Simplify interleaving code.
[libav.git] / libavformat / rtsp.c
1 /*
2 * RTSP/SDP client
3 * Copyright (c) 2002 Fabrice Bellard
4 *
5 * This file is part of FFmpeg.
6 *
7 * FFmpeg is free software; you can redistribute it and/or
8 * modify it under the terms of the GNU Lesser General Public
9 * License as published by the Free Software Foundation; either
10 * version 2.1 of the License, or (at your option) any later version.
11 *
12 * FFmpeg is distributed in the hope that it will be useful,
13 * but WITHOUT ANY WARRANTY; without even the implied warranty of
14 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
15 * Lesser General Public License for more details.
16 *
17 * You should have received a copy of the GNU Lesser General Public
18 * License along with FFmpeg; if not, write to the Free Software
19 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
20 */
21
22 #include "libavutil/base64.h"
23 #include "libavutil/avstring.h"
24 #include "libavutil/intreadwrite.h"
25 #include "avformat.h"
26
27 #include <sys/time.h>
28 #if HAVE_SYS_SELECT_H
29 #include <sys/select.h>
30 #endif
31 #include <strings.h>
32 #include "internal.h"
33 #include "network.h"
34 #include "os_support.h"
35 #include "rtsp.h"
36
37 #include "rtpdec.h"
38 #include "rdt.h"
39 #include "rtpdec_asf.h"
40 #include "rtpdec_vorbis.h"
41
42 //#define DEBUG
43 //#define DEBUG_RTP_TCP
44
45 #if LIBAVFORMAT_VERSION_INT < (53 << 16)
46 int rtsp_default_protocols = (1 << RTSP_LOWER_TRANSPORT_UDP);
47 #endif
48
49 /* Timout values for socket select, in ms,
50 * and read_packet(), in seconds */
51 #define SELECT_TIMEOUT_MS 100
52 #define READ_PACKET_TIMEOUT_S 10
53 #define MAX_TIMEOUTS READ_PACKET_TIMEOUT_S * 1000 / SELECT_TIMEOUT_MS
54
55 #define SPACE_CHARS " \t\r\n"
56 /* we use memchr() instead of strchr() here because strchr() will return
57 * the terminating '\0' of SPACE_CHARS instead of NULL if c is '\0'. */
58 #define redir_isspace(c) memchr(SPACE_CHARS, c, 4)
59 static void skip_spaces(const char **pp)
60 {
61 const char *p;
62 p = *pp;
63 while (redir_isspace(*p))
64 p++;
65 *pp = p;
66 }
67
68 static void get_word_until_chars(char *buf, int buf_size,
69 const char *sep, const char **pp)
70 {
71 const char *p;
72 char *q;
73
74 p = *pp;
75 skip_spaces(&p);
76 q = buf;
77 while (!strchr(sep, *p) && *p != '\0') {
78 if ((q - buf) < buf_size - 1)
79 *q++ = *p;
80 p++;
81 }
82 if (buf_size > 0)
83 *q = '\0';
84 *pp = p;
85 }
86
87 static void get_word_sep(char *buf, int buf_size, const char *sep,
88 const char **pp)
89 {
90 if (**pp == '/') (*pp)++;
91 get_word_until_chars(buf, buf_size, sep, pp);
92 }
93
94 static void get_word(char *buf, int buf_size, const char **pp)
95 {
96 get_word_until_chars(buf, buf_size, SPACE_CHARS, pp);
97 }
98
99 /* parse the rtpmap description: <codec_name>/<clock_rate>[/<other params>] */
100 static int sdp_parse_rtpmap(AVFormatContext *s,
101 AVCodecContext *codec, RTSPStream *rtsp_st,
102 int payload_type, const char *p)
103 {
104 char buf[256];
105 int i;
106 AVCodec *c;
107 const char *c_name;
108
109 /* Loop into AVRtpDynamicPayloadTypes[] and AVRtpPayloadTypes[] and
110 * see if we can handle this kind of payload.
111 * The space should normally not be there but some Real streams or
112 * particular servers ("RealServer Version 6.1.3.970", see issue 1658)
113 * have a trailing space. */
114 get_word_sep(buf, sizeof(buf), "/ ", &p);
115 if (payload_type >= RTP_PT_PRIVATE) {
116 RTPDynamicProtocolHandler *handler;
117 for (handler = RTPFirstDynamicPayloadHandler;
118 handler; handler = handler->next) {
119 if (!strcasecmp(buf, handler->enc_name) &&
120 codec->codec_type == handler->codec_type) {
121 codec->codec_id = handler->codec_id;
122 rtsp_st->dynamic_handler = handler;
123 if (handler->open)
124 rtsp_st->dynamic_protocol_context = handler->open();
125 break;
126 }
127 }
128 } else {
129 /* We are in a standard case
130 * (from http://www.iana.org/assignments/rtp-parameters). */
131 /* search into AVRtpPayloadTypes[] */
132 codec->codec_id = ff_rtp_codec_id(buf, codec->codec_type);
133 }
134
135 c = avcodec_find_decoder(codec->codec_id);
136 if (c && c->name)
137 c_name = c->name;
138 else
139 c_name = "(null)";
140
141 get_word_sep(buf, sizeof(buf), "/", &p);
142 i = atoi(buf);
143 switch (codec->codec_type) {
144 case CODEC_TYPE_AUDIO:
145 av_log(s, AV_LOG_DEBUG, "audio codec set to: %s\n", c_name);
146 codec->sample_rate = RTSP_DEFAULT_AUDIO_SAMPLERATE;
147 codec->channels = RTSP_DEFAULT_NB_AUDIO_CHANNELS;
148 if (i > 0) {
149 codec->sample_rate = i;
150 get_word_sep(buf, sizeof(buf), "/", &p);
151 i = atoi(buf);
152 if (i > 0)
153 codec->channels = i;
154 // TODO: there is a bug here; if it is a mono stream, and
155 // less than 22000Hz, faad upconverts to stereo and twice
156 // the frequency. No problem, but the sample rate is being
157 // set here by the sdp line. Patch on its way. (rdm)
158 }
159 av_log(s, AV_LOG_DEBUG, "audio samplerate set to: %i\n",
160 codec->sample_rate);
161 av_log(s, AV_LOG_DEBUG, "audio channels set to: %i\n",
162 codec->channels);
163 break;
164 case CODEC_TYPE_VIDEO:
165 av_log(s, AV_LOG_DEBUG, "video codec set to: %s\n", c_name);
166 break;
167 default:
168 break;
169 }
170 return 0;
171 }
172
173 /* return the length and optionally the data */
174 static int hex_to_data(uint8_t *data, const char *p)
175 {
176 int c, len, v;
177
178 len = 0;
179 v = 1;
180 for (;;) {
181 skip_spaces(&p);
182 if (*p == '\0')
183 break;
184 c = toupper((unsigned char) *p++);
185 if (c >= '0' && c <= '9')
186 c = c - '0';
187 else if (c >= 'A' && c <= 'F')
188 c = c - 'A' + 10;
189 else
190 break;
191 v = (v << 4) | c;
192 if (v & 0x100) {
193 if (data)
194 data[len] = v;
195 len++;
196 v = 1;
197 }
198 }
199 return len;
200 }
201
202 static void sdp_parse_fmtp_config(AVCodecContext * codec, void *ctx,
203 char *attr, char *value)
204 {
205 switch (codec->codec_id) {
206 case CODEC_ID_MPEG4:
207 case CODEC_ID_AAC:
208 if (!strcmp(attr, "config")) {
209 /* decode the hexa encoded parameter */
210 int len = hex_to_data(NULL, value);
211 if (codec->extradata)
212 av_free(codec->extradata);
213 codec->extradata = av_mallocz(len + FF_INPUT_BUFFER_PADDING_SIZE);
214 if (!codec->extradata)
215 return;
216 codec->extradata_size = len;
217 hex_to_data(codec->extradata, value);
218 }
219 break;
220 case CODEC_ID_VORBIS:
221 ff_vorbis_parse_fmtp_config(codec, ctx, attr, value);
222 break;
223 default:
224 break;
225 }
226 return;
227 }
228
229 typedef struct {
230 const char *str;
231 uint16_t type;
232 uint32_t offset;
233 } AttrNameMap;
234
235 /* All known fmtp parmeters and the corresping RTPAttrTypeEnum */
236 #define ATTR_NAME_TYPE_INT 0
237 #define ATTR_NAME_TYPE_STR 1
238 static const AttrNameMap attr_names[]=
239 {
240 { "SizeLength", ATTR_NAME_TYPE_INT,
241 offsetof(RTPPayloadData, sizelength) },
242 { "IndexLength", ATTR_NAME_TYPE_INT,
243 offsetof(RTPPayloadData, indexlength) },
244 { "IndexDeltaLength", ATTR_NAME_TYPE_INT,
245 offsetof(RTPPayloadData, indexdeltalength) },
246 { "profile-level-id", ATTR_NAME_TYPE_INT,
247 offsetof(RTPPayloadData, profile_level_id) },
248 { "StreamType", ATTR_NAME_TYPE_INT,
249 offsetof(RTPPayloadData, streamtype) },
250 { "mode", ATTR_NAME_TYPE_STR,
251 offsetof(RTPPayloadData, mode) },
252 { NULL, -1, -1 },
253 };
254
255 /* parse the attribute line from the fmtp a line of an sdp resonse. This
256 * is broken out as a function because it is used in rtp_h264.c, which is
257 * forthcoming. */
258 int ff_rtsp_next_attr_and_value(const char **p, char *attr, int attr_size,
259 char *value, int value_size)
260 {
261 skip_spaces(p);
262 if (**p) {
263 get_word_sep(attr, attr_size, "=", p);
264 if (**p == '=')
265 (*p)++;
266 get_word_sep(value, value_size, ";", p);
267 if (**p == ';')
268 (*p)++;
269 return 1;
270 }
271 return 0;
272 }
273
274 /* parse a SDP line and save stream attributes */
275 static void sdp_parse_fmtp(AVStream *st, const char *p)
276 {
277 char attr[256];
278 /* Vorbis setup headers can be up to 12KB and are sent base64
279 * encoded, giving a 12KB * (4/3) = 16KB FMTP line. */
280 char value[16384];
281 int i;
282 RTSPStream *rtsp_st = st->priv_data;
283 AVCodecContext *codec = st->codec;
284 RTPPayloadData *rtp_payload_data = &rtsp_st->rtp_payload_data;
285
286 /* loop on each attribute */
287 while (ff_rtsp_next_attr_and_value(&p, attr, sizeof(attr),
288 value, sizeof(value))) {
289 /* grab the codec extra_data from the config parameter of the fmtp
290 * line */
291 sdp_parse_fmtp_config(codec, rtsp_st->dynamic_protocol_context,
292 attr, value);
293 /* Looking for a known attribute */
294 for (i = 0; attr_names[i].str; ++i) {
295 if (!strcasecmp(attr, attr_names[i].str)) {
296 if (attr_names[i].type == ATTR_NAME_TYPE_INT) {
297 *(int *)((char *)rtp_payload_data +
298 attr_names[i].offset) = atoi(value);
299 } else if (attr_names[i].type == ATTR_NAME_TYPE_STR)
300 *(char **)((char *)rtp_payload_data +
301 attr_names[i].offset) = av_strdup(value);
302 }
303 }
304 }
305 }
306
307 /** Parse a string p in the form of Range:npt=xx-xx, and determine the start
308 * and end time.
