在我的应用程序的一个视图中,有一个按钮。按下时,它应该开始拍摄视频,触发声音文件以启动,并在取消隐藏另一个按钮时将自己隐藏起来。第二个按钮应该停止视频录制并保存。这是我录制的视频录制代码,最初没有问题:
在viewDidLoad中:
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];
和按钮:
-(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];
最后,在最后一个按钮下:
[movieFileOutput stopRecording];
这是保存视频的代码:
- (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)
{
}
}];
}
}
}
所有这一切都很好。然后我添加了几行,以便在按下开始按钮时播放歌曲文件。
在viewDidLoad中:
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];
并在开始按钮下:
if (player == nil)
NSLog(@"Audio file could not be played");
else
[player play];
现在,当按下开始按钮时,歌曲播放没有任何问题,但视频捕捉混乱了。在添加AVAudioPlayer的东西之前,当我按下完成按钮时,我会得到“didFinishRecordingToOutputFileAtURL - enter”和“didFinishRecordingToOutputFileAtURL - success”日志,现在当我按下开始按钮时我得到第一个日志,当我按下按钮时没有任何反应完成按钮,不记录任何视频。如果我注释掉播放歌曲的行,那么视频捕捉再次正常工作。有什么想法在这里发生了什么?
答案 0 :(得分:2)
- (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];
}
注意:添加框架:AudioToolbox.framework。
#import <AudioToolbox/AudioServices.h>