ios 图片转视频

转自：http://blog.iosxcode4.com/archives/160

用到的FrameWork有：

MediaPlayer.framework,QuartzCore.framework,CoreVideoframework,CoreMedia.framework,AVFoundation.framework

代码如下：



- (void) testCompressionSession

{

NSArray *imageArr = [NSArray arrayWithObjects:[[UIImage imageNamed:@"114.png"] CGImage],[[UIImage imageNamed:@"114.png"] CGImage],[[UIImage imageNamed:@"placeholderImage.png"] CGImage],[[UIImage imageNamed:@"dfd.png"] CGImage],[[UIImage imageNamed:@"viewbg.png"] CGImage], nil];

CGSize size = CGSizeMake(480, 320);

NSString *betaCompressionDirectory = [NSHomeDirectory() stringByAppendingPathComponent:@"Documents/Movie.m4v"];

NSError *error = nil;

unlink([betaCompressionDirectory UTF8String]);

//----initialize compression engine

AVAssetWriter *videoWriter = [[AVAssetWriter alloc] initWithURL:[NSURL fileURLWithPath:betaCompressionDirectory]

fileType:AVFileTypeQuickTimeMovie

error:&error];

NSParameterAssert(videoWriter);

if(error)

NSLog(@"error = %@", [error localizedDescription]);

NSDictionary *videoSettings = [NSDictionary dictionaryWithObjectsAndKeys:AVVideoCodecH264, AVVideoCodecKey,

[NSNumber numberWithInt:size.width], AVVideoWidthKey,

[NSNumber numberWithInt:size.height], AVVideoHeightKey, nil];

AVAssetWriterInput *writerInput = [AVAssetWriterInput assetWriterInputWithMediaType:AVMediaTypeVideo outputSettings:videoSettings];

NSDictionary *sourcePixelBufferAttributesDictionary = [NSDictionary dictionaryWithObjectsAndKeys:

[NSNumber numberWithInt:kCVPixelFormatType_32ARGB], kCVPixelBufferPixelFormatTypeKey, nil];

AVAssetWriterInputPixelBufferAdaptor *adaptor = [AVAssetWriterInputPixelBufferAdaptor assetWriterInputPixelBufferAdaptorWithAssetWriterInput:writerInput

sourcePixelBufferAttributes:sourcePixelBufferAttributesDictionary];

NSParameterAssert(writerInput);

NSParameterAssert([videoWriter canAddInput:writerInput]);

if ([videoWriter canAddInput:writerInput])

NSLog(@"I can add this input");

else

NSLog(@"i can't add this input");

[videoWriter addInput:writerInput];

[videoWriter startWriting];

[videoWriter startSessionAtSourceTime:kCMTimeZero];

//---

// insert demo debugging code to write the same image repeated as a movie

CGImageRef theImage = [[UIImage imageNamed:@"114.png"] CGImage];

dispatch_queue_t    dispatchQueue = dispatch_queue_create("mediaInputQueue", NULL);

int __block         frame = 0;

[writerInput requestMediaDataWhenReadyOnQueue:dispatchQueue usingBlock:^{

while ([writerInput isReadyForMoreMediaData])

{

if(++frame >= imageArr.count * 40)

{

[writerInput markAsFinished];

[videoWriter finishWriting];

break;

}

int idx = frame/40;

CVPixelBufferRef buffer = (CVPixelBufferRef)[self pixelBufferFromCGImage:(__bridge CGImageRef)([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");

}

- (CVPixelBufferRef )pixelBufferFromCGImage:(CGImageRef)image size:(CGSize)size

{

NSDictionary *options = [NSDictionary dictionaryWithObjectsAndKeys:

[NSNumber numberWithBool:YES], kCVPixelBufferCGImageCompatibilityKey,

[NSNumber numberWithBool:YES], kCVPixelBufferCGBitmapContextCompatibilityKey, nil];

CVPixelBufferRef pxbuffer = NULL;

CVReturn status = CVPixelBufferCreate(kCFAllocatorDefault, size.width, size.height, kCVPixelFormatType_32ARGB, (__bridge CFDictionaryRef) options, &pxbuffer);

// CVReturn status = CVPixelBufferPoolCreatePixelBuffer(NULL, adaptor.pixelBufferPool, &pxbuffer);

NSParameterAssert(status == kCVReturnSuccess && pxbuffer != NULL);

CVPixelBufferLockBaseAddress(pxbuffer, 0);

void *pxdata = CVPixelBufferGetBaseAddress(pxbuffer);

NSParameterAssert(pxdata != NULL);

CGColorSpaceRef rgbColorSpace = CGColorSpaceCreateDeviceRGB();

CGContextRef context = CGBitmapContextCreate(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;

}