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rtp.h
Go to the documentation of this file.
1
13#ifndef JANUS_RTP_H
14#define JANUS_RTP_H
15
16#include <arpa/inet.h>
17#if defined (__MACH__) || defined(__FreeBSD__)
18#include <machine/endian.h>
19#define __BYTE_ORDER BYTE_ORDER
20#define __BIG_ENDIAN BIG_ENDIAN
21#define __LITTLE_ENDIAN LITTLE_ENDIAN
22#else
23#include <endian.h>
24#endif
25#include <inttypes.h>
26#include <string.h>
27#include <glib.h>
28#include <jansson.h>
29
30#include "plugins/plugin.h"
31#include "utils.h"
32
33#define RTP_HEADER_SIZE 12
34
36typedef struct rtp_header
37{
38#if __BYTE_ORDER == __BIG_ENDIAN
39 uint16_t version:2;
40 uint16_t padding:1;
41 uint16_t extension:1;
42 uint16_t csrccount:4;
43 uint16_t markerbit:1;
44 uint16_t type:7;
45#elif __BYTE_ORDER == __LITTLE_ENDIAN
46 uint16_t csrccount:4;
47 uint16_t extension:1;
48 uint16_t padding:1;
49 uint16_t version:2;
50 uint16_t type:7;
51 uint16_t markerbit:1;
52#endif
53 uint16_t seq_number;
54 uint32_t timestamp;
55 uint32_t ssrc;
56 uint32_t csrc[0];
59
68
74
77#if __BYTE_ORDER == __BIG_ENDIAN
78 uint8_t event;
79 uint8_t end:1;
80 uint8_t reserved:1;
81 uint8_t volume:6;
82 uint16_t duration;
83#elif __BYTE_ORDER == __LITTLE_ENDIAN
84 uint8_t event;
85 uint8_t volume:6;
86 uint8_t reserved:1;
87 uint8_t end:1;
88 uint16_t duration;
89#endif
91
93#define JANUS_RTP_EXTMAP_AUDIO_LEVEL "urn:ietf:params:rtp-hdrext:ssrc-audio-level"
95#define JANUS_RTP_EXTMAP_TOFFSET "urn:ietf:params:rtp-hdrext:toffset"
97#define JANUS_RTP_EXTMAP_ABS_SEND_TIME "http://www.webrtc.org/experiments/rtp-hdrext/abs-send-time"
99#define JANUS_RTP_EXTMAP_ABS_CAPTURE_TIME "http://www.webrtc.org/experiments/rtp-hdrext/abs-capture-time"
101#define JANUS_RTP_EXTMAP_VIDEO_ORIENTATION "urn:3gpp:video-orientation"
103#define JANUS_RTP_EXTMAP_TRANSPORT_WIDE_CC "http://www.ietf.org/id/draft-holmer-rmcat-transport-wide-cc-extensions-01"
105#define JANUS_RTP_EXTMAP_PLAYOUT_DELAY "http://www.webrtc.org/experiments/rtp-hdrext/playout-delay"
107#define JANUS_RTP_EXTMAP_MID "urn:ietf:params:rtp-hdrext:sdes:mid"
109#define JANUS_RTP_EXTMAP_RID "urn:ietf:params:rtp-hdrext:sdes:rtp-stream-id"
111#define JANUS_RTP_EXTMAP_REPAIRED_RID "urn:ietf:params:rtp-hdrext:sdes:repaired-rtp-stream-id"
113#define JANUS_RTP_EXTMAP_DEPENDENCY_DESC "https://aomediacodec.github.io/av1-rtp-spec/#dependency-descriptor-rtp-header-extension"
115#define JANUS_RTP_EXTMAP_ENCRYPTED "urn:ietf:params:rtp-hdrext:encrypt"
116int janus_rtp_extension_id(const char *type);
117
118
132const char *janus_audiocodec_name(janus_audiocodec acodec);
135
144const char *janus_videocodec_name(janus_videocodec vcodec);
147
148
152gboolean janus_is_rtp(char *buf, guint len);
153
159char *janus_rtp_payload(char *buf, int len, int *plen);
160
165int janus_rtp_header_extension_get_id(const char *sdp, const char *extension);
166
172const char *janus_rtp_header_extension_get_from_id(const char *sdp, int id);
