Remove useless "else" case in if X { A; return }; else { B }. See discussion
[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/avstring.h"
26 #include "avformat.h"
27
28 #include <sys/time.h>
29 #include <unistd.h> /* for select() prototype */
30 #include <strings.h>
31 #include "network.h"
32 #include "rtsp.h"
33
34 #include "rtp_internal.h"
35
36 //#define DEBUG
37 //#define DEBUG_RTP_TCP
38
39 enum RTSPClientState {
40 RTSP_STATE_IDLE,
41 RTSP_STATE_PLAYING,
42 RTSP_STATE_PAUSED,
43 };
44
45 enum RTSPServerType {
46 RTSP_SERVER_RTP, /*< Standard-compliant RTP-server */
47 RTSP_SERVER_RDT, /*< Realmedia-style server */
48 RTSP_SERVER_LAST
49 };
50
51 typedef struct RTSPState {
52 URLContext *rtsp_hd; /* RTSP TCP connexion handle */
53 int nb_rtsp_streams;
54 struct RTSPStream **rtsp_streams;
55
56 enum RTSPClientState state;
57 int64_t seek_timestamp;
58
59 /* XXX: currently we use unbuffered input */
60 // ByteIOContext rtsp_gb;
61 int seq; /* RTSP command sequence number */
62 char session_id[512];
63 enum RTSPProtocol protocol;
64 enum RTSPServerType server_type;
65 char last_reply[2048]; /* XXX: allocate ? */
66 RTPDemuxContext *cur_rtp;
67 } RTSPState;
68
69 typedef struct RTSPStream {
70 URLContext *rtp_handle; /* RTP stream handle */
71 RTPDemuxContext *rtp_ctx; /* RTP parse context */
72
73 int stream_index; /* corresponding stream index, if any. -1 if none (MPEG2TS case) */
74 int interleaved_min, interleaved_max; /* interleave ids, if TCP transport */
75 char control_url[1024]; /* url for this stream (from SDP) */
76
77 int sdp_port; /* port (from SDP content - not used in RTSP) */
78 struct in_addr sdp_ip; /* IP address (from SDP content - not used in RTSP) */
79 int sdp_ttl; /* IP TTL (from SDP content - not used in RTSP) */
80 int sdp_payload_type; /* payload type - only used in SDP */
81 rtp_payload_data_t rtp_payload_data; /* rtp payload parsing infos from SDP */
82
83 RTPDynamicProtocolHandler *dynamic_handler; ///< Only valid if it's a dynamic protocol. (This is the handler structure)
84 void *dynamic_protocol_context; ///< Only valid if it's a dynamic protocol. (This is any private data associated with the dynamic protocol)
85 } RTSPStream;
86
87 static int rtsp_read_play(AVFormatContext *s);
88
89 /* XXX: currently, the only way to change the protocols consists in
90 changing this variable */
91
92 #if LIBAVFORMAT_VERSION_INT < (53 << 16)
93 int rtsp_default_protocols = (1 << RTSP_PROTOCOL_RTP_UDP);
94 #endif
95
96 static int rtsp_probe(AVProbeData *p)
97 {
98 if (av_strstart(p->filename, "rtsp:", NULL))
99 return AVPROBE_SCORE_MAX;
100 return 0;
101 }
102
103 static int redir_isspace(int c)
104 {
105 return c == ' ' || c == '\t' || c == '\n' || c == '\r';
106 }
107
108 static void skip_spaces(const char **pp)
109 {
110 const char *p;
111 p = *pp;
112 while (redir_isspace(*p))
113 p++;
114 *pp = p;
115 }
116
117 static void get_word_sep(char *buf, int buf_size, const char *sep,
118 const char **pp)
119 {
120 const char *p;
121 char *q;
122
123 p = *pp;
124 if (*p == '/')
125 p++;
126 skip_spaces(&p);
127 q = buf;
128 while (!strchr(sep, *p) && *p != '\0') {
129 if ((q - buf) < buf_size - 1)
