我使用AVfoudnation录制了音频/视频。在开始捕捉视频/音频之前,我需要使用系统声音播放声音。这是第一次正常工作,但当我第二次尝试时,系统奥迪不玩。我的猜测是AVfoundation中的某些内容没有正确发布。捕捉音频/视频后无法播放系统声音
在我的应用程序deletage,我有这样的代码中的applicationDidFinishLaunching方法:
VKRSAppSoundPlayer *aPlayer = [[VKRSAppSoundPlayer alloc] init];
[aPlayer addSoundWithFilename:@"sound1" andExtension:@"caf"];
self.appSoundPlayer = aPlayer;
[aPlayer release];
而且这种方法
- (void)playSound:(NSString *)sound
{
[appSoundPlayer playSound:sound];
}
正如你可以看到我使用VKRSAppSoundPlayer,它的伟大工程!
在视图中,我有这样的代码:
- (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];
}
如果我[videoInput释放];和[audioInput发布];我收到了错误的访问错误。这就是为什么他们被评论。这可能是问题的一部分。
如果我尝试播放系统声音n次,它会奏效,但是如果我先录制脚本,那么在此之后就不会起作用。
任何想法?
你需要更好地理解self.iVar意味着什么,以及什么意味着什么。释放递减保留计数,如果0使对象有资格取消分配。使用self.iVar(假设你已经声明它是一个属性)保留了这个iVar,所以你可以在那之后发布它。但我不认为这是你的音频问题。 – Rayfleck 2011-12-15 17:50:30