Add an RTSP muxer
[libav.git] / libavformat / rtsp.c
1 /*
2 * RTSP/SDP client
3 * Copyright (c) 2002 Fabrice Bellard
4 *
5 * This file is part of FFmpeg.
6 *
7 * FFmpeg is free software; you can redistribute it and/or
8 * modify it under the terms of the GNU Lesser General Public
9 * License as published by the Free Software Foundation; either
10 * version 2.1 of the License, or (at your option) any later version.
11 *
12 * FFmpeg is distributed in the hope that it will be useful,
13 * but WITHOUT ANY WARRANTY; without even the implied warranty of
14 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
15 * Lesser General Public License for more details.
16 *
17 * You should have received a copy of the GNU Lesser General Public
18 * License along with FFmpeg; if not, write to the Free Software
19 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
20 */
21
22 /* needed by inet_aton() */
23 #define _SVID_SOURCE
24
25 #include "libavutil/base64.h"
26 #include "libavutil/avstring.h"
27 #include "libavutil/intreadwrite.h"
28 #include "avformat.h"
29
30 #include <sys/time.h>
31 #if HAVE_SYS_SELECT_H
32 #include <sys/select.h>
33 #endif
34 #include <strings.h>
35 #include "network.h"
36 #include "rtsp.h"
37
38 #include "rtpdec.h"
39 #include "rdt.h"
40 #include "rtp_asf.h"
41 #include "rtp_vorbis.h"
42
43 //#define DEBUG
44 //#define DEBUG_RTP_TCP
45
46 #if LIBAVFORMAT_VERSION_INT < (53 << 16)
47 int rtsp_default_protocols = (1 << RTSP_LOWER_TRANSPORT_UDP);
48 #endif
49
50 #define SPACE_CHARS " \t\r\n"
51 /* we use memchr() instead of strchr() here because strchr() will return
52 * the terminating '\0' of SPACE_CHARS instead of NULL if c is '\0'. */
53 #define redir_isspace(c) memchr(SPACE_CHARS, c, 4)
54 static void skip_spaces(const char **pp)
55 {
56 const char *p;
57 p = *pp;
58 while (redir_isspace(*p))
59 p++;
60 *pp = p;
61 }
62
63 static void get_word_until_chars(char *buf, int buf_size,
64 const char *sep, const char **pp)
65 {
66 const char *p;
67 char *q;
68
69 p = *pp;
70 skip_spaces(&p);
71 q = buf;
72 while (!strchr(sep, *p) && *p != '\0') {
73 if ((q - buf) < buf_size - 1)
74 *q++ = *p;
75 p++;
76 }
77 if (buf_size > 0)
78 *q = '\0';
79 *pp = p;
80 }
81
82 static void get_word_sep(char *buf, int buf_size, const char *sep,
83 const char **pp)
84 {
85 if (**pp == '/') (*pp)++;
86 get_word_until_chars(buf, buf_size, sep, pp);
87 }
88
89 static void get_word(char *buf, int buf_size, const char **pp)
90 {
91 get_word_until_chars(buf, buf_size, SPACE_CHARS, pp);
92 }
93
94 /* parse the rtpmap description: <codec_name>/<clock_rate>[/<other params>] */
95 static int sdp_parse_rtpmap(AVFormatContext *s,
96 AVCodecContext *codec, RTSPStream *rtsp_st,
97 int payload_type, const char *p)
98 {
99 char buf[256];
100 int i;
101 AVCodec *c;
102 const char *c_name;
103
104 /* Loop into AVRtpDynamicPayloadTypes[] and AVRtpPayloadTypes[] and
105 * see if we can handle this kind of payload.
106 * The space should normally not be there but some Real streams or
107 * particular servers ("RealServer Version 6.1.3.970", see issue 1658)
108 * have a trailing space. */
109 get_word_sep(buf, sizeof(buf), "/ ", &p);
110 if (payload_type >= RTP_PT_PRIVATE) {
111 RTPDynamicProtocolHandler *handler;
112 for (handler = RTPFirstDynamicPayloadHandler;
113 handler; handler = handler->next) {
114 if (!strcasecmp(buf, handler->enc_name) &&
115 codec->codec_type == handler->codec_type) {
116 codec->codec_id = handler->codec_id;
117 rtsp_st->dynamic_handler = handler;
118 if (handler->open)
119 rtsp_st->dynamic_protocol_context = handler->open();
120 break;
121 }
122 }
123 } else {
124 /* We are in a standard case
125 * (from http://www.iana.org/assignments/rtp-parameters). */
126 /* search into AVRtpPayloadTypes[] */
127 codec->codec_id = ff_rtp_codec_id(buf, codec->codec_type);
128 }
129
130 c = avcodec_find_decoder(codec->codec_id);
131 if (c && c->name)
132 c_name = c->name;
133 else
134 c_name = "(null)";
135
136 get_word_sep(buf, sizeof(buf), "/", &p);
137 i = atoi(buf);
138 switch (codec->codec_type) {
139 case CODEC_TYPE_AUDIO:
140 av_log(s, AV_LOG_DEBUG, "audio codec set to: %s\n", c_name);
141 codec->sample_rate = RTSP_DEFAULT_AUDIO_SAMPLERATE;
142 codec->channels = RTSP_DEFAULT_NB_AUDIO_CHANNELS;
143 if (i > 0) {
144 codec->sample_rate = i;
145 get_word_sep(buf, sizeof(buf), "/", &p);
146 i = atoi(buf);
147 if (i > 0)
148 codec->channels = i;
149 // TODO: there is a bug here; if it is a mono stream, and
150 // less than 22000Hz, faad upconverts to stereo and twice
151 // the frequency. No problem, but the sample rate is being
152 // set here by the sdp line. Patch on its way. (rdm)
153 }
154 av_log(s, AV_LOG_DEBUG, "audio samplerate set to: %i\n",
155 codec->sample_rate);
156 av_log(s, AV_LOG_DEBUG, "audio channels set to: %i\n",
157 codec->channels);
158 break;
159 case CODEC_TYPE_VIDEO:
160 av_log(s, AV_LOG_DEBUG, "video codec set to: %s\n", c_name);
161 break;
162 default:
163 break;
164 }
165 return 0;
166 }
167
168 /* return the length and optionally the data */
169 static int hex_to_data(uint8_t *data, const char *p)
170 {
171 int c, len, v;
172
173 len = 0;
174 v = 1;
175 for (;;) {
176 skip_spaces(&p);
177 if (*p == '\0')
178 break;
179 c = toupper((unsigned char) *p++);
180 if (c >= '0' && c <= '9')
181 c = c - '0';
182 else if (c >= 'A' && c <= 'F')
183 c = c - 'A' + 10;
184 else
185 break;
186 v = (v << 4) | c;
187 if (v & 0x100) {
188 if (data)
189 data[len] = v;
190 len++;
191 v = 1;
192 }
193 }
194 return len;
195 }
196
197 static void sdp_parse_fmtp_config(AVCodecContext * codec, void *ctx,
198 char *attr, char *value)
199 {
200 switch (codec->codec_id) {
201 case CODEC_ID_MPEG4:
202 case CODEC_ID_AAC:
203 if (!strcmp(attr, "config")) {
204 /* decode the hexa encoded parameter */
205 int len = hex_to_data(NULL, value);
206 if (codec->extradata)
207 av_free(codec->extradata);
208 codec->extradata = av_mallocz(len + FF_INPUT_BUFFER_PADDING_SIZE);
209 if (!codec->extradata)
210 return;
211 codec->extradata_size = len;
212 hex_to_data(codec->extradata, value);
213 }
214 break;
215 case CODEC_ID_VORBIS:
216 ff_vorbis_parse_fmtp_config(codec, ctx, attr, value);
217 break;
218 default:
219 break;
220 }
221 return;
222 }
223
224 typedef struct {
225 const char *str;
226 uint16_t type;
227 uint32_t offset;
228 } AttrNameMap;
229
230 /* All known fmtp parmeters and the corresping RTPAttrTypeEnum */
231 #define ATTR_NAME_TYPE_INT 0
232 #define ATTR_NAME_TYPE_STR 1
233 static const AttrNameMap attr_names[]=
234 {
235 { "SizeLength", ATTR_NAME_TYPE_INT,
236 offsetof(RTPPayloadData, sizelength) },
237 { "IndexLength", ATTR_NAME_TYPE_INT,
238 offsetof(RTPPayloadData, indexlength) },
239 { "IndexDeltaLength", ATTR_NAME_TYPE_INT,
240 offsetof(RTPPayloadData, indexdeltalength) },
241 { "profile-level-id", ATTR_NAME_TYPE_INT,
242 offsetof(RTPPayloadData, profile_level_id) },
243 { "StreamType", ATTR_NAME_TYPE_INT,
244 offsetof(RTPPayloadData, streamtype) },
245 { "mode", ATTR_NAME_TYPE_STR,
246 offsetof(RTPPayloadData, mode) },
247 { NULL, -1, -1 },
248 };
249
250 /* parse the attribute line from the fmtp a line of an sdp resonse. This
251 * is broken out as a function because it is used in rtp_h264.c, which is
252 * forthcoming. */
253 int rtsp_next_attr_and_value(const char **p, char *attr, int attr_size,
254 char *value, int value_size)
255 {
256 skip_spaces(p);
257 if (**p) {
258 get_word_sep(attr, attr_size, "=", p);
259 if (**p == '=')
260 (*p)++;
261 get_word_sep(value, value_size, ";", p);
262 if (**p == ';')
263 (*p)++;
264 return 1;
265 }
266 return 0;
267 }
268
269 /* parse a SDP line and save stream attributes */
270 static void sdp_parse_fmtp(AVStream *st, const char *p)
271 {
272 char attr[256];
273 /* Vorbis setup headers can be up to 12KB and are sent base64
274 * encoded, giving a 12KB * (4/3) = 16KB FMTP line. */
275 char value[16384];
276 int i;
277 RTSPStream *rtsp_st = st->priv_data;
278 AVCodecContext *codec = st->codec;
279 RTPPayloadData *rtp_payload_data = &rtsp_st->rtp_payload_data;
280
281 /* loop on each attribute */
282 while (rtsp_next_attr_and_value(&p, attr, sizeof(attr),
283 value, sizeof(value))) {
284 /* grab the codec extra_data from the config parameter of the fmtp
285 * line */
286 sdp_parse_fmtp_config(codec, rtsp_st->dynamic_protocol_context,
287 attr, value);
288 /* Looking for a known attribute */
289 for (i = 0; attr_names[i].str; ++i) {
290 if (!strcasecmp(attr, attr_names[i].str)) {
291 if (attr_names[i].type == ATTR_NAME_TYPE_INT) {
292 *(int *)((char *)rtp_payload_data +
293 attr_names[i].offset) = atoi(value);
294 } else if (attr_names[i].type == ATTR_NAME_TYPE_STR)
295 *(char **)((char *)rtp_payload_data +
296 attr_names[i].offset) = av_strdup(value);
297 }
298 }
299 }
300 }
301
302 /** Parse a string p in the form of Range:npt=xx-xx, and determine the start
303 * and end time.
