atom_meta.cpp

来自「6410BSP1」· C++ 代码 · 共 85 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):
 *      M. Bakker     mbakker at nero.com
 *
 * Apple iTunes META data
 */

#include "mp4common.h"

MP4Meta1Atom::MP4Meta1Atom(const char *name)
    : MP4Atom(name)
{
  AddVersionAndFlags(); /* 0, 1 */

  AddProperty(new MP4BytesProperty("metadata")); /* 2 */
}

void MP4Meta1Atom::Read() 
{
    // calculate size of the metadata from the atom size
    ((MP4BytesProperty*)m_pProperties[2])->SetValueSize(m_size - 4);

    MP4Atom::Read();
}

MP4DataAtom::MP4DataAtom()
    : MP4Atom("data")
{
    AddVersionAndFlags(); /* 0, 1 */
    AddReserved("reserved2", 4); /* 2 */

    AddProperty(
        new MP4BytesProperty("metadata")); /* 3 */
}

void MP4DataAtom::Read() 
{
    // calculate size of the metadata from the atom size
    ((MP4BytesProperty*)m_pProperties[3])->SetValueSize(m_size - 8);

    MP4Atom::Read();
}


// MP4Meta2Atom is for \251nam and \251cmt flags, which appear differently
// in .mov and in itunes file.  In .movs, they appear under udata, in 
// itunes, they appear under ilst.
MP4Meta2Atom::MP4Meta2Atom (const char *name) : MP4Atom(name)
{
}

void MP4Meta2Atom::Read ()
{
  MP4Atom *parent = GetParentAtom();
  if (ATOMID(parent->GetType()) == ATOMID("udta")) {
    // add data property
    AddReserved("reserved2", 4); /* 0 */

    AddProperty(
        new MP4BytesProperty("metadata")); /* 1 */
    ((MP4BytesProperty*)m_pProperties[1])->SetValueSize(m_size - 4);
  } else {
    ExpectChildAtom("data", Required, OnlyOne);
  }
  MP4Atom::Read();
}