atom_trun.cpp

来自「6410BSP1」· C++ 代码 · 共 80 行

/*
 * 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. 2001.  All Rights Reserved.
 * 
 * Contributor(s): 
 *        Dave Mackie        [e-mail]
 */

#include "mp4common.h"

MP4TrunAtom::MP4TrunAtom() 
    : MP4Atom("trun")
{
    AddVersionAndFlags();    /* 0, 1 */
    AddProperty( /* 2 */
        new MP4Integer32Property("sampleCount"));
}

void MP4TrunAtom::AddProperties(u_int32_t flags)
{
    if (flags & 0x01) {
        // Note this is a signed 32 value
        AddProperty(
            new MP4Integer32Property("dataOffset"));
    }
    if (flags & 0x04) {
        AddProperty(
            new MP4Integer32Property("firstSampleFlags"));
    }

    MP4TableProperty* pTable = 
      new MP4TableProperty("samples", 
                   (MP4Integer32Property *)m_pProperties[2]);
    AddProperty(pTable);

    if (flags & 0x100) {
        pTable->AddProperty(
            new MP4Integer32Property("sampleDuration"));
    }
    if (flags & 0x200) {
        pTable->AddProperty(
            new MP4Integer32Property("sampleSize"));
    }
    if (flags & 0x400) {
        pTable->AddProperty(
            new MP4Integer32Property("sampleFlags"));
    }
    if (flags & 0x800) {
        pTable->AddProperty(
            new MP4Integer32Property("sampleCompositionTimeOffset"));
    }
}

void MP4TrunAtom::Read()
{
    /* read atom version, flags, and sampleCount */
    ReadProperties(0, 3);

    /* need to create the properties based on the atom flags */
    AddProperties(GetFlags());

    /* now we can read the remaining properties */
    ReadProperties(3);

    Skip();    // to end of atom
}