304 * Used for seeking in the rtp stream.
305 */
306 static void rtsp_parse_range_npt(const char *p, int64_t *start, int64_t *end)
307 {
308 char buf[256];
309
310 skip_spaces(&p);
311 if (!av_stristart(p, "npt=", &p))
312 return;
313
314 *start = AV_NOPTS_VALUE;
315 *end = AV_NOPTS_VALUE;
316
317 get_word_sep(buf, sizeof(buf), "-", &p);
318 *start = parse_date(buf, 1);
319 if (*p == '-') {
320 p++;
321 get_word_sep(buf, sizeof(buf), "-", &p);
322 *end = parse_date(buf, 1);
323 }
324 // av_log(NULL, AV_LOG_DEBUG, "Range Start: %lld\n", *start);
325 // av_log(NULL, AV_LOG_DEBUG, "Range End: %lld\n", *end);
326 }
327
328 typedef struct SDPParseState {
329 /* SDP only */
330 struct in_addr default_ip;
331 int default_ttl;
332 int skip_media; ///< set if an unknown m= line occurs
333 } SDPParseState;
334
335 static void sdp_parse_line(AVFormatContext *s, SDPParseState *s1,
336 int letter, const char *buf)
337 {
338 RTSPState *rt = s->priv_data;
339 char buf1[64], st_type[64];
340 const char *p;
341 enum CodecType codec_type;
342 int payload_type, i;
343 AVStream *st;
344 RTSPStream *rtsp_st;
345 struct in_addr sdp_ip;
346 int ttl;
347
348 dprintf(s, "sdp: %c='%s'\n", letter, buf);
349
350 p = buf;
351 if (s1->skip_media && letter != 'm')
352 return;
353 switch (letter) {
354 case 'c':
355 get_word(buf1, sizeof(buf1), &p);
356 if (strcmp(buf1, "IN") != 0)
357 return;
358 get_word(buf1, sizeof(buf1), &p);
359 if (strcmp(buf1, "IP4") != 0)
360 return;
361 get_word_sep(buf1, sizeof(buf1), "/", &p);
362 if (inet_aton(buf1, &sdp_ip) == 0)
363 return;
364 ttl = 16;
365 if (*p == '/') {
366 p++;
367 get_word_sep(buf1, sizeof(buf1), "/", &p);
368 ttl = atoi(buf1);
369 }
370 if (s->nb_streams == 0) {
371 s1->default_ip = sdp_ip;
372 s1->default_ttl = ttl;
373 } else {
374 st = s->streams[s->nb_streams - 1];
375 rtsp_st = st->priv_data;
376 rtsp_st->sdp_ip = sdp_ip;
377 rtsp_st->sdp_ttl = ttl;
378 }
379 break;
380 case 's':
381 av_metadata_set(&s->metadata, "title", p);
382 break;
383 case 'i':
384 if (s->nb_streams == 0) {
385 av_metadata_set(&s->metadata, "comment", p);
386 break;
387 }
388 break;
389 case 'm':
390 /* new stream */
391 s1->skip_media = 0;
392 get_word(st_type, sizeof(st_type), &p);
393 if (!strcmp(st_type, "audio")) {
394 codec_type = CODEC_TYPE_AUDIO;
395 } else if (!strcmp(st_type, "video")) {
396 codec_type = CODEC_TYPE_VIDEO;
397 } else if (!strcmp(st_type, "application")) {
398 codec_type = CODEC_TYPE_DATA;
399 } else {
400 s1->skip_media = 1;
401 return;
402 }
403 rtsp_st = av_mallocz(sizeof(RTSPStream));
404 if (!rtsp_st)
405 return;
406 rtsp_st->stream_index = -1;
407 dynarray_add(&rt->rtsp_streams, &rt->nb_rtsp_streams, rtsp_st);
408
409 rtsp_st->sdp_ip = s1->default_ip;
410 rtsp_st->sdp_ttl = s1->default_ttl;
411
412 get_word(buf1, sizeof(buf1), &p); /* port */
413 rtsp_st->sdp_port = atoi(buf1);
414
415 get_word(buf1, sizeof(buf1), &p); /* protocol (ignored) */
416
417 /* XXX: handle list of formats */
418 get_word(buf1, sizeof(buf1), &p); /* format list */
419 rtsp_st->sdp_payload_type = atoi(buf1);
420
421 if (!strcmp(ff_rtp_enc_name(rtsp_st->sdp_payload_type), "MP2T")) {
422 /* no corresponding stream */
423 } else {
424 st = av_new_stream(s, 0);
425 if (!st)
426 return;
427 st->priv_data = rtsp_st;
428 rtsp_st->stream_index = st->index;
429 st->codec->codec_type = codec_type;
430 if (rtsp_st->sdp_payload_type < RTP_PT_PRIVATE) {
431 /* if standard payload type, we can find the codec right now */
432 ff_rtp_get_codec_info(st->codec, rtsp_st->sdp_payload_type);
433 }
434 }
435 /* put a default control url */
436 av_strlcpy(rtsp_st->control_url, rt->control_uri,
437 sizeof(rtsp_st->control_url));
438 break;
439 case 'a':
440 if (av_strstart(p, "control:", &p)) {
441 if (s->nb_streams == 0) {
442 if (!strncmp(p, "rtsp://", 7))
443 av_strlcpy(rt->control_uri, p,
444 sizeof(rt->control_uri));
445 } else {
446 char proto[32];
447 /* get the control url */
448 st = s->streams[s->nb_streams - 1];
449 rtsp_st = st->priv_data;
450
451 /* XXX: may need to add full url resolution */
452 url_split(proto, sizeof(proto), NULL, 0, NULL, 0,
453 NULL, NULL, 0, p);
454 if (proto[0] == '\0') {
455 /* relative control URL */
456 if (rtsp_st->control_url[strlen(rtsp_st->control_url)-1]!='/')
457 av_strlcat(rtsp_st->control_url, "/",
458 sizeof(rtsp_st->control_url));
459 av_strlcat(rtsp_st->control_url, p,
460 sizeof(rtsp_st->control_url));
461 } else
462 av_strlcpy(rtsp_st->control_url, p,
463 sizeof(rtsp_st->control_url));
464 }
465 } else if (av_strstart(p, "rtpmap:", &p) && s->nb_streams > 0) {
466 /* NOTE: rtpmap is only supported AFTER the 'm=' tag */
467 get_word(buf1, sizeof(buf1), &p);
468 payload_type = atoi(buf1);
469 st = s->streams[s->nb_streams - 1];
470 rtsp_st = st->priv_data;
471 sdp_parse_rtpmap(s, st->codec, rtsp_st, payload_type, p);
472 } else if (av_strstart(p, "fmtp:", &p)) {
473 /* NOTE: fmtp is only supported AFTER the 'a=rtpmap:xxx' tag */
474 get_word(buf1, sizeof(buf1), &p);
475 payload_type = atoi(buf1);
476 for (i = 0; i < s->nb_streams; i++) {
477 st = s->streams[i];
478 rtsp_st = st->priv_data;
479 if (rtsp_st->sdp_payload_type == payload_type) {
480 if (!(rtsp_st->dynamic_handler &&
481 rtsp_st->dynamic_handler->parse_sdp_a_line &&
482 rtsp_st->dynamic_handler->parse_sdp_a_line(s,
483 i, rtsp_st->dynamic_protocol_context, buf)))
484 sdp_parse_fmtp(st, p);
485 }
486 }
487 } else if (av_strstart(p, "framesize:", &p)) {
488 // let dynamic protocol handlers have a stab at the line.
