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