1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
|
/*
* RTP demuxer definitions
* Copyright (c) 2002 Fabrice Bellard
* Copyright (c) 2006 Ryan Martell <rdm4@martellventures.com>
*
* This file is part of Libav.
*
* Libav is free software; you can redistribute it and/or
* modify it under the terms of the GNU Lesser General Public
* License as published by the Free Software Foundation; either
* version 2.1 of the License, or (at your option) any later version.
*
* Libav is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
* Lesser General Public License for more details.
*
* You should have received a copy of the GNU Lesser General Public
* License along with Libav; if not, write to the Free Software
* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
*/
#ifndef AVFORMAT_RTPDEC_H
#define AVFORMAT_RTPDEC_H
#include "libavcodec/avcodec.h"
#include "avformat.h"
#include "rtp.h"
#include "url.h"
typedef struct PayloadContext PayloadContext;
typedef struct RTPDynamicProtocolHandler RTPDynamicProtocolHandler;
#define RTP_MIN_PACKET_LENGTH 12
#define RTP_MAX_PACKET_LENGTH 1500
#define RTP_REORDER_QUEUE_DEFAULT_SIZE 10
#define RTP_NOTS_VALUE ((uint32_t)-1)
typedef struct RTPDemuxContext RTPDemuxContext;
RTPDemuxContext *ff_rtp_parse_open(AVFormatContext *s1, AVStream *st,
int payload_type, int queue_size);
void ff_rtp_parse_set_dynamic_protocol(RTPDemuxContext *s, PayloadContext *ctx,
RTPDynamicProtocolHandler *handler);
int ff_rtp_parse_packet(RTPDemuxContext *s, AVPacket *pkt,
uint8_t **buf, int len);
void ff_rtp_parse_close(RTPDemuxContext *s);
int64_t ff_rtp_queued_packet_time(RTPDemuxContext *s);
void ff_rtp_reset_packet_queue(RTPDemuxContext *s);
int ff_rtp_get_local_rtp_port(URLContext *h);
int ff_rtp_get_local_rtcp_port(URLContext *h);
int ff_rtp_set_remote_url(URLContext *h, const char *uri);
/**
* Send a dummy packet on both port pairs to set up the connection
* state in potential NAT routers, so that we're able to receive
* packets.
*
* Note, this only works if the NAT router doesn't remap ports. This
* isn't a standardized procedure, but it works in many cases in practice.
*
* The same routine is used with RDT too, even if RDT doesn't use normal
* RTP packets otherwise.
*/
void ff_rtp_send_punch_packets(URLContext* rtp_handle);
/**
* some rtp servers assume client is dead if they don't hear from them...
* so we send a Receiver Report to the provided URLContext or AVIOContext
* (we don't have access to the rtcp handle from here)
*/
int ff_rtp_check_and_send_back_rr(RTPDemuxContext *s, URLContext *fd,
AVIOContext *avio, int count);
// these statistics are used for rtcp receiver reports...
typedef struct RTPStatistics {
uint16_t max_seq; ///< highest sequence number seen
uint32_t cycles; ///< shifted count of sequence number cycles
uint32_t base_seq; ///< base sequence number
uint32_t bad_seq; ///< last bad sequence number + 1
int probation; ///< sequence packets till source is valid
int received; ///< packets received
int expected_prior; ///< packets expected in last interval
int received_prior; ///< packets received in last interval
uint32_t transit; ///< relative transit time for previous packet
uint32_t jitter; ///< estimated jitter.
} RTPStatistics;
#define RTP_FLAG_KEY 0x1 ///< RTP packet contains a keyframe
#define RTP_FLAG_MARKER 0x2 ///< RTP marker bit was set for this packet
/**
* Packet parsing for "private" payloads in the RTP specs.
