imagesToVideo 合成Boomerang 效果的视频

移除目标路径下的视频

 NSString *tempPath = [NSHomeDirectory() stringByAppendingPathComponent:@"Documents/BoomMovie.mp4"];
            [[NSFileManager defaultManager] removeItemAtPath:tempPath error:NULL];

 [self imagesToVideo:self.allImgsArr];

-(void) imagesToVideo:(NSMutableArray*) images
{

    //视频的尺寸
    int width = widthq;
    int heigth = heigthq;
    
    NSError *error = nil;
    
    NSString *imagePath = [NSHomeDirectory() stringByAppendingPathComponent:@"Documents/BoomMovie.mp4"];
    
        AVAssetWriter *videoWriter = [[AVAssetWriter alloc] initWithURL:
                                      [NSURL fileURLWithPath:imagePath] fileType:AVFileTypeQuickTimeMovie
                                                                  error:&error];
    
    NSDictionary *videoSettings = [NSDictionary dictionaryWithObjectsAndKeys:
                                   AVVideoCodecJPEG, AVVideoCodecKey,
                                   [NSNumber numberWithInt:width], AVVideoWidthKey,
                                   [NSNumber numberWithInt:heigth], AVVideoHeightKey,
                                   nil];

    AVAssetWriterInput* writerInput = [AVAssetWriterInput
                                       assetWriterInputWithMediaType:AVMediaTypeVideo
                                       outputSettings:videoSettings];
    
    NSParameterAssert(writerInput);
    NSParameterAssert([videoWriter canAddInput:writerInput]);
    [videoWriter addInput:writerInput];
    
    
    //属性设置
    NSMutableDictionary *dapattributes = [[NSMutableDictionary alloc] init];
     [dapattributes setObject:[NSNumber numberWithUnsignedInt:kCVPixelFormatType_32ARGB] forKey:(NSString*)kCVPixelBufferPixelFormatTypeKey];
    [dapattributes setObject:[NSNumber numberWithUnsignedInt:width] forKey:(NSString*)kCVPixelBufferWidthKey];
    [dapattributes setObject:[NSNumber numberWithUnsignedInt:heigth] forKey:(NSString*)kCVPixelBufferHeightKey];
    
    AVAssetWriterInputPixelBufferAdaptor *adaptor = [AVAssetWriterInputPixelBufferAdaptor assetWriterInputPixelBufferAdaptorWithAssetWriterInput:writerInput sourcePixelBufferAttributes:dapattributes];
    
    writerInput.expectsMediaDataInRealTime = YES;
    
    if (![videoWriter startWriting]) {
        // Error!
        return;
    }
    
    // 开始生成
    [videoWriter startSessionAtSourceTime:kCMTimeZero];
    
    
    CVPixelBufferRef buffer = NULL;
    
    int frameCount = 0;
    
    int aaaa = images.count/videoTime/2;
    
    int32_t fps = (int32_t)(24);
    
    // 每一帧的时间
    float durationForEachImage = 1.0 / fps;
    
    for (UIImage *image in images) {
        
        @autoreleasepool {
            //            if (!adaptor.assetWriterInput.readyForMoreMediaData) {
            //                break;
            //            }
            
            // 视频的时间
            CMTime frameTime = CMTimeMake(frameCount, fps);
            
            // 合成流
            buffer = [self pixelBufferFromCGImage:image.CGImage];
            
            BOOL aaaaa = [adaptor appendPixelBuffer:buffer withPresentationTime:frameTime];
            
            NSLog(@"aaaaadaptor:%d",aaaaa);
    
            if (!aaaaa) {
                // Error!
            }
            
            if (buffer) {
//                CVBufferRelease(buffer);
                CFRelease(buffer);
            }
            
            frameCount++;
        }
    }
    
    [writerInput markAsFinished];
    [videoWriter endSessionAtSourceTime:CMTimeMake((int64_t)(frameCount - 1) * fps * durationForEachImage, fps)];
    
    [videoWriter finishWritingWithCompletionHandler:^{
        // Finish!
//        UISaveVideoAtPathToSavedPhotosAlbum(imagePath, nil, nil, nil);
        NSLog(@"done!!");
        if ([self.delegate respondsToSelector:@selector(backBoomVideoPath:)]) {
            [self.delegate backBoomVideoPath:imagePath];
        }
        
    }];
    
    // 注意释放
    CVPixelBufferPoolRelease(adaptor.pixelBufferPool);
    
}

- (CVPixelBufferRef)pixelBufferFromCGImage:(CGImageRef)image
{

    int width = widthq;
    int height = heigthq;

    
    NSDictionary *options = @{ (NSString *)kCVPixelBufferCGImageCompatibilityKey: @YES,
                               (NSString *)kCVPixelBufferCGBitmapContextCompatibilityKey: @YES, };
    

    
    CVPixelBufferRef pxbuffer = NULL;
    

    
    CVPixelBufferCreate(kCFAllocatorDefault,
                        width,
                        height,
                        kCVPixelFormatType_32ARGB,
                        (__bridge CFDictionaryRef)options,
                        &pxbuffer);
    
    CVPixelBufferLockBaseAddress(pxbuffer, 0);
    void *pxdata = CVPixelBufferGetBaseAddress(pxbuffer);
    
    size_t bitsPerComponent       = 8;
    size_t bytesPerRow            = 4 * width;
    CGColorSpaceRef rgbColorSpace = CGColorSpaceCreateDeviceRGB();
    CGContextRef context = CGBitmapContextCreate(pxdata,
                                                 width,
                                                 height,
                                                 bitsPerComponent,
                                                 CVPixelBufferGetBytesPerRow(pxbuffer),
                                                 rgbColorSpace,
                                                 (CGBitmapInfo)kCGImageAlphaPremultipliedFirst);
    
    

//    
//    size_t buffwidth = CVPixelBufferGetWidth(pxbuffer);
//    size_t buffheight = CVPixelBufferGetHeight(pxbuffer);
    
    NSLog(@"%zu",CVPixelBufferGetBytesPerRow(pxbuffer));
    
    CGContextDrawImage(context, CGRectMake(0, 0, width, height), image);
    CGColorSpaceRelease(rgbColorSpace);
    CGContextRelease(context);
    
    CVPixelBufferUnlockBaseAddress(pxbuffer, 0);
    
    return pxbuffer;
}