You can not select more than 25 topics
Topics must start with a letter or number, can include dashes ('-') and can be up to 35 characters long.
134 lines
4.1 KiB
134 lines
4.1 KiB
/*****************************************************************************
|
|
* rtp.h: Real-Time Protocol
|
|
*****************************************************************************
|
|
* Copyright (C) 2009 VideoLAN
|
|
* $Id$
|
|
*
|
|
* Authors: Christophe Massiot <massiot@via.ecp.fr>
|
|
*
|
|
* Permission is hereby granted, free of charge, to any person obtaining
|
|
* a copy of this software and associated documentation files (the
|
|
* "Software"), to deal in the Software without restriction, including
|
|
* without limitation the rights to use, copy, modify, merge, publish,
|
|
* distribute, sublicense, and/or sell copies of the Software, and to
|
|
* permit persons to whom the Software is furnished to do so, subject
|
|
* to the following conditions:
|
|
*
|
|
* The above copyright notice and this permission notice shall be
|
|
* included in all copies or substantial portions of the Software.
|
|
*
|
|
* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
|
|
* EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
|
|
* MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.
|
|
* IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY
|
|
* CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT,
|
|
* TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE
|
|
* SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
|
|
*****************************************************************************/
|
|
|
|
/*
|
|
* Normative references:
|
|
* - IETF RFC 3550 Real-Time Protocol (July 2003)
|
|
*/
|
|
|
|
#ifndef __BITSTREAM_IETF_RTP_H__
|
|
#define __BITSTREAM_IETF_RTP_H__
|
|
|
|
#ifdef __cplusplus
|
|
extern "C"
|
|
{
|
|
#endif
|
|
|
|
#define RTP_HEADER_SIZE 12
|
|
#define RTP_TYPE_TS 33
|
|
|
|
/*
|
|
* Reminder : RTP header
|
|
0 1 2 3
|
|
0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1
|
|
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
|
|
|V=2|P|X| CC |M| PT | sequence number |
|
|
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
|
|
| timestamp |
|
|
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
|
|
| synchronization source (SSRC) identifier |
|
|
+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+
|
|
| contributing source (CSRC) identifiers |
|
|
| .... |
|
|
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
|
|
*/
|
|
|
|
static inline void rtp_set_hdr(uint8_t *p_rtp)
|
|
{
|
|
p_rtp[0] = 0x80;
|
|
}
|
|
|
|
static inline bool rtp_check_hdr(const uint8_t *p_rtp)
|
|
{
|
|
return (p_rtp[0] & 0xc0) == 0x80;
|
|
}
|
|
|
|
static inline void rtp_set_type(uint8_t *p_rtp, uint8_t i_type)
|
|
{
|
|
p_rtp[1] = i_type;
|
|
}
|
|
|
|
static inline uint8_t rtp_get_type(const uint8_t *p_rtp)
|
|
{
|
|
return p_rtp[1] & 0x7f;
|
|
}
|
|
|
|
static inline void rtp_set_seqnum(uint8_t *p_rtp, uint16_t i_seqnum)
|
|
{
|
|
p_rtp[2] = i_seqnum >> 8;
|
|
p_rtp[3] = i_seqnum & 0xff;
|
|
}
|
|
|
|
static inline uint16_t rtp_get_seqnum(uint8_t *p_rtp)
|
|
{
|
|
return (p_rtp[2] << 8) | p_rtp[3];
|
|
}
|
|
|
|
static inline void rtp_set_timestamp(uint8_t *p_rtp, uint32_t i_timestamp)
|
|
{
|
|
p_rtp[4] = (i_timestamp >> 24) & 0xff;
|
|
p_rtp[5] = (i_timestamp >> 16) & 0xff;
|
|
p_rtp[6] = (i_timestamp >> 8) & 0xff;
|
|
p_rtp[7] = i_timestamp & 0xff;
|
|
}
|
|
|
|
static inline uint32_t rtp_get_timestamp(uint8_t *p_rtp)
|
|
{
|
|
return (p_rtp[4] << 24) | (p_rtp[5] << 16) | (p_rtp[6] << 8) | p_rtp[7];
|
|
}
|
|
|
|
static inline void rtp_set_ssrc(uint8_t *p_rtp, const uint8_t pi_ssrc[4])
|
|
{
|
|
p_rtp[8] = pi_ssrc[0];
|
|
p_rtp[9] = pi_ssrc[1];
|
|
p_rtp[10] = pi_ssrc[2];
|
|
p_rtp[11] = pi_ssrc[3];
|
|
}
|
|
|
|
static inline void rtp_get_ssrc(uint8_t *p_rtp, uint8_t pi_ssrc[4])
|
|
{
|
|
pi_ssrc[0] = p_rtp[8];
|
|
pi_ssrc[1] = p_rtp[9];
|
|
pi_ssrc[2] = p_rtp[10];
|
|
pi_ssrc[3] = p_rtp[11];
|
|
}
|
|
|
|
static inline uint8_t *rtp_payload(uint8_t *p_rtp)
|
|
{
|
|
unsigned int i_size = RTP_HEADER_SIZE;
|
|
i_size += 4 * (p_rtp[0] & 0xf);
|
|
if (p_rtp[0] & 0x10) /* header extension */
|
|
i_size += 4 * (1 + (p_rtp[i_size + 2] << 8) + p_rtp[i_size + 3]);
|
|
return p_rtp + i_size;
|
|
}
|
|
|
|
#ifdef __cplusplus
|
|
}
|
|
#endif
|
|
|
|
#endif
|