Implement RDTDemuxContext, which contains RDT-specific data (similar to
[libav.git] / libavformat / rtsp.c
1 /*
2 * RTSP/SDP client
3 * Copyright (c) 2002 Fabrice Bellard.
4 *
5 * This file is part of FFmpeg.
6 *
7 * FFmpeg is free software; you can redistribute it and/or
8 * modify it under the terms of the GNU Lesser General Public
9 * License as published by the Free Software Foundation; either
10 * version 2.1 of the License, or (at your option) any later version.
11 *
12 * FFmpeg is distributed in the hope that it will be useful,
13 * but WITHOUT ANY WARRANTY; without even the implied warranty of
14 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
15 * Lesser General Public License for more details.
16 *
17 * You should have received a copy of the GNU Lesser General Public
18 * License along with FFmpeg; if not, write to the Free Software
19 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
20 */
21
22 /* needed by inet_aton() */
23 #define _SVID_SOURCE
24
25 #include "libavutil/avstring.h"
26 #include "avformat.h"
27
28 #include <sys/time.h>
29 #ifdef HAVE_SYS_SELECT_H
30 #include <sys/select.h>
31 #endif
32 #include <strings.h>
33 #include "network.h"
34 #include "rtsp.h"
35
36 #include "rtp_internal.h"
37 #include "rdt.h"
38
39 //#define DEBUG
40 //#define DEBUG_RTP_TCP
41
42 enum RTSPClientState {
43 RTSP_STATE_IDLE,
44 RTSP_STATE_PLAYING,
45 RTSP_STATE_PAUSED,
46 };
47
48 enum RTSPServerType {
49 RTSP_SERVER_RTP, /*< Standard-compliant RTP-server */
50 RTSP_SERVER_REAL, /*< Realmedia-style server */
51 RTSP_SERVER_LAST
52 };
53
54 enum RTSPTransport {
55 RTSP_TRANSPORT_RTP,
56 RTSP_TRANSPORT_RDT,
57 RTSP_TRANSPORT_LAST
58 };
59
60 typedef struct RTSPState {
61 URLContext *rtsp_hd; /* RTSP TCP connexion handle */
62 int nb_rtsp_streams;
63 struct RTSPStream **rtsp_streams;
64
65 enum RTSPClientState state;
66 int64_t seek_timestamp;
67
68 /* XXX: currently we use unbuffered input */
69 // ByteIOContext rtsp_gb;
70 int seq; /* RTSP command sequence number */
71 char session_id[512];
72 enum RTSPTransport transport;
73 enum RTSPLowerTransport lower_transport;
74 enum RTSPServerType server_type;
75 char last_reply[2048]; /* XXX: allocate ? */
76 void *cur_tx;
77 int need_subscription;
78 } RTSPState;
79
80 typedef struct RTSPStream {
81 URLContext *rtp_handle; /* RTP stream handle */
82 void *tx_ctx; /* RTP/RDT parse context */
83
84 int stream_index; /* corresponding stream index, if any. -1 if none (MPEG2TS case) */
85 int interleaved_min, interleaved_max; /* interleave ids, if TCP transport */
86 char control_url[1024]; /* url for this stream (from SDP) */
87
88 int sdp_port; /* port (from SDP content - not used in RTSP) */
89 struct in_addr sdp_ip; /* IP address (from SDP content - not used in RTSP) */
90 int sdp_ttl; /* IP TTL (from SDP content - not used in RTSP) */
91 int sdp_payload_type; /* payload type - only used in SDP */
92 rtp_payload_data_t rtp_payload_data; /* rtp payload parsing infos from SDP */
93
94 RTPDynamicProtocolHandler *dynamic_handler; ///< Only valid if it's a dynamic protocol. (This is the handler structure)
95 PayloadContext *dynamic_protocol_context; ///< Only valid if it's a dynamic protocol. (This is any private data associated with the dynamic protocol)
96 } RTSPStream;
97
98 static int rtsp_read_play(AVFormatContext *s);
99
100 /* XXX: currently, the only way to change the protocols consists in
101 changing this variable */
102
103 #if LIBAVFORMAT_VERSION_INT < (53 << 16)
104 int rtsp_default_protocols = (1 << RTSP_LOWER_TRANSPORT_UDP);
105 #endif
106
107 static int rtsp_probe(AVProbeData *p)
108 {
109 if (av_strstart(p->filename, "rtsp:", NULL))
110 return AVPROBE_SCORE_MAX;
111 return 0;
112 }
113
114 static int redir_isspace(int c)
115 {
116 return c == ' ' || c == '\t' || c == '\n' || c == '\r';
117 }
118
119 static void skip_spaces(const char **pp)
120 {
121 const char *p;
122 p = *pp;
123 while (redir_isspace(*p))
124 p++;
125 *pp = p;
126 }
127
128 static void get_word_sep(char *buf, int buf_size, const char *sep,
129 const char **pp)
130 {
131 const char *p;
132 char *q;
133
134 p = *pp;
135 if (*p == '/')
136 p++;
137 skip_spaces(&p);
138 q = buf;
139 while (!strchr(sep, *p) && *p != '\0') {
140 if ((q - buf) < buf_size - 1)
141 *q++ = *p;
142 p++;
143 }
144 if (buf_size > 0)
145 *q = '\0';
146 *pp = p;
147 }
148
149 static void get_word(char *buf, int buf_size, const char **pp)
150 {
151 const char *p;
152 char *q;
153
154 p = *pp;
155 skip_spaces(&p);
156 q = buf;
157 while (!redir_isspace(*p) && *p != '\0') {
158 if ((q - buf) < buf_size - 1)
159 *q++ = *p;
160 p++;
161 }
162 if (buf_size > 0)
163 *q = '\0';
164 *pp = p;
165 }
166
167 /* parse the rtpmap description: <codec_name>/<clock_rate>[/<other
168 params>] */
169 static int sdp_parse_rtpmap(AVCodecContext *codec, RTSPStream *rtsp_st, int payload_type, const char *p)
170 {
171 char buf[256];
172 int i;
173 AVCodec *c;
174 const char *c_name;
175
176 /* Loop into AVRtpDynamicPayloadTypes[] and AVRtpPayloadTypes[] and
177 see if we can handle this kind of payload */
178 get_word_sep(buf, sizeof(buf), "/", &p);
179 if (payload_type >= RTP_PT_PRIVATE) {
180 RTPDynamicProtocolHandler *handler= RTPFirstDynamicPayloadHandler;
181 while(handler) {
182 if (!strcmp(buf, handler->enc_name) && (codec->codec_type == handler->codec_type)) {
183 codec->codec_id = handler->codec_id;
184 rtsp_st->dynamic_handler= handler;
185 if(handler->open) {
186 rtsp_st->dynamic_protocol_context= handler->open();
187 }
188 break;
189 }
190 handler= handler->next;
191 }
192 } else {
193 /* We are in a standard case ( from http://www.iana.org/assignments/rtp-parameters) */
194 /* search into AVRtpPayloadTypes[] */
195 codec->codec_id = ff_rtp_codec_id(buf, codec->codec_type);
196 }
197
198 c = avcodec_find_decoder(codec->codec_id);
199 if (c && c->name)
200 c_name = c->name;
201 else
202 c_name = (char *)NULL;
203
204 if (c_name) {