130 *q++ = *p;
131 p++;
132 }
133 if (buf_size > 0)
134 *q = '\0';
135 *pp = p;
136 }
137
138 static void get_word(char *buf, int buf_size, const char **pp)
139 {
140 const char *p;
141 char *q;
142
143 p = *pp;
144 skip_spaces(&p);
145 q = buf;
146 while (!redir_isspace(*p) && *p != '\0') {
147 if ((q - buf) < buf_size - 1)
148 *q++ = *p;
149 p++;
150 }
151 if (buf_size > 0)
152 *q = '\0';
153 *pp = p;
154 }
155
156 /* parse the rtpmap description: <codec_name>/<clock_rate>[/<other
157 params>] */
158 static int sdp_parse_rtpmap(AVCodecContext *codec, RTSPStream *rtsp_st, int payload_type, const char *p)
159 {
160 char buf[256];
161 int i;
162 AVCodec *c;
163 const char *c_name;
164
165 /* Loop into AVRtpDynamicPayloadTypes[] and AVRtpPayloadTypes[] and
166 see if we can handle this kind of payload */
167 get_word_sep(buf, sizeof(buf), "/", &p);
168 if (payload_type >= RTP_PT_PRIVATE) {
169 RTPDynamicProtocolHandler *handler= RTPFirstDynamicPayloadHandler;
170 while(handler) {
171 if (!strcmp(buf, handler->enc_name) && (codec->codec_type == handler->codec_type)) {
172 codec->codec_id = handler->codec_id;
173 rtsp_st->dynamic_handler= handler;
174 if(handler->open) {
175 rtsp_st->dynamic_protocol_context= handler->open();
176 }
177 break;
178 }
179 handler= handler->next;
180 }
181 } else {
182 /* We are in a standard case ( from http://www.iana.org/assignments/rtp-parameters) */
183 /* search into AVRtpPayloadTypes[] */
184 codec->codec_id = ff_rtp_codec_id(buf, codec->codec_type);
185 }
186
187 c = avcodec_find_decoder(codec->codec_id);
188 if (c && c->name)
189 c_name = c->name;
190 else
191 c_name = (char *)NULL;
192
193 if (c_name) {
194 get_word_sep(buf, sizeof(buf), "/", &p);
195 i = atoi(buf);
196 switch (codec->codec_type) {
197 case CODEC_TYPE_AUDIO:
198 av_log(codec, AV_LOG_DEBUG, " audio codec set to : %s\n", c_name);
199 codec->sample_rate = RTSP_DEFAULT_AUDIO_SAMPLERATE;
200 codec->channels = RTSP_DEFAULT_NB_AUDIO_CHANNELS;
201 if (i > 0) {
202 codec->sample_rate = i;
203 get_word_sep(buf, sizeof(buf), "/", &p);
204 i = atoi(buf);
205 if (i > 0)
206 codec->channels = i;
207 // TODO: there is a bug here; if it is a mono stream, and less than 22000Hz, faad upconverts to stereo and twice the
208 // frequency. No problem, but the sample rate is being set here by the sdp line. Upcoming patch forthcoming. (rdm)
209 }
210 av_log(codec, AV_LOG_DEBUG, " audio samplerate set to : %i\n", codec->sample_rate);
211 av_log(codec, AV_LOG_DEBUG, " audio channels set to : %i\n", codec->channels);
212 break;
213 case CODEC_TYPE_VIDEO:
214 av_log(codec, AV_LOG_DEBUG, " video codec set to : %s\n", c_name);
215 break;
216 default:
217 break;
218 }
219 return 0;
220 }
221
222 return -1;
223 }
224
225 /* return the length and optionnaly the data */
226 static int hex_to_data(uint8_t *data, const char *p)
227 {
228 int c, len, v;
229
230 len = 0;
231 v = 1;
232 for(;;) {
233 skip_spaces(&p);
234 if (p == '\0')
235 break;
236 c = toupper((unsigned char)*p++);
237 if (c >= '0' && c <= '9')
238 c = c - '0';
239 else if (c >= 'A' && c <= 'F')
240 c = c - 'A' + 10;
241 else
242 break;
243 v = (v << 4) | c;
