8550bf2912c19068b18ce4b2623189c59260f501
[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 "network.h"
33 #include "rtsp.h"
34
35 #include "rtpdec.h"
36 #include "rdt.h"
37 #include "rtpdec_asf.h"
38 #include "rtpdec_vorbis.h"
39
40 //#define DEBUG
41 //#define DEBUG_RTP_TCP
42
43 #if LIBAVFORMAT_VERSION_INT < (53 << 16)
44 int rtsp_default_protocols = (1 << RTSP_LOWER_TRANSPORT_UDP);
45 #endif
46
47 #define SPACE_CHARS " \t\r\n"
48 /* we use memchr() instead of strchr() here because strchr() will return
49 * the terminating '\0' of SPACE_CHARS instead of NULL if c is '\0'. */
50 #define redir_isspace(c) memchr(SPACE_CHARS, c, 4)
51 static void skip_spaces(const char **pp)
52 {
53 const char *p;
54 p = *pp;
55 while (redir_isspace(*p))
56 p++;
57 *pp = p;
58 }
59
60 static void get_word_until_chars(char *buf, int buf_size,
61 const char *sep, const char **pp)
62 {
63 const char *p;
64 char *q;
65
66 p = *pp;
67 skip_spaces(&p);
68 q = buf;
69 while (!strchr(sep, *p) && *p != '\0') {
70 if ((q - buf) < buf_size - 1)
71 *q++ = *p;
72 p++;
73 }
74 if (buf_size > 0)
75 *q = '\0';
76 *pp = p;
77 }
78
79 static void get_word_sep(char *buf, int buf_size, const char *sep,
80 const char **pp)
81 {
82 if (**pp == '/') (*pp)++;
83 get_word_until_chars(buf, buf_size, sep, pp);
84 }
85
86 static void get_word(char *buf, int buf_size, const char **pp)
87 {
88 get_word_until_chars(buf, buf_size, SPACE_CHARS, pp);
89 }
90
91 /* parse the rtpmap description: <codec_name>/<clock_rate>[/<other params>] */
92 static int sdp_parse_rtpmap(AVFormatContext *s,
93 AVCodecContext *codec, RTSPStream *rtsp_st,
94 int payload_type, const char *p)
95 {
96 char buf[256];
97 int i;
98 AVCodec *c;
99 const char *c_name;
100
101 /* Loop into AVRtpDynamicPayloadTypes[] and AVRtpPayloadTypes[] and
102 * see if we can handle this kind of payload.
103 * The space should normally not be there but some Real streams or
104 * particular servers ("RealServer Version 6.1.3.970", see issue 1658)
105 * have a trailing space. */
106 get_word_sep(buf, sizeof(buf), "/ ", &p);
107 if (payload_type >= RTP_PT_PRIVATE) {
108 RTPDynamicProtocolHandler *handler;
109 for (handler = RTPFirstDynamicPayloadHandler;
110 handler; handler = handler->next) {
111 if (!strcasecmp(buf, handler->enc_name) &&
112 codec->codec_type == handler->codec_type) {
113 codec->codec_id = handler->codec_id;
114 rtsp_st->dynamic_handler = handler;
115 if (handler->open)
116 rtsp_st->dynamic_protocol_context = handler->open();
117 break;
118 }
119 }
120 } else {
121 /* We are in a standard case
122 * (from http://www.iana.org/assignments/rtp-parameters). */
123 /* search into AVRtpPayloadTypes[] */
124 codec->codec_id = ff_rtp_codec_id(buf, codec->codec_type);
125 }
126
127 c = avcodec_find_decoder(codec->codec_id);
128 if (c && c->name)
129 c_name = c->name;
130 else
131 c_name = "(null)";
132
133 get_word_sep(buf, sizeof(buf), "/", &p);
134 i = atoi(buf);
135 switch (codec->codec_type) {
136 case CODEC_TYPE_AUDIO:
137 av_log(s, AV_LOG_DEBUG, "audio codec set to: %s\n", c_name);
138 codec->sample_rate = RTSP_DEFAULT_AUDIO_SAMPLERATE;
139 codec->channels = RTSP_DEFAULT_NB_AUDIO_CHANNELS;
140 if (i > 0) {
141 codec->sample_rate = i;
142 get_word_sep(buf, sizeof(buf), "/", &p);
143 i = atoi(buf);
144 if (i > 0)
145 codec->channels = i;
146 // TODO: there is a bug here; if it is a mono stream, and
147 // less than 22000Hz, faad upconverts to stereo and twice
148 // the frequency. No problem, but the sample rate is being
149 // set here by the sdp line. Patch on its way. (rdm)
150 }
151 av_log(s, AV_LOG_DEBUG, "audio samplerate set to: %i\n",
152 codec->sample_rate);
153 av_log(s, AV_LOG_DEBUG, "audio channels set to: %i\n",
154 codec->channels);
155 break;
156 case CODEC_TYPE_VIDEO:
157 av_log(s, AV_LOG_DEBUG, "video codec set to: %s\n", c_name);
158 break;
159 default:
160 break;
161 }
162 return 0;
163 }
164
165 /* return the length and optionally the data */
166 static int hex_to_data(uint8_t *data, const char *p)
167 {
168 int c, len, v;
169
170 len = 0;
171 v = 1;
172 for (;;) {
173 skip_spaces(&p);
174 if (*p == '\0')
175 break;
176 c = toupper((unsigned char) *p++);
177 if (c >= '0' && c <= '9')
178 c = c - '0';
179 else if (c >= 'A' && c <= 'F')
180 c = c - 'A' + 10;
181 else
182 break;
183 v = (v << 4) | c;
184 if (v & 0x100) {
185 if (data)
186 data[len] = v;
187 len++;
188 v = 1;
189 }
190 }
191 return len;
192 }
193
194 static void sdp_parse_fmtp_config(AVCodecContext * codec, void *ctx,
195 char *attr, char *value)
196 {
197 switch (codec->codec_id) {
198 case CODEC_ID_MPEG4:
199 case CODEC_ID_AAC:
200 if (!strcmp(attr, "config")) {
201 /* decode the hexa encoded parameter */
202 int len = hex_to_data(NULL, value);
203 if (codec->extradata)
204 av_free(codec->extradata);
205 codec->extradata = av_mallocz(len + FF_INPUT_BUFFER_PADDING_SIZE);
206 if (!codec->extradata)
207 return;
208 codec->extradata_size = len;
209 hex_to_data(codec->extradata, value);
210 }
211 break;
212 case CODEC_ID_VORBIS:
213 ff_vorbis_parse_fmtp_config(codec, ctx, attr, value);
214 break;
215 default:
216 break;
217 }
218 return;
219 }
220
221 typedef struct {
222 const char *str;
223 uint16_t type;
224 uint32_t offset;
225 } AttrNameMap;
226
227 /* All known fmtp parmeters and the corresping RTPAttrTypeEnum */
228 #define ATTR_NAME_TYPE_INT 0
229 #define ATTR_NAME_TYPE_STR 1
230 static const AttrNameMap attr_names[]=
231 {
232 { "SizeLength", ATTR_NAME_TYPE_INT,
233 offsetof(RTPPayloadData, sizelength) },
234 { "IndexLength", ATTR_NAME_TYPE_INT,
235 offsetof(RTPPayloadData, indexlength) },
236 { "IndexDeltaLength", ATTR_NAME_TYPE_INT,
237 offsetof(RTPPayloadData, indexdeltalength) },
238 { "profile-level-id", ATTR_NAME_TYPE_INT,
239 offsetof(RTPPayloadData, profile_level_id) },
240 { "StreamType", ATTR_NAME_TYPE_INT,
241 offsetof(RTPPayloadData, streamtype) },
242 { "mode", ATTR_NAME_TYPE_STR,
243 offsetof(RTPPayloadData, mode) },
244 { NULL, -1, -1 },
245 };
246
247 /* parse the attribute line from the fmtp a line of an sdp resonse. This
248 * is broken out as a function because it is used in rtp_h264.c, which is
249 * forthcoming. */
250 int ff_rtsp_next_attr_and_value(const char **p, char *attr, int attr_size,
251 char *value, int value_size)
252 {
253 skip_spaces(p);
254 if (**p) {
255 get_word_sep(attr, attr_size, "=", p);
256 if (**p == '=')
257 (*p)++;
258 get_word_sep(value, value_size, ";", p);
259 if (**p == ';')
260 (*p)++;
261 return 1;
262 }
263 return 0;
264 }
265
266 /* parse a SDP line and save stream attributes */
267 static void sdp_parse_fmtp(AVStream *st, const char *p)
268 {
269 char attr[256];
270 /* Vorbis setup headers can be up to 12KB and are sent base64
271 * encoded, giving a 12KB * (4/3) = 16KB FMTP line. */
272 char value[16384];
273 int i;
274 RTSPStream *rtsp_st = st->priv_data;
275 AVCodecContext *codec = st->codec;
276 RTPPayloadData *rtp_payload_data = &rtsp_st->rtp_payload_data;
277
278 /* loop on each attribute */
279 while (ff_rtsp_next_attr_and_value(&p, attr, sizeof(attr),
280 value, sizeof(value))) {
281 /* grab the codec extra_data from the config parameter of the fmtp
282 * line */
283 sdp_parse_fmtp_config(codec, rtsp_st->dynamic_protocol_context,
284 attr, value);
285 /* Looking for a known attribute */
286 for (i = 0; attr_names[i].str; ++i) {
287 if (!strcasecmp(attr, attr_names[i].str)) {
288 if (attr_names[i].type == ATTR_NAME_TYPE_INT) {
289 *(int *)((char *)rtp_payload_data +
290 attr_names[i].offset) = atoi(value);
291 } else if (attr_names[i].type == ATTR_NAME_TYPE_STR)
292 *(char **)((char *)rtp_payload_data +
293 attr_names[i].offset) = av_strdup(value);
294 }
295 }
296 }
297 }
298
299 /** Parse a string p in the form of Range:npt=xx-xx, and determine the start
300 * and end time.
