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234 lines
6.3 KiB
234 lines
6.3 KiB
/*****************************************************************************
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* rtp.h: Real-time Transport Protocol
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*****************************************************************************
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* Copyright (C) 2009, 2014 VideoLAN
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*
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* Authors: Christophe Massiot <massiot@via.ecp.fr>
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*
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* Permission is hereby granted, free of charge, to any person obtaining
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* a copy of this software and associated documentation files (the
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* "Software"), to deal in the Software without restriction, including
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* without limitation the rights to use, copy, modify, merge, publish,
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* distribute, sublicense, and/or sell copies of the Software, and to
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* permit persons to whom the Software is furnished to do so, subject
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* to the following conditions:
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*
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* The above copyright notice and this permission notice shall be
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* included in all copies or substantial portions of the Software.
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*
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* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
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* EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
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* MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.
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* IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY
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* CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT,
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* TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE
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* SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
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*****************************************************************************/
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/*
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* Normative references:
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* - IETF RFC 3550 Real-Time Protocol (July 2003)
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*/
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#ifndef __BITSTREAM_IETF_RTP_H__
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#define __BITSTREAM_IETF_RTP_H__
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#include <stdlib.h>
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#include <stdint.h> /* uint8_t, uint16_t, etc... */
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#include <stdbool.h> /* bool */
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#ifdef __cplusplus
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extern "C"
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{
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#endif
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#define RTP_HEADER_SIZE 12
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#define RTP_EXTENSION_SIZE 4
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#define RTP_TYPE_TS 33
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/*
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* Reminder : RTP header
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0 1 2 3
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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
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+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
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|V=2|P|X| CC |M| PT | sequence number |
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+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
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| timestamp |
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+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
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| synchronization source (SSRC) identifier |
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+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+
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| contributing source (CSRC) identifiers |
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| .... |
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+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
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*/
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static inline void rtp_set_hdr(uint8_t *p_rtp)
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{
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p_rtp[0] = 0x80;
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}
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static inline bool rtp_check_hdr(const uint8_t *p_rtp)
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{
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return (p_rtp[0] & 0xc0) == 0x80;
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}
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static inline void rtp_set_padding(uint8_t *p_rtp)
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{
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p_rtp[0] |= 0x20;
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}
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static inline bool rtp_check_padding(const uint8_t *p_rtp)
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{
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return !!(p_rtp[0] & 0x20);
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}
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static inline void rtp_set_extension(uint8_t *p_rtp)
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{
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p_rtp[0] |= 0x10;
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}
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static inline bool rtp_check_extension(const uint8_t *p_rtp)
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{
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return !!(p_rtp[0] & 0x10);
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}
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static inline void rtp_set_cc(uint8_t *p_rtp, uint8_t i_cc)
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{
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p_rtp[0] &= 0xf0;
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p_rtp[0] |= i_cc & 0xf;
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}
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static inline uint8_t rtp_get_cc(const uint8_t *p_rtp)
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{
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return p_rtp[0] & 0xf;
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}
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static inline void rtp_set_marker(uint8_t *p_rtp)
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{
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p_rtp[1] |= 0x80;
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}
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static inline void rtp_clear_marker(uint8_t *p_rtp)
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{
