よくある動画アプリのあれを実装したい。

Instagram, Vine, SlideStory のような動画アプリで動画を保存する仕込みが気になったので実装しました。

Transcript

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    AVCaptureVideoDataOutputSampleBufferDelegate
    AVCaptureAudioDataOutputSampleBufferDelegate
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15. #pragma mark - AVCaptureVideoDataOutputSampleBufferDelegate, AVCaptureAudioDataOutputSampleBufferDelegate
    !
    - (void)captureOutput:(AVCaptureOutput *)captureOutput didOutputSampleBuffer:(CMSampleBufferRef)sampleBuffer
    fromConnection:(AVCaptureConnection *)connection
    {
    !
    if (!CMSampleBufferDataIsReady(sampleBuffer)) {
    NSLog(@"sampleBuffer data is not ready");
    }
    !
    CMTime currentTime = CMSampleBufferGetPresentationTimeStamp(sampleBuffer);
    !
    if (self.touching) {
    !
    // Video
    if ([captureOutput isKindOfClass:[AVCaptureVideoDataOutput class]]) {
    [self addSamplebuffer:sampleBuffer withWriterInput:(AVAssetWriterInput *)self.assetWriterInputVideo];
    }
    // Audio
    else if ([captureOutput isKindOfClass:[AVCaptureAudioDataOutput class]]) {
    [self addSamplebuffer:sampleBuffer withWriterInput:(AVAssetWriterInput *)self.assetWriterInputAudio];
    }
    !
    }
    !
    self.recordStartTime = currentTime;
    }
    AVCaptureVideoDataOutputSampleBufferDelegate
    AVCaptureAudioDataOutputSampleBufferDelegate
    

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    - (void)touchesBegan:(NSSet *)touches withEvent:(UIEvent *)event;
    - (void)touchesEnded:(NSSet *)touches withEvent:(UIEvent *)event;
    

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    // AVAssetWriter
    self.assetWriter = [AVAssetWriter assetWriterWithURL:self.outputURL
    fileType:AVFileTypeQuickTimeMovie
    error:&error];
    !
    !
    // movie
    NSDictionary *videoSetting = self.videoSettings;
    self.assetWriterInputVideo = [AVAssetWriterInput assetWriterInputWithMediaType:AVMediaTypeVideo
    outputSettings:videoSetting];
    [self.assetWriterInputVideo setExpectsMediaDataInRealTime:YES];
    !
    !
    // audio
    NSDictionary *audioSetting = self.audioSettings;
    self.assetWriterInputAudio = [AVAssetWriterInput assetWriterInputWithMediaType:AVMediaTypeAudio
    outputSettings:audioSetting];
    [self.assetWriterInputAudio setExpectsMediaDataInRealTime:YES];
    !
    !
    [self.assetWriter addInput:self.assetWriterInputVideo];
    [self.assetWriter addInput:self.assetWriterInputAudio];
    !
    // queue
    self.movieWritingQueue = dispatch_queue_create("Movie Writing Queue", DISPATCH_QUEUE_SERIAL);
    !
    // Record
    [self.assetWriter startWriting];
    [self.assetWriter startSessionAtSourceTime:self.recordStartTime];
    
    

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22. 4UBSU8SJUJOH
    // AVAssetWriter
    self.assetWriter = [AVAssetWriter assetWriterWithURL:self.outputURL
    fileType:AVFileTypeQuickTimeMovie
    error:&error];
    !
    !
    // movie
    NSDictionary *videoSetting = self.videoSettings;
    self.assetWriterInputVideo = [AVAssetWriterInput assetWriterInputWithMediaType:AVMediaTypeVideo
    outputSettings:videoSetting];
    [self.assetWriterInputVideo setExpectsMediaDataInRealTime:YES];
    !
    !
    // audio
    NSDictionary *audioSetting = self.audioSettings;
    self.assetWriterInputAudio = [AVAssetWriterInput assetWriterInputWithMediaType:AVMediaTypeAudio
    outputSettings:audioSetting];
    [self.assetWriterInputAudio setExpectsMediaDataInRealTime:YES];
    !
    !
    [self.assetWriter addInput:self.assetWriterInputVideo];
    [self.assetWriter addInput:self.assetWriterInputAudio];
    !
    // queue
    self.movieWritingQueue = dispatch_queue_create("Movie Writing Queue", DISPATCH_QUEUE_SERIAL);
    !
    // Record
    [self.assetWriter startWriting];
    [self.assetWriter startSessionAtSourceTime:self.recordStartTime];
    
    

