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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 | ||
26 | #include "libavcodec/avcodec.h" | |
27 | #include "avformat.h" | |
28 | #include "rtp.h" | |
29 | #include "url.h" | |
30 | #include "srtp.h" | |
31 | ||
32 | typedef struct PayloadContext PayloadContext; | |
33 | typedef struct RTPDynamicProtocolHandler RTPDynamicProtocolHandler; | |
34 | ||
35 | #define RTP_MIN_PACKET_LENGTH 12 | |
36 | #define RTP_MAX_PACKET_LENGTH 8192 | |
37 | ||
38 | #define RTP_REORDER_QUEUE_DEFAULT_SIZE 10 | |
39 | ||
40 | #define RTP_NOTS_VALUE ((uint32_t)-1) | |
41 | ||
42 | typedef struct RTPDemuxContext RTPDemuxContext; | |
43 | RTPDemuxContext *ff_rtp_parse_open(AVFormatContext *s1, AVStream *st, | |
44 | int payload_type, int queue_size); | |
45 | void ff_rtp_parse_set_dynamic_protocol(RTPDemuxContext *s, PayloadContext *ctx, | |
46 | RTPDynamicProtocolHandler *handler); | |
47 | void ff_rtp_parse_set_crypto(RTPDemuxContext *s, const char *suite, | |
48 | const char *params); | |
49 | int ff_rtp_parse_packet(RTPDemuxContext *s, AVPacket *pkt, | |
50 | uint8_t **buf, int len); | |
51 | void ff_rtp_parse_close(RTPDemuxContext *s); | |
52 | int64_t ff_rtp_queued_packet_time(RTPDemuxContext *s); | |
53 | void ff_rtp_reset_packet_queue(RTPDemuxContext *s); | |
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 | */ | |
66 | void ff_rtp_send_punch_packets(URLContext* rtp_handle); | |
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 | */ | |
73 | int ff_rtp_check_and_send_back_rr(RTPDemuxContext *s, URLContext *fd, | |
74 | AVIOContext *avio, int count); | |
75 | int ff_rtp_send_rtcp_feedback(RTPDemuxContext *s, URLContext *fd, | |
76 | AVIOContext *avio); | |
77 | ||
78 | // these statistics are used for rtcp receiver reports... | |
79 | typedef struct RTPStatistics { | |
80 | uint16_t max_seq; ///< highest sequence number seen | |
81 | uint32_t cycles; ///< shifted count of sequence number cycles | |
82 | uint32_t base_seq; ///< base sequence number | |
83 | uint32_t bad_seq; ///< last bad sequence number + 1 | |
84 | int probation; ///< sequence packets till source is valid | |
85 | uint32_t received; ///< packets received | |
86 | uint32_t expected_prior; ///< packets expected in last interval | |
87 | uint32_t received_prior; ///< packets received in last interval | |
88 | uint32_t transit; ///< relative transit time for previous packet | |
89 | uint32_t jitter; ///< estimated jitter. | |
90 | } RTPStatistics; | |
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 | */ | |
108 | typedef int (*DynamicPayloadPacketHandlerProc)(AVFormatContext *ctx, | |
109 | PayloadContext *s, | |
110 | AVStream *st, AVPacket *pkt, | |
111 | uint32_t *timestamp, | |
112 | const uint8_t * buf, | |
113 | int len, uint16_t seq, int flags); | |
114 | ||
115 | struct RTPDynamicProtocolHandler { | |
116 | const char enc_name[50]; | |
117 | enum AVMediaType codec_type; | |
118 | enum AVCodecID codec_id; | |
119 | int static_payload_id; /* 0 means no payload id is set. 0 is a valid | |
120 | * payload ID (PCMU), too, but that format doesn't | |
121 | * require any custom depacketization code. */ | |
122 | ||
123 | /** Initialize dynamic protocol handler, called after the full rtpmap line is parsed, may be null */ | |
124 | int (*init)(AVFormatContext *s, int st_index, PayloadContext *priv_data); | |
125 | /** Parse the a= line from the sdp field */ | |
126 | int (*parse_sdp_a_line)(AVFormatContext *s, int st_index, | |