309 * Used for seeking in the rtp stream.
310 */
311 static void rtsp_parse_range_npt(const char *p, int64_t *start, int64_t *end)
312 {
313 char buf[256];
314
315 skip_spaces(&p);
316 if (!av_stristart(p, "npt=", &p))
317 return;
318
319 *start = AV_NOPTS_VALUE;
320 *end = AV_NOPTS_VALUE;
321
322 get_word_sep(buf, sizeof(buf), "-", &p);
323 *start = parse_date(buf, 1);
324 if (*p == '-') {
325 p++;
326 get_word_sep(buf, sizeof(buf), "-", &p);
327 *end = parse_date(buf, 1);
328 }
329 // av_log(NULL, AV_LOG_DEBUG, "Range Start: %lld\n", *start);
330 // av_log(NULL, AV_LOG_DEBUG, "Range End: %lld\n", *end);
331 }
332
333 typedef struct SDPParseState {
334 /* SDP only */
335 struct in_addr default_ip;
336 int default_ttl;
337 int skip_media; ///< set if an unknown m= line occurs
338 } SDPParseState;
339
340 static void sdp_parse_line(AVFormatContext *s, SDPParseState *s1,
341 int letter, const char *buf)
342 {
343 RTSPState *rt = s->priv_data;
344 char buf1[64], st_type[64];
345 const char *p;
346 enum CodecType codec_type;
347 int payload_type, i;
348 AVStream *st;
349 RTSPStream *rtsp_st;
350 struct in_addr sdp_ip;
351 int ttl;
352
353 dprintf(s, "sdp: %c='%s'\n", letter, buf);
354
355 p = buf;
356 if (s1->skip_media && letter != 'm')
357 return;
358 switch (letter) {
359 case 'c':
360 get_word(buf1, sizeof(buf1), &p);
361 if (strcmp(buf1, "IN") != 0)
362 return;
363 get_word(buf1, sizeof(buf1), &p);
364 if (strcmp(buf1, "IP4") != 0)
365 return;
366 get_word_sep(buf1, sizeof(buf1), "/", &p);
367 if (ff_inet_aton(buf1, &sdp_ip) == 0)
368 return;
369 ttl = 16;
370 if (*p == '/') {
371 p++;
372 get_word_sep(buf1, sizeof(buf1), "/", &p);
373 ttl = atoi(buf1);
374 }
375 if (s->nb_streams == 0) {
376 s1->default_ip = sdp_ip;
377 s1->default_ttl = ttl;
378 } else {
379 st = s->streams[s->nb_streams - 1];
380 rtsp_st = st->priv_data;
381 rtsp_st->sdp_ip = sdp_ip;
382 rtsp_st->sdp_ttl = ttl;
383 }
384 break;
385 case 's':
386 av_metadata_set(&s->metadata, "title", p);
387 break;
388 case 'i':
389 if (s->nb_streams == 0) {
390 av_metadata_set(&s->metadata, "comment", p);
391 break;
392 }
393 break;
394 case 'm':
395 /* new stream */
396 s1->skip_media = 0;
397 get_word(st_type, sizeof(st_type), &p);
398 if (!strcmp(st_type, "audio")) {
399 codec_type = CODEC_TYPE_AUDIO;
400 } else if (!strcmp(st_type, "video")) {
401 codec_type = CODEC_TYPE_VIDEO;
402 } else if (!strcmp(st_type, "application")) {
403 codec_type = CODEC_TYPE_DATA;
404 } else {
405 s1->skip_media = 1;
406 return;
407 }
408 rtsp_st = av_mallocz(sizeof(RTSPStream));
409 if (!rtsp_st)
410 return;
411 rtsp_st->stream_index = -1;
412 dynarray_add(&rt->rtsp_streams, &rt->nb_rtsp_streams, rtsp_st);
413
414 rtsp_st->sdp_ip = s1->default_ip;
415 rtsp_st->sdp_ttl = s1->default_ttl;
416
417 get_word(buf1, sizeof(buf1), &p); /* port */
418 rtsp_st->sdp_port = atoi(buf1);
419
420 get_word(buf1, sizeof(buf1), &p); /* protocol (ignored) */
421
422 /* XXX: handle list of formats */
423 get_word(buf1, sizeof(buf1), &p); /* format list */
424 rtsp_st->sdp_payload_type = atoi(buf1);
425
426 if (!strcmp(ff_rtp_enc_name(rtsp_st->sdp_payload_type), "MP2T")) {
427 /* no corresponding stream */
428 } else {
429 st = av_new_stream(s, 0);
430 if (!st)
431 return;
432 st->priv_data = rtsp_st;
433 rtsp_st->stream_index = st->index;
434 st->codec->codec_type = codec_type;
435 if (rtsp_st->sdp_payload_type < RTP_PT_PRIVATE) {
436 /* if standard payload type, we can find the codec right now */
437 ff_rtp_get_codec_info(st->codec, rtsp_st->sdp_payload_type);
438 }
439 }
440 /* put a default control url */
441 av_strlcpy(rtsp_st->control_url, rt->control_uri,
442 sizeof(rtsp_st->control_url));
443 break;
444 case 'a':
445 if (av_strstart(p, "control:", &p)) {
446 if (s->nb_streams == 0) {
447 if (!strncmp(p, "rtsp://", 7))
448 av_strlcpy(rt->control_uri, p,
449 sizeof(rt->control_uri));
450 } else {
451 char proto[32];
452 /* get the control url */
453 st = s->streams[s->nb_streams - 1];
454 rtsp_st = st->priv_data;
455
456 /* XXX: may need to add full url resolution */
457 ff_url_split(proto, sizeof(proto), NULL, 0, NULL, 0,
458 NULL, NULL, 0, p);
459 if (proto[0] == '\0') {
460 /* relative control URL */
461 if (rtsp_st->control_url[strlen(rtsp_st->control_url)-1]!='/')
462 av_strlcat(rtsp_st->control_url, "/",
463 sizeof(rtsp_st->control_url));
464 av_strlcat(rtsp_st->control_url, p,
465 sizeof(rtsp_st->control_url));
466 } else
467 av_strlcpy(rtsp_st->control_url, p,
468 sizeof(rtsp_st->control_url));
469 }
470 } else if (av_strstart(p, "rtpmap:", &p) && s->nb_streams > 0) {
471 /* NOTE: rtpmap is only supported AFTER the 'm=' tag */
472 get_word(buf1, sizeof(buf1), &p);
473 payload_type = atoi(buf1);
474 st = s->streams[s->nb_streams - 1];
475 rtsp_st = st->priv_data;
476 sdp_parse_rtpmap(s, st->codec, rtsp_st, payload_type, p);
477 } else if (av_strstart(p, "fmtp:", &p)) {
478 /* NOTE: fmtp is only supported AFTER the 'a=rtpmap:xxx' tag */
479 get_word(buf1, sizeof(buf1), &p);
480 payload_type = atoi(buf1);
481 for (i = 0; i < s->nb_streams; i++) {
482 st = s->streams[i];
483 rtsp_st = st->priv_data;
484 if (rtsp_st->sdp_payload_type == payload_type) {
485 if (!(rtsp_st->dynamic_handler &&
486 rtsp_st->dynamic_handler->parse_sdp_a_line &&
487 rtsp_st->dynamic_handler->parse_sdp_a_line(s,
488 i, rtsp_st->dynamic_protocol_context, buf)))
489 sdp_parse_fmtp(st, p);
490 }
491 }
492 } else if (av_strstart(p, "framesize:", &p)) {
493 // let dynamic protocol handlers have a stab at the line.
494 get_word(buf1, sizeof(buf1), &p);
495 payload_type = atoi(buf1);
496 for (i = 0; i < s->nb_streams; i++) {
497 st = s->streams[i];
498 rtsp_st = st->priv_data;
499 if (rtsp_st->sdp_payload_type == payload_type &&
500 rtsp_st->dynamic_handler &&
501 rtsp_st->dynamic_handler->parse_sdp_a_line)
502 rtsp_st->dynamic_handler->parse_sdp_a_line(s, i,
503 rtsp_st->dynamic_protocol_context, buf);
504 }
505 } else if (av_strstart(p, "range:", &p)) {
506 int64_t start, end;
507
508 // this is so that seeking on a streamed file can work.
509 rtsp_parse_range_npt(p, &start, &end);
510 s->start_time = start;
511 /* AV_NOPTS_VALUE means live broadcast (and can't seek) */
512 s->duration = (end == AV_NOPTS_VALUE) ?
