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*/ 30typedef 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 au_headers_allocated; 52 int nb_au_headers; 53 int au_headers_length_bytes; 54 int cur_au_index; 55} RTPPayloadData; 56 57typedef struct PayloadContext PayloadContext; 58typedef struct RTPDynamicProtocolHandler_s RTPDynamicProtocolHandler; 59 60#define RTP_MIN_PACKET_LENGTH 12 61#define RTP_MAX_PACKET_LENGTH 1500 /* XXX: suppress this define */ 62 63typedef struct RTPDemuxContext RTPDemuxContext; 64RTPDemuxContext *rtp_parse_open(AVFormatContext *s1, AVStream *st, URLContext *rtpc, int payload_type, RTPPayloadData *rtp_payload_data); 65void rtp_parse_set_dynamic_protocol(RTPDemuxContext *s, PayloadContext *ctx, 66 RTPDynamicProtocolHandler *handler); 67int rtp_parse_packet(RTPDemuxContext *s, AVPacket *pkt, 68 const uint8_t *buf, int len); 69void rtp_parse_close(RTPDemuxContext *s); 70#if (LIBAVFORMAT_VERSION_MAJOR <= 53) 71int rtp_get_local_port(URLContext *h); 72#endif 73int rtp_get_local_rtp_port(URLContext *h); 74int rtp_get_local_rtcp_port(URLContext *h); 75 76int rtp_set_remote_url(URLContext *h, const char *uri); 77#if (LIBAVFORMAT_VERSION_MAJOR <= 52) 78void rtp_get_file_handles(URLContext *h, int *prtp_fd, int *prtcp_fd); 79#endif 80 81/** 82 * Send a dummy packet on both port pairs to set up the connection 83 * state in potential NAT routers, so that we're able to receive 84 * packets. 85 * 86 * Note, this only works if the NAT router doesn't remap ports. This 87 * isn't a standardized procedure, but it works in many cases in practice. 88 * 89 * The same routine is used with RDT too, even if RDT doesn't use normal 90 * RTP packets otherwise. 91 */ 92void rtp_send_punch_packets(URLContext* rtp_handle); 93 94/** 95 * some rtp servers assume client is dead if they don't hear from them... 96 * so we send a Receiver Report to the provided ByteIO context 97 * (we don't have access to the rtcp handle from here) 98 */ 99int rtp_check_and_send_back_rr(RTPDemuxContext *s, int count); 100 101// these statistics are used for rtcp receiver reports... 102typedef struct { 103 uint16_t max_seq; ///< highest sequence number seen 104 uint32_t cycles; ///< shifted count of sequence number cycles 105 uint32_t base_seq; ///< base sequence number 106 uint32_t bad_seq; ///< last bad sequence number + 1 107 int probation; ///< sequence packets till source is valid 108 int received; ///< packets received 109 int expected_prior; ///< packets expected in last interval 110 int received_prior; ///< packets received in last interval 111 uint32_t transit; ///< relative transit time for previous packet 112 uint32_t jitter; ///< estimated jitter. 113} RTPStatistics; 114 115#define RTP_FLAG_KEY 0x1 ///< RTP packet contains a keyframe 116#define RTP_FLAG_MARKER 0x2 ///< RTP marker bit was set for this packet 117/** 118 * Packet parsing for "private" payloads in the RTP specs. 119 * 120 * @param ctx RTSP demuxer context 121 * @param s stream context 122 * @param st stream that this packet belongs to 123 * @param pkt packet in which to write the parsed data 124 * @param timestamp pointer in which to write the timestamp of this RTP packet 125 * @param buf pointer to raw RTP packet data 126 * @param len length of buf 127 * @param flags flags from the RTP packet header (RTP_FLAG_*) 128 */ 129typedef int (*DynamicPayloadPacketHandlerProc) (AVFormatContext *ctx, 130 PayloadContext *s, 131 AVStream *st, 132 AVPacket * pkt, 133 uint32_t *timestamp, 134 const uint8_t * buf, 135 int len, int flags); 136 137struct RTPDynamicProtocolHandler_s { 138 // fields from AVRtpDynamicPayloadType_s 139 const char enc_name[50]; /* XXX: still why 50 ? ;-) */ 140 enum AVMediaType codec_type; 141 enum CodecID codec_id; 142 143 // may be null 144 int (*parse_sdp_a_line) (AVFormatContext *s, 145 int st_index, 146 PayloadContext *priv_data, 147 const char *line); ///< Parse the a= line from the sdp field 148 PayloadContext *(*open) (void); ///< allocate any data needed by the rtp parsing for this dynamic data. 149 void (*close)(PayloadContext *protocol_data); ///< free any data needed by the rtp parsing for this dynamic data. 150 DynamicPayloadPacketHandlerProc parse_packet; ///< parse handler for this dynamic packet. 151 152 struct RTPDynamicProtocolHandler_s *next; 153}; 154 155// moved out of rtp.c, because the h264 decoder needs to know about this structure.. 156struct RTPDemuxContext { 157 AVFormatContext *ic; 158 AVStream *st; 159 int payload_type; 160 uint32_t ssrc; 161 uint16_t seq; 162 uint32_t timestamp; 163 uint32_t base_timestamp; 164 uint32_t cur_timestamp; 165 int64_t range_start_offset; 166 int max_payload_size; 167 struct MpegTSContext *ts; /* only used for MP2T payloads */ 168 int read_buf_index; 169 int read_buf_size; 170 /* used to send back RTCP RR */ 171 URLContext *rtp_ctx; 172 char hostname[256]; 173 174 RTPStatistics statistics; ///< Statistics for this stream (used by RTCP receiver reports) 175 176 /* rtcp sender statistics receive */ 177 int64_t last_rtcp_ntp_time; // TODO: move into statistics 178 int64_t first_rtcp_ntp_time; // TODO: move into statistics 179 uint32_t last_rtcp_timestamp; // TODO: move into statistics 180 181 /* rtcp sender statistics */ 182 unsigned int packet_count; // TODO: move into statistics (outgoing) 183 unsigned int octet_count; // TODO: move into statistics (outgoing) 184 unsigned int last_octet_count; // TODO: move into statistics (outgoing) 185 int first_packet; 186 /* buffer for output */ 187 uint8_t buf[RTP_MAX_PACKET_LENGTH]; 188 uint8_t *buf_ptr; 189 190 /* special infos for au headers parsing */ 191 RTPPayloadData *rtp_payload_data; // TODO: Move into dynamic payload handlers 192 193 /* dynamic payload stuff */ 194 DynamicPayloadPacketHandlerProc parse_packet; ///< This is also copied from the dynamic protocol handler structure 195 PayloadContext *dynamic_protocol_context; ///< This is a copy from the values setup from the sdp parsing, in rtsp.c don't free me. 196 int max_frames_per_packet; 197}; 198 199extern RTPDynamicProtocolHandler *RTPFirstDynamicPayloadHandler; 200void ff_register_dynamic_payload_handler(RTPDynamicProtocolHandler *handler); 201 202int 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. 203 204void av_register_rtp_dynamic_payload_handlers(void); 205 206#endif /* AVFORMAT_RTPDEC_H */ 207