gistfile1.m

- (void) readNextMovieFrame
{
    
    AVAssetReaderTrackOutput * output = [_movieReader.outputs objectAtIndex:0];
    CMSampleBufferRef sampleBuffer = [output copyNextSampleBuffer];
    if (sampleBuffer)
    {
        
        CVImageBufferRef imageBuffer = CMSampleBufferGetImageBuffer(sampleBuffer);
        
        // Lock the image buffer
        CVPixelBufferLockBaseAddress(imageBuffer,0);
        // Get information of the image
        uint8_t *baseAddress __attribute__((unused)) = (uint8_t *)CVPixelBufferGetBaseAddress(imageBuffer);
        size_t bytesPerRow __attribute__((unused)) = CVPixelBufferGetBytesPerRow(imageBuffer);
        size_t width __attribute__((unused)) = CVPixelBufferGetWidth(imageBuffer);
        size_t height __attribute__((unused)) = CVPixelBufferGetHeight(imageBuffer);
        
        //
        //  Here's where you can process the buffer!
        //
        
        
        /*We unlock the  image buffer*/
        CVPixelBufferUnlockBaseAddress(imageBuffer,0);

        /*Create a CGImageRef from the CVImageBufferRef*/
        CGColorSpaceRef colorSpace = CGColorSpaceCreateDeviceRGB();
        CGContextRef newContext = CGBitmapContextCreate(baseAddress, width, height, 8, bytesPerRow, colorSpace, kCGBitmapByteOrder32Little | kCGImageAlphaPremultipliedFirst);
        CGImageRef newImage = CGBitmapContextCreateImage(newContext);
        
        /*We release some components*/
        CGContextRelease(newContext);
        CGColorSpaceRelease(colorSpace);
        
        
        /*We display the result on the image view (We need to change the orientation of the image so that the video is displayed correctly)*/
        UIImage *image  = [UIImage imageWithCGImage:newImage scale:1.0 orientation:UIImageOrientationRight];
        
        dispatch_async(dispatch_get_main_queue(), ^{
            
            CCTexture2D *tex = [[CCTextureCache sharedTextureCache] addCGImage:image.CGImage forKey:[NSString stringWithFormat:@"%i",_currentTex2D]];
            for (Puzzle *p in _cache) {
                [p setTexture: tex];
            }
        });
        
        CGImageRelease(newImage);
        //
        //  Finish processing the buffer!
        //
        
        // Unlock the image buffer
        CVPixelBufferUnlockBaseAddress(imageBuffer,0);
        CFRelease(sampleBuffer);
        /*We relase the CGImageRef*/

    }
}