205 get_word_sep(buf, sizeof(buf), "/", &p);
206 i = atoi(buf);
207 switch (codec->codec_type) {
208 case CODEC_TYPE_AUDIO:
209 av_log(codec, AV_LOG_DEBUG, " audio codec set to : %s\n", c_name);
210 codec->sample_rate = RTSP_DEFAULT_AUDIO_SAMPLERATE;
211 codec->channels = RTSP_DEFAULT_NB_AUDIO_CHANNELS;
212 if (i > 0) {
213 codec->sample_rate = i;
214 get_word_sep(buf, sizeof(buf), "/", &p);
215 i = atoi(buf);
216 if (i > 0)
217 codec->channels = i;
218 // TODO: there is a bug here; if it is a mono stream, and less than 22000Hz, faad upconverts to stereo and twice the
219 // frequency. No problem, but the sample rate is being set here by the sdp line. Upcoming patch forthcoming. (rdm)
220 }
221 av_log(codec, AV_LOG_DEBUG, " audio samplerate set to : %i\n", codec->sample_rate);
222 av_log(codec, AV_LOG_DEBUG, " audio channels set to : %i\n", codec->channels);
223 break;
224 case CODEC_TYPE_VIDEO:
225 av_log(codec, AV_LOG_DEBUG, " video codec set to : %s\n", c_name);
226 break;
227 default:
228 break;
229 }
230 return 0;
231 }
232
233 return -1;
234 }
235
236 /* return the length and optionnaly the data */
237 static int hex_to_data(uint8_t *data, const char *p)
238 {
239 int c, len, v;
240
241 len = 0;
242 v = 1;
243 for(;;) {
244 skip_spaces(&p);
245 if (p == '\0')
246 break;
247 c = toupper((unsigned char)*p++);
248 if (c >= '0' && c <= '9')
249 c = c - '0';
250 else if (c >= 'A' && c <= 'F')
251 c = c - 'A' + 10;
252 else
253 break;
254 v = (v << 4) | c;
255 if (v & 0x100) {
256 if (data)
257 data[len] = v;
258 len++;
259 v = 1;
260 }
261 }
262 return len;
263 }
264
265 static void sdp_parse_fmtp_config(AVCodecContext *codec, char *attr, char *value)
266 {
267 switch (codec->codec_id) {
268 case CODEC_ID_MPEG4:
269 case CODEC_ID_AAC:
270 if (!strcmp(attr, "config")) {
271 /* decode the hexa encoded parameter */
272 int len = hex_to_data(NULL, value);
273 codec->extradata = av_mallocz(len + FF_INPUT_BUFFER_PADDING_SIZE);
274 if (!codec->extradata)
275 return;
276 codec->extradata_size = len;
277 hex_to_data(codec->extradata, value);
278 }
279 break;
280 default:
281 break;
282 }
283 return;
284 }
285
286 typedef struct attrname_map
287 {
288 const char *str;
289 uint16_t type;
290 uint32_t offset;
291 } attrname_map_t;
292
293 /* All known fmtp parmeters and the corresping RTPAttrTypeEnum */
294 #define ATTR_NAME_TYPE_INT 0
295 #define ATTR_NAME_TYPE_STR 1
296 static const attrname_map_t attr_names[]=
297 {
298 {"SizeLength", ATTR_NAME_TYPE_INT, offsetof(rtp_payload_data_t, sizelength)},
299 {"IndexLength", ATTR_NAME_TYPE_INT, offsetof(rtp_payload_data_t, indexlength)},
300 {"IndexDeltaLength", ATTR_NAME_TYPE_INT, offsetof(rtp_payload_data_t, indexdeltalength)},
301 {"profile-level-id", ATTR_NAME_TYPE_INT, offsetof(rtp_payload_data_t, profile_level_id)},
302 {"StreamType", ATTR_NAME_TYPE_INT, offsetof(rtp_payload_data_t, streamtype)},
303 {"mode", ATTR_NAME_TYPE_STR, offsetof(rtp_payload_data_t, mode)},
304 {NULL, -1, -1},
305 };
306
307 /** parse the attribute line from the fmtp a line of an sdp resonse. This is broken out as a function
308 * because it is used in rtp_h264.c, which is forthcoming.
309 */
310 int rtsp_next_attr_and_value(const char **p, char *attr, int attr_size, char *value, int value_size)
311 {
312 skip_spaces(p);
313 if(**p)
314 {
315 get_word_sep(attr, attr_size, "=", p);
316 if (**p == '=')
317 (*p)++;
318 get_word_sep(value, value_size, ";", p);
319 if (**p == ';')
320 (*p)++;
321 return 1;
322 }
323 return 0;
324 }
325
326 /* parse a SDP line and save stream attributes */
327 static void sdp_parse_fmtp(AVStream *st, const char *p)
328 {
329 char attr[256];
330 char value[4096];
331 int i;
332
333 RTSPStream *rtsp_st = st->priv_data;
334 AVCodecContext *codec = st->codec;
335 rtp_payload_data_t *rtp_payload_data = &rtsp_st->rtp_payload_data;
336
337 /* loop on each attribute */
338 while(rtsp_next_attr_and_value(&p, attr, sizeof(attr), value, sizeof(value)))
339 {
340 /* grab the codec extra_data from the config parameter of the fmtp line */
341 sdp_parse_fmtp_config(codec, attr, value);
342 /* Looking for a known attribute */
343 for (i = 0; attr_names[i].str; ++i) {
344 if (!strcasecmp(attr, attr_names[i].str)) {
345 if (attr_names[i].type == ATTR_NAME_TYPE_INT)
346 *(int *)((char *)rtp_payload_data + attr_names[i].offset) = atoi(value);
347 else if (attr_names[i].type == ATTR_NAME_TYPE_STR)
348 *(char **)((char *)rtp_payload_data + attr_names[i].offset) = av_strdup(value);
349 }
350 }
351 }
352 }
353
354 /** Parse a string \p in the form of Range:npt=xx-xx, and determine the start
355 * and end time.
356 * Used for seeking in the rtp stream.
357 */
358 static void rtsp_parse_range_npt(const char *p, int64_t *start, int64_t *end)
359 {
360 char buf[256];
361
362 skip_spaces(&p);
363 if (!av_stristart(p, "npt=", &p))
364 return;
365
366 *start = AV_NOPTS_VALUE;
367 *end = AV_NOPTS_VALUE;
368
369 get_word_sep(buf, sizeof(buf), "-", &p);
370 *start = parse_date(buf, 1);
371 if (*p == '-') {
372 p++;
373 get_word_sep(buf, sizeof(buf), "-", &p);
374 *end = parse_date(buf, 1);
375 }
376 // av_log(NULL, AV_LOG_DEBUG, "Range Start: %lld\n", *start);
377 // av_log(NULL, AV_LOG_DEBUG, "Range End: %lld\n", *end);
378 }
379
380 typedef struct SDPParseState {
381 /* SDP only */
382 struct in_addr default_ip;
383 int default_ttl;
384 } SDPParseState;
385
386 static void sdp_parse_line(AVFormatContext *s, SDPParseState *s1,
387 int letter, const char *buf)
388 {
389 RTSPState *rt = s->priv_data;
390 char buf1[64], st_type[64];
391 const char *p;
392 enum CodecType codec_type;
393 int payload_type, i;
394 AVStream *st;
395 RTSPStream *rtsp_st;
396 struct in_addr sdp_ip;
397 int ttl;
398
399 #ifdef DEBUG
400 printf("sdp: %c='%s'\n", letter, buf);
401 #endif
402
403 p = buf;
404 switch(letter) {
405 case 'c':
406 get_word(buf1, sizeof(buf1), &p);
407 if (strcmp(buf1, "IN") != 0)
408 return;
409 get_word(buf1, sizeof(buf1), &p);
