media_time.h

MPEG-4编解码的实现(包括MPEG4视音频编解码)

/*
 * 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. 2000, 2001.  All Rights Reserved.
 * 
 * Contributor(s): 
 *		Dave Mackie		[e-mail]
 *		Bill May 		[e-mail]
 */

#ifndef __MEDIA_TIME_H__
#define __MEDIA_TIME_H__

#include <sys/types.h>
#include <time.h>
#include <sys/time.h>

typedef u_int64_t Timestamp;
const u_int64_t TimestampTicks = 1000000;
typedef int64_t Duration;

inline Timestamp GetTimestampFromTimeval(struct timeval* pTimeval) {
	return ((u_int64_t)pTimeval->tv_sec * TimestampTicks) + pTimeval->tv_usec;
}

inline Timestamp GetTimestamp(void) {
	struct timeval tv;
	gettimeofday(&tv, NULL);
	return GetTimestampFromTimeval(&tv);
}

inline u_int32_t GetSecsFromTimestamp(Timestamp t) {
	return t / TimestampTicks;
}

#endif /* __MEDIA_TIME_H__ */