2 * RTP demuxer definitions
3 * Copyright (c) 2002 Fabrice Bellard
4 * Copyright (c) 2006 Ryan Martell <rdm4@martellventures.com>
6 * This file is part of Libav.
8 * Libav 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.
13 * Libav 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.
18 * You should have received a copy of the GNU Lesser General Public
19 * License along with Libav; if not, write to the Free Software
20 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
22 #ifndef AVFORMAT_RTPDEC_H
23 #define AVFORMAT_RTPDEC_H
25 #include "libavcodec/avcodec.h"
30 typedef struct PayloadContext PayloadContext;
31 typedef struct RTPDynamicProtocolHandler_s RTPDynamicProtocolHandler;
33 #define RTP_MIN_PACKET_LENGTH 12
34 #define RTP_MAX_PACKET_LENGTH 1500 /* XXX: suppress this define */
36 #define RTP_REORDER_QUEUE_DEFAULT_SIZE 10
38 #define RTP_NOTS_VALUE ((uint32_t)-1)
40 typedef struct RTPDemuxContext RTPDemuxContext;
41 RTPDemuxContext *ff_rtp_parse_open(AVFormatContext *s1, AVStream *st, URLContext *rtpc, int payload_type, int queue_size);
42 void ff_rtp_parse_set_dynamic_protocol(RTPDemuxContext *s, PayloadContext *ctx,
43 RTPDynamicProtocolHandler *handler);
44 int ff_rtp_parse_packet(RTPDemuxContext *s, AVPacket *pkt,
45 uint8_t **buf, int len);
46 void ff_rtp_parse_close(RTPDemuxContext *s);
47 int64_t ff_rtp_queued_packet_time(RTPDemuxContext *s);
48 void ff_rtp_reset_packet_queue(RTPDemuxContext *s);
49 int ff_rtp_get_local_rtp_port(URLContext *h);
50 int ff_rtp_get_local_rtcp_port(URLContext *h);
52 int ff_rtp_set_remote_url(URLContext *h, const char *uri);
55 * Send a dummy packet on both port pairs to set up the connection
56 * state in potential NAT routers, so that we're able to receive
59 * Note, this only works if the NAT router doesn't remap ports. This
60 * isn't a standardized procedure, but it works in many cases in practice.
62 * The same routine is used with RDT too, even if RDT doesn't use normal
63 * RTP packets otherwise.
65 void ff_rtp_send_punch_packets(URLContext* rtp_handle);
68 * some rtp servers assume client is dead if they don't hear from them...
69 * so we send a Receiver Report to the provided ByteIO context
70 * (we don't have access to the rtcp handle from here)
72 int ff_rtp_check_and_send_back_rr(RTPDemuxContext *s, int count);
74 // these statistics are used for rtcp receiver reports...
75 typedef struct RTPStatistics {
76 uint16_t max_seq; ///< highest sequence number seen
77 uint32_t cycles; ///< shifted count of sequence number cycles
78 uint32_t base_seq; ///< base sequence number
79 uint32_t bad_seq; ///< last bad sequence number + 1
80 int probation; ///< sequence packets till source is valid
81 int received; ///< packets received
82 int expected_prior; ///< packets expected in last interval
83 int received_prior; ///< packets received in last interval
84 uint32_t transit; ///< relative transit time for previous packet
85 uint32_t jitter; ///< estimated jitter.
88 #define RTP_FLAG_KEY 0x1 ///< RTP packet contains a keyframe
89 #define RTP_FLAG_MARKER 0x2 ///< RTP marker bit was set for this packet
91 * Packet parsing for "private" payloads in the RTP specs.