489 get_word(buf1, sizeof(buf1), &p);
490 payload_type = atoi(buf1);
491 for (i = 0; i < s->nb_streams; i++) {
492 st = s->streams[i];
493 rtsp_st = st->priv_data;
494 if (rtsp_st->sdp_payload_type == payload_type &&
495 rtsp_st->dynamic_handler &&
496 rtsp_st->dynamic_handler->parse_sdp_a_line)
497 rtsp_st->dynamic_handler->parse_sdp_a_line(s, i,
498 rtsp_st->dynamic_protocol_context, buf);
499 }
500 } else if (av_strstart(p, "range:", &p)) {
501 int64_t start, end;
502
503 // this is so that seeking on a streamed file can work.
504 rtsp_parse_range_npt(p, &start, &end);
505 s->start_time = start;
506 /* AV_NOPTS_VALUE means live broadcast (and can't seek) */
507 s->duration = (end == AV_NOPTS_VALUE) ?
508 AV_NOPTS_VALUE : end - start;
509 } else if (av_strstart(p, "IsRealDataType:integer;",&p)) {
510 if (atoi(p) == 1)
511 rt->transport = RTSP_TRANSPORT_RDT;
512 } else {
513 if (rt->server_type == RTSP_SERVER_WMS)
514 ff_wms_parse_sdp_a_line(s, p);
515 if (s->nb_streams > 0) {
516 if (rt->server_type == RTSP_SERVER_REAL)
517 ff_real_parse_sdp_a_line(s, s->nb_streams - 1, p);
518
519 rtsp_st = s->streams[s->nb_streams - 1]->priv_data;
520 if (rtsp_st->dynamic_handler &&
521 rtsp_st->dynamic_handler->parse_sdp_a_line)
522 rtsp_st->dynamic_handler->parse_sdp_a_line(s,
523 s->nb_streams - 1,
524 rtsp_st->dynamic_protocol_context, buf);
525 }
526 }
527 break;
528 }
529 }
530
531 static int sdp_parse(AVFormatContext *s, const char *content)
532 {
533 const char *p;
534 int letter;
535 /* Some SDP lines, particularly for Realmedia or ASF RTSP streams,
536 * contain long SDP lines containing complete ASF Headers (several
537 * kB) or arrays of MDPR (RM stream descriptor) headers plus
538 * "rulebooks" describing their properties. Therefore, the SDP line
539 * buffer is large.
540 *
541 * The Vorbis FMTP line can be up to 16KB - see sdp_parse_fmtp. */
542 char buf[16384], *q;
543 SDPParseState sdp_parse_state, *s1 = &sdp_parse_state;
544
545 memset(s1, 0, sizeof(SDPParseState));
546 p = content;
547 for (;;) {
548 skip_spaces(&p);
549 letter = *p;
550 if (letter == '\0')
551 break;
552 p++;
553 if (*p != '=')
554 goto next_line;
555 p++;
556 /* get the content */
557 q = buf;
558 while (*p != '\n' && *p != '\r' && *p != '\0') {
559 if ((q - buf) < sizeof(buf) - 1)
560 *q++ = *p;
561 p++;
562 }
563 *q = '\0';
564 sdp_parse_line(s, s1, letter, buf);
565 next_line:
566 while (*p != '\n' && *p != '\0')
567 p++;
568 if (*p == '\n')
569 p++;
570 }
571 return 0;
572 }
573
574 /* close and free RTSP streams */
575 void rtsp_close_streams(AVFormatContext *s)
576 {
577 RTSPState *rt = s->priv_data;
578 int i;
579 RTSPStream *rtsp_st;
580
581 for (i = 0; i < rt->nb_rtsp_streams; i++) {
582 rtsp_st = rt->rtsp_streams[i];
583 if (rtsp_st) {
584 if (rtsp_st->transport_priv) {
585 if (s->oformat) {
586 AVFormatContext *rtpctx = rtsp_st->transport_priv;
587 av_write_trailer(rtpctx);
588 url_fclose(rtpctx->pb);
589 av_metadata_free(&rtpctx->streams[0]->metadata);
590 av_metadata_free(&rtpctx->metadata);
591 av_free(rtpctx->streams[0]);
592 av_free(rtpctx);
593 } else if (rt->transport == RTSP_TRANSPORT_RDT)
594 ff_rdt_parse_close(rtsp_st->transport_priv);
595 else
596 rtp_parse_close(rtsp_st->transport_priv);
597 }
598 if (rtsp_st->rtp_handle)
599 url_close(rtsp_st->rtp_handle);
600 if (rtsp_st->dynamic_handler && rtsp_st->dynamic_protocol_context)
601 rtsp_st->dynamic_handler->close(
602 rtsp_st->dynamic_protocol_context);
603 }
604 }
605 av_free(rt->rtsp_streams);
606 if (rt->asf_ctx) {
607 av_close_input_stream (rt->asf_ctx);
608 rt->asf_ctx = NULL;
609 }
610 av_freep(&rt->auth_b64);
611 }
612
613 static void *rtsp_rtp_mux_open(AVFormatContext *s, AVStream *st, URLContext *handle) {
614 AVFormatContext *rtpctx;
615 int ret;
616 AVOutputFormat *rtp_format = av_guess_format("rtp", NULL, NULL);
617
618 if (!rtp_format)
619 return NULL;
620
621 /* Allocate an AVFormatContext for each output stream */
622 rtpctx = avformat_alloc_context();
623 if (!rtpctx)
624 return NULL;
625
626 rtpctx->oformat = rtp_format;
627 if (!av_new_stream(rtpctx, 0)) {
628 av_free(rtpctx);
629 return NULL;
630 }
631 /* Copy the max delay setting; the rtp muxer reads this. */
632 rtpctx->max_delay = s->max_delay;
633 /* Copy other stream parameters. */
634 rtpctx->streams[0]->sample_aspect_ratio = st->sample_aspect_ratio;
635
636 /* Remove the local codec, link to the original codec
637 * context instead, to give the rtp muxer access to
638 * codec parameters. */
639 av_free(rtpctx->streams[0]->codec);
640 rtpctx->streams[0]->codec = st->codec;
641
642 url_fdopen(&rtpctx->pb, handle);
643 ret = av_write_header(rtpctx);
644
645 if (ret) {
646 url_fclose(rtpctx->pb);
647 av_free(rtpctx->streams[0]);
648 av_free(rtpctx);
649 return NULL;
650 }
651
652 /* Copy the RTP AVStream timebase back to the original AVStream */
653 st->time_base = rtpctx->streams[0]->time_base;
654 return rtpctx;
655 }
656
657 static int rtsp_open_transport_ctx(AVFormatContext *s, RTSPStream *rtsp_st)
658 {
659 RTSPState *rt = s->priv_data;
660 AVStream *st = NULL;
661
662 /* open the RTP context */
663 if (rtsp_st->stream_index >= 0)
664 st = s->streams[rtsp_st->stream_index];
665 if (!st)
666 s->ctx_flags |= AVFMTCTX_NOHEADER;
667
668 if (s->oformat) {
669 rtsp_st->transport_priv = rtsp_rtp_mux_open(s, st, rtsp_st->rtp_handle);
670 /* Ownage of rtp_handle is passed to the rtp mux context */
671 rtsp_st->rtp_handle = NULL;
672 } else if (rt->transport == RTSP_TRANSPORT_RDT)
673 rtsp_st->transport_priv = ff_rdt_parse_open(s, st->index,
674 rtsp_st->dynamic_protocol_context,
675 rtsp_st->dynamic_handler);
676 else
677 rtsp_st->transport_priv = rtp_parse_open(s, st, rtsp_st->rtp_handle,
678 rtsp_st->sdp_payload_type,
679 &rtsp_st->rtp_payload_data);
680
681 if (!rtsp_st->transport_priv) {
682 return AVERROR(ENOMEM);
683 } else if (rt->transport != RTSP_TRANSPORT_RDT) {
684 if (rtsp_st->dynamic_handler) {
685 rtp_parse_set_dynamic_protocol(rtsp_st->transport_priv,
686 rtsp_st->dynamic_protocol_context,
687 rtsp_st->dynamic_handler);
688 }
689 }
690
691 return 0;
692 }
693
694 #if CONFIG_RTSP_DEMUXER || CONFIG_RTSP_MUXER
695 static int rtsp_probe(AVProbeData *p)
696 {
697 if (av_strstart(p->filename, "rtsp:", NULL))
698 return AVPROBE_SCORE_MAX;
699 return 0;
700 }
701
702 static void rtsp_parse_range(int *min_ptr, int *max_ptr, const char **pp)
703 {
704 const char *p;
705 int v;
706
707 p = *pp;
708 skip_spaces(&p);
709 v = strtol(p, (char **)&p, 10);
710 if (*p == '-') {
711 p++;
712 *min_ptr = v;
713 v = strtol(p, (char **)&p, 10);
714 *max_ptr = v;
715 } else {
716 *min_ptr = v;
717 *max_ptr = v;
718 }
719 *pp = p;
720 }
721
722 /* XXX: only one transport specification is parsed */
723 static void rtsp_parse_transport(RTSPMessageHeader *reply, const char *p)
724 {
725 char transport_protocol[16];
726 char profile[16];
727 char lower_transport[16];
728 char parameter[16];
729 RTSPTransportField *th;
730 char buf[256];
731
732 reply->nb_transports = 0;
733
734 for (;;) {
735 skip_spaces(&p);
736 if (*p == '\0')
737 break;
738
739 th = &reply->transports[reply->nb_transports];
740
741 get_word_sep(transport_protocol, sizeof(transport_protocol),
742 "/", &p);
743 if (!strcasecmp (transport_protocol, "rtp")) {
744 get_word_sep(profile, sizeof(profile), "/;,", &p);
745 lower_transport[0] = '\0';
