19996fadd42c5d24430de3595dcef5a5fe2711af
[libav.git] / libavformat / rtpdec.h
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 #ifndef AVFORMAT_RTPDEC_H
23 #define AVFORMAT_RTPDEC_H
24
25 #include "libavcodec/avcodec.h"
26 #include "avformat.h"
27 #include "rtp.h"
28
29 /** Structure listing useful vars to parse RTP packet payload*/
30 typedef struct rtp_payload_data
31 {
32 int sizelength;
33 int indexlength;
34 int indexdeltalength;
35 int profile_level_id;
36 int streamtype;
37 int objecttype;
38 char *mode;
39
40 /** mpeg 4 AU headers */
41 struct AUHeaders {
42 int size;
43 int index;
44 int cts_flag;
45 int cts;
46 int dts_flag;
47 int dts;
48 int rap_flag;
49 int streamstate;
50 } *au_headers;
51 int au_headers_allocated;
52 int nb_au_headers;
53 int au_headers_length_bytes;
54 int cur_au_index;
55 } RTPPayloadData;
56
57 typedef struct PayloadContext PayloadContext;
58 typedef struct RTPDynamicProtocolHandler_s RTPDynamicProtocolHandler;
59
60 #define RTP_MIN_PACKET_LENGTH 12
61 #define RTP_MAX_PACKET_LENGTH 1500 /* XXX: suppress this define */
62
63 typedef struct RTPDemuxContext RTPDemuxContext;
64 RTPDemuxContext *rtp_parse_open(AVFormatContext *s1, AVStream *st, URLContext *rtpc, int payload_type, RTPPayloadData *rtp_payload_data);
65 void rtp_parse_set_dynamic_protocol(RTPDemuxContext *s, PayloadContext *ctx,
66 RTPDynamicProtocolHandler *handler);
67 int rtp_parse_packet(RTPDemuxContext *s, AVPacket *pkt,
68 const uint8_t *buf, int len);
69 void rtp_parse_close(RTPDemuxContext *s);
70
71 int rtp_get_local_port(URLContext *h);
72 int rtp_set_remote_url(URLContext *h, const char *uri);
73 #if (LIBAVFORMAT_VERSION_MAJOR <= 52)
74 void rtp_get_file_handles(URLContext *h, int *prtp_fd, int *prtcp_fd);
75 #endif
76
77 /**
78 * Send a dummy packet on both port pairs to set up the connection
79 * state in potential NAT routers, so that we're able to receive
80 * packets.
81 *
82 * Note, this only works if the NAT router doesn't remap ports. This
83 * isn't a standardized procedure, but it works in many cases in practice.
84 *
85 * The same routine is used with RDT too, even if RDT doesn't use normal
86 * RTP packets otherwise.
87 */
88 void rtp_send_punch_packets(URLContext* rtp_handle);
89
90 /**
91 * some rtp servers assume client is dead if they don't hear from them...
92 * so we send a Receiver Report to the provided ByteIO context
93 * (we don't have access to the rtcp handle from here)
94 */
95 int rtp_check_and_send_back_rr(RTPDemuxContext *s, int count);
96
97 // these statistics are used for rtcp receiver reports...
98 typedef struct {
99 uint16_t max_seq; ///< highest sequence number seen
100 uint32_t cycles; ///< shifted count of sequence number cycles
101 uint32_t base_seq; ///< base sequence number
102 uint32_t bad_seq; ///< last bad sequence number + 1
103 int probation; ///< sequence packets till source is valid
104 int received; ///< packets received
105 int expected_prior; ///< packets expected in last interval
106 int received_prior; ///< packets received in last interval
107 uint32_t transit; ///< relative transit time for previous packet
108 uint32_t jitter; ///< estimated jitter.
109 } RTPStatistics;
110
111 #define RTP_FLAG_KEY 0x1 ///< RTP packet contains a keyframe
112 #define RTP_FLAG_MARKER 0x2 ///< RTP marker bit was set for this packet
113 /**
114 * Packet parsing for "private" payloads in the RTP specs.