513 AV_NOPTS_VALUE : end - start;
514 } else if (av_strstart(p, "IsRealDataType:integer;",&p)) {
515 if (atoi(p) == 1)
516 rt->transport = RTSP_TRANSPORT_RDT;
517 } else {
518 if (rt->server_type == RTSP_SERVER_WMS)
519 ff_wms_parse_sdp_a_line(s, p);
520 if (s->nb_streams > 0) {
521 if (rt->server_type == RTSP_SERVER_REAL)
522 ff_real_parse_sdp_a_line(s, s->nb_streams - 1, p);
523
524 rtsp_st = s->streams[s->nb_streams - 1]->priv_data;
525 if (rtsp_st->dynamic_handler &&
526 rtsp_st->dynamic_handler->parse_sdp_a_line)
527 rtsp_st->dynamic_handler->parse_sdp_a_line(s,
528 s->nb_streams - 1,
529 rtsp_st->dynamic_protocol_context, buf);
530 }
531 }
532 break;
533 }
534 }
535
536 static int sdp_parse(AVFormatContext *s, const char *content)
537 {
538 const char *p;
539 int letter;
540 /* Some SDP lines, particularly for Realmedia or ASF RTSP streams,
541 * contain long SDP lines containing complete ASF Headers (several
542 * kB) or arrays of MDPR (RM stream descriptor) headers plus
543 * "rulebooks" describing their properties. Therefore, the SDP line
544 * buffer is large.
545 *
546 * The Vorbis FMTP line can be up to 16KB - see sdp_parse_fmtp. */
547 char buf[16384], *q;
548 SDPParseState sdp_parse_state, *s1 = &sdp_parse_state;
549
550 memset(s1, 0, sizeof(SDPParseState));
551 p = content;
552 for (;;) {
553 skip_spaces(&p);
554 letter = *p;
555 if (letter == '\0')
556 break;
557 p++;
558 if (*p != '=')
559 goto next_line;
560 p++;
561 /* get the content */
562 q = buf;
563 while (*p != '\n' && *p != '\r' && *p != '\0') {
564 if ((q - buf) < sizeof(buf) - 1)
565 *q++ = *p;
566 p++;
567 }
568 *q = '\0';
569 sdp_parse_line(s, s1, letter, buf);
570 next_line:
571 while (*p != '\n' && *p != '\0')
572 p++;
573 if (*p == '\n')
574 p++;
575 }
576 return 0;
577 }
578
579 /* close and free RTSP streams */
580 void ff_rtsp_close_streams(AVFormatContext *s)
581 {
582 RTSPState *rt = s->priv_data;
583 int i;
584 RTSPStream *rtsp_st;
585
586 for (i = 0; i < rt->nb_rtsp_streams; i++) {
587 rtsp_st = rt->rtsp_streams[i];
588 if (rtsp_st) {
589 if (rtsp_st->transport_priv) {
590 if (s->oformat) {
591 AVFormatContext *rtpctx = rtsp_st->transport_priv;
592 av_write_trailer(rtpctx);
593 if (rt->lower_transport == RTSP_LOWER_TRANSPORT_TCP) {
594 uint8_t *ptr;
595 url_close_dyn_buf(rtpctx->pb, &ptr);
596 av_free(ptr);
597 } else {
598 url_fclose(rtpctx->pb);
599 }
600 av_metadata_free(&rtpctx->streams[0]->metadata);
601 av_metadata_free(&rtpctx->metadata);
602 av_free(rtpctx->streams[0]);
603 av_free(rtpctx);
604 } else if (rt->transport == RTSP_TRANSPORT_RDT)
605 ff_rdt_parse_close(rtsp_st->transport_priv);
606 else
607 rtp_parse_close(rtsp_st->transport_priv);
608 }
609 if (rtsp_st->rtp_handle)
610 url_close(rtsp_st->rtp_handle);
611 if (rtsp_st->dynamic_handler && rtsp_st->dynamic_protocol_context)
612 rtsp_st->dynamic_handler->close(
613 rtsp_st->dynamic_protocol_context);
614 }
615 }
616 av_free(rt->rtsp_streams);
617 if (rt->asf_ctx) {
618 av_close_input_stream (rt->asf_ctx);
619 rt->asf_ctx = NULL;
620 }
621 }
622
623 static void *rtsp_rtp_mux_open(AVFormatContext *s, AVStream *st,
624 URLContext *handle)
625 {
626 RTSPState *rt = s->priv_data;
627 AVFormatContext *rtpctx;
628 int ret;
629 AVOutputFormat *rtp_format = av_guess_format("rtp", NULL, NULL);
630
631 if (!rtp_format)
632 return NULL;
633
634 /* Allocate an AVFormatContext for each output stream */
635 rtpctx = avformat_alloc_context();
636 if (!rtpctx)
637 return NULL;
638
639 rtpctx->oformat = rtp_format;
640 if (!av_new_stream(rtpctx, 0)) {
641 av_free(rtpctx);
642 return NULL;
643 }
644 /* Copy the max delay setting; the rtp muxer reads this. */
645 rtpctx->max_delay = s->max_delay;
646 /* Copy other stream parameters. */
647 rtpctx->streams[0]->sample_aspect_ratio = st->sample_aspect_ratio;
648
649 /* Set the synchronized start time. */
650 rtpctx->start_time_realtime = rt->start_time;
651
652 /* Remove the local codec, link to the original codec
653 * context instead, to give the rtp muxer access to
654 * codec parameters. */
655 av_free(rtpctx->streams[0]->codec);
656 rtpctx->streams[0]->codec = st->codec;
657
658 if (handle) {
659 url_fdopen(&rtpctx->pb, handle);
660 } else
661 url_open_dyn_packet_buf(&rtpctx->pb, RTSP_TCP_MAX_PACKET_SIZE);
662 ret = av_write_header(rtpctx);
663
664 if (ret) {
665 if (handle) {
666 url_fclose(rtpctx->pb);
667 } else {
668 uint8_t *ptr;
669 url_close_dyn_buf(rtpctx->pb, &ptr);
670 av_free(ptr);
671 }
672 av_free(rtpctx->streams[0]);
673 av_free(rtpctx);
674 return NULL;
675 }
676
677 /* Copy the RTP AVStream timebase back to the original AVStream */
678 st->time_base = rtpctx->streams[0]->time_base;
679 return rtpctx;
680 }
681
682 static int rtsp_open_transport_ctx(AVFormatContext *s, RTSPStream *rtsp_st)
683 {
684 RTSPState *rt = s->priv_data;
685 AVStream *st = NULL;
686
687 /* open the RTP context */
688 if (rtsp_st->stream_index >= 0)
689 st = s->streams[rtsp_st->stream_index];
690 if (!st)
691 s->ctx_flags |= AVFMTCTX_NOHEADER;
692
693 if (s->oformat) {
694 rtsp_st->transport_priv = rtsp_rtp_mux_open(s, st, rtsp_st->rtp_handle);
695 /* Ownage of rtp_handle is passed to the rtp mux context */
696 rtsp_st->rtp_handle = NULL;
697 } else if (rt->transport == RTSP_TRANSPORT_RDT)
698 rtsp_st->transport_priv = ff_rdt_parse_open(s, st->index,
699 rtsp_st->dynamic_protocol_context,
700 rtsp_st->dynamic_handler);
701 else
702 rtsp_st->transport_priv = rtp_parse_open(s, st, rtsp_st->rtp_handle,
703 rtsp_st->sdp_payload_type,
704 &rtsp_st->rtp_payload_data);
705
706 if (!rtsp_st->transport_priv) {
707 return AVERROR(ENOMEM);
708 } else if (rt->transport != RTSP_TRANSPORT_RDT) {
709 if (rtsp_st->dynamic_handler) {
710 rtp_parse_set_dynamic_protocol(rtsp_st->transport_priv,
711 rtsp_st->dynamic_protocol_context,
712 rtsp_st->dynamic_handler);
713 }
714 }
715
716 return 0;
717 }
718
719 #if CONFIG_RTSP_DEMUXER || CONFIG_RTSP_MUXER
720 static int rtsp_probe(AVProbeData *p)
721 {
722 if (av_strstart(p->filename, "rtsp:", NULL))
723 return AVPROBE_SCORE_MAX;
724 return 0;
725 }
726
727 static void rtsp_parse_range(int *min_ptr, int *max_ptr, const char **pp)
728 {
729 const char *p;
730 int v;
731
732 p = *pp;
733 skip_spaces(&p);
734 v = strtol(p, (char **)&p, 10);
735 if (*p == '-') {
736 p++;
737 *min_ptr = v;
738 v = strtol(p, (char **)&p, 10);
739 *max_ptr = v;
740 } else {
741 *min_ptr = v;
742 *max_ptr = v;
743 }
744 *pp = p;
745 }
746
747 /* XXX: only one transport specification is parsed */
748 static void rtsp_parse_transport(RTSPMessageHeader *reply, const char *p)
749 {
750 char transport_protocol[16];
751 char profile[16];
752 char lower_transport[16];
753 char parameter[16];
754 RTSPTransportField *th;
755 char buf[256];
756
757 reply->nb_transports = 0;
758
759 for (;;) {
760 skip_spaces(&p);
761 if (*p == '\0')
762 break;
763
764 th = &reply->transports[reply->nb_transports];
765
766 get_word_sep(transport_protocol, sizeof(transport_protocol),
767 "/", &p);
768 if (!strcasecmp (transport_protocol, "rtp")) {
769 get_word_sep(profile, sizeof(profile), "/;,", &p);
770 lower_transport[0] = '\0';
771 /* rtp/avp/<protocol> */
772 if (*p == '/') {
773 get_word_sep(lower_transport, sizeof(lower_transport),
774 ";,", &p);
775 }
776 th->transport = RTSP_TRANSPORT_RTP;
777 } else if (!strcasecmp (transport_protocol, "x-pn-tng") ||
778 !strcasecmp (transport_protocol, "x-real-rdt")) {
779 /* x-pn-tng/<protocol> */
780 get_word_sep(lower_transport, sizeof(lower_transport), "/;,", &p);
781 profile[0] = '\0';
782 th->transport = RTSP_TRANSPORT_RDT;
783 }
784 if (!strcasecmp(lower_transport, "TCP"))
785 th->lower_transport = RTSP_LOWER_TRANSPORT_TCP;
786 else
787 th->lower_transport = RTSP_LOWER_TRANSPORT_UDP;
788
789 if (*p == ';')
790 p++;
791 /* get each parameter */
792 while (*p != '\0' && *p != ',') {
793 get_word_sep(parameter, sizeof(parameter), "=;,", &p);
794 if (!strcmp(parameter, "port")) {
795 if (*p == '=') {
796 p++;
797 rtsp_parse_range(&th->port_min, &th->port_max, &p);
798 }
799 } else if (!strcmp(parameter, "client_port")) {
800 if (*p == '=') {
801 p++;
802 rtsp_parse_range(&th->client_port_min,
803 &th->client_port_max, &p);
804 }
805 } else if (!strcmp(parameter, "server_port")) {
806 if (*p == '=') {
807 p++;
808 rtsp_parse_range(&th->server_port_min,
809 &th->server_port_max, &p);
810 }
811 } else if (!strcmp(parameter, "interleaved")) {
