RTSP: Add a second URLContext for outgoing messages
[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 #include "libavutil/base64.h"
23 #include "libavutil/avstring.h"
24 #include "libavutil/intreadwrite.h"
25 #include "avformat.h"
26
27 #include <sys/time.h>
28 #if HAVE_SYS_SELECT_H
29 #include <sys/select.h>
30 #endif
31 #include <strings.h>
32 #include "internal.h"
33 #include "network.h"
34 #include "os_support.h"
35 #include "rtsp.h"
36
37 #include "rtpdec.h"
38 #include "rdt.h"
39 #include "rtpdec_asf.h"
40
41 //#define DEBUG
42 //#define DEBUG_RTP_TCP
43
44 #if LIBAVFORMAT_VERSION_INT < (53 << 16)
45 int rtsp_default_protocols = (1 << RTSP_LOWER_TRANSPORT_UDP);
46 #endif
47
48 /* Timeout values for socket select, in ms,
49 * and read_packet(), in seconds */
50 #define SELECT_TIMEOUT_MS 100
51 #define READ_PACKET_TIMEOUT_S 10
52 #define MAX_TIMEOUTS READ_PACKET_TIMEOUT_S * 1000 / SELECT_TIMEOUT_MS
53
54 #define SPACE_CHARS " \t\r\n"
55 /* we use memchr() instead of strchr() here because strchr() will return
56 * the terminating '\0' of SPACE_CHARS instead of NULL if c is '\0'. */
57 #define redir_isspace(c) memchr(SPACE_CHARS, c, 4)
58 static void skip_spaces(const char **pp)
59 {
60 const char *p;
61 p = *pp;
62 while (redir_isspace(*p))
63 p++;
64 *pp = p;
65 }
66
67 static void get_word_until_chars(char *buf, int buf_size,
68 const char *sep, const char **pp)
69 {
70 const char *p;
71 char *q;
72
73 p = *pp;
74 skip_spaces(&p);
75 q = buf;
76 while (!strchr(sep, *p) && *p != '\0') {
77 if ((q - buf) < buf_size - 1)
78 *q++ = *p;
79 p++;
80 }
81 if (buf_size > 0)
82 *q = '\0';
83 *pp = p;
84 }
85
86 static void get_word_sep(char *buf, int buf_size, const char *sep,
87 const char **pp)
88 {
89 if (**pp == '/') (*pp)++;
90 get_word_until_chars(buf, buf_size, sep, pp);
91 }
92
93 static void get_word(char *buf, int buf_size, const char **pp)
94 {
95 get_word_until_chars(buf, buf_size, SPACE_CHARS, pp);
96 }
97
98 /* parse the rtpmap description: <codec_name>/<clock_rate>[/<other params>] */
99 static int sdp_parse_rtpmap(AVFormatContext *s,
100 AVCodecContext *codec, RTSPStream *rtsp_st,
101 int payload_type, const char *p)
102 {
103 char buf[256];
104 int i;
105 AVCodec *c;
106 const char *c_name;
107
108 /* Loop into AVRtpDynamicPayloadTypes[] and AVRtpPayloadTypes[] and
109 * see if we can handle this kind of payload.
110 * The space should normally not be there but some Real streams or
111 * particular servers ("RealServer Version 6.1.3.970", see issue 1658)
112 * have a trailing space. */
113 get_word_sep(buf, sizeof(buf), "/ ", &p);
114 if (payload_type >= RTP_PT_PRIVATE) {
115 RTPDynamicProtocolHandler *handler;
116 for (handler = RTPFirstDynamicPayloadHandler;
117 handler; handler = handler->next) {
118 if (!strcasecmp(buf, handler->enc_name) &&
119 codec->codec_type == handler->codec_type) {
120 codec->codec_id = handler->codec_id;
121 rtsp_st->dynamic_handler = handler;
122 if (handler->open)
123 rtsp_st->dynamic_protocol_context = handler->open();
124 break;
125 }
126 }
127 } else {
128 /* We are in a standard case
129 * (from http://www.iana.org/assignments/rtp-parameters). */
130 /* search into AVRtpPayloadTypes[] */
131 codec->codec_id = ff_rtp_codec_id(buf, codec->codec_type);
132 }
133
134 c = avcodec_find_decoder(codec->codec_id);
135 if (c && c->name)
136 c_name = c->name;
137 else
138 c_name = "(null)";
139
140 get_word_sep(buf, sizeof(buf), "/", &p);
141 i = atoi(buf);
142 switch (codec->codec_type) {
143 case AVMEDIA_TYPE_AUDIO:
144 av_log(s, AV_LOG_DEBUG, "audio codec set to: %s\n", c_name);
145 codec->sample_rate = RTSP_DEFAULT_AUDIO_SAMPLERATE;
146 codec->channels = RTSP_DEFAULT_NB_AUDIO_CHANNELS;
147 if (i > 0) {
148 codec->sample_rate = i;
149 get_word_sep(buf, sizeof(buf), "/", &p);
150 i = atoi(buf);
151 if (i > 0)
152 codec->channels = i;
153 // TODO: there is a bug here; if it is a mono stream, and
154 // less than 22000Hz, faad upconverts to stereo and twice
155 // the frequency. No problem, but the sample rate is being
156 // set here by the sdp line. Patch on its way. (rdm)
157 }
158 av_log(s, AV_LOG_DEBUG, "audio samplerate set to: %i\n",
159 codec->sample_rate);
160 av_log(s, AV_LOG_DEBUG, "audio channels set to: %i\n",
161 codec->channels);
162 break;
163 case AVMEDIA_TYPE_VIDEO:
164 av_log(s, AV_LOG_DEBUG, "video codec set to: %s\n", c_name);
165 break;
166 default:
167 break;
168 }
169 return 0;
170 }
171
172 /* return the length and optionally the data */
173 static int hex_to_data(uint8_t *data, const char *p)
174 {
175 int c, len, v;
176
177 len = 0;
178 v = 1;
179 for (;;) {
180 skip_spaces(&p);
181 if (*p == '\0')
182 break;
183 c = toupper((unsigned char) *p++);
184 if (c >= '0' && c <= '9')
185 c = c - '0';
186 else if (c >= 'A' && c <= 'F')
187 c = c - 'A' + 10;
188 else
189 break;
190 v = (v << 4) | c;
191 if (v & 0x100) {
192 if (data)
193 data[len] = v;
194 len++;
195 v = 1;
196 }
197 }
198 return len;
199 }
200
201 static void sdp_parse_fmtp_config(AVCodecContext * codec, void *ctx,
202 char *attr, char *value)
203 {
204 switch (codec->codec_id) {
205 case CODEC_ID_MPEG4:
206 case CODEC_ID_AAC:
207 if (!strcmp(attr, "config")) {
208 /* decode the hexa encoded parameter */
209 int len = hex_to_data(NULL, value);
210 if (codec->extradata)
211 av_free(codec->extradata);
212 codec->extradata = av_mallocz(len + FF_INPUT_BUFFER_PADDING_SIZE);
213 if (!codec->extradata)
214 return;
215 codec->extradata_size = len;
216 hex_to_data(codec->extradata, value);
217 }
218 break;
219 default:
220 break;
221 }
222 return;
223 }
224
225 typedef struct {
226 const char *str;
227 uint16_t type;
228 uint32_t offset;
229 } AttrNameMap;
230
231 /* All known fmtp parameters and the corresponding RTPAttrTypeEnum */
232 #define ATTR_NAME_TYPE_INT 0
233 #define ATTR_NAME_TYPE_STR 1
234 static const AttrNameMap attr_names[]=
235 {
236 { "SizeLength", ATTR_NAME_TYPE_INT,
237 offsetof(RTPPayloadData, sizelength) },
238 { "IndexLength", ATTR_NAME_TYPE_INT,
239 offsetof(RTPPayloadData, indexlength) },
240 { "IndexDeltaLength", ATTR_NAME_TYPE_INT,
241 offsetof(RTPPayloadData, indexdeltalength) },
242 { "profile-level-id", ATTR_NAME_TYPE_INT,
243 offsetof(RTPPayloadData, profile_level_id) },
244 { "StreamType", ATTR_NAME_TYPE_INT,
245 offsetof(RTPPayloadData, streamtype) },
246 { "mode", ATTR_NAME_TYPE_STR,
247 offsetof(RTPPayloadData, mode) },
248 { NULL, -1, -1 },
249 };
250
251 /* parse the attribute line from the fmtp a line of an sdp response. This
252 * is broken out as a function because it is used in rtp_h264.c, which is
253 * forthcoming. */
254 int ff_rtsp_next_attr_and_value(const char **p, char *attr, int attr_size,
255 char *value, int value_size)
256 {
257 skip_spaces(p);
258 if (**p) {
259 get_word_sep(attr, attr_size, "=", p);
260 if (**p == '=')
261 (*p)++;
262 get_word_sep(value, value_size, ";", p);
263 if (**p == ';')
264 (*p)++;
265 return 1;
266 }
267 return 0;
268 }
269
270 /* parse a SDP line and save stream attributes */
271 static void sdp_parse_fmtp(AVStream *st, const char *p)
272 {
273 char attr[256];
274 /* Vorbis setup headers can be up to 12KB and are sent base64
275 * encoded, giving a 12KB * (4/3) = 16KB FMTP line. */
276 char value[16384];
277 int i;
278 RTSPStream *rtsp_st = st->priv_data;
279 AVCodecContext *codec = st->codec;
280 RTPPayloadData *rtp_payload_data = &rtsp_st->rtp_payload_data;
281
282 /* loop on each attribute */
283 while (ff_rtsp_next_attr_and_value(&p, attr, sizeof(attr),
284 value, sizeof(value))) {
285 /* grab the codec extra_data from the config parameter of the fmtp
286 * line */
287 sdp_parse_fmtp_config(codec, rtsp_st->dynamic_protocol_context,
288 attr, value);
289 /* Looking for a known attribute */
290 for (i = 0; attr_names[i].str; ++i) {
291 if (!strcasecmp(attr, attr_names[i].str)) {
292 if (attr_names[i].type == ATTR_NAME_TYPE_INT) {
293 *(int *)((char *)rtp_payload_data +
294 attr_names[i].offset) = atoi(value);
295 } else if (attr_names[i].type == ATTR_NAME_TYPE_STR)
296 *(char **)((char *)rtp_payload_data +
297 attr_names[i].offset) = av_strdup(value);
298 }
299 }
300 }
301 }
302
303 /** Parse a string p in the form of Range:npt=xx-xx, and determine the start
304 * and end time.