173
183int janus_rtp_header_extension_parse_audio_level(char *buf, int len, int id, gboolean *vad, int *level);
184
194int janus_rtp_header_extension_parse_video_orientation(char *buf, int len, int id,
195 gboolean *c, gboolean *f, gboolean *r1, gboolean *r0);
196
204int janus_rtp_header_extension_parse_playout_delay(char *buf, int len, int id,
205 uint16_t *min_delay, uint16_t *max_delay);
206
214int janus_rtp_header_extension_parse_mid(char *buf, int len, int id,
215 char *sdes_item, int sdes_len);
216
224int janus_rtp_header_extension_parse_rid(char *buf, int len, int id,
225 char *sdes_item, int sdes_len);
226
234int janus_rtp_header_extension_parse_dependency_desc(char *buf, int len, int id,
235 uint8_t *dd_item, int *dd_len);
236
243int janus_rtp_header_extension_parse_abs_send_time(char *buf, int len, int id, uint32_t *abs_ts);
244
251int janus_rtp_header_extension_set_abs_send_time(char *buf, int len, int id, uint32_t abs_ts);
252
259int janus_rtp_header_extension_parse_abs_capture_time(char *buf, int len, int id, uint64_t *abs_ts);
260
267int janus_rtp_header_extension_set_abs_capture_time(char *buf, int len, int id, uint64_t abs_ts);
268
275int janus_rtp_header_extension_parse_transport_wide_cc(char *buf, int len, int id, uint16_t *transSeqNum);
276
283int janus_rtp_header_extension_set_transport_wide_cc(char *buf, int len, int id, uint16_t transSeqNum);
284
292int janus_rtp_header_extension_replace_id(char *buf, int len, int id, int new_id);
293
303
307
313void janus_rtp_header_update(janus_rtp_header *header, janus_rtp_switching_context *context, gboolean video, int step);
314
315#define RTP_AUDIO_SKEW_TH_MS 120
316#define RTP_VIDEO_SKEW_TH_MS 120
317#define SKEW_DETECTION_WAIT_TIME_SECS 10
318
331
332
336
349
361
365
378 uint8_t *dd, int dd_len, uint8_t *template_id, uint8_t *ebit);
380
384
409
413
420void janus_rtp_simulcasting_prepare(json_t *simulcast, int *rid_ext_id, uint32_t *ssrcs, char **rids);
421
428void janus_rtp_simulcasting_cleanup(int *rid_ext_id, uint32_t *ssrcs, char **rids, janus_mutex *rid_mutex);
429
445 char *buf, int len, uint8_t *dd_content, int dd_len, uint32_t *ssrcs, char **rids,
448
452
475
479
493 char *buf, int len, uint8_t *dd_content, int dd_len,
496
497#endif
GMutex janus_mutex
Janus mutex implementation.
Definition mutex.h:73
Plugin-Core communication (implementation)
struct json_t json_t
Definition plugin.h:236
const char * janus_videocodec_name(janus_videocodec vcodec)
Definition rtp.c:1002
int janus_rtp_header_extension_set_abs_send_time(char *buf, int len, int id, uint32_t abs_ts)
Helper to set an abs-send-time RTP extension (http://www.webrtc.org/experiments/rtp-hdrext/abs-send-t...
Definition rtp.c:354
struct janus_rtp_packet janus_rtp_packet
RTP packet.
int janus_rtp_skew_compensate_audio(janus_rtp_header *header, janus_rtp_switching_context *context, gint64 now)
Use the context info to compensate for audio source skew, if needed.