301 * Used for seeking in the rtp stream.
302 */
303 static void rtsp_parse_range_npt(const char *p, int64_t *start, int64_t *end)
304 {
305 char buf[256];
306
307 skip_spaces(&p);
308 if (!av_stristart(p, "npt=", &p))
309 return;
310
311 *start = AV_NOPTS_VALUE;
312 *end = AV_NOPTS_VALUE;
313
314 get_word_sep(buf, sizeof(buf), "-", &p);
315 *start = parse_date(buf, 1);
316 if (*p == '-') {
317 p++;
318 get_word_sep(buf, sizeof(buf), "-", &p);
319 *end = parse_date(buf, 1);
320 }
321 // av_log(NULL, AV_LOG_DEBUG, "Range Start: %lld\n", *start);
322 // av_log(NULL, AV_LOG_DEBUG, "Range End: %lld\n", *end);
323 }
324
325 typedef struct SDPParseState {
326 /* SDP only */
327 struct in_addr default_ip;
328 int default_ttl;
329 int skip_media; ///< set if an unknown m= line occurs
330 } SDPParseState;
331
332 static void sdp_parse_line(AVFormatContext *s, SDPParseState *s1,
333 int letter, const char *buf)
334 {
335 RTSPState *rt = s->priv_data;
336 char buf1[64], st_type[64];
337 const char *p;
338 enum CodecType codec_type;
339 int payload_type, i;
340 AVStream *st;
341 RTSPStream *rtsp_st;
342 struct in_addr sdp_ip;
343 int ttl;
344
345 dprintf(s, "sdp: %c='%s'\n", letter, buf);
346
347 p = buf;
348 if (s1->skip_media && letter != 'm')
349 return;
350 switch (letter) {
351 case 'c':
352 get_word(buf1, sizeof(buf1), &p);
353 if (strcmp(buf1, "IN") != 0)
354 return;
355 get_word(buf1, sizeof(buf1), &p);
356 if (strcmp(buf1, "IP4") != 0)
357 return;
358 get_word_sep(buf1, sizeof(buf1), "/", &p);
359 if (ff_inet_aton(buf1, &sdp_ip) == 0)
360 return;
361 ttl = 16;
362 if (*p == '/') {
363 p++;
364 get_word_sep(buf1, sizeof(buf1), "/", &p);
365 ttl = atoi(buf1);
366 }
367 if (s->nb_streams == 0) {
368 s1->default_ip = sdp_ip;
369 s1->default_ttl = ttl;
370 } else {
371 st = s->streams[s->nb_streams - 1];
372 rtsp_st = st->priv_data;
373 rtsp_st->sdp_ip = sdp_ip;
374 rtsp_st->sdp_ttl = ttl;
375 }
376 break;
377 case 's':
378 av_metadata_set(&s->metadata, "title", p);
379 break;
380 case 'i':
381 if (s->nb_streams == 0) {
382 av_metadata_set(&s->metadata, "comment", p);
383 break;
384 }
385 break;
386 case 'm':
387 /* new stream */
388 s1->skip_media = 0;
389 get_word(st_type, sizeof(st_type), &p);
390 if (!strcmp(st_type, "audio")) {
391 codec_type = CODEC_TYPE_AUDIO;
392 } else if (!strcmp(st_type, "video")) {
393 codec_type = CODEC_TYPE_VIDEO;
394 } else if (!strcmp(st_type, "application")) {
395 codec_type = CODEC_TYPE_DATA;
396 } else {
397 s1->skip_media = 1;
398 return;
399 }
400 rtsp_st = av_mallocz(sizeof(RTSPStream));
401 if (!rtsp_st)
402 return;
403 rtsp_st->stream_index = -1;
404 dynarray_add(&rt->rtsp_streams, &rt->nb_rtsp_streams, rtsp_st);
405
406 rtsp_st->sdp_ip = s1->default_ip;
407 rtsp_st->sdp_ttl = s1->default_ttl;
408
409 get_word(buf1, sizeof(buf1), &p); /* port */
410 rtsp_st->sdp_port = atoi(buf1);
411
412 get_word(buf1, sizeof(buf1), &p); /* protocol (ignored) */
413
414 /* XXX: handle list of formats */
415 get_word(buf1, sizeof(buf1), &p); /* format list */
416 rtsp_st->sdp_payload_type = atoi(buf1);
417
418 if (!strcmp(ff_rtp_enc_name(rtsp_st->sdp_payload_type), "MP2T")) {
419 /* no corresponding stream */
420 } else {
421 st = av_new_stream(s, 0);
422 if (!st)
423 return;
424 st->priv_data = rtsp_st;
425 rtsp_st->stream_index = st->index;
426 st->codec->codec_type = codec_type;
427 if (rtsp_st->sdp_payload_type < RTP_PT_PRIVATE) {
428 /* if standard payload type, we can find the codec right now */
429 ff_rtp_get_codec_info(st->codec, rtsp_st->sdp_payload_type);
430 }
431 }
432 /* put a default control url */
433 av_strlcpy(rtsp_st->control_url, rt->control_uri,
434 sizeof(rtsp_st->control_url));
435 break;
436 case 'a':
437 if (av_strstart(p, "control:", &p)) {
438 if (s->nb_streams == 0) {
439 if (!strncmp(p, "rtsp://", 7))
440 av_strlcpy(rt->control_uri, p,
441 sizeof(rt->control_uri));
442 } else {
443 char proto[32];
444 /* get the control url */
445 st = s->streams[s->nb_streams - 1];
446 rtsp_st = st->priv_data;
447
448 /* XXX: may need to add full url resolution */
449 ff_url_split(proto, sizeof(proto), NULL, 0, NULL, 0,
450 NULL, NULL, 0, p);
451 if (proto[0] == '\0') {
452 /* relative control URL */
453 if (rtsp_st->control_url[strlen(rtsp_st->control_url)-1]!='/')
454 av_strlcat(rtsp_st->control_url, "/",
455 sizeof(rtsp_st->control_url));
456 av_strlcat(rtsp_st->control_url, p,
457 sizeof(rtsp_st->control_url));
458 } else
459 av_strlcpy(rtsp_st->control_url, p,
460 sizeof(rtsp_st->control_url));
461 }
462 } else if (av_strstart(p, "rtpmap:", &p) && s->nb_streams > 0) {
463 /* NOTE: rtpmap is only supported AFTER the 'm=' tag */
464 get_word(buf1, sizeof(buf1), &p);
465 payload_type = atoi(buf1);
466 st = s->streams[s->nb_streams - 1];
467 rtsp_st = st->priv_data;
468 sdp_parse_rtpmap(s, st->codec, rtsp_st, payload_type, p);
469 } else if (av_strstart(p, "fmtp:", &p)) {
470 /* NOTE: fmtp is only supported AFTER the 'a=rtpmap:xxx' tag */
471 get_word(buf1, sizeof(buf1), &p);
472 payload_type = atoi(buf1);
473 for (i = 0; i < s->nb_streams; i++) {
474 st = s->streams[i];
475 rtsp_st = st->priv_data;
476 if (rtsp_st->sdp_payload_type == payload_type) {
477 if (!(rtsp_st->dynamic_handler &&
478 rtsp_st->dynamic_handler->parse_sdp_a_line &&
479 rtsp_st->dynamic_handler->parse_sdp_a_line(s,
480 i, rtsp_st->dynamic_protocol_context, buf)))
481 sdp_parse_fmtp(st, p);
482 }
483 }
484 } else if (av_strstart(p, "framesize:", &p)) {
485 // let dynamic protocol handlers have a stab at the line.
486 get_word(buf1, sizeof(buf1), &p);
487 payload_type = atoi(buf1);
488 for (i = 0; i < s->nb_streams; i++) {
489 st = s->streams[i];
490 rtsp_st = st->priv_data;
491 if (rtsp_st->sdp_payload_type == payload_type &&
492 rtsp_st->dynamic_handler &&
493 rtsp_st->dynamic_handler->parse_sdp_a_line)
494 rtsp_st->dynamic_handler->parse_sdp_a_line(s, i,
495 rtsp_st->dynamic_protocol_context, buf);
496 }
497 } else if (av_strstart(p, "range:", &p)) {
498 int64_t start, end;
499
500 // this is so that seeking on a streamed file can work.
501 rtsp_parse_range_npt(p, &start, &end);
502 s->start_time = start;
503 /* AV_NOPTS_VALUE means live broadcast (and can't seek) */
504 s->duration = (end == AV_NOPTS_VALUE) ?
505 AV_NOPTS_VALUE : end - start;
506 } else if (av_strstart(p, "IsRealDataType:integer;",&p)) {
507 if (atoi(p) == 1)
508 rt->transport = RTSP_TRANSPORT_RDT;
509 } else {
510 if (rt->server_type == RTSP_SERVER_WMS)
511 ff_wms_parse_sdp_a_line(s, p);
512 if (s->nb_streams > 0) {
513 if (rt->server_type == RTSP_SERVER_REAL)
514 ff_real_parse_sdp_a_line(s, s->nb_streams - 1, p);
515
516 rtsp_st = s->streams[s->nb_streams - 1]->priv_data;
517 if (rtsp_st->dynamic_handler &&
518 rtsp_st->dynamic_handler->parse_sdp_a_line)
519 rtsp_st->dynamic_handler->parse_sdp_a_line(s,
520 s->nb_streams - 1,
521 rtsp_st->dynamic_protocol_context, buf);
522 }
523 }
524 break;
525 }
526 }
527
528 static int sdp_parse(AVFormatContext *s, const char *content)
529 {
530 const char *p;
531 int letter;
532 /* Some SDP lines, particularly for Realmedia or ASF RTSP streams,
533 * contain long SDP lines containing complete ASF Headers (several
534 * kB) or arrays of MDPR (RM stream descriptor) headers plus
535 * "rulebooks" describing their properties. Therefore, the SDP line
536 * buffer is large.
