atom_elst.cpp

网络MPEG4IP流媒体开发源代码

/*
 * 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"

MP4ElstAtom::MP4ElstAtom() 
	: MP4Atom("elst") 
{ 
	AddVersionAndFlags();

	MP4Integer32Property* pCount = 
		new MP4Integer32Property("entryCount"); 
	AddProperty(pCount);

	MP4TableProperty* pTable = new MP4TableProperty("entries", pCount);
	AddProperty(pTable);
}

void MP4ElstAtom::AddProperties(u_int8_t version) 
{
	MP4TableProperty* pTable = (MP4TableProperty*)m_pProperties[3];

	if (version == 1) {
		pTable->AddProperty(
			new MP4Integer64Property("segmentDuration"));
		pTable->AddProperty(
			new MP4Integer64Property("mediaTime"));
	} else {
		pTable->AddProperty(
			new MP4Integer32Property("segmentDuration"));
		pTable->AddProperty(
			new MP4Integer32Property("mediaTime"));
	}

	pTable->AddProperty(
		new MP4Integer16Property("mediaRate"));
	pTable->AddProperty(
		new MP4Integer16Property("reserved"));
}

void MP4ElstAtom::Generate() 
{
	SetVersion(0);
	AddProperties(GetVersion());

	MP4Atom::Generate();
}

void MP4ElstAtom::Read() 
{
	/* read atom version */
	ReadProperties(0, 1);

	/* need to create the properties based on the atom version */
	AddProperties(GetVersion());

	/* now we can read the remaining properties */
	ReadProperties(1);

	Skip();	// to end of atom
}