3 * @brief Real-Time Protocol (RTP) demux module for VLC media player
5 /*****************************************************************************
6 * Copyright (C) 2001-2005 the VideoLAN team
7 * Copyright © 2007-2008 Rémi Denis-Courmont
9 * This library is free software; you can redistribute it and/or
10 * modify it under the terms of the GNU General Public License
11 * as published by the Free Software Foundation; either version 2.0
12 * of the License, or (at your option) any later version.
14 * This library is distributed in the hope that it will be useful,
15 * but WITHOUT ANY WARRANTY; without even the implied warranty of
16 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
17 * GNU General Public License for more details.
19 * You should have received a copy of the GNU Lesser General Public
20 * License along with this library; if not, write to the Free Software
21 * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
22 ****************************************************************************/
30 #include <vlc_common.h>
31 #include <vlc_demux.h>
33 #include <vlc_network.h>
34 #include <vlc_plugin.h>
36 #include <vlc_codecs.h>
40 #define RTP_CACHING_TEXT N_("RTP de-jitter buffer length (msec)")
41 #define RTP_CACHING_LONGTEXT N_( \
42 "How long to wait for late RTP packets (and delay the performance)." )
44 #define RTP_MAX_SRC_TEXT N_("Maximum RTP sources")
45 #define RTP_MAX_SRC_LONGTEXT N_( \
46 "How many distinct active RTP sources are allowed at a time." )
48 #define RTP_TIMEOUT_TEXT N_("RTP source timeout (sec)")
49 #define RTP_TIMEOUT_LONGTEXT N_( \
50 "How long to wait for any packet before a source is expired.")
52 #define RTP_MAX_DROPOUT_TEXT N_("Maximum RTP sequence number dropout")
53 #define RTP_MAX_DROPOUT_LONGTEXT N_( \
54 "RTP packets will be discarded if they are too much ahead (i.e. in the " \
55 "future) by this many packets from the last received packet." )
57 #define RTP_MAX_MISORDER_TEXT N_("Maximum RTP sequence number misordering")
58 #define RTP_MAX_MISORDER_LONGTEXT N_( \
59 "RTP packets will be discarded if they are too far behind (i.e. in the " \
60 "past) by this many packets from the last received packet." )
62 static int Open (vlc_object_t *);
63 static void Close (vlc_object_t *);
69 set_shortname (_("RTP"));
70 set_description (_("(Experimental) Real-Time Protocol demuxer"));
71 set_category (CAT_INPUT);
72 set_subcategory (SUBCAT_INPUT_DEMUX);
73 set_capability ("access_demux", 10);
74 set_callbacks (Open, Close);
76 add_integer ("rtp-caching", 1000, NULL, RTP_CACHING_TEXT,
77 RTP_CACHING_LONGTEXT, true);
78 change_integer_range (0, 65535);
79 add_integer ("rtp-max-src", 1, NULL, RTP_MAX_SRC_TEXT,
80 RTP_MAX_SRC_LONGTEXT, true);
81 change_integer_range (1, 255);
82 add_integer ("rtp-timeout", 5, NULL, RTP_TIMEOUT_TEXT,
83 RTP_TIMEOUT_LONGTEXT, true);
84 add_integer ("rtp-max-dropout", 3000, NULL, RTP_MAX_DROPOUT_TEXT,
85 RTP_MAX_DROPOUT_LONGTEXT, true);
86 change_integer_range (0, 32767);
87 add_integer ("rtp-max-misorder", 100, NULL, RTP_MAX_MISORDER_TEXT,
88 RTP_MAX_MISORDER_LONGTEXT, true);
89 change_integer_range (0, 32767);
92 add_shortcut ("udplite");
97 * - send RTCP-RR and RTCP-BYE
98 * - dynamic payload types (need SDP parser)
99 * - multiple medias (need SDP parser, and RTCP-SR parser for lip-sync)
100 * - support for access_filter in case of stream_Demux (MPEG-TS)
104 # define IPPROTO_DCCP 33 /* IANA */
107 #ifndef IPPROTO_UDPLITE
108 # define IPPROTO_UDPLITE 136 /* from IANA */
115 static int Demux (demux_t *);
116 static int Control (demux_t *, int i_query, va_list args);
117 static int extract_port (char **phost);
120 * Probes and initializes.
