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_RTP_H
23 #define AVFORMAT_RTP_H
25 #include "libavcodec/avcodec.h"
28 /** Structure listing useful vars to parse RTP packet payload*/
29 typedef struct rtp_payload_data
39 /** mpeg 4 AU headers */
51 int au_headers_length_bytes;
55 typedef struct PayloadContext PayloadContext;
56 typedef struct RTPDynamicProtocolHandler_s RTPDynamicProtocolHandler;
58 #define RTP_MIN_PACKET_LENGTH 12
59 #define RTP_MAX_PACKET_LENGTH 1500 /* XXX: suppress this define */
61 int rtp_get_codec_info(AVCodecContext *codec, int payload_type);
63 /** return < 0 if unknown payload type */
64 int rtp_get_payload_type(AVCodecContext *codec);
66 typedef struct RTPDemuxContext RTPDemuxContext;
67 RTPDemuxContext *rtp_parse_open(AVFormatContext *s1, AVStream *st, URLContext *rtpc, int payload_type, RTPPayloadData *rtp_payload_data);
68 void rtp_parse_set_dynamic_protocol(RTPDemuxContext *s, PayloadContext *ctx,
69 RTPDynamicProtocolHandler *handler);
70 int rtp_parse_packet(RTPDemuxContext *s, AVPacket *pkt,
71 const uint8_t *buf, int len);
72 void rtp_parse_close(RTPDemuxContext *s);
74 int rtp_get_local_port(URLContext *h);
75 int rtp_set_remote_url(URLContext *h, const char *uri);
76 void rtp_get_file_handles(URLContext *h, int *prtp_fd, int *prtcp_fd);
79 * some rtp servers assume client is dead if they don't hear from them...
80 * so we send a Receiver Report to the provided ByteIO context
81 * (we don't have access to the rtcp handle from here)
83 int rtp_check_and_send_back_rr(RTPDemuxContext *s, int count);
85 #define RTP_PT_PRIVATE 96
87 #define RTP_MAX_SDES 256 /**< maximum text length for SDES */
89 /* RTCP paquets use 0.5 % of the bandwidth */
90 #define RTCP_TX_RATIO_NUM 5
91 #define RTCP_TX_RATIO_DEN 1000
93 // these statistics are used for rtcp receiver reports...
95 uint16_t max_seq; ///< highest sequence number seen
96 uint32_t cycles; ///< shifted count of sequence number cycles
97 uint32_t base_seq; ///< base sequence number
98 uint32_t bad_seq; ///< last bad sequence number + 1
99 int probation; ///< sequence packets till source is valid
100 int received; ///< packets received
101 int expected_prior; ///< packets expected in last interval
102 int received_prior; ///< packets received in last interval
103 uint32_t transit; ///< relative transit time for previous packet
104 uint32_t jitter; ///< estimated jitter.
108 * Packet parsing for "private" payloads in the RTP specs.
110 * @param s stream context
111 * @param st stream that this packet belongs to
112 * @param pkt packet in which to write the parsed data
113 * @param timestamp pointer in which to write the timestamp of this RTP packet
114 * @param buf pointer to raw RTP packet data
115 * @param len length of buf
116 * @param flags flags from the RTP packet header (PKT_FLAG_*)
118 typedef int (*DynamicPayloadPacketHandlerProc) (PayloadContext *s,
125 struct RTPDynamicProtocolHandler_s {
126 // fields from AVRtpDynamicPayloadType_s
127 const char enc_name[50]; /* XXX: still why 50 ? ;-) */
128 enum CodecType codec_type;
129 enum CodecID codec_id;
132 int (*parse_sdp_a_line) (AVFormatContext *s,
134 PayloadContext *priv_data,
135 const char *line); ///< Parse the a= line from the sdp field
136 PayloadContext *(*open) (); ///< allocate any data needed by the rtp parsing for this dynamic data.
137 void (*close)(PayloadContext *protocol_data); ///< free any data needed by the rtp parsing for this dynamic data.
138 DynamicPayloadPacketHandlerProc parse_packet; ///< parse handler for this dynamic packet.
140 struct RTPDynamicProtocolHandler_s *next;
143 // moved out of rtp.c, because the h264 decoder needs to know about this structure..
144 struct RTPDemuxContext {
151 uint32_t base_timestamp;
152 uint32_t cur_timestamp;
153 int max_payload_size;
154 struct MpegTSContext *ts; /* only used for MP2T payloads */
158 /* used to send back RTCP RR */
162 RTPStatistics statistics; ///< Statistics for this stream (used by RTCP receiver reports)
164 /* rtcp sender statistics receive */
165 int64_t last_rtcp_ntp_time; // TODO: move into statistics
166 int64_t first_rtcp_ntp_time; // TODO: move into statistics
167 uint32_t last_rtcp_timestamp; // TODO: move into statistics
169 /* rtcp sender statistics */
170 unsigned int packet_count; // TODO: move into statistics (outgoing)
171 unsigned int octet_count; // TODO: move into statistics (outgoing)
172 unsigned int last_octet_count; // TODO: move into statistics (outgoing)
174 /* buffer for output */
175 uint8_t buf[RTP_MAX_PACKET_LENGTH];
178 /* special infos for au headers parsing */
179 RTPPayloadData *rtp_payload_data; // TODO: Move into dynamic payload handlers
181 /* dynamic payload stuff */
182 DynamicPayloadPacketHandlerProc parse_packet; ///< This is also copied from the dynamic protocol handler structure
183 PayloadContext *dynamic_protocol_context; ///< This is a copy from the values setup from the sdp parsing, in rtsp.c don't free me.
184 int max_frames_per_packet;
187 extern RTPDynamicProtocolHandler *RTPFirstDynamicPayloadHandler;
188 void ff_register_dynamic_payload_handler(RTPDynamicProtocolHandler *handler);
190 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.
192 void ff_rtp_send_data(AVFormatContext *s1, const uint8_t *buf1, int len, int m);
193 const char *ff_rtp_enc_name(int payload_type);
194 enum CodecID ff_rtp_codec_id(const char *buf, enum CodecType codec_type);
196 void av_register_rtp_dynamic_payload_handlers(void);
198 #endif /* AVFORMAT_RTP_H */