305 * Used for seeking in the rtp stream.
306 */
307 static void rtsp_parse_range_npt(const char *p, int64_t *start, int64_t *end)
308 {
309 char buf[256];
310
311 skip_spaces(&p);
312 if (!av_stristart(p, "npt=", &p))
313 return;
314
315 *start = AV_NOPTS_VALUE;
316 *end = AV_NOPTS_VALUE;
317
318 get_word_sep(buf, sizeof(buf), "-", &p);
319 *start = parse_date(buf, 1);
320 if (*p == '-') {
321 p++;
322 get_word_sep(buf, sizeof(buf), "-", &p);
323 *end = parse_date(buf, 1);
324 }
325 // av_log(NULL, AV_LOG_DEBUG, "Range Start: %lld\n", *start);
326 // av_log(NULL, AV_LOG_DEBUG, "Range End: %lld\n", *end);
327 }
328
329 typedef struct SDPParseState {
330 /* SDP only */
331 struct in_addr default_ip;
332 int default_ttl;
333 int skip_media; ///< set if an unknown m= line occurs
334 } SDPParseState;
335
336 static void sdp_parse_line(AVFormatContext *s, SDPParseState *s1,
337 int letter, const char *buf)
338 {
339 RTSPState *rt = s->priv_data;
340 char buf1[64], st_type[64];
341 const char *p;
342 enum AVMediaType codec_type;
343 int payload_type, i;
344 AVStream *st;
345 RTSPStream *rtsp_st;
346 struct in_addr sdp_ip;
347 int ttl;
348
349 dprintf(s, "sdp: %c='%s'\n", letter, buf);
350
351 p = buf;
352 if (s1->skip_media && letter != 'm')
353 return;
354 switch (letter) {
355 case 'c':
356 get_word(buf1, sizeof(buf1), &p);
357 if (strcmp(buf1, "IN") != 0)
358 return;
359 get_word(buf1, sizeof(buf1), &p);
360 if (strcmp(buf1, "IP4") != 0)
361 return;
362 get_word_sep(buf1, sizeof(buf1), "/", &p);
363 if (ff_inet_aton(buf1, &sdp_ip) == 0)
364 return;
365 ttl = 16;
366 if (*p == '/') {
367 p++;
368 get_word_sep(buf1, sizeof(buf1), "/", &p);
369 ttl = atoi(buf1);
370 }
371 if (s->nb_streams == 0) {
372 s1->default_ip = sdp_ip;
373 s1->default_ttl = ttl;
374 } else {
375 st = s->streams[s->nb_streams - 1];
376 rtsp_st = st->priv_data;
377 rtsp_st->sdp_ip = sdp_ip;
378 rtsp_st->sdp_ttl = ttl;
379 }
380 break;
381 case 's':
382 av_metadata_set2(&s->metadata, "title", p, 0);
383 break;
384 case 'i':
385 if (s->nb_streams == 0) {
386 av_metadata_set2(&s->metadata, "comment", p, 0);
387 break;
388 }
389 break;
390 case 'm':
391 /* new stream */
392 s1->skip_media = 0;
393 get_word(st_type, sizeof(st_type), &p);
394 if (!strcmp(st_type, "audio")) {
395 codec_type = AVMEDIA_TYPE_AUDIO;
396 } else if (!strcmp(st_type, "video")) {
397 codec_type = AVMEDIA_TYPE_VIDEO;
398 } else if (!strcmp(st_type, "application")) {
399 codec_type = AVMEDIA_TYPE_DATA;
400 } else {
401 s1->skip_media = 1;
402 return;
403 }
404 rtsp_st = av_mallocz(sizeof(RTSPStream));
405 if (!rtsp_st)
406 return;
407 rtsp_st->stream_index = -1;
408 dynarray_add(&rt->rtsp_streams, &rt->nb_rtsp_streams, rtsp_st);
409
410 rtsp_st->sdp_ip = s1->default_ip;
411 rtsp_st->sdp_ttl = s1->default_ttl;
412
413 get_word(buf1, sizeof(buf1), &p); /* port */
414 rtsp_st->sdp_port = atoi(buf1);
415
416 get_word(buf1, sizeof(buf1), &p); /* protocol (ignored) */
417
418 /* XXX: handle list of formats */
419 get_word(buf1, sizeof(buf1), &p); /* format list */
420 rtsp_st->sdp_payload_type = atoi(buf1);
421
422 if (!strcmp(ff_rtp_enc_name(rtsp_st->sdp_payload_type), "MP2T")) {
423 /* no corresponding stream */
424 } else {
425 st = av_new_stream(s, 0);
426 if (!st)
427 return;
428 st->priv_data = rtsp_st;
429 rtsp_st->stream_index = st->index;
430 st->codec->codec_type = codec_type;
431 if (rtsp_st->sdp_payload_type < RTP_PT_PRIVATE) {
432 /* if standard payload type, we can find the codec right now */
433 ff_rtp_get_codec_info(st->codec, rtsp_st->sdp_payload_type);
434 }
435 }
436 /* put a default control url */
437 av_strlcpy(rtsp_st->control_url, rt->control_uri,
438 sizeof(rtsp_st->control_url));
439 break;
440 case 'a':
441 if (av_strstart(p, "control:", &p)) {
442 if (s->nb_streams == 0) {
443 if (!strncmp(p, "rtsp://", 7))
444 av_strlcpy(rt->control_uri, p,
445 sizeof(rt->control_uri));
446 } else {
447 char proto[32];
448 /* get the control url */
449 st = s->streams[s->nb_streams - 1];
450 rtsp_st = st->priv_data;
451
452 /* XXX: may need to add full url resolution */
453 ff_url_split(proto, sizeof(proto), NULL, 0, NULL, 0,
454 NULL, NULL, 0, p);
455 if (proto[0] == '\0') {
456 /* relative control URL */
457 if (rtsp_st->control_url[strlen(rtsp_st->control_url)-1]!='/')
458 av_strlcat(rtsp_st->control_url, "/",
459 sizeof(rtsp_st->control_url));
460 av_strlcat(rtsp_st->control_url, p,
461 sizeof(rtsp_st->control_url));
462 } else
463 av_strlcpy(rtsp_st->control_url, p,
464 sizeof(rtsp_st->control_url));
465 }
466 } else if (av_strstart(p, "rtpmap:", &p) && s->nb_streams > 0) {
467 /* NOTE: rtpmap is only supported AFTER the 'm=' tag */
468 get_word(buf1, sizeof(buf1), &p);
469 payload_type = atoi(buf1);
470 st = s->streams[s->nb_streams - 1];
471 rtsp_st = st->priv_data;
472 sdp_parse_rtpmap(s, st->codec, rtsp_st, payload_type, p);
473 } else if (av_strstart(p, "fmtp:", &p)) {
474 /* NOTE: fmtp is only supported AFTER the 'a=rtpmap:xxx' tag */
475 get_word(buf1, sizeof(buf1), &p);
476 payload_type = atoi(buf1);
477 for (i = 0; i < s->nb_streams; i++) {
478 st = s->streams[i];
479 rtsp_st = st->priv_data;
480 if (rtsp_st->sdp_payload_type == payload_type) {
481 if (!(rtsp_st->dynamic_handler &&
482 rtsp_st->dynamic_handler->parse_sdp_a_line &&
483 rtsp_st->dynamic_handler->parse_sdp_a_line(s,
484 i, rtsp_st->dynamic_protocol_context, buf)))
485 sdp_parse_fmtp(st, p);
486 }
487 }
488 } else if (av_strstart(p, "framesize:", &p)) {
489 // let dynamic protocol handlers have a stab at the line.
490 get_word(buf1, sizeof(buf1), &p);
491 payload_type = atoi(buf1);
492 for (i = 0; i < s->nb_streams; i++) {
493 st = s->streams[i];
494 rtsp_st = st->priv_data;
495 if (rtsp_st->sdp_payload_type == payload_type &&
496 rtsp_st->dynamic_handler &&
497 rtsp_st->dynamic_handler->parse_sdp_a_line)
498 rtsp_st->dynamic_handler->parse_sdp_a_line(s, i,
499 rtsp_st->dynamic_protocol_context, buf);
500 }
501 } else if (av_strstart(p, "range:", &p)) {
502 int64_t start, end;
503
504 // this is so that seeking on a streamed file can work.
505 rtsp_parse_range_npt(p, &start, &end);
506 s->start_time = start;
507 /* AV_NOPTS_VALUE means live broadcast (and can't seek) */
508 s->duration = (end == AV_NOPTS_VALUE) ?
509 AV_NOPTS_VALUE : end - start;
510 } else if (av_strstart(p, "IsRealDataType:integer;",&p)) {
511 if (atoi(p) == 1)
512 rt->transport = RTSP_TRANSPORT_RDT;
513 } else {
514 if (rt->server_type == RTSP_SERVER_WMS)
515 ff_wms_parse_sdp_a_line(s, p);
516 if (s->nb_streams > 0) {
517 if (rt->server_type == RTSP_SERVER_REAL)
518 ff_real_parse_sdp_a_line(s, s->nb_streams - 1, p);
519
520 rtsp_st = s->streams[s->nb_streams - 1]->priv_data;
521 if (rtsp_st->dynamic_handler &&
522 rtsp_st->dynamic_handler->parse_sdp_a_line)
523 rtsp_st->dynamic_handler->parse_sdp_a_line(s,
524 s->nb_streams - 1,
525 rtsp_st->dynamic_protocol_context, buf);
526 }
527 }
528 break;
529 }
530 }
531
532 static int sdp_parse(AVFormatContext *s, const char *content)
533 {
534 const char *p;
535 int letter;
536 /* Some SDP lines, particularly for Realmedia or ASF RTSP streams,
537 * contain long SDP lines containing complete ASF Headers (several
538 * kB) or arrays of MDPR (RM stream descriptor) headers plus
539 * "rulebooks" describing their properties. Therefore, the SDP line
540 * buffer is large.
