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 *rtp_parse_open(AVFormatContext *s1, AVStream *st, URLContext *rtpc, int payload_type, int queue_size);
42 void rtp_parse_set_dynamic_protocol(RTPDemuxContext *s, PayloadContext *ctx,
43 RTPDynamicProtocolHandler *handler);
44 int rtp_parse_packet(RTPDemuxContext *s, AVPacket *pkt,
45 uint8_t **buf, int len);
46 void 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 rtp_get_local_rtp_port(URLContext *h);
50 int rtp_get_local_rtcp_port(URLContext *h);
52 int 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 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 rtp_check_and_send_back_rr(RTPDemuxContext *s, int count);
75 * Get the file handle for the RTCP socket.
77 int rtp_get_rtcp_file_handle(URLContext *h);
79 // these statistics are used for rtcp receiver reports...
81 uint16_t max_seq; ///< highest sequence number seen
82 uint32_t cycles; ///< shifted count of sequence number cycles
83 uint32_t base_seq; ///< base sequence number
84 uint32_t bad_seq; ///< last bad sequence number + 1
85 int probation; ///< sequence packets till source is valid
86 int received; ///< packets received
87 int expected_prior; ///< packets expected in last interval
88 int received_prior; ///< packets received in last interval
89 uint32_t transit; ///< relative transit time for previous packet
90 uint32_t jitter; ///< estimated jitter.
93 #define RTP_FLAG_KEY 0x1 ///< RTP packet contains a keyframe
94 #define RTP_FLAG_MARKER 0x2 ///< RTP marker bit was set for this packet
96 * Packet parsing for "private" payloads in the RTP specs.
98 * @param ctx RTSP demuxer context
99 * @param s stream context
100 * @param st stream that this packet belongs to
101 * @param pkt packet in which to write the parsed data
102 * @param timestamp pointer in which to write the timestamp of this RTP packet
103 * @param buf pointer to raw RTP packet data
104 * @param len length of buf
105 * @param flags flags from the RTP packet header (RTP_FLAG_*)
107 typedef int (*DynamicPayloadPacketHandlerProc) (AVFormatContext *ctx,
115 struct RTPDynamicProtocolHandler_s {
116 // fields from AVRtpDynamicPayloadType_s
117 const char enc_name[50]; /* XXX: still why 50 ? ;-) */
118 enum AVMediaType codec_type;
119 enum CodecID codec_id;
120 int static_payload_id; /* 0 means no payload id is set. 0 is a valid
121 * payload ID (PCMU), too, but that format doesn't
122 * require any custom depacketization code. */
125 int (*parse_sdp_a_line) (AVFormatContext *s,
127 PayloadContext *priv_data,
128 const char *line); ///< Parse the a= line from the sdp field
129 PayloadContext *(*alloc) (void); ///< allocate any data needed by the rtp parsing for this dynamic data.
130 void (*free)(PayloadContext *protocol_data); ///< free any data needed by the rtp parsing for this dynamic data.
131 DynamicPayloadPacketHandlerProc parse_packet; ///< parse handler for this dynamic packet.
133 struct RTPDynamicProtocolHandler_s *next;
136 typedef struct RTPPacket {
141 struct RTPPacket *next;
144 // moved out of rtp.c, because the h264 decoder needs to know about this structure..
145 struct RTPDemuxContext {
152 uint32_t base_timestamp;
153 uint32_t cur_timestamp;
154 int64_t range_start_offset;
155 int max_payload_size;
156 struct MpegTSContext *ts; /* only used for MP2T payloads */
159 /* used to send back RTCP RR */
163 RTPStatistics statistics; ///< Statistics for this stream (used by RTCP receiver reports)
165 /** Fields for packet reordering @{ */
166 int prev_ret; ///< The return value of the actual parsing of the previous packet
167 RTPPacket* queue; ///< A sorted queue of buffered packets not yet returned
168 int queue_len; ///< The number of packets in queue
169 int queue_size; ///< The size of queue, or 0 if reordering is disabled
172 /* rtcp sender statistics receive */
173 int64_t last_rtcp_ntp_time; // TODO: move into statistics
174 int64_t first_rtcp_ntp_time; // TODO: move into statistics
175 uint32_t last_rtcp_timestamp; // TODO: move into statistics
176 int64_t rtcp_ts_offset;
178 /* rtcp sender statistics */
179 unsigned int packet_count; // TODO: move into statistics (outgoing)
180 unsigned int octet_count; // TODO: move into statistics (outgoing)
181 unsigned int last_octet_count; // TODO: move into statistics (outgoing)
183 /* buffer for output */
184 uint8_t buf[RTP_MAX_PACKET_LENGTH];
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;
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);
199 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.
201 int ff_parse_fmtp(AVStream *stream, PayloadContext *data, const char *p,
202 int (*parse_fmtp)(AVStream *stream,
203 PayloadContext *data,
204 char *attr, char *value));
206 void av_register_rtp_dynamic_payload_handlers(void);
208 #endif /* AVFORMAT_RTPDEC_H */