/*** 裁剪圖片** @param image 圖片* @param bounds 大小**/ + (UIImage *)croppedImage:(UIImage *)image bounds:(CGRect)bounds {CGImageRef imageRef = CGImageCreateWithImageInRect([image CGImage], bounds);UIImage *croppedImage = [UIImage imageWithCGImage:imageRef];CGImageRelease(imageRef);return croppedImage; }+ (UIImage *)clipImage:(UIImage *)image ScaleWithsize:(CGSize)asize {UIImage *newimage;if (nil == image) {newimage = nil;}else{CGSize oldsize = image.size;CGRect rect;if (asize.width/asize.height > oldsize.width/oldsize.height) {rect.size.width = asize.width;rect.size.height = asize.width*oldsize.height/oldsize.width;rect.origin.x = 0;rect.origin.y = (asize.height - rect.size.height)/2;}else{rect.size.width = asize.height*oldsize.width/oldsize.height;rect.size.height = asize.height;rect.origin.x = (asize.width - rect.size.width)/2;rect.origin.y = 0;}UIGraphicsBeginImageContext(asize);CGContextRef context = UIGraphicsGetCurrentContext();CGContextClipToRect(context, CGRectMake(0, 0, asize.width, asize.height));CGContextSetFillColorWithColor(context, [[UIColor clearColor] CGColor]);UIRectFill(CGRectMake(0, 0, asize.width, asize.height));//clear background[image drawInRect:rect];newimage = UIGraphicsGetImageFromCurrentImageContext();UIGraphicsEndImageContext();}return newimage; }+ (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);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);//CGSize drawSize = CGSizeMake(CGImageGetWidth(image), CGImageGetHeight(image));//BOOL baseW = drawSize.width < drawSize.height;CGContextDrawImage(context, CGRectMake(0, 0, CGImageGetWidth(image), CGImageGetHeight(image)), image);CGColorSpaceRelease(rgbColorSpace);CGContextRelease(context);CVPixelBufferUnlockBaseAddress(pxbuffer, 0);return pxbuffer; }/*** 多張圖片合成視頻**/ - (void)compressImages:(NSArray <UIImage *> *)images completion:(void(^)(NSURL *outurl))block; {//先裁剪圖片NSMutableArray *imageArray = [NSMutableArray array];for (UIImage *image in images){CGRect rect = CGRectMake(0, 0,image.size.width, image.size.height);if (rect.size.width < rect.size.height){rect.origin.y = (rect.size.height - rect.size.width)/2;rect.size.height = rect.size.width;}else{rect.origin.x = (rect.size.width - rect.size.height)/2;rect.size.width = rect.size.height;}//裁剪UIImage *newImage = [videoUtils croppedImage:image bounds:rect];/*** 縮放*/UIImage *finalImage = [videoUtils clipImage:newImage ScaleWithsize:CGSizeMake(640, 640)];[imageArray addObject:finalImage];}NSDate *date = [NSDate date];NSString *string = [NSString stringWithFormat:@"%ld.mov",(unsigned long)(date.timeIntervalSince1970 * 1000)];NSString *cachePath = [NSTemporaryDirectory() stringByAppendingPathComponent:string];if ([[NSFileManager defaultManager] fileExistsAtPath:cachePath]){[[NSFileManager defaultManager] removeItemAtPath:cachePath error:nil];}NSURL *exportUrl = [NSURL fileURLWithPath:cachePath];CGSize size = CGSizeMake(640,640);//定義視頻的大小__block AVAssetWriter *videoWriter = [[AVAssetWriter alloc] initWithURL:exportUrlfileType:AVFileTypeQuickTimeMovieerror:nil];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 = [AVAssetWriterInputPixelBufferAdaptorassetWriterInputPixelBufferAdaptorWithAssetWriterInput:writerInput sourcePixelBufferAttributes:sourcePixelBufferAttributesDictionary];NSParameterAssert(writerInput);NSParameterAssert([videoWriter canAddInput:writerInput]);if ([videoWriter canAddInput:writerInput])NSLog(@"");elseNSLog(@"");[videoWriter addInput:writerInput];[videoWriter startWriting];[videoWriter startSessionAtSourceTime:kCMTimeZero];//合成多張圖片為一個視頻文件dispatch_queue_t dispatchQueue = dispatch_queue_create("mediaInputQueue", NULL);int __block frame = 0;__weak typeof(self) ws = self;[writerInput requestMediaDataWhenReadyOnQueue:dispatchQueue usingBlock:^{while ([writerInput isReadyForMoreMediaData]){if(++frame > 8 * 30){[writerInput markAsFinished];//[videoWriter_ finishWriting];if(videoWriter.status == AVAssetWriterStatusWriting){NSCondition *cond = [[NSCondition alloc] init];[cond lock];[videoWriter finishWritingWithCompletionHandler:^{[cond lock];[cond signal];[cond unlock];}];[cond wait];[cond unlock];!block?:block(exportUrl);}break;}CVPixelBufferRef buffer = NULL;int idx = frame/30 * images.count/8;if (idx >= images.count) {idx = images.count - 1;}buffer = (CVPixelBufferRef)[videoUtils pixelBufferFromCGImage:[[imageArray objectAtIndex:idx] CGImage] size:size];if (buffer){if(![adaptor appendPixelBuffer:buffer withPresentationTime:CMTimeMake(frame, 30)]){LPLog(@"fail");}else{LPLog(@"success:%ld",frame);}CFRelease(buffer);}}}];}

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