我正在尝试借助我从 iPhone 开发人员程序获得的 WWDC 示例，使用 AVFoundation 框架从 iPhone 4 的前置摄像头录制视频。但我仍然无法让它工作..视频没有被录制或可能保存在我的 iPhone 库中......这是我正在尝试使用的代码......如果有人能帮助我解决这个问题，那将非常有帮助我有？？
-(void)recordVideo
{
AVCaptureDeviceInput *videoInput = [[AVCaptureDeviceInput alloc] initWithDevice:[self backFacingCamera] error:nil];
AVCaptureMovieFileOutput *movieFileOutput = [[AVCaptureMovieFileOutput alloc] init];
AVCaptureSession *session = [[AVCaptureSession alloc] init];
[session addInput:videoInput];
[session addOutput:movieFileOutput];
[movieFileOutput release];
if (![session isRunning])
{
[self performSelector:@selector(startRecording) withObject:nil afterDelay:1.0];
[session startRunning];
}
}
- (void) startRecording
{
NSLog(@"start recording");
AVCaptureConnection *videoConnection = [playVideo connectionWithMediaType:AVMediaTypeVideo fromConnections:[[self movieFileOutput] connections]];
if ([videoConnection isVideoOrientationSupported]) {
[videoConnection setVideoOrientation:[self orientation]];
}
[[self movieFileOutput] startRecordingToOutputFileURL:[self tempFileURL]
recordingDelegate:self];
}
- (void) stopRecording
{
NSLog(@"stop recording");
[[self movieFileOutput] stopRecording];
}
- (NSURL *) tempFileURL
{
NSLog(@"temp file url");
NSString *outputPath = [[NSString alloc] initWithFormat:@"%@%@", NSTemporaryDirectory(), @"output.mov"];
NSURL *outputURL = [[NSURL alloc] initFileURLWithPath:outputPath];
NSFileManager *fileManager = [NSFileManager defaultManager];
if ([fileManager fileExistsAtPath:outputPath]) {
NSLog(@"exists");
}
[outputPath release];
return [outputURL autorelease];
}
- (void) setConnectionWithMediaType:(NSString *)mediaType enabled:(BOOL)enabled;
{
[[playVideo connectionWithMediaType:AVMediaTypeVideo fromConnections:[[self movieFileOutput] connections]] setEnabled:enabled];
}
+ (AVCaptureConnection *)connectionWithMediaType:(NSString *)mediaType fromConnections:(NSArray *)connections;
{
NSLog(@"connection with media type");
for ( AVCaptureConnection *connection in connections ) {
for ( AVCaptureInputPort *port in [connection inputPorts] ) {
if ( [[port mediaType] isEqual:mediaType] ) {
return [[connection retain] autorelease];
}
}
}
return nil;
}
@implementation recordVideo (Internal)
- (AVCaptureDevice *) cameraWithPosition:(AVCaptureDevicePosition) position
{
NSArray *devices = [AVCaptureDevice devicesWithMediaType:AVMediaTypeVideo];
for (AVCaptureDevice *device in devices) {
if ([device position] == position) {
return device;
}
}
return nil;
}
- (AVCaptureDevice *) backFacingCamera
{
NSLog(@"back");
return [self cameraWithPosition:AVCaptureDevicePositionBack];
}
- (AVCaptureDevice *) frontFacingCamera
{
NSLog(@"front ");
return [self cameraWithPosition:AVCaptureDevicePositionFront];
}
@end
@implementation recordVideo (AVCaptureFileOutputRecordingDelegate)
- (void) captureOutput:(AVCaptureFileOutput *)captureOutput
didStartRecordingToOutputFileAtURL:(NSURL *)fileURL
fromConnections:(NSArray *)connections
{
NSLog(@"did start recording");
}
- (void) captureOutput:(AVCaptureFileOutput *)captureOutput
didFinishRecordingToOutputFileAtURL:(NSURL *)outputFileURL
fromConnections:(NSArray *)connections
error:(NSError *)error
{
NSLog(@"did finish recording output file");
ALAssetsLibrary *library = [[ALAssetsLibrary alloc] init];
if ([library videoAtPathIsCompatibleWithSavedPhotosAlbum:outputFileURL])
{
[library writeVideoAtPathToSavedPhotosAlbum:outputFileURL
completionBlock:^(NSURL *assetURL, NSError *error){
if (error && [delegate respondsToSelector:@selector(assetLibraryError:forURL:)]) {
[delegate assetLibraryError:error forURL:assetURL];
}
}];
}
else {
}
[library release];
}
@end