Definition rtp.c:532
struct janus_rtp_header_extension janus_rtp_header_extension
RTP extension.
void janus_rtp_header_update(janus_rtp_header *header, janus_rtp_switching_context *context, gboolean video, int step)
Use the context info to update the RTP header of a packet, if needed.
Definition rtp.c:762
void janus_av1_svc_context_reset(janus_av1_svc_context *context)
Set (or reset) the context fields to their default values.
Definition rtp.c:1595
gboolean janus_av1_svc_context_process_dd(janus_av1_svc_context *context, uint8_t *dd, int dd_len, uint8_t *template_id, uint8_t *ebit)
Process a Dependency Descriptor payload, updating the SVC context accordingly.
Definition rtp.c:1604
struct janus_rtp_switching_context janus_rtp_switching_context
RTP context, in order to make sure SSRC changes result in coherent seq/ts increases.
void janus_rtp_switching_context_reset(janus_rtp_switching_context *context)
Set (or reset) the context fields to their default values.
Definition rtp.c:525
janus_audiocodec
Definition rtp.h:119
@ JANUS_AUDIOCODEC_PCMU
Definition rtp.h:124
@ JANUS_AUDIOCODEC_MULTIOPUS
Definition rtp.h:122
@ JANUS_AUDIOCODEC_L16_48K
Definition rtp.h:129
@ JANUS_AUDIOCODEC_OPUSRED
Definition rtp.h:123
@ JANUS_AUDIOCODEC_NONE
Definition rtp.h:120
@ JANUS_AUDIOCODEC_ISAC_32K
Definition rtp.h:127
@ JANUS_AUDIOCODEC_L16_16K
Definition rtp.h:130
@ JANUS_AUDIOCODEC_G722
Definition rtp.h:126
@ JANUS_AUDIOCODEC_OPUS
Definition rtp.h:121
@ JANUS_AUDIOCODEC_PCMA
Definition rtp.h:125
@ JANUS_AUDIOCODEC_ISAC_16K
Definition rtp.h:128
void janus_rtp_simulcasting_context_reset(janus_rtp_simulcasting_context *context)
Set (or reset) the context fields to their default values.
Definition rtp.c:1057
janus_audiocodec janus_audiocodec_from_name(const char *name)
Definition rtp.c:946
int janus_rtp_header_extension_parse_dependency_desc(char *buf, int len, int id, uint8_t *dd_item, int *dd_len)
Helper to parse a dependency descriptor RTP extension (https://aomediacodec.github....
Definition rtp.c:314
void janus_rtp_simulcasting_cleanup(int *rid_ext_id, uint32_t *ssrcs, char **rids, janus_mutex *rid_mutex)
Helper method to cleanup some or all of the simulcasting info (rids and/or SSRCs) we may have prepare...
Definition rtp.c:1101
int janus_rtp_header_extension_replace_id(char *buf, int len, int id, int new_id)
Helper to replace the ID of an RTP extension with a different one (e.g., to turn a repaired-rtp-strea...
Definition rtp.c:433
gboolean janus_rtp_svc_context_process_rtp(janus_rtp_svc_context *context, char *buf, int len, uint8_t *dd_content, int dd_len, janus_videocodec vcodec, janus_vp9_svc_info *info, janus_rtp_switching_context *sc)
Process an RTP packet, and decide whether this should be relayed or not, updating the context accordi...
Definition rtp.c:1360
int janus_rtp_header_extension_set_transport_wide_cc(char *buf, int len, int id, uint16_t transSeqNum)
Helper to set a transport wide sequence number (https://tools.ietf.org/html/draft-holmer-rmcat-transp...