410 if (strcmp(buf1, "IP4") != 0)
411 return;
412 get_word_sep(buf1, sizeof(buf1), "/", &p);
413 if (inet_aton(buf1, &sdp_ip) == 0)
414 return;
415 ttl = 16;
416 if (*p == '/') {
417 p++;
418 get_word_sep(buf1, sizeof(buf1), "/", &p);
419 ttl = atoi(buf1);
420 }
421 if (s->nb_streams == 0) {
422 s1->default_ip = sdp_ip;
423 s1->default_ttl = ttl;
424 } else {
425 st = s->streams[s->nb_streams - 1];
426 rtsp_st = st->priv_data;
427 rtsp_st->sdp_ip = sdp_ip;
428 rtsp_st->sdp_ttl = ttl;
429 }
430 break;
431 case 's':
432 av_strlcpy(s->title, p, sizeof(s->title));
433 break;
434 case 'i':
435 if (s->nb_streams == 0) {
436 av_strlcpy(s->comment, p, sizeof(s->comment));
437 break;
438 }
439 break;
440 case 'm':
441 /* new stream */
442 get_word(st_type, sizeof(st_type), &p);
443 if (!strcmp(st_type, "audio")) {
444 codec_type = CODEC_TYPE_AUDIO;
445 } else if (!strcmp(st_type, "video")) {
446 codec_type = CODEC_TYPE_VIDEO;
447 } else {
448 return;
449 }
450 rtsp_st = av_mallocz(sizeof(RTSPStream));
451 if (!rtsp_st)
452 return;
453 rtsp_st->stream_index = -1;
454 dynarray_add(&rt->rtsp_streams, &rt->nb_rtsp_streams, rtsp_st);
455
456 rtsp_st->sdp_ip = s1->default_ip;
457 rtsp_st->sdp_ttl = s1->default_ttl;
458
459 get_word(buf1, sizeof(buf1), &p); /* port */
460 rtsp_st->sdp_port = atoi(buf1);
461
462 get_word(buf1, sizeof(buf1), &p); /* protocol (ignored) */
463
464 /* XXX: handle list of formats */
465 get_word(buf1, sizeof(buf1), &p); /* format list */
466 rtsp_st->sdp_payload_type = atoi(buf1);
467
468 if (!strcmp(ff_rtp_enc_name(rtsp_st->sdp_payload_type), "MP2T")) {
469 /* no corresponding stream */
470 } else {
471 st = av_new_stream(s, 0);
472 if (!st)
473 return;
474 st->priv_data = rtsp_st;
475 rtsp_st->stream_index = st->index;
476 st->codec->codec_type = codec_type;
477 if (rtsp_st->sdp_payload_type < RTP_PT_PRIVATE) {
478 /* if standard payload type, we can find the codec right now */
479 rtp_get_codec_info(st->codec, rtsp_st->sdp_payload_type);
480 }
481 }
482 /* put a default control url */
483 av_strlcpy(rtsp_st->control_url, s->filename, sizeof(rtsp_st->control_url));
484 break;
485 case 'a':
486 if (av_strstart(p, "control:", &p) && s->nb_streams > 0) {
487 char proto[32];
488 /* get the control url */
489 st = s->streams[s->nb_streams - 1];
490 rtsp_st = st->priv_data;
491
492 /* XXX: may need to add full url resolution */
493 url_split(proto, sizeof(proto), NULL, 0, NULL, 0, NULL, NULL, 0, p);
494 if (proto[0] == '\0') {
495 /* relative control URL */
496 av_strlcat(rtsp_st->control_url, "/", sizeof(rtsp_st->control_url));
497 av_strlcat(rtsp_st->control_url, p, sizeof(rtsp_st->control_url));
498 } else {
499 av_strlcpy(rtsp_st->control_url, p, sizeof(rtsp_st->control_url));
500 }
501 } else if (av_strstart(p, "rtpmap:", &p)) {
502 /* NOTE: rtpmap is only supported AFTER the 'm=' tag */
503 get_word(buf1, sizeof(buf1), &p);
504 payload_type = atoi(buf1);
505 for(i = 0; i < s->nb_streams;i++) {
506 st = s->streams[i];
507 rtsp_st = st->priv_data;
508 if (rtsp_st->sdp_payload_type == payload_type) {
509 sdp_parse_rtpmap(st->codec, rtsp_st, payload_type, p);
510 }
511 }
512 } else if (av_strstart(p, "fmtp:", &p)) {
513 /* NOTE: fmtp is only supported AFTER the 'a=rtpmap:xxx' tag */
514 get_word(buf1, sizeof(buf1), &p);
515 payload_type = atoi(buf1);
516 for(i = 0; i < s->nb_streams;i++) {
517 st = s->streams[i];
518 rtsp_st = st->priv_data;
519 if (rtsp_st->sdp_payload_type == payload_type) {
520 if(rtsp_st->dynamic_handler && rtsp_st->dynamic_handler->parse_sdp_a_line) {
521 if(!rtsp_st->dynamic_handler->parse_sdp_a_line(st, rtsp_st->dynamic_protocol_context, buf)) {
522 sdp_parse_fmtp(st, p);
523 }
524 } else {
525 sdp_parse_fmtp(st, p);
526 }
527 }
528 }
529 } else if(av_strstart(p, "framesize:", &p)) {
530 // let dynamic protocol handlers have a stab at the line.
531 get_word(buf1, sizeof(buf1), &p);
532 payload_type = atoi(buf1);
533 for(i = 0; i < s->nb_streams;i++) {
534 st = s->streams[i];
535 rtsp_st = st->priv_data;
536 if (rtsp_st->sdp_payload_type == payload_type) {
537 if(rtsp_st->dynamic_handler && rtsp_st->dynamic_handler->parse_sdp_a_line) {
538 rtsp_st->dynamic_handler->parse_sdp_a_line(st, rtsp_st->dynamic_protocol_context, buf);
539 }
540 }
541 }
542 } else if(av_strstart(p, "range:", &p)) {
543 int64_t start, end;
544
545 // this is so that seeking on a streamed file can work.
546 rtsp_parse_range_npt(p, &start, &end);
547 s->start_time= start;
548 s->duration= (end==AV_NOPTS_VALUE)?AV_NOPTS_VALUE:end-start; // AV_NOPTS_VALUE means live broadcast (and can't seek)
549 } else if (av_strstart(p, "IsRealDataType:integer;",&p)) {
550 if (atoi(p) == 1)
551 rt->transport = RTSP_TRANSPORT_RDT;
552 } else if (s->nb_streams > 0) {
553 rtsp_st = s->streams[s->nb_streams - 1]->priv_data;
554 if (rtsp_st->dynamic_handler &&
555 rtsp_st->dynamic_handler->parse_sdp_a_line)
556 rtsp_st->dynamic_handler->parse_sdp_a_line(s->streams[s->nb_streams - 1],
557 rtsp_st->dynamic_protocol_context, buf);
558 }
559 break;
560 }
561 }
562
563 static int sdp_parse(AVFormatContext *s, const char *content)
564 {
565 const char *p;
566 int letter;
567 char buf[2048], *q;
568 SDPParseState sdp_parse_state, *s1 = &sdp_parse_state;
569
570 memset(s1, 0, sizeof(SDPParseState));
571 p = content;
572 for(;;) {
573 skip_spaces(&p);
574 letter = *p;
575 if (letter == '\0')
576 break;
577 p++;
578 if (*p != '=')
579 goto next_line;
580 p++;
581 /* get the content */
582 q = buf;
583 while (*p != '\n' && *p != '\r' && *p != '\0') {
584 if ((q - buf) < sizeof(buf) - 1)
585 *q++ = *p;
586 p++;
587 }
588 *q = '\0';
589 sdp_parse_line(s, s1, letter, buf);
590 next_line:
591 while (*p != '\n' && *p != '\0')
592 p++;
593 if (*p == '\n')
594 p++;
595 }
596 return 0;
597 }
598
599 static void rtsp_parse_range(int *min_ptr, int *max_ptr, const char **pp)
600 {
601 const char *p;
602 int v;
603
604 p = *pp;
605 skip_spaces(&p);
606 v = strtol(p, (char **)&p, 10);
