1 /*****************************************************************************
2 * rtp2250.h: Real-time Transport Protocol for MPEG-1/MPEG-2 audio/video
3 *****************************************************************************
4 * Copyright (C) 2016 VideoLAN
5 *
6 * Authors: Christophe Massiot <massiot@via.ecp.fr>
7 *
8 * Permission is hereby granted, free of charge, to any person obtaining
9 * a copy of this software and associated documentation files (the
10 * "Software"), to deal in the Software without restriction, including
11 * without limitation the rights to use, copy, modify, merge, publish,
12 * distribute, sublicense, and/or sell copies of the Software, and to
13 * permit persons to whom the Software is furnished to do so, subject
14 * to the following conditions:
15 *
16 * The above copyright notice and this permission notice shall be
17 * included in all copies or substantial portions of the Software.
18 *
19 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
20 * EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
21 * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.
22 * IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY
23 * CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT,
24 * TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE
25 * SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
26 *****************************************************************************/
27
28 /*
29 * Normative references:
30 * - IETF RFC 2250 RTP Payload Format for MPEG1/MPEG2 Video (January 1998)
31 */
32
33 #ifndef __BITSTREAM_IETF_RTP2250_H__
34 #define __BITSTREAM_IETF_RTP2250_H__
35
36 #include <stdint.h> /* uint8_t, uint16_t, etc... */
37 #include <stdbool.h> /* bool */
38
39 #include <bitstream/ietf/rtp.h>
40
41 #ifdef __cplusplus
42 extern "C"
43 {
44 #endif
45
46 /*
47 * Reminder : MPEG video-specific header
48 0 1 2 3
49 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
50 +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
51 | MBZ |T| TR | |N|S|B|E| P | | BFC | | FFC |
52 +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
53 AN FBV FFV
54 */
55
56 #define RTP2250V_HEADER_SIZE 4
57
rtp2250v_set_hdr(uint8_t * p_rtpv)58 static inline void rtp2250v_set_hdr(uint8_t *p_rtpv)
59 {
60 p_rtpv[0] = 0x0;
61 p_rtpv[1] = 0x0;
62 p_rtpv[2] = 0x0;
63 p_rtpv[3] = 0x0;
64 }
65
rtp2250v_check_hdr(const uint8_t * p_rtpv)66 static inline bool rtp2250v_check_hdr(const uint8_t *p_rtpv)
67 {
68 return (p_rtpv[0] & 0xf8) == 0x0;
69 }
70
rtp2250v_set_mpeg2(uint8_t * p_rtpv)71 static inline void rtp2250v_set_mpeg2(uint8_t *p_rtpv)
72 {
73 p_rtpv[0] |= 0x4;
74 }
75
rtp2250v_check_mpeg2(const uint8_t * p_rtpv)76 static inline bool rtp2250v_check_mpeg2(const uint8_t *p_rtpv)
77 {
78 return !!(p_rtpv[0] & 0x4);
79 }
80
81 /*
82 * Reminder : MPEG-2 video-specific header extension
83 0 1 2 3
84 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
85 +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
86 |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|
87 +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
88 */
89
90 #define RTP2250VX_HEADER_SIZE 4
91
rtp2250v_set_mpeg2_hdr(uint8_t * p_rtpv)92 static inline void rtp2250v_set_mpeg2_hdr(uint8_t *p_rtpv)
93 {
94 p_rtpv[4] = 0x0;
95 p_rtpv[5] = 0x0;
96 p_rtpv[6] = 0x0;
97 p_rtpv[7] = 0x0;
98 }
99
100 /*
101 * Reminder : MPEG Audio-specific header
102 0 1 2 3
103 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
104 +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
105 | MBZ | Frag_offset |
106 +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
107 */
108
109 #define RTP2250A_HEADER_SIZE 4
110
rtp2250a_set_hdr(uint8_t * p_rtpa)111 static inline void rtp2250a_set_hdr(uint8_t *p_rtpa)
112 {
113 p_rtpa[0] = 0x0;
114 p_rtpa[1] = 0x0;
115 p_rtpa[2] = 0x0;
116 p_rtpa[3] = 0x0;
117 }
118
rtp2250a_check_hdr(const uint8_t * p_rtpa)119 static inline bool rtp2250a_check_hdr(const uint8_t *p_rtpa)
120 {
121 return p_rtpa[0] == 0x0 && p_rtpa[1] == 0x0;
122 }
123
124 #ifdef __cplusplus
125 }
126 #endif
127
128 #endif
129