1 /*
2 * RTP demuxer definitions
3 * Copyright (c) 2002 Fabrice Bellard
4 * Copyright (c) 2006 Ryan Martell <rdm4@martellventures.com>
5 *
6 * This file is part of FFmpeg.
7 *
8 * FFmpeg is free software; you can redistribute it and/or
9 * modify it under the terms of the GNU Lesser General Public
10 * License as published by the Free Software Foundation; either
11 * version 2.1 of the License, or (at your option) any later version.
12 *
13 * FFmpeg is distributed in the hope that it will be useful,
14 * but WITHOUT ANY WARRANTY; without even the implied warranty of
15 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
16 * Lesser General Public License for more details.
17 *
18 * You should have received a copy of the GNU Lesser General Public
19 * License along with FFmpeg; if not, write to the Free Software
20 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
21 */
22
23 #ifndef AVFORMAT_RTPDEC_H
24 #define AVFORMAT_RTPDEC_H
25
32
35
36 #define RTP_MIN_PACKET_LENGTH 12
37 #define RTP_MAX_PACKET_LENGTH 8192
38
39 #define RTP_REORDER_QUEUE_DEFAULT_SIZE 500
40
41 #define RTP_NOTS_VALUE ((uint32_t)-1)
42
49 const char *params);
51 uint8_t **buf,
int len);
55
56 /**
57 * Send a dummy packet on both port pairs to set up the connection
58 * state in potential NAT routers, so that we're able to receive
59 * packets.
60 *
61 * Note, this only works if the NAT router doesn't remap ports. This
62 * isn't a standardized procedure, but it works in many cases in practice.
63 *
64 * The same routine is used with RDT too, even if RDT doesn't use normal
65 * RTP packets otherwise.
66 */
68
69 /**
70 * some rtp servers assume client is dead if they don't hear from them...
71 * so we send a Receiver Report to the provided URLContext or AVIOContext
72 * (we don't have access to the rtcp handle from here)
73 */
78
79 // these statistics are used for rtcp receiver reports...
81 uint16_t
max_seq;
///< highest sequence number seen
82 uint32_t
cycles;
///< shifted count of sequence number cycles
84 uint32_t
bad_seq;
///< last bad sequence number + 1
85 int probation;
///< sequence packets till source is valid
89 uint32_t
transit;
///< relative transit time for previous packet
90 uint32_t
jitter;
///< estimated jitter.
92
93 #define RTP_FLAG_KEY 0x1 ///< RTP packet contains a keyframe
94 #define RTP_FLAG_MARKER 0x2
///< RTP marker bit was set for this packet
95 /**
96 * Packet parsing for "private" payloads in the RTP specs.
97 *
98 * @param ctx RTSP demuxer context
99 * @param s stream context
100 * @param st stream that this packet belongs to
101 * @param pkt packet in which to write the parsed data
102 * @param timestamp pointer to the RTP timestamp of the input data, can be
103 * updated by the function if returning older, buffered data
104 * @param buf pointer to raw RTP packet data
105 * @param len length of buf
106 * @param seq RTP sequence number of the packet
107 * @param flags flags from the RTP packet header (RTP_FLAG_*)
108 */
112 uint32_t *timestamp,
113 const uint8_t * buf,
115
122 * payload ID (PCMU), too, but that format doesn't
123 * require any custom depacketization code. */
125
126 /** Initialize dynamic protocol handler, called after the full rtpmap line is parsed, may be null */
128 /** Parse the a= line from the sdp field */
131 /** Free any data needed by the rtp parsing for this dynamic data.
132 * Don't free the protocol_data pointer itself, that is freed by the
133 * caller. This is called even if the init method failed. */
135 /** Parse handler for this dynamic packet */
138 };
139
147
159 /* used to send back RTCP RR */
161
164
165 /** Statistics for this stream (used by RTCP receiver reports) */
167
168 /** Fields for packet reordering @{ */
169 int prev_ret;
///< The return value of the actual parsing of the previous packet
172 int queue_size;
///< The size of queue, or 0 if reordering is disabled
173 /*@}*/
174
175 /* rtcp sender statistics receive */
181
182 /* rtcp sender statistics */
187
188 /* dynamic payload stuff */
191 };
192
193 /**
194 * Find a registered rtp dynamic protocol handler with the specified name.
195 *
196 * @param name name of the requested rtp dynamic protocol handler
197 * @return A rtp dynamic protocol handler if one was found, NULL otherwise.
198 */
201 /**
202 * Find a registered rtp dynamic protocol handler with a matching codec ID.
203 *
204 * @param id AVCodecID of the requested rtp dynamic protocol handler.
205 * @return A rtp dynamic protocol handler if one was found, NULL otherwise.
206 */
209
210 /* from rtsp.c, but used by rtp dynamic protocol handlers. */
212 char *
value,
int value_size);
213
219 const char *attr,
const char *
value));
220
221 /**
222 * Close the dynamic buffer and make a packet from it.
223 */
225
226 #endif /* AVFORMAT_RTPDEC_H */