607 if (*p == '-') {
608 p++;
609 *min_ptr = v;
610 v = strtol(p, (char **)&p, 10);
611 *max_ptr = v;
612 } else {
613 *min_ptr = v;
614 *max_ptr = v;
615 }
616 *pp = p;
617 }
618
619 /* XXX: only one transport specification is parsed */
620 static void rtsp_parse_transport(RTSPHeader *reply, const char *p)
621 {
622 char transport_protocol[16];
623 char profile[16];
624 char lower_transport[16];
625 char parameter[16];
626 RTSPTransportField *th;
627 char buf[256];
628
629 reply->nb_transports = 0;
630
631 for(;;) {
632 skip_spaces(&p);
633 if (*p == '\0')
634 break;
635
636 th = &reply->transports[reply->nb_transports];
637
638 get_word_sep(transport_protocol, sizeof(transport_protocol),
639 "/", &p);
640 if (*p == '/')
641 p++;
642 if (!strcasecmp (transport_protocol, "rtp")) {
643 get_word_sep(profile, sizeof(profile), "/;,", &p);
644 lower_transport[0] = '\0';
645 /* rtp/avp/<protocol> */
646 if (*p == '/') {
647 p++;
648 get_word_sep(lower_transport, sizeof(lower_transport),
649 ";,", &p);
650 }
651 th->transport = RTSP_TRANSPORT_RTP;
652 } else if (!strcasecmp (transport_protocol, "x-pn-tng") ||
653 !strcasecmp (transport_protocol, "x-real-rdt")) {
654 /* x-pn-tng/<protocol> */
655 get_word_sep(lower_transport, sizeof(lower_transport), "/;,", &p);
656 profile[0] = '\0';
657 th->transport = RTSP_TRANSPORT_RDT;
658 }
659 if (!strcasecmp(lower_transport, "TCP"))
660 th->lower_transport = RTSP_LOWER_TRANSPORT_TCP;
661 else
662 th->lower_transport = RTSP_LOWER_TRANSPORT_UDP;
663
664 if (*p == ';')
665 p++;
666 /* get each parameter */
667 while (*p != '\0' && *p != ',') {
668 get_word_sep(parameter, sizeof(parameter), "=;,", &p);
669 if (!strcmp(parameter, "port")) {
670 if (*p == '=') {
671 p++;
672 rtsp_parse_range(&th->port_min, &th->port_max, &p);
673 }
674 } else if (!strcmp(parameter, "client_port")) {
675 if (*p == '=') {
676 p++;
677 rtsp_parse_range(&th->client_port_min,
678 &th->client_port_max, &p);
679 }
680 } else if (!strcmp(parameter, "server_port")) {
681 if (*p == '=') {
682 p++;
683 rtsp_parse_range(&th->server_port_min,
684 &th->server_port_max, &p);
685 }
686 } else if (!strcmp(parameter, "interleaved")) {
687 if (*p == '=') {
688 p++;
689 rtsp_parse_range(&th->interleaved_min,
690 &th->interleaved_max, &p);
691 }
692 } else if (!strcmp(parameter, "multicast")) {
693 if (th->lower_transport == RTSP_LOWER_TRANSPORT_UDP)
694 th->lower_transport = RTSP_LOWER_TRANSPORT_UDP_MULTICAST;
695 } else if (!strcmp(parameter, "ttl")) {
696 if (*p == '=') {
697 p++;
698 th->ttl = strtol(p, (char **)&p, 10);
699 }
700 } else if (!strcmp(parameter, "destination")) {
701 struct in_addr ipaddr;
702
703 if (*p == '=') {
704 p++;
705 get_word_sep(buf, sizeof(buf), ";,", &p);
706 if (inet_aton(buf, &ipaddr))
707 th->destination = ntohl(ipaddr.s_addr);
708 }
709 }
710 while (*p != ';' && *p != '\0' && *p != ',')
711 p++;
712 if (*p == ';')
713 p++;
714 }
715 if (*p == ',')
716 p++;
717
718 reply->nb_transports++;
719 }
720 }
721
722 void rtsp_parse_line(RTSPHeader *reply, const char *buf)
723 {
724 const char *p;
725
726 /* NOTE: we do case independent match for broken servers */
727 p = buf;
728 if (av_stristart(p, "Session:", &p)) {
729 get_word_sep(reply->session_id, sizeof(reply->session_id), ";", &p);
730 } else if (av_stristart(p, "Content-Length:", &p)) {
731 reply->content_length = strtol(p, NULL, 10);
732 } else if (av_stristart(p, "Transport:", &p)) {
733 rtsp_parse_transport(reply, p);
734 } else if (av_stristart(p, "CSeq:", &p)) {
735 reply->seq = strtol(p, NULL, 10);
736 } else if (av_stristart(p, "Range:", &p)) {
737 rtsp_parse_range_npt(p, &reply->range_start, &reply->range_end);
738 } else if (av_stristart(p, "RealChallenge1:", &p)) {
739 skip_spaces(&p);
740 av_strlcpy(reply->real_challenge, p, sizeof(reply->real_challenge));
741 }
742 }
743
744 static int url_readbuf(URLContext *h, unsigned char *buf, int size)
745 {
746 int ret, len;
747
748 len = 0;
749 while (len < size) {
750 ret = url_read(h, buf+len, size-len);
751 if (ret < 1)
752 return ret;
753 len += ret;
754 }
755 return len;
756 }
757
758 /* skip a RTP/TCP interleaved packet */
759 static void rtsp_skip_packet(AVFormatContext *s)
760 {
761 RTSPState *rt = s->priv_data;
762 int ret, len, len1;
763 uint8_t buf[1024];
764
765 ret = url_readbuf(rt->rtsp_hd, buf, 3);
766 if (ret != 3)
767 return;
768 len = AV_RB16(buf + 1);
769 #ifdef DEBUG
770 printf("skipping RTP packet len=%d\n", len);
771 #endif
772 /* skip payload */
773 while (len > 0) {
774 len1 = len;
775 if (len1 > sizeof(buf))
776 len1 = sizeof(buf);
777 ret = url_readbuf(rt->rtsp_hd, buf, len1);
778 if (ret != len1)
779 return;
780 len -= len1;
781 }
782 }
783
784 static void rtsp_send_cmd(AVFormatContext *s,
785 const char *cmd, RTSPHeader *reply,
786 unsigned char **content_ptr)
787 {
788 RTSPState *rt = s->priv_data;
789 char buf[4096], buf1[1024], *q;
790 unsigned char ch;
791 const char *p;
792 int content_length, line_count;
793 unsigned char *content = NULL;
794
795 memset(reply, 0, sizeof(RTSPHeader));
796
797 rt->seq++;
798 av_strlcpy(buf, cmd, sizeof(buf));
799 snprintf(buf1, sizeof(buf1), "CSeq: %d\r\n", rt->seq);
800 av_strlcat(buf, buf1, sizeof(buf));
801 if (rt->session_id[0] != '\0' && !strstr(cmd, "\nIf-Match:")) {
802 snprintf(buf1, sizeof(buf1), "Session: %s\r\n", rt->session_id);
803 av_strlcat(buf, buf1, sizeof(buf));
804 }
805 av_strlcat(buf, "\r\n", sizeof(buf));
806 #ifdef DEBUG
807 printf("Sending:\n%s--\n", buf);
808 #endif
809 url_write(rt->rtsp_hd, buf, strlen(buf));
810
811 /* parse reply (XXX: use buffers) */
812 line_count = 0;
813 rt->last_reply[0] = '\0';
814 for(;;) {
815 q = buf;
816 for(;;) {
817 if (url_readbuf(rt->rtsp_hd, &ch, 1) != 1)
818 break;
819 if (ch == '\n')
820 break;
821 if (ch == '$') {
822 /* XXX: only parse it if first char on line ? */
823 rtsp_skip_packet(s);
824 } else if (ch != '\r') {
825 if ((q - buf) < sizeof(buf) - 1)