537 *
538 * The Vorbis FMTP line can be up to 16KB - see sdp_parse_fmtp. */
539 char buf[16384], *q;
540 SDPParseState sdp_parse_state, *s1 = &sdp_parse_state;
541
542 memset(s1, 0, sizeof(SDPParseState));
543 p = content;
544 for (;;) {
545 skip_spaces(&p);
546 letter = *p;
547 if (letter == '\0')
548 break;
549 p++;
550 if (*p != '=')
551 goto next_line;
552 p++;
553 /* get the content */
554 q = buf;
555 while (*p != '\n' && *p != '\r' && *p != '\0') {
556 if ((q - buf) < sizeof(buf) - 1)
557 *q++ = *p;
558 p++;
559 }
560 *q = '\0';
561 sdp_parse_line(s, s1, letter, buf);
562 next_line:
563 while (*p != '\n' && *p != '\0')
564 p++;
565 if (*p == '\n')
566 p++;
567 }
568 return 0;
569 }
570
571 /* close and free RTSP streams */
572 void ff_rtsp_close_streams(AVFormatContext *s)
573 {
574 RTSPState *rt = s->priv_data;
575 int i;
576 RTSPStream *rtsp_st;
577
578 for (i = 0; i < rt->nb_rtsp_streams; i++) {
579 rtsp_st = rt->rtsp_streams[i];
580 if (rtsp_st) {
581 if (rtsp_st->transport_priv) {
582 if (s->oformat) {
583 AVFormatContext *rtpctx = rtsp_st->transport_priv;
584 av_write_trailer(rtpctx);
585 url_fclose(rtpctx->pb);
586 av_metadata_free(&rtpctx->streams[0]->metadata);
587 av_metadata_free(&rtpctx->metadata);
588 av_free(rtpctx->streams[0]);
589 av_free(rtpctx);
590 } else if (rt->transport == RTSP_TRANSPORT_RDT)
591 ff_rdt_parse_close(rtsp_st->transport_priv);
592 else
593 rtp_parse_close(rtsp_st->transport_priv);
594 }
595 if (rtsp_st->rtp_handle)
596 url_close(rtsp_st->rtp_handle);
597 if (rtsp_st->dynamic_handler && rtsp_st->dynamic_protocol_context)
598 rtsp_st->dynamic_handler->close(
599 rtsp_st->dynamic_protocol_context);
600 }
601 }
602 av_free(rt->rtsp_streams);
603 if (rt->asf_ctx) {
604 av_close_input_stream (rt->asf_ctx);
605 rt->asf_ctx = NULL;
606 }
607 av_freep(&rt->auth_b64);
608 }
609
610 static void *rtsp_rtp_mux_open(AVFormatContext *s, AVStream *st, URLContext *handle) {
611 AVFormatContext *rtpctx;
612 int ret;
613 AVOutputFormat *rtp_format = av_guess_format("rtp", NULL, NULL);
614
615 if (!rtp_format)
616 return NULL;
617
618 /* Allocate an AVFormatContext for each output stream */
619 rtpctx = avformat_alloc_context();
620 if (!rtpctx)
621 return NULL;
622
623 rtpctx->oformat = rtp_format;
624 if (!av_new_stream(rtpctx, 0)) {
625 av_free(rtpctx);
626 return NULL;
627 }
628 /* Copy the max delay setting; the rtp muxer reads this. */
629 rtpctx->max_delay = s->max_delay;
630 /* Copy other stream parameters. */
631 rtpctx->streams[0]->sample_aspect_ratio = st->sample_aspect_ratio;
632
633 /* Remove the local codec, link to the original codec
634 * context instead, to give the rtp muxer access to
635 * codec parameters. */
636 av_free(rtpctx->streams[0]->codec);
637 rtpctx->streams[0]->codec = st->codec;
638
639 url_fdopen(&rtpctx->pb, handle);
640 ret = av_write_header(rtpctx);
641
642 if (ret) {
643 url_fclose(rtpctx->pb);
644 av_free(rtpctx->streams[0]);
645 av_free(rtpctx);
646 return NULL;
647 }
648
649 /* Copy the RTP AVStream timebase back to the original AVStream */
650 st->time_base = rtpctx->streams[0]->time_base;
651 return rtpctx;
652 }
653
654 static int rtsp_open_transport_ctx(AVFormatContext *s, RTSPStream *rtsp_st)
655 {
656 RTSPState *rt = s->priv_data;
657 AVStream *st = NULL;
658
659 /* open the RTP context */
660 if (rtsp_st->stream_index >= 0)
661 st = s->streams[rtsp_st->stream_index];
662 if (!st)
663 s->ctx_flags |= AVFMTCTX_NOHEADER;
664
665 if (s->oformat) {
666 rtsp_st->transport_priv = rtsp_rtp_mux_open(s, st, rtsp_st->rtp_handle);
667 /* Ownage of rtp_handle is passed to the rtp mux context */
668 rtsp_st->rtp_handle = NULL;
669 } else if (rt->transport == RTSP_TRANSPORT_RDT)
670 rtsp_st->transport_priv = ff_rdt_parse_open(s, st->index,
671 rtsp_st->dynamic_protocol_context,
672 rtsp_st->dynamic_handler);
673 else
674 rtsp_st->transport_priv = rtp_parse_open(s, st, rtsp_st->rtp_handle,
675 rtsp_st->sdp_payload_type,
676 &rtsp_st->rtp_payload_data);
677
678 if (!rtsp_st->transport_priv) {
679 return AVERROR(ENOMEM);
680 } else if (rt->transport != RTSP_TRANSPORT_RDT) {
681 if (rtsp_st->dynamic_handler) {
682 rtp_parse_set_dynamic_protocol(rtsp_st->transport_priv,
683 rtsp_st->dynamic_protocol_context,
684 rtsp_st->dynamic_handler);
685 }
686 }
687
688 return 0;
689 }
690
691 #if CONFIG_RTSP_DEMUXER || CONFIG_RTSP_MUXER
692 static int rtsp_probe(AVProbeData *p)
693 {
694 if (av_strstart(p->filename, "rtsp:", NULL))
695 return AVPROBE_SCORE_MAX;
696 return 0;
697 }
698
699 static void rtsp_parse_range(int *min_ptr, int *max_ptr, const char **pp)
700 {
701 const char *p;
702 int v;
703
704 p = *pp;
705 skip_spaces(&p);
706 v = strtol(p, (char **)&p, 10);
707 if (*p == '-') {
708 p++;
709 *min_ptr = v;
710 v = strtol(p, (char **)&p, 10);
711 *max_ptr = v;
712 } else {
713 *min_ptr = v;
714 *max_ptr = v;
715 }
716 *pp = p;
717 }
718
719 /* XXX: only one transport specification is parsed */
720 static void rtsp_parse_transport(RTSPMessageHeader *reply, const char *p)
721 {
722 char transport_protocol[16];
723 char profile[16];
724 char lower_transport[16];
725 char parameter[16];
726 RTSPTransportField *th;
727 char buf[256];
728
729 reply->nb_transports = 0;
730
731 for (;;) {
732 skip_spaces(&p);
733 if (*p == '\0')
734 break;
735
736 th = &reply->transports[reply->nb_transports];
737
738 get_word_sep(transport_protocol, sizeof(transport_protocol),
739 "/", &p);
740 if (!strcasecmp (transport_protocol, "rtp")) {
741 get_word_sep(profile, sizeof(profile), "/;,", &p);
742 lower_transport[0] = '\0';
743 /* rtp/avp/<protocol> */
744 if (*p == '/') {
745 get_word_sep(lower_transport, sizeof(lower_transport),
746 ";,", &p);
747 }
748 th->transport = RTSP_TRANSPORT_RTP;
749 } else if (!strcasecmp (transport_protocol, "x-pn-tng") ||
750 !strcasecmp (transport_protocol, "x-real-rdt")) {
751 /* x-pn-tng/<protocol> */
752 get_word_sep(lower_transport, sizeof(lower_transport), "/;,", &p);
753 profile[0] = '\0';
754 th->transport = RTSP_TRANSPORT_RDT;
755 }
756 if (!strcasecmp(lower_transport, "TCP"))
757 th->lower_transport = RTSP_LOWER_TRANSPORT_TCP;
758 else
759 th->lower_transport = RTSP_LOWER_TRANSPORT_UDP;
760
761 if (*p == ';')
762 p++;
763 /* get each parameter */
764 while (*p != '\0' && *p != ',') {
765 get_word_sep(parameter, sizeof(parameter), "=;,", &p);
766 if (!strcmp(parameter, "port")) {
767 if (*p == '=') {
768 p++;
769 rtsp_parse_range(&th->port_min, &th->port_max, &p);
770 }
771 } else if (!strcmp(parameter, "client_port")) {
772 if (*p == '=') {
773 p++;
774 rtsp_parse_range(&th->client_port_min,
775 &th->client_port_max, &p);
776 }
777 } else if (!strcmp(parameter, "server_port")) {
778 if (*p == '=') {
779 p++;
780 rtsp_parse_range(&th->server_port_min,
781 &th->server_port_max, &p);
782 }
783 } else if (!strcmp(parameter, "interleaved")) {
784 if (*p == '=') {
785 p++;
786 rtsp_parse_range(&th->interleaved_min,
787 &th->interleaved_max, &p);
788 }
789 } else if (!strcmp(parameter, "multicast")) {
790 if (th->lower_transport == RTSP_LOWER_TRANSPORT_UDP)
