| 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 | |
| 23 | #ifndef AVFORMAT_RTPDEC_H |
| 24 | #define AVFORMAT_RTPDEC_H |
| 25 | |
| 26 | #include "libavcodec/avcodec.h" |
| 27 | #include "avformat.h" |
| 28 | #include "rtp.h" |
| 29 | #include "url.h" |
| 30 | #include "srtp.h" |
| 31 | |
| 32 | typedef struct PayloadContext PayloadContext; |
| 33 | typedef struct RTPDynamicProtocolHandler RTPDynamicProtocolHandler; |
| 34 | |
| 35 | #define RTP_MIN_PACKET_LENGTH 12 |
| 36 | #define RTP_MAX_PACKET_LENGTH 8192 |
| 37 | |
| 38 | #define RTP_REORDER_QUEUE_DEFAULT_SIZE 10 |
| 39 | |
| 40 | #define RTP_NOTS_VALUE ((uint32_t)-1) |
| 41 | |
| 42 | typedef struct RTPDemuxContext RTPDemuxContext; |
| 43 | RTPDemuxContext *ff_rtp_parse_open(AVFormatContext *s1, AVStream *st, |
| 44 | int payload_type, int queue_size); |
| 45 | void ff_rtp_parse_set_dynamic_protocol(RTPDemuxContext *s, PayloadContext *ctx, |
| 46 | RTPDynamicProtocolHandler *handler); |
| 47 | void ff_rtp_parse_set_crypto(RTPDemuxContext *s, const char *suite, |
| 48 | const char *params); |
| 49 | int ff_rtp_parse_packet(RTPDemuxContext *s, AVPacket *pkt, |
| 50 | uint8_t **buf, int len); |
| 51 | void ff_rtp_parse_close(RTPDemuxContext *s); |
| 52 | int64_t ff_rtp_queued_packet_time(RTPDemuxContext *s); |
| 53 | void ff_rtp_reset_packet_queue(RTPDemuxContext *s); |
| 54 | |
| 55 | /** |
| 56 | * Send a dummy packet on both port pairs to set up the connection |
| 57 | * state in potential NAT routers, so that we're able to receive |
| 58 | * packets. |
| 59 | * |
| 60 | * Note, this only works if the NAT router doesn't remap ports. This |
| 61 | * isn't a standardized procedure, but it works in many cases in practice. |
| 62 | * |
| 63 | * The same routine is used with RDT too, even if RDT doesn't use normal |
| 64 | * RTP packets otherwise. |
| 65 | */ |
| 66 | void ff_rtp_send_punch_packets(URLContext* rtp_handle); |
| 67 | |
| 68 | /** |
| 69 | * some rtp servers assume client is dead if they don't hear from them... |
| 70 | * so we send a Receiver Report to the provided URLContext or AVIOContext |
| 71 | * (we don't have access to the rtcp handle from here) |
| 72 | */ |
| 73 | int ff_rtp_check_and_send_back_rr(RTPDemuxContext *s, URLContext *fd, |
| 74 | AVIOContext *avio, int count); |
| 75 | int ff_rtp_send_rtcp_feedback(RTPDemuxContext *s, URLContext *fd, |
| 76 | AVIOContext *avio); |
| 77 | |
| 78 | // these statistics are used for rtcp receiver reports... |
| 79 | typedef struct RTPStatistics { |
| 80 | uint16_t max_seq; ///< highest sequence number seen |
| 81 | uint32_t cycles; ///< shifted count of sequence number cycles |
| 82 | uint32_t base_seq; ///< base sequence number |
| 83 | uint32_t bad_seq; ///< last bad sequence number + 1 |
| 84 | int probation; ///< sequence packets till source is valid |
| 85 | uint32_t received; ///< packets received |
| 86 | uint32_t expected_prior; ///< packets expected in last interval |
| 87 | uint32_t received_prior; ///< packets received in last interval |
| 88 | uint32_t transit; ///< relative transit time for previous packet |
| 89 | uint32_t jitter; ///< estimated jitter. |
| 90 | } RTPStatistics; |
| 91 | |
| 92 | #define RTP_FLAG_KEY 0x1 ///< RTP packet contains a keyframe |
| 93 | #define RTP_FLAG_MARKER 0x2 ///< RTP marker bit was set for this packet |
| 94 | /** |
| 95 | * Packet parsing for "private" payloads in the RTP specs. |
| 96 | * |
| 97 | * @param ctx RTSP demuxer context |
| 98 | * @param s stream context |
| 99 | * @param st stream that this packet belongs to |
| 100 | * @param pkt packet in which to write the parsed data |
| 101 | * @param timestamp pointer to the RTP timestamp of the input data, can be |
| 102 | * updated by the function if returning older, buffered data |
| 103 | * @param buf pointer to raw RTP packet data |
| 104 | * @param len length of buf |
| 105 | * @param seq RTP sequence number of the packet |
| 106 | * @param flags flags from the RTP packet header (RTP_FLAG_*) |
| 107 | */ |
| 108 | typedef int (*DynamicPayloadPacketHandlerProc)(AVFormatContext *ctx, |
| 109 | PayloadContext *s, |