826 *q++ = ch;
827 }
828 }
829 *q = '\0';
830 #ifdef DEBUG
831 printf("line='%s'\n", buf);
832 #endif
833 /* test if last line */
834 if (buf[0] == '\0')
835 break;
836 p = buf;
837 if (line_count == 0) {
838 /* get reply code */
839 get_word(buf1, sizeof(buf1), &p);
840 get_word(buf1, sizeof(buf1), &p);
841 reply->status_code = atoi(buf1);
842 } else {
843 rtsp_parse_line(reply, p);
844 av_strlcat(rt->last_reply, p, sizeof(rt->last_reply));
845 av_strlcat(rt->last_reply, "\n", sizeof(rt->last_reply));
846 }
847 line_count++;
848 }
849
850 if (rt->session_id[0] == '\0' && reply->session_id[0] != '\0')
851 av_strlcpy(rt->session_id, reply->session_id, sizeof(rt->session_id));
852
853 content_length = reply->content_length;
854 if (content_length > 0) {
855 /* leave some room for a trailing '\0' (useful for simple parsing) */
856 content = av_malloc(content_length + 1);
857 (void)url_readbuf(rt->rtsp_hd, content, content_length);
858 content[content_length] = '\0';
859 }
860 if (content_ptr)
861 *content_ptr = content;
862 else
863 av_free(content);
864 }
865
866
867 /* close and free RTSP streams */
868 static void rtsp_close_streams(RTSPState *rt)
869 {
870 int i;
871 RTSPStream *rtsp_st;
872
873 for(i=0;i<rt->nb_rtsp_streams;i++) {
874 rtsp_st = rt->rtsp_streams[i];
875 if (rtsp_st) {
876 if (rtsp_st->tx_ctx) {
877 if (rt->transport == RTSP_TRANSPORT_RDT)
878 ff_rdt_parse_close(rtsp_st->tx_ctx);
879 else
880 rtp_parse_close(rtsp_st->tx_ctx);
881 }
882 if (rtsp_st->rtp_handle)
883 url_close(rtsp_st->rtp_handle);
884 if (rtsp_st->dynamic_handler && rtsp_st->dynamic_protocol_context)
885 rtsp_st->dynamic_handler->close(rtsp_st->dynamic_protocol_context);
886 }
887 }
888 av_free(rt->rtsp_streams);
889 }
890
891 static int
892 rtsp_open_transport_ctx(AVFormatContext *s, RTSPStream *rtsp_st)
893 {
894 RTSPState *rt = s->priv_data;
895 AVStream *st = NULL;
896
897 /* open the RTP context */
898 if (rtsp_st->stream_index >= 0)
899 st = s->streams[rtsp_st->stream_index];
900 if (!st)
901 s->ctx_flags |= AVFMTCTX_NOHEADER;
902
903 if (rt->transport == RTSP_TRANSPORT_RDT)
904 rtsp_st->tx_ctx = ff_rdt_parse_open(s, st,
905 rtsp_st->dynamic_protocol_context,
906 rtsp_st->dynamic_handler);
907 else
908 rtsp_st->tx_ctx = rtp_parse_open(s, st, rtsp_st->rtp_handle, rtsp_st->sdp_payload_type, &rtsp_st->rtp_payload_data);
909
910 if (!rtsp_st->tx_ctx) {
911 return AVERROR(ENOMEM);
912 } else if (rt->transport != RTSP_TRANSPORT_RDT) {
913 if(rtsp_st->dynamic_handler) {
914 rtp_parse_set_dynamic_protocol(rtsp_st->tx_ctx,
915 rtsp_st->dynamic_protocol_context,
916 rtsp_st->dynamic_handler);
917 }
918 }
919
920 return 0;
921 }
922
923 /**
924 * @returns 0 on success, <0 on error, 1 if protocol is unavailable.
925 */
926 static int
927 make_setup_request (AVFormatContext *s, const char *host, int port,
928 int lower_transport, const char *real_challenge)
929 {
930 RTSPState *rt = s->priv_data;
931 int j, i, err;
932 RTSPStream *rtsp_st;
933 RTSPHeader reply1, *reply = &reply1;
934 char cmd[2048];
935 const char *trans_pref;
936
937 if (rt->transport == RTSP_TRANSPORT_RDT)
938 trans_pref = "x-pn-tng";
939 else
940 trans_pref = "RTP/AVP";
941
942 /* for each stream, make the setup request */
943 /* XXX: we assume the same server is used for the control of each
944 RTSP stream */
945
946 for(j = RTSP_RTP_PORT_MIN, i = 0; i < rt->nb_rtsp_streams; ++i) {
947 char transport[2048];
948
949 rtsp_st = rt->rtsp_streams[i];
950
951 /* RTP/UDP */
952 if (lower_transport == RTSP_LOWER_TRANSPORT_UDP) {
953 char buf[256];
954
955 /* first try in specified port range */
956 if (RTSP_RTP_PORT_MIN != 0) {
957 while(j <= RTSP_RTP_PORT_MAX) {
958 snprintf(buf, sizeof(buf), "rtp://%s?localport=%d", host, j);
959 j += 2; /* we will use two port by rtp stream (rtp and rtcp) */
960 if (url_open(&rtsp_st->rtp_handle, buf, URL_RDWR) == 0) {
961 goto rtp_opened;
962 }
963 }
964 }
965
966 /* then try on any port
967 ** if (url_open(&rtsp_st->rtp_handle, "rtp://", URL_RDONLY) < 0) {
968 ** err = AVERROR_INVALIDDATA;
969 ** goto fail;
970 ** }
971 */
972
973 rtp_opened:
974 port = rtp_get_local_port(rtsp_st->rtp_handle);
975 snprintf(transport, sizeof(transport) - 1,
976 "%s/UDP;", trans_pref);
977 if (rt->server_type != RTSP_SERVER_REAL)
978 av_strlcat(transport, "unicast;", sizeof(transport));
979 av_strlcatf(transport, sizeof(transport),
980 "client_port=%d", port);
981 if (rt->transport == RTSP_TRANSPORT_RTP)
982 av_strlcatf(transport, sizeof(transport), "-%d", port + 1);
983 }
984
985 /* RTP/TCP */
986 else if (lower_transport == RTSP_LOWER_TRANSPORT_TCP) {
987 snprintf(transport, sizeof(transport) - 1,
988 "%s/TCP", trans_pref);
989 }
990
991 else if (lower_transport == RTSP_LOWER_TRANSPORT_UDP_MULTICAST) {
992 snprintf(transport, sizeof(transport) - 1,
993 "%s/UDP;multicast", trans_pref);
994 }
995 if (rt->server_type == RTSP_SERVER_REAL)
996 av_strlcat(transport, ";mode=play", sizeof(transport));
997 snprintf(cmd, sizeof(cmd),
998 "SETUP %s RTSP/1.0\r\n"
999 "Transport: %s\r\n",
1000 rtsp_st->control_url, transport);
1001 if (i == 0 && rt->server_type == RTSP_SERVER_REAL) {
1002 char real_res[41], real_csum[9];
1003 ff_rdt_calc_response_and_checksum(real_res, real_csum,
1004 real_challenge);
1005 av_strlcatf(cmd, sizeof(cmd),
1006 "If-Match: %s\r\n"
1007 "RealChallenge2: %s, sd=%s\r\n",
1008 rt->session_id, real_res, real_csum);
1009 }
1010 rtsp_send_cmd(s, cmd, reply, NULL);
1011 if (reply->status_code == 461 /* Unsupported protocol */ && i == 0) {
1012 err = 1;
1013 goto fail;
1014 } else if (reply->status_code != RTSP_STATUS_OK ||
1015 reply->nb_transports != 1) {
1016 err = AVERROR_INVALIDDATA;
1017 goto fail;
1018 }
1019
1020 /* XXX: same protocol for all streams is required */
1021 if (i > 0) {
1022 if (reply->transports[0].lower_transport != rt->lower_transport ||
1023 reply->transports[0].transport != rt->transport) {
1024 err = AVERROR_INVALIDDATA;
1025 goto fail;
