atom_avc1.cpp

6410BSP1

/*
 * The contents of this file are subject to the Mozilla Public
 * License Version 1.1 (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.mozilla.org/MPL/
 * 
 * Software distributed under the License is distributed on an "AS
 * IS" basis, WITHOUT WARRANTY OF ANY KIND, either express or
 * implied. See the License for the specific language governing
 * rights and limitations under the License.
 * 
 * The Original Code is MPEG4IP.
 * 
 * The Initial Developer of the Original Code is Cisco Systems Inc.
 * Portions created by Cisco Systems Inc. are
 * Copyright (C) Cisco Systems Inc. 2004.  All Rights Reserved.
 * 
 * Contributor(s): 
 *        Bill May [e-mail]
 */

#include "mp4common.h"

MP4Avc1Atom::MP4Avc1Atom() 
    : MP4Atom("avc1")
{
    AddReserved("reserved1", 6); /* 0 */

    AddProperty( /* 1 */
        new MP4Integer16Property("dataReferenceIndex"));

    AddReserved("reserved2", 16); /* 2 */

    AddProperty( /* 3 */
        new MP4Integer16Property("width"));
    AddProperty( /* 4 */
        new MP4Integer16Property("height"));

    AddReserved("reserved3", 14); /* 5 */

    MP4StringProperty* pProp = 
        new MP4StringProperty("compressorName");
    pProp->SetFixedLength(32);
    pProp->SetValue("AVC Coding");
    AddProperty(pProp); /* 6 */

    AddReserved("reserved4", 4); /* 7 */

    ExpectChildAtom("avcC", Required, OnlyOne);
    ExpectChildAtom("btrt", Optional, OnlyOne);
    // for now ExpectChildAtom("m4ds", Optional, OnlyOne);
}

void MP4Avc1Atom::Generate()
{
    MP4Atom::Generate();

    ((MP4Integer16Property*)m_pProperties[1])->SetValue(1);

    // property reserved3 has non-zero fixed values
    static u_int8_t reserved3[14] = {
        0x00, 0x48, 0x00, 0x00, 
        0x00, 0x48, 0x00, 0x00, 
        0x00, 0x00, 0x00, 0x00, 
        0x00, 0x01,
    };
    m_pProperties[5]->SetReadOnly(false);
    ((MP4BytesProperty*)m_pProperties[5])->
        SetValue(reserved3, sizeof(reserved3));
    m_pProperties[5]->SetReadOnly(true);

    // property reserved4 has non-zero fixed values
    static u_int8_t reserved4[4] = {
        0x00, 0x18, 0xFF, 0xFF, 
    };
    m_pProperties[7]->SetReadOnly(false);
    ((MP4BytesProperty*)m_pProperties[7])->
        SetValue(reserved4, sizeof(reserved4));
    m_pProperties[7]->SetReadOnly(true);
}