746 /* rtp/avp/<protocol> */
747 if (*p == '/') {
748 get_word_sep(lower_transport, sizeof(lower_transport),
749 ";,", &p);
750 }
751 th->transport = RTSP_TRANSPORT_RTP;
752 } else if (!strcasecmp (transport_protocol, "x-pn-tng") ||
753 !strcasecmp (transport_protocol, "x-real-rdt")) {
754 /* x-pn-tng/<protocol> */
755 get_word_sep(lower_transport, sizeof(lower_transport), "/;,", &p);
756 profile[0] = '\0';
757 th->transport = RTSP_TRANSPORT_RDT;
758 }
759 if (!strcasecmp(lower_transport, "TCP"))
760 th->lower_transport = RTSP_LOWER_TRANSPORT_TCP;
761 else
762 th->lower_transport = RTSP_LOWER_TRANSPORT_UDP;
763
764 if (*p == ';')
765 p++;
766 /* get each parameter */
767 while (*p != '\0' && *p != ',') {
768 get_word_sep(parameter, sizeof(parameter), "=;,", &p);
769 if (!strcmp(parameter, "port")) {
770 if (*p == '=') {
771 p++;
772 rtsp_parse_range(&th->port_min, &th->port_max, &p);
773 }
774 } else if (!strcmp(parameter, "client_port")) {
775 if (*p == '=') {
776 p++;
777 rtsp_parse_range(&th->client_port_min,
778 &th->client_port_max, &p);
779 }
780 } else if (!strcmp(parameter, "server_port")) {
781 if (*p == '=') {
782 p++;
783 rtsp_parse_range(&th->server_port_min,
784 &th->server_port_max, &p);
785 }
786 } else if (!strcmp(parameter, "interleaved")) {
787 if (*p == '=') {
788 p++;
789 rtsp_parse_range(&th->interleaved_min,
790 &th->interleaved_max, &p);
791 }
792 } else if (!strcmp(parameter, "multicast")) {
793 if (th->lower_transport == RTSP_LOWER_TRANSPORT_UDP)
794 th->lower_transport = RTSP_LOWER_TRANSPORT_UDP_MULTICAST;
795 } else if (!strcmp(parameter, "ttl")) {
796 if (*p == '=') {
797 p++;
798 th->ttl = strtol(p, (char **)&p, 10);
799 }
800 } else if (!strcmp(parameter, "destination")) {
801 struct in_addr ipaddr;
802
803 if (*p == '=') {
804 p++;
805 get_word_sep(buf, sizeof(buf), ";,", &p);
806 if (inet_aton(buf, &ipaddr))
807 th->destination = ntohl(ipaddr.s_addr);
808 }
809 }
810 while (*p != ';' && *p != '\0' && *p != ',')
811 p++;
812 if (*p == ';')
813 p++;
814 }
815 if (*p == ',')
816 p++;
817
818 reply->nb_transports++;
819 }
820 }
821
822 void rtsp_parse_line(RTSPMessageHeader *reply, const char *buf)
823 {
824 const char *p;
825
826 /* NOTE: we do case independent match for broken servers */
827 p = buf;
828 if (av_stristart(p, "Session:", &p)) {
829 int t;
830 get_word_sep(reply->session_id, sizeof(reply->session_id), ";", &p);
831 if (av_stristart(p, ";timeout=", &p) &&
832 (t = strtol(p, NULL, 10)) > 0) {
833 reply->timeout = t;
834 }
835 } else if (av_stristart(p, "Content-Length:", &p)) {
836 reply->content_length = strtol(p, NULL, 10);
837 } else if (av_stristart(p, "Transport:", &p)) {
838 rtsp_parse_transport(reply, p);
839 } else if (av_stristart(p, "CSeq:", &p)) {
840 reply->seq = strtol(p, NULL, 10);
841 } else if (av_stristart(p, "Range:", &p)) {
842 rtsp_parse_range_npt(p, &reply->range_start, &reply->range_end);
843 } else if (av_stristart(p, "RealChallenge1:", &p)) {
844 skip_spaces(&p);
845 av_strlcpy(reply->real_challenge, p, sizeof(reply->real_challenge));
846 } else if (av_stristart(p, "Server:", &p)) {
847 skip_spaces(&p);
848 av_strlcpy(reply->server, p, sizeof(reply->server));
849 } else if (av_stristart(p, "Notice:", &p) ||
850 av_stristart(p, "X-Notice:", &p)) {
851 reply->notice = strtol(p, NULL, 10);
852 } else if (av_stristart(p, "Location:", &p)) {
853 skip_spaces(&p);
854 av_strlcpy(reply->location, p , sizeof(reply->location));
855 }
856 }
857
858 /* skip a RTP/TCP interleaved packet */
859 static void rtsp_skip_packet(AVFormatContext *s)
860 {
861 RTSPState *rt = s->priv_data;
862 int ret, len, len1;
863 uint8_t buf[1024];
864
865 ret = url_read_complete(rt->rtsp_hd, buf, 3);
866 if (ret != 3)
867 return;
868 len = AV_RB16(buf + 1);
869
870 dprintf(s, "skipping RTP packet len=%d\n", len);
871
872 /* skip payload */
873 while (len > 0) {
874 len1 = len;
875 if (len1 > sizeof(buf))
876 len1 = sizeof(buf);
877 ret = url_read_complete(rt->rtsp_hd, buf, len1);
878 if (ret != len1)
879 return;
880 len -= len1;
881 }
882 }
883
884 int rtsp_read_reply(AVFormatContext *s, RTSPMessageHeader *reply,
885 unsigned char **content_ptr,
886 int return_on_interleaved_data)
887 {
888 RTSPState *rt = s->priv_data;
889 char buf[4096], buf1[1024], *q;
890 unsigned char ch;
891 const char *p;
892 int ret, content_length, line_count = 0;
893 unsigned char *content = NULL;
894
895 memset(reply, 0, sizeof(*reply));
896
897 /* parse reply (XXX: use buffers) */
898 rt->last_reply[0] = '\0';
899 for (;;) {
900 q = buf;
901 for (;;) {
902 ret = url_read_complete(rt->rtsp_hd, &ch, 1);
903 #ifdef DEBUG_RTP_TCP
904 dprintf(s, "ret=%d c=%02x [%c]\n", ret, ch, ch);
905 #endif
906 if (ret != 1)
907 return -1;
908 if (ch == '\n')
909 break;
910 if (ch == '$') {
911 /* XXX: only parse it if first char on line ? */
912 if (return_on_interleaved_data) {
913 return 1;
914 } else
915 rtsp_skip_packet(s);
916 } else if (ch != '\r') {
917 if ((q - buf) < sizeof(buf) - 1)
918 *q++ = ch;
919 }
920 }
921 *q = '\0';
922
923 dprintf(s, "line='%s'\n", buf);
924
925 /* test if last line */
926 if (buf[0] == '\0')
927 break;
928 p = buf;
929 if (line_count == 0) {
930 /* get reply code */
931 get_word(buf1, sizeof(buf1), &p);
932 get_word(buf1, sizeof(buf1), &p);
933 reply->status_code = atoi(buf1);
934 } else {
935 rtsp_parse_line(reply, p);
936 av_strlcat(rt->last_reply, p, sizeof(rt->last_reply));
937 av_strlcat(rt->last_reply, "\n", sizeof(rt->last_reply));
938 }
939 line_count++;
940 }
941
942 if (rt->session_id[0] == '\0' && reply->session_id[0] != '\0')
943 av_strlcpy(rt->session_id, reply->session_id, sizeof(rt->session_id));
944
945 content_length = reply->content_length;
946 if (content_length > 0) {
947 /* leave some room for a trailing '\0' (useful for simple parsing) */
948 content = av_malloc(content_length + 1);
949 (void)url_read_complete(rt->rtsp_hd, content, content_length);
950 content[content_length] = '\0';
951 }
952 if (content_ptr)
953 *content_ptr = content;
954 else
955 av_free(content);
956
957 /* EOS */
958 if (reply->notice == 2101 /* End-of-Stream Reached */ ||
959 reply->notice == 2104 /* Start-of-Stream Reached */ ||
960 reply->notice == 2306 /* Continuous Feed Terminated */) {
961 rt->state = RTSP_STATE_IDLE;
962 } else if (reply->notice >= 4400 && reply->notice < 5500) {
963 return AVERROR(EIO); /* data or server error */
964 } else if (reply->notice == 2401 /* Ticket Expired */ ||
965 (reply->notice >= 5500 && reply->notice < 5600) /* end of term */ )
966 return AVERROR(EPERM);
967
968 return 0;
969 }
970
971 void rtsp_send_cmd_with_content_async(AVFormatContext *s,
972 const char *cmd,
973 const unsigned char *send_content,
974 int send_content_length)
975 {
976 RTSPState *rt = s->priv_data;
977 char buf[4096], buf1[1024];
978
979 rt->seq++;
980 av_strlcpy(buf, cmd, sizeof(buf));
981 snprintf(buf1, sizeof(buf1), "CSeq: %d\r\n", rt->seq);
982 av_strlcat(buf, buf1, sizeof(buf));
983 if (rt->session_id[0] != '\0' && !strstr(cmd, "\nIf-Match:")) {
984 snprintf(buf1, sizeof(buf1), "Session: %s\r\n", rt->session_id);
985 av_strlcat(buf, buf1, sizeof(buf));
986 }
987 if (rt->auth_b64)
988 av_strlcatf(buf, sizeof(buf),
989 "Authorization: Basic %s\r\n",
990 rt->auth_b64);
991 if (send_content_length > 0 && send_content)
992 av_strlcatf(buf, sizeof(buf), "Content-Length: %d\r\n", send_content_length);