Definition rtp.c:419
janus_videocodec
Definition rtp.h:136
@ JANUS_VIDEOCODEC_NONE
Definition rtp.h:137
@ JANUS_VIDEOCODEC_H264
Definition rtp.h:140
@ JANUS_VIDEOCODEC_AV1
Definition rtp.h:141
@ JANUS_VIDEOCODEC_VP9
Definition rtp.h:139
@ JANUS_VIDEOCODEC_VP8
Definition rtp.h:138
@ JANUS_VIDEOCODEC_H265
Definition rtp.h:142
const char * janus_rtp_header_extension_get_from_id(const char *sdp, int id)
Ugly and dirty helper to quickly get the RTP extension namespace associated with an id (extmap) in an...
Definition rtp.c:80
int janus_videocodec_pt(janus_videocodec vcodec)
Definition rtp.c:1037
int janus_rtp_header_extension_parse_playout_delay(char *buf, int len, int id, uint16_t *min_delay, uint16_t *max_delay)
Helper to parse a playout-delay RTP extension (https://webrtc.org/experiments/rtp-hdrext/playout-dela...
Definition rtp.c:252
int janus_rtp_header_extension_parse_transport_wide_cc(char *buf, int len, int id, uint16_t *transSeqNum)
Helper to parse a transport wide sequence number (https://tools.ietf.org/html/draft-holmer-rmcat-tran...
Definition rtp.c:399
char * janus_rtp_payload(char *buf, int len, int *plen)
Helper to quickly access the RTP payload, skipping header and extensions.
Definition rtp.c:25
rtp_header janus_rtp_header
Definition rtp.h:58
int janus_rtp_header_extension_parse_mid(char *buf, int len, int id, char *sdes_item, int sdes_len)
Helper to parse a sdes-mid RTP extension (https://tools.ietf.org/html/draft-ietf-mmusic-sdp-bundle-ne...
Definition rtp.c:271
struct janus_rtp_rfc2833_payload janus_rtp_rfc2833_payload
RTP RFC2833 payload.
struct janus_av1_svc_template janus_av1_svc_template
Helper struct to track SVC templates.
struct janus_rtp_svc_context janus_rtp_svc_context
Helper struct for processing and tracking VP9-SVC streams.
int janus_rtp_header_extension_parse_abs_capture_time(char *buf, int len, int id, uint64_t *abs_ts)
Helper to parse an abs-capture-time RTP extension (http://www.webrtc.org/experiments/rtp-hdrext/abs-c...
Definition rtp.c:368
janus_videocodec janus_videocodec_from_name(const char *name)
Definition rtp.c:1021
int janus_rtp_header_extension_set_abs_capture_time(char *buf, int len, int id, uint64_t abs_ts)
Helper to set an abs-capture-time RTP extension (http://www.webrtc.org/experiments/rtp-hdrext/abs-cap...
Definition rtp.c:385
int janus_rtp_header_extension_parse_rid(char *buf, int len, int id, char *sdes_item, int sdes_len)
Helper to parse a rtp-stream-id RTP extension (https://tools.ietf.org/html/draft-ietf-avtext-rid-09)
Definition rtp.c:292
int janus_rtp_header_extension_parse_video_orientation(char *buf, int len, int id, gboolean *c, gboolean *f, gboolean *r1, gboolean *r0)
Helper to parse a video-orientation RTP extension (http://www.3gpp.org/ftp/Specs/html-info/26114....
Definition rtp.c:230
struct rtp_header rtp_header
RTP Header (http://tools.ietf.org/html/rfc3550#section-5.1)
void janus_rtp_simulcasting_prepare(json_t *simulcast, int *rid_ext_id, uint32_t *ssrcs, char **rids)
Helper method to prepare the simulcasting info (rids and/or SSRCs) from the simulcast object the core...
Definition rtp.c:1071
const char * janus_audiocodec_name(janus_audiocodec acodec)
Definition rtp.c:917
struct janus_av1_svc_context janus_av1_svc_context
Helper struct for processing and tracking AV1-SVC streams.
int janus_rtp_header_extension_parse_abs_send_time(char *buf, int len, int id, uint32_t *abs_ts)
Helper to parse an abs-send-time RTP extension (http://www.webrtc.org/experiments/rtp-hdrext/abs-send...
