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Don't try to be clever and stall the audio thread while we await samples. Start audio output earlier to allow it some extra warmup time.

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This commit is contained in:
Cameron Gutman 2014-10-20 13:18:23 -04:00
parent b1938610dd
commit 35e2ca1e00
1 changed files with 28 additions and 13 deletions
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41
Limelight/Connection.m
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@ -106,7 +106,6 @@ void ArRelease(void)
void ArStart(void) void ArStart(void)
{ {
printf("Start audio\n"); printf("Start audio\n");
AudioOutputUnitStart(audioUnit);
} }
void ArStop(void) void ArStop(void)
@ -292,6 +291,13 @@ void ClDisplayTransientMessage(char* message)
NSLog(@"Unable to initialize audioUnit: %d", (int32_t)status); NSLog(@"Unable to initialize audioUnit: %d", (int32_t)status);
} }
// We start here because it seems to need some warmup time
// before it starts accepting samples
status = AudioOutputUnitStart(audioUnit);
if (status) {
NSLog(@"Unable to start audioUnit: %d", (int32_t)status);
}
return self; return self;
} }
@ -305,9 +311,15 @@ static OSStatus playbackCallback(void *inRefCon,
// Fill them up as much as you can. Remember to set the size value in each buffer to match how // Fill them up as much as you can. Remember to set the size value in each buffer to match how
// much data is in the buffer. // much data is in the buffer.
bool ranOutOfData = false;
for (int i = 0; i < ioData->mNumberBuffers; i++) { for (int i = 0; i < ioData->mNumberBuffers; i++) {
ioData->mBuffers[i].mNumberChannels = 2; ioData->mBuffers[i].mNumberChannels = 2;
if (ranOutOfData) {
ioData->mBuffers[i].mDataByteSize = 0;
continue;
}
if (ioData->mBuffers[i].mDataByteSize != 0) { if (ioData->mBuffers[i].mDataByteSize != 0) {
int thisBufferOffset = 0; int thisBufferOffset = 0;
@ -317,19 +329,22 @@ static OSStatus playbackCallback(void *inRefCon,
continue; continue;
} }
// Wait for a buffer to be available
// FIXME: This needs optimization to avoid busy waiting for buffers
struct AUDIO_BUFFER_QUEUE_ENTRY *audioEntry = NULL; struct AUDIO_BUFFER_QUEUE_ENTRY *audioEntry = NULL;
while (audioEntry == NULL)
{ [audioLock lock];
[audioLock lock]; if (audioBufferQueue != NULL) {
if (audioBufferQueue != NULL) { // Dequeue this entry temporarily
// Dequeue this entry temporarily audioEntry = audioBufferQueue;
audioEntry = audioBufferQueue; audioBufferQueue = audioBufferQueue->next;
audioBufferQueue = audioBufferQueue->next; audioBufferQueueLength--;
audioBufferQueueLength--; }
} [audioLock unlock];
[audioLock unlock];
if (audioEntry == NULL) {
// No data left
ranOutOfData = true;
ioData->mBuffers[i].mDataByteSize = thisBufferOffset;
continue;
} }
// Figure out how much data we can write // Figure out how much data we can write