541 *
542 * The Vorbis FMTP line can be up to 16KB - see sdp_parse_fmtp. */
543 char buf[16384], *q;
544 SDPParseState sdp_parse_state, *s1 = &sdp_parse_state;
545
546 memset(s1, 0, sizeof(SDPParseState));
547 p = content;
548 for (;;) {
549 skip_spaces(&p);
550 letter = *p;
551 if (letter == '\0')
552 break;
553 p++;
554 if (*p != '=')
555 goto next_line;
556 p++;
557 /* get the content */
558 q = buf;
559 while (*p != '\n' && *p != '\r' && *p != '\0') {
560 if ((q - buf) < sizeof(buf) - 1)
561 *q++ = *p;
562 p++;
563 }
564 *q = '\0';
565 sdp_parse_line(s, s1, letter, buf);
566 next_line:
567 while (*p != '\n' && *p != '\0')
568 p++;
569 if (*p == '\n')
570 p++;
571 }
572 return 0;
573 }
574
575 /* close and free RTSP streams */
576 void ff_rtsp_close_streams(AVFormatContext *s)
577 {
578 RTSPState *rt = s->priv_data;
579 int i;
580 RTSPStream *rtsp_st;
581
582 for (i = 0; i < rt->nb_rtsp_streams; i++) {
583 rtsp_st = rt->rtsp_streams[i];
584 if (rtsp_st) {
585 if (rtsp_st->transport_priv) {
586 if (s->oformat) {
587 AVFormatContext *rtpctx = rtsp_st->transport_priv;
588 av_write_trailer(rtpctx);
589 if (rt->lower_transport == RTSP_LOWER_TRANSPORT_TCP) {
590 uint8_t *ptr;
591 url_close_dyn_buf(rtpctx->pb, &ptr);
592 av_free(ptr);
593 } else {
594 url_fclose(rtpctx->pb);
595 }
596 av_metadata_free(&rtpctx->streams[0]->metadata);
597 av_metadata_free(&rtpctx->metadata);
598 av_free(rtpctx->streams[0]);
599 av_free(rtpctx);
600 } else if (rt->transport == RTSP_TRANSPORT_RDT)
601 ff_rdt_parse_close(rtsp_st->transport_priv);
602 else
603 rtp_parse_close(rtsp_st->transport_priv);
604 }
605 if (rtsp_st->rtp_handle)
606 url_close(rtsp_st->rtp_handle);
607 if (rtsp_st->dynamic_handler && rtsp_st->dynamic_protocol_context)
608 rtsp_st->dynamic_handler->close(
609 rtsp_st->dynamic_protocol_context);
610 }
611 }
612 av_free(rt->rtsp_streams);
613 if (rt->asf_ctx) {
614 av_close_input_stream (rt->asf_ctx);
615 rt->asf_ctx = NULL;
616 }
617 }
618
619 static void *rtsp_rtp_mux_open(AVFormatContext *s, AVStream *st,
620 URLContext *handle)
621 {
622 RTSPState *rt = s->priv_data;
623 AVFormatContext *rtpctx;
624 int ret;
625 AVOutputFormat *rtp_format = av_guess_format("rtp", NULL, NULL);
626
627 if (!rtp_format)
628 return NULL;
629
630 /* Allocate an AVFormatContext for each output stream */
631 rtpctx = avformat_alloc_context();
632 if (!rtpctx)
633 return NULL;
634
635 rtpctx->oformat = rtp_format;
636 if (!av_new_stream(rtpctx, 0)) {
637 av_free(rtpctx);
638 return NULL;
639 }
640 /* Copy the max delay setting; the rtp muxer reads this. */
641 rtpctx->max_delay = s->max_delay;
642 /* Copy other stream parameters. */
643 rtpctx->streams[0]->sample_aspect_ratio = st->sample_aspect_ratio;
644
645 /* Set the synchronized start time. */
646 rtpctx->start_time_realtime = rt->start_time;
647
648 /* Remove the local codec, link to the original codec
649 * context instead, to give the rtp muxer access to
650 * codec parameters. */
651 av_free(rtpctx->streams[0]->codec);
652 rtpctx->streams[0]->codec = st->codec;
653
654 if (handle) {
655 url_fdopen(&rtpctx->pb, handle);
656 } else
657 url_open_dyn_packet_buf(&rtpctx->pb, RTSP_TCP_MAX_PACKET_SIZE);
658 ret = av_write_header(rtpctx);
659
660 if (ret) {
661 if (handle) {
662 url_fclose(rtpctx->pb);
663 } else {
664 uint8_t *ptr;
665 url_close_dyn_buf(rtpctx->pb, &ptr);
666 av_free(ptr);
667 }
668 av_free(rtpctx->streams[0]);
669 av_free(rtpctx);
670 return NULL;
671 }
672
673 /* Copy the RTP AVStream timebase back to the original AVStream */
674 st->time_base = rtpctx->streams[0]->time_base;
675 return rtpctx;
676 }
677
678 static int rtsp_open_transport_ctx(AVFormatContext *s, RTSPStream *rtsp_st)
679 {
680 RTSPState *rt = s->priv_data;
681 AVStream *st = NULL;
682
683 /* open the RTP context */
684 if (rtsp_st->stream_index >= 0)
685 st = s->streams[rtsp_st->stream_index];
686 if (!st)
687 s->ctx_flags |= AVFMTCTX_NOHEADER;
688
689 if (s->oformat) {
690 rtsp_st->transport_priv = rtsp_rtp_mux_open(s, st, rtsp_st->rtp_handle);
691 /* Ownership of rtp_handle is passed to the rtp mux context */
692 rtsp_st->rtp_handle = NULL;
693 } else if (rt->transport == RTSP_TRANSPORT_RDT)
694 rtsp_st->transport_priv = ff_rdt_parse_open(s, st->index,
695 rtsp_st->dynamic_protocol_context,
696 rtsp_st->dynamic_handler);
697 else
698 rtsp_st->transport_priv = rtp_parse_open(s, st, rtsp_st->rtp_handle,
699 rtsp_st->sdp_payload_type,
700 &rtsp_st->rtp_payload_data);
701
702 if (!rtsp_st->transport_priv) {
703 return AVERROR(ENOMEM);
704 } else if (rt->transport != RTSP_TRANSPORT_RDT) {
705 if (rtsp_st->dynamic_handler) {
706 rtp_parse_set_dynamic_protocol(rtsp_st->transport_priv,
707 rtsp_st->dynamic_protocol_context,
708 rtsp_st->dynamic_handler);
709 }
710 }
711
712 return 0;
713 }
714
715 #if CONFIG_RTSP_DEMUXER || CONFIG_RTSP_MUXER
716 static int rtsp_probe(AVProbeData *p)
717 {
718 if (av_strstart(p->filename, "rtsp:", NULL))
719 return AVPROBE_SCORE_MAX;
720 return 0;
721 }
722
723 static void rtsp_parse_range(int *min_ptr, int *max_ptr, const char **pp)
724 {
725 const char *p;
726 int v;
727
728 p = *pp;
729 skip_spaces(&p);
730 v = strtol(p, (char **)&p, 10);
731 if (*p == '-') {
732 p++;
733 *min_ptr = v;
734 v = strtol(p, (char **)&p, 10);
735 *max_ptr = v;
736 } else {
737 *min_ptr = v;
738 *max_ptr = v;
739 }
740 *pp = p;
741 }
742
743 /* XXX: only one transport specification is parsed */
744 static void rtsp_parse_transport(RTSPMessageHeader *reply, const char *p)
745 {
746 char transport_protocol[16];
747 char profile[16];
748 char lower_transport[16];
749 char parameter[16];
750 RTSPTransportField *th;
751 char buf[256];
752
753 reply->nb_transports = 0;
754
755 for (;;) {
756 skip_spaces(&p);
757 if (*p == '\0')
758 break;
759
760 th = &reply->transports[reply->nb_transports];
761
762 get_word_sep(transport_protocol, sizeof(transport_protocol),
763 "/", &p);
764 if (!strcasecmp (transport_protocol, "rtp")) {
765 get_word_sep(profile, sizeof(profile), "/;,", &p);
766 lower_transport[0] = '\0';
767 /* rtp/avp/<protocol> */
768 if (*p == '/') {
769 get_word_sep(lower_transport, sizeof(lower_transport),
770 ";,", &p);
771 }
772 th->transport = RTSP_TRANSPORT_RTP;
773 } else if (!strcasecmp (transport_protocol, "x-pn-tng") ||
774 !strcasecmp (transport_protocol, "x-real-rdt")) {
775 /* x-pn-tng/<protocol> */
776 get_word_sep(lower_transport, sizeof(lower_transport), "/;,", &p);
777 profile[0] = '\0';
778 th->transport = RTSP_TRANSPORT_RDT;
779 }
780 if (!strcasecmp(lower_transport, "TCP"))
781 th->lower_transport = RTSP_LOWER_TRANSPORT_TCP;
782 else
783 th->lower_transport = RTSP_LOWER_TRANSPORT_UDP;
784
785 if (*p == ';')
786 p++;
787 /* get each parameter */
788 while (*p != '\0' && *p != ',') {
789 get_word_sep(parameter, sizeof(parameter), "=;,", &p);
790 if (!strcmp(parameter, "port")) {
791 if (*p == '=') {
792 p++;
793 rtsp_parse_range(&th->port_min, &th->port_max, &p);
794 }
795 } else if (!strcmp(parameter, "client_port")) {
796 if (*p == '=') {
797 p++;
798 rtsp_parse_range(&th->client_port_min,
799 &th->client_port_max, &p);
800 }
801 } else if (!strcmp(parameter, "server_port")) {
802 if (*p == '=') {
803 p++;
804 rtsp_parse_range(&th->server_port_min,
805 &th->server_port_max, &p);
806 }
807 } else if (!strcmp(parameter, "interleaved")) {
808 if (*p == '=') {
809 p++;
810 rtsp_parse_range(&th->interleaved_min,
811 &th->interleaved_max, &p);
812 }
813 } else if (!strcmp(parameter, "multicast")) {
814 if (th->lower_transport == RTSP_LOWER_TRANSPORT_UDP)
815 th->lower_transport = RTSP_LOWER_TRANSPORT_UDP_MULTICAST;
816 } else if (!strcmp(parameter, "ttl")) {
817 if (*p == '=') {
818 p++;
819 th->ttl = strtol(p, (char **)&p, 10);
820 }
821 } else if (!strcmp(parameter, "destination")) {
822 struct in_addr ipaddr;
823
824 if (*p == '=') {
825 p++;
826 get_word_sep(buf, sizeof(buf), ";,", &p);
827 if (ff_inet_aton(buf, &ipaddr))
828 th->destination = ntohl(ipaddr.s_addr);
829 }
830 }
831 while (*p != ';' && *p != '\0' && *p != ',')
832 p++;
833 if (*p == ';')
834 p++;
835 }
836 if (*p == ',')
837 p++;
838
839 reply->nb_transports++;
840 }
841 }
842
843 void ff_rtsp_parse_line(RTSPMessageHeader *reply, const char *buf,
844 HTTPAuthState *auth_state)
845 {
846 const char *p;
847
848 /* NOTE: we do case independent match for broken servers */
849 p = buf;
850 if (av_stristart(p, "Session:", &p)) {
