将NSData转换为CMSampleBufferRef

Question

有没有办法从NSData创建CMSampleBufferRef？NSData对象以前也是从CMSampleBufferRef构建的。我需要转换，因为我想保存CMSampleBufferRef帧(作为NSData)，这些帧是使用AVFoundation从现场摄像机拍摄的，然后能够使用CMSampleBufferRef帧(通过将NSData对象转换为CMSampleBufferRef)来构建视频。

先谢谢你...

Answer 1

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-(AudioBufferList *) getBufferListFromData: (NSData *) data
{
       if (data.length > 0)
       {
            NSUInteger len = [data length];
            //I guess you can use Byte*, void* or Float32*. I am not sure if that makes any difference.
            Byte * byteData = (Byte*) malloc (len);
            memcpy (byteData, [data bytes], len);
            if (byteData)
            {
                 AudioBufferList * theDataBuffer =(AudioBufferList*)malloc(sizeof(AudioBufferList) * 1);
                 theDataBuffer->mNumberBuffers = 1;
                 theDataBuffer->mBuffers[0].mDataByteSize = len;
                 theDataBuffer->mBuffers[0].mNumberChannels = 1;
                 theDataBuffer->mBuffers[0].mData = byteData;
                 // Read the data into an AudioBufferList
                 return theDataBuffer;
             }
        }
        return nil;
}

​