244 if (v & 0x100) {
245 if (data)
246 data[len] = v;
247 len++;
248 v = 1;
249 }
250 }
251 return len;
252 }
253
254 static void sdp_parse_fmtp_config(AVCodecContext *codec, char *attr, char *value)
255 {
256 switch (codec->codec_id) {
257 case CODEC_ID_MPEG4:
258 case CODEC_ID_AAC:
259 if (!strcmp(attr, "config")) {
260 /* decode the hexa encoded parameter */
261 int len = hex_to_data(NULL, value);
262 codec->extradata = av_mallocz(len + FF_INPUT_BUFFER_PADDING_SIZE);
263 if (!codec->extradata)
264 return;
265 codec->extradata_size = len;
266 hex_to_data(codec->extradata, value);
267 }
268 break;
269 default:
270 break;
271 }
272 return;
273 }
274
275 typedef struct attrname_map
276 {
277 const char *str;
278 uint16_t type;
279 uint32_t offset;
280 } attrname_map_t;
281
282 /* All known fmtp parmeters and the corresping RTPAttrTypeEnum */
283 #define ATTR_NAME_TYPE_INT 0
284 #define ATTR_NAME_TYPE_STR 1
285 static attrname_map_t attr_names[]=
286 {
287 {"SizeLength", ATTR_NAME_TYPE_INT, offsetof(rtp_payload_data_t, sizelength)},
288 {"IndexLength", ATTR_NAME_TYPE_INT, offsetof(rtp_payload_data_t, indexlength)},
289 {"IndexDeltaLength", ATTR_NAME_TYPE_INT, offsetof(rtp_payload_data_t, indexdeltalength)},
290 {"profile-level-id", ATTR_NAME_TYPE_INT, offsetof(rtp_payload_data_t, profile_level_id)},
291 {"StreamType", ATTR_NAME_TYPE_INT, offsetof(rtp_payload_data_t, streamtype)},
292 {"mode", ATTR_NAME_TYPE_STR, offsetof(rtp_payload_data_t, mode)},
293 {NULL, -1, -1},
294 };
295
296 /** parse the attribute line from the fmtp a line of an sdp resonse. This is broken out as a function
297 * because it is used in rtp_h264.c, which is forthcoming.
298 */
299 int rtsp_next_attr_and_value(const char **p, char *attr, int attr_size, char *value, int value_size)
300 {
301 skip_spaces(p);
302 if(**p)
303 {
304 get_word_sep(attr, attr_size, "=", p);
305 if (**p == '=')
306 (*p)++;
307 get_word_sep(value, value_size, ";", p);
308 if (**p == ';')
309 (*p)++;
310 return 1;
311 }
312 return 0;
313 }
314
315 /* parse a SDP line and save stream attributes */
316 static void sdp_parse_fmtp(AVStream *st, const char *p)
317 {
318 char attr[256];
319 char value[4096];
320 int i;
321
322 RTSPStream *rtsp_st = st->priv_data;
323 AVCodecContext *codec = st->codec;
324 rtp_payload_data_t *rtp_payload_data = &rtsp_st->rtp_payload_data;
325
326 /* loop on each attribute */
327 while(rtsp_next_attr_and_value(&p, attr, sizeof(attr), value, sizeof(value)))
328 {
329 /* grab the codec extra_data from the config parameter of the fmtp line */
330 sdp_parse_fmtp_config(codec, attr, value);
331 /* Looking for a known attribute */
332 for (i = 0; attr_names[i].str; ++i) {
333 if (!strcasecmp(attr, attr_names[i].str)) {
334 if (attr_names[i].type == ATTR_NAME_TYPE_INT)
335 *(int *)((char *)rtp_payload_data + attr_names[i].offset) = atoi(value);
336 else if (attr_names[i].type == ATTR_NAME_TYPE_STR)
337 *(char **)((char *)rtp_payload_data + attr_names[i].offset) = av_strdup(value);
338 }
339 }
340 }
341 }
342
343 /** Parse a string \p in the form of Range:npt=xx-xx, and determine the start
344 * and end time.
345 * Used for seeking in the rtp stream.