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p_rtp[1] &= ~0x80;
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}
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static inline bool rtp_check_marker(const uint8_t *p_rtp)
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{
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return !!(p_rtp[1] & 0x80);
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}
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static inline void rtp_set_type(uint8_t *p_rtp, uint8_t i_type)
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{
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p_rtp[1] = i_type & 0x7f;
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}
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static inline uint8_t rtp_get_type(const uint8_t *p_rtp)
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{
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return p_rtp[1] & 0x7f;
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}
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static inline void rtp_set_seqnum(uint8_t *p_rtp, uint16_t i_seqnum)
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{
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p_rtp[2] = i_seqnum >> 8;
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p_rtp[3] = i_seqnum & 0xff;
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}
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static inline uint16_t rtp_get_seqnum(const uint8_t *p_rtp)
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{
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return (p_rtp[2] << 8) | p_rtp[3];
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}
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static inline void rtp_set_timestamp(uint8_t *p_rtp, uint32_t i_timestamp)
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{
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p_rtp[4] = (i_timestamp >> 24) & 0xff;
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p_rtp[5] = (i_timestamp >> 16) & 0xff;
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p_rtp[6] = (i_timestamp >> 8) & 0xff;
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p_rtp[7] = i_timestamp & 0xff;
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}
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static inline uint32_t rtp_get_timestamp(const uint8_t *p_rtp)
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{
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return (p_rtp[4] << 24) | (p_rtp[5] << 16) | (p_rtp[6] << 8) | p_rtp[7];
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}
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static inline void rtp_set_ssrc(uint8_t *p_rtp, const uint8_t pi_ssrc[4])
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{
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p_rtp[8] = pi_ssrc[0];
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p_rtp[9] = pi_ssrc[1];
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p_rtp[10] = pi_ssrc[2];
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p_rtp[11] = pi_ssrc[3];
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}
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static inline void rtp_get_ssrc(const uint8_t *p_rtp, uint8_t pi_ssrc[4])
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{
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pi_ssrc[0] = p_rtp[8];
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pi_ssrc[1] = p_rtp[9];
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pi_ssrc[2] = p_rtp[10];
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pi_ssrc[3] = p_rtp[11];
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}
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static inline void rtp_set_int_ssrc(uint8_t *p_rtp, uint32_t i_ssrc)
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{
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p_rtp[8] = (i_ssrc >> 24) & 0xff;
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p_rtp[9] = (i_ssrc >> 16) & 0xff;
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p_rtp[10] = (i_ssrc >> 8) & 0xff;
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p_rtp[11] = i_ssrc & 0xff;
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}
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static inline uint32_t rtp_get_int_ssrc(const uint8_t *p_rtp)
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{
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return (p_rtp[8] << 24) | (p_rtp[9] << 16) | (p_rtp[10] << 8) | p_rtp[11];
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}
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static inline uint8_t *rtp_extension(uint8_t *p_rtp)
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{
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return p_rtp + RTP_HEADER_SIZE + 4 * rtp_get_cc(p_rtp);
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}
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static inline void rtpx_set_header(uint8_t *p_rtpx, uint16_t i_header)
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{
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p_rtpx[0] = (i_header >> 8) & 0xff;
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p_rtpx[1] = i_header & 0xff;
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}
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static inline uint16_t rtpx_get_header(const uint8_t *p_rtpx)
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{
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return (p_rtpx[0] << 8) | p_rtpx[1];
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}
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static inline void rtpx_set_length(uint8_t *p_rtpx, uint16_t i_length)
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{
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p_rtpx[2] = (i_length >> 8) & 0xff;
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p_rtpx[3] = i_length & 0xff;
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}
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static inline uint16_t rtpx_get_length(const uint8_t *p_rtpx)
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{
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return (p_rtpx[2] << 8) | p_rtpx[3];
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}
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static inline uint8_t *rtp_payload(uint8_t *p_rtp)
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{
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unsigned int i_size = RTP_HEADER_SIZE;
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i_size += 4 * rtp_get_cc(p_rtp);
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if (rtp_check_extension(p_rtp))
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i_size += 4 * (1 + rtpx_get_length(rtp_extension(p_rtp)));
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return p_rtp + i_size;
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}
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static inline size_t rtp_payload_size(uint8_t *p_rtp, size_t i_rtp_size)
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{
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size_t i_payload_size = i_rtp_size - (rtp_payload(p_rtp) - p_rtp);
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uint8_t i_padding_size = 0;
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if (rtp_check_padding(p_rtp))
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i_padding_size = p_rtp[i_rtp_size - 1];
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return i_payload_size - i_padding_size;
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}
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#ifdef __cplusplus
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}
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#endif
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#endif
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