1026 }
1027 } else {
1028 rt->lower_transport = reply->transports[0].lower_transport;
1029 rt->transport = reply->transports[0].transport;
1030 }
1031
1032 /* close RTP connection if not choosen */
1033 if (reply->transports[0].lower_transport != RTSP_LOWER_TRANSPORT_UDP &&
1034 (lower_transport == RTSP_LOWER_TRANSPORT_UDP)) {
1035 url_close(rtsp_st->rtp_handle);
1036 rtsp_st->rtp_handle = NULL;
1037 }
1038
1039 switch(reply->transports[0].lower_transport) {
1040 case RTSP_LOWER_TRANSPORT_TCP:
1041 rtsp_st->interleaved_min = reply->transports[0].interleaved_min;
1042 rtsp_st->interleaved_max = reply->transports[0].interleaved_max;
1043 break;
1044
1045 case RTSP_LOWER_TRANSPORT_UDP:
1046 {
1047 char url[1024];
1048
1049 /* XXX: also use address if specified */
1050 snprintf(url, sizeof(url), "rtp://%s:%d",
1051 host, reply->transports[0].server_port_min);
1052 if (rtp_set_remote_url(rtsp_st->rtp_handle, url) < 0) {
1053 err = AVERROR_INVALIDDATA;
1054 goto fail;
1055 }
1056 }
1057 break;
1058 case RTSP_LOWER_TRANSPORT_UDP_MULTICAST:
1059 {
1060 char url[1024];
1061 struct in_addr in;
1062
1063 in.s_addr = htonl(reply->transports[0].destination);
1064 snprintf(url, sizeof(url), "rtp://%s:%d?ttl=%d",
1065 inet_ntoa(in),
1066 reply->transports[0].port_min,
1067 reply->transports[0].ttl);
1068 if (url_open(&rtsp_st->rtp_handle, url, URL_RDWR) < 0) {
1069 err = AVERROR_INVALIDDATA;
1070 goto fail;
1071 }
1072 }
1073 break;
1074 }
1075
1076 if ((err = rtsp_open_transport_ctx(s, rtsp_st)))
1077 goto fail;
1078 }
1079
1080 if (rt->server_type == RTSP_SERVER_REAL)
1081 rt->need_subscription = 1;
1082
1083 return 0;
1084
1085 fail:
1086 for (i=0; i<rt->nb_rtsp_streams; i++) {
1087 if (rt->rtsp_streams[i]->rtp_handle) {
1088 url_close(rt->rtsp_streams[i]->rtp_handle);
1089 rt->rtsp_streams[i]->rtp_handle = NULL;
1090 }
1091 }
1092 return err;
1093 }
1094
1095 static int rtsp_read_header(AVFormatContext *s,
1096 AVFormatParameters *ap)
1097 {
1098 RTSPState *rt = s->priv_data;
1099 char host[1024], path[1024], tcpname[1024], cmd[2048], *option_list, *option;
1100 URLContext *rtsp_hd;
1101 int port, ret, err;
1102 RTSPHeader reply1, *reply = &reply1;
1103 unsigned char *content = NULL;
1104 int lower_transport_mask = 0;
1105 char real_challenge[64];
1106
1107 /* extract hostname and port */
1108 url_split(NULL, 0, NULL, 0,
1109 host, sizeof(host), &port, path, sizeof(path), s->filename);
1110 if (port < 0)
1111 port = RTSP_DEFAULT_PORT;
1112
1113 /* search for options */
1114 option_list = strchr(path, '?');
1115 if (option_list) {
1116 /* remove the options from the path */
1117 *option_list++ = 0;
1118 while(option_list) {
1119 /* move the option pointer */
1120 option = option_list;
1121 option_list = strchr(option_list, '&');
1122 if (option_list)
1123 *(option_list++) = 0;
1124 /* handle the options */
1125 if (strcmp(option, "udp") == 0)
1126 lower_transport_mask = (1<< RTSP_LOWER_TRANSPORT_UDP);
1127 else if (strcmp(option, "multicast") == 0)
1128 lower_transport_mask = (1<< RTSP_LOWER_TRANSPORT_UDP_MULTICAST);
1129 else if (strcmp(option, "tcp") == 0)
1130 lower_transport_mask = (1<< RTSP_LOWER_TRANSPORT_TCP);
1131 }
1132 }
1133
1134 if (!lower_transport_mask)
1135 lower_transport_mask = (1 << RTSP_LOWER_TRANSPORT_LAST) - 1;
1136
1137 /* open the tcp connexion */
1138 snprintf(tcpname, sizeof(tcpname), "tcp://%s:%d", host, port);
1139 if (url_open(&rtsp_hd, tcpname, URL_RDWR) < 0)
1140 return AVERROR(EIO);
1141 rt->rtsp_hd = rtsp_hd;
1142 rt->seq = 0;
1143
1144 /* request options supported by the server; this also detects server type */
1145 for (rt->server_type = RTSP_SERVER_RTP;;) {
1146 snprintf(cmd, sizeof(cmd),
1147 "OPTIONS %s RTSP/1.0\r\n", s->filename);
1148 if (rt->server_type == RTSP_SERVER_REAL)
1149 av_strlcat(cmd,
1150 /**
1151 * The following entries are required for proper
1152 * streaming from a Realmedia server. They are
1153 * interdependent in some way although we currently
1154 * don't quite understand how. Values were copied
1155 * from mplayer SVN r23589.
1156 * @param CompanyID is a 16-byte ID in base64
1157 * @param ClientChallenge is a 16-byte ID in hex
1158 */
1159 "ClientChallenge: 9e26d33f2984236010ef6253fb1887f7\r\n"
1160 "PlayerStarttime: [28/03/2003:22:50:23 00:00]\r\n"
1161 "CompanyID: KnKV4M4I/B2FjJ1TToLycw==\r\n"
1162 "GUID: 00000000-0000-0000-0000-000000000000\r\n",
1163 sizeof(cmd));
1164 rtsp_send_cmd(s, cmd, reply, NULL);
1165 if (reply->status_code != RTSP_STATUS_OK) {
1166 err = AVERROR_INVALIDDATA;
1167 goto fail;
1168 }
1169
1170 /* detect server type if not standard-compliant RTP */
1171 if (rt->server_type != RTSP_SERVER_REAL && reply->real_challenge[0]) {
1172 rt->server_type = RTSP_SERVER_REAL;
1173 continue;
1174 } else if (rt->server_type == RTSP_SERVER_REAL) {
1175 strcpy(real_challenge, reply->real_challenge);
1176 }
1177 break;
1178 }
1179
1180 /* describe the stream */
1181 snprintf(cmd, sizeof(cmd),
1182 "DESCRIBE %s RTSP/1.0\r\n"
1183 "Accept: application/sdp\r\n",
1184 s->filename);
1185 if (rt->server_type == RTSP_SERVER_REAL) {
1186 /**
1187 * The Require: attribute is needed for proper streaming from
1188 * Realmedia servers.
1189 */
1190 av_strlcat(cmd,
1191 "Require: com.real.retain-entity-for-setup\r\n",
1192 sizeof(cmd));
1193 }
1194 rtsp_send_cmd(s, cmd, reply, &content);
1195 if (!content) {
1196 err = AVERROR_INVALIDDATA;
1197 goto fail;
1198 }
1199 if (reply->status_code != RTSP_STATUS_OK) {
1200 err = AVERROR_INVALIDDATA;
1201 goto fail;
1202 }
1203
1204 /* now we got the SDP description, we parse it */
1205 ret = sdp_parse(s, (const char *)content);
1206 av_freep(&content);
1207 if (ret < 0) {
1208 err = AVERROR_INVALIDDATA;
1209 goto fail;
1210 }
1211
1212 do {
1213 int lower_transport = ff_log2_tab[lower_transport_mask & ~(lower_transport_mask - 1)];
1214
1215 err = make_setup_request(s, host, port, lower_transport,
1216 rt->server_type == RTSP_SERVER_REAL ?