851 int t;
852 get_word_sep(reply->session_id, sizeof(reply->session_id), ";", &p);
853 if (av_stristart(p, ";timeout=", &p) &&
854 (t = strtol(p, NULL, 10)) > 0) {
855 reply->timeout = t;
856 }
857 } else if (av_stristart(p, "Content-Length:", &p)) {
858 reply->content_length = strtol(p, NULL, 10);
859 } else if (av_stristart(p, "Transport:", &p)) {
860 rtsp_parse_transport(reply, p);
861 } else if (av_stristart(p, "CSeq:", &p)) {
862 reply->seq = strtol(p, NULL, 10);
863 } else if (av_stristart(p, "Range:", &p)) {
864 rtsp_parse_range_npt(p, &reply->range_start, &reply->range_end);
865 } else if (av_stristart(p, "RealChallenge1:", &p)) {
866 skip_spaces(&p);
867 av_strlcpy(reply->real_challenge, p, sizeof(reply->real_challenge));
868 } else if (av_stristart(p, "Server:", &p)) {
869 skip_spaces(&p);
870 av_strlcpy(reply->server, p, sizeof(reply->server));
871 } else if (av_stristart(p, "Notice:", &p) ||
872 av_stristart(p, "X-Notice:", &p)) {
873 reply->notice = strtol(p, NULL, 10);
874 } else if (av_stristart(p, "Location:", &p)) {
875 skip_spaces(&p);
876 av_strlcpy(reply->location, p , sizeof(reply->location));
877 } else if (av_stristart(p, "WWW-Authenticate:", &p) && auth_state) {
878 skip_spaces(&p);
879 ff_http_auth_handle_header(auth_state, "WWW-Authenticate", p);
880 } else if (av_stristart(p, "Authentication-Info:", &p) && auth_state) {
881 skip_spaces(&p);
882 ff_http_auth_handle_header(auth_state, "Authentication-Info", p);
883 }
884 }
885
886 /* skip a RTP/TCP interleaved packet */
887 void ff_rtsp_skip_packet(AVFormatContext *s)
888 {
889 RTSPState *rt = s->priv_data;
890 int ret, len, len1;
891 uint8_t buf[1024];
892
893 ret = url_read_complete(rt->rtsp_hd, buf, 3);
894 if (ret != 3)
895 return;
896 len = AV_RB16(buf + 1);
897
898 dprintf(s, "skipping RTP packet len=%d\n", len);
899
900 /* skip payload */
901 while (len > 0) {
902 len1 = len;
903 if (len1 > sizeof(buf))
904 len1 = sizeof(buf);
905 ret = url_read_complete(rt->rtsp_hd, buf, len1);
906 if (ret != len1)
907 return;
908 len -= len1;
909 }
910 }
911
912 int ff_rtsp_read_reply(AVFormatContext *s, RTSPMessageHeader *reply,
913 unsigned char **content_ptr,
914 int return_on_interleaved_data)
915 {
916 RTSPState *rt = s->priv_data;
917 char buf[4096], buf1[1024], *q;
918 unsigned char ch;
919 const char *p;
920 int ret, content_length, line_count = 0;
921 unsigned char *content = NULL;
922
923 memset(reply, 0, sizeof(*reply));
924
925 /* parse reply (XXX: use buffers) */
926 rt->last_reply[0] = '\0';
927 for (;;) {
928 q = buf;
929 for (;;) {
930 ret = url_read_complete(rt->rtsp_hd, &ch, 1);
931 #ifdef DEBUG_RTP_TCP
932 dprintf(s, "ret=%d c=%02x [%c]\n", ret, ch, ch);
933 #endif
934 if (ret != 1)
935 return -1;
936 if (ch == '\n')
937 break;
938 if (ch == '$') {
939 /* XXX: only parse it if first char on line ? */
940 if (return_on_interleaved_data) {
941 return 1;
942 } else
943 ff_rtsp_skip_packet(s);
944 } else if (ch != '\r') {
945 if ((q - buf) < sizeof(buf) - 1)
946 *q++ = ch;
947 }
948 }
949 *q = '\0';
950
951 dprintf(s, "line='%s'\n", buf);
952
953 /* test if last line */
954 if (buf[0] == '\0')
955 break;
956 p = buf;
957 if (line_count == 0) {
958 /* get reply code */
959 get_word(buf1, sizeof(buf1), &p);
960 get_word(buf1, sizeof(buf1), &p);
961 reply->status_code = atoi(buf1);
962 } else {
963 ff_rtsp_parse_line(reply, p, &rt->auth_state);
964 av_strlcat(rt->last_reply, p, sizeof(rt->last_reply));
965 av_strlcat(rt->last_reply, "\n", sizeof(rt->last_reply));
966 }
967 line_count++;
968 }
969
970 if (rt->session_id[0] == '\0' && reply->session_id[0] != '\0')
971 av_strlcpy(rt->session_id, reply->session_id, sizeof(rt->session_id));
972
973 content_length = reply->content_length;
974 if (content_length > 0) {
975 /* leave some room for a trailing '\0' (useful for simple parsing) */
976 content = av_malloc(content_length + 1);
977 (void)url_read_complete(rt->rtsp_hd, content, content_length);
978 content[content_length] = '\0';
979 }
980 if (content_ptr)
981 *content_ptr = content;
982 else
983 av_free(content);
984
985 if (rt->seq != reply->seq) {
986 av_log(s, AV_LOG_WARNING, "CSeq %d expected, %d received.\n",
987 rt->seq, reply->seq);
988 }
989
990 /* EOS */
991 if (reply->notice == 2101 /* End-of-Stream Reached */ ||
992 reply->notice == 2104 /* Start-of-Stream Reached */ ||
993 reply->notice == 2306 /* Continuous Feed Terminated */) {
994 rt->state = RTSP_STATE_IDLE;
995 } else if (reply->notice >= 4400 && reply->notice < 5500) {
996 return AVERROR(EIO); /* data or server error */
997 } else if (reply->notice == 2401 /* Ticket Expired */ ||
998 (reply->notice >= 5500 && reply->notice < 5600) /* end of term */ )
999 return AVERROR(EPERM);
1000
1001 return 0;
1002 }
1003
1004 void ff_rtsp_send_cmd_with_content_async(AVFormatContext *s,
1005 const char *method, const char *url,
1006 const char *headers,
1007 const unsigned char *send_content,
1008 int send_content_length)
1009 {
1010 RTSPState *rt = s->priv_data;
1011 char buf[4096];
1012
1013 rt->seq++;
1014 snprintf(buf, sizeof(buf), "%s %s RTSP/1.0\r\n", method, url);
1015 if (headers)
1016 av_strlcat(buf, headers, sizeof(buf));
1017 av_strlcatf(buf, sizeof(buf), "CSeq: %d\r\n", rt->seq);
1018 if (rt->session_id[0] != '\0' && (!headers ||
1019 !strstr(headers, "\nIf-Match:"))) {
1020 av_strlcatf(buf, sizeof(buf), "Session: %s\r\n", rt->session_id);
1021 }
1022 if (rt->auth[0]) {
1023 char *str = ff_http_auth_create_response(&rt->auth_state,
1024 rt->auth, url, method);
1025 if (str)
1026 av_strlcat(buf, str, sizeof(buf));
1027 av_free(str);
1028 }
1029 if (send_content_length > 0 && send_content)
1030 av_strlcatf(buf, sizeof(buf), "Content-Length: %d\r\n", send_content_length);
1031 av_strlcat(buf, "\r\n", sizeof(buf));
1032
1033 dprintf(s, "Sending:\n%s--\n", buf);
1034
1035 url_write(rt->rtsp_hd_out, buf, strlen(buf));
1036 if (send_content_length > 0 && send_content)
1037 url_write(rt->rtsp_hd_out, send_content, send_content_length);
1038 rt->last_cmd_time = av_gettime();
1039 }
1040
1041 void ff_rtsp_send_cmd_async(AVFormatContext *s, const char *method,
1042 const char *url, const char *headers)
1043 {
1044 ff_rtsp_send_cmd_with_content_async(s, method, url, headers, NULL, 0);
1045 }
1046
1047 void ff_rtsp_send_cmd(AVFormatContext *s, const char *method, const char *url,
1048 const char *headers, RTSPMessageHeader *reply,
1049 unsigned char **content_ptr)
1050 {
1051 ff_rtsp_send_cmd_with_content(s, method, url, headers, reply,
1052 content_ptr, NULL, 0);
1053 }
1054
1055 void ff_rtsp_send_cmd_with_content(AVFormatContext *s,
1056 const char *method, const char *url,
1057 const char *header,
1058 RTSPMessageHeader *reply,
1059 unsigned char **content_ptr,
1060 const unsigned char *send_content,
1061 int send_content_length)
1062 {
1063 RTSPState *rt = s->priv_data;
1064 HTTPAuthType cur_auth_type;
1065
1066 retry:
1067 cur_auth_type = rt->auth_state.auth_type;
1068 ff_rtsp_send_cmd_with_content_async(s, method, url, header,
1069 send_content, send_content_length);
1070
1071 ff_rtsp_read_reply(s, reply, content_ptr, 0);
1072
1073 if (reply->status_code == 401 && cur_auth_type == HTTP_AUTH_NONE &&
1074 rt->auth_state.auth_type != HTTP_AUTH_NONE)
1075 goto retry;
1076 }
1077
1078 /**
1079 * @return 0 on success, <0 on error, 1 if protocol is unavailable.
1080 */
1081 static int make_setup_request(AVFormatContext *s, const char *host, int port,
1082 int lower_transport, const char *real_challenge)
1083 {
1084 RTSPState *rt = s->priv_data;
1085 int rtx, j, i, err, interleave = 0;
1086 RTSPStream *rtsp_st;
1087 RTSPMessageHeader reply1, *reply = &reply1;
1088 char cmd[2048];
1089 const char *trans_pref;
1090
1091 if (rt->transport == RTSP_TRANSPORT_RDT)
1092 trans_pref = "x-pn-tng";
1093 else
1094 trans_pref = "RTP/AVP";
1095
1096 /* default timeout: 1 minute */
1097 rt->timeout = 60;
1098
1099 /* for each stream, make the setup request */
1100 /* XXX: we assume the same server is used for the control of each
1101 * RTSP stream */
1102
1103 for (j = RTSP_RTP_PORT_MIN, i = 0; i < rt->nb_rtsp_streams; ++i) {
1104 char transport[2048];
1105
1106 /**
1107 * WMS serves all UDP data over a single connection, the RTX, which
1108 * isn't necessarily the first in the SDP but has to be the first
1109 * to be set up, else the second/third SETUP will fail with a 461.