812 if (*p == '=') {
813 p++;
814 rtsp_parse_range(&th->interleaved_min,
815 &th->interleaved_max, &p);
816 }
817 } else if (!strcmp(parameter, "multicast")) {
818 if (th->lower_transport == RTSP_LOWER_TRANSPORT_UDP)
819 th->lower_transport = RTSP_LOWER_TRANSPORT_UDP_MULTICAST;
820 } else if (!strcmp(parameter, "ttl")) {
821 if (*p == '=') {
822 p++;
823 th->ttl = strtol(p, (char **)&p, 10);
824 }
825 } else if (!strcmp(parameter, "destination")) {
826 struct in_addr ipaddr;
827
828 if (*p == '=') {
829 p++;
830 get_word_sep(buf, sizeof(buf), ";,", &p);
831 if (ff_inet_aton(buf, &ipaddr))
832 th->destination = ntohl(ipaddr.s_addr);
833 }
834 }
835 while (*p != ';' && *p != '\0' && *p != ',')
836 p++;
837 if (*p == ';')
838 p++;
839 }
840 if (*p == ',')
841 p++;
842
843 reply->nb_transports++;
844 }
845 }
846
847 void ff_rtsp_parse_line(RTSPMessageHeader *reply, const char *buf,
848 HTTPAuthState *auth_state)
849 {
850 const char *p;
851
852 /* NOTE: we do case independent match for broken servers */
853 p = buf;
854 if (av_stristart(p, "Session:", &p)) {
855 int t;
856 get_word_sep(reply->session_id, sizeof(reply->session_id), ";", &p);
857 if (av_stristart(p, ";timeout=", &p) &&
858 (t = strtol(p, NULL, 10)) > 0) {
859 reply->timeout = t;
860 }
861 } else if (av_stristart(p, "Content-Length:", &p)) {
862 reply->content_length = strtol(p, NULL, 10);
863 } else if (av_stristart(p, "Transport:", &p)) {
864 rtsp_parse_transport(reply, p);
865 } else if (av_stristart(p, "CSeq:", &p)) {
866 reply->seq = strtol(p, NULL, 10);
867 } else if (av_stristart(p, "Range:", &p)) {
868 rtsp_parse_range_npt(p, &reply->range_start, &reply->range_end);
869 } else if (av_stristart(p, "RealChallenge1:", &p)) {
870 skip_spaces(&p);
871 av_strlcpy(reply->real_challenge, p, sizeof(reply->real_challenge));
872 } else if (av_stristart(p, "Server:", &p)) {
873 skip_spaces(&p);
874 av_strlcpy(reply->server, p, sizeof(reply->server));
875 } else if (av_stristart(p, "Notice:", &p) ||
876 av_stristart(p, "X-Notice:", &p)) {
877 reply->notice = strtol(p, NULL, 10);
878 } else if (av_stristart(p, "Location:", &p)) {
879 skip_spaces(&p);
880 av_strlcpy(reply->location, p , sizeof(reply->location));
881 } else if (av_stristart(p, "WWW-Authenticate:", &p) && auth_state) {
882 skip_spaces(&p);
883 ff_http_auth_handle_header(auth_state, "WWW-Authenticate", p);
884 } else if (av_stristart(p, "Authentication-Info:", &p) && auth_state) {
885 skip_spaces(&p);
886 ff_http_auth_handle_header(auth_state, "Authentication-Info", p);
887 }
888 }
889
890 /* skip a RTP/TCP interleaved packet */
891 void ff_rtsp_skip_packet(AVFormatContext *s)
892 {
893 RTSPState *rt = s->priv_data;
894 int ret, len, len1;
895 uint8_t buf[1024];
896
897 ret = url_read_complete(rt->rtsp_hd, buf, 3);
898 if (ret != 3)
899 return;
900 len = AV_RB16(buf + 1);
901
902 dprintf(s, "skipping RTP packet len=%d\n", len);
903
904 /* skip payload */
905 while (len > 0) {
906 len1 = len;
907 if (len1 > sizeof(buf))
908 len1 = sizeof(buf);
909 ret = url_read_complete(rt->rtsp_hd, buf, len1);
910 if (ret != len1)
911 return;
912 len -= len1;
913 }
914 }
915
916 int ff_rtsp_read_reply(AVFormatContext *s, RTSPMessageHeader *reply,
917 unsigned char **content_ptr,
918 int return_on_interleaved_data)
919 {
920 RTSPState *rt = s->priv_data;
921 char buf[4096], buf1[1024], *q;
922 unsigned char ch;
923 const char *p;
924 int ret, content_length, line_count = 0;
925 unsigned char *content = NULL;
926
927 memset(reply, 0, sizeof(*reply));
928
929 /* parse reply (XXX: use buffers) */
930 rt->last_reply[0] = '\0';
931 for (;;) {
932 q = buf;
933 for (;;) {
934 ret = url_read_complete(rt->rtsp_hd, &ch, 1);
935 #ifdef DEBUG_RTP_TCP
936 dprintf(s, "ret=%d c=%02x [%c]\n", ret, ch, ch);
937 #endif
938 if (ret != 1)
939 return -1;
940 if (ch == '\n')
941 break;
942 if (ch == '$') {
943 /* XXX: only parse it if first char on line ? */
944 if (return_on_interleaved_data) {
945 return 1;
946 } else
947 ff_rtsp_skip_packet(s);
948 } else if (ch != '\r') {
949 if ((q - buf) < sizeof(buf) - 1)
950 *q++ = ch;
951 }
952 }
953 *q = '\0';
954
955 dprintf(s, "line='%s'\n", buf);
956
957 /* test if last line */
958 if (buf[0] == '\0')
959 break;
960 p = buf;
961 if (line_count == 0) {
962 /* get reply code */
963 get_word(buf1, sizeof(buf1), &p);
964 get_word(buf1, sizeof(buf1), &p);
965 reply->status_code = atoi(buf1);
966 } else {
967 ff_rtsp_parse_line(reply, p, &rt->auth_state);
968 av_strlcat(rt->last_reply, p, sizeof(rt->last_reply));
969 av_strlcat(rt->last_reply, "\n", sizeof(rt->last_reply));
970 }
971 line_count++;
972 }
973
974 if (rt->session_id[0] == '\0' && reply->session_id[0] != '\0')
975 av_strlcpy(rt->session_id, reply->session_id, sizeof(rt->session_id));
976
977 content_length = reply->content_length;
978 if (content_length > 0) {
979 /* leave some room for a trailing '\0' (useful for simple parsing) */
980 content = av_malloc(content_length + 1);
981 (void)url_read_complete(rt->rtsp_hd, content, content_length);
982 content[content_length] = '\0';
983 }
984 if (content_ptr)
985 *content_ptr = content;
986 else
987 av_free(content);
988
989 if (rt->seq != reply->seq) {
990 av_log(s, AV_LOG_WARNING, "CSeq %d expected, %d received.\n",
991 rt->seq, reply->seq);
992 }
993
994 /* EOS */
995 if (reply->notice == 2101 /* End-of-Stream Reached */ ||
996 reply->notice == 2104 /* Start-of-Stream Reached */ ||
997 reply->notice == 2306 /* Continuous Feed Terminated */) {
998 rt->state = RTSP_STATE_IDLE;
999 } else if (reply->notice >= 4400 && reply->notice < 5500) {
1000 return AVERROR(EIO); /* data or server error */
1001 } else if (reply->notice == 2401 /* Ticket Expired */ ||
1002 (reply->notice >= 5500 && reply->notice < 5600) /* end of term */ )
1003 return AVERROR(EPERM);
1004
1005 return 0;
1006 }
1007
1008 void ff_rtsp_send_cmd_with_content_async(AVFormatContext *s,
1009 const char *method, const char *url,
1010 const char *headers,
1011 const unsigned char *send_content,
1012 int send_content_length)
1013 {
1014 RTSPState *rt = s->priv_data;
1015 char buf[4096];
1016
1017 rt->seq++;
1018 snprintf(buf, sizeof(buf), "%s %s RTSP/1.0\r\n", method, url);
1019 if (headers)
1020 av_strlcat(buf, headers, sizeof(buf));
1021 av_strlcatf(buf, sizeof(buf), "CSeq: %d\r\n", rt->seq);
1022 if (rt->session_id[0] != '\0' && (!headers ||
1023 !strstr(headers, "\nIf-Match:"))) {
1024 av_strlcatf(buf, sizeof(buf), "Session: %s\r\n", rt->session_id);
1025 }
1026 if (rt->auth[0]) {
1027 char *str = ff_http_auth_create_response(&rt->auth_state,
1028 rt->auth, url, method);
1029 if (str)
1030 av_strlcat(buf, str, sizeof(buf));
1031 av_free(str);
1032 }
1033 if (send_content_length > 0 && send_content)
1034 av_strlcatf(buf, sizeof(buf), "Content-Length: %d\r\n", send_content_length);
1035 av_strlcat(buf, "\r\n", sizeof(buf));
1036
1037 dprintf(s, "Sending:\n%s--\n", buf);
1038
1039 url_write(rt->rtsp_hd, buf, strlen(buf));
1040 if (send_content_length > 0 && send_content)
1041 url_write(rt->rtsp_hd, send_content, send_content_length);
1042 rt->last_cmd_time = av_gettime();
1043 }
1044
1045 void ff_rtsp_send_cmd_async(AVFormatContext *s, const char *method,
1046 const char *url, const char *headers)
1047 {
1048 ff_rtsp_send_cmd_with_content_async(s, method, url, headers, NULL, 0);
1049 }
1050
1051 void ff_rtsp_send_cmd(AVFormatContext *s, const char *method, const char *url,
1052 const char *headers, RTSPMessageHeader *reply,
1053 unsigned char **content_ptr)
1054 {
1055 ff_rtsp_send_cmd_with_content(s, method, url, headers, reply,
1056 content_ptr, NULL, 0);
1057 }
1058
1059 void ff_rtsp_send_cmd_with_content(AVFormatContext *s,
1060 const char *method, const char *url,
1061 const char *header,
1062 RTSPMessageHeader *reply,
1063 unsigned char **content_ptr,
1064 const unsigned char *send_content,
1065 int send_content_length)
1066 {
1067 RTSPState *rt = s->priv_data;
1068 HTTPAuthType cur_auth_type;
1069
1070 retry:
1071 cur_auth_type = rt->auth_state.auth_type;
1072 ff_rtsp_send_cmd_with_content_async(s, method, url, header,
1073 send_content, send_content_length);
1074
1075 ff_rtsp_read_reply(s, reply, content_ptr, 0);
1076
1077 if (reply->status_code == 401 && cur_auth_type == HTTP_AUTH_NONE &&
1078 rt->auth_state.auth_type != HTTP_AUTH_NONE)
1079 goto retry;
1080 }
1081
1082 /**
1083 * @returns 0 on success, <0 on error, 1 if protocol is unavailable.
