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 FFmpeg.
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.
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.
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
22 #ifndef AVFORMAT_RTPDEC_H
23 #define AVFORMAT_RTPDEC_H
25 #include "libavcodec/avcodec.h"
29 /** Structure listing useful vars to parse RTP packet payload*/
30 typedef struct rtp_payload_data
40 /** mpeg 4 AU headers */
52 int au_headers_length_bytes;
56 typedef struct PayloadContext PayloadContext;
57 typedef struct RTPDynamicProtocolHandler_s RTPDynamicProtocolHandler;
59 #define RTP_MIN_PACKET_LENGTH 12
60 #define RTP_MAX_PACKET_LENGTH 1500 /* XXX: suppress this define */
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);
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);
77 * some rtp servers assume client is dead if they don't hear from them...
78 * so we send a Receiver Report to the provided ByteIO context
79 * (we don't have access to the rtcp handle from here)
81 int rtp_check_and_send_back_rr(RTPDemuxContext *s, int count);
83 // these statistics are used for rtcp receiver reports...
85 uint16_t max_seq; ///< highest sequence number seen
86 uint32_t cycles; ///< shifted count of sequence number cycles
87 uint32_t base_seq; ///< base sequence number
88 uint32_t bad_seq; ///< last bad sequence number + 1
89 int probation; ///< sequence packets till source is valid
90 int received; ///< packets received
91 int expected_prior; ///< packets expected in last interval
92 int received_prior; ///< packets received in last interval
93 uint32_t transit; ///< relative transit time for previous packet
94 uint32_t jitter; ///< estimated jitter.
97 #define RTP_FLAG_KEY 0x1 ///< RTP packet contains a keyframe
98 #define RTP_FLAG_MARKER 0x2 ///< RTP marker bit was set for this packet
100 * Packet parsing for "private" payloads in the RTP specs.
102 * @param ctx RTSP demuxer context
103 * @param s stream context
104 * @param st stream that this packet belongs to
105 * @param pkt packet in which to write the parsed data
106 * @param timestamp pointer in which to write the timestamp of this RTP packet
107 * @param buf pointer to raw RTP packet data
108 * @param len length of buf
109 * @param flags flags from the RTP packet header (RTP_FLAG_*)
111 typedef int (*DynamicPayloadPacketHandlerProc) (AVFormatContext *ctx,
119 struct RTPDynamicProtocolHandler_s {
120 // fields from AVRtpDynamicPayloadType_s
121 const char enc_name[50]; /* XXX: still why 50 ? ;-) */
122 enum CodecType codec_type;
123 enum CodecID codec_id;
126 int (*parse_sdp_a_line) (AVFormatContext *s,
128 PayloadContext *priv_data,
129 const char *line); ///< Parse the a= line from the sdp field
130 PayloadContext *(*open) (); ///< allocate any data needed by the rtp parsing for this dynamic data.
131 void (*close)(PayloadContext *protocol_data); ///< free any data needed by the rtp parsing for this dynamic data.
132 DynamicPayloadPacketHandlerProc parse_packet; ///< parse handler for this dynamic packet.
134 struct RTPDynamicProtocolHandler_s *next;
137 // moved out of rtp.c, because the h264 decoder needs to know about this structure..
138 struct RTPDemuxContext {
145 uint32_t base_timestamp;
146 uint32_t cur_timestamp;
147 int max_payload_size;
148 struct MpegTSContext *ts; /* only used for MP2T payloads */
151 /* used to send back RTCP RR */
155 RTPStatistics statistics; ///< Statistics for this stream (used by RTCP receiver reports)
157 /* rtcp sender statistics receive */
158 int64_t last_rtcp_ntp_time; // TODO: move into statistics
159 int64_t first_rtcp_ntp_time; // TODO: move into statistics
160 uint32_t last_rtcp_timestamp; // TODO: move into statistics
162 /* rtcp sender statistics */
163 unsigned int packet_count; // TODO: move into statistics (outgoing)
164 unsigned int octet_count; // TODO: move into statistics (outgoing)
165 unsigned int last_octet_count; // TODO: move into statistics (outgoing)
167 /* buffer for output */
168 uint8_t buf[RTP_MAX_PACKET_LENGTH];
171 /* special infos for au headers parsing */
172 RTPPayloadData *rtp_payload_data; // TODO: Move into dynamic payload handlers
174 /* dynamic payload stuff */
175 DynamicPayloadPacketHandlerProc parse_packet; ///< This is also copied from the dynamic protocol handler structure
176 PayloadContext *dynamic_protocol_context; ///< This is a copy from the values setup from the sdp parsing, in rtsp.c don't free me.
177 int max_frames_per_packet;
180 extern RTPDynamicProtocolHandler *RTPFirstDynamicPayloadHandler;
181 void ff_register_dynamic_payload_handler(RTPDynamicProtocolHandler *handler);
183 int 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.
185 void av_register_rtp_dynamic_payload_handlers(void);
187 #endif /* AVFORMAT_RTPDEC_H */