1110 */
1111 if (lower_transport == RTSP_LOWER_TRANSPORT_UDP &&
1112 rt->server_type == RTSP_SERVER_WMS) {
1113 if (i == 0) {
1114 /* rtx first */
1115 for (rtx = 0; rtx < rt->nb_rtsp_streams; rtx++) {
1116 int len = strlen(rt->rtsp_streams[rtx]->control_url);
1117 if (len >= 4 &&
1118 !strcmp(rt->rtsp_streams[rtx]->control_url + len - 4,
1119 "/rtx"))
1120 break;
1121 }
1122 if (rtx == rt->nb_rtsp_streams)
1123 return -1; /* no RTX found */
1124 rtsp_st = rt->rtsp_streams[rtx];
1125 } else
1126 rtsp_st = rt->rtsp_streams[i > rtx ? i : i - 1];
1127 } else
1128 rtsp_st = rt->rtsp_streams[i];
1129
1130 /* RTP/UDP */
1131 if (lower_transport == RTSP_LOWER_TRANSPORT_UDP) {
1132 char buf[256];
1133
1134 if (rt->server_type == RTSP_SERVER_WMS && i > 1) {
1135 port = reply->transports[0].client_port_min;
1136 goto have_port;
1137 }
1138
1139 /* first try in specified port range */
1140 if (RTSP_RTP_PORT_MIN != 0) {
1141 while (j <= RTSP_RTP_PORT_MAX) {
1142 ff_url_join(buf, sizeof(buf), "rtp", NULL, host, -1,
1143 "?localport=%d", j);
1144 /* we will use two ports per rtp stream (rtp and rtcp) */
1145 j += 2;
1146 if (url_open(&rtsp_st->rtp_handle, buf, URL_RDWR) == 0)
1147 goto rtp_opened;
1148 }
1149 }
1150
1151 #if 0
1152 /* then try on any port */
1153 if (url_open(&rtsp_st->rtp_handle, "rtp://", URL_RDONLY) < 0) {
1154 err = AVERROR_INVALIDDATA;
1155 goto fail;
1156 }
1157 #endif
1158
1159 rtp_opened:
1160 port = rtp_get_local_port(rtsp_st->rtp_handle);
1161 have_port:
1162 snprintf(transport, sizeof(transport) - 1,
1163 "%s/UDP;", trans_pref);
1164 if (rt->server_type != RTSP_SERVER_REAL)
1165 av_strlcat(transport, "unicast;", sizeof(transport));
1166 av_strlcatf(transport, sizeof(transport),
1167 "client_port=%d", port);
1168 if (rt->transport == RTSP_TRANSPORT_RTP &&
1169 !(rt->server_type == RTSP_SERVER_WMS && i > 0))
1170 av_strlcatf(transport, sizeof(transport), "-%d", port + 1);
1171 }
1172
1173 /* RTP/TCP */
1174 else if (lower_transport == RTSP_LOWER_TRANSPORT_TCP) {
1175 /** For WMS streams, the application streams are only used for
1176 * UDP. When trying to set it up for TCP streams, the server
1177 * will return an error. Therefore, we skip those streams. */
1178 if (rt->server_type == RTSP_SERVER_WMS &&
1179 s->streams[rtsp_st->stream_index]->codec->codec_type ==
1180 AVMEDIA_TYPE_DATA)
1181 continue;
1182 snprintf(transport, sizeof(transport) - 1,
1183 "%s/TCP;", trans_pref);
1184 if (rt->server_type == RTSP_SERVER_WMS)
1185 av_strlcat(transport, "unicast;", sizeof(transport));
1186 av_strlcatf(transport, sizeof(transport),
1187 "interleaved=%d-%d",
1188 interleave, interleave + 1);
1189 interleave += 2;
1190 }
1191
1192 else if (lower_transport == RTSP_LOWER_TRANSPORT_UDP_MULTICAST) {
1193 snprintf(transport, sizeof(transport) - 1,
1194 "%s/UDP;multicast", trans_pref);
1195 }
1196 if (s->oformat) {
1197 av_strlcat(transport, ";mode=receive", sizeof(transport));
1198 } else if (rt->server_type == RTSP_SERVER_REAL ||
1199 rt->server_type == RTSP_SERVER_WMS)
1200 av_strlcat(transport, ";mode=play", sizeof(transport));
1201 snprintf(cmd, sizeof(cmd),
1202 "Transport: %s\r\n",
1203 transport);
1204 if (i == 0 && rt->server_type == RTSP_SERVER_REAL) {
1205 char real_res[41], real_csum[9];
1206 ff_rdt_calc_response_and_checksum(real_res, real_csum,
1207 real_challenge);
1208 av_strlcatf(cmd, sizeof(cmd),
1209 "If-Match: %s\r\n"
1210 "RealChallenge2: %s, sd=%s\r\n",
1211 rt->session_id, real_res, real_csum);
1212 }
1213 ff_rtsp_send_cmd(s, "SETUP", rtsp_st->control_url, cmd, reply, NULL);
1214 if (reply->status_code == 461 /* Unsupported protocol */ && i == 0) {
1215 err = 1;
1216 goto fail;
1217 } else if (reply->status_code != RTSP_STATUS_OK ||
1218 reply->nb_transports != 1) {
1219 err = AVERROR_INVALIDDATA;
1220 goto fail;
1221 }
1222
1223 /* XXX: same protocol for all streams is required */
1224 if (i > 0) {
1225 if (reply->transports[0].lower_transport != rt->lower_transport ||
1226 reply->transports[0].transport != rt->transport) {
1227 err = AVERROR_INVALIDDATA;
1228 goto fail;
1229 }
1230 } else {
1231 rt->lower_transport = reply->transports[0].lower_transport;
1232 rt->transport = reply->transports[0].transport;
1233 }
1234
1235 /* close RTP connection if not choosen */
1236 if (reply->transports[0].lower_transport != RTSP_LOWER_TRANSPORT_UDP &&
1237 (lower_transport == RTSP_LOWER_TRANSPORT_UDP)) {
1238 url_close(rtsp_st->rtp_handle);
1239 rtsp_st->rtp_handle = NULL;
1240 }
1241
1242 switch(reply->transports[0].lower_transport) {
1243 case RTSP_LOWER_TRANSPORT_TCP:
1244 rtsp_st->interleaved_min = reply->transports[0].interleaved_min;
1245 rtsp_st->interleaved_max = reply->transports[0].interleaved_max;
1246 break;
1247
1248 case RTSP_LOWER_TRANSPORT_UDP: {
1249 char url[1024];
1250
1251 /* XXX: also use address if specified */
1252 ff_url_join(url, sizeof(url), "rtp", NULL, host,
1253 reply->transports[0].server_port_min, NULL);
1254 if (!(rt->server_type == RTSP_SERVER_WMS && i > 1) &&
1255 rtp_set_remote_url(rtsp_st->rtp_handle, url) < 0) {
1256 err = AVERROR_INVALIDDATA;
1257 goto fail;
1258 }
1259 /* Try to initialize the connection state in a
1260 * potential NAT router by sending dummy packets.
1261 * RTP/RTCP dummy packets are used for RDT, too.
1262 */
1263 if (!(rt->server_type == RTSP_SERVER_WMS && i > 1) && s->iformat)
1264 rtp_send_punch_packets(rtsp_st->rtp_handle);
1265 break;
1266 }
1267 case RTSP_LOWER_TRANSPORT_UDP_MULTICAST: {
1268 char url[1024];
1269 struct in_addr in;
1270 int port, ttl;
1271
1272 if (reply->transports[0].destination) {
1273 in.s_addr = htonl(reply->transports[0].destination);
1274 port = reply->transports[0].port_min;
1275 ttl = reply->transports[0].ttl;
1276 } else {
1277 in = rtsp_st->sdp_ip;
1278 port = rtsp_st->sdp_port;
1279 ttl = rtsp_st->sdp_ttl;
1280 }
1281 ff_url_join(url, sizeof(url), "rtp", NULL, inet_ntoa(in),
1282 port, "?ttl=%d", ttl);
1283 if (url_open(&rtsp_st->rtp_handle, url, URL_RDWR) < 0) {
1284 err = AVERROR_INVALIDDATA;
1285 goto fail;
1286 }
1287 break;
1288 }
1289 }
1290
1291 if ((err = rtsp_open_transport_ctx(s, rtsp_st)))
1292 goto fail;
1293 }
1294
1295 if (reply->timeout > 0)
1296 rt->timeout = reply->timeout;
1297
1298 if (rt->server_type == RTSP_SERVER_REAL)
1299 rt->need_subscription = 1;
1300
1301 return 0;
1302
1303 fail:
1304 for (i = 0; i < rt->nb_rtsp_streams; i++) {
1305 if (rt->rtsp_streams[i]->rtp_handle) {
1306 url_close(rt->rtsp_streams[i]->rtp_handle);
1307 rt->rtsp_streams[i]->rtp_handle = NULL;
1308 }
1309 }
1310 return err;
1311 }
1312
1313 static int rtsp_read_play(AVFormatContext *s)
1314 {
1315 RTSPState *rt = s->priv_data;
1316 RTSPMessageHeader reply1, *reply = &reply1;
1317 int i;
1318 char cmd[1024];
1319
1320 av_log(s, AV_LOG_DEBUG, "hello state=%d\n", rt->state);
1321
1322 if (!(rt->server_type == RTSP_SERVER_REAL && rt->need_subscription)) {
1323 if (rt->state == RTSP_STATE_PAUSED) {
1324 cmd[0] = 0;
1325 } else {
1326 snprintf(cmd, sizeof(cmd),
1327 "Range: npt=%0.3f-\r\n",
1328 (double)rt->seek_timestamp / AV_TIME_BASE);
1329 }
1330 ff_rtsp_send_cmd(s, "PLAY", rt->control_uri, cmd, reply, NULL);
1331 if (reply->status_code != RTSP_STATUS_OK) {
1332 return -1;
1333 }
1334 if (reply->range_start != AV_NOPTS_VALUE &&
1335 rt->transport == RTSP_TRANSPORT_RTP) {
1336 for (i = 0; i < rt->nb_rtsp_streams; i++) {
1337 RTSPStream *rtsp_st = rt->rtsp_streams[i];
1338 RTPDemuxContext *rtpctx = rtsp_st->transport_priv;
1339 AVStream *st = NULL;
1340 if (!rtpctx)
1341 continue;
1342 if (rtsp_st->stream_index >= 0)
1343 st = s->streams[rtsp_st->stream_index];
1344 rtpctx->last_rtcp_ntp_time = AV_NOPTS_VALUE;
1345 rtpctx->first_rtcp_ntp_time = AV_NOPTS_VALUE;
1346 if (st)
1347 rtpctx->range_start_offset = av_rescale_q(reply->range_start,
1348 AV_TIME_BASE_Q,
1349 st->time_base);
1350 }
1351 }
1352 }
1353 rt->state = RTSP_STATE_STREAMING;
1354 return 0;
1355 }
1356
1357 static int rtsp_setup_input_streams(AVFormatContext *s, RTSPMessageHeader *reply)
1358 {
1359 RTSPState *rt = s->priv_data;
1360 char cmd[1024];
1361 unsigned char *content = NULL;
1362 int ret;
1363
1364 /* describe the stream */
1365 snprintf(cmd, sizeof(cmd),
1366 "Accept: application/sdp\r\n");
1367 if (rt->server_type == RTSP_SERVER_REAL) {
1368 /**
1369 * The Require: attribute is needed for proper streaming from
1370 * Realmedia servers.