Definition rtp.c:337
int janus_audiocodec_pt(janus_audiocodec acodec)
Definition rtp.c:972
gboolean janus_is_rtp(char *buf, guint len)
Helper method to demultiplex RTP from other protocols.
Definition rtp.c:18
int janus_rtp_header_extension_get_id(const char *sdp, const char *extension)
Ugly and dirty helper to quickly get the id associated with an RTP extension (extmap) in an SDP.
Definition rtp.c:51
struct janus_rtp_simulcasting_context janus_rtp_simulcasting_context
Helper struct for processing and tracking simulcast streams.
void janus_rtp_svc_context_reset(janus_rtp_svc_context *context)
Set (or reset) the context fields to their default values.
Definition rtp.c:1350
int janus_rtp_header_extension_parse_audio_level(char *buf, int len, int id, gboolean *vad, int *level)
Helper to parse a ssrc-audio-level RTP extension (https://tools.ietf.org/html/rfc6464)
Definition rtp.c:215
gboolean janus_rtp_simulcasting_context_process_rtp(janus_rtp_simulcasting_context *context, char *buf, int len, uint8_t *dd_content, int dd_len, uint32_t *ssrcs, char **rids, janus_videocodec vcodec, janus_rtp_switching_context *sc, janus_mutex *rid_mutex)
Process an RTP packet, and decide whether this should be relayed or not, updating the context accordi...
Definition rtp.c:1121
int janus_rtp_extension_id(const char *type)
Definition rtp.c:498
int janus_rtp_skew_compensate_video(janus_rtp_header *header, janus_rtp_switching_context *context, gint64 now)
Use the context info to compensate for video source skew, if needed.
Definition rtp.c:648
Helper struct for processing and tracking AV1-SVC streams.
Definition rtp.h:337
uint8_t tcnt
Number of templates advertised via Dependency Descriptor.
Definition rtp.h:339
int spatial_layers
How many spatial and temporal layers are available.
Definition rtp.h:345
GHashTable * templates
Map of templates advertised via Dependency Descriptor, indexed by ID.
Definition rtp.h:343
gboolean updated
Whether this context changed since the last update.
Definition rtp.h:347
uint8_t tioff
Template ID offset, as advertised via Dependency Descriptor.
Definition rtp.h:341
int temporal_layers
Definition rtp.h:345
Helper struct to track SVC templates.
Definition rtp.h:353
uint8_t id
Template ID.
Definition rtp.h:355
int spatial
Spatial layer associated to this template.
Definition rtp.h:357
int temporal
Temporal layer associated to this template.
Definition rtp.h:359
Janus plugin RTP extensions.
Definition plugin.h:562
RTP extension.
Definition rtp.h:70
uint16_t length
Definition rtp.h:72
uint16_t type
Definition rtp.h:71
RTP packet.
Definition rtp.h:61
char * data
Definition rtp.h:62
gint64 last_retransmit
Definition rtp.h:65
gint length
Definition rtp.h:63
gint64 created
Definition rtp.h:64
janus_plugin_rtp_extensions extensions
Definition rtp.h:66
RTP RFC2833 payload.
Definition rtp.h:76
uint8_t end
Definition rtp.h:79
uint16_t duration
Definition rtp.h:82
uint8_t event
Definition rtp.h:78
uint8_t reserved
Definition rtp.h:80
uint8_t volume
Definition rtp.h:81
Helper struct for processing and tracking simulcast streams.
Definition rtp.h:385
gboolean changed_temporal
Whether the temporal layer has changed after processing a packet.
Definition rtp.h:405
int templayer_target
As above, but to handle transitions (e.g., wait for keyframe)
Definition rtp.h:397
int substream_target
As above, but to handle transitions (e.g., wait for keyframe, or get this if available)
Definition rtp.h:393
gint rid_ext_id
RTP Stream extension ID, if any.
Definition rtp.h:387
gboolean changed_substream
Whether the substream has changed after processing a packet.