*
* @param ctx RTSP demuxer context
* @param s stream context
* @param st stream that this packet belongs to
* @param pkt packet in which to write the parsed data
* @param timestamp pointer to the RTP timestamp of the input data, can be
* updated by the function if returning older, buffered data
* @param buf pointer to raw RTP packet data
* @param len length of buf
* @param seq RTP sequence number of the packet
* @param flags flags from the RTP packet header (RTP_FLAG_*)
*/
typedef int (*DynamicPayloadPacketHandlerProc)(AVFormatContext *ctx,
PayloadContext *s,
AVStream *st, AVPacket *pkt,
uint32_t *timestamp,
const uint8_t * buf,
int len, uint16_t seq, int flags);
struct RTPDynamicProtocolHandler {
const char enc_name[50];
enum AVMediaType codec_type;
enum AVCodecID codec_id;
int static_payload_id; /* 0 means no payload id is set. 0 is a valid
* payload ID (PCMU), too, but that format doesn't
* require any custom depacketization code. */
/** Initialize dynamic protocol handler, called after the full rtpmap line is parsed, may be null */
int (*init)(AVFormatContext *s, int st_index, PayloadContext *priv_data);
/** Parse the a= line from the sdp field */
int (*parse_sdp_a_line)(AVFormatContext *s, int st_index,
PayloadContext *priv_data, const char *line);
/** Allocate any data needed by the rtp parsing for this dynamic data. */
PayloadContext *(*alloc)(void);
/** Free any data needed by the rtp parsing for this dynamic data. */
void (*free)(PayloadContext *protocol_data);
/** Parse handler for this dynamic packet */
DynamicPayloadPacketHandlerProc parse_packet;
struct RTPDynamicProtocolHandler *next;
};
typedef struct RTPPacket {
uint16_t seq;
uint8_t *buf;
int len;
int64_t recvtime;
struct RTPPacket *next;
} RTPPacket;
struct RTPDemuxContext {
AVFormatContext *ic;
AVStream *st;
int payload_type;
uint32_t ssrc;
uint16_t seq;
uint32_t timestamp;
uint32_t base_timestamp;
uint32_t cur_timestamp;
int64_t unwrapped_timestamp;
int64_t range_start_offset;
int max_payload_size;
struct MpegTSContext *ts; /* only used for MP2T payloads */
int read_buf_index;
int read_buf_size;
/* used to send back RTCP RR */
char hostname[256];
/** Statistics for this stream (used by RTCP receiver reports) */
RTPStatistics statistics;
/** Fields for packet reordering @{ */
int prev_ret; ///< The return value of the actual parsing of the previous packet
RTPPacket* queue; ///< A sorted queue of buffered packets not yet returned
int queue_len; ///< The number of packets in queue
int queue_size; ///< The size of queue, or 0 if reordering is disabled
/*@}*/
/* rtcp sender statistics receive */
int64_t last_rtcp_ntp_time;
int64_t first_rtcp_ntp_time;
uint32_t last_rtcp_timestamp;
int64_t rtcp_ts_offset;
/* rtcp sender statistics */
unsigned int packet_count;
unsigned int octet_count;
unsigned int last_octet_count;
/* buffer for partially parsed packets */
uint8_t buf[RTP_MAX_PACKET_LENGTH];
/* dynamic payload stuff */
DynamicPayloadPacketHandlerProc parse_packet;
PayloadContext *dynamic_protocol_context;
};
void ff_register_dynamic_payload_handler(RTPDynamicProtocolHandler *handler);
RTPDynamicProtocolHandler *ff_rtp_handler_find_by_name(const char *name,
enum AVMediaType codec_type);
RTPDynamicProtocolHandler *ff_rtp_handler_find_by_id(int id,
enum AVMediaType codec_type);
/* from rtsp.c, but used by rtp dynamic protocol handlers. */
int ff_rtsp_next_attr_and_value(const char **p, char *attr, int attr_size,
char *value, int value_size);
int ff_parse_fmtp(AVStream *stream, PayloadContext *data, const char *p,
int (*parse_fmtp)(AVStream *stream,
PayloadContext *data,
char *attr, char *value));
void av_register_rtp_dynamic_payload_handlers(void);
/**
* Close the dynamic buffer and make a packet from it.
*/
int ff_rtp_finalize_packet(AVPacket *pkt, AVIOContext **dyn_buf, int stream_idx);
#endif /* AVFORMAT_RTPDEC_H */
|