93 * @param ctx RTSP demuxer context
94 * @param s stream context
95 * @param st stream that this packet belongs to
96 * @param pkt packet in which to write the parsed data
97 * @param timestamp pointer to the RTP timestamp of the input data, can be
98 * updated by the function if returning older, buffered data
99 * @param buf pointer to raw RTP packet data
100 * @param len length of buf
101 * @param flags flags from the RTP packet header (RTP_FLAG_*)
103 typedef int (*DynamicPayloadPacketHandlerProc) (AVFormatContext *ctx,
111 struct RTPDynamicProtocolHandler_s {
112 // fields from AVRtpDynamicPayloadType_s
113 const char enc_name[50]; /* XXX: still why 50 ? ;-) */
114 enum AVMediaType codec_type;
115 enum AVCodecID codec_id;
116 int static_payload_id; /* 0 means no payload id is set. 0 is a valid
117 * payload ID (PCMU), too, but that format doesn't
118 * require any custom depacketization code. */
121 int (*init)(AVFormatContext *s, int st_index, PayloadContext *priv_data); ///< Initialize dynamic protocol handler, called after the full rtpmap line is parsed
122 int (*parse_sdp_a_line) (AVFormatContext *s,
124 PayloadContext *priv_data,
125 const char *line); ///< Parse the a= line from the sdp field
126 PayloadContext *(*alloc) (void); ///< allocate any data needed by the rtp parsing for this dynamic data.
127 void (*free)(PayloadContext *protocol_data); ///< free any data needed by the rtp parsing for this dynamic data.
128 DynamicPayloadPacketHandlerProc parse_packet; ///< parse handler for this dynamic packet.
130 struct RTPDynamicProtocolHandler_s *next;
133 typedef struct RTPPacket {
138 struct RTPPacket *next;
141 // moved out of rtp.c, because the h264 decoder needs to know about this structure..
142 struct RTPDemuxContext {
149 uint32_t base_timestamp;
150 uint32_t cur_timestamp;
151 int64_t unwrapped_timestamp;
152 int64_t range_start_offset;
153 int max_payload_size;
154 struct MpegTSContext *ts; /* only used for MP2T payloads */
157 /* used to send back RTCP RR */
161 RTPStatistics statistics; ///< Statistics for this stream (used by RTCP receiver reports)
163 /** Fields for packet reordering @{ */
164 int prev_ret; ///< The return value of the actual parsing of the previous packet
165 RTPPacket* queue; ///< A sorted queue of buffered packets not yet returned
166 int queue_len; ///< The number of packets in queue
167 int queue_size; ///< The size of queue, or 0 if reordering is disabled
170 /* rtcp sender statistics receive */
171 int64_t last_rtcp_ntp_time; // TODO: move into statistics
172 int64_t first_rtcp_ntp_time; // TODO: move into statistics
173 uint32_t last_rtcp_timestamp; // TODO: move into statistics
174 int64_t rtcp_ts_offset;
176 /* rtcp sender statistics */
177 unsigned int packet_count; // TODO: move into statistics (outgoing)
178 unsigned int octet_count; // TODO: move into statistics (outgoing)
179 unsigned int last_octet_count; // TODO: move into statistics (outgoing)
180 /* buffer for partially parsed packets */
181 uint8_t buf[RTP_MAX_PACKET_LENGTH];
183 /* dynamic payload stuff */
184 DynamicPayloadPacketHandlerProc parse_packet; ///< This is also copied from the dynamic protocol handler structure
185 PayloadContext *dynamic_protocol_context; ///< This is a copy from the values setup from the sdp parsing, in rtsp.c don't free me.
188 void ff_register_dynamic_payload_handler(RTPDynamicProtocolHandler *handler);
189 RTPDynamicProtocolHandler *ff_rtp_handler_find_by_name(const char *name,
190 enum AVMediaType codec_type);
191 RTPDynamicProtocolHandler *ff_rtp_handler_find_by_id(int id,
192 enum AVMediaType codec_type);
194 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 int ff_parse_fmtp(AVStream *stream, PayloadContext *data, const char *p,
197 int (*parse_fmtp)(AVStream *stream,
198 PayloadContext *data,
199 char *attr, char *value));
201 void av_register_rtp_dynamic_payload_handlers(void);
204 * Close the dynamic buffer and make a packet from it.
206 int ff_rtp_finalize_packet(AVPacket *pkt, AVIOContext **dyn_buf, int stream_idx);
208 #endif /* AVFORMAT_RTPDEC_H */