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POHow can I save the data re-encoded using AVWriterInput int the memory?
 

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  1. POHow can I save the data re-encoded using AVWriterInput int the memory?
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    <pre><code>- (void)setUpSession{ m_session = [[AVCaptureSession alloc] init]; m_session.sessionPreset = AVCaptureSessionPresetLow; // video Input NSError *error = NULL; AVCaptureDevice *videoDevice = [AVCaptureDevice defaultDeviceWithMediaType:AVMediaTypeVideo]; if (videoDevice != NULL) { AVCaptureDeviceInput *videoInput = [AVCaptureDeviceInput deviceInputWithDevice:videoDevice error:&amp;error]; if (videoInput != NULL) { if ([m_session canAddInput:videoInput]) { [m_session addInput:videoInput]; } } else { // NSLog(@"%@", [error localizedFailureReason]); } } // audio input if (![videoDevice hasMediaType:AVMediaTypeAudio] &amp;&amp; ![videoDevice hasMediaType:AVMediaTypeMuxed]) { AVCaptureDevice *audioDevice = [AVCaptureDevice defaultDeviceWithMediaType:AVMediaTypeAudio]; if (audioDevice != nil) { AVCaptureDeviceInput *audioInput = [AVCaptureDeviceInput deviceInputWithDevice:audioDevice error:&amp;error]; if (audioDevice != nil) { if ([m_session canAddInput:audioInput]) { [m_session addInput:audioInput]; } } else { // NSLog(@"%@", [error localizedFailureReason]); } } } else { NSLog(@"videoDevice has audioMedia or muxed"); } // video Output m_videoOut = [[AVCaptureVideoDataOutput alloc] init]; m_videoOut.alwaysDiscardsLateVideoFrames = NO; m_videoOut.videoSettings = [NSDictionary dictionaryWithObject: [NSNumber numberWithInt:kCVPixelFormatType_420YpCbCr8BiPlanarVideoRange] forKey:(id)kCVPixelBufferPixelFormatTypeKey]; //kCVPixelFormatType_420YpCbCr8BiPlanarVideoRange if ([m_session canAddOutput:m_videoOut]) { [m_session addOutput:m_videoOut]; } AVCaptureVideoPreviewLayer *layer = [[AVCaptureVideoPreviewLayer alloc] initWithSession:m_session]; layer.frame = m_videoView.frame; layer.videoGravity = AVLayerVideoGravityResize; [m_videoView.layer addSublayer:layer]; // audio output m_audioOut = [[AVCaptureAudioDataOutput alloc] init]; if ([m_session canAddOutput:m_audioOut]) { [m_session addOutput:m_audioOut]; } // Setup the queue dispatch_queue_t queue = dispatch_queue_create("MyQueue", NULL); [m_videoOut setSampleBufferDelegate:self queue:queue]; [m_audioOut setSampleBufferDelegate:self queue:queue]; dispatch_release(queue); } - (void)setUpWriter{ NSError *error = nil; NSURL *url = [self recordFilePath]; m_writer = [[AVAssetWriter alloc] initWithURL:url fileType:AVFileTypeQuickTimeMovie error:&amp;error]; NSParameterAssert(m_writer); // Add video input NSDictionary *videoSettings = [NSDictionary dictionaryWithObjectsAndKeys: AVVideoCodecH264, AVVideoCodecKey, [NSNumber numberWithInt:640], AVVideoWidthKey, [NSNumber numberWithInt:480], AVVideoHeightKey, nil]; m_videoWriteInput = [[AVAssetWriterInput assetWriterInputWithMediaType:AVMediaTypeVideo outputSettings:videoSettings] retain]; NSParameterAssert(m_videoWriteInput); m_videoWriteInput.expectsMediaDataInRealTime = YES; // Add the audio input AudioChannelLayout acl; bzero( &amp;acl, sizeof(acl)); acl.mChannelLayoutTag = kAudioChannelLayoutTag_Mono; NSDictionary *audioOutputSettings = [NSDictionary dictionaryWithObjectsAndKeys: [NSNumber numberWithInt: kAudioFormatMPEG4AAC], AVFormatIDKey, [NSNumber numberWithInt: 1], AVNumberOfChannelsKey, [NSNumber numberWithFloat: 16000.0], AVSampleRateKey, [NSNumber numberWithInt: 32000], AVEncoderBitRateKey, [NSData dataWithBytes:&amp;acl length:sizeof(acl)], AVChannelLayoutKey, nil]; m_audioWriterInput = [[AVAssetWriterInput assetWriterInputWithMediaType: AVMediaTypeAudio outputSettings: audioOutputSettings] retain]; m_audioWriterInput.expectsMediaDataInRealTime = YES; // add input [m_writer addInput:m_videoWriteInput]; [m_writer addInput:m_audioWriterInput]; } - (void)captureOutput:(AVCaptureOutput *)captureOutput didOutputSampleBuffer:(CMSampleBufferRef)sampleBuffer fromConnection:(AVCaptureConnection *)connection{ if( !CMSampleBufferDataIsReady(sampleBuffer) ) { NSLog( @"sample buffer is not ready. Skipping sample" ); return; } if( m_bRecording == YES ) { CMTime lastSampleTime = CMSampleBufferGetPresentationTimeStamp(sampleBuffer); if( m_writer.status != AVAssetWriterStatusWriting ) { if (m_writer.status == AVAssetWriterStatusFailed) { NSLog(@"ERROR:%@\r\n", m_writer.error); } else { [m_writer startWriting]; [m_writer startSessionAtSourceTime:lastSampleTime]; } } if( captureOutput == m_videoOut ) { [self newVideoSample:sampleBuffer]; NSLog(@"i am video"); } else { NSParameterAssert(captureOutput == m_audioOut); [self newAudioSample:sampleBuffer]; NSLog(@"i am audio"); } } } - (void)newVideoSample:(CMSampleBufferRef)sampleBuffer{ if(m_bRecording) { if( m_writer.status &gt; AVAssetWriterStatusWriting ) { NSLog(@"Warning: writer status is %d\r\n", m_writer.status); if(m_writer.status == AVAssetWriterStatusFailed) { NSLog(@"Error: %@\r\n", m_writer.error); } return; } if (m_videoWriteInput.readyForMoreMediaData) { if(![m_videoWriteInput appendSampleBuffer:sampleBuffer]) { NSLog(@"Unable to write to video input\r\n"); } } else { NSLog(@"video input readyForMoreMediaData is NO\r\n"); } } } </code></pre> <p>AS we know, using AVWriterInput can re-encode data, then save it to local file.But if I want to save the re-encoded data to the memeory, How can I get the data?what should I do? Any suggestion?</p>
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    1. COAVWriterInput cannot encode data on memory is used just for encode data to file. Try to use x264 encoder for encode the CVSampleBuffer and use it how u want.
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