1084 */
1085 static int make_setup_request(AVFormatContext *s, const char *host, int port,
1086 int lower_transport, const char *real_challenge)
1087 {
1088 RTSPState *rt = s->priv_data;
1089 int rtx, j, i, err, interleave = 0;
1090 RTSPStream *rtsp_st;
1091 RTSPMessageHeader reply1, *reply = &reply1;
1092 char cmd[2048];
1093 const char *trans_pref;
1094
1095 if (rt->transport == RTSP_TRANSPORT_RDT)
1096 trans_pref = "x-pn-tng";
1097 else
1098 trans_pref = "RTP/AVP";
1099
1100 /* default timeout: 1 minute */
1101 rt->timeout = 60;
1102
1103 /* for each stream, make the setup request */
1104 /* XXX: we assume the same server is used for the control of each
1105 * RTSP stream */
1106
1107 for (j = RTSP_RTP_PORT_MIN, i = 0; i < rt->nb_rtsp_streams; ++i) {
1108 char transport[2048];
1109
1110 /**
1111 * WMS serves all UDP data over a single connection, the RTX, which
1112 * isn't necessarily the first in the SDP but has to be the first
1113 * to be set up, else the second/third SETUP will fail with a 461.
1114 */
1115 if (lower_transport == RTSP_LOWER_TRANSPORT_UDP &&
1116 rt->server_type == RTSP_SERVER_WMS) {
1117 if (i == 0) {
1118 /* rtx first */
1119 for (rtx = 0; rtx < rt->nb_rtsp_streams; rtx++) {
1120 int len = strlen(rt->rtsp_streams[rtx]->control_url);
1121 if (len >= 4 &&
1122 !strcmp(rt->rtsp_streams[rtx]->control_url + len - 4,
1123 "/rtx"))
1124 break;
1125 }
1126 if (rtx == rt->nb_rtsp_streams)
1127 return -1; /* no RTX found */
1128 rtsp_st = rt->rtsp_streams[rtx];
1129 } else
1130 rtsp_st = rt->rtsp_streams[i > rtx ? i : i - 1];
1131 } else
1132 rtsp_st = rt->rtsp_streams[i];
1133
1134 /* RTP/UDP */
1135 if (lower_transport == RTSP_LOWER_TRANSPORT_UDP) {
1136 char buf[256];
1137
1138 if (rt->server_type == RTSP_SERVER_WMS && i > 1) {
1139 port = reply->transports[0].client_port_min;
1140 goto have_port;
1141 }
1142
1143 /* first try in specified port range */
1144 if (RTSP_RTP_PORT_MIN != 0) {
1145 while (j <= RTSP_RTP_PORT_MAX) {
1146 ff_url_join(buf, sizeof(buf), "rtp", NULL, host, -1,
1147 "?localport=%d", j);
1148 /* we will use two ports per rtp stream (rtp and rtcp) */
1149 j += 2;
1150 if (url_open(&rtsp_st->rtp_handle, buf, URL_RDWR) == 0)
1151 goto rtp_opened;
1152 }
1153 }
1154
1155 #if 0
1156 /* then try on any port */
1157 if (url_open(&rtsp_st->rtp_handle, "rtp://", URL_RDONLY) < 0) {
1158 err = AVERROR_INVALIDDATA;
1159 goto fail;
1160 }
1161 #endif
1162
1163 rtp_opened:
1164 port = rtp_get_local_port(rtsp_st->rtp_handle);
1165 have_port:
1166 snprintf(transport, sizeof(transport) - 1,
1167 "%s/UDP;", trans_pref);
1168 if (rt->server_type != RTSP_SERVER_REAL)
1169 av_strlcat(transport, "unicast;", sizeof(transport));
1170 av_strlcatf(transport, sizeof(transport),
1171 "client_port=%d", port);
1172 if (rt->transport == RTSP_TRANSPORT_RTP &&
1173 !(rt->server_type == RTSP_SERVER_WMS && i > 0))
1174 av_strlcatf(transport, sizeof(transport), "-%d", port + 1);
1175 }
1176
1177 /* RTP/TCP */
1178 else if (lower_transport == RTSP_LOWER_TRANSPORT_TCP) {
1179 /** For WMS streams, the application streams are only used for
1180 * UDP. When trying to set it up for TCP streams, the server
1181 * will return an error. Therefore, we skip those streams. */
1182 if (rt->server_type == RTSP_SERVER_WMS &&
1183 s->streams[rtsp_st->stream_index]->codec->codec_type ==
1184 CODEC_TYPE_DATA)
1185 continue;
1186 snprintf(transport, sizeof(transport) - 1,
1187 "%s/TCP;", trans_pref);
1188 if (rt->server_type == RTSP_SERVER_WMS)
1189 av_strlcat(transport, "unicast;", sizeof(transport));
1190 av_strlcatf(transport, sizeof(transport),
1191 "interleaved=%d-%d",
1192 interleave, interleave + 1);
1193 interleave += 2;
1194 }
1195
1196 else if (lower_transport == RTSP_LOWER_TRANSPORT_UDP_MULTICAST) {
1197 snprintf(transport, sizeof(transport) - 1,
1198 "%s/UDP;multicast", trans_pref);
1199 }
1200 if (s->oformat) {
1201 av_strlcat(transport, ";mode=receive", sizeof(transport));
1202 } else if (rt->server_type == RTSP_SERVER_REAL ||
1203 rt->server_type == RTSP_SERVER_WMS)
1204 av_strlcat(transport, ";mode=play", sizeof(transport));
1205 snprintf(cmd, sizeof(cmd),
1206 "Transport: %s\r\n",
1207 transport);
1208 if (i == 0 && rt->server_type == RTSP_SERVER_REAL) {
1209 char real_res[41], real_csum[9];
1210 ff_rdt_calc_response_and_checksum(real_res, real_csum,
1211 real_challenge);
1212 av_strlcatf(cmd, sizeof(cmd),
1213 "If-Match: %s\r\n"
1214 "RealChallenge2: %s, sd=%s\r\n",
1215 rt->session_id, real_res, real_csum);
1216 }
1217 ff_rtsp_send_cmd(s, "SETUP", rtsp_st->control_url, cmd, reply, NULL);
1218 if (reply->status_code == 461 /* Unsupported protocol */ && i == 0) {
1219 err = 1;
1220 goto fail;
1221 } else if (reply->status_code != RTSP_STATUS_OK ||
1222 reply->nb_transports != 1) {
1223 err = AVERROR_INVALIDDATA;
1224 goto fail;
1225 }
1226
1227 /* XXX: same protocol for all streams is required */
1228 if (i > 0) {
1229 if (reply->transports[0].lower_transport != rt->lower_transport ||
1230 reply->transports[0].transport != rt->transport) {
1231 err = AVERROR_INVALIDDATA;
1232 goto fail;
1233 }
1234 } else {
1235 rt->lower_transport = reply->transports[0].lower_transport;
1236 rt->transport = reply->transports[0].transport;
1237 }
1238
1239 /* close RTP connection if not choosen */
1240 if (reply->transports[0].lower_transport != RTSP_LOWER_TRANSPORT_UDP &&
1241 (lower_transport == RTSP_LOWER_TRANSPORT_UDP)) {
1242 url_close(rtsp_st->rtp_handle);
1243 rtsp_st->rtp_handle = NULL;
1244 }
1245
1246 switch(reply->transports[0].lower_transport) {
1247 case RTSP_LOWER_TRANSPORT_TCP:
1248 rtsp_st->interleaved_min = reply->transports[0].interleaved_min;
1249 rtsp_st->interleaved_max = reply->transports[0].interleaved_max;
1250 break;
1251
1252 case RTSP_LOWER_TRANSPORT_UDP: {
1253 char url[1024];
1254
1255 /* XXX: also use address if specified */
1256 ff_url_join(url, sizeof(url), "rtp", NULL, host,
1257 reply->transports[0].server_port_min, NULL);
1258 if (!(rt->server_type == RTSP_SERVER_WMS && i > 1) &&
1259 rtp_set_remote_url(rtsp_st->rtp_handle, url) < 0) {
1260 err = AVERROR_INVALIDDATA;
1261 goto fail;
1262 }
1263 /* Try to initialize the connection state in a
1264 * potential NAT router by sending dummy packets.
1265 * RTP/RTCP dummy packets are used for RDT, too.
