
inBuffer->mAudioDataByteSize = inBuffer->mAudioDataBytesCapacity;
SDL_UnlockMutex(this->mixer_lock);
}
static void