Add void to a function prototype that takes no arguments. Fixes a potential
[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 nb_au_headers;
52 int au_headers_length_bytes;
53 int cur_au_index;
54 } RTPPayloadData;
55
56 typedef struct PayloadContext PayloadContext;
57 typedef struct RTPDynamicProtocolHandler_s RTPDynamicProtocolHandler;
58
59 #define RTP_MIN_PACKET_LENGTH 12
60 #define RTP_MAX_PACKET_LENGTH 1500 /* XXX: suppress this define */
61
62 typedef struct RTPDemuxContext RTPDemuxContext;
63 RTPDemuxContext *rtp_parse_open(AVFormatContext *s1, AVStream *st, URLContext *rtpc, int payload_type, RTPPayloadData *rtp_payload_data);
64 void rtp_parse_set_dynamic_protocol(RTPDemuxContext *s, PayloadContext *ctx,
65 RTPDynamicProtocolHandler *handler);
66 int rtp_parse_packet(RTPDemuxContext *s, AVPacket *pkt,
67 const uint8_t *buf, int len);
68 void rtp_parse_close(RTPDemuxContext *s);
69
70 int rtp_get_local_port(URLContext *h);
71 int rtp_set_remote_url(URLContext *h, const char *uri);
72 #if (LIBAVFORMAT_VERSION_MAJOR <= 52)
73 void rtp_get_file_handles(URLContext *h, int *prtp_fd, int *prtcp_fd);
74 #endif
75
76 /**
77 * Send a dummy packet on both port pairs to set up the connection
78 * state in potential NAT routers, so that we're able to receive
79 * packets.
80 *
81 * Note, this only works if the NAT router doesn't remap ports. This
82 * isn't a standardized procedure, but it works in many cases in practice.
83 *
84 * The same routine is used with RDT too, even if RDT doesn't use normal
85 * RTP packets otherwise.
86 */
87 void rtp_send_punch_packets(URLContext* rtp_handle);
88
89 /**
90 * some rtp servers assume client is dead if they don't hear from them...
91 * so we send a Receiver Report to the provided ByteIO context
92 * (we don't have access to the rtcp handle from here)
93 */
94 int rtp_check_and_send_back_rr(RTPDemuxContext *s, int count);
95
96 // these statistics are used for rtcp receiver reports...
97 typedef struct {
98 uint16_t max_seq; ///< highest sequence number seen
99 uint32_t cycles; ///< shifted count of sequence number cycles
100 uint32_t base_seq; ///< base sequence number
101 uint32_t bad_seq; ///< last bad sequence number + 1
102 int probation; ///< sequence packets till source is valid
103 int received; ///< packets received
104 int expected_prior; ///< packets expected in last interval
105 int received_prior; ///< packets received in last interval
106 uint32_t transit; ///< relative transit time for previous packet
107 uint32_t jitter; ///< estimated jitter.
108 } RTPStatistics;
109
110 #define RTP_FLAG_KEY 0x1 ///< RTP packet contains a keyframe
111 #define RTP_FLAG_MARKER 0x2 ///< RTP marker bit was set for this packet
112 /**
113 * Packet parsing for "private" payloads in the RTP specs.
114 *
115 * @param ctx RTSP demuxer context
116 * @param s stream context
117 * @param st stream that this packet belongs to
118 * @param pkt packet in which to write the parsed data
119 * @param timestamp pointer in which to write the timestamp of this RTP packet
120 * @param buf pointer to raw RTP packet data
121 * @param len length of buf
122 * @param flags flags from the RTP packet header (RTP_FLAG_*)
123 */
124 typedef int (*DynamicPayloadPacketHandlerProc) (AVFormatContext *ctx,
125 PayloadContext *s,
126 AVStream *st,
127 AVPacket * pkt,
128 uint32_t *timestamp,
129 const uint8_t * buf,
130 int len, int flags);
131
132 struct RTPDynamicProtocolHandler_s {
133 // fields from AVRtpDynamicPayloadType_s
134 const char enc_name[50]; /* XXX: still why 50 ? ;-) */
135 enum AVMediaType codec_type;
136 enum CodecID codec_id;
137
138 // may be null
139 int (*parse_sdp_a_line) (AVFormatContext *s,
140 int st_index,
141 PayloadContext *priv_data,
142 const char *line); ///< Parse the a= line from the sdp field
143 PayloadContext *(*open) (void); ///< allocate any data needed by the rtp parsing for this dynamic data.
144 void (*close)(PayloadContext *protocol_data); ///< free any data needed by the rtp parsing for this dynamic data.
145 DynamicPayloadPacketHandlerProc parse_packet; ///< parse handler for this dynamic packet.
146
147 struct RTPDynamicProtocolHandler_s *next;
148 };
149
150 // moved out of rtp.c, because the h264 decoder needs to know about this structure..
151 struct RTPDemuxContext {
152 AVFormatContext *ic;
153 AVStream *st;
154 int payload_type;
155 uint32_t ssrc;
156 uint16_t seq;
157 uint32_t timestamp;
158 uint32_t base_timestamp;
159 uint32_t cur_timestamp;
160 int max_payload_size;
161 struct MpegTSContext *ts; /* only used for MP2T payloads */
162 int read_buf_index;
163 int read_buf_size;
164 /* used to send back RTCP RR */
165 URLContext *rtp_ctx;
166 char hostname[256];
167
168 RTPStatistics statistics; ///< Statistics for this stream (used by RTCP receiver reports)
169
170 /* rtcp sender statistics receive */
171 int64_t last_rtcp_ntp_time; // TODO: move into statistics
172 uint32_t last_rtcp_timestamp; // TODO: move into statistics
173
174 /* rtcp sender statistics */
175 unsigned int packet_count; // TODO: move into statistics (outgoing)
176 unsigned int octet_count; // TODO: move into statistics (outgoing)
177 unsigned int last_octet_count; // TODO: move into statistics (outgoing)
178 int first_packet;
179 /* buffer for output */
180 uint8_t buf[RTP_MAX_PACKET_LENGTH];
181 uint8_t *buf_ptr;
182
183 /* special infos for au headers parsing */
184 RTPPayloadData *rtp_payload_data; // TODO: Move into dynamic payload handlers
185
186 /* dynamic payload stuff */
187 DynamicPayloadPacketHandlerProc parse_packet; ///< This is also copied from the dynamic protocol handler structure
188 PayloadContext *dynamic_protocol_context; ///< This is a copy from the values setup from the sdp parsing, in rtsp.c don't free me.
189 int max_frames_per_packet;
190 };
191
192 extern RTPDynamicProtocolHandler *RTPFirstDynamicPayloadHandler;
193 void ff_register_dynamic_payload_handler(RTPDynamicProtocolHandler *handler);
194
195 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.
196
197 void av_register_rtp_dynamic_payload_handlers(void);
198
199 #endif /* AVFORMAT_RTPDEC_H */