如何将CGImage转换为CMSampleBufferRef？

Question

我想将a转换CGImage为CMSampleBufferRef并AVAssetWriterInput使用该appendSampleBuffer:方法将其附加到a .我已经设法CMSampleBufferRef使用以下代码,但appendSampleBuffer:只是NO在我提供结果时返回CMSampleBufferRef.我究竟做错了什么？

- (void) appendCGImage: (CGImageRef) frame
{
    const int width = CGImageGetWidth(frame);
    const int height = CGImageGetHeight(frame);

    // Create a dummy pixel buffer to try the encoding
    // on something simple.
    CVPixelBufferRef pixelBuffer = NULL;
    CVReturn status = CVPixelBufferCreate(kCFAllocatorDefault, width, height,
        kCVPixelFormatType_32BGRA, NULL, &pixelBuffer);
    NSParameterAssert(status == kCVReturnSuccess && pixelBuffer != NULL);

    // Sample timing info.
    CMTime frameTime = CMTimeMake(1, 30);
    CMTime currentTime = CMTimeAdd(lastSampleTime, frameTime);
    CMSampleTimingInfo timing = {frameTime, currentTime, kCMTimeInvalid};

    OSStatus result = 0;

    // Sample format.
    CMVideoFormatDescriptionRef videoInfo = NULL;
    result = CMVideoFormatDescriptionCreateForImageBuffer(NULL,
         pixelBuffer, &videoInfo);
    NSParameterAssert(result == 0 && videoInfo != NULL);

    // Create sample buffer.
    CMSampleBufferRef sampleBuffer = NULL;
    result = CMSampleBufferCreateForImageBuffer(kCFAllocatorDefault,
        pixelBuffer, true, NULL, NULL, videoInfo, &timing, &sampleBuffer);
    NSParameterAssert(result == 0 && sampleBuffer != NULL);

    // Ship out the frame.
    NSParameterAssert(CMSampleBufferDataIsReady(sampleBuffer));
    NSParameterAssert([writerInput isReadyForMoreMediaData]);
    BOOL success = [writerInput appendSampleBuffer:frame];
    NSParameterAssert(success); // no go :(
}

PS我知道这段代码中存在内存泄漏,为了简单起见,我省略了一些代码.

Answer 1

啊哈,我完全错过AVAssetWriterInputPixelBufferAdaptor了专门用于将像素缓冲区管道输入到编写器输入中的类.现在代码工作,即使没有杂乱的CMSampleBuffer东西.