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मैंने "AVFoundation" का उपयोग कर एक वीडियो ऐप बनाने की कोशिश की है। अब मैं AVCaptureVideoDataOutput के माध्यम से वीडियो को सहेज सकता हूं और खेल सकता हूं। लेकिन किसी भी तरह ऑडियो काम नहीं करता है और मुझे नहीं पता कि क्यों। मैं आईओएस ऐप के शुरुआती हूं इसलिए यह समझाने के लिए स्पष्ट नहीं हो सकता है। आशा है कि आप समझें कि मैं क्या कहने की कोशिश कर रहा हूं और मुझे कुछ सुझाव दे रहा हूं।AVCaptureVideoDataOutput और AVCaptureAudioDataOutput का उपयोग करके वीडियो और ऑडियो को एक साथ कैसे लिखना है?
यह वह कोड है जिसका मैं उपयोग कर रहा हूं।
AVCaptureVideoDataOutput और AVCaptureAudioDataOutput की स्थापना:
AVCaptureVideoDataOutput* videoDataOutput = [[AVCaptureVideoDataOutput alloc] init];
[CaptureSession addOutput:videoDataOutput];
videoDataOutput.videoSettings = [NSDictionary dictionaryWithObjectsAndKeys:
[NSNumber numberWithInt:kCVPixelFormatType_32BGRA],kCVPixelBufferPixelFormatTypeKey,
nil];
dispatch_queue_t videoQueue = dispatch_queue_create("VideoQueue", NULL);
[videoDataOutput setSampleBufferDelegate:self queue:videoQueue];
AVCaptureAudioDataOutput *audioDataOutput = [[AVCaptureAudioDataOutput alloc] init];
[CaptureSession addOutput:audioDataOutput];
dispatch_queue_t audioQueue = dispatch_queue_create("AudioQueue", NULL);
[audioDataOutput setSampleBufferDelegate:self queue:audioQueue];
AVAssetWrite और AVAssetWriterInput की स्थापना:
- (void)makeWriter{
pathString = [NSHomeDirectory()stringByAppendingPathComponent:@"Documents/capture.mov"];
exportURL = [NSURL fileURLWithPath:pathString];
if ([[NSFileManager defaultManager] fileExistsAtPath:exportURL.path])
{
[[NSFileManager defaultManager] removeItemAtPath:exportURL.path error:nil];
}
NSError* error;
writer = [[AVAssetWriter alloc] initWithURL:exportURL
fileType:AVFileTypeQuickTimeMovie
error:&error];
NSDictionary* videoSetting = [NSDictionary dictionaryWithObjectsAndKeys:
AVVideoCodecH264, AVVideoCodecKey,
[NSNumber numberWithInt:1280], AVVideoWidthKey,
[NSNumber numberWithInt:720], AVVideoHeightKey,
nil];
videoWriterInput = [AVAssetWriterInput assetWriterInputWithMediaType:AVMediaTypeVideo
outputSettings:videoSetting];
videoWriterInput.expectsMediaDataInRealTime = YES;
// Add the audio input
AudioChannelLayout acl;
bzero(&acl, sizeof(acl));
acl.mChannelLayoutTag = kAudioChannelLayoutTag_Mono;
NSDictionary* audioOutputSettings = nil;
// Both type of audio inputs causes output video file to be corrupted.
if(NO) {
// should work from iphone 3GS on and from ipod 3rd generation
audioOutputSettings = [NSDictionary dictionaryWithObjectsAndKeys:
[ NSNumber numberWithInt: kAudioFormatMPEG4AAC ], AVFormatIDKey,
[ NSNumber numberWithInt: 1 ], AVNumberOfChannelsKey,
[ NSNumber numberWithFloat: 44100.0 ], AVSampleRateKey,
[ NSNumber numberWithInt: 64000 ], AVEncoderBitRateKey,
[ NSData dataWithBytes: &acl length: sizeof(acl) ], AVChannelLayoutKey,
nil];
} else {
// should work on any device requires more space
audioOutputSettings = [ NSDictionary dictionaryWithObjectsAndKeys:
[ NSNumber numberWithInt: kAudioFormatAppleLossless ], AVFormatIDKey,
[ NSNumber numberWithInt: 16 ], AVEncoderBitDepthHintKey,
[ NSNumber numberWithFloat: 44100.0 ], AVSampleRateKey,
[ NSNumber numberWithInt: 1 ], AVNumberOfChannelsKey,
[ NSData dataWithBytes: &acl length: sizeof(acl) ], AVChannelLayoutKey,
nil ];
}
audioWriterInput = [AVAssetWriterInput
assetWriterInputWithMediaType: AVMediaTypeAudio
outputSettings: audioOutputSettings ];
audioWriterInput.expectsMediaDataInRealTime = YES;
// add input
[writer addInput:videoWriterInput];
[writer addInput:audioWriterInput];
}
और अंत में CaptureOutput कोड:
- (void)captureOutput:(AVCaptureOutput *)captureOutput didOutputSampleBuffer:(CMSampleBufferRef)sampleBuffer fromConnection:(AVCaptureConnection *)connection{
if ((isPause) && (isRecording)) { return; }
if(!CMSampleBufferDataIsReady(sampleBuffer)){return;}
if(isRecording == YES) {
isWritting = YES;
if(writer.status != AVAssetWriterStatusWriting ) {
[writer startWriting];
[writer startSessionAtSourceTime:kCMTimeZero];
}
if([videoWriterInput isReadyForMoreMediaData]) {
CFRetain(sampleBuffer);
CMSampleBufferRef newSampleBuffer = [self offsetTimmingWithSampleBufferForVideo:sampleBuffer];
[videoWriterInput appendSampleBuffer:newSampleBuffer];
CFRelease(sampleBuffer);
CFRelease(newSampleBuffer);
}
writeFrames++;
}
}
- (CMSampleBufferRef)offsetTimmingWithSampleBufferForVideo:(CMSampleBufferRef)sampleBuffer
{
CMSampleBufferRef newSampleBuffer;
CMSampleTimingInfo sampleTimingInfo;
sampleTimingInfo.duration = CMTimeMake(1, 30);
sampleTimingInfo.presentationTimeStamp = CMTimeMake(writeFrames, 30);
sampleTimingInfo.decodeTimeStamp = kCMTimeInvalid;
CMSampleBufferCreateCopyWithNewTiming(kCFAllocatorDefault,
sampleBuffer,
1,
&sampleTimingInfo,
&newSampleBuffer);
return newSampleBuffer;
}
आपकी सलाह के लिए बहुत बहुत धन्यवाद। मैं इसे आज़माउंगा! – junn511