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