1371 */
1372 av_strlcat(cmd,
1373 "Require: com.real.retain-entity-for-setup\r\n",
1374 sizeof(cmd));
1375 }
1376 ff_rtsp_send_cmd(s, "DESCRIBE", rt->control_uri, cmd, reply, &content);
1377 if (!content)
1378 return AVERROR_INVALIDDATA;
1379 if (reply->status_code != RTSP_STATUS_OK) {
1380 av_freep(&content);
1381 return AVERROR_INVALIDDATA;
1382 }
1383
1384 /* now we got the SDP description, we parse it */
1385 ret = sdp_parse(s, (const char *)content);
1386 av_freep(&content);
1387 if (ret < 0)
1388 return AVERROR_INVALIDDATA;
1389
1390 return 0;
1391 }
1392
1393 static int rtsp_setup_output_streams(AVFormatContext *s, const char *addr)
1394 {
1395 RTSPState *rt = s->priv_data;
1396 RTSPMessageHeader reply1, *reply = &reply1;
1397 int i;
1398 char *sdp;
1399 AVFormatContext sdp_ctx, *ctx_array[1];
1400
1401 rt->start_time = av_gettime();
1402
1403 /* Announce the stream */
1404 sdp = av_mallocz(8192);
1405 if (sdp == NULL)
1406 return AVERROR(ENOMEM);
1407 /* We create the SDP based on the RTSP AVFormatContext where we
1408 * aren't allowed to change the filename field. (We create the SDP
1409 * based on the RTSP context since the contexts for the RTP streams
1410 * don't exist yet.) In order to specify a custom URL with the actual
1411 * peer IP instead of the originally specified hostname, we create
1412 * a temporary copy of the AVFormatContext, where the custom URL is set.
1413 *
1414 * FIXME: Create the SDP without copying the AVFormatContext.
1415 * This either requires setting up the RTP stream AVFormatContexts
1416 * already here (complicating things immensely) or getting a more
1417 * flexible SDP creation interface.
1418 */
1419 sdp_ctx = *s;
1420 ff_url_join(sdp_ctx.filename, sizeof(sdp_ctx.filename),
1421 "rtsp", NULL, addr, -1, NULL);
1422 ctx_array[0] = &sdp_ctx;
1423 if (avf_sdp_create(ctx_array, 1, sdp, 8192)) {
1424 av_free(sdp);
1425 return AVERROR_INVALIDDATA;
1426 }
1427 av_log(s, AV_LOG_INFO, "SDP:\n%s\n", sdp);
1428 ff_rtsp_send_cmd_with_content(s, "ANNOUNCE", rt->control_uri,
1429 "Content-Type: application/sdp\r\n",
1430 reply, NULL, sdp, strlen(sdp));
1431 av_free(sdp);
1432 if (reply->status_code != RTSP_STATUS_OK)
1433 return AVERROR_INVALIDDATA;
1434
1435 /* Set up the RTSPStreams for each AVStream */
1436 for (i = 0; i < s->nb_streams; i++) {
1437 RTSPStream *rtsp_st;
1438 AVStream *st = s->streams[i];
1439
1440 rtsp_st = av_mallocz(sizeof(RTSPStream));
1441 if (!rtsp_st)
1442 return AVERROR(ENOMEM);
1443 dynarray_add(&rt->rtsp_streams, &rt->nb_rtsp_streams, rtsp_st);
1444
1445 st->priv_data = rtsp_st;
1446 rtsp_st->stream_index = i;
1447
1448 av_strlcpy(rtsp_st->control_url, rt->control_uri, sizeof(rtsp_st->control_url));
1449 /* Note, this must match the relative uri set in the sdp content */
1450 av_strlcatf(rtsp_st->control_url, sizeof(rtsp_st->control_url),
1451 "/streamid=%d", i);
1452 }
1453
1454 return 0;
1455 }
1456
1457 void ff_rtsp_close_connections(AVFormatContext *s)
1458 {
1459 RTSPState *rt = s->priv_data;
1460 if (rt->rtsp_hd_out != rt->rtsp_hd) url_close(rt->rtsp_hd_out);
1461 url_close(rt->rtsp_hd);
1462 }
1463
1464 int ff_rtsp_connect(AVFormatContext *s)
1465 {
1466 RTSPState *rt = s->priv_data;
1467 char host[1024], path[1024], tcpname[1024], cmd[2048], auth[128];
1468 char *option_list, *option, *filename;
1469 URLContext *rtsp_hd, *rtsp_hd_out;
1470 int port, err, tcp_fd;
1471 RTSPMessageHeader reply1 = {}, *reply = &reply1;
1472 int lower_transport_mask = 0;
1473 char real_challenge[64];
1474 struct sockaddr_storage peer;
1475 socklen_t peer_len = sizeof(peer);
1476
1477 if (!ff_network_init())
1478 return AVERROR(EIO);
1479 redirect:
1480 /* extract hostname and port */
1481 ff_url_split(NULL, 0, auth, sizeof(auth),
1482 host, sizeof(host), &port, path, sizeof(path), s->filename);
1483 if (*auth) {
1484 av_strlcpy(rt->auth, auth, sizeof(rt->auth));
1485 }
1486 if (port < 0)
1487 port = RTSP_DEFAULT_PORT;
1488
1489 /* search for options */
1490 option_list = strrchr(path, '?');
1491 if (option_list) {
1492 /* Strip out the RTSP specific options, write out the rest of
1493 * the options back into the same string. */
1494 filename = option_list;
1495 while (option_list) {
1496 /* move the option pointer */
1497 option = ++option_list;
1498 option_list = strchr(option_list, '&');
1499 if (option_list)
1500 *option_list = 0;
1501
1502 /* handle the options */
1503 if (!strcmp(option, "udp")) {
1504 lower_transport_mask |= (1<< RTSP_LOWER_TRANSPORT_UDP);
1505 } else if (!strcmp(option, "multicast")) {
1506 lower_transport_mask |= (1<< RTSP_LOWER_TRANSPORT_UDP_MULTICAST);
1507 } else if (!strcmp(option, "tcp")) {
1508 lower_transport_mask |= (1<< RTSP_LOWER_TRANSPORT_TCP);
1509 } else {
1510 /* Write options back into the buffer, using memmove instead
1511 * of strcpy since the strings may overlap. */
1512 int len = strlen(option);
1513 memmove(++filename, option, len);
1514 filename += len;
1515 if (option_list) *filename = '&';
1516 }
1517 }
1518 *filename = 0;
1519 }
1520
1521 if (!lower_transport_mask)
1522 lower_transport_mask = (1 << RTSP_LOWER_TRANSPORT_NB) - 1;
1523
1524 if (s->oformat) {
1525 /* Only UDP or TCP - UDP multicast isn't supported. */
1526 lower_transport_mask &= (1 << RTSP_LOWER_TRANSPORT_UDP) |
1527 (1 << RTSP_LOWER_TRANSPORT_TCP);
1528 if (!lower_transport_mask) {
1529 av_log(s, AV_LOG_ERROR, "Unsupported lower transport method, "
1530 "only UDP and TCP are supported for output.\n");
1531 err = AVERROR(EINVAL);
1532 goto fail;
1533 }
1534 }
1535
1536 /* Construct the URI used in request; this is similar to s->filename,
1537 * but with authentication credentials removed and RTSP specific options
1538 * stripped out. */
1539 ff_url_join(rt->control_uri, sizeof(rt->control_uri), "rtsp", NULL,
1540 host, port, "%s", path);
1541
1542 /* open the tcp connexion */
1543 ff_url_join(tcpname, sizeof(tcpname), "tcp", NULL, host, port, NULL);
1544 if (url_open(&rtsp_hd, tcpname, URL_RDWR) < 0) {
1545 err = AVERROR(EIO);
1546 goto fail;
1547 }
1548 rtsp_hd_out = rtsp_hd;
1549 rt->rtsp_hd = rtsp_hd;
1550 rt->rtsp_hd_out = rtsp_hd_out;
1551 rt->seq = 0;
1552
1553 tcp_fd = url_get_file_handle(rtsp_hd);
1554 if (!getpeername(tcp_fd, (struct sockaddr*) &peer, &peer_len)) {
1555 getnameinfo((struct sockaddr*) &peer, peer_len, host, sizeof(host),
1556 NULL, 0, NI_NUMERICHOST);
1557 }
1558
1559 /* request options supported by the server; this also detects server
1560 * type */
1561 for (rt->server_type = RTSP_SERVER_RTP;;) {
1562 cmd[0] = 0;
1563 if (rt->server_type == RTSP_SERVER_REAL)
1564 av_strlcat(cmd,
1565 /**
1566 * The following entries are required for proper
1567 * streaming from a Realmedia server. They are
1568 * interdependent in some way although we currently
1569 * don't quite understand how. Values were copied
1570 * from mplayer SVN r23589.