127 | PayloadContext *priv_data, const char *line); | |
128 | /** Allocate any data needed by the rtp parsing for this dynamic data. */ | |
129 | PayloadContext *(*alloc)(void); | |
130 | /** Free any data needed by the rtp parsing for this dynamic data. */ | |
131 | void (*free)(PayloadContext *protocol_data); | |
132 | /** Parse handler for this dynamic packet */ | |
133 | DynamicPayloadPacketHandlerProc parse_packet; | |
134 | int (*need_keyframe)(PayloadContext *context); | |
135 | ||
136 | struct RTPDynamicProtocolHandler *next; | |
137 | }; | |
138 | ||
139 | typedef struct RTPPacket { | |
140 | uint16_t seq; | |
141 | uint8_t *buf; | |
142 | int len; | |
143 | int64_t recvtime; | |
144 | struct RTPPacket *next; | |
145 | } RTPPacket; | |
146 | ||
147 | struct RTPDemuxContext { | |
148 | AVFormatContext *ic; | |
149 | AVStream *st; | |
150 | int payload_type; | |
151 | uint32_t ssrc; | |
152 | uint16_t seq; | |
153 | uint32_t timestamp; | |
154 | uint32_t base_timestamp; | |
155 | uint32_t cur_timestamp; | |
156 | int64_t unwrapped_timestamp; | |
157 | int64_t range_start_offset; | |
158 | int max_payload_size; | |
159 | /* used to send back RTCP RR */ | |
160 | char hostname[256]; | |
161 | ||
162 | int srtp_enabled; | |
163 | struct SRTPContext srtp; | |
164 | ||
165 | /** Statistics for this stream (used by RTCP receiver reports) */ | |
166 | RTPStatistics statistics; | |
167 | ||
168 | /** Fields for packet reordering @{ */ | |
169 | int prev_ret; ///< The return value of the actual parsing of the previous packet | |
170 | RTPPacket* queue; ///< A sorted queue of buffered packets not yet returned | |
171 | int queue_len; ///< The number of packets in queue | |
172 | int queue_size; ///< The size of queue, or 0 if reordering is disabled | |
173 | /*@}*/ | |
174 | ||
175 | /* rtcp sender statistics receive */ | |
176 | uint64_t last_rtcp_ntp_time; | |
177 | int64_t last_rtcp_reception_time; | |
178 | uint64_t first_rtcp_ntp_time; | |
179 | uint32_t last_rtcp_timestamp; | |
180 | int64_t rtcp_ts_offset; | |
181 | ||
182 | /* rtcp sender statistics */ | |
183 | unsigned int packet_count; | |
184 | unsigned int octet_count; | |
185 | unsigned int last_octet_count; | |
186 | int64_t last_feedback_time; | |
187 | ||
188 | /* dynamic payload stuff */ | |
189 | const RTPDynamicProtocolHandler *handler; | |
190 | PayloadContext *dynamic_protocol_context; | |
191 | }; | |
192 | ||
193 | void ff_register_dynamic_payload_handler(RTPDynamicProtocolHandler *handler); | |
194 | RTPDynamicProtocolHandler *ff_rtp_handler_find_by_name(const char *name, | |
195 | enum AVMediaType codec_type); | |
196 | RTPDynamicProtocolHandler *ff_rtp_handler_find_by_id(int id, | |
197 | enum AVMediaType codec_type); | |
198 | ||
199 | /* from rtsp.c, but used by rtp dynamic protocol handlers. */ | |
200 | int ff_rtsp_next_attr_and_value(const char **p, char *attr, int attr_size, | |
201 | char *value, int value_size); | |
202 | ||
203 | int ff_parse_fmtp(AVFormatContext *s, | |
204 | AVStream *stream, PayloadContext *data, const char *p, | |
205 | int (*parse_fmtp)(AVFormatContext *s, | |
206 | AVStream *stream, | |
207 | PayloadContext *data, | |
208 | char *attr, char *value)); | |
209 | ||
210 | void ff_register_rtp_dynamic_payload_handlers(void); | |
211 | ||
212 | /** | |
213 | * Close the dynamic buffer and make a packet from it. | |
214 | */ | |
215 | int ff_rtp_finalize_packet(AVPacket *pkt, AVIOContext **dyn_buf, int stream_idx); | |
216 | ||
217 | #endif /* AVFORMAT_RTPDEC_H */ |