115 *
116 * @param ctx RTSP demuxer context
117 * @param s stream context
118 * @param st stream that this packet belongs to
119 * @param pkt packet in which to write the parsed data
120 * @param timestamp pointer in which to write the timestamp of this RTP packet
121 * @param buf pointer to raw RTP packet data
122 * @param len length of buf
123 * @param flags flags from the RTP packet header (RTP_FLAG_*)
124 */
125 typedef int (*DynamicPayloadPacketHandlerProc) (AVFormatContext *ctx,
126 PayloadContext *s,
127 AVStream *st,
128 AVPacket * pkt,
129 uint32_t *timestamp,
130 const uint8_t * buf,
131 int len, int flags);
132
133 struct RTPDynamicProtocolHandler_s {
134 // fields from AVRtpDynamicPayloadType_s
135 const char enc_name[50]; /* XXX: still why 50 ? ;-) */
136 enum AVMediaType codec_type;
137 enum CodecID codec_id;
138
139 // may be null
140 int (*parse_sdp_a_line) (AVFormatContext *s,
141 int st_index,
142 PayloadContext *priv_data,
143 const char *line); ///< Parse the a= line from the sdp field
144 PayloadContext *(*open) (void); ///< allocate any data needed by the rtp parsing for this dynamic data.
145 void (*close)(PayloadContext *protocol_data); ///< free any data needed by the rtp parsing for this dynamic data.
146 DynamicPayloadPacketHandlerProc parse_packet; ///< parse handler for this dynamic packet.
147
148 struct RTPDynamicProtocolHandler_s *next;
149 };
150
151 // moved out of rtp.c, because the h264 decoder needs to know about this structure..
152 struct RTPDemuxContext {
153 AVFormatContext *ic;
154 AVStream *st;
155 int payload_type;
156 uint32_t ssrc;
157 uint16_t seq;
158 uint32_t timestamp;
159 uint32_t base_timestamp;
160 uint32_t cur_timestamp;
161 int max_payload_size;
162 struct MpegTSContext *ts; /* only used for MP2T payloads */
163 int read_buf_index;
164 int read_buf_size;
165 /* used to send back RTCP RR */
166 URLContext *rtp_ctx;
167 char hostname[256];
168
169 RTPStatistics statistics; ///< Statistics for this stream (used by RTCP receiver reports)
170
171 /* rtcp sender statistics receive */
172 int64_t last_rtcp_ntp_time; // TODO: move into statistics
173 uint32_t last_rtcp_timestamp; // TODO: move into statistics
174
175 /* rtcp sender statistics */
176 unsigned int packet_count; // TODO: move into statistics (outgoing)
177 unsigned int octet_count; // TODO: move into statistics (outgoing)
178 unsigned int last_octet_count; // TODO: move into statistics (outgoing)
179 int first_packet;
180 /* buffer for output */
181 uint8_t buf[RTP_MAX_PACKET_LENGTH];
182 uint8_t *buf_ptr;
183
184 /* special infos for au headers parsing */
185 RTPPayloadData *rtp_payload_data; // TODO: Move into dynamic payload handlers
186
187 /* dynamic payload stuff */
188 DynamicPayloadPacketHandlerProc parse_packet; ///< This is also copied from the dynamic protocol handler structure
189 PayloadContext *dynamic_protocol_context; ///< This is a copy from the values setup from the sdp parsing, in rtsp.c don't free me.
190 int max_frames_per_packet;
191 };
192
193 extern RTPDynamicProtocolHandler *RTPFirstDynamicPayloadHandler;
194 void ff_register_dynamic_payload_handler(RTPDynamicProtocolHandler *handler);
195
196 int ff_rtsp_next_attr_and_value(const char **p, char *attr, int attr_size, char *value, int value_size); ///< from rtsp.c, but used by rtp dynamic protocol handlers.
197
198 void av_register_rtp_dynamic_payload_handlers(void);
199
200 #endif /* AVFORMAT_RTPDEC_H */