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    // AVAssetWriter
    self.assetWriter = [AVAssetWriter assetWriterWithURL:self.outputURL
    fileType:AVFileTypeQuickTimeMovie
    error:&error];
    !
    !
    // movie
    NSDictionary *videoSetting = self.videoSettings;
    self.assetWriterInputVideo = [AVAssetWriterInput assetWriterInputWithMediaType:AVMediaTypeVideo
    outputSettings:videoSetting];
    [self.assetWriterInputVideo setExpectsMediaDataInRealTime:YES];
    !
    !
    // audio
    NSDictionary *audioSetting = self.audioSettings;
    self.assetWriterInputAudio = [AVAssetWriterInput assetWriterInputWithMediaType:AVMediaTypeAudio
    outputSettings:audioSetting];
    [self.assetWriterInputAudio setExpectsMediaDataInRealTime:YES];
    !
    !
    [self.assetWriter addInput:self.assetWriterInputVideo];
    [self.assetWriter addInput:self.assetWriterInputAudio];
    !
    // queue
    self.movieWritingQueue = dispatch_queue_create("Movie Writing Queue", DISPATCH_QUEUE_SERIAL);
    !
    // Record
    [self.assetWriter startWriting];
    [self.assetWriter startSessionAtSourceTime:self.recordStartTime];
    
    

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24. 4UBSU8SJUJOH
    // AVAssetWriter
    self.assetWriter = [AVAssetWriter assetWriterWithURL:self.outputURL
    fileType:AVFileTypeQuickTimeMovie
    error:&error];
    !
    !
    // movie
    NSDictionary *videoSetting = self.videoSettings;
    self.assetWriterInputVideo = [AVAssetWriterInput assetWriterInputWithMediaType:AVMediaTypeVideo
    outputSettings:videoSetting];
    [self.assetWriterInputVideo setExpectsMediaDataInRealTime:YES];
    !
    !
    // audio
    NSDictionary *audioSetting = self.audioSettings;
    self.assetWriterInputAudio = [AVAssetWriterInput assetWriterInputWithMediaType:AVMediaTypeAudio
    outputSettings:audioSetting];
    [self.assetWriterInputAudio setExpectsMediaDataInRealTime:YES];
    !
    !
    [self.assetWriter addInput:self.assetWriterInputVideo];
    [self.assetWriter addInput:self.assetWriterInputAudio];
    !
    // queue
    self.movieWritingQueue = dispatch_queue_create("Movie Writing Queue", DISPATCH_QUEUE_SERIAL);
    !
    // Record
    [self.assetWriter startWriting];
    [self.assetWriter startSessionAtSourceTime:self.recordStartTime];
    
    

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25. 4UBSU8SJUJOH
    // AVAssetWriter
    self.assetWriter = [AVAssetWriter assetWriterWithURL:self.outputURL
    fileType:AVFileTypeQuickTimeMovie
    error:&error];
    !
    !
    // movie
    NSDictionary *videoSetting = self.videoSettings;
    self.assetWriterInputVideo = [AVAssetWriterInput assetWriterInputWithMediaType:AVMediaTypeVideo
    outputSettings:videoSetting];
    [self.assetWriterInputVideo setExpectsMediaDataInRealTime:YES];
    !
    !
    // audio
    NSDictionary *audioSetting = self.audioSettings;
    self.assetWriterInputAudio = [AVAssetWriterInput assetWriterInputWithMediaType:AVMediaTypeAudio
    outputSettings:audioSetting];
    [self.assetWriterInputAudio setExpectsMediaDataInRealTime:YES];
    !
    !
    [self.assetWriter addInput:self.assetWriterInputVideo];
    [self.assetWriter addInput:self.assetWriterInputAudio];
    !
    // queue
    self.movieWritingQueue = dispatch_queue_create("Movie Writing Queue", DISPATCH_QUEUE_SERIAL);
    !
    // Record
    [self.assetWriter startWriting];
    [self.assetWriter startSessionAtSourceTime:self.recordStartTime];
    
    

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26. 4UBSU8SJUJOH
    - (void)addSamplebuffer:(CMSampleBufferRef)sampleBuffer withWriterInput:(AVAssetWriterInput
    *)assetWriterInput
    {
    CMFormatDescriptionRef formatDescription = CMSampleBufferGetFormatDescription(sampleBuffer);
    !
    CFRetain(sampleBuffer);
    CFRetain(formatDescription);
    dispatch_async(self.movieWritingQueue, ^{
    !
    if (_assetWriter.status == AVAssetWriterStatusWriting) {
    !
    if (assetWriterInput.readyForMoreMediaData) {
    !
    [assetWriterInput appendSampleBuffer:sampleBuffer];
    !
    }
    }
    !
    CFRelease(sampleBuffer);
    CFRelease(formatDescription);
    });
    }
    

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    [self.assetWriterInputVideo markAsFinished];
    [self.assetWriterInputAudio markAsFinished];
    [self.assetWriter endSessionAtSourceTime:self.recordStartTime];
    [self.assetWriter finishWritingWithCompletionHandler:^{
    NSLog(@"self.assetWriter finishWritingWithCompletionHandler");
    [self.movieURLs addObject:self.outputURL];
    NSLog(@"%@", self.movieURLs);
    }];
    

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31. 'JOJTI8SJUJOH
    [self.assetWriterInputVideo markAsFinished];
    [self.assetWriterInputAudio markAsFinished];
    [self.assetWriter endSessionAtSourceTime:self.recordStartTime];
    [self.assetWriter finishWritingWithCompletionHandler:^{
    NSLog(@"self.assetWriter finishWritingWithCompletionHandler");
    [self.movieURLs addObject:self.outputURL];
    NSLog(@"%@", self.movieURLs);
    }];
    

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