用到的FrameWork有：
MediaPlayer.framework,QuartzCore.framework,CoreVideoframework,CoreMedia.framework,AVFoundation.framework
代码如下：
- (void) testCompressionSession
{
NSArrayNSArrayarrayWithObjects:[[UIImageimageNamed:@"114.png"] CGImage],[[UIImageimageNamed:@"114.png"] CGImage],[[UIImageimageNamed:@"placeholderImage.png"] CGImage],[[UIImageimageNamed:@"dfd.png"] CGImage],[[UIImageimageNamed:@"viewbg.png"] CGImage], nil];
CGSizeCGSizeMake(480, 320);
NSStringNSHomeDirectory() stringByAppendingPathComponent:@"Documents/Movie.m4v"];
NSErrornil;
unlink([betaCompressionDirectory UTF8String]);
//----initialize compression engine
AVAssetWriterAVAssetWriteralloc] initWithURL:[NSURLfileURLWithPath:betaCompressionDirectory]
fileType:AVFileTypeQuickTimeMovie
error:&error];
NSParameterAssert(videoWriter);
if(error)
NSLog(@"error = %@", [error localizedDescription]);
NSDictionaryNSDictionarydictionaryWithObjectsAndKeys:AVVideoCodecH264, AVVideoCodecKey,
NSNumbernumberWithInt:size.width], AVVideoWidthKey,
NSNumbernumberWithInt:size.height], AVVideoHeightKey, nil];
AVAssetWriterInputAVAssetWriterInputassetWriterInputWithMediaType:AVMediaTypeVideooutputSettings:videoSettings];
NSDictionaryNSDictionarydictionaryWithObjectsAndKeys:
NSNumbernumberWithInt:kCVPixelFormatType_32ARGB], kCVPixelBufferPixelFormatTypeKey, nil];
AVAssetWriterInputPixelBufferAdaptorAVAssetWriterInputPixelBufferAdaptorassetWriterInputPixelBufferAdaptorWithAssetWriterInput:writerInput
sourcePixelBufferAttributes:sourcePixelBufferAttributesDictionary];
NSParameterAssert(writerInput);
NSParameterAssert([videoWriter canAddInput:writerInput]);
ifcanAddInput:writerInput])
NSLog(@"I can add this input");
else
NSLog(@"i can't add this input");
addInput:writerInput];
startWriting];
startSessionAtSourceTime:kCMTimeZero];
//---
// insert demo debugging code to write the same image repeated as a movie
CGImageRefUIImageimageNamed:@"114.png"] CGImage];
dispatch_queue_tdispatch_queue_create("mediaInputQueue", NULL);
int__block0;
requestMediaDataWhenReadyOnQueue:dispatchQueue usingBlock:^{
whileisReadyForMoreMediaData])
{
if(++frame >= imageArr.count40)
{
markAsFinished];
finishWriting];
break;
}
int40;
CVPixelBufferRefCVPixelBufferRef)[selfpixelBufferFromCGImage:(__bridgeCGImageRef)([imageArr objectAtIndex:idx]) size:size];
if (buffer)
{
if(![adaptor appendPixelBuffer:buffer withPresentationTime:CMTimeMake(frame, 20)])
NSLog(@"FAIL");
else
NSLog(@"Success:%d", frame);
CFRelease(buffer);
}
}
}];
NSLog(@"outside for loop");
}
- (CVPixelBufferRefCGImageRef)image size:(CGSize)size
{
NSDictionaryNSDictionarydictionaryWithObjectsAndKeys:
NSNumbernumberWithBool:YES], kCVPixelBufferCGImageCompatibilityKey,
NSNumbernumberWithBool:YES], kCVPixelBufferCGBitmapContextCompatibilityKey, nil];
CVPixelBufferRefNULL;
CVReturnCVPixelBufferCreate(kCFAllocatorDefault, size.width, size.height, kCVPixelFormatType_32ARGB, (__bridgeCFDictionaryRef) options, &pxbuffer);
// CVReturn status = CVPixelBufferPoolCreatePixelBuffer(NULL, adaptor.pixelBufferPool, &pxbuffer);
NSParameterAssert(status == kCVReturnSuccessNULL);
CVPixelBufferLockBaseAddress(pxbuffer, 0);
voidCVPixelBufferGetBaseAddress(pxbuffer);
NSParameterAssert(pxdata != NULL);
CGColorSpaceRefCGColorSpaceCreateDeviceRGB();
CGContextRefCGBitmapContextCreate(pxdata, size.width, size.height, 8, 4*size.width, rgbColorSpace, kCGImageAlphaPremultipliedFirst);
NSParameterAssert(context);
CGContextDrawImage(context, CGRectMake(0, 0, CGImageGetWidth(image), CGImageGetHeight(image)), image);
CGColorSpaceRelease(rgbColorSpace);
CGContextRelease(context);
CVPixelBufferUnlockBaseAddress(pxbuffer, 0);
return pxbuffer;
}