791 th->lower_transport = RTSP_LOWER_TRANSPORT_UDP_MULTICAST;
792 } else if (!strcmp(parameter, "ttl")) {
793 if (*p == '=') {
794 p++;
795 th->ttl = strtol(p, (char **)&p, 10);
796 }
797 } else if (!strcmp(parameter, "destination")) {
798 struct in_addr ipaddr;
799
800 if (*p == '=') {
801 p++;
802 get_word_sep(buf, sizeof(buf), ";,", &p);
803 if (ff_inet_aton(buf, &ipaddr))
804 th->destination = ntohl(ipaddr.s_addr);
805 }
806 }
807 while (*p != ';' && *p != '\0' && *p != ',')
808 p++;
809 if (*p == ';')
810 p++;
811 }
812 if (*p == ',')
813 p++;
814
815 reply->nb_transports++;
816 }
817 }
818
819 void ff_rtsp_parse_line(RTSPMessageHeader *reply, const char *buf)
820 {
821 const char *p;
822
823 /* NOTE: we do case independent match for broken servers */
824 p = buf;
825 if (av_stristart(p, "Session:", &p)) {
826 int t;
827 get_word_sep(reply->session_id, sizeof(reply->session_id), ";", &p);
828 if (av_stristart(p, ";timeout=", &p) &&
829 (t = strtol(p, NULL, 10)) > 0) {
830 reply->timeout = t;
831 }
832 } else if (av_stristart(p, "Content-Length:", &p)) {
833 reply->content_length = strtol(p, NULL, 10);
834 } else if (av_stristart(p, "Transport:", &p)) {
835 rtsp_parse_transport(reply, p);
836 } else if (av_stristart(p, "CSeq:", &p)) {
837 reply->seq = strtol(p, NULL, 10);
838 } else if (av_stristart(p, "Range:", &p)) {
839 rtsp_parse_range_npt(p, &reply->range_start, &reply->range_end);
840 } else if (av_stristart(p, "RealChallenge1:", &p)) {
841 skip_spaces(&p);
842 av_strlcpy(reply->real_challenge, p, sizeof(reply->real_challenge));
843 } else if (av_stristart(p, "Server:", &p)) {
844 skip_spaces(&p);
845 av_strlcpy(reply->server, p, sizeof(reply->server));
846 } else if (av_stristart(p, "Notice:", &p) ||
847 av_stristart(p, "X-Notice:", &p)) {
848 reply->notice = strtol(p, NULL, 10);
849 } else if (av_stristart(p, "Location:", &p)) {
850 skip_spaces(&p);
851 av_strlcpy(reply->location, p , sizeof(reply->location));
852 }
853 }
854
855 /* skip a RTP/TCP interleaved packet */
856 static void rtsp_skip_packet(AVFormatContext *s)
857 {
858 RTSPState *rt = s->priv_data;
859 int ret, len, len1;
860 uint8_t buf[1024];
861
862 ret = url_read_complete(rt->rtsp_hd, buf, 3);
863 if (ret != 3)
864 return;
865 len = AV_RB16(buf + 1);
866
867 dprintf(s, "skipping RTP packet len=%d\n", len);
868
869 /* skip payload */
870 while (len > 0) {
871 len1 = len;
872 if (len1 > sizeof(buf))
873 len1 = sizeof(buf);
874 ret = url_read_complete(rt->rtsp_hd, buf, len1);
875 if (ret != len1)
876 return;
877 len -= len1;
878 }
879 }
880
881 int ff_rtsp_read_reply(AVFormatContext *s, RTSPMessageHeader *reply,
882 unsigned char **content_ptr,
883 int return_on_interleaved_data)
884 {
885 RTSPState *rt = s->priv_data;
886 char buf[4096], buf1[1024], *q;
887 unsigned char ch;
888 const char *p;
889 int ret, content_length, line_count = 0;
890 unsigned char *content = NULL;
891
892 memset(reply, 0, sizeof(*reply));
893
894 /* parse reply (XXX: use buffers) */
895 rt->last_reply[0] = '\0';
896 for (;;) {
897 q = buf;
898 for (;;) {
899 ret = url_read_complete(rt->rtsp_hd, &ch, 1);
900 #ifdef DEBUG_RTP_TCP
901 dprintf(s, "ret=%d c=%02x [%c]\n", ret, ch, ch);
902 #endif
903 if (ret != 1)
904 return -1;
905 if (ch == '\n')
906 break;
907 if (ch == '$') {
908 /* XXX: only parse it if first char on line ? */
909 if (return_on_interleaved_data) {
910 return 1;
911 } else
912 rtsp_skip_packet(s);
913 } else if (ch != '\r') {
914 if ((q - buf) < sizeof(buf) - 1)
915 *q++ = ch;
916 }
917 }
918 *q = '\0';
919
920 dprintf(s, "line='%s'\n", buf);
921
922 /* test if last line */
923 if (buf[0] == '\0')
924 break;
925 p = buf;
926 if (line_count == 0) {
927 /* get reply code */
928 get_word(buf1, sizeof(buf1), &p);
929 get_word(buf1, sizeof(buf1), &p);
930 reply->status_code = atoi(buf1);
931 } else {
932 ff_rtsp_parse_line(reply, p);
933 av_strlcat(rt->last_reply, p, sizeof(rt->last_reply));
934 av_strlcat(rt->last_reply, "\n", sizeof(rt->last_reply));
935 }
936 line_count++;
937 }
938
939 if (rt->session_id[0] == '\0' && reply->session_id[0] != '\0')
940 av_strlcpy(rt->session_id, reply->session_id, sizeof(rt->session_id));
941
942 content_length = reply->content_length;
943 if (content_length > 0) {
944 /* leave some room for a trailing '\0' (useful for simple parsing) */
945 content = av_malloc(content_length + 1);
946 (void)url_read_complete(rt->rtsp_hd, content, content_length);
947 content[content_length] = '\0';
948 }
949 if (content_ptr)
950 *content_ptr = content;
951 else
952 av_free(content);
953
954 /* EOS */
955 if (reply->notice == 2101 /* End-of-Stream Reached */ ||
956 reply->notice == 2104 /* Start-of-Stream Reached */ ||
957 reply->notice == 2306 /* Continuous Feed Terminated */) {
958 rt->state = RTSP_STATE_IDLE;
959 } else if (reply->notice >= 4400 && reply->notice < 5500) {
960 return AVERROR(EIO); /* data or server error */
961 } else if (reply->notice == 2401 /* Ticket Expired */ ||
962 (reply->notice >= 5500 && reply->notice < 5600) /* end of term */ )
963 return AVERROR(EPERM);
964
965 return 0;
966 }
967
968 void ff_rtsp_send_cmd_with_content_async(AVFormatContext *s,
969 const char *cmd,
970 const unsigned char *send_content,
971 int send_content_length)
972 {
973 RTSPState *rt = s->priv_data;
974 char buf[4096], buf1[1024];
975
976 rt->seq++;
977 av_strlcpy(buf, cmd, sizeof(buf));
978 snprintf(buf1, sizeof(buf1), "CSeq: %d\r\n", rt->seq);
979 av_strlcat(buf, buf1, sizeof(buf));
980 if (rt->session_id[0] != '\0' && !strstr(cmd, "\nIf-Match:")) {
981 snprintf(buf1, sizeof(buf1), "Session: %s\r\n", rt->session_id);
982 av_strlcat(buf, buf1, sizeof(buf));
983 }
984 if (rt->auth_b64)
985 av_strlcatf(buf, sizeof(buf),
986 "Authorization: Basic %s\r\n",
987 rt->auth_b64);
988 if (send_content_length > 0 && send_content)
989 av_strlcatf(buf, sizeof(buf), "Content-Length: %d\r\n", send_content_length);
990 av_strlcat(buf, "\r\n", sizeof(buf));
991
992 dprintf(s, "Sending:\n%s--\n", buf);
993
994 url_write(rt->rtsp_hd, buf, strlen(buf));
995 if (send_content_length > 0 && send_content)
996 url_write(rt->rtsp_hd, send_content, send_content_length);
997 rt->last_cmd_time = av_gettime();
998 }
999
1000 void ff_rtsp_send_cmd_async(AVFormatContext *s, const char *cmd)
1001 {
1002 ff_rtsp_send_cmd_with_content_async(s, cmd, NULL, 0);
1003 }
1004
1005 void ff_rtsp_send_cmd(AVFormatContext *s,
1006 const char *cmd, RTSPMessageHeader *reply,
1007 unsigned char **content_ptr)
1008 {
1009 ff_rtsp_send_cmd_async(s, cmd);
1010
1011 ff_rtsp_read_reply(s, reply, content_ptr, 0);
1012 }
1013
1014 void ff_rtsp_send_cmd_with_content(AVFormatContext *s,
1015 const char *cmd,
1016 RTSPMessageHeader *reply,
1017 unsigned char **content_ptr,
1018 const unsigned char *send_content,
1019 int send_content_length)
1020 {
1021 ff_rtsp_send_cmd_with_content_async(s, cmd, send_content, send_content_length);
1022
1023 ff_rtsp_read_reply(s, reply, content_ptr, 0);
1024 }
1025
1026 /**
1027 * @returns 0 on success, <0 on error, 1 if protocol is unavailable.