1266 */
1267 if (!(rt->server_type == RTSP_SERVER_WMS && i > 1) && s->iformat)
1268 rtp_send_punch_packets(rtsp_st->rtp_handle);
1269 break;
1270 }
1271 case RTSP_LOWER_TRANSPORT_UDP_MULTICAST: {
1272 char url[1024];
1273 struct in_addr in;
1274 int port, ttl;
1275
1276 if (reply->transports[0].destination) {
1277 in.s_addr = htonl(reply->transports[0].destination);
1278 port = reply->transports[0].port_min;
1279 ttl = reply->transports[0].ttl;
1280 } else {
1281 in = rtsp_st->sdp_ip;
1282 port = rtsp_st->sdp_port;
1283 ttl = rtsp_st->sdp_ttl;
1284 }
1285 ff_url_join(url, sizeof(url), "rtp", NULL, inet_ntoa(in),
1286 port, "?ttl=%d", ttl);
1287 if (url_open(&rtsp_st->rtp_handle, url, URL_RDWR) < 0) {
1288 err = AVERROR_INVALIDDATA;
1289 goto fail;
1290 }
1291 break;
1292 }
1293 }
1294
1295 if ((err = rtsp_open_transport_ctx(s, rtsp_st)))
1296 goto fail;
1297 }
1298
1299 if (reply->timeout > 0)
1300 rt->timeout = reply->timeout;
1301
1302 if (rt->server_type == RTSP_SERVER_REAL)
1303 rt->need_subscription = 1;
1304
1305 return 0;
1306
1307 fail:
1308 for (i = 0; i < rt->nb_rtsp_streams; i++) {
1309 if (rt->rtsp_streams[i]->rtp_handle) {
1310 url_close(rt->rtsp_streams[i]->rtp_handle);
1311 rt->rtsp_streams[i]->rtp_handle = NULL;
1312 }
1313 }
1314 return err;
1315 }
1316
1317 static int rtsp_read_play(AVFormatContext *s)
1318 {
1319 RTSPState *rt = s->priv_data;
1320 RTSPMessageHeader reply1, *reply = &reply1;
1321 char cmd[1024];
1322
1323 av_log(s, AV_LOG_DEBUG, "hello state=%d\n", rt->state);
1324
1325 if (!(rt->server_type == RTSP_SERVER_REAL && rt->need_subscription)) {
1326 if (rt->state == RTSP_STATE_PAUSED) {
1327 cmd[0] = 0;
1328 } else {
1329 snprintf(cmd, sizeof(cmd),
1330 "Range: npt=%0.3f-\r\n",
1331 (double)rt->seek_timestamp / AV_TIME_BASE);
1332 }
1333 ff_rtsp_send_cmd(s, "PLAY", rt->control_uri, cmd, reply, NULL);
1334 if (reply->status_code != RTSP_STATUS_OK) {
1335 return -1;
1336 }
1337 }
1338 rt->state = RTSP_STATE_STREAMING;
1339 return 0;
1340 }
1341
1342 static int rtsp_setup_input_streams(AVFormatContext *s, RTSPMessageHeader *reply)
1343 {
1344 RTSPState *rt = s->priv_data;
1345 char cmd[1024];
1346 unsigned char *content = NULL;
1347 int ret;
1348
1349 /* describe the stream */
1350 snprintf(cmd, sizeof(cmd),
1351 "Accept: application/sdp\r\n");
1352 if (rt->server_type == RTSP_SERVER_REAL) {
1353 /**
1354 * The Require: attribute is needed for proper streaming from
1355 * Realmedia servers.
1356 */
1357 av_strlcat(cmd,
1358 "Require: com.real.retain-entity-for-setup\r\n",
1359 sizeof(cmd));
1360 }
1361 ff_rtsp_send_cmd(s, "DESCRIBE", rt->control_uri, cmd, reply, &content);
1362 if (!content)
1363 return AVERROR_INVALIDDATA;
1364 if (reply->status_code != RTSP_STATUS_OK) {
1365 av_freep(&content);
1366 return AVERROR_INVALIDDATA;
1367 }
1368
1369 /* now we got the SDP description, we parse it */
1370 ret = sdp_parse(s, (const char *)content);
1371 av_freep(&content);
1372 if (ret < 0)
1373 return AVERROR_INVALIDDATA;
1374
1375 return 0;
1376 }
1377
1378 static int rtsp_setup_output_streams(AVFormatContext *s, const char *addr)
1379 {
1380 RTSPState *rt = s->priv_data;
1381 RTSPMessageHeader reply1, *reply = &reply1;
1382 int i;
1383 char *sdp;
1384 AVFormatContext sdp_ctx, *ctx_array[1];
1385
1386 rt->start_time = av_gettime();
1387
1388 /* Announce the stream */
1389 sdp = av_mallocz(8192);
1390 if (sdp == NULL)
1391 return AVERROR(ENOMEM);
1392 /* We create the SDP based on the RTSP AVFormatContext where we
1393 * aren't allowed to change the filename field. (We create the SDP
1394 * based on the RTSP context since the contexts for the RTP streams
1395 * don't exist yet.) In order to specify a custom URL with the actual
1396 * peer IP instead of the originally specified hostname, we create
1397 * a temporary copy of the AVFormatContext, where the custom URL is set.
1398 *
1399 * FIXME: Create the SDP without copying the AVFormatContext.
1400 * This either requires setting up the RTP stream AVFormatContexts
1401 * already here (complicating things immensely) or getting a more
1402 * flexible SDP creation interface.
1403 */
1404 sdp_ctx = *s;
1405 ff_url_join(sdp_ctx.filename, sizeof(sdp_ctx.filename),
1406 "rtsp", NULL, addr, -1, NULL);
1407 ctx_array[0] = &sdp_ctx;
1408 if (avf_sdp_create(ctx_array, 1, sdp, 8192)) {
1409 av_free(sdp);
1410 return AVERROR_INVALIDDATA;
1411 }
1412 av_log(s, AV_LOG_INFO, "SDP:\n%s\n", sdp);
1413 ff_rtsp_send_cmd_with_content(s, "ANNOUNCE", rt->control_uri,
1414 "Content-Type: application/sdp\r\n",
1415 reply, NULL, sdp, strlen(sdp));
1416 av_free(sdp);
1417 if (reply->status_code != RTSP_STATUS_OK)
1418 return AVERROR_INVALIDDATA;
1419
1420 /* Set up the RTSPStreams for each AVStream */
1421 for (i = 0; i < s->nb_streams; i++) {
1422 RTSPStream *rtsp_st;
1423 AVStream *st = s->streams[i];
1424
1425 rtsp_st = av_mallocz(sizeof(RTSPStream));
1426 if (!rtsp_st)
1427 return AVERROR(ENOMEM);
1428 dynarray_add(&rt->rtsp_streams, &rt->nb_rtsp_streams, rtsp_st);
1429
1430 st->priv_data = rtsp_st;
1431 rtsp_st->stream_index = i;
1432
1433 av_strlcpy(rtsp_st->control_url, rt->control_uri, sizeof(rtsp_st->control_url));
1434 /* Note, this must match the relative uri set in the sdp content */
1435 av_strlcatf(rtsp_st->control_url, sizeof(rtsp_st->control_url),
1436 "/streamid=%d", i);
1437 }
1438
1439 return 0;
1440 }
1441
1442 int ff_rtsp_connect(AVFormatContext *s)
1443 {
1444 RTSPState *rt = s->priv_data;
1445 char host[1024], path[1024], tcpname[1024], cmd[2048], auth[128];
1446 char *option_list, *option, *filename;
1447 URLContext *rtsp_hd;
1448 int port, err, tcp_fd;
1449 RTSPMessageHeader reply1, *reply = &reply1;
1450 int lower_transport_mask = 0;
1451 char real_challenge[64];
1452 struct sockaddr_storage peer;
1453 socklen_t peer_len = sizeof(peer);
1454
1455 if (!ff_network_init())
1456 return AVERROR(EIO);
1457 redirect:
1458 /* extract hostname and port */
1459 ff_url_split(NULL, 0, auth, sizeof(auth),
1460 host, sizeof(host), &port, path, sizeof(path), s->filename);
1461 if (*auth) {
1462 av_strlcpy(rt->auth, auth, sizeof(rt->auth));
1463 }
1464 if (port < 0)
1465 port = RTSP_DEFAULT_PORT;
1466
1467 /* search for options */
1468 option_list = strrchr(path, '?');
1469 if (option_list) {
1470 /* Strip out the RTSP specific options, write out the rest of
1471 * the options back into the same string. */
1472 filename = option_list;
1473 while (option_list) {
1474 /* move the option pointer */
1475 option = ++option_list;
1476 option_list = strchr(option_list, '&');
1477 if (option_list)
1478 *option_list = 0;
1479
1480 /* handle the options */
1481 if (!strcmp(option, "udp")) {
1482 lower_transport_mask |= (1<< RTSP_LOWER_TRANSPORT_UDP);
1483 } else if (!strcmp(option, "multicast")) {
1484 lower_transport_mask |= (1<< RTSP_LOWER_TRANSPORT_UDP_MULTICAST);
1485 } else if (!strcmp(option, "tcp")) {
1486 lower_transport_mask |= (1<< RTSP_LOWER_TRANSPORT_TCP);
1487 } else {
1488 /* Write options back into the buffer, using memmove instead
1489 * of strcpy since the strings may overlap. */
1490 int len = strlen(option);
1491 memmove(++filename, option, len);
1492 filename += len;
1493 if (option_list) *filename = '&';
1494 }
1495 }
1496 *filename = 0;
1497 }
1498
1499 if (!lower_transport_mask)
1500 lower_transport_mask = (1 << RTSP_LOWER_TRANSPORT_NB) - 1;
1501
1502 if (s->oformat) {
1503 /* Only UDP or TCP - UDP multicast isn't supported. */
1504 lower_transport_mask &= (1 << RTSP_LOWER_TRANSPORT_UDP) |
1505 (1 << RTSP_LOWER_TRANSPORT_TCP);
1506 if (!lower_transport_mask) {
1507 av_log(s, AV_LOG_ERROR, "Unsupported lower transport method, "
1508 "only UDP and TCP are supported for output.\n");
1509 err = AVERROR(EINVAL);
1510 goto fail;
1511 }
1512 }
1513
1514 /* Construct the URI used in request; this is similar to s->filename,
1515 * but with authentication credentials removed and RTSP specific options
1516 * stripped out. */
1517 ff_url_join(rt->control_uri, sizeof(rt->control_uri), "rtsp", NULL,
1518 host, port, "%s", path);
1519
1520 /* open the tcp connexion */
1521 ff_url_join(tcpname, sizeof(tcpname), "tcp", NULL, host, port, NULL);
1522 if (url_open(&rtsp_hd, tcpname, URL_RDWR) < 0) {
1523 err = AVERROR(EIO);
1524 goto fail;
1525 }
1526 rt->rtsp_hd = rtsp_hd;
1527 rt->seq = 0;
1528
1529 tcp_fd = url_get_file_handle(rtsp_hd);
1530 if (!getpeername(tcp_fd, (struct sockaddr*) &peer, &peer_len)) {
1531 getnameinfo((struct sockaddr*) &peer, peer_len, host, sizeof(host),
1532 NULL, 0, NI_NUMERICHOST);
1533 }
1534
1535 /* request options supported by the server; this also detects server
1536 * type */
1537 for (rt->server_type = RTSP_SERVER_RTP;;) {
1538 cmd[0] = 0;
1539 if (rt->server_type == RTSP_SERVER_REAL)
1540 av_strlcat(cmd,
1541 /**
1542 * The following entries are required for proper
1543 * streaming from a Realmedia server. They are
1544 * interdependent in some way although we currently
1545 * don't quite understand how. Values were copied
1546 * from mplayer SVN r23589.
