atom_d263.cpp

完整的RTP RTSP代码库

/*
 * 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.
 *
 * 3GPP features implementation is based on 3GPP's TS26.234-v5.60,
 * and was contributed by Ximpo Group Ltd.
 *
 * Portions created by Ximpo Group Ltd. are
 * Copyright (C) Ximpo Group Ltd. 2003, 2004.  All Rights Reserved.
 *
 * Contributor(s):
 *              Ximpo Group Ltd.          [e-mail]
 */

#include "mp4common.h"

#define H263_VENDOR 0x6d346970

MP4D263Atom::MP4D263Atom() 
	: MP4Atom("d263") 
{
	AddProperty( /* 0 */
		new MP4Integer32Property("vendor"));

	AddProperty( /* 1 */
		new MP4Integer8Property("decoderVersion"));

	AddProperty( /* 2 */
		new MP4Integer8Property("h263Level"));

	AddProperty( /* 3 */
		new MP4Integer8Property("h263Profile"));

	ExpectChildAtom("bitr", Optional, OnlyOne);

}

void MP4D263Atom::Generate()
{
	MP4Atom::Generate();

       ((MP4Integer32Property*)m_pProperties[0])->SetValue(H263_VENDOR);
       ((MP4Integer8Property*)m_pProperties[1])->SetValue(1);

}

void MP4D263Atom::Write()
{
	// Check whether we have valid values in the bitr atom
	// (if it exists, of course)
	MP4Atom* bitrAtom = FindAtom("d263.bitr");
	if (bitrAtom) {
		u_int32_t avgBitrate;
		u_int32_t maxBitrate;

		MP4Integer32Property* pProp;
		bitrAtom->FindProperty("bitr.avgBitrate",
			(MP4Property**)&pProp,
			NULL);
		ASSERT(pProp);
		avgBitrate = pProp->GetValue();

		bitrAtom->FindProperty("bitr.maxBitrate",
			(MP4Property**)&pProp,
			NULL);
		ASSERT(pProp);
		maxBitrate = pProp->GetValue();

		if(!maxBitrate && !avgBitrate) {
			DeleteChildAtom(bitrAtom);
		}
	}

	MP4Atom::Write();
}