1028 */
1029 static int make_setup_request(AVFormatContext *s, const char *host, int port,
1030 int lower_transport, const char *real_challenge)
1031 {
1032 RTSPState *rt = s->priv_data;
1033 int rtx, j, i, err, interleave = 0;
1034 RTSPStream *rtsp_st;
1035 RTSPMessageHeader reply1, *reply = &reply1;
1036 char cmd[2048];
1037 const char *trans_pref;
1038
1039 if (rt->transport == RTSP_TRANSPORT_RDT)
1040 trans_pref = "x-pn-tng";
1041 else
1042 trans_pref = "RTP/AVP";
1043
1044 /* default timeout: 1 minute */
1045 rt->timeout = 60;
1046
1047 /* for each stream, make the setup request */
1048 /* XXX: we assume the same server is used for the control of each
1049 * RTSP stream */
1050
1051 for (j = RTSP_RTP_PORT_MIN, i = 0; i < rt->nb_rtsp_streams; ++i) {
1052 char transport[2048];
1053
1054 /**
1055 * WMS serves all UDP data over a single connection, the RTX, which
1056 * isn't necessarily the first in the SDP but has to be the first
1057 * to be set up, else the second/third SETUP will fail with a 461.
1058 */
1059 if (lower_transport == RTSP_LOWER_TRANSPORT_UDP &&
1060 rt->server_type == RTSP_SERVER_WMS) {
1061 if (i == 0) {
1062 /* rtx first */
1063 for (rtx = 0; rtx < rt->nb_rtsp_streams; rtx++) {
1064 int len = strlen(rt->rtsp_streams[rtx]->control_url);
1065 if (len >= 4 &&
1066 !strcmp(rt->rtsp_streams[rtx]->control_url + len - 4,
1067 "/rtx"))
1068 break;
1069 }
1070 if (rtx == rt->nb_rtsp_streams)
1071 return -1; /* no RTX found */
1072 rtsp_st = rt->rtsp_streams[rtx];
1073 } else
1074 rtsp_st = rt->rtsp_streams[i > rtx ? i : i - 1];
1075 } else
1076 rtsp_st = rt->rtsp_streams[i];
1077
1078 /* RTP/UDP */
1079 if (lower_transport == RTSP_LOWER_TRANSPORT_UDP) {
1080 char buf[256];
1081
1082 if (rt->server_type == RTSP_SERVER_WMS && i > 1) {
1083 port = reply->transports[0].client_port_min;
1084 goto have_port;
1085 }
1086
1087 /* first try in specified port range */
1088 if (RTSP_RTP_PORT_MIN != 0) {
1089 while (j <= RTSP_RTP_PORT_MAX) {
1090 ff_url_join(buf, sizeof(buf), "rtp", NULL, host, -1,
1091 "?localport=%d", j);
1092 /* we will use two ports per rtp stream (rtp and rtcp) */
1093 j += 2;
1094 if (url_open(&rtsp_st->rtp_handle, buf, URL_RDWR) == 0)
1095 goto rtp_opened;
1096 }
1097 }
1098
1099 #if 0
1100 /* then try on any port */
1101 if (url_open(&rtsp_st->rtp_handle, "rtp://", URL_RDONLY) < 0) {
1102 err = AVERROR_INVALIDDATA;
1103 goto fail;
1104 }
1105 #endif
1106
1107 rtp_opened:
1108 port = rtp_get_local_port(rtsp_st->rtp_handle);
1109 have_port:
1110 snprintf(transport, sizeof(transport) - 1,
1111 "%s/UDP;", trans_pref);
1112 if (rt->server_type != RTSP_SERVER_REAL)
1113 av_strlcat(transport, "unicast;", sizeof(transport));
1114 av_strlcatf(transport, sizeof(transport),
1115 "client_port=%d", port);
1116 if (rt->transport == RTSP_TRANSPORT_RTP &&
1117 !(rt->server_type == RTSP_SERVER_WMS && i > 0))
1118 av_strlcatf(transport, sizeof(transport), "-%d", port + 1);
1119 }
1120
1121 /* RTP/TCP */
1122 else if (lower_transport == RTSP_LOWER_TRANSPORT_TCP) {
1123 /** For WMS streams, the application streams are only used for
1124 * UDP. When trying to set it up for TCP streams, the server
1125 * will return an error. Therefore, we skip those streams. */
1126 if (rt->server_type == RTSP_SERVER_WMS &&
1127 s->streams[rtsp_st->stream_index]->codec->codec_type ==
1128 CODEC_TYPE_DATA)
1129 continue;
1130 snprintf(transport, sizeof(transport) - 1,
1131 "%s/TCP;", trans_pref);
1132 if (rt->server_type == RTSP_SERVER_WMS)
1133 av_strlcat(transport, "unicast;", sizeof(transport));
1134 av_strlcatf(transport, sizeof(transport),
1135 "interleaved=%d-%d",
1136 interleave, interleave + 1);
1137 interleave += 2;
1138 }
1139
1140 else if (lower_transport == RTSP_LOWER_TRANSPORT_UDP_MULTICAST) {
1141 snprintf(transport, sizeof(transport) - 1,
1142 "%s/UDP;multicast", trans_pref);
1143 }
1144 if (s->oformat) {
1145 av_strlcat(transport, ";mode=receive", sizeof(transport));
1146 } else if (rt->server_type == RTSP_SERVER_REAL ||
1147 rt->server_type == RTSP_SERVER_WMS)
1148 av_strlcat(transport, ";mode=play", sizeof(transport));
1149 snprintf(cmd, sizeof(cmd),
1150 "SETUP %s RTSP/1.0\r\n"
1151 "Transport: %s\r\n",
1152 rtsp_st->control_url, transport);
1153 if (i == 0 && rt->server_type == RTSP_SERVER_REAL) {
1154 char real_res[41], real_csum[9];
1155 ff_rdt_calc_response_and_checksum(real_res, real_csum,
1156 real_challenge);
1157 av_strlcatf(cmd, sizeof(cmd),
1158 "If-Match: %s\r\n"
1159 "RealChallenge2: %s, sd=%s\r\n",
1160 rt->session_id, real_res, real_csum);
1161 }
1162 ff_rtsp_send_cmd(s, cmd, reply, NULL);
1163 if (reply->status_code == 461 /* Unsupported protocol */ && i == 0) {
1164 err = 1;
1165 goto fail;
1166 } else if (reply->status_code != RTSP_STATUS_OK ||
1167 reply->nb_transports != 1) {
1168 err = AVERROR_INVALIDDATA;
1169 goto fail;
1170 }
1171
1172 /* XXX: same protocol for all streams is required */
1173 if (i > 0) {
1174 if (reply->transports[0].lower_transport != rt->lower_transport ||
1175 reply->transports[0].transport != rt->transport) {
1176 err = AVERROR_INVALIDDATA;
1177 goto fail;
1178 }
1179 } else {
1180 rt->lower_transport = reply->transports[0].lower_transport;
1181 rt->transport = reply->transports[0].transport;
1182 }
1183
1184 /* close RTP connection if not choosen */
1185 if (reply->transports[0].lower_transport != RTSP_LOWER_TRANSPORT_UDP &&
1186 (lower_transport == RTSP_LOWER_TRANSPORT_UDP)) {
1187 url_close(rtsp_st->rtp_handle);
1188 rtsp_st->rtp_handle = NULL;
1189 }
1190
1191 switch(reply->transports[0].lower_transport) {
1192 case RTSP_LOWER_TRANSPORT_TCP:
1193 rtsp_st->interleaved_min = reply->transports[0].interleaved_min;
1194 rtsp_st->interleaved_max = reply->transports[0].interleaved_max;
1195 break;
1196
1197 case RTSP_LOWER_TRANSPORT_UDP: {
1198 char url[1024];
1199
1200 /* XXX: also use address if specified */
1201 ff_url_join(url, sizeof(url), "rtp", NULL, host,
1202 reply->transports[0].server_port_min, NULL);
1203 if (!(rt->server_type == RTSP_SERVER_WMS && i > 1) &&
1204 rtp_set_remote_url(rtsp_st->rtp_handle, url) < 0) {
1205 err = AVERROR_INVALIDDATA;
1206 goto fail;
1207 }
1208 /* Try to initialize the connection state in a
1209 * potential NAT router by sending dummy packets.
1210 * RTP/RTCP dummy packets are used for RDT, too.