1217 real_challenge : NULL);
1218 if (err < 0)
1219 goto fail;
1220 lower_transport_mask &= ~(1 << lower_transport);
1221 if (lower_transport_mask == 0 && err == 1) {
1222 err = AVERROR(FF_NETERROR(EPROTONOSUPPORT));
1223 goto fail;
1224 }
1225 } while (err);
1226
1227 rt->state = RTSP_STATE_IDLE;
1228 rt->seek_timestamp = 0; /* default is to start stream at position
1229 zero */
1230 if (ap->initial_pause) {
1231 /* do not start immediately */
1232 } else {
1233 if (rtsp_read_play(s) < 0) {
1234 err = AVERROR_INVALIDDATA;
1235 goto fail;
1236 }
1237 }
1238 return 0;
1239 fail:
1240 rtsp_close_streams(rt);
1241 av_freep(&content);
1242 url_close(rt->rtsp_hd);
1243 return err;
1244 }
1245
1246 static int tcp_read_packet(AVFormatContext *s, RTSPStream **prtsp_st,
1247 uint8_t *buf, int buf_size)
1248 {
1249 RTSPState *rt = s->priv_data;
1250 int id, len, i, ret;
1251 RTSPStream *rtsp_st;
1252
1253 #ifdef DEBUG_RTP_TCP
1254 printf("tcp_read_packet:\n");
1255 #endif
1256 redo:
1257 for(;;) {
1258 ret = url_readbuf(rt->rtsp_hd, buf, 1);
1259 #ifdef DEBUG_RTP_TCP
1260 printf("ret=%d c=%02x [%c]\n", ret, buf[0], buf[0]);
1261 #endif
1262 if (ret != 1)
1263 return -1;
1264 if (buf[0] == '$')
1265 break;
1266 }
1267 ret = url_readbuf(rt->rtsp_hd, buf, 3);
1268 if (ret != 3)
1269 return -1;
1270 id = buf[0];
1271 len = AV_RB16(buf + 1);
1272 #ifdef DEBUG_RTP_TCP
1273 printf("id=%d len=%d\n", id, len);
1274 #endif
1275 if (len > buf_size || len < 12)
1276 goto redo;
1277 /* get the data */
1278 ret = url_readbuf(rt->rtsp_hd, buf, len);
1279 if (ret != len)
1280 return -1;
1281 if (rt->transport == RTSP_TRANSPORT_RDT &&
1282 ff_rdt_parse_header(buf, len, &id, NULL, NULL, NULL) < 0)
1283 return -1;
1284
1285 /* find the matching stream */
1286 for(i = 0; i < rt->nb_rtsp_streams; i++) {
1287 rtsp_st = rt->rtsp_streams[i];
1288 if (id >= rtsp_st->interleaved_min &&
1289 id <= rtsp_st->interleaved_max)
1290 goto found;
1291 }
1292 goto redo;
1293 found:
1294 *prtsp_st = rtsp_st;
1295 return len;
1296 }
1297
1298 static int udp_read_packet(AVFormatContext *s, RTSPStream **prtsp_st,
1299 uint8_t *buf, int buf_size)
1300 {
1301 RTSPState *rt = s->priv_data;
1302 RTSPStream *rtsp_st;
1303 fd_set rfds;
1304 int fd1, fd2, fd_max, n, i, ret;
1305 struct timeval tv;
1306
1307 for(;;) {
1308 if (url_interrupt_cb())
1309 return AVERROR(EINTR);
1310 FD_ZERO(&rfds);
1311 fd_max = -1;
1312 for(i = 0; i < rt->nb_rtsp_streams; i++) {
1313 rtsp_st = rt->rtsp_streams[i];
1314 /* currently, we cannot probe RTCP handle because of blocking restrictions */
1315 rtp_get_file_handles(rtsp_st->rtp_handle, &fd1, &fd2);
1316 if (fd1 > fd_max)
1317 fd_max = fd1;
1318 FD_SET(fd1, &rfds);
1319 }
1320 tv.tv_sec = 0;
1321 tv.tv_usec = 100 * 1000;
1322 n = select(fd_max + 1, &rfds, NULL, NULL, &tv);
1323 if (n > 0) {
1324 for(i = 0; i < rt->nb_rtsp_streams; i++) {
1325 rtsp_st = rt->rtsp_streams[i];
1326 rtp_get_file_handles(rtsp_st->rtp_handle, &fd1, &fd2);
1327 if (FD_ISSET(fd1, &rfds)) {
1328 ret = url_read(rtsp_st->rtp_handle, buf, buf_size);
1329 if (ret > 0) {
1330 *prtsp_st = rtsp_st;
1331 return ret;
1332 }
1333 }
1334 }
1335 }
1336 }
1337 }
1338
1339 static int rtsp_read_packet(AVFormatContext *s,
1340 AVPacket *pkt)
1341 {
1342 RTSPState *rt = s->priv_data;
1343 RTSPStream *rtsp_st;
1344 int ret, len;
1345 uint8_t buf[RTP_MAX_PACKET_LENGTH];
1346
1347 if (rt->server_type == RTSP_SERVER_REAL && rt->need_subscription) {
1348 int i;
1349 RTSPHeader reply1, *reply = &reply1;
1350 char cmd[1024];
1351
1352 snprintf(cmd, sizeof(cmd),
1353 "SET_PARAMETER %s RTSP/1.0\r\n"
1354 "Subscribe: ",
1355 s->filename);
1356 for (i = 0; i < rt->nb_rtsp_streams; i++) {
1357 if (i != 0) av_strlcat(cmd, ",", sizeof(cmd));
1358 ff_rdt_subscribe_rule(cmd, sizeof(cmd), i, 0);
1359 if (rt->transport == RTSP_TRANSPORT_RDT)
1360 ff_rdt_subscribe_rule2(
1361 rt->rtsp_streams[i]->tx_ctx,
1362 cmd, sizeof(cmd), i, 0);
1363 }
1364 av_strlcat(cmd, "\r\n", sizeof(cmd));
1365 rtsp_send_cmd(s, cmd, reply, NULL);
1366 if (reply->status_code != RTSP_STATUS_OK)
1367 return AVERROR_INVALIDDATA;
1368 rt->need_subscription = 0;
1369
1370 if (rt->state == RTSP_STATE_PLAYING)
1371 rtsp_read_play (s);
1372 }
1373
1374 /* get next frames from the same RTP packet */
1375 if (rt->cur_tx) {
1376 if (rt->transport == RTSP_TRANSPORT_RDT)
1377 ret = ff_rdt_parse_packet(rt->cur_tx, pkt, NULL, 0);
1378 else
1379 ret = rtp_parse_packet(rt->cur_tx, pkt, NULL, 0);
1380 if (ret == 0) {
1381 rt->cur_tx = NULL;
1382 return 0;
1383 } else if (ret == 1) {
1384 return 0;
1385 } else {
1386 rt->cur_tx = NULL;
1387 }
1388 }
1389
1390 /* read next RTP packet */
1391 redo:
1392 switch(rt->lower_transport) {
1393 default:
1394 case RTSP_LOWER_TRANSPORT_TCP:
1395 len = tcp_read_packet(s, &rtsp_st, buf, sizeof(buf));
1396 break;
1397 case RTSP_LOWER_TRANSPORT_UDP:
1398 case RTSP_LOWER_TRANSPORT_UDP_MULTICAST:
1399 len = udp_read_packet(s, &rtsp_st, buf, sizeof(buf));
1400 if (len >=0 && rtsp_st->tx_ctx)
1401 rtp_check_and_send_back_rr(rtsp_st->tx_ctx, len);
1402 break;
1403 }
1404 if (len < 0)
1405 return len;
1406 if (rt->transport == RTSP_TRANSPORT_RDT)
1407 ret = ff_rdt_parse_packet(rtsp_st->tx_ctx, pkt, buf, len);
1408 else
1409 ret = rtp_parse_packet(rtsp_st->tx_ctx, pkt, buf, len);
1410 if (ret < 0)
1411 goto redo;
1412 if (ret == 1) {
1413 /* more packets may follow, so we save the RTP context */
1414 rt->cur_tx = rtsp_st->tx_ctx;
1415 }
1416 return 0;
1417 }
1418
1419 static int rtsp_read_play(AVFormatContext *s)
1420 {
1421 RTSPState *rt = s->priv_data;
1422 RTSPHeader reply1, *reply = &reply1;
1423 char cmd[1024];
1424
1425 av_log(s, AV_LOG_DEBUG, "hello state=%d\n", rt->state);
1426
1427 if (!(rt->server_type == RTSP_SERVER_REAL && rt->need_subscription)) {
1428 if (rt->state == RTSP_STATE_PAUSED) {
1429 snprintf(cmd, sizeof(cmd),
1430 "PLAY %s RTSP/1.0\r\n",
1431 s->filename);
1432 } else {
1433 snprintf(cmd, sizeof(cmd),
1434 "PLAY %s RTSP/1.0\r\n"