1571 * @param CompanyID is a 16-byte ID in base64
1572 * @param ClientChallenge is a 16-byte ID in hex
1573 */
1574 "ClientChallenge: 9e26d33f2984236010ef6253fb1887f7\r\n"
1575 "PlayerStarttime: [28/03/2003:22:50:23 00:00]\r\n"
1576 "CompanyID: KnKV4M4I/B2FjJ1TToLycw==\r\n"
1577 "GUID: 00000000-0000-0000-0000-000000000000\r\n",
1578 sizeof(cmd));
1579 ff_rtsp_send_cmd(s, "OPTIONS", rt->control_uri, cmd, reply, NULL);
1580 if (reply->status_code != RTSP_STATUS_OK) {
1581 err = AVERROR_INVALIDDATA;
1582 goto fail;
1583 }
1584
1585 /* detect server type if not standard-compliant RTP */
1586 if (rt->server_type != RTSP_SERVER_REAL && reply->real_challenge[0]) {
1587 rt->server_type = RTSP_SERVER_REAL;
1588 continue;
1589 } else if (!strncasecmp(reply->server, "WMServer/", 9)) {
1590 rt->server_type = RTSP_SERVER_WMS;
1591 } else if (rt->server_type == RTSP_SERVER_REAL)
1592 strcpy(real_challenge, reply->real_challenge);
1593 break;
1594 }
1595
1596 if (s->iformat)
1597 err = rtsp_setup_input_streams(s, reply);
1598 else
1599 err = rtsp_setup_output_streams(s, host);
1600 if (err)
1601 goto fail;
1602
1603 do {
1604 int lower_transport = ff_log2_tab[lower_transport_mask &
1605 ~(lower_transport_mask - 1)];
1606
1607 err = make_setup_request(s, host, port, lower_transport,
1608 rt->server_type == RTSP_SERVER_REAL ?
1609 real_challenge : NULL);
1610 if (err < 0)
1611 goto fail;
1612 lower_transport_mask &= ~(1 << lower_transport);
1613 if (lower_transport_mask == 0 && err == 1) {
1614 err = FF_NETERROR(EPROTONOSUPPORT);
1615 goto fail;
1616 }
1617 } while (err);
1618
1619 rt->state = RTSP_STATE_IDLE;
1620 rt->seek_timestamp = 0; /* default is to start stream at position zero */
1621 return 0;
1622 fail:
1623 ff_rtsp_close_streams(s);
1624 ff_rtsp_close_connections(s);
1625 if (reply->status_code >=300 && reply->status_code < 400 && s->iformat) {
1626 av_strlcpy(s->filename, reply->location, sizeof(s->filename));
1627 av_log(s, AV_LOG_INFO, "Status %d: Redirecting to %s\n",
1628 reply->status_code,
1629 s->filename);
1630 goto redirect;
1631 }
1632 ff_network_close();
1633 return err;
1634 }
1635 #endif
1636
1637 #if CONFIG_RTSP_DEMUXER
1638 static int rtsp_read_header(AVFormatContext *s,
1639 AVFormatParameters *ap)
1640 {
1641 RTSPState *rt = s->priv_data;
1642 int ret;
1643
1644 ret = ff_rtsp_connect(s);
1645 if (ret)
1646 return ret;
1647
1648 if (ap->initial_pause) {
1649 /* do not start immediately */
1650 } else {
1651 if (rtsp_read_play(s) < 0) {
1652 ff_rtsp_close_streams(s);
1653 ff_rtsp_close_connections(s);
1654 return AVERROR_INVALIDDATA;
1655 }
1656 }
1657
1658 return 0;
1659 }
1660
1661 static int udp_read_packet(AVFormatContext *s, RTSPStream **prtsp_st,
1662 uint8_t *buf, int buf_size)
1663 {
1664 RTSPState *rt = s->priv_data;
1665 RTSPStream *rtsp_st;
1666 fd_set rfds;
1667 int fd, fd_max, n, i, ret, tcp_fd, timeout_cnt = 0;
1668 struct timeval tv;
1669
1670 for (;;) {
1671 if (url_interrupt_cb())
1672 return AVERROR(EINTR);
1673 FD_ZERO(&rfds);
1674 if (rt->rtsp_hd) {
1675 tcp_fd = fd_max = url_get_file_handle(rt->rtsp_hd);
1676 FD_SET(tcp_fd, &rfds);
1677 } else {
1678 fd_max = 0;
1679 tcp_fd = -1;
1680 }
1681 for (i = 0; i < rt->nb_rtsp_streams; i++) {
1682 rtsp_st = rt->rtsp_streams[i];
1683 if (rtsp_st->rtp_handle) {
1684 /* currently, we cannot probe RTCP handle because of
1685 * blocking restrictions */
1686 fd = url_get_file_handle(rtsp_st->rtp_handle);
1687 if (fd > fd_max)
1688 fd_max = fd;
1689 FD_SET(fd, &rfds);
1690 }
1691 }
1692 tv.tv_sec = 0;
1693 tv.tv_usec = SELECT_TIMEOUT_MS * 1000;
1694 n = select(fd_max + 1, &rfds, NULL, NULL, &tv);
1695 if (n > 0) {
1696 timeout_cnt = 0;
1697 for (i = 0; i < rt->nb_rtsp_streams; i++) {
1698 rtsp_st = rt->rtsp_streams[i];
1699 if (rtsp_st->rtp_handle) {
1700 fd = url_get_file_handle(rtsp_st->rtp_handle);
1701 if (FD_ISSET(fd, &rfds)) {
1702 ret = url_read(rtsp_st->rtp_handle, buf, buf_size);
1703 if (ret > 0) {
1704 *prtsp_st = rtsp_st;
1705 return ret;
1706 }
1707 }
1708 }
1709 }
1710 #if CONFIG_RTSP_DEMUXER
1711 if (tcp_fd != -1 && FD_ISSET(tcp_fd, &rfds)) {
1712 RTSPMessageHeader reply;
1713
1714 ret = ff_rtsp_read_reply(s, &reply, NULL, 0);
1715 if (ret < 0)
1716 return ret;
1717 /* XXX: parse message */
1718 if (rt->state != RTSP_STATE_STREAMING)
1719 return 0;
1720 }
1721 #endif
1722 } else if (n == 0 && ++timeout_cnt >= MAX_TIMEOUTS) {
1723 return FF_NETERROR(ETIMEDOUT);
1724 } else if (n < 0 && errno != EINTR)
1725 return AVERROR(errno);
1726 }
1727 }
1728
1729 static int tcp_read_packet(AVFormatContext *s, RTSPStream **prtsp_st,
1730 uint8_t *buf, int buf_size)
1731 {
1732 RTSPState *rt = s->priv_data;
1733 int id, len, i, ret;
1734 RTSPStream *rtsp_st;
1735
1736 #ifdef DEBUG_RTP_TCP
1737 dprintf(s, "tcp_read_packet:\n");
1738 #endif
1739 redo:
1740 for (;;) {
1741 RTSPMessageHeader reply;
1742
1743 ret = ff_rtsp_read_reply(s, &reply, NULL, 1);
1744 if (ret == -1)
1745 return -1;
1746 if (ret == 1) /* received '$' */
1747 break;
1748 /* XXX: parse message */
1749 if (rt->state != RTSP_STATE_STREAMING)
1750 return 0;
1751 }
1752 ret = url_read_complete(rt->rtsp_hd, buf, 3);
1753 if (ret != 3)
1754 return -1;
1755 id = buf[0];
1756 len = AV_RB16(buf + 1);
1757 #ifdef DEBUG_RTP_TCP
1758 dprintf(s, "id=%d len=%d\n", id, len);
1759 #endif
1760 if (len > buf_size || len < 12)
1761 goto redo;
1762 /* get the data */
1763 ret = url_read_complete(rt->rtsp_hd, buf, len);
1764 if (ret != len)
1765 return -1;
1766 if (rt->transport == RTSP_TRANSPORT_RDT &&
1767 ff_rdt_parse_header(buf, len, &id, NULL, NULL, NULL, NULL) < 0)
1768 return -1;
1769
1770 /* find the matching stream */
1771 for (i = 0; i < rt->nb_rtsp_streams; i++) {
1772 rtsp_st = rt->rtsp_streams[i];
1773 if (id >= rtsp_st->interleaved_min &&
1774 id <= rtsp_st->interleaved_max)
1775 goto found;
1776 }
1777 goto redo;
1778 found:
1779 *prtsp_st = rtsp_st;
1780 return len;
1781 }
1782
1783 static int rtsp_fetch_packet(AVFormatContext *s, AVPacket *pkt)
1784 {
1785 RTSPState *rt = s->priv_data;
1786 int ret, len;
1787 uint8_t buf[10 * RTP_MAX_PACKET_LENGTH];
1788 RTSPStream *rtsp_st;
1789
1790 /* get next frames from the same RTP packet */
1791 if (rt->cur_transport_priv) {
1792 if (rt->transport == RTSP_TRANSPORT_RDT) {
1793 ret = ff_rdt_parse_packet(rt->cur_transport_priv, pkt, NULL, 0);
1794 } else
1795 ret = rtp_parse_packet(rt->cur_transport_priv, pkt, NULL, 0);
1796 if (ret == 0) {
1797 rt->cur_transport_priv = NULL;
1798 return 0;
1799 } else if (ret == 1) {
1800 return 0;
1801 } else
1802 rt->cur_transport_priv = NULL;
1803 }
1804
1805 /* read next RTP packet */
1806 redo:
1807 switch(rt->lower_transport) {
1808 default:
1809 #if CONFIG_RTSP_DEMUXER
1810 case RTSP_LOWER_TRANSPORT_TCP:
1811 len = tcp_read_packet(s, &rtsp_st, buf, sizeof(buf));
1812 break;
1813 #endif
1814 case RTSP_LOWER_TRANSPORT_UDP:
1815 case RTSP_LOWER_TRANSPORT_UDP_MULTICAST:
1816 len = udp_read_packet(s, &rtsp_st, buf, sizeof(buf));
1817 if (len >=0 && rtsp_st->transport_priv && rt->transport == RTSP_TRANSPORT_RTP)
1818 rtp_check_and_send_back_rr(rtsp_st->transport_priv, len);
1819 break;
1820 }
1821 if (len < 0)
1822 return len;
1823 if (len == 0)
1824 return AVERROR_EOF;
1825 if (rt->transport == RTSP_TRANSPORT_RDT) {
1826 ret = ff_rdt_parse_packet(rtsp_st->transport_priv, pkt, buf, len);
1827 } else {
1828 ret = rtp_parse_packet(rtsp_st->transport_priv, pkt, buf, len);
1829 if (ret < 0) {