122 static int Open (vlc_object_t *obj)
124 demux_t *demux = (demux_t *)obj;
125 int tp; /* transport protocol */
127 if (!strcmp (demux->psz_access, "rtp"))
130 if (!strcmp (demux->psz_access, "udplite"))
131 tp = IPPROTO_UDPLITE;
135 char *tmp = strdup (demux->psz_path);
140 char *dhost = strchr (shost, '@');
144 /* Parses the port numbers */
145 int sport = 0, dport = 0;
146 sport = extract_port (&shost);
148 dport = extract_port (&dhost);
150 dport = 5004; /* avt-profile-1 port */
153 int fd = net_OpenDgram (obj, dhost, dport, shost, sport, AF_UNSPEC, tp);
157 net_SetCSCov (fd, -1, 12);
159 /* Initializes demux */
160 demux_sys_t *p_sys = malloc (sizeof (*p_sys));
164 p_sys->caching = var_CreateGetInteger (obj, "rtp-caching");
165 p_sys->max_src = var_CreateGetInteger (obj, "rtp-max-src");
166 p_sys->timeout = var_CreateGetInteger (obj, "rtp-timeout");
167 p_sys->max_dropout = var_CreateGetInteger (obj, "rtp-max-dropout");
168 p_sys->max_misorder = var_CreateGetInteger (obj, "rtp-max-misorder");
169 p_sys->autodetect = true;
171 demux->pf_demux = Demux;
172 demux->pf_control = Control;
173 demux->p_sys = p_sys;
175 p_sys->session = rtp_session_create (demux);
176 if (p_sys->session == NULL)
192 static void Close (vlc_object_t *obj)
194 demux_t *demux = (demux_t *)obj;
195 demux_sys_t *p_sys = demux->p_sys;
197 rtp_session_destroy (demux, p_sys->session);
198 net_Close (p_sys->fd);
204 * Extracts port number from "[host]:port" or "host:port" strings,
205 * and remove brackets from the host name.
206 * @param phost pointer to the string upon entry,
207 * pointer to the hostname upon return.
208 * @return port number, 0 if missing.
210 static int extract_port (char **phost)
212 char *host = *phost, *port;
216 host = *++phost; /* skip '[' */
217 port = strchr (host, ']');
219 *port++ = '\0'; /* skip ']' */
222 port = strchr (host, ':');
226 *port++ = '\0'; /* skip ':' */
234 static int Control (demux_t *demux, int i_query, va_list args)
236 demux_sys_t *p_sys = demux->p_sys;
240 case DEMUX_GET_POSITION:
242 float *v = va_arg (args, float *);
247 case DEMUX_GET_LENGTH:
250 int64_t *v = va_arg (args, int64_t *);
255 case DEMUX_GET_PTS_DELAY:
257 int64_t *v = va_arg (args, int64_t *);
268 * Gets a datagram from the network
270 static block_t *rtp_dgram_recv (demux_t *demux, int fd)
272 block_t *block = block_Alloc (0xffff);
274 ssize_t len = net_Read (VLC_OBJECT (demux), fd, NULL,
275 block->p_buffer, block->i_buffer, false);
278 block_Release (block);
281 return block_Realloc (block, 0, len);
286 * Generic packet handlers
289 static void *codec_init (demux_t *demux, es_format_t *fmt)
291 return es_out_Add (demux->out, fmt);
294 static void codec_destroy (demux_t *demux, void *data)
297 es_out_Del (demux->out, (es_out_id_t *)data);
300 /* Send a packet to decoder */
301 static void codec_decode (demux_t *demux, void *data, block_t *block)
305 block->i_dts = 0; /* RTP does not specify this */
306 es_out_Control (demux->out, ES_OUT_SET_PCR,
307 block->i_pts - demux->p_sys->caching * 1000);
308 es_out_Send (demux->out, (es_out_id_t *)data, block);
311 block_Release (block);