1547 * @param CompanyID is a 16-byte ID in base64
1548 * @param ClientChallenge is a 16-byte ID in hex
1549 */
1550 "ClientChallenge: 9e26d33f2984236010ef6253fb1887f7\r\n"
1551 "PlayerStarttime: [28/03/2003:22:50:23 00:00]\r\n"
1552 "CompanyID: KnKV4M4I/B2FjJ1TToLycw==\r\n"
1553 "GUID: 00000000-0000-0000-0000-000000000000\r\n",
1554 sizeof(cmd));
1555 ff_rtsp_send_cmd(s, "OPTIONS", rt->control_uri, cmd, reply, NULL);
1556 if (reply->status_code != RTSP_STATUS_OK) {
1557 err = AVERROR_INVALIDDATA;
1558 goto fail;
1559 }
1560
1561 /* detect server type if not standard-compliant RTP */
1562 if (rt->server_type != RTSP_SERVER_REAL && reply->real_challenge[0]) {
1563 rt->server_type = RTSP_SERVER_REAL;
1564 continue;
1565 } else if (!strncasecmp(reply->server, "WMServer/", 9)) {
1566 rt->server_type = RTSP_SERVER_WMS;
1567 } else if (rt->server_type == RTSP_SERVER_REAL)
1568 strcpy(real_challenge, reply->real_challenge);
1569 break;
1570 }
1571
1572 if (s->iformat)
1573 err = rtsp_setup_input_streams(s, reply);
1574 else
1575 err = rtsp_setup_output_streams(s, host);
1576 if (err)
1577 goto fail;
1578
1579 do {
1580 int lower_transport = ff_log2_tab[lower_transport_mask &
1581 ~(lower_transport_mask - 1)];
1582
1583 err = make_setup_request(s, host, port, lower_transport,
1584 rt->server_type == RTSP_SERVER_REAL ?
1585 real_challenge : NULL);
1586 if (err < 0)
1587 goto fail;
1588 lower_transport_mask &= ~(1 << lower_transport);
1589 if (lower_transport_mask == 0 && err == 1) {
1590 err = AVERROR(FF_NETERROR(EPROTONOSUPPORT));
1591 goto fail;
1592 }
1593 } while (err);
1594
1595 rt->state = RTSP_STATE_IDLE;
1596 rt->seek_timestamp = 0; /* default is to start stream at position zero */
1597 return 0;
1598 fail:
1599 ff_rtsp_close_streams(s);
1600 url_close(rt->rtsp_hd);
1601 if (reply->status_code >=300 && reply->status_code < 400 && s->iformat) {
1602 av_strlcpy(s->filename, reply->location, sizeof(s->filename));
1603 av_log(s, AV_LOG_INFO, "Status %d: Redirecting to %s\n",
1604 reply->status_code,
1605 s->filename);
1606 goto redirect;
1607 }
1608 ff_network_close();
1609 return err;
1610 }
1611 #endif
1612
1613 #if CONFIG_RTSP_DEMUXER
1614 static int rtsp_read_header(AVFormatContext *s,
1615 AVFormatParameters *ap)
1616 {
1617 RTSPState *rt = s->priv_data;
1618 int ret;
1619
1620 ret = ff_rtsp_connect(s);
1621 if (ret)
1622 return ret;
1623
1624 if (ap->initial_pause) {
1625 /* do not start immediately */
1626 } else {
1627 if (rtsp_read_play(s) < 0) {
1628 ff_rtsp_close_streams(s);
1629 url_close(rt->rtsp_hd);
1630 return AVERROR_INVALIDDATA;
1631 }
1632 }
1633
1634 return 0;
1635 }
1636
1637 static int udp_read_packet(AVFormatContext *s, RTSPStream **prtsp_st,
1638 uint8_t *buf, int buf_size)
1639 {
1640 RTSPState *rt = s->priv_data;
1641 RTSPStream *rtsp_st;
1642 fd_set rfds;
1643 int fd, fd_max, n, i, ret, tcp_fd, timeout_cnt = 0;
1644 struct timeval tv;
1645
1646 for (;;) {
1647 if (url_interrupt_cb())
1648 return AVERROR(EINTR);
1649 FD_ZERO(&rfds);
1650 if (rt->rtsp_hd) {
1651 tcp_fd = fd_max = url_get_file_handle(rt->rtsp_hd);
1652 FD_SET(tcp_fd, &rfds);
1653 } else {
1654 fd_max = 0;
1655 tcp_fd = -1;
1656 }
1657 for (i = 0; i < rt->nb_rtsp_streams; i++) {
1658 rtsp_st = rt->rtsp_streams[i];
1659 if (rtsp_st->rtp_handle) {
1660 /* currently, we cannot probe RTCP handle because of
1661 * blocking restrictions */
1662 fd = url_get_file_handle(rtsp_st->rtp_handle);
1663 if (fd > fd_max)
1664 fd_max = fd;
1665 FD_SET(fd, &rfds);
1666 }
1667 }
1668 tv.tv_sec = 0;
1669 tv.tv_usec = SELECT_TIMEOUT_MS * 1000;
1670 n = select(fd_max + 1, &rfds, NULL, NULL, &tv);
1671 if (n > 0) {
1672 timeout_cnt = 0;
1673 for (i = 0; i < rt->nb_rtsp_streams; i++) {
1674 rtsp_st = rt->rtsp_streams[i];
1675 if (rtsp_st->rtp_handle) {
1676 fd = url_get_file_handle(rtsp_st->rtp_handle);
1677 if (FD_ISSET(fd, &rfds)) {
1678 ret = url_read(rtsp_st->rtp_handle, buf, buf_size);
1679 if (ret > 0) {
1680 *prtsp_st = rtsp_st;
1681 return ret;
1682 }
1683 }
1684 }
1685 }
1686 #if CONFIG_RTSP_DEMUXER
1687 if (tcp_fd != -1 && FD_ISSET(tcp_fd, &rfds)) {
1688 RTSPMessageHeader reply;
1689
1690 ret = ff_rtsp_read_reply(s, &reply, NULL, 0);
1691 if (ret < 0)
1692 return ret;
1693 /* XXX: parse message */
1694 if (rt->state != RTSP_STATE_STREAMING)
1695 return 0;
1696 }
1697 #endif
1698 } else if (n == 0 && ++timeout_cnt >= MAX_TIMEOUTS) {
1699 return AVERROR(ETIME);
1700 } else if (n < 0 && errno != EINTR)
1701 return AVERROR(errno);
1702 }
1703 }
1704
1705 static int tcp_read_packet(AVFormatContext *s, RTSPStream **prtsp_st,
1706 uint8_t *buf, int buf_size)
1707 {
1708 RTSPState *rt = s->priv_data;
1709 int id, len, i, ret;
1710 RTSPStream *rtsp_st;
1711
1712 #ifdef DEBUG_RTP_TCP
1713 dprintf(s, "tcp_read_packet:\n");
1714 #endif
1715 redo:
1716 for (;;) {
1717 RTSPMessageHeader reply;
1718
1719 ret = ff_rtsp_read_reply(s, &reply, NULL, 1);
1720 if (ret == -1)
1721 return -1;
1722 if (ret == 1) /* received '$' */
1723 break;
1724 /* XXX: parse message */
1725 if (rt->state != RTSP_STATE_STREAMING)
1726 return 0;
1727 }
1728 ret = url_read_complete(rt->rtsp_hd, buf, 3);
1729 if (ret != 3)
1730 return -1;
1731 id = buf[0];
1732 len = AV_RB16(buf + 1);
1733 #ifdef DEBUG_RTP_TCP
1734 dprintf(s, "id=%d len=%d\n", id, len);
1735 #endif
1736 if (len > buf_size || len < 12)
1737 goto redo;
1738 /* get the data */
1739 ret = url_read_complete(rt->rtsp_hd, buf, len);
1740 if (ret != len)
1741 return -1;
1742 if (rt->transport == RTSP_TRANSPORT_RDT &&
1743 ff_rdt_parse_header(buf, len, &id, NULL, NULL, NULL, NULL) < 0)
1744 return -1;
1745
1746 /* find the matching stream */
1747 for (i = 0; i < rt->nb_rtsp_streams; i++) {
1748 rtsp_st = rt->rtsp_streams[i];
1749 if (id >= rtsp_st->interleaved_min &&
1750 id <= rtsp_st->interleaved_max)
1751 goto found;
1752 }
1753 goto redo;
1754 found:
1755 *prtsp_st = rtsp_st;
1756 return len;
1757 }
1758
1759 static int rtsp_fetch_packet(AVFormatContext *s, AVPacket *pkt)
1760 {
1761 RTSPState *rt = s->priv_data;
1762 int ret, len;
1763 uint8_t buf[10 * RTP_MAX_PACKET_LENGTH];
1764 RTSPStream *rtsp_st;
1765
1766 /* get next frames from the same RTP packet */
1767 if (rt->cur_transport_priv) {
1768 if (rt->transport == RTSP_TRANSPORT_RDT) {
1769 ret = ff_rdt_parse_packet(rt->cur_transport_priv, pkt, NULL, 0);
1770 } else
1771 ret = rtp_parse_packet(rt->cur_transport_priv, pkt, NULL, 0);
1772 if (ret == 0) {
1773 rt->cur_transport_priv = NULL;
1774 return 0;
1775 } else if (ret == 1) {
1776 return 0;
1777 } else
1778 rt->cur_transport_priv = NULL;
1779 }
1780
1781 /* read next RTP packet */
1782 redo:
1783 switch(rt->lower_transport) {
1784 default:
1785 #if CONFIG_RTSP_DEMUXER
1786 case RTSP_LOWER_TRANSPORT_TCP:
1787 len = tcp_read_packet(s, &rtsp_st, buf, sizeof(buf));
1788 break;
1789 #endif
1790 case RTSP_LOWER_TRANSPORT_UDP:
1791 case RTSP_LOWER_TRANSPORT_UDP_MULTICAST:
1792 len = udp_read_packet(s, &rtsp_st, buf, sizeof(buf));
1793 if (len >=0 && rtsp_st->transport_priv && rt->transport == RTSP_TRANSPORT_RTP)