1211 */
1212 if (!(rt->server_type == RTSP_SERVER_WMS && i > 1) && s->iformat)
1213 rtp_send_punch_packets(rtsp_st->rtp_handle);
1214 break;
1215 }
1216 case RTSP_LOWER_TRANSPORT_UDP_MULTICAST: {
1217 char url[1024];
1218 struct in_addr in;
1219 int port, ttl;
1220
1221 if (reply->transports[0].destination) {
1222 in.s_addr = htonl(reply->transports[0].destination);
1223 port = reply->transports[0].port_min;
1224 ttl = reply->transports[0].ttl;
1225 } else {
1226 in = rtsp_st->sdp_ip;
1227 port = rtsp_st->sdp_port;
1228 ttl = rtsp_st->sdp_ttl;
1229 }
1230 ff_url_join(url, sizeof(url), "rtp", NULL, inet_ntoa(in),
1231 port, "?ttl=%d", ttl);
1232 if (url_open(&rtsp_st->rtp_handle, url, URL_RDWR) < 0) {
1233 err = AVERROR_INVALIDDATA;
1234 goto fail;
1235 }
1236 break;
1237 }
1238 }
1239
1240 if ((err = rtsp_open_transport_ctx(s, rtsp_st)))
1241 goto fail;
1242 }
1243
1244 if (reply->timeout > 0)
1245 rt->timeout = reply->timeout;
1246
1247 if (rt->server_type == RTSP_SERVER_REAL)
1248 rt->need_subscription = 1;
1249
1250 return 0;
1251
1252 fail:
1253 for (i = 0; i < rt->nb_rtsp_streams; i++) {
1254 if (rt->rtsp_streams[i]->rtp_handle) {
1255 url_close(rt->rtsp_streams[i]->rtp_handle);
1256 rt->rtsp_streams[i]->rtp_handle = NULL;
1257 }
1258 }
1259 return err;
1260 }
1261
1262 static int rtsp_read_play(AVFormatContext *s)
1263 {
1264 RTSPState *rt = s->priv_data;
1265 RTSPMessageHeader reply1, *reply = &reply1;
1266 char cmd[1024];
1267
1268 av_log(s, AV_LOG_DEBUG, "hello state=%d\n", rt->state);
1269
1270 if (!(rt->server_type == RTSP_SERVER_REAL && rt->need_subscription)) {
1271 if (rt->state == RTSP_STATE_PAUSED) {
1272 snprintf(cmd, sizeof(cmd),
1273 "PLAY %s RTSP/1.0\r\n",
1274 rt->control_uri);
1275 } else {
1276 snprintf(cmd, sizeof(cmd),
1277 "PLAY %s RTSP/1.0\r\n"
1278 "Range: npt=%0.3f-\r\n",
1279 rt->control_uri,
1280 (double)rt->seek_timestamp / AV_TIME_BASE);
1281 }
1282 ff_rtsp_send_cmd(s, cmd, reply, NULL);
1283 if (reply->status_code != RTSP_STATUS_OK) {
1284 return -1;
1285 }
1286 }
1287 rt->state = RTSP_STATE_STREAMING;
1288 return 0;
1289 }
1290
1291 static int rtsp_setup_input_streams(AVFormatContext *s)
1292 {
1293 RTSPState *rt = s->priv_data;
1294 RTSPMessageHeader reply1, *reply = &reply1;
1295 char cmd[1024];
1296 unsigned char *content = NULL;
1297 int ret;
1298
1299 /* describe the stream */
1300 snprintf(cmd, sizeof(cmd),
1301 "DESCRIBE %s RTSP/1.0\r\n"
1302 "Accept: application/sdp\r\n",
1303 s->filename);
1304 if (rt->server_type == RTSP_SERVER_REAL) {
1305 /**
1306 * The Require: attribute is needed for proper streaming from
1307 * Realmedia servers.
1308 */
1309 av_strlcat(cmd,
1310 "Require: com.real.retain-entity-for-setup\r\n",
1311 sizeof(cmd));
1312 }
1313 ff_rtsp_send_cmd(s, cmd, reply, &content);
1314 if (!content)
1315 return AVERROR_INVALIDDATA;
1316 if (reply->status_code != RTSP_STATUS_OK) {
1317 av_freep(&content);
1318 return AVERROR_INVALIDDATA;
1319 }
1320
1321 /* now we got the SDP description, we parse it */
1322 ret = sdp_parse(s, (const char *)content);
1323 av_freep(&content);
1324 if (ret < 0)
1325 return AVERROR_INVALIDDATA;
1326
1327 return 0;
1328 }
1329
1330 static int rtsp_setup_output_streams(AVFormatContext *s)
1331 {
1332 RTSPState *rt = s->priv_data;
1333 RTSPMessageHeader reply1, *reply = &reply1;
1334 char cmd[1024];
1335 int i;
1336 char *sdp;
1337
1338 /* Announce the stream */
1339 snprintf(cmd, sizeof(cmd),
1340 "ANNOUNCE %s RTSP/1.0\r\n"
1341 "Content-Type: application/sdp\r\n",
1342 s->filename);
1343 sdp = av_mallocz(8192);
1344 if (sdp == NULL)
1345 return AVERROR(ENOMEM);
1346 if (avf_sdp_create(&s, 1, sdp, 8192)) {
1347 av_free(sdp);
1348 return AVERROR_INVALIDDATA;
1349 }
1350 av_log(s, AV_LOG_INFO, "SDP:\n%s\n", sdp);
1351 ff_rtsp_send_cmd_with_content(s, cmd, reply, NULL, sdp, strlen(sdp));
1352 av_free(sdp);
1353 if (reply->status_code != RTSP_STATUS_OK)
1354 return AVERROR_INVALIDDATA;
1355
1356 /* Set up the RTSPStreams for each AVStream */
1357 for (i = 0; i < s->nb_streams; i++) {
1358 RTSPStream *rtsp_st;
1359 AVStream *st = s->streams[i];
1360
1361 rtsp_st = av_mallocz(sizeof(RTSPStream));
1362 if (!rtsp_st)
1363 return AVERROR(ENOMEM);
1364 dynarray_add(&rt->rtsp_streams, &rt->nb_rtsp_streams, rtsp_st);
1365
1366 st->priv_data = rtsp_st;
1367 rtsp_st->stream_index = i;
1368
1369 av_strlcpy(rtsp_st->control_url, s->filename, sizeof(rtsp_st->control_url));
1370 /* Note, this must match the relative uri set in the sdp content */
1371 av_strlcatf(rtsp_st->control_url, sizeof(rtsp_st->control_url),
1372 "/streamid=%d", i);
1373 }
1374
1375 return 0;
1376 }
1377
1378 int ff_rtsp_connect(AVFormatContext *s)
1379 {
1380 RTSPState *rt = s->priv_data;
1381 char host[1024], path[1024], tcpname[1024], cmd[2048], auth[128];
1382 char *option_list, *option, *filename;
1383 URLContext *rtsp_hd;
1384 int port, err;
1385 RTSPMessageHeader reply1, *reply = &reply1;
1386 int lower_transport_mask = 0;
1387 char real_challenge[64];
1388
1389 if (!ff_network_init())
1390 return AVERROR(EIO);
1391 redirect:
1392 /* extract hostname and port */
1393 ff_url_split(NULL, 0, auth, sizeof(auth),
1394 host, sizeof(host), &port, path, sizeof(path), s->filename);
1395 if (*auth) {
1396 int auth_len = strlen(auth), b64_len = ((auth_len + 2) / 3) * 4 + 1;
1397
1398 if (!(rt->auth_b64 = av_malloc(b64_len)))
1399 return AVERROR(ENOMEM);
1400 if (!av_base64_encode(rt->auth_b64, b64_len, auth, auth_len)) {
1401 err = AVERROR(EINVAL);
1402 goto fail;
1403 }
1404 }
1405 if (port < 0)
1406 port = RTSP_DEFAULT_PORT;
1407
1408 /* search for options */
1409 option_list = strchr(path, '?');
1410 if (option_list) {
1411 filename = strchr(s->filename, '?');
1412 while (option_list) {
1413 /* move the option pointer */
1414 option = ++option_list;
1415 option_list = strchr(option_list, '&');
1416 if (option_list)
1417 *option_list = 0;
1418
1419 /* handle the options */
1420 if (!strcmp(option, "udp")) {
1421 lower_transport_mask = (1<< RTSP_LOWER_TRANSPORT_UDP);
1422 } else if (!strcmp(option, "multicast")) {
1423 lower_transport_mask = (1<< RTSP_LOWER_TRANSPORT_UDP_MULTICAST);
1424 } else if (!strcmp(option, "tcp")) {
1425 lower_transport_mask = (1<< RTSP_LOWER_TRANSPORT_TCP);
1426 } else {
1427 strcpy(++filename, option);
1428 filename += strlen(option);
1429 if (option_list) *filename = '&';
1430 }
1431 }
1432 *filename = 0;
1433 }
1434
1435 if (!lower_transport_mask)
1436 lower_transport_mask = (1 << RTSP_LOWER_TRANSPORT_NB) - 1;
1437
1438 if (s->oformat) {
1439 /* Only UDP output is supported at the moment. */
1440 lower_transport_mask &= 1 << RTSP_LOWER_TRANSPORT_UDP;
1441 if (!lower_transport_mask) {
1442 av_log(s, AV_LOG_ERROR, "Unsupported lower transport method, "
1443 "only UDP is supported for output.\n");
1444 err = AVERROR(EINVAL);
1445 goto fail;
1446 }
1447 }
1448
1449 /* open the tcp connexion */
1450 ff_url_join(tcpname, sizeof(tcpname), "tcp", NULL, host, port, NULL);
1451 if (url_open(&rtsp_hd, tcpname, URL_RDWR) < 0) {
1452 err = AVERROR(EIO);
1453 goto fail;
1454 }
1455 rt->rtsp_hd = rtsp_hd;
1456 rt->seq = 0;
1457
1458 /* request options supported by the server; this also detects server
1459 * type */
1460 av_strlcpy(rt->control_uri, s->filename,
1461 sizeof(rt->control_uri));
1462 for (rt->server_type = RTSP_SERVER_RTP;;) {
1463 snprintf(cmd, sizeof(cmd),
1464 "OPTIONS %s RTSP/1.0\r\n", s->filename);
1465 if (rt->server_type == RTSP_SERVER_REAL)
1466 av_strlcat(cmd,
1467 /**
1468 * The following entries are required for proper
1469 * streaming from a Realmedia server. They are
1470 * interdependent in some way although we currently
1471 * don't quite understand how. Values were copied
1472 * from mplayer SVN r23589.
