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 Libav. 7 * 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. 12 * 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. 17 * 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 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#include "url.h" 29 30typedef struct PayloadContext PayloadContext; 31typedef struct RTPDynamicProtocolHandler_s RTPDynamicProtocolHandler; 32 33#define RTP_MIN_PACKET_LENGTH 12 34#define RTP_MAX_PACKET_LENGTH 1500 /* XXX: suppress this define */ 35 36#define RTP_REORDER_QUEUE_DEFAULT_SIZE 10 37 38#define RTP_NOTS_VALUE ((uint32_t)-1) 39 40typedef struct RTPDemuxContext RTPDemuxContext; 41RTPDemuxContext *ff_rtp_parse_open(AVFormatContext *s1, AVStream *st, URLContext *rtpc, int payload_type, int queue_size); 42void ff_rtp_parse_set_dynamic_protocol(RTPDemuxContext *s, PayloadContext *ctx, 43 RTPDynamicProtocolHandler *handler); 44int ff_rtp_parse_packet(RTPDemuxContext *s, AVPacket *pkt, 45 uint8_t **buf, int len); 46void ff_rtp_parse_close(RTPDemuxContext *s); 47int64_t ff_rtp_queued_packet_time(RTPDemuxContext *s); 48void ff_rtp_reset_packet_queue(RTPDemuxContext *s); 49int ff_rtp_get_local_rtp_port(URLContext *h); 50int ff_rtp_get_local_rtcp_port(URLContext *h); 51 52int ff_rtp_set_remote_url(URLContext *h, const char *uri); 53 54/** 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 57 * packets. 58 * 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. 61 * 62 * The same routine is used with RDT too, even if RDT doesn't use normal 63 * RTP packets otherwise. 64 */ 65void ff_rtp_send_punch_packets(URLContext* rtp_handle); 66 67/** 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) 71 */ 72int ff_rtp_check_and_send_back_rr(RTPDemuxContext *s, int count); 73 74/** 75 * Get the file handle for the RTCP socket. 76 */ 77int ff_rtp_get_rtcp_file_handle(URLContext *h); 78 79// these statistics are used for rtcp receiver reports... 80typedef struct { 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. 91} RTPStatistics; 92 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 95/** 96 * Packet parsing for "private" payloads in the RTP specs. 97 * 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_*) 106 */ 107typedef int (*DynamicPayloadPacketHandlerProc) (AVFormatContext *ctx, 108 PayloadContext *s, 109 AVStream *st, 110 AVPacket * pkt, 111 uint32_t *timestamp, 112 const uint8_t * buf, 113 int len, int flags); 114 115struct 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. */ 123 124 // may be null 125 int (*init)(AVFormatContext *s, int st_index, PayloadContext *priv_data); ///< Initialize dynamic protocol handler, called after the full rtpmap line is parsed 126 int (*parse_sdp_a_line) (AVFormatContext *s, 127 int st_index, 128 PayloadContext *priv_data, 129 const char *line); ///< Parse the a= line from the sdp field 130 PayloadContext *(*alloc) (void); ///< allocate any data needed by the rtp parsing for this dynamic data. 131 void (*free)(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. 133 134 struct RTPDynamicProtocolHandler_s *next; 135}; 136 137typedef struct RTPPacket { 138 uint16_t seq; 139 uint8_t *buf; 140 int len; 141 int64_t recvtime; 142 struct RTPPacket *next; 143} RTPPacket; 144 145// moved out of rtp.c, because the h264 decoder needs to know about this structure.. 146struct RTPDemuxContext { 147 AVFormatContext *ic; 148 AVStream *st; 149 int payload_type; 150 uint32_t ssrc; 151 uint16_t seq; 152 uint32_t timestamp; 153 uint32_t base_timestamp; 154 uint32_t cur_timestamp; 155 int64_t unwrapped_timestamp; 156 int64_t range_start_offset; 157 int max_payload_size; 158 struct MpegTSContext *ts; /* only used for MP2T payloads */ 159 int read_buf_index; 160 int read_buf_size; 161 /* used to send back RTCP RR */ 162 URLContext *rtp_ctx; 163 char hostname[256]; 164 165 RTPStatistics statistics; ///< Statistics for this stream (used by RTCP receiver reports) 166 167 /** Fields for packet reordering @{ */ 168 int prev_ret; ///< The return value of the actual parsing of the previous packet 169 RTPPacket* queue; ///< A sorted queue of buffered packets not yet returned 170 int queue_len; ///< The number of packets in queue 171 int queue_size; ///< The size of queue, or 0 if reordering is disabled 172 /*@}*/ 173 174 /* rtcp sender statistics receive */ 175 int64_t last_rtcp_ntp_time; // TODO: move into statistics 176 int64_t first_rtcp_ntp_time; // TODO: move into statistics 177 uint32_t last_rtcp_timestamp; // TODO: move into statistics 178 int64_t rtcp_ts_offset; 179 180 /* rtcp sender statistics */ 181 unsigned int packet_count; // TODO: move into statistics (outgoing) 182 unsigned int octet_count; // TODO: move into statistics (outgoing) 183 unsigned int last_octet_count; // TODO: move into statistics (outgoing) 184 int first_packet; 185 /* buffer for output */ 186 uint8_t buf[RTP_MAX_PACKET_LENGTH]; 187 uint8_t *buf_ptr; 188 189 /* dynamic payload stuff */ 190 DynamicPayloadPacketHandlerProc parse_packet; ///< This is also copied from the dynamic protocol handler structure 191 PayloadContext *dynamic_protocol_context; ///< This is a copy from the values setup from the sdp parsing, in rtsp.c don't free me. 192 int max_frames_per_packet; 193}; 194 195void ff_register_dynamic_payload_handler(RTPDynamicProtocolHandler *handler); 196RTPDynamicProtocolHandler *ff_rtp_handler_find_by_name(const char *name, 197 enum AVMediaType codec_type); 198RTPDynamicProtocolHandler *ff_rtp_handler_find_by_id(int id, 199 enum AVMediaType codec_type); 200 201int 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. 202 203int ff_parse_fmtp(AVStream *stream, PayloadContext *data, const char *p, 204 int (*parse_fmtp)(AVStream *stream, 205 PayloadContext *data, 206 char *attr, char *value)); 207 208void av_register_rtp_dynamic_payload_handlers(void); 209 210#endif /* AVFORMAT_RTPDEC_H */ 211