Can't play system sounds after capturing audio / video - objective-c

Question

I'm recoding audio/video using AVfoudnation. and I need to play a sounds, using system sounds, before I start capturing video/audio. This is working correctly the first time, but when I try to do it the second time, the system audi doesn't play. My guess is that something in the AVfoundation is not been released correctly.
In my application deletage, I have this code in the applicationDidFinishLaunching method:
VKRSAppSoundPlayer *aPlayer = [[VKRSAppSoundPlayer alloc] init];
[aPlayer addSoundWithFilename:#"sound1" andExtension:#"caf"];
self.appSoundPlayer = aPlayer;
[aPlayer release];
and also this method
- (void)playSound:(NSString *)sound
{
[appSoundPlayer playSound:sound];
}
As you can see I'm using VKRSAppSoundPlayer, which works great!
In a view, I have this code:
- (void) startSession
{
self.session = [[AVCaptureSession alloc] init];
[session beginConfiguration];
if([session canSetSessionPreset:AVCaptureSessionPreset640x480])
session.sessionPreset = AVCaptureSessionPresetMedium;
[session commitConfiguration];
CALayer *viewLayer = [videoPreviewView layer];
AVCaptureVideoPreviewLayer *captureVideoPreviewLayer = [[AVCaptureVideoPreviewLayer alloc] initWithSession:session];
captureVideoPreviewLayer.frame = viewLayer.bounds;
[viewLayer addSublayer:captureVideoPreviewLayer];
self.videoInput = [AVCaptureDeviceInput deviceInputWithDevice:[self frontFacingCameraIfAvailable] error:nil];
self.audioInput = [AVCaptureDeviceInput deviceInputWithDevice:[self audioDevice] error:nil];
if(videoInput){
self.videoOutput = [[AVCaptureMovieFileOutput alloc] init];
[session addOutput:videoOutput];
//[videoOutput release];
if([session canAddInput:videoInput]){
//[session beginConfiguration];
[session addInput:videoInput];
}
//[videoInput release];
[session removeInput:[self audioInput]];
if([session canAddInput:audioInput]){
[session addInput:audioInput];
}
//[audioInput release];
if([session canAddInput:audioInput])
[session addInput:audioInput];
NSLog(#"startRunning!");
[session startRunning];
[self startRecording];
if(![self recordsVideo])
[self showAlertWithTitle:#"Video Recording Unavailable" msg:#"This device can't record video."];
}
}
- (void) stopSession
{
[session stopRunning];
[session release];
}
- (AVCaptureDevice *)frontFacingCameraIfAvailable
{
NSArray *videoDevices = [AVCaptureDevice devicesWithMediaType:AVMediaTypeVideo];
AVCaptureDevice *captureDevice = nil;
Boolean cameraFound = false;
for (AVCaptureDevice *device in videoDevices)
{
NSLog(#"1 frontFacingCameraIfAvailable %d", device.position);
if (device.position == AVCaptureDevicePositionBack){
NSLog(#"1 frontFacingCameraIfAvailable FOUND");
captureDevice = device;
cameraFound = true;
break;
}
}
if(cameraFound == false){
for (AVCaptureDevice *device in videoDevices)
{
NSLog(#"2 frontFacingCameraIfAvailable %d", device.position);
if (device.position == AVCaptureDevicePositionFront){
NSLog(#"2 frontFacingCameraIfAvailable FOUND");
captureDevice = device;
break;
}
}
}
return captureDevice;
}
- (AVCaptureDevice *) audioDevice
{
NSArray *devices = [AVCaptureDevice devicesWithMediaType:AVMediaTypeAudio];
if ([devices count] > 0) {
return [devices objectAtIndex:0];
}
return nil;
}
- (void) startRecording
{
#if _Multitasking_
if ([[UIDevice currentDevice] isMultitaskingSupported]) {
[self setBackgroundRecordingID:[[UIApplication sharedApplication] beginBackgroundTaskWithExpirationHandler:^{}]];
}
#endif
[videoOutput startRecordingToOutputFileURL:[self generatenewVideoPath]
recordingDelegate:self];
}
- (void) stopRecording
{
[videoOutput stopRecording];
}
- (void)captureOutput:(AVCaptureFileOutput *)captureOutput
didFinishRecordingToOutputFileAtURL:(NSURL *)outputFileURL
fromConnections:(NSArray *)connections error:(NSError *)error
{
NSFileManager *man = [[NSFileManager alloc] init];
NSDictionary *attrs = [man attributesOfItemAtPath: [outputFileURL path] error: NULL];
NSString *fileSize = [NSString stringWithFormat:#"%llu", [attrs fileSize]];
// close this screen
[self exitScreen];
}
-(BOOL)recordsVideo
{
AVCaptureConnection *videoConnection = [AVCamUtilities connectionWithMediaType:AVMediaTypeVideo
fromConnections:[videoOutput connections]];
return [videoConnection isActive];
}
-(BOOL)recordsAudio
{
AVCaptureConnection *audioConnection = [AVCamUtilities connectionWithMediaType:AVMediaTypeAudio
fromConnections:[videoOutput connections]];
return [audioConnection isActive];
}
If I do [videoInput release]; and [audioInput release]; I got a bad access error. that's why they are commented out. This may be part of the issue.
If I try to play the system sound n times, it work, but if I go first to the recording script, it wont work after that.
Any ideas?

Answer 1

The proper way to release AVCaptureSession is the following:
- (void) destroySession {
// Notify the view that the session will end
if ([delegate respondsToSelector:#selector(captureManagerSessionWillEnd:)]) {
[delegate captureManagerSessionWillEnd:self];
}
// remove the device inputs
[session removeInput:[self videoInput]];
[session removeInput:[self audioInput]];
// release
[session release];
// remove AVCamRecorder
[recorder release];
// Notify the view that the session has ended
if ([delegate respondsToSelector:#selector(captureManagerSessionEnded:)]) {
[delegate captureManagerSessionEnded:self];
}
}
If you're having some sort of release problems (bad access), I can recommend taking your code out of your current "messy" project to some other new project and debug the problem over there.
When I had similar problem, I just did that. I shared it on Github, you might find this project useful: AVCam-CameraReleaseTest