993 av_strlcat(buf, "\r\n", sizeof(buf));
994
995 dprintf(s, "Sending:\n%s--\n", buf);
996
997 url_write(rt->rtsp_hd, buf, strlen(buf));
998 if (send_content_length > 0 && send_content)
999 url_write(rt->rtsp_hd, send_content, send_content_length);
1000 rt->last_cmd_time = av_gettime();
1001 }
1002
1003 void rtsp_send_cmd_async(AVFormatContext *s, const char *cmd)
1004 {
1005 rtsp_send_cmd_with_content_async(s, cmd, NULL, 0);
1006 }
1007
1008 void rtsp_send_cmd(AVFormatContext *s,
1009 const char *cmd, RTSPMessageHeader *reply,
1010 unsigned char **content_ptr)
1011 {
1012 rtsp_send_cmd_async(s, cmd);
1013
1014 rtsp_read_reply(s, reply, content_ptr, 0);
1015 }
1016
1017 void rtsp_send_cmd_with_content(AVFormatContext *s,
1018 const char *cmd,
1019 RTSPMessageHeader *reply,
1020 unsigned char **content_ptr,
1021 const unsigned char *send_content,
1022 int send_content_length)
1023 {
1024 rtsp_send_cmd_with_content_async(s, cmd, send_content, send_content_length);
1025
1026 rtsp_read_reply(s, reply, content_ptr, 0);
1027 }
1028
1029 /**
1030 * @returns 0 on success, <0 on error, 1 if protocol is unavailable.
1031 */
1032 static int make_setup_request(AVFormatContext *s, const char *host, int port,
1033 int lower_transport, const char *real_challenge)
1034 {
1035 RTSPState *rt = s->priv_data;
1036 int rtx, j, i, err, interleave = 0;
1037 RTSPStream *rtsp_st;
1038 RTSPMessageHeader reply1, *reply = &reply1;
1039 char cmd[2048];
1040 const char *trans_pref;
1041
1042 if (rt->transport == RTSP_TRANSPORT_RDT)
1043 trans_pref = "x-pn-tng";
1044 else
1045 trans_pref = "RTP/AVP";
1046
1047 /* default timeout: 1 minute */
1048 rt->timeout = 60;
1049
1050 /* for each stream, make the setup request */
1051 /* XXX: we assume the same server is used for the control of each
1052 * RTSP stream */
1053
1054 for (j = RTSP_RTP_PORT_MIN, i = 0; i < rt->nb_rtsp_streams; ++i) {
1055 char transport[2048];
1056
1057 /**
1058 * WMS serves all UDP data over a single connection, the RTX, which
1059 * isn't necessarily the first in the SDP but has to be the first
1060 * to be set up, else the second/third SETUP will fail with a 461.
1061 */
1062 if (lower_transport == RTSP_LOWER_TRANSPORT_UDP &&
1063 rt->server_type == RTSP_SERVER_WMS) {
1064 if (i == 0) {
1065 /* rtx first */
1066 for (rtx = 0; rtx < rt->nb_rtsp_streams; rtx++) {
1067 int len = strlen(rt->rtsp_streams[rtx]->control_url);
1068 if (len >= 4 &&
1069 !strcmp(rt->rtsp_streams[rtx]->control_url + len - 4,
1070 "/rtx"))
1071 break;
1072 }
1073 if (rtx == rt->nb_rtsp_streams)
1074 return -1; /* no RTX found */
1075 rtsp_st = rt->rtsp_streams[rtx];
1076 } else
1077 rtsp_st = rt->rtsp_streams[i > rtx ? i : i - 1];
1078 } else
1079 rtsp_st = rt->rtsp_streams[i];
1080
1081 /* RTP/UDP */
1082 if (lower_transport == RTSP_LOWER_TRANSPORT_UDP) {
1083 char buf[256];
1084
1085 if (rt->server_type == RTSP_SERVER_WMS && i > 1) {
1086 port = reply->transports[0].client_port_min;
1087 goto have_port;
1088 }
1089
1090 /* first try in specified port range */
1091 if (RTSP_RTP_PORT_MIN != 0) {
1092 while (j <= RTSP_RTP_PORT_MAX) {
1093 snprintf(buf, sizeof(buf), "rtp://%s?localport=%d",
1094 host, j);
1095 /* we will use two ports per rtp stream (rtp and rtcp) */
1096 j += 2;
1097 if (url_open(&rtsp_st->rtp_handle, buf, URL_RDWR) == 0)
1098 goto rtp_opened;
1099 }
1100 }
1101
1102 #if 0
1103 /* then try on any port */
1104 if (url_open(&rtsp_st->rtp_handle, "rtp://", URL_RDONLY) < 0) {
1105 err = AVERROR_INVALIDDATA;
1106 goto fail;
1107 }
1108 #endif
1109
1110 rtp_opened:
1111 port = rtp_get_local_port(rtsp_st->rtp_handle);
1112 have_port:
1113 snprintf(transport, sizeof(transport) - 1,
1114 "%s/UDP;", trans_pref);
1115 if (rt->server_type != RTSP_SERVER_REAL)
1116 av_strlcat(transport, "unicast;", sizeof(transport));
1117 av_strlcatf(transport, sizeof(transport),
1118 "client_port=%d", port);
1119 if (rt->transport == RTSP_TRANSPORT_RTP &&
1120 !(rt->server_type == RTSP_SERVER_WMS && i > 0))
1121 av_strlcatf(transport, sizeof(transport), "-%d", port + 1);
1122 }
1123
1124 /* RTP/TCP */
1125 else if (lower_transport == RTSP_LOWER_TRANSPORT_TCP) {
1126 /** For WMS streams, the application streams are only used for
1127 * UDP. When trying to set it up for TCP streams, the server
1128 * will return an error. Therefore, we skip those streams. */
1129 if (rt->server_type == RTSP_SERVER_WMS &&
1130 s->streams[rtsp_st->stream_index]->codec->codec_type ==
1131 CODEC_TYPE_DATA)
1132 continue;
1133 snprintf(transport, sizeof(transport) - 1,
1134 "%s/TCP;", trans_pref);
1135 if (rt->server_type == RTSP_SERVER_WMS)
1136 av_strlcat(transport, "unicast;", sizeof(transport));
1137 av_strlcatf(transport, sizeof(transport),
1138 "interleaved=%d-%d",
1139 interleave, interleave + 1);
1140 interleave += 2;
1141 }
1142
1143 else if (lower_transport == RTSP_LOWER_TRANSPORT_UDP_MULTICAST) {
1144 snprintf(transport, sizeof(transport) - 1,
1145 "%s/UDP;multicast", trans_pref);
1146 }
1147 if (s->oformat) {
1148 av_strlcat(transport, ";mode=receive", sizeof(transport));
1149 } else if (rt->server_type == RTSP_SERVER_REAL ||
1150 rt->server_type == RTSP_SERVER_WMS)
1151 av_strlcat(transport, ";mode=play", sizeof(transport));
1152 snprintf(cmd, sizeof(cmd),
1153 "SETUP %s RTSP/1.0\r\n"
1154 "Transport: %s\r\n",
1155 rtsp_st->control_url, transport);
1156 if (i == 0 && rt->server_type == RTSP_SERVER_REAL) {
1157 char real_res[41], real_csum[9];
1158 ff_rdt_calc_response_and_checksum(real_res, real_csum,
1159 real_challenge);
1160 av_strlcatf(cmd, sizeof(cmd),
1161 "If-Match: %s\r\n"
1162 "RealChallenge2: %s, sd=%s\r\n",
1163 rt->session_id, real_res, real_csum);
1164 }
1165 rtsp_send_cmd(s, cmd, reply, NULL);
1166 if (reply->status_code == 461 /* Unsupported protocol */ && i == 0) {
1167 err = 1;
1168 goto fail;
1169 } else if (reply->status_code != RTSP_STATUS_OK ||
1170 reply->nb_transports != 1) {
1171 err = AVERROR_INVALIDDATA;
1172 goto fail;
1173 }
1174
1175 /* XXX: same protocol for all streams is required */
1176 if (i > 0) {
1177 if (reply->transports[0].lower_transport != rt->lower_transport ||
1178 reply->transports[0].transport != rt->transport) {
1179 err = AVERROR_INVALIDDATA;
1180 goto fail;
1181 }
1182 } else {
1183 rt->lower_transport = reply->transports[0].lower_transport;
1184 rt->transport = reply->transports[0].transport;
1185 }
1186
1187 /* close RTP connection if not choosen */
1188 if (reply->transports[0].lower_transport != RTSP_LOWER_TRANSPORT_UDP &&
1189 (lower_transport == RTSP_LOWER_TRANSPORT_UDP)) {
1190 url_close(rtsp_st->rtp_handle);
1191 rtsp_st->rtp_handle = NULL;
1192 }
1193
1194 switch(reply->transports[0].lower_transport) {
1195 case RTSP_LOWER_TRANSPORT_TCP:
1196 rtsp_st->interleaved_min = reply->transports[0].interleaved_min;
1197 rtsp_st->interleaved_max = reply->transports[0].interleaved_max;
1198 break;
1199
1200 case RTSP_LOWER_TRANSPORT_UDP: {
1201 char url[1024];
1202
1203 /* XXX: also use address if specified */
1204 snprintf(url, sizeof(url), "rtp://%s:%d",
1205 host, reply->transports[0].server_port_min);
1206 if (!(rt->server_type == RTSP_SERVER_WMS && i > 1) &&
1207 rtp_set_remote_url(rtsp_st->rtp_handle, url) < 0) {
1208 err = AVERROR_INVALIDDATA;
1209 goto fail;
1210 }
1211 /* Try to initialize the connection state in a
1212 * potential NAT router by sending dummy packets.
