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128 lines
3.9 KiB
128 lines
3.9 KiB
/*****************************************************************************
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* rtp2250.h: Real-time Transport Protocol for MPEG-1/MPEG-2 audio/video
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*****************************************************************************
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* Copyright (C) 2016 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 2250 RTP Payload Format for MPEG1/MPEG2 Video (January 1998)
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*/
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#ifndef __BITSTREAM_IETF_RTP2250_H__
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#define __BITSTREAM_IETF_RTP2250_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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#include <bitstream/ietf/rtp.h>
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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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/*
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* Reminder : MPEG video-specific 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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| MBZ |T| TR | |N|S|B|E| P | | BFC | | FFC |
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+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
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AN FBV FFV
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*/
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#define RTP2250V_HEADER_SIZE 4
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static inline void rtp2250v_set_hdr(uint8_t *p_rtpv)
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{
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p_rtpv[0] = 0x0;
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p_rtpv[1] = 0x0;
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p_rtpv[2] = 0x0;
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p_rtpv[3] = 0x0;
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}
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static inline bool rtp2250v_check_hdr(const uint8_t *p_rtpv)
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{
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return (p_rtpv[0] & 0xf8) == 0x0;
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}
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static inline void rtp2250v_set_mpeg2(uint8_t *p_rtpv)
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{
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p_rtpv[0] |= 0x4;
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}
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static inline bool rtp2250v_check_mpeg2(const uint8_t *p_rtpv)
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{
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return !!(p_rtpv[0] & 0x4);
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}
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/*
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* Reminder : MPEG-2 video-specific header extension
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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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|X|E|f_[0,0]|f_[0,1]|f_[1,0]|f_[1,1]| DC| PS|T|P|C|Q|V|A|R|H|G|D|
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+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
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*/
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#define RTP2250VX_HEADER_SIZE 4
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static inline void rtp2250v_set_mpeg2_hdr(uint8_t *p_rtpv)
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{
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p_rtpv[4] = 0x0;
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p_rtpv[5] = 0x0;
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p_rtpv[6] = 0x0;
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p_rtpv[7] = 0x0;
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}
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/*
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* Reminder : MPEG Audio-specific 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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| MBZ | Frag_offset |
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+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
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*/
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#define RTP2250A_HEADER_SIZE 4
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static inline void rtp2250a_set_hdr(uint8_t *p_rtpa)
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{
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p_rtpa[0] = 0x0;
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p_rtpa[1] = 0x0;
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p_rtpa[2] = 0x0;
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p_rtpa[3] = 0x0;
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}
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static inline bool rtp2250a_check_hdr(const uint8_t *p_rtpa)
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{
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return p_rtpa[0] == 0x0 && p_rtpa[1] == 0x0;
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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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