VariableSizeEssenceParser.h

/*
 * Parse raw essence data with variable frame size
 *
 * Copyright (C) 2009, British Broadcasting Corporation
 * All Rights Reserved.
 *
 * Author: Philip de Nier
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions are met:
 *
 *     * Redistributions of source code must retain the above copyright notice,
 *       this list of conditions and the following disclaimer.
 *     * Redistributions in binary form must reproduce the above copyright
 *       notice, this list of conditions and the following disclaimer in the
 *       documentation and/or other materials provided with the distribution.
 *     * Neither the name of the British Broadcasting Corporation nor the names
 *       of its contributors may be used to endorse or promote products derived
 *       from this software without specific prior written permission.
 *
 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
 * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
 * ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE
 * LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
 * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
 * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
 * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
 * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
 * POSSIBILITY OF SUCH DAMAGE.
 */

#ifndef __VARIABLE_SIZE_ESSENCE_PARSER_H__
#define __VARIABLE_SIZE_ESSENCE_PARSER_H__

#include "RawEssenceParser.h"


class MJPEGParseState
{
public:
    MJPEGParseState();

    void Reset();

public:
    uint32_t resolution_id;

    DynamicByteArray buffer;
    uint32_t position;
    uint32_t prev_position;

    bool end_of_field;
    bool field2;
    int skip_count;
    bool have_len_byte1;
    bool have_len_byte2;

    int marker_state;
};


class VariableSizeEssenceParser : public RawEssenceParser
{
public:
    VariableSizeEssenceParser(mxfpp::File *file, int64_t essence_length, mxfUL essence_label, mxfRational edit_rate,
                              const mxfpp::FileDescriptor *file_descriptor,
                              FrameOffsetIndexTableSegment *index_table);
    virtual ~VariableSizeEssenceParser();

public:
    // from RawEssenceParser
    virtual bool Read(DynamicByteArray *data, uint32_t *num_samples);
    virtual bool Seek(int64_t position);
    virtual int64_t DetermineDuration();

private:
    uint32_t DetermineUncFrameSize(const mxfpp::FileDescriptor *file_descriptor);
    bool ParseMJPEGImage(DynamicByteArray *image_data);
    bool ProcessMJPEGImageData(DynamicByteArray *image_data, bool *have_image);
    bool UpdateIndexTable(DynamicByteArray *image_data, int64_t position);

private:
    FrameOffsetIndexTableSegment *mIndexTable;
    bool mOwnIndexTable;
    bool mIndexTableIsComplete;

    uint32_t mFrameSizeEstimate;

    MJPEGParseState mMJPEGParseState;

    DynamicByteArray mSeekData;
};


#endif