1213 * RTP/RTCP dummy packets are used for RDT, too.
1214 */
1215 if (!(rt->server_type == RTSP_SERVER_WMS && i > 1) && s->iformat)
1216 rtp_send_punch_packets(rtsp_st->rtp_handle);
1217 break;
1218 }
1219 case RTSP_LOWER_TRANSPORT_UDP_MULTICAST: {
1220 char url[1024];
1221 struct in_addr in;
1222 int port, ttl;
1223
1224 if (reply->transports[0].destination) {
1225 in.s_addr = htonl(reply->transports[0].destination);
1226 port = reply->transports[0].port_min;
1227 ttl = reply->transports[0].ttl;
1228 } else {
1229 in = rtsp_st->sdp_ip;
1230 port = rtsp_st->sdp_port;
1231 ttl = rtsp_st->sdp_ttl;
1232 }
1233 snprintf(url, sizeof(url), "rtp://%s:%d?ttl=%d",
1234 inet_ntoa(in), port, ttl);
1235 if (url_open(&rtsp_st->rtp_handle, url, URL_RDWR) < 0) {
1236 err = AVERROR_INVALIDDATA;
1237 goto fail;
1238 }
1239 break;
1240 }
1241 }
1242
1243 if ((err = rtsp_open_transport_ctx(s, rtsp_st)))
1244 goto fail;
1245 }
1246
1247 if (reply->timeout > 0)
1248 rt->timeout = reply->timeout;
1249
1250 if (rt->server_type == RTSP_SERVER_REAL)
1251 rt->need_subscription = 1;
1252
1253 return 0;
1254
1255 fail:
1256 for (i = 0; i < rt->nb_rtsp_streams; i++) {
1257 if (rt->rtsp_streams[i]->rtp_handle) {
1258 url_close(rt->rtsp_streams[i]->rtp_handle);
1259 rt->rtsp_streams[i]->rtp_handle = NULL;
1260 }
1261 }
1262 return err;
1263 }
1264
1265 static int rtsp_read_play(AVFormatContext *s)
1266 {
1267 RTSPState *rt = s->priv_data;
1268 RTSPMessageHeader reply1, *reply = &reply1;
1269 char cmd[1024];
1270
1271 av_log(s, AV_LOG_DEBUG, "hello state=%d\n", rt->state);
1272
1273 if (!(rt->server_type == RTSP_SERVER_REAL && rt->need_subscription)) {
1274 if (rt->state == RTSP_STATE_PAUSED) {
1275 snprintf(cmd, sizeof(cmd),
1276 "PLAY %s RTSP/1.0\r\n",
1277 rt->control_uri);
1278 } else {
1279 snprintf(cmd, sizeof(cmd),
1280 "PLAY %s RTSP/1.0\r\n"
1281 "Range: npt=%0.3f-\r\n",
1282 rt->control_uri,
1283 (double)rt->seek_timestamp / AV_TIME_BASE);
1284 }
1285 rtsp_send_cmd(s, cmd, reply, NULL);
1286 if (reply->status_code != RTSP_STATUS_OK) {
1287 return -1;
1288 }
1289 }
1290 rt->state = RTSP_STATE_STREAMING;
1291 return 0;
1292 }
1293
1294 static int rtsp_setup_input_streams(AVFormatContext *s)
1295 {
1296 RTSPState *rt = s->priv_data;
1297 RTSPMessageHeader reply1, *reply = &reply1;
1298 char cmd[1024];
1299 unsigned char *content = NULL;
1300 int ret;
1301
1302 /* describe the stream */
1303 snprintf(cmd, sizeof(cmd),
1304 "DESCRIBE %s RTSP/1.0\r\n"
1305 "Accept: application/sdp\r\n",
1306 s->filename);
1307 if (rt->server_type == RTSP_SERVER_REAL) {
1308 /**
1309 * The Require: attribute is needed for proper streaming from
1310 * Realmedia servers.
