atom_tfhd.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"

MP4TfhdAtom::MP4TfhdAtom() 
	: MP4Atom("tfhd")
{
	AddVersionAndFlags();	/* 0, 1 */
	AddProperty( /* 2 */
		new MP4Integer32Property("trackId"));
}

void MP4TfhdAtom::AddProperties(u_int32_t flags)
{
	if (flags & 0x01) {
		// note this property is signed 64!
		AddProperty(
			new MP4Integer64Property("baseDataOffset"));
	}
	if (flags & 0x02) {
		AddProperty(
			new MP4Integer32Property("sampleDescriptionIndex"));
	}
	if (flags & 0x08) {
		AddProperty(
			new MP4Integer32Property("defaultSampleDuration"));
	}
	if (flags & 0x10) {
		AddProperty(
			new MP4Integer32Property("defaultSampleSize"));
	}
	if (flags & 0x20) {
		AddProperty(
			new MP4Integer32Property("defaultSampleFlags"));
	}
}

void MP4TfhdAtom::Read()
{
	/* read atom version, flags, and trackId */
	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
}