1473 * @param CompanyID is a 16-byte ID in base64
1474 * @param ClientChallenge is a 16-byte ID in hex
1475 */
1476 "ClientChallenge: 9e26d33f2984236010ef6253fb1887f7\r\n"
1477 "PlayerStarttime: [28/03/2003:22:50:23 00:00]\r\n"
1478 "CompanyID: KnKV4M4I/B2FjJ1TToLycw==\r\n"
1479 "GUID: 00000000-0000-0000-0000-000000000000\r\n",
1480 sizeof(cmd));
1481 ff_rtsp_send_cmd(s, cmd, reply, NULL);
1482 if (reply->status_code != RTSP_STATUS_OK) {
1483 err = AVERROR_INVALIDDATA;
1484 goto fail;
1485 }
1486
1487 /* detect server type if not standard-compliant RTP */
1488 if (rt->server_type != RTSP_SERVER_REAL && reply->real_challenge[0]) {
1489 rt->server_type = RTSP_SERVER_REAL;
1490 continue;
1491 } else if (!strncasecmp(reply->server, "WMServer/", 9)) {
1492 rt->server_type = RTSP_SERVER_WMS;
1493 } else if (rt->server_type == RTSP_SERVER_REAL)
1494 strcpy(real_challenge, reply->real_challenge);
1495 break;
1496 }
1497
1498 if (s->iformat)
1499 err = rtsp_setup_input_streams(s);
1500 else
1501 err = rtsp_setup_output_streams(s);
1502 if (err)
1503 goto fail;
1504
1505 do {
1506 int lower_transport = ff_log2_tab[lower_transport_mask &
1507 ~(lower_transport_mask - 1)];
1508
1509 err = make_setup_request(s, host, port, lower_transport,
1510 rt->server_type == RTSP_SERVER_REAL ?
1511 real_challenge : NULL);
1512 if (err < 0)
1513 goto fail;
1514 lower_transport_mask &= ~(1 << lower_transport);
1515 if (lower_transport_mask == 0 && err == 1) {
1516 err = AVERROR(FF_NETERROR(EPROTONOSUPPORT));
1517 goto fail;
1518 }
1519 } while (err);
1520
1521 rt->state = RTSP_STATE_IDLE;
1522 rt->seek_timestamp = 0; /* default is to start stream at position zero */
1523 return 0;
1524 fail:
1525 ff_rtsp_close_streams(s);
1526 url_close(rt->rtsp_hd);
1527 if (reply->status_code >=300 && reply->status_code < 400 && s->iformat) {
1528 av_strlcpy(s->filename, reply->location, sizeof(s->filename));
1529 av_log(s, AV_LOG_INFO, "Status %d: Redirecting to %s\n",
1530 reply->status_code,
1531 s->filename);
1532 goto redirect;
1533 }
1534 ff_network_close();
1535 return err;
1536 }
1537 #endif
1538
1539 #if CONFIG_RTSP_DEMUXER
1540 static int rtsp_read_header(AVFormatContext *s,
1541 AVFormatParameters *ap)
1542 {
1543 RTSPState *rt = s->priv_data;
1544 int ret;
1545
1546 ret = ff_rtsp_connect(s);
1547 if (ret)
1548 return ret;
1549
1550 if (ap->initial_pause) {
1551 /* do not start immediately */
1552 } else {
1553 if (rtsp_read_play(s) < 0) {
1554 ff_rtsp_close_streams(s);
1555 url_close(rt->rtsp_hd);
1556 return AVERROR_INVALIDDATA;
1557 }
1558 }
1559
1560 return 0;
1561 }
1562
1563 static int udp_read_packet(AVFormatContext *s, RTSPStream **prtsp_st,
1564 uint8_t *buf, int buf_size)
1565 {
1566 RTSPState *rt = s->priv_data;
1567 RTSPStream *rtsp_st;
1568 fd_set rfds;
1569 int fd, fd_max, n, i, ret, tcp_fd;
1570 struct timeval tv;
1571
1572 for (;;) {
1573 if (url_interrupt_cb())
1574 return AVERROR(EINTR);
1575 FD_ZERO(&rfds);
1576 if (rt->rtsp_hd) {
1577 tcp_fd = fd_max = url_get_file_handle(rt->rtsp_hd);
1578 FD_SET(tcp_fd, &rfds);
1579 } else {
1580 fd_max = 0;
1581 tcp_fd = -1;
1582 }
1583 for (i = 0; i < rt->nb_rtsp_streams; i++) {
1584 rtsp_st = rt->rtsp_streams[i];
1585 if (rtsp_st->rtp_handle) {
1586 /* currently, we cannot probe RTCP handle because of
1587 * blocking restrictions */
1588 fd = url_get_file_handle(rtsp_st->rtp_handle);
1589 if (fd > fd_max)
1590 fd_max = fd;
1591 FD_SET(fd, &rfds);
1592 }
1593 }
1594 tv.tv_sec = 0;
1595 tv.tv_usec = 100 * 1000;
1596 n = select(fd_max + 1, &rfds, NULL, NULL, &tv);
1597 if (n > 0) {
1598 for (i = 0; i < rt->nb_rtsp_streams; i++) {
1599 rtsp_st = rt->rtsp_streams[i];
1600 if (rtsp_st->rtp_handle) {
1601 fd = url_get_file_handle(rtsp_st->rtp_handle);
1602 if (FD_ISSET(fd, &rfds)) {
1603 ret = url_read(rtsp_st->rtp_handle, buf, buf_size);
1604 if (ret > 0) {
1605 *prtsp_st = rtsp_st;
1606 return ret;
1607 }
1608 }
1609 }
1610 }
1611 #if CONFIG_RTSP_DEMUXER
1612 if (tcp_fd != -1 && FD_ISSET(tcp_fd, &rfds)) {
1613 RTSPMessageHeader reply;
1614
1615 ff_rtsp_read_reply(s, &reply, NULL, 0);
1616 /* XXX: parse message */
1617 if (rt->state != RTSP_STATE_STREAMING)
1618 return 0;
1619 }
1620 #endif
1621 }
1622 }
1623 }
1624
1625 static int tcp_read_packet(AVFormatContext *s, RTSPStream **prtsp_st,
1626 uint8_t *buf, int buf_size)
1627 {
1628 RTSPState *rt = s->priv_data;
1629 int id, len, i, ret;
1630 RTSPStream *rtsp_st;
1631
1632 #ifdef DEBUG_RTP_TCP
1633 dprintf(s, "tcp_read_packet:\n");
1634 #endif
1635 redo:
1636 for (;;) {
1637 RTSPMessageHeader reply;
1638
1639 ret = ff_rtsp_read_reply(s, &reply, NULL, 1);
1640 if (ret == -1)
1641 return -1;
1642 if (ret == 1) /* received '$' */
1643 break;
1644 /* XXX: parse message */
1645 if (rt->state != RTSP_STATE_STREAMING)
1646 return 0;
1647 }
1648 ret = url_read_complete(rt->rtsp_hd, buf, 3);
1649 if (ret != 3)
1650 return -1;
1651 id = buf[0];
1652 len = AV_RB16(buf + 1);
1653 #ifdef DEBUG_RTP_TCP
1654 dprintf(s, "id=%d len=%d\n", id, len);
1655 #endif
1656 if (len > buf_size || len < 12)
1657 goto redo;
1658 /* get the data */
1659 ret = url_read_complete(rt->rtsp_hd, buf, len);
1660 if (ret != len)
1661 return -1;
1662 if (rt->transport == RTSP_TRANSPORT_RDT &&
1663 ff_rdt_parse_header(buf, len, &id, NULL, NULL, NULL, NULL) < 0)
1664 return -1;
1665
1666 /* find the matching stream */
1667 for (i = 0; i < rt->nb_rtsp_streams; i++) {
1668 rtsp_st = rt->rtsp_streams[i];
1669 if (id >= rtsp_st->interleaved_min &&
1670 id <= rtsp_st->interleaved_max)
1671 goto found;
1672 }
1673 goto redo;
1674 found:
1675 *prtsp_st = rtsp_st;
1676 return len;
1677 }
1678
1679 static int rtsp_fetch_packet(AVFormatContext *s, AVPacket *pkt)
1680 {
1681 RTSPState *rt = s->priv_data;
1682 int ret, len;
1683 uint8_t buf[10 * RTP_MAX_PACKET_LENGTH];
1684 RTSPStream *rtsp_st;
1685
1686 /* get next frames from the same RTP packet */
1687 if (rt->cur_transport_priv) {
1688 if (rt->transport == RTSP_TRANSPORT_RDT) {
1689 ret = ff_rdt_parse_packet(rt->cur_transport_priv, pkt, NULL, 0);
1690 } else
1691 ret = rtp_parse_packet(rt->cur_transport_priv, pkt, NULL, 0);
1692 if (ret == 0) {
1693 rt->cur_transport_priv = NULL;
1694 return 0;
1695 } else if (ret == 1) {
1696 return 0;
1697 } else
1698 rt->cur_transport_priv = NULL;
1699 }
1700
1701 /* read next RTP packet */
1702 redo:
1703 switch(rt->lower_transport) {
1704 default:
1705 #if CONFIG_RTSP_DEMUXER
1706 case RTSP_LOWER_TRANSPORT_TCP:
1707 len = tcp_read_packet(s, &rtsp_st, buf, sizeof(buf));
1708 break;
1709 #endif
1710 case RTSP_LOWER_TRANSPORT_UDP:
1711 case RTSP_LOWER_TRANSPORT_UDP_MULTICAST:
1712 len = udp_read_packet(s, &rtsp_st, buf, sizeof(buf));
1713 if (len >=0 && rtsp_st->transport_priv && rt->transport == RTSP_TRANSPORT_RTP)
1714 rtp_check_and_send_back_rr(rtsp_st->transport_priv, len);
1715 break;
1716 }
1717 if (len < 0)
1718 return len;
1719 if (len == 0)
1720 return AVERROR_EOF;
1721 if (rt->transport == RTSP_TRANSPORT_RDT) {
1722 ret = ff_rdt_parse_packet(rtsp_st->transport_priv, pkt, buf, len);
1723 } else