1311 */
1312 av_strlcat(cmd,
1313 "Require: com.real.retain-entity-for-setup\r\n",
1314 sizeof(cmd));
1315 }
1316 rtsp_send_cmd(s, cmd, reply, &content);
1317 if (!content)
1318 return AVERROR_INVALIDDATA;
1319 if (reply->status_code != RTSP_STATUS_OK) {
1320 av_freep(&content);
1321 return AVERROR_INVALIDDATA;
1322 }
1323
1324 /* now we got the SDP description, we parse it */
1325 ret = sdp_parse(s, (const char *)content);
1326 av_freep(&content);
1327 if (ret < 0)
1328 return AVERROR_INVALIDDATA;
1329
1330 return 0;
1331 }
1332
1333 static int rtsp_setup_output_streams(AVFormatContext *s)
1334 {
1335 RTSPState *rt = s->priv_data;
1336 RTSPMessageHeader reply1, *reply = &reply1;
1337 char cmd[1024];
1338 int i;
1339 char *sdp;
1340
1341 /* Announce the stream */
1342 snprintf(cmd, sizeof(cmd),
1343 "ANNOUNCE %s RTSP/1.0\r\n"
1344 "Content-Type: application/sdp\r\n",
1345 s->filename);
1346 sdp = av_mallocz(8192);
1347 if (sdp == NULL)
1348 return AVERROR(ENOMEM);
1349 if (avf_sdp_create(&s, 1, sdp, 8192)) {
1350 av_free(sdp);
1351 return AVERROR_INVALIDDATA;
1352 }
1353 av_log(s, AV_LOG_INFO, "SDP:\n%s\n", sdp);
1354 rtsp_send_cmd_with_content(s, cmd, reply, NULL, sdp, strlen(sdp));
1355 av_free(sdp);
1356 if (reply->status_code != RTSP_STATUS_OK)
1357 return AVERROR_INVALIDDATA;
1358
1359 /* Set up the RTSPStreams for each AVStream */
1360 for (i = 0; i < s->nb_streams; i++) {
1361 RTSPStream *rtsp_st;
1362 AVStream *st = s->streams[i];
1363
1364 rtsp_st = av_mallocz(sizeof(RTSPStream));
1365 if (!rtsp_st)
1366 return AVERROR(ENOMEM);
1367 dynarray_add(&rt->rtsp_streams, &rt->nb_rtsp_streams, rtsp_st);
1368
1369 st->priv_data = rtsp_st;
1370 rtsp_st->stream_index = i;
1371
1372 av_strlcpy(rtsp_st->control_url, s->filename, sizeof(rtsp_st->control_url));
1373 /* Note, this must match the relative uri set in the sdp content */
1374 av_strlcatf(rtsp_st->control_url, sizeof(rtsp_st->control_url),
1375 "/streamid=%d", i);
1376 }
1377
1378 return 0;
1379 }
1380
1381 int rtsp_connect(AVFormatContext *s)
1382 {
1383 RTSPState *rt = s->priv_data;
1384 char host[1024], path[1024], tcpname[1024], cmd[2048], auth[128];
1385 char *option_list, *option, *filename;
1386 URLContext *rtsp_hd;
1387 int port, err;
1388 RTSPMessageHeader reply1, *reply = &reply1;
1389 int lower_transport_mask = 0;
1390 char real_challenge[64];
1391 redirect:
1392 /* extract hostname and port */
1393 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 snprintf(tcpname, sizeof(tcpname), "tcp://%s:%d", host, port);
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 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 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 return err;
1535 }
1536 #endif
1537
1538 #if CONFIG_RTSP_DEMUXER
1539 static int rtsp_read_header(AVFormatContext *s,
1540 AVFormatParameters *ap)
1541 {
1542 RTSPState *rt = s->priv_data;
1543 int ret;
1544
1545 ret = rtsp_connect(s);
1546 if (ret)
1547 return ret;
1548
1549 if (ap->initial_pause) {
1550 /* do not start immediately */
1551 } else {
1552 if (rtsp_read_play(s) < 0) {
1553 rtsp_close_streams(s);
1554 url_close(rt->rtsp_hd);
1555 return AVERROR_INVALIDDATA;
1556 }
1557 }
1558
1559 return 0;
1560 }
1561
1562 static int udp_read_packet(AVFormatContext *s, RTSPStream **prtsp_st,
1563 uint8_t *buf, int buf_size)
1564 {
1565 RTSPState *rt = s->priv_data;
1566 RTSPStream *rtsp_st;
1567 fd_set rfds;
1568 int fd, fd_max, n, i, ret, tcp_fd;
1569 struct timeval tv;
1570
1571 for (;;) {
1572 if (url_interrupt_cb())
1573 return AVERROR(EINTR);
1574 FD_ZERO(&rfds);
1575 if (rt->rtsp_hd) {
1576 tcp_fd = fd_max = url_get_file_handle(rt->rtsp_hd);
1577 FD_SET(tcp_fd, &rfds);
1578 } else {
1579 fd_max = 0;
1580 tcp_fd = -1;
1581 }
1582 for (i = 0; i < rt->nb_rtsp_streams; i++) {
1583 rtsp_st = rt->rtsp_streams[i];
1584 if (rtsp_st->rtp_handle) {
1585 /* currently, we cannot probe RTCP handle because of
1586 * blocking restrictions */
1587 fd = url_get_file_handle(rtsp_st->rtp_handle);
1588 if (fd > fd_max)
1589 fd_max = fd;
1590 FD_SET(fd, &rfds);
1591 }
1592 }
1593 tv.tv_sec = 0;
1594 tv.tv_usec = 100 * 1000;
1595 n = select(fd_max + 1, &rfds, NULL, NULL, &tv);
1596 if (n > 0) {
1597 for (i = 0; i < rt->nb_rtsp_streams; i++) {
1598 rtsp_st = rt->rtsp_streams[i];
1599 if (rtsp_st->rtp_handle) {
1600 fd = url_get_file_handle(rtsp_st->rtp_handle);
1601 if (FD_ISSET(fd, &rfds)) {
1602 ret = url_read(rtsp_st->rtp_handle, buf, buf_size);
1603 if (ret > 0) {
1604 *prtsp_st = rtsp_st;
1605 return ret;
1606 }
1607 }
1608 }
1609 }
1610 #if CONFIG_RTSP_DEMUXER
1611 if (tcp_fd != -1 && FD_ISSET(tcp_fd, &rfds)) {
1612 RTSPMessageHeader reply;
1613
1614 rtsp_read_reply(s, &reply, NULL, 0);
1615 /* XXX: parse message */
1616 if (rt->state != RTSP_STATE_STREAMING)
1617 return 0;
1618 }
1619 #endif
1620 }
1621 }
1622 }
1623
1624 static int tcp_read_packet(AVFormatContext *s, RTSPStream **prtsp_st,
1625 uint8_t *buf, int buf_size)
1626 {
1627 RTSPState *rt = s->priv_data;
1628 int id, len, i, ret;
1629 RTSPStream *rtsp_st;
1630
1631 #ifdef DEBUG_RTP_TCP
1632 dprintf(s, "tcp_read_packet:\n");
1633 #endif
1634 redo:
1635 for (;;) {
1636 RTSPMessageHeader reply;
1637
1638 ret = rtsp_read_reply(s, &reply, NULL, 1);
1639 if (ret == -1)
1640 return -1;
1641 if (ret == 1) /* received '$' */
1642 break;
1643 /* XXX: parse message */
1644 if (rt->state != RTSP_STATE_STREAMING)
1645 return 0;
1646 }
1647 ret = url_read_complete(rt->rtsp_hd, buf, 3);
1648 if (ret != 3)
1649 return -1;
1650 id = buf[0];
1651 len = AV_RB16(buf + 1);
1652 #ifdef DEBUG_RTP_TCP
1653 dprintf(s, "id=%d len=%d\n", id, len);
1654 #endif
1655 if (len > buf_size || len < 12)
1656 goto redo;
1657 /* get the data */
1658 ret = url_read_complete(rt->rtsp_hd, buf, len);
1659 if (ret != len)
1660 return -1;
1661 if (rt->transport == RTSP_TRANSPORT_RDT &&
1662 ff_rdt_parse_header(buf, len, &id, NULL, NULL, NULL, NULL) < 0)
1663 return -1;
1664
1665 /* find the matching stream */
1666 for (i = 0; i < rt->nb_rtsp_streams; i++) {
1667 rtsp_st = rt->rtsp_streams[i];
1668 if (id >= rtsp_st->interleaved_min &&
1669 id <= rtsp_st->interleaved_max)
1670 goto found;
1671 }
1672 goto redo;
1673 found:
1674 *prtsp_st = rtsp_st;
1675 return len;
1676 }
1677
1678 static int rtsp_fetch_packet(AVFormatContext *s, AVPacket *pkt)
1679 {
1680 RTSPState *rt = s->priv_data;
1681 int ret, len;
1682 uint8_t buf[10 * RTP_MAX_PACKET_LENGTH];
1683 RTSPStream *rtsp_st;
1684
1685 /* get next frames from the same RTP packet */
1686 if (rt->cur_transport_priv) {
1687 if (rt->transport == RTSP_TRANSPORT_RDT) {
1688 ret = ff_rdt_parse_packet(rt->cur_transport_priv, pkt, NULL, 0);
1689 } else
1690 ret = rtp_parse_packet(rt->cur_transport_priv, pkt, NULL, 0);
1691 if (ret == 0) {
1692 rt->cur_transport_priv = NULL;
1693 return 0;
1694 } else if (ret == 1) {
1695 return 0;
1696 } else
1697 rt->cur_transport_priv = NULL;
1698 }
1699
1700 /* read next RTP packet */
1701 redo:
1702 switch(rt->lower_transport) {
1703 default:
1704 #if CONFIG_RTSP_DEMUXER
1705 case RTSP_LOWER_TRANSPORT_TCP:
1706 len = tcp_read_packet(s, &rtsp_st, buf, sizeof(buf));
1707 break;
1708 #endif
1709 case RTSP_LOWER_TRANSPORT_UDP:
1710 case RTSP_LOWER_TRANSPORT_UDP_MULTICAST:
1711 len = udp_read_packet(s, &rtsp_st, buf, sizeof(buf));
