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
31
34
35 #define RTP_MIN_PACKET_LENGTH 12
36 #define RTP_MAX_PACKET_LENGTH 8192
37
38 #define RTP_REORDER_QUEUE_DEFAULT_SIZE 500
39
40 #define RTP_NOTS_VALUE ((uint32_t)-1)
41
48 const char *params);
54
55 /**
56 * Send a dummy packet on both port pairs to set up the connection
57 * state in potential NAT routers, so that we're able to receive
58 * packets.
59 *
60 * Note, this only works if the NAT router doesn't remap ports. This
61 * isn't a standardized procedure, but it works in many cases in practice.
62 *
63 * The same routine is used with RDT too, even if RDT doesn't use normal
64 * RTP packets otherwise.
65 */
67
68 /**
69 * some rtp servers assume client is dead if they don't hear from them...
70 * so we send a Receiver Report to the provided URLContext or AVIOContext
71 * (we don't have access to the rtcp handle from here)
72 */
77
78 // these statistics are used for rtcp receiver reports...
80 uint16_t
max_seq;
///< highest sequence number seen
81 uint32_t
cycles;
///< shifted count of sequence number cycles
83 uint32_t
bad_seq;
///< last bad sequence number + 1
84 int probation;
///< sequence packets till source is valid
88 uint32_t
transit;
///< relative transit time for previous packet
89 uint32_t
jitter;
///< estimated jitter.
91
92 #define RTP_FLAG_KEY 0x1 ///< RTP packet contains a keyframe
93 #define RTP_FLAG_MARKER 0x2
///< RTP marker bit was set for this packet
94 /**
95 * Packet parsing for "private" payloads in the RTP specs.
96 *
97 * @param ctx RTSP demuxer context
98 * @param s stream context
99 * @param st stream that this packet belongs to
100 * @param pkt packet in which to write the parsed data
101 * @param timestamp pointer to the RTP timestamp of the input data, can be
102 * updated by the function if returning older, buffered data
103 * @param buf pointer to raw RTP packet data
104 * @param len length of buf
105 * @param seq RTP sequence number of the packet
106 * @param flags flags from the RTP packet header (RTP_FLAG_*)
107 */
111 uint32_t *timestamp,
114
121 * payload ID (PCMU), too, but that format doesn't
122 * require any custom depacketization code. */
124
125 /** Initialize dynamic protocol handler, called after the full rtpmap line is parsed, may be null */
127 /** Parse the a= line from the sdp field */
130 /** Free any data needed by the rtp parsing for this dynamic data.
131 * Don't free the protocol_data pointer itself, that is freed by the
132 * caller. This is called even if the init method failed. */
134 /** Parse handler for this dynamic packet */
137 };
138
146
158 /* used to send back RTCP RR */
160
163
164 /** Statistics for this stream (used by RTCP receiver reports) */
166
167 /** Fields for packet reordering @{ */
168 int prev_ret;
///< The return value of the actual parsing of the previous packet
171 int queue_size;
///< The size of queue, or 0 if reordering is disabled
172 /*@}*/
173
174 /* rtcp sender statistics receive */
180
181 /* rtcp sender statistics */
186
187 /* dynamic payload stuff */
190 };
191
192 /**
193 * Iterate over all registered rtp dynamic protocol handlers.
194 *
195 * @param opaque a pointer where libavformat will store the iteration state. Must
196 * point to NULL to start the iteration.
197 *
198 * @return the next registered rtp dynamic protocol handler or NULL when the iteration is
199 * finished
200 */
202 /**
203 * Find a registered rtp dynamic protocol handler with the specified name.
204 *
205 * @param name name of the requested rtp dynamic protocol handler
206 * @return A rtp dynamic protocol handler if one was found, NULL otherwise.
207 */
210 /**
211 * Find a registered rtp dynamic protocol handler with a matching codec ID.
212 *
213 * @param id AVCodecID of the requested rtp dynamic protocol handler.
214 * @return A rtp dynamic protocol handler if one was found, NULL otherwise.
215 */
218
219 /* from rtsp.c, but used by rtp dynamic protocol handlers. */
221 char *
value,
int value_size);
222
228 const char *attr,
const char *
value));
229
230 /**
231 * Close the dynamic buffer and make a packet from it.
232 */
234
235 #endif /* AVFORMAT_RTPDEC_H */