1724 ret = rtp_parse_packet(rtsp_st->transport_priv, pkt, buf, len);
1725 if (ret < 0)
1726 goto redo;
1727 if (ret == 1)
1728 /* more packets may follow, so we save the RTP context */
1729 rt->cur_transport_priv = rtsp_st->transport_priv;
1730
1731 return ret;
1732 }
1733
1734 static int rtsp_read_packet(AVFormatContext *s, AVPacket *pkt)
1735 {
1736 RTSPState *rt = s->priv_data;
1737 int ret;
1738 RTSPMessageHeader reply1, *reply = &reply1;
1739 char cmd[1024];
1740
1741 if (rt->server_type == RTSP_SERVER_REAL) {
1742 int i;
1743 enum AVDiscard cache[MAX_STREAMS];
1744
1745 for (i = 0; i < s->nb_streams; i++)
1746 cache[i] = s->streams[i]->discard;
1747
1748 if (!rt->need_subscription) {
1749 if (memcmp (cache, rt->real_setup_cache,
1750 sizeof(enum AVDiscard) * s->nb_streams)) {
1751 snprintf(cmd, sizeof(cmd),
1752 "SET_PARAMETER %s RTSP/1.0\r\n"
1753 "Unsubscribe: %s\r\n",
1754 rt->control_uri, rt->last_subscription);
1755 ff_rtsp_send_cmd(s, cmd, reply, NULL);
1756 if (reply->status_code != RTSP_STATUS_OK)
1757 return AVERROR_INVALIDDATA;
1758 rt->need_subscription = 1;
1759 }
1760 }
1761
1762 if (rt->need_subscription) {
1763 int r, rule_nr, first = 1;
1764
1765 memcpy(rt->real_setup_cache, cache,
1766 sizeof(enum AVDiscard) * s->nb_streams);
1767 rt->last_subscription[0] = 0;
1768
1769 snprintf(cmd, sizeof(cmd),
1770 "SET_PARAMETER %s RTSP/1.0\r\n"
1771 "Subscribe: ",
1772 rt->control_uri);
1773 for (i = 0; i < rt->nb_rtsp_streams; i++) {
1774 rule_nr = 0;
1775 for (r = 0; r < s->nb_streams; r++) {
1776 if (s->streams[r]->priv_data == rt->rtsp_streams[i]) {
1777 if (s->streams[r]->discard != AVDISCARD_ALL) {
1778 if (!first)
1779 av_strlcat(rt->last_subscription, ",",
1780 sizeof(rt->last_subscription));
1781 ff_rdt_subscribe_rule(
1782 rt->last_subscription,
1783 sizeof(rt->last_subscription), i, rule_nr);
1784 first = 0;
1785 }
1786 rule_nr++;
1787 }
1788 }
1789 }
1790 av_strlcatf(cmd, sizeof(cmd), "%s\r\n", rt->last_subscription);
1791 ff_rtsp_send_cmd(s, cmd, reply, NULL);
1792 if (reply->status_code != RTSP_STATUS_OK)
1793 return AVERROR_INVALIDDATA;
1794 rt->need_subscription = 0;
1795
1796 if (rt->state == RTSP_STATE_STREAMING)
1797 rtsp_read_play (s);
1798 }
1799 }
1800
1801 ret = rtsp_fetch_packet(s, pkt);
1802 if (ret < 0)
1803 return ret;
1804
1805 /* send dummy request to keep TCP connection alive */
1806 if ((rt->server_type == RTSP_SERVER_WMS ||
1807 rt->server_type == RTSP_SERVER_REAL) &&
1808 (av_gettime() - rt->last_cmd_time) / 1000000 >= rt->timeout / 2) {
1809 if (rt->server_type == RTSP_SERVER_WMS) {
1810 snprintf(cmd, sizeof(cmd) - 1,
1811 "GET_PARAMETER %s RTSP/1.0\r\n",
1812 rt->control_uri);
1813 ff_rtsp_send_cmd_async(s, cmd);
1814 } else {
1815 ff_rtsp_send_cmd_async(s, "OPTIONS * RTSP/1.0\r\n");
1816 }
1817 }
1818
1819 return 0;
1820 }
1821
1822 /* pause the stream */
1823 static int rtsp_read_pause(AVFormatContext *s)
1824 {
1825 RTSPState *rt = s->priv_data;
1826 RTSPMessageHeader reply1, *reply = &reply1;
1827 char cmd[1024];
1828
1829 rt = s->priv_data;
1830
1831 if (rt->state != RTSP_STATE_STREAMING)
1832 return 0;
1833 else if (!(rt->server_type == RTSP_SERVER_REAL && rt->need_subscription)) {
1834 snprintf(cmd, sizeof(cmd),
1835 "PAUSE %s RTSP/1.0\r\n",
1836 rt->control_uri);
1837 ff_rtsp_send_cmd(s, cmd, reply, NULL);
1838 if (reply->status_code != RTSP_STATUS_OK) {
1839 return -1;
1840 }
1841 }
1842 rt->state = RTSP_STATE_PAUSED;
1843 return 0;
1844 }
1845
1846 static int rtsp_read_seek(AVFormatContext *s, int stream_index,
1847 int64_t timestamp, int flags)
1848 {
1849 RTSPState *rt = s->priv_data;
1850
1851 rt->seek_timestamp = av_rescale_q(timestamp,
1852 s->streams[stream_index]->time_base,
1853 AV_TIME_BASE_Q);
1854 switch(rt->state) {
1855 default:
1856 case RTSP_STATE_IDLE:
1857 break;
1858 case RTSP_STATE_STREAMING:
1859 if (rtsp_read_pause(s) != 0)
1860 return -1;
1861 rt->state = RTSP_STATE_SEEKING;
1862 if (rtsp_read_play(s) != 0)
1863 return -1;
1864 break;
1865 case RTSP_STATE_PAUSED:
1866 rt->state = RTSP_STATE_IDLE;
1867 break;
1868 }
1869 return 0;
1870 }
1871
1872 static int rtsp_read_close(AVFormatContext *s)
1873 {
1874 RTSPState *rt = s->priv_data;
1875 char cmd[1024];
1876
1877 #if 0
1878 /* NOTE: it is valid to flush the buffer here */
1879 if (rt->lower_transport == RTSP_LOWER_TRANSPORT_TCP) {
1880 url_fclose(&rt->rtsp_gb);
1881 }
1882 #endif
1883 snprintf(cmd, sizeof(cmd),
1884 "TEARDOWN %s RTSP/1.0\r\n",
1885 s->filename);
1886 ff_rtsp_send_cmd_async(s, cmd);
1887
1888 ff_rtsp_close_streams(s);
1889 url_close(rt->rtsp_hd);
1890 ff_network_close();
1891 return 0;
1892 }
1893
1894 AVInputFormat rtsp_demuxer = {
1895 "rtsp",
1896 NULL_IF_CONFIG_SMALL("RTSP input format"),
1897 sizeof(RTSPState),
1898 rtsp_probe,
1899 rtsp_read_header,
1900 rtsp_read_packet,
1901 rtsp_read_close,
1902 rtsp_read_seek,
1903 .flags = AVFMT_NOFILE,
1904 .read_play = rtsp_read_play,
1905 .read_pause = rtsp_read_pause,
1906 };
1907 #endif
1908
1909 static int sdp_probe(AVProbeData *p1)
1910 {
1911 const char *p = p1->buf, *p_end = p1->buf + p1->buf_size;
1912
1913 /* we look for a line beginning "c=IN IP4" */
1914 while (p < p_end && *p != '\0') {
1915 if (p + sizeof("c=IN IP4") - 1 < p_end &&
1916 av_strstart(p, "c=IN IP4", NULL))
1917 return AVPROBE_SCORE_MAX / 2;
1918
1919 while (p < p_end - 1 && *p != '\n') p++;
1920 if (++p >= p_end)
1921 break;
1922 if (*p == '\r')
1923 p++;
1924 }
1925 return 0;
1926 }
1927
1928 #define SDP_MAX_SIZE 8192
1929
1930 static int sdp_read_header(AVFormatContext *s, AVFormatParameters *ap)
1931 {
1932 RTSPState *rt = s->priv_data;
1933 RTSPStream *rtsp_st;
1934 int size, i, err;
1935 char *content;
1936 char url[1024];
1937
1938 if (!ff_network_init())
1939 return AVERROR(EIO);
1940
1941 /* read the whole sdp file */
1942 /* XXX: better loading */
1943 content = av_malloc(SDP_MAX_SIZE);
1944 size = get_buffer(s->pb, content, SDP_MAX_SIZE - 1);
1945 if (size <= 0) {
1946 av_free(content);
1947 return AVERROR_INVALIDDATA;
1948 }
1949 content[size] ='\0';
1950
1951 sdp_parse(s, content);
1952 av_free(content);
1953
1954 /* open each RTP stream */
1955 for (i = 0; i < rt->nb_rtsp_streams; i++) {
1956 rtsp_st = rt->rtsp_streams[i];
1957
1958 ff_url_join(url, sizeof(url), "rtp", NULL,
1959 inet_ntoa(rtsp_st->sdp_ip), rtsp_st->sdp_port,
1960 "?localport=%d&ttl=%d", rtsp_st->sdp_port,
1961 rtsp_st->sdp_ttl);
1962 if (url_open(&rtsp_st->rtp_handle, url, URL_RDWR) < 0) {
1963 err = AVERROR_INVALIDDATA;
1964 goto fail;
1965 }
1966 if ((err = rtsp_open_transport_ctx(s, rtsp_st)))
1967 goto fail;
1968 }
1969 return 0;
1970 fail:
1971 ff_rtsp_close_streams(s);
1972 ff_network_close();
1973 return err;
1974 }
1975
1976 static int sdp_read_close(AVFormatContext *s)
1977 {
1978 ff_rtsp_close_streams(s);
1979 ff_network_close();
1980 return 0;
1981 }
1982
1983 AVInputFormat sdp_demuxer = {
1984 "sdp",
1985 NULL_IF_CONFIG_SMALL("SDP"),
1986 sizeof(RTSPState),
1987 sdp_probe,
1988 sdp_read_header,
1989 rtsp_fetch_packet,
1990 sdp_read_close,
1991 };