1712 if (len >=0 && rtsp_st->transport_priv && rt->transport == RTSP_TRANSPORT_RTP)
1713 rtp_check_and_send_back_rr(rtsp_st->transport_priv, len);
1714 break;
1715 }
1716 if (len < 0)
1717 return len;
1718 if (len == 0)
1719 return AVERROR_EOF;
1720 if (rt->transport == RTSP_TRANSPORT_RDT) {
1721 ret = ff_rdt_parse_packet(rtsp_st->transport_priv, pkt, buf, len);
1722 } else
1723 ret = rtp_parse_packet(rtsp_st->transport_priv, pkt, buf, len);
1724 if (ret < 0)
1725 goto redo;
1726 if (ret == 1)
1727 /* more packets may follow, so we save the RTP context */
1728 rt->cur_transport_priv = rtsp_st->transport_priv;
1729
1730 return ret;
1731 }
1732
1733 static int rtsp_read_packet(AVFormatContext *s, AVPacket *pkt)
1734 {
1735 RTSPState *rt = s->priv_data;
1736 int ret;
1737 RTSPMessageHeader reply1, *reply = &reply1;
1738 char cmd[1024];
1739
1740 if (rt->server_type == RTSP_SERVER_REAL) {
1741 int i;
1742 enum AVDiscard cache[MAX_STREAMS];
1743
1744 for (i = 0; i < s->nb_streams; i++)
1745 cache[i] = s->streams[i]->discard;
1746
1747 if (!rt->need_subscription) {
1748 if (memcmp (cache, rt->real_setup_cache,
1749 sizeof(enum AVDiscard) * s->nb_streams)) {
1750 snprintf(cmd, sizeof(cmd),
1751 "SET_PARAMETER %s RTSP/1.0\r\n"
1752 "Unsubscribe: %s\r\n",
1753 rt->control_uri, rt->last_subscription);
1754 rtsp_send_cmd(s, cmd, reply, NULL);
1755 if (reply->status_code != RTSP_STATUS_OK)
1756 return AVERROR_INVALIDDATA;
1757 rt->need_subscription = 1;
1758 }
1759 }
1760
1761 if (rt->need_subscription) {
1762 int r, rule_nr, first = 1;
1763
1764 memcpy(rt->real_setup_cache, cache,
1765 sizeof(enum AVDiscard) * s->nb_streams);
1766 rt->last_subscription[0] = 0;
1767
1768 snprintf(cmd, sizeof(cmd),
1769 "SET_PARAMETER %s RTSP/1.0\r\n"
1770 "Subscribe: ",
1771 rt->control_uri);
1772 for (i = 0; i < rt->nb_rtsp_streams; i++) {
1773 rule_nr = 0;
1774 for (r = 0; r < s->nb_streams; r++) {
1775 if (s->streams[r]->priv_data == rt->rtsp_streams[i]) {
1776 if (s->streams[r]->discard != AVDISCARD_ALL) {
1777 if (!first)
1778 av_strlcat(rt->last_subscription, ",",
1779 sizeof(rt->last_subscription));
1780 ff_rdt_subscribe_rule(
1781 rt->last_subscription,
1782 sizeof(rt->last_subscription), i, rule_nr);
1783 first = 0;
1784 }
1785 rule_nr++;
1786 }
1787 }
1788 }
1789 av_strlcatf(cmd, sizeof(cmd), "%s\r\n", rt->last_subscription);
1790 rtsp_send_cmd(s, cmd, reply, NULL);
1791 if (reply->status_code != RTSP_STATUS_OK)
1792 return AVERROR_INVALIDDATA;
1793 rt->need_subscription = 0;
1794
1795 if (rt->state == RTSP_STATE_STREAMING)
1796 rtsp_read_play (s);
1797 }
1798 }
1799
1800 ret = rtsp_fetch_packet(s, pkt);
1801 if (ret < 0)
1802 return ret;
1803
1804 /* send dummy request to keep TCP connection alive */
1805 if ((rt->server_type == RTSP_SERVER_WMS ||
1806 rt->server_type == RTSP_SERVER_REAL) &&
1807 (av_gettime() - rt->last_cmd_time) / 1000000 >= rt->timeout / 2) {
1808 if (rt->server_type == RTSP_SERVER_WMS) {
1809 snprintf(cmd, sizeof(cmd) - 1,
1810 "GET_PARAMETER %s RTSP/1.0\r\n",
1811 rt->control_uri);
1812 rtsp_send_cmd_async(s, cmd);
1813 } else {
1814 rtsp_send_cmd_async(s, "OPTIONS * RTSP/1.0\r\n");
1815 }
1816 }
1817
1818 return 0;
1819 }
1820
1821 /* pause the stream */
1822 static int rtsp_read_pause(AVFormatContext *s)
1823 {
1824 RTSPState *rt = s->priv_data;
1825 RTSPMessageHeader reply1, *reply = &reply1;
1826 char cmd[1024];
1827
1828 rt = s->priv_data;
1829
1830 if (rt->state != RTSP_STATE_STREAMING)
1831 return 0;
1832 else if (!(rt->server_type == RTSP_SERVER_REAL && rt->need_subscription)) {
1833 snprintf(cmd, sizeof(cmd),
1834 "PAUSE %s RTSP/1.0\r\n",
1835 rt->control_uri);
1836 rtsp_send_cmd(s, cmd, reply, NULL);
1837 if (reply->status_code != RTSP_STATUS_OK) {
1838 return -1;
1839 }
1840 }
1841 rt->state = RTSP_STATE_PAUSED;
1842 return 0;
1843 }
1844
1845 static int rtsp_read_seek(AVFormatContext *s, int stream_index,
1846 int64_t timestamp, int flags)
1847 {
1848 RTSPState *rt = s->priv_data;
1849
1850 rt->seek_timestamp = av_rescale_q(timestamp,
1851 s->streams[stream_index]->time_base,
1852 AV_TIME_BASE_Q);
1853 switch(rt->state) {
1854 default:
1855 case RTSP_STATE_IDLE:
1856 break;
1857 case RTSP_STATE_STREAMING:
1858 if (rtsp_read_pause(s) != 0)
1859 return -1;
1860 rt->state = RTSP_STATE_SEEKING;
1861 if (rtsp_read_play(s) != 0)
1862 return -1;
1863 break;
1864 case RTSP_STATE_PAUSED:
1865 rt->state = RTSP_STATE_IDLE;
1866 break;
1867 }
1868 return 0;
1869 }
1870
1871 static int rtsp_read_close(AVFormatContext *s)
1872 {
1873 RTSPState *rt = s->priv_data;
1874 char cmd[1024];
1875
1876 #if 0
1877 /* NOTE: it is valid to flush the buffer here */
1878 if (rt->lower_transport == RTSP_LOWER_TRANSPORT_TCP) {
1879 url_fclose(&rt->rtsp_gb);
1880 }
1881 #endif
1882 snprintf(cmd, sizeof(cmd),
1883 "TEARDOWN %s RTSP/1.0\r\n",
1884 s->filename);
1885 rtsp_send_cmd_async(s, cmd);
1886
1887 rtsp_close_streams(s);
1888 url_close(rt->rtsp_hd);
1889 return 0;
1890 }
1891
1892 AVInputFormat rtsp_demuxer = {
1893 "rtsp",
1894 NULL_IF_CONFIG_SMALL("RTSP input format"),
1895 sizeof(RTSPState),
1896 rtsp_probe,
1897 rtsp_read_header,
1898 rtsp_read_packet,
1899 rtsp_read_close,
1900 rtsp_read_seek,
1901 .flags = AVFMT_NOFILE,
1902 .read_play = rtsp_read_play,
1903 .read_pause = rtsp_read_pause,
1904 };
1905 #endif
1906
1907 static int sdp_probe(AVProbeData *p1)
1908 {
1909 const char *p = p1->buf, *p_end = p1->buf + p1->buf_size;
1910
1911 /* we look for a line beginning "c=IN IP4" */
1912 while (p < p_end && *p != '\0') {
1913 if (p + sizeof("c=IN IP4") - 1 < p_end &&
1914 av_strstart(p, "c=IN IP4", NULL))
1915 return AVPROBE_SCORE_MAX / 2;
1916
1917 while (p < p_end - 1 && *p != '\n') p++;
1918 if (++p >= p_end)
1919 break;
1920 if (*p == '\r')
1921 p++;
1922 }
1923 return 0;
1924 }
1925
1926 #define SDP_MAX_SIZE 8192
1927
1928 static int sdp_read_header(AVFormatContext *s, AVFormatParameters *ap)
1929 {
1930 RTSPState *rt = s->priv_data;
1931 RTSPStream *rtsp_st;
1932 int size, i, err;
1933 char *content;
1934 char url[1024];
1935
1936 /* read the whole sdp file */
1937 /* XXX: better loading */
1938 content = av_malloc(SDP_MAX_SIZE);
1939 size = get_buffer(s->pb, content, SDP_MAX_SIZE - 1);
1940 if (size <= 0) {
1941 av_free(content);
1942 return AVERROR_INVALIDDATA;
1943 }
1944 content[size] ='\0';
1945
1946 sdp_parse(s, content);
1947 av_free(content);
1948
1949 /* open each RTP stream */
1950 for (i = 0; i < rt->nb_rtsp_streams; i++) {
1951 rtsp_st = rt->rtsp_streams[i];
1952
1953 snprintf(url, sizeof(url), "rtp://%s:%d?localport=%d&ttl=%d",
1954 inet_ntoa(rtsp_st->sdp_ip),
1955 rtsp_st->sdp_port,
1956 rtsp_st->sdp_port,
1957 rtsp_st->sdp_ttl);
1958 if (url_open(&rtsp_st->rtp_handle, url, URL_RDWR) < 0) {
1959 err = AVERROR_INVALIDDATA;
1960 goto fail;
1961 }
1962 if ((err = rtsp_open_transport_ctx(s, rtsp_st)))
1963 goto fail;
1964 }
1965 return 0;
1966 fail:
1967 rtsp_close_streams(s);
1968 return err;
1969 }
1970
1971 static int sdp_read_close(AVFormatContext *s)
1972 {
1973 rtsp_close_streams(s);
1974 return 0;
1975 }
1976
1977 AVInputFormat sdp_demuxer = {
1978 "sdp",
1979 NULL_IF_CONFIG_SMALL("SDP"),
1980 sizeof(RTSPState),
1981 sdp_probe,
1982 sdp_read_header,
1983 rtsp_fetch_packet,
1984 sdp_read_close,
1985 };