Re: AudioQueueDispose vs. AudioQueueStop
Re: AudioQueueDispose vs. AudioQueueStop
- Subject: Re: AudioQueueDispose vs. AudioQueueStop
- From: Craig Hopson <email@hidden>
- Date: Mon, 22 Sep 2008 11:46:24 -0600
John,
You are calling:
AudioQueueStop(myData.audioQueue, false);
And then immediately disposing of the queue (buffers). This is bad.
Please read the documentation re: AudioQueueStop.
Whether you tell the audio queue to stop immediately or not, you are
better off (I think) adding a property listener to the queue for the
kAudioQueueProperty_IsRunning property and only dispose of the queue
when it signals that it actually has stopped.
-Craig
On Sep 21, 2008, at 9:50 AM, John Zorko wrote:
Hello, all ...
So i'm working on this streaming application, and it streams and
plays the first item in my list fine ... but when I try to start
playing another item (hence stopping the first), things get wonky.
I'm apparently not stopping the audio queue correctly. The relevant
parts of my code follow (based heavily on AudioFileStreamExample),
but I don't know the difference between AudioQueueDispose and
AudioQueueStop. How does one stop an audio queue quickly (_can_ an
audio queue be stopped quickly?) so another queue can be started?
- (void)playStream:(Song *)streamToPlay
{
keepRunningThread = 0; // tell current thread to stop
while(myData.playing == YES) // wait for it to stop
{
[[NSRunLoop currentRunLoop] runMode:NSDefaultRunLoopMode
beforeDate:nil];
}
// ... and start a new one with the new stream to play
NSLog(@"starting thread to play mp3 stream %s", [streamToPlay.mp3
UTF8String]);
[NSThread detachNewThreadSelector:@selector(connectAndPlayStream:)
toTarget:self withObject:streamToPlay];
}
- (void)connectAndPlayStream:(Song *)streamToPlay
{
NSAutoreleasePool *pool = [[NSAutoreleasePool alloc] init];
myData.playing = YES;
keepRunningThread = 1;
// initialize a mutex and condition so that we can block on buffers
in use.
pthread_mutex_init(&myData.mutex, NULL);
pthread_cond_init(&myData.cond, NULL);
OSStatus err = AudioFileStreamOpen(&myData, MyPropertyListenerProc,
MyPacketsProc,
kAudioFileAAC_ADTSType, &myData.audioFileStream);
if (err)
{
NSLog(@"AudioFileOStreamOpen error %d", err);
}
NSString *url = @"http://he3.magnatune.com/all/";;
url = [url stringByAppendingString:streamToPlay.mp3];
NSURLRequest *request = [NSURLRequest requestWithURL:[NSURL
URLWithString:[url
stringByAddingPercentEscapesUsingEncoding:NSASCIIStringEncoding]]
cachePolicy:NSURLRequestUseProtocolCachePolicy timeoutInterval:60.0];
NSURLConnection *connection = [[NSURLConnection alloc]
initWithRequest:request delegate:self];
if (connection)
{
receivedData = [[NSMutableData data] retain];
}
else
{
NSLog(@"can't connect to server");
}
while (keepRunningThread)
{
[[NSRunLoop currentRunLoop] runMode:NSDefaultRunLoopMode
beforeDate:nil];
// if we've been told to stop, stop ...
if (keepRunningThread == 0)
{
[connection cancel];
AudioQueueStop(myData.audioQueue, false);
AudioFileStreamClose(myData.audioFileStream);
AudioQueueDispose(myData.audioQueue, false);
}
}
myData.playing = NO;
pthread_cond_destroy(&myData.cond);
pthread_mutex_destroy(&myData.mutex);
[pool release];
exit;
}
Regards,
John
Falling You - exploring the beauty of voice and sound
http://www.fallingyou.com
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