fileformats/mp4/composer/src/es_id_inc.cpp

/* ------------------------------------------------------------------
 * 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 ESID_Inc Class contains information on the Elementary Stream that will
	be replaced when streaming to a client.  The file format replaces the actual
	ES_Descriptor with this object that references the actual descriptor.
*/

#define IMPLEMENT_ES_ID_Inc

#include "es_id_inc.h"
#include "atomutils.h"
#include "a_atomdefs.h"


// Alternate constructor
PVA_FF_ES_ID_Inc::PVA_FF_ES_ID_Inc(uint32 trackid)
        : PVA_FF_BaseDescriptor(ES_ID_INC_DESCR_TAG),
        _trackID(trackid)
{
    recomputeSize();
}

// Destructor
PVA_FF_ES_ID_Inc::~PVA_FF_ES_ID_Inc()
{
    // Empty
}


void
PVA_FF_ES_ID_Inc::recomputeSize()
{
    _sizeOfClass = 4;
    _sizeOfSizeField = 1;
    // | (8) | (8)  |   (32)   |
    // | tag | size | track_id |
}

// Rendering the PVA_FF_Atom in proper format (bitlengths, etc.) to an ostream
bool
PVA_FF_ES_ID_Inc::renderToFileStream(MP4_AUTHOR_FF_FILE_IO_WRAP *fp)
{
    int32 rendered = 0; // Keep track of number of bytes rendered

    // Render attributes of the PVA_FF_BaseDescriptor class
    int32 numBytes = renderBaseDescriptorMembers(fp);

    if (numBytes == 0)
    {
        return false;
    }
    rendered += numBytes; // (1 + 1(variable) for _sizeOfClass)

    // Render the ESID
    if (!PVA_FF_AtomUtils::render32(fp, getTrackID()))
    {
        return false;
    }
    rendered += 4;

    return true;
}