atom_stbl.cpp

来自「MPEG-4编解码的实现(包括MPEG4视音频编解码)」· C++ 代码 · 共 58 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"

MP4StblAtom::MP4StblAtom() 
	: MP4Atom("stbl") 
{
	ExpectChildAtom("stsd", Required, OnlyOne);
	ExpectChildAtom("stts", Required, OnlyOne);
	ExpectChildAtom("ctts", Optional, OnlyOne);
	ExpectChildAtom("stsz", Required, OnlyOne);
	ExpectChildAtom("stsc", Required, OnlyOne);
	ExpectChildAtom("stco", Optional, OnlyOne);
	ExpectChildAtom("co64", Optional, OnlyOne);
	ExpectChildAtom("stss", Optional, OnlyOne);
	ExpectChildAtom("stsh", Optional, OnlyOne);
	ExpectChildAtom("stdp", Optional, OnlyOne);
}

void MP4StblAtom::Generate()
{
	// as usual
	MP4Atom::Generate();

	// but we also need one of the chunk offset atoms
	MP4Atom* pChunkOffsetAtom;
	if (m_pFile->Use64Bits()) {
		pChunkOffsetAtom = CreateAtom("co64");
	} else {
		pChunkOffsetAtom = CreateAtom("stco");
	}

	AddChildAtom(pChunkOffsetAtom);

	// and ask it to self generate
	pChunkOffsetAtom->Generate();
}