小编use*_*720的帖子

我正在尝试解码 .H264 视频数据的原始流，但我找不到创建正确的方法

    - (void)decodeFrameWithNSData:(NSData*)data presentationTime:

(CMTime)presentationTime
{

    @autoreleasepool {

    CMSampleBufferRef sampleBuffer = NULL;
    CMBlockBufferRef blockBuffer = NULL;
    VTDecodeInfoFlags infoFlags;
    int sourceFrame;

    if( dSessionRef == NULL )
        [self createDecompressionSession];


    CMSampleTimingInfo timingInfo ;
    timingInfo.presentationTimeStamp = presentationTime;
    timingInfo.duration =  CMTimeMake(1,100000000);
    timingInfo.decodeTimeStamp = kCMTimeInvalid;

    //Creates block buffer from NSData
    OSStatus status  = CMBlockBufferCreateWithMemoryBlock(CFAllocatorGetDefault(), (void*)data.bytes,data.length*sizeof(char), CFAllocatorGetDefault(), NULL, 0, data.length*sizeof(char), 0, &blockBuffer);

    //Creates CMSampleBuffer to feed decompression session    
    status = CMSampleBufferCreateReady(CFAllocatorGetDefault(), blockBuffer,self.encoderVideoFormat,1,1,&timingInfo, 0, 0, &sampleBuffer);

    status = VTDecompressionSessionDecodeFrame(dSessionRef,sampleBuffer, kVTDecodeFrame_1xRealTimePlayback, &sourceFrame,&infoFlags);


    if(status != noErr) {
        NSLog(@"Decode …