umc_byte_iterator.h

audio-video-codecs.rar语音编解码器

/*
//
//                  INTEL CORPORATION PROPRIETARY INFORMATION
//     This software is supplied under the terms of a license agreement or
//     nondisclosure agreement with Intel Corporation and may not be copied
//     or disclosed except in accordance with the terms of that agreement.
//          Copyright(c) 2003-2007 Intel Corporation. All Rights Reserved.
//
*/

#ifndef __UMC_BYTE_ITERATOR_H__
#define __UMC_BYTE_ITERATOR_H__

#include "umc_defs.h"
#if defined (UMC_ENABLE_H264_SPLITTER)

#include "ippdefs.h"
#include "umc_structures.h"
#include "umc_media_data.h"

namespace UMC
{
    /**
     * Simple iterator
     */
    class ByteIterator
    {
    public:
        ByteIterator(MediaData & p_data);
        ~ByteIterator();
        Status Increment(Ipp8u & o_byte);
    private:
        MediaData & m_data;
    };

    /**
     * The byte iterator with H.264 prevention support
     */
    class PrevH264ByteIterator
    {
    private:

        typedef enum PrevH264State
        {
            H264_PREV_NONE  = 0,
            H264_PREV_00    = 1,
            H264_PREV_00_00 = 2
        } PrevH264State;

    public:

        PrevH264ByteIterator(MediaData & p_data);
        virtual ~PrevH264ByteIterator();

        Status Increment(Ipp8u & o_byte);

    private:
        MediaData & m_data;
        PrevH264State m_state;
        Ipp32s m_iStart;

    };
} // namespace UMC

#endif // UMC_ENABLE_H264_SPLITTER
#endif // __UMC_BYTE_ITERATOR_H__