| 110 | AVStream *st, AVPacket *pkt, |
| 111 | uint32_t *timestamp, |
| 112 | const uint8_t * buf, |
| 113 | int len, uint16_t seq, int flags); |
| 114 | |
| 115 | struct RTPDynamicProtocolHandler { |
| 116 | const char enc_name[50]; |
| 117 | enum AVMediaType codec_type; |
| 118 | enum AVCodecID codec_id; |
| 119 | int static_payload_id; /* 0 means no payload id is set. 0 is a valid |
| 120 | * payload ID (PCMU), too, but that format doesn't |
| 121 | * require any custom depacketization code. */ |
| 122 | |
| 123 | /** Initialize dynamic protocol handler, called after the full rtpmap line is parsed, may be null */ |
| 124 | int (*init)(AVFormatContext *s, int st_index, PayloadContext *priv_data); |
| 125 | /** Parse the a= line from the sdp field */ |
| 126 | int (*parse_sdp_a_line)(AVFormatContext *s, int st_index, |
| 127 | PayloadContext *priv_data, const char *line); |
| 128 | /** Allocate any data needed by the rtp parsing for this dynamic data. */ |
| 129 | PayloadContext *(*alloc)(void); |
| 130 | /** Free any data needed by the rtp parsing for this dynamic data. */ |
| 131 | void (*free)(PayloadContext *protocol_data); |
| 132 | /** Parse handler for this dynamic packet */ |
| 133 | DynamicPayloadPacketHandlerProc parse_packet; |
| 134 | int (*need_keyframe)(PayloadContext *context); |
| 135 | |
| 136 | struct RTPDynamicProtocolHandler *next; |
| 137 | }; |
| 138 | |
| 139 | typedef struct RTPPacket { |
| 140 | uint16_t seq; |
| 141 | uint8_t *buf; |
| 142 | int len; |
| 143 | int64_t recvtime; |
| 144 | struct RTPPacket *next; |
| 145 | } RTPPacket; |
| 146 | |
| 147 | struct RTPDemuxContext { |
| 148 | AVFormatContext *ic; |
| 149 | AVStream *st; |
| 150 | int payload_type; |
| 151 | uint32_t ssrc; |
| 152 | uint16_t seq; |
| 153 | uint32_t timestamp; |
| 154 | uint32_t base_timestamp; |
| 155 | uint32_t cur_timestamp; |
| 156 | int64_t unwrapped_timestamp; |
| 157 | int64_t range_start_offset; |
| 158 | int max_payload_size; |
| 159 | /* used to send back RTCP RR */ |
| 160 | char hostname[256]; |
| 161 | |
| 162 | int srtp_enabled; |
| 163 | struct SRTPContext srtp; |
| 164 | |
| 165 | /** Statistics for this stream (used by RTCP receiver reports) */ |
| 166 | RTPStatistics statistics; |
| 167 | |
| 168 | /** Fields for packet reordering @{ */ |
| 169 | int prev_ret; ///< The return value of the actual parsing of the previous packet |
| 170 | RTPPacket* queue; ///< A sorted queue of buffered packets not yet returned |
| 171 | int queue_len; ///< The number of packets in queue |
| 172 | int queue_size; ///< The size of queue, or 0 if reordering is disabled |
| 173 | /*@}*/ |
| 174 | |
| 175 | /* rtcp sender statistics receive */ |
| 176 | uint64_t last_rtcp_ntp_time; |
| 177 | int64_t last_rtcp_reception_time; |
| 178 | uint64_t first_rtcp_ntp_time; |
| 179 | uint32_t last_rtcp_timestamp; |
| 180 | int64_t rtcp_ts_offset; |
| 181 | |
| 182 | /* rtcp sender statistics */ |
| 183 | unsigned int packet_count; |
| 184 | unsigned int octet_count; |
| 185 | unsigned int last_octet_count; |
| 186 | int64_t last_feedback_time; |
| 187 | |
| 188 | /* dynamic payload stuff */ |
| 189 | const RTPDynamicProtocolHandler *handler; |
| 190 | PayloadContext *dynamic_protocol_context; |
| 191 | }; |
| 192 | |
| 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); |
| 198 | |
| 199 | /* from rtsp.c, but used by rtp dynamic protocol handlers. */ |
| 200 | int ff_rtsp_next_attr_and_value(const char **p, char *attr, int attr_size, |
| 201 | char *value, int value_size); |
| 202 | |
| 203 | int ff_parse_fmtp(AVFormatContext *s, |
| 204 | AVStream *stream, PayloadContext *data, const char *p, |
| 205 | int (*parse_fmtp)(AVFormatContext *s, |
| 206 | AVStream *stream, |
| 207 | PayloadContext *data, |
| 208 | char *attr, char *value)); |
| 209 | |
| 210 | void ff_register_rtp_dynamic_payload_handlers(void); |
| 211 | |
| 212 | /** |
| 213 | * Close the dynamic buffer and make a packet from it. |
| 214 | */ |
| 215 | int ff_rtp_finalize_packet(AVPacket *pkt, AVIOContext **dyn_buf, int stream_idx); |
| 216 | |
| 217 | #endif /* AVFORMAT_RTPDEC_H */ |