1794 rtp_check_and_send_back_rr(rtsp_st->transport_priv, len);
1795 break;
1796 }
1797 if (len < 0)
1798 return len;
1799 if (len == 0)
1800 return AVERROR_EOF;
1801 if (rt->transport == RTSP_TRANSPORT_RDT) {
1802 ret = ff_rdt_parse_packet(rtsp_st->transport_priv, pkt, buf, len);
1803 } else
1804 ret = rtp_parse_packet(rtsp_st->transport_priv, pkt, buf, len);
1805 if (ret < 0)
1806 goto redo;
1807 if (ret == 1)
1808 /* more packets may follow, so we save the RTP context */
1809 rt->cur_transport_priv = rtsp_st->transport_priv;
1810
1811 return ret;
1812 }
1813
1814 static int rtsp_read_packet(AVFormatContext *s, AVPacket *pkt)
1815 {
1816 RTSPState *rt = s->priv_data;
1817 int ret;
1818 RTSPMessageHeader reply1, *reply = &reply1;
1819 char cmd[1024];
1820
1821 if (rt->server_type == RTSP_SERVER_REAL) {
1822 int i;
1823 enum AVDiscard cache[MAX_STREAMS];
1824
1825 for (i = 0; i < s->nb_streams; i++)
1826 cache[i] = s->streams[i]->discard;
1827
1828 if (!rt->need_subscription) {
1829 if (memcmp (cache, rt->real_setup_cache,
1830 sizeof(enum AVDiscard) * s->nb_streams)) {
1831 snprintf(cmd, sizeof(cmd),
1832 "Unsubscribe: %s\r\n",
1833 rt->last_subscription);
1834 ff_rtsp_send_cmd(s, "SET_PARAMETER", rt->control_uri,
1835 cmd, reply, NULL);
1836 if (reply->status_code != RTSP_STATUS_OK)
1837 return AVERROR_INVALIDDATA;
1838 rt->need_subscription = 1;
1839 }
1840 }
1841
1842 if (rt->need_subscription) {
1843 int r, rule_nr, first = 1;
1844
1845 memcpy(rt->real_setup_cache, cache,
1846 sizeof(enum AVDiscard) * s->nb_streams);
1847 rt->last_subscription[0] = 0;
1848
1849 snprintf(cmd, sizeof(cmd),
1850 "Subscribe: ");
1851 for (i = 0; i < rt->nb_rtsp_streams; i++) {
1852 rule_nr = 0;
1853 for (r = 0; r < s->nb_streams; r++) {
1854 if (s->streams[r]->priv_data == rt->rtsp_streams[i]) {
1855 if (s->streams[r]->discard != AVDISCARD_ALL) {
1856 if (!first)
1857 av_strlcat(rt->last_subscription, ",",
1858 sizeof(rt->last_subscription));
1859 ff_rdt_subscribe_rule(
1860 rt->last_subscription,
1861 sizeof(rt->last_subscription), i, rule_nr);
1862 first = 0;
1863 }
1864 rule_nr++;
1865 }
1866 }
1867 }
1868 av_strlcatf(cmd, sizeof(cmd), "%s\r\n", rt->last_subscription);
1869 ff_rtsp_send_cmd(s, "SET_PARAMETER", rt->control_uri,
1870 cmd, reply, NULL);
1871 if (reply->status_code != RTSP_STATUS_OK)
1872 return AVERROR_INVALIDDATA;
1873 rt->need_subscription = 0;
1874
1875 if (rt->state == RTSP_STATE_STREAMING)
1876 rtsp_read_play (s);
1877 }
1878 }
1879
1880 ret = rtsp_fetch_packet(s, pkt);
1881 if (ret < 0)
1882 return ret;
1883
1884 /* send dummy request to keep TCP connection alive */
1885 if ((rt->server_type == RTSP_SERVER_WMS ||
1886 rt->server_type == RTSP_SERVER_REAL) &&
1887 (av_gettime() - rt->last_cmd_time) / 1000000 >= rt->timeout / 2) {
1888 if (rt->server_type == RTSP_SERVER_WMS) {
1889 ff_rtsp_send_cmd_async(s, "GET_PARAMETER", rt->control_uri, NULL);
1890 } else {
1891 ff_rtsp_send_cmd_async(s, "OPTIONS", "*", NULL);
1892 }
1893 }
1894
1895 return 0;
1896 }
1897
1898 /* pause the stream */
1899 static int rtsp_read_pause(AVFormatContext *s)
1900 {
1901 RTSPState *rt = s->priv_data;
1902 RTSPMessageHeader reply1, *reply = &reply1;
1903
1904 rt = s->priv_data;
1905
1906 if (rt->state != RTSP_STATE_STREAMING)
1907 return 0;
1908 else if (!(rt->server_type == RTSP_SERVER_REAL && rt->need_subscription)) {
1909 ff_rtsp_send_cmd(s, "PAUSE", rt->control_uri, NULL, reply, NULL);
1910 if (reply->status_code != RTSP_STATUS_OK) {
1911 return -1;
1912 }
1913 }
1914 rt->state = RTSP_STATE_PAUSED;
1915 return 0;
1916 }
1917
1918 static int rtsp_read_seek(AVFormatContext *s, int stream_index,
1919 int64_t timestamp, int flags)
1920 {
1921 RTSPState *rt = s->priv_data;
1922
1923 rt->seek_timestamp = av_rescale_q(timestamp,
1924 s->streams[stream_index]->time_base,
1925 AV_TIME_BASE_Q);
1926 switch(rt->state) {
1927 default:
1928 case RTSP_STATE_IDLE:
1929 break;
1930 case RTSP_STATE_STREAMING:
1931 if (rtsp_read_pause(s) != 0)
1932 return -1;
1933 rt->state = RTSP_STATE_SEEKING;
1934 if (rtsp_read_play(s) != 0)
1935 return -1;
1936 break;
1937 case RTSP_STATE_PAUSED:
1938 rt->state = RTSP_STATE_IDLE;
1939 break;
1940 }
1941 return 0;
1942 }
1943
1944 static int rtsp_read_close(AVFormatContext *s)
1945 {
1946 RTSPState *rt = s->priv_data;
1947
1948 #if 0
1949 /* NOTE: it is valid to flush the buffer here */
1950 if (rt->lower_transport == RTSP_LOWER_TRANSPORT_TCP) {
1951 url_fclose(&rt->rtsp_gb);
1952 }
1953 #endif
1954 ff_rtsp_send_cmd_async(s, "TEARDOWN", rt->control_uri, NULL);
1955
1956 ff_rtsp_close_streams(s);
1957 url_close(rt->rtsp_hd);
1958 ff_network_close();
1959 return 0;
1960 }
1961
1962 AVInputFormat rtsp_demuxer = {
1963 "rtsp",
1964 NULL_IF_CONFIG_SMALL("RTSP input format"),
1965 sizeof(RTSPState),
1966 rtsp_probe,
1967 rtsp_read_header,
1968 rtsp_read_packet,
1969 rtsp_read_close,
1970 rtsp_read_seek,
1971 .flags = AVFMT_NOFILE,
1972 .read_play = rtsp_read_play,
1973 .read_pause = rtsp_read_pause,
1974 };
1975 #endif
1976
1977 static int sdp_probe(AVProbeData *p1)
1978 {
1979 const char *p = p1->buf, *p_end = p1->buf + p1->buf_size;
1980
1981 /* we look for a line beginning "c=IN IP4" */
1982 while (p < p_end && *p != '\0') {
1983 if (p + sizeof("c=IN IP4") - 1 < p_end &&
1984 av_strstart(p, "c=IN IP4", NULL))
1985 return AVPROBE_SCORE_MAX / 2;
1986
1987 while (p < p_end - 1 && *p != '\n') p++;
1988 if (++p >= p_end)
1989 break;
1990 if (*p == '\r')
1991 p++;
1992 }
1993 return 0;
1994 }
1995
1996 #define SDP_MAX_SIZE 8192
1997
1998 static int sdp_read_header(AVFormatContext *s, AVFormatParameters *ap)
1999 {
2000 RTSPState *rt = s->priv_data;
2001 RTSPStream *rtsp_st;
2002 int size, i, err;
2003 char *content;
2004 char url[1024];
2005
2006 if (!ff_network_init())
2007 return AVERROR(EIO);
2008
2009 /* read the whole sdp file */
2010 /* XXX: better loading */
2011 content = av_malloc(SDP_MAX_SIZE);
2012 size = get_buffer(s->pb, content, SDP_MAX_SIZE - 1);
2013 if (size <= 0) {
2014 av_free(content);
2015 return AVERROR_INVALIDDATA;
2016 }
2017 content[size] ='\0';
2018
2019 sdp_parse(s, content);
2020 av_free(content);
2021
2022 /* open each RTP stream */
2023 for (i = 0; i < rt->nb_rtsp_streams; i++) {
2024 rtsp_st = rt->rtsp_streams[i];
2025
2026 ff_url_join(url, sizeof(url), "rtp", NULL,
2027 inet_ntoa(rtsp_st->sdp_ip), rtsp_st->sdp_port,
2028 "?localport=%d&ttl=%d", rtsp_st->sdp_port,
2029 rtsp_st->sdp_ttl);
2030 if (url_open(&rtsp_st->rtp_handle, url, URL_RDWR) < 0) {
2031 err = AVERROR_INVALIDDATA;
2032 goto fail;
2033 }
2034 if ((err = rtsp_open_transport_ctx(s, rtsp_st)))
2035 goto fail;
2036 }
2037 return 0;
2038 fail:
2039 ff_rtsp_close_streams(s);
2040 ff_network_close();
2041 return err;
2042 }
2043
2044 static int sdp_read_close(AVFormatContext *s)
2045 {
2046 ff_rtsp_close_streams(s);
2047 ff_network_close();
2048 return 0;
2049 }
2050
2051 AVInputFormat sdp_demuxer = {
2052 "sdp",
2053 NULL_IF_CONFIG_SMALL("SDP"),
2054 sizeof(RTSPState),
2055 sdp_probe,
2056 sdp_read_header,
2057 rtsp_fetch_packet,
2058 sdp_read_close,
2059 };