1435 "Range: npt=%0.3f-\r\n",
1436 s->filename,
1437 (double)rt->seek_timestamp / AV_TIME_BASE);
1438 }
1439 rtsp_send_cmd(s, cmd, reply, NULL);
1440 if (reply->status_code != RTSP_STATUS_OK) {
1441 return -1;
1442 }
1443 }
1444 rt->state = RTSP_STATE_PLAYING;
1445 return 0;
1446 }
1447
1448 /* pause the stream */
1449 static int rtsp_read_pause(AVFormatContext *s)
1450 {
1451 RTSPState *rt = s->priv_data;
1452 RTSPHeader reply1, *reply = &reply1;
1453 char cmd[1024];
1454
1455 rt = s->priv_data;
1456
1457 if (rt->state != RTSP_STATE_PLAYING)
1458 return 0;
1459 else if (!(rt->server_type == RTSP_SERVER_REAL && rt->need_subscription)) {
1460 snprintf(cmd, sizeof(cmd),
1461 "PAUSE %s RTSP/1.0\r\n",
1462 s->filename);
1463 rtsp_send_cmd(s, cmd, reply, NULL);
1464 if (reply->status_code != RTSP_STATUS_OK) {
1465 return -1;
1466 }
1467 }
1468 rt->state = RTSP_STATE_PAUSED;
1469 return 0;
1470 }
1471
1472 static int rtsp_read_seek(AVFormatContext *s, int stream_index,
1473 int64_t timestamp, int flags)
1474 {
1475 RTSPState *rt = s->priv_data;
1476
1477 rt->seek_timestamp = av_rescale_q(timestamp, s->streams[stream_index]->time_base, AV_TIME_BASE_Q);
1478 switch(rt->state) {
1479 default:
1480 case RTSP_STATE_IDLE:
1481 break;
1482 case RTSP_STATE_PLAYING:
1483 if (rtsp_read_play(s) != 0)
1484 return -1;
1485 break;
1486 case RTSP_STATE_PAUSED:
1487 rt->state = RTSP_STATE_IDLE;
1488 break;
1489 }
1490 return 0;
1491 }
1492
1493 static int rtsp_read_close(AVFormatContext *s)
1494 {
1495 RTSPState *rt = s->priv_data;
1496 RTSPHeader reply1, *reply = &reply1;
1497 char cmd[1024];
1498
1499 #if 0
1500 /* NOTE: it is valid to flush the buffer here */
1501 if (rt->lower_transport == RTSP_LOWER_TRANSPORT_TCP) {
1502 url_fclose(&rt->rtsp_gb);
1503 }
1504 #endif
1505 snprintf(cmd, sizeof(cmd),
1506 "TEARDOWN %s RTSP/1.0\r\n",
1507 s->filename);
1508 rtsp_send_cmd(s, cmd, reply, NULL);
1509
1510 rtsp_close_streams(rt);
1511 url_close(rt->rtsp_hd);
1512 return 0;
1513 }
1514
1515 #ifdef CONFIG_RTSP_DEMUXER
1516 AVInputFormat rtsp_demuxer = {
1517 "rtsp",
1518 NULL_IF_CONFIG_SMALL("RTSP input format"),
1519 sizeof(RTSPState),
1520 rtsp_probe,
1521 rtsp_read_header,
1522 rtsp_read_packet,
1523 rtsp_read_close,
1524 rtsp_read_seek,
1525 .flags = AVFMT_NOFILE,
1526 .read_play = rtsp_read_play,
1527 .read_pause = rtsp_read_pause,
1528 };
1529 #endif
1530
1531 static int sdp_probe(AVProbeData *p1)
1532 {
1533 const char *p = p1->buf, *p_end = p1->buf + p1->buf_size;
1534
1535 /* we look for a line beginning "c=IN IP4" */
1536 while (p < p_end && *p != '\0') {
1537 if (p + sizeof("c=IN IP4") - 1 < p_end && av_strstart(p, "c=IN IP4", NULL))
1538 return AVPROBE_SCORE_MAX / 2;
1539
1540 while(p < p_end - 1 && *p != '\n') p++;
1541 if (++p >= p_end)
1542 break;
1543 if (*p == '\r')
1544 p++;
1545 }
1546 return 0;
1547 }
1548
1549 #define SDP_MAX_SIZE 8192
1550
1551 static int sdp_read_header(AVFormatContext *s,
1552 AVFormatParameters *ap)
1553 {
1554 RTSPState *rt = s->priv_data;
1555 RTSPStream *rtsp_st;
1556 int size, i, err;
1557 char *content;
1558 char url[1024];
1559
1560 /* read the whole sdp file */
1561 /* XXX: better loading */
1562 content = av_malloc(SDP_MAX_SIZE);
1563 size = get_buffer(s->pb, content, SDP_MAX_SIZE - 1);
1564 if (size <= 0) {
1565 av_free(content);
1566 return AVERROR_INVALIDDATA;
1567 }
1568 content[size] ='\0';
1569
1570 sdp_parse(s, content);
1571 av_free(content);
1572
1573 /* open each RTP stream */
1574 for(i=0;i<rt->nb_rtsp_streams;i++) {
1575 rtsp_st = rt->rtsp_streams[i];
1576
1577 snprintf(url, sizeof(url), "rtp://%s:%d?localport=%d&ttl=%d",
1578 inet_ntoa(rtsp_st->sdp_ip),
1579 rtsp_st->sdp_port,
1580 rtsp_st->sdp_port,
1581 rtsp_st->sdp_ttl);
1582 if (url_open(&rtsp_st->rtp_handle, url, URL_RDWR) < 0) {
1583 err = AVERROR_INVALIDDATA;
1584 goto fail;
1585 }
1586 if ((err = rtsp_open_transport_ctx(s, rtsp_st)))
1587 goto fail;
1588 }
1589 return 0;
1590 fail:
1591 rtsp_close_streams(rt);
1592 return err;
1593 }
1594
1595 static int sdp_read_packet(AVFormatContext *s,
1596 AVPacket *pkt)
1597 {
1598 return rtsp_read_packet(s, pkt);
1599 }
1600
1601 static int sdp_read_close(AVFormatContext *s)
1602 {
1603 RTSPState *rt = s->priv_data;
1604 rtsp_close_streams(rt);
1605 return 0;
1606 }
1607
1608 #ifdef CONFIG_SDP_DEMUXER
1609 AVInputFormat sdp_demuxer = {
1610 "sdp",
1611 NULL_IF_CONFIG_SMALL("SDP"),
1612 sizeof(RTSPState),
1613 sdp_probe,
1614 sdp_read_header,
1615 sdp_read_packet,
1616 sdp_read_close,
1617 };
1618 #endif
1619
1620 #ifdef CONFIG_REDIR_DEMUXER
1621 /* dummy redirector format (used directly in av_open_input_file now) */
1622 static int redir_probe(AVProbeData *pd)
1623 {
1624 const char *p;
1625 p = pd->buf;
1626 while (redir_isspace(*p))
1627 p++;
1628 if (av_strstart(p, "http://", NULL) ||
1629 av_strstart(p, "rtsp://", NULL))
1630 return AVPROBE_SCORE_MAX;
1631 return 0;
1632 }
1633
1634 static int redir_read_header(AVFormatContext *s, AVFormatParameters *ap)
1635 {
1636 char buf[4096], *q;
1637 int c;
1638 AVFormatContext *ic = NULL;
1639 ByteIOContext *f = s->pb;
1640
1641 /* parse each URL and try to open it */
1642 c = url_fgetc(f);
1643 while (c != URL_EOF) {
1644 /* skip spaces */
1645 for(;;) {
1646 if (!redir_isspace(c))
1647 break;
1648 c = url_fgetc(f);
1649 }
1650 if (c == URL_EOF)
1651 break;
1652 /* record url */
1653 q = buf;
1654 for(;;) {
1655 if (c == URL_EOF || redir_isspace(c))
1656 break;
1657 if ((q - buf) < sizeof(buf) - 1)
1658 *q++ = c;
1659 c = url_fgetc(f);
1660 }
1661 *q = '\0';
1662 //printf("URL='%s'\n", buf);
1663 /* try to open the media file */
1664 if (av_open_input_file(&ic, buf, NULL, 0, NULL) == 0)
1665 break;
1666 }
1667 if (!ic)
1668 return AVERROR(EIO);
1669
1670 *s = *ic;
1671 url_fclose(f);
1672
1673 return 0;
1674 }
1675
1676 AVInputFormat redir_demuxer = {
1677 "redir",
1678 NULL_IF_CONFIG_SMALL("Redirector format"),
1679 0,
1680 redir_probe,
1681 redir_read_header,
1682 NULL,
1683 NULL,
1684 };
1685 #endif