Definition rtp.h:403
guint32 drop_trigger
How much time (in us, default 250000) without receiving packets will make us drop to the substream be...
Definition rtp.h:399
int substream_target_temp
Definition rtp.h:393
int templayer
Which simulcast temporal layer we should forward back.
Definition rtp.h:395
int substream
Which simulcast substream we should forward back.
Definition rtp.h:391
gboolean need_pli
Whether we need to send the user a keyframe request (PLI)
Definition rtp.h:407
janus_av1_svc_context av1_context[3]
Dependency Descriptors contexts, if any.
Definition rtp.h:389
gint64 last_relayed
When we relayed the last packet (used to detect when substreams become unavailable)
Definition rtp.h:401
Helper struct for processing and tracking VP9-SVC streams.
Definition rtp.h:453
guint32 drop_trigger
How much time (in us, default 250000) without receiving packets will make us drop to the substream be...
Definition rtp.h:465
gboolean changed_spatial
Whether the spatial layer has changed after processing a packet.
Definition rtp.h:469
int temporal_target
As above, but to handle transitions (e.g., wait for keyframe)
Definition rtp.h:463
gboolean changed_temporal
Whether the temporal layer has changed after processing a packet.
Definition rtp.h:471
struct janus_av1_svc_context dd_context
Dependency Descriptor context, in case it's needed.
Definition rtp.h:455
int temporal
Which SVC temporal layer we should forward back.
Definition rtp.h:461
int spatial_target
As above, but to handle transitions (e.g., wait for keyframe, or get this if available)
Definition rtp.h:459
int spatial
Which SVC spatial layer we should forward back.
Definition rtp.h:457
gboolean need_pli
Whether we need to send the user a keyframe request (PLI)
Definition rtp.h:473
gint64 last_spatial_layer[3]
When we relayed the last packet (used to detect when layers become unavailable)
Definition rtp.h:467
RTP context, in order to make sure SSRC changes result in coherent seq/ts increases.
Definition rtp.h:295
uint32_t prev_ts
Definition rtp.h:296
uint32_t last_ssrc
Definition rtp.h:296
gint64 reference_time
Definition rtp.h:301
uint32_t start_ts
Definition rtp.h:296
uint16_t base_seq
Definition rtp.h:297
uint32_t target_ts
Definition rtp.h:296
gint64 evaluating_start_time
Definition rtp.h:301
gboolean ts_reset
Definition rtp.h:298
uint32_t base_ts
Definition rtp.h:296
uint16_t prev_seq
Definition rtp.h:297
uint16_t last_seq
Definition rtp.h:297
gboolean new_ssrc
Definition rtp.h:298
gint32 prev_delay
Definition rtp.h:300
gint32 active_delay
Definition rtp.h:300
uint32_t last_ts
Definition rtp.h:296
gint16 seq_offset
Definition rtp.h:299
gint64 start_time
Definition rtp.h:301
gint64 last_time
Definition rtp.h:301
uint32_t base_ts_prev
Definition rtp.h:296
gboolean seq_reset
Definition rtp.h:298
uint16_t base_seq_prev
Definition rtp.h:297
gint32 ts_offset
Definition rtp.h:300
VP9 SVC info, as parsed from a payload descriptor.
Definition utils.h:400
RTP Header (http://tools.ietf.org/html/rfc3550#section-5.1)
Definition rtp.h:37
uint32_t csrc[0]
Definition rtp.h:56
uint16_t extension
Definition rtp.h:41
uint32_t timestamp
Definition rtp.h:54
uint16_t padding
Definition rtp.h:40
uint16_t csrccount
Definition rtp.h:42
uint16_t type
Definition rtp.h:44
uint32_t ssrc
Definition rtp.h:55
uint16_t seq_number
Definition rtp.h:53
uint16_t version
Definition rtp.h:39
uint16_t markerbit
Definition rtp.h:43
TURN REST API client.