315 static void *stream_init (demux_t *demux, const char *name)
317 return stream_DemuxNew (demux, name, demux->out);
320 static void stream_destroy (demux_t *demux, void *data)
323 stream_DemuxDelete ((stream_t *)data);
327 /* Send a packet to a chained demuxer */
328 static void stream_decode (demux_t *demux, void *data, block_t *block)
331 stream_DemuxSend ((stream_t *)data, block);
333 block_Release (block);
338 * Static payload types handler
344 static void *pcmu_init (demux_t *demux)
348 es_format_Init (&fmt, AUDIO_ES, VLC_FOURCC ('u', 'l', 'a', 'w'));
349 fmt.audio.i_rate = 8000;
350 fmt.audio.i_channels = 1;
351 return codec_init (demux, &fmt);
357 static void *pcma_init (demux_t *demux)
361 es_format_Init (&fmt, AUDIO_ES, VLC_FOURCC ('a', 'l', 'a', 'w'));
362 fmt.audio.i_rate = 8000;
363 fmt.audio.i_channels = 1;
364 return codec_init (demux, &fmt);
368 * MPA: MPEG Audio (RFC2250, §3.4)
370 static void *mpa_init (demux_t *demux)
374 es_format_Init (&fmt, AUDIO_ES, VLC_FOURCC ('m', 'p', 'g', 'a'));
375 fmt.audio.i_channels = 2;
376 return codec_init (demux, &fmt);
379 static void mpa_decode (demux_t *demux, void *data, block_t *block)
381 if (block->i_buffer < 4)
383 block_Release (block);
387 block->i_buffer -= 4; /* 32-bits RTP/MPA header */
388 block->p_buffer += 4;
390 codec_decode (demux, data, block);
395 * MPV: MPEG Video (RFC2250, §3.5)
397 static void *mpv_init (demux_t *demux)
401 es_format_Init (&fmt, VIDEO_ES, VLC_FOURCC ('m', 'p', 'g', 'v'));
402 return codec_init (demux, &fmt);
405 static void mpv_decode (demux_t *demux, void *data, block_t *block)
407 if (block->i_buffer < 4)
409 block_Release (block);
413 block->i_buffer -= 4; /* 32-bits RTP/MPV header */
414 block->p_buffer += 4;
416 if (block->p_buffer[-3] & 0x4)
418 /* MPEG2 Video extension header */
419 /* TODO: shouldn't we skip this too ? */
422 codec_decode (demux, data, block);
427 * MP2: MPEG TS (RFC2250, §2)
429 static void *ts_init (demux_t *demux)
431 return stream_init (demux, "ts");
436 * Dynamic payload type handlers
437 * Hmm, none implemented yet.
441 * Processing callback
443 static int Demux (demux_t *demux)
445 demux_sys_t *p_sys = demux->p_sys;
448 block = rtp_dgram_recv (demux, p_sys->fd);
451 /* Not using SDP, we need to guess the payload format used */
452 if (p_sys->autodetect && block->i_buffer >= 2)
456 .destroy = codec_destroy,
457 .decode = codec_decode,
459 .number = block->p_buffer[1] & 0x7f,
465 msg_Dbg (demux, "detected G.711 mu-law");
471 msg_Dbg (demux, "detected G.711 A-law");
477 msg_Dbg (demux, "detected MPEG Audio");
479 pt.decode = mpa_decode;
480 pt.frequency = 44100;
484 msg_Dbg (demux, "detected MPEG Video");
486 pt.decode = mpv_decode;
487 pt.frequency = 90000;
491 msg_Dbg (demux, "detected MPEG2 TS");
493 pt.destroy = stream_destroy;
494 pt.decode = stream_decode;
495 pt.frequency = 90000;
498 case 72: /* muxed SR */
499 case 73: /* muxed RR */
500 case 74: /* muxed SDES */
501 case 75: /* muxed BYE */
502 case 76: /* muxed APP */
504 block_Release (block); /* ooh! ignoring RTCP is evil! */
507 rtp_add_type (demux, p_sys->session, &pt);
508 p_sys->autodetect = false;
511 rtp_receive (demux, p_sys->session, block);