fileformats/mp4/composer/include/renderable.h

/* ------------------------------------------------------------------
 * Copyright (C) 1998-2009 PacketVideo
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *      http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either
 * express or implied.
 * See the License for the specific language governing permissions
 * and limitations under the License.
 * -------------------------------------------------------------------
 */
/*
    This PVA_FF_Renderable Class is the base class for ALL other components of the MP4
    file format - including Atoms, Descriptors, and Commands.  This class provides
    the renderToFileStream(...) and readFromFileStream(...) pure virtual methods.
*/


#ifndef __Renderable_H__
#define __Renderable_H__

#include "atomutils.h"

class PVA_FF_Renderable
{

    public:
        virtual ~PVA_FF_Renderable() {}

        // Rendering the PVA_FF_Atom in proper format (bitlengths, etc.) to an ofstream
        // Each subclass will override this method to render its own contents.
        virtual bool renderToFileStream(MP4_AUTHOR_FF_FILE_IO_WRAP *fp) = 0;

        virtual uint32 getSize() const = 0;

        virtual MP4_AUTHOR_FF_FILE_IO_WRAP* dump(MP4_AUTHOR_FF_FILE_IO_WRAP *fp)
        {
            return fp;
        }

};

class PVA_FF_BufferHolder : public PVA_FF_Renderable
{

    public:
        PVA_FF_BufferHolder(uint8* buf, int32 size)
        {
            _dataBuffer = NULL;
            _dataSize   = 0;

            if (size > 0)
            {
                _dataBuffer = (uint8*)(oscl_malloc(sizeof(uint8) * size));
                oscl_memcpy(_dataBuffer, buf, size);
                _dataSize   = size;
            }
        };

        virtual ~PVA_FF_BufferHolder()
        {
            if (_dataBuffer != NULL)
            {
                oscl_free(_dataBuffer);
            }
        }

        // Rendering the PVA_FF_Atom in proper format (bitlengths, etc.) to an ofstream
        // Each subclass will override this method to render its own contents.
        virtual bool renderToFileStream(MP4_AUTHOR_FF_FILE_IO_WRAP *fp)
        {
            if (_dataBuffer != NULL)
            {
                if (!PVA_FF_AtomUtils::renderByteData(fp, (uint32)_dataSize, _dataBuffer))
                {
                    return false;
                }
            }
            return true;
        };

        virtual uint32 getSize() const
        {
            return _dataSize;
        }

    private:
        uint8*   _dataBuffer;
        int32    _dataSize;

};


#endif