1830 /* Either bad packet, or a RTCP packet. Check if the
1831 * first_rtcp_ntp_time field was initialized. */
1832 RTPDemuxContext *rtpctx = rtsp_st->transport_priv;
1833 if (rtpctx->first_rtcp_ntp_time != AV_NOPTS_VALUE) {
1834 /* first_rtcp_ntp_time has been initialized for this stream,
1835 * copy the same value to all other uninitialized streams,
1836 * in order to map their timestamp origin to the same ntp time
1837 * as this one. */
1838 int i;
1839 for (i = 0; i < rt->nb_rtsp_streams; i++) {
1840 RTPDemuxContext *rtpctx2 = rtsp_st->transport_priv;
1841 if (rtpctx2 &&
1842 rtpctx2->first_rtcp_ntp_time == AV_NOPTS_VALUE)
1843 rtpctx2->first_rtcp_ntp_time = rtpctx->first_rtcp_ntp_time;
1844 }
1845 }
1846 }
1847 }
1848 if (ret < 0)
1849 goto redo;
1850 if (ret == 1)
1851 /* more packets may follow, so we save the RTP context */
1852 rt->cur_transport_priv = rtsp_st->transport_priv;
1853
1854 return ret;
1855 }
1856
1857 static int rtsp_read_packet(AVFormatContext *s, AVPacket *pkt)
1858 {
1859 RTSPState *rt = s->priv_data;
1860 int ret;
1861 RTSPMessageHeader reply1, *reply = &reply1;
1862 char cmd[1024];
1863
1864 if (rt->server_type == RTSP_SERVER_REAL) {
1865 int i;
1866 enum AVDiscard cache[MAX_STREAMS];
1867
1868 for (i = 0; i < s->nb_streams; i++)
1869 cache[i] = s->streams[i]->discard;
1870
1871 if (!rt->need_subscription) {
1872 if (memcmp (cache, rt->real_setup_cache,
1873 sizeof(enum AVDiscard) * s->nb_streams)) {
1874 snprintf(cmd, sizeof(cmd),
1875 "Unsubscribe: %s\r\n",
1876 rt->last_subscription);
1877 ff_rtsp_send_cmd(s, "SET_PARAMETER", rt->control_uri,
1878 cmd, reply, NULL);
1879 if (reply->status_code != RTSP_STATUS_OK)
1880 return AVERROR_INVALIDDATA;
1881 rt->need_subscription = 1;
1882 }
1883 }
1884
1885 if (rt->need_subscription) {
1886 int r, rule_nr, first = 1;
1887
1888 memcpy(rt->real_setup_cache, cache,
1889 sizeof(enum AVDiscard) * s->nb_streams);
1890 rt->last_subscription[0] = 0;
1891
1892 snprintf(cmd, sizeof(cmd),
1893 "Subscribe: ");
1894 for (i = 0; i < rt->nb_rtsp_streams; i++) {
1895 rule_nr = 0;
1896 for (r = 0; r < s->nb_streams; r++) {
1897 if (s->streams[r]->priv_data == rt->rtsp_streams[i]) {
1898 if (s->streams[r]->discard != AVDISCARD_ALL) {
1899 if (!first)
1900 av_strlcat(rt->last_subscription, ",",
1901 sizeof(rt->last_subscription));
1902 ff_rdt_subscribe_rule(
1903 rt->last_subscription,
1904 sizeof(rt->last_subscription), i, rule_nr);
1905 first = 0;
1906 }
1907 rule_nr++;
1908 }
1909 }
1910 }
1911 av_strlcatf(cmd, sizeof(cmd), "%s\r\n", rt->last_subscription);
1912 ff_rtsp_send_cmd(s, "SET_PARAMETER", rt->control_uri,
1913 cmd, reply, NULL);
1914 if (reply->status_code != RTSP_STATUS_OK)
1915 return AVERROR_INVALIDDATA;
1916 rt->need_subscription = 0;
1917
1918 if (rt->state == RTSP_STATE_STREAMING)
1919 rtsp_read_play (s);
1920 }
1921 }
1922
1923 ret = rtsp_fetch_packet(s, pkt);
1924 if (ret < 0)
1925 return ret;
1926
1927 /* send dummy request to keep TCP connection alive */
1928 if ((rt->server_type == RTSP_SERVER_WMS ||
1929 rt->server_type == RTSP_SERVER_REAL) &&
1930 (av_gettime() - rt->last_cmd_time) / 1000000 >= rt->timeout / 2) {
1931 if (rt->server_type == RTSP_SERVER_WMS) {
1932 ff_rtsp_send_cmd_async(s, "GET_PARAMETER", rt->control_uri, NULL);
1933 } else {
1934 ff_rtsp_send_cmd_async(s, "OPTIONS", "*", NULL);
1935 }
1936 }
1937
1938 return 0;
1939 }
1940
1941 /* pause the stream */
1942 static int rtsp_read_pause(AVFormatContext *s)
1943 {
1944 RTSPState *rt = s->priv_data;
1945 RTSPMessageHeader reply1, *reply = &reply1;
1946
1947 if (rt->state != RTSP_STATE_STREAMING)
1948 return 0;
1949 else if (!(rt->server_type == RTSP_SERVER_REAL && rt->need_subscription)) {
1950 ff_rtsp_send_cmd(s, "PAUSE", rt->control_uri, NULL, reply, NULL);
1951 if (reply->status_code != RTSP_STATUS_OK) {
1952 return -1;
1953 }
1954 }
1955 rt->state = RTSP_STATE_PAUSED;
1956 return 0;
1957 }
1958
1959 static int rtsp_read_seek(AVFormatContext *s, int stream_index,
1960 int64_t timestamp, int flags)
1961 {
1962 RTSPState *rt = s->priv_data;
1963
1964 rt->seek_timestamp = av_rescale_q(timestamp,
1965 s->streams[stream_index]->time_base,
1966 AV_TIME_BASE_Q);
1967 switch(rt->state) {
1968 default:
1969 case RTSP_STATE_IDLE:
1970 break;
1971 case RTSP_STATE_STREAMING:
1972 if (rtsp_read_pause(s) != 0)
1973 return -1;
1974 rt->state = RTSP_STATE_SEEKING;
1975 if (rtsp_read_play(s) != 0)
1976 return -1;
1977 break;
1978 case RTSP_STATE_PAUSED:
1979 rt->state = RTSP_STATE_IDLE;
1980 break;
1981 }
1982 return 0;
1983 }
1984
1985 static int rtsp_read_close(AVFormatContext *s)
1986 {
1987 RTSPState *rt = s->priv_data;
1988
1989 #if 0
1990 /* NOTE: it is valid to flush the buffer here */
1991 if (rt->lower_transport == RTSP_LOWER_TRANSPORT_TCP) {
1992 url_fclose(&rt->rtsp_gb);
1993 }
1994 #endif
1995 ff_rtsp_send_cmd_async(s, "TEARDOWN", rt->control_uri, NULL);
1996
1997 ff_rtsp_close_streams(s);
1998 ff_rtsp_close_connections(s);
1999 ff_network_close();
2000 return 0;
2001 }
2002
2003 AVInputFormat rtsp_demuxer = {
2004 "rtsp",
2005 NULL_IF_CONFIG_SMALL("RTSP input format"),
2006 sizeof(RTSPState),
2007 rtsp_probe,
2008 rtsp_read_header,
2009 rtsp_read_packet,
2010 rtsp_read_close,
2011 rtsp_read_seek,
2012 .flags = AVFMT_NOFILE,
2013 .read_play = rtsp_read_play,
2014 .read_pause = rtsp_read_pause,
2015 };
2016 #endif
2017
2018 static int sdp_probe(AVProbeData *p1)
2019 {
2020 const char *p = p1->buf, *p_end = p1->buf + p1->buf_size;
2021
2022 /* we look for a line beginning "c=IN IP4" */
2023 while (p < p_end && *p != '\0') {
2024 if (p + sizeof("c=IN IP4") - 1 < p_end &&
2025 av_strstart(p, "c=IN IP4", NULL))
2026 return AVPROBE_SCORE_MAX / 2;
2027
2028 while (p < p_end - 1 && *p != '\n') p++;
2029 if (++p >= p_end)
2030 break;
2031 if (*p == '\r')
2032 p++;
2033 }
2034 return 0;
2035 }
2036
2037 #define SDP_MAX_SIZE 8192
2038
2039 static int sdp_read_header(AVFormatContext *s, AVFormatParameters *ap)
2040 {
2041 RTSPState *rt = s->priv_data;
2042 RTSPStream *rtsp_st;
2043 int size, i, err;
2044 char *content;
2045 char url[1024];
2046
2047 if (!ff_network_init())
2048 return AVERROR(EIO);
2049
2050 /* read the whole sdp file */
2051 /* XXX: better loading */
2052 content = av_malloc(SDP_MAX_SIZE);
2053 size = get_buffer(s->pb, content, SDP_MAX_SIZE - 1);
2054 if (size <= 0) {
2055 av_free(content);
2056 return AVERROR_INVALIDDATA;
2057 }
2058 content[size] ='\0';
2059
2060 sdp_parse(s, content);
2061 av_free(content);
2062
2063 /* open each RTP stream */
2064 for (i = 0; i < rt->nb_rtsp_streams; i++) {
2065 rtsp_st = rt->rtsp_streams[i];
2066
2067 ff_url_join(url, sizeof(url), "rtp", NULL,
2068 inet_ntoa(rtsp_st->sdp_ip), rtsp_st->sdp_port,
2069 "?localport=%d&ttl=%d", rtsp_st->sdp_port,
2070 rtsp_st->sdp_ttl);
2071 if (url_open(&rtsp_st->rtp_handle, url, URL_RDWR) < 0) {
2072 err = AVERROR_INVALIDDATA;
2073 goto fail;
2074 }
2075 if ((err = rtsp_open_transport_ctx(s, rtsp_st)))
2076 goto fail;
2077 }
2078 return 0;
2079 fail:
2080 ff_rtsp_close_streams(s);
2081 ff_network_close();
2082 return err;
2083 }
2084
2085 static int sdp_read_close(AVFormatContext *s)
2086 {
2087 ff_rtsp_close_streams(s);
2088 ff_network_close();
2089 return 0;
2090 }
2091
2092 AVInputFormat sdp_demuxer = {
2093 "sdp",
2094 NULL_IF_CONFIG_SMALL("SDP"),
2095 sizeof(RTSPState),
2096 sdp_probe,
2097 sdp_read_header,
2098 rtsp_fetch_packet,
2099 sdp_read_close,
2100 };