BitstreamIO class

#include "bitstreamIO.h"
#include <fstream>
#include <iostream>
//#include "sample_defs.h"
//#include "exceptions.h"

BitstreamIO::BitstreamIO(mfxBitstream *h264Bitstream)
{
    h264BitstreamLength = sizeof(h264Bitstream);
    curH264Bitstream = (mfxBitstream *)malloc(sizeof(h264Bitstream));
}

BitstreamIO::~BitstreamIO()
{

}

void BitstreamIO::switchStreams(mfxBitstream *h264Bitstream)
{
    free(curH264Bitstream->Data);
    free(curH264Bitstream);
    //h264BitstreamLength = sizeof(h264Bitstream);
    curH264Bitstream = (mfxBitstream *)malloc(sizeof(h264Bitstream));
    memset(curH264Bitstream,0,sizeof(curH264Bitstream));

    curH264Bitstream->Data = (mfxU8 *)malloc(h264Bitstream->DataLength);
    curH264Bitstream->DataLength = h264Bitstream->DataLength;
    curH264Bitstream->DataOffset = h264Bitstream->DataOffset;
    curH264Bitstream->MaxLength = h264Bitstream->MaxLength;

    memcpy(curH264Bitstream->Data,h264Bitstream->Data,h264Bitstream->DataLength);
}

//Only function needed since only using this class to read a h264 frame from a bitstream
//Note: must remember to free outBitstream later
mfxI32 BitstreamIO::Read(mfxBitstream *outBitstream)
{
    //Again, not thread safe
    //outBitstream=h264BitstreamPtr;

    outBitstream->DataLength = curH264Bitstream->DataLength;
    outBitstream->DataFlag = curH264Bitstream->DataFlag;
    outBitstream->DataOffset = curH264Bitstream->DataOffset;
    outBitstream->MaxLength = curH264Bitstream->MaxLength;
    outBitstream->TimeStamp = curH264Bitstream->TimeStamp;

    if(curH264Bitstream->Data != NULL)
    {
        if(outBitstream->Data != NULL)
        {
            free(outBitstream->Data);
        }

        if(outBitstream->DataLength != 0)
        {
            outBitstream->Data = (mfxU8 *)malloc(curH264Bitstream->DataLength);
            memcpy(outBitstream->Data,curH264Bitstream->Data,outBitstream->DataLength);
        }
    }

    mfxI32 nBytesRead = h264BitstreamLength;

    return nBytesRead;
}

//Do not currently need to use if only using this class to read a h264 frame from a bitstream
mfxI32 BitstreamIO::Write(mfxBitstream *outBitStream)
{
    return 0;
}

//Do not currently need to use if only using this class to read a h264 frame from a bitstream
mfxI64 BitstreamIO::Seek(mfxI64 offset, mfxSeekOrigin origin)
{
    return origin;
}