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/**
* @file vidutil.c Video utility functions
*
* Copyright (C) 2017 Creytiv.com
*/
#include <re.h>
#include <rem.h>
#include <baresip.h>
#include "core.h"
/**
* Calculate the RTP timestamp from Presentation Time Stamp (PTS)
* or Decoding Time Stamp (DTS) and framerate.
*
* @note The calculated RTP Timestamp may wrap around.
*
* @param pts Presentation Time Stamp (PTS)
* @param fps Framerate in [frames per second]
*
* @return RTP Timestamp
*/
uint32_t video_calc_rtp_timestamp(int64_t pts, unsigned fps)
{
uint64_t rtp_ts;
if (!fps)
return 0;
rtp_ts = ((uint64_t)VIDEO_SRATE * pts) / fps;
return (uint32_t)rtp_ts;
}
/**
* Calculate the timestamp in seconds from the RTP timestamp.
*
* @param rtp_ts RTP Timestamp
*
* @return Timestamp in seconds
*/
double video_calc_seconds(uint32_t rtp_ts)
{
double timestamp;
/* convert from RTP clockrate to seconds */
timestamp = (double)rtp_ts / (double)VIDEO_SRATE;
return timestamp;
}
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