AVAudioPlayer breaking video capture - objective-c

Question

In one of the views of my app there's a button. When pressed it is supposed to begin taking a video, trigger a sound file to start, and hide itself from view while unhiding another button. The second button is supposed to stop the video recording and make it save. Here's the code I have for the video recording, which initially worked with no problems:
in viewDidLoad:
finishButton.hidden = TRUE;
session = [[AVCaptureSession alloc] init];
movieFileOutput = [[AVCaptureMovieFileOutput alloc] init];
NSError *error;
AVCaptureDeviceInput *videoInput = [[AVCaptureDeviceInput alloc] initWithDevice:[self cameraWithPosition:AVCaptureDevicePositionFront] error:&error];
if (videoInput)
{
[session addInput:videoInput];
}
AVCaptureDevice *audioCaptureDevice = [AVCaptureDevice defaultDeviceWithMediaType:AVMediaTypeAudio];
NSError *audioError = nil;
AVCaptureDeviceInput *audioInput = [AVCaptureDeviceInput deviceInputWithDevice:audioCaptureDevice error:&audioError];
if (audioInput)
{
[session addInput:audioInput];
}
Float64 TotalSeconds = 35; //Total seconds
int32_t preferredTimeScale = 30; //Frames per second
CMTime maxDuration = CMTimeMakeWithSeconds(TotalSeconds, preferredTimeScale);
movieFileOutput.maxRecordedDuration = maxDuration;
movieFileOutput.minFreeDiskSpaceLimit = 1024 * 1024;
if ([session canAddOutput:movieFileOutput])
[session addOutput:movieFileOutput];
[session setSessionPreset:AVCaptureSessionPresetMedium];
if ([session canSetSessionPreset:AVCaptureSessionPreset640x480]) //Check size based configs are supported before setting them
[session setSessionPreset:AVCaptureSessionPreset640x480];
[self cameraSetOutputProperties];
[session startRunning];
and for the button:
-(IBAction)start:(id)sender
{
startButton.hidden = TRUE;
finishButton.hidden = FALSE;
//Create temporary URL to record to
NSString *outputPath = [[NSString alloc] initWithFormat:#"%#%#", NSTemporaryDirectory(), #"output.mov"];
self.outputURL = [[NSURL alloc] initFileURLWithPath:outputPath];
NSFileManager *fileManager = [NSFileManager defaultManager];
if ([fileManager fileExistsAtPath:outputPath])
{
NSError *error;
if ([fileManager removeItemAtPath:outputPath error:&error] == NO)
{
//Error - handle if required
}
}
//Start recording
[movieFileOutput startRecordingToOutputFileURL:outputURL recordingDelegate:self];
finally, under the last button:
[movieFileOutput stopRecording];
and here's the code to save the video:
- (void)captureOutput:(AVCaptureFileOutput *)captureOutput
didFinishRecordingToOutputFileAtURL:(NSURL *)outputFileURL
fromConnections:(NSArray *)connections
error:(NSError *)error
{
NSLog(#"didFinishRecordingToOutputFileAtURL - enter");
BOOL RecordedSuccessfully = YES;
if ([error code] != noErr)
{
// A problem occurred: Find out if the recording was successful.
id value = [[error userInfo] objectForKey:AVErrorRecordingSuccessfullyFinishedKey];
if (value)
{
RecordedSuccessfully = [value boolValue];
}
}
if (RecordedSuccessfully)
{
//----- RECORDED SUCESSFULLY -----
NSLog(#"didFinishRecordingToOutputFileAtURL - success");
ALAssetsLibrary *library = [[ALAssetsLibrary alloc] init];
if ([library videoAtPathIsCompatibleWithSavedPhotosAlbum:outputURL])
{
[library writeVideoAtPathToSavedPhotosAlbum:outputURL
completionBlock:^(NSURL *assetURL, NSError *error)
{
if (error)
{
}
}];
}
}
}
All of this was working just fine. Then I added a few lines so that a song file would play when the start button was pressed.
in viewDidLoad:
NSURL *url = [NSURL fileURLWithPath:[NSString stringWithFormat:#"%#/Song.aiff", [[NSBundle mainBundle] resourcePath]]];
NSError *audioFileError;
player = [[AVAudioPlayer alloc] initWithContentsOfURL:url error:&audioFileError];
player.numberOfLoops = 0;
[self.player prepareToPlay];
and under the start button:
if (player == nil)
NSLog(#"Audio file could not be played");
else
[player play];
Now when the start button is pressed the song plays with no problems, but the video capture is messed up. Before adding the AVAudioPlayer stuff I would get the "didFinishRecordingToOutputFileAtURL - enter" and "didFinishRecordingToOutputFileAtURL - success" logs when I pressed the finish button, and now I get the first log as soon as I press the start button, nothing happens when I press the finish button, and no video is recorded. If I comment out the lines that make the song play then the video capture works just fine again. Any ideas what's going on here?

Answer 1

- (void)setupAudioSession
{
static BOOL audioSessionSetup = NO;
if (audioSessionSetup)
{
return;
}
[[AVAudioSession sharedInstance] setCategory:AVAudioSessionCategoryPlayback error: nil];
UInt32 doSetProperty = 1;
AudioSessionSetProperty (kAudioSessionProperty_OverrideCategoryMixWithOthers, sizeof(doSetProperty), &doSetProperty);
[[AVAudioSession sharedInstance] setActive: YES error: nil];
audioSessionSetup = YES;
}
- (void)playAudio
{
[self setupAudioSession];
NSString *soundFilePath = [[NSBundle mainBundle] pathForResource:#"btnClick" ofType:#"wav"];
NSURL *fileURL = [[NSURL alloc] initFileURLWithPath:soundFilePath];
AVAudioPlayer *newPlayer = [[AVAudioPlayer alloc] initWithContentsOfURL:fileURL error:nil];
[fileURL release];
self.audioPlayer = newPlayer;
[newPlayer release];
[audioPlayer setDelegate:self];
[audioPlayer prepareToPlay];
audioPlayer.volume=1.0;
[audioPlayer play];
}
NOTE: Add the framework: AudioToolbox.framework.
#import <AudioToolbox/AudioServices.h>