346 */
347 static void rtsp_parse_range_npt(const char *p, int64_t *start, int64_t *end)
348 {
349 char buf[256];
350
351 skip_spaces(&p);
352 if (!av_stristart(p, "npt=", &p))
353 return;
354
355 *start = AV_NOPTS_VALUE;
356 *end = AV_NOPTS_VALUE;
357
358 get_word_sep(buf, sizeof(buf), "-", &p);
359 *start = parse_date(buf, 1);
360 if (*p == '-') {
361 p++;
362 get_word_sep(buf, sizeof(buf), "-", &p);
363 *end = parse_date(buf, 1);
364 }
365 // av_log(NULL, AV_LOG_DEBUG, "Range Start: %lld\n", *start);
366 // av_log(NULL, AV_LOG_DEBUG, "Range End: %lld\n", *end);
367 }
368
369 typedef struct SDPParseState {
370 /* SDP only */
371 struct in_addr default_ip;
372 int default_ttl;
373 } SDPParseState;
374
375 static void sdp_parse_line(AVFormatContext *s, SDPParseState *s1,
376 int letter, const char *buf)
377 {
378 RTSPState *rt = s->priv_data;
379 char buf1[64], st_type[64];
380 const char *p;
381 int codec_type, payload_type, i;
382 AVStream *st;
383 RTSPStream *rtsp_st;
384 struct in_addr sdp_ip;
385 int ttl;
386
387 #ifdef DEBUG
388 printf("sdp: %c='%s'\n", letter, buf);
389 #endif
390
391 p = buf;
392 switch(letter) {
393 case 'c':
394 get_word(buf1, sizeof(buf1), &p);
395 if (strcmp(buf1, "IN") != 0)
396 return;
397 get_word(buf1, sizeof(buf1), &p);
398 if (strcmp(buf1, "IP4") != 0)
399 return;
400 get_word_sep(buf1, sizeof(buf1), "/", &p);
401 if (inet_aton(buf1, &sdp_ip) == 0)
402 return;
403 ttl = 16;
404 if (*p == '/') {
405 p++;
406 get_word_sep(buf1, sizeof(buf1), "/", &p);
407 ttl = atoi(buf1);
408 }
409 if (s->nb_streams == 0) {
410 s1->default_ip = sdp_ip;
411 s1->default_ttl = ttl;
412 } else {
413 st = s->streams[s->nb_streams - 1];
414 rtsp_st = st->priv_data;
415 rtsp_st->sdp_ip = sdp_ip;
416 rtsp_st->sdp_ttl = ttl;
417 }
418 break;
419 case 's':
420 av_strlcpy(s->title, p, sizeof(s->title));
421 break;
422 case 'i':
423 if (s->nb_streams == 0) {
424 av_strlcpy(s->comment, p, sizeof(s->comment));
425 break;
426 }
427 break;
428 case 'm':
429 /* new stream */
430 get_word(st_type, sizeof(st_type), &p);
431 if (!strcmp(st_type, "audio")) {
432 codec_type = CODEC_TYPE_AUDIO;
433 } else if (!strcmp(st_type, "video")) {
434 codec_type = CODEC_TYPE_VIDEO;
435 } else {
436 return;
437 }
438 rtsp_st = av_mallocz(sizeof(RTSPStream));
439 if (!rtsp_st)
440 return;
441 rtsp_st->stream_index = -1;
442 dynarray_add(&rt->rtsp_streams, &rt->nb_rtsp_streams, rtsp_st);
443
444 rtsp_st->sdp_ip = s1->default_ip;
445 rtsp_st->sdp_ttl = s1->default_ttl;
446
447 get_word(buf1, sizeof(buf1), &p); /* port */
448 rtsp_st->sdp_port = atoi(buf1);
449
450 get_word(buf1, sizeof(buf1), &p); /* protocol (ignored) */
451
452 /* XXX: handle list of formats */
453 get_word(buf1, sizeof(buf1), &p); /* format list */
454 rtsp_st->sdp_payload_type = atoi(buf1);
455
456 if (!strcmp(ff_rtp_enc_name(rtsp_st->sdp_payload_type), "MP2T")) {
457 /* no corresponding stream */
458 } else {
459 st = av_new_stream(s, 0);
460 if (!st)
461 return;
462 st->priv_data = rtsp_st;
463 rtsp_st->stream_index = st->index;
464 st->codec->codec_type = codec_type;
465 if (rtsp_st->sdp_payload_type < RTP_PT_PRIVATE) {
466 /* if standard payload type, we can find the codec right now */
467 rtp_get_codec_info(st->codec, rtsp_st->sdp_payload_type);
468 }
469 }
470 /* put a default control url */
471 av_strlcpy(rtsp_st->control_url, s->filename, sizeof(rtsp_st->control_url));
472 break;
473 case 'a':
474 if (av_strstart(p, "control:", &p) && s->nb_streams > 0) {
475 char proto[32];
476 /* get the control url */
477 st = s->streams[s->nb_streams - 1];
478 rtsp_st = st->priv_data;
479
480 /* XXX: may need to add full url resolution */
481 url_split(proto, sizeof(proto), NULL, 0, NULL, 0, NULL, NULL, 0, p);
482 if (proto[0] == '\0') {
483 /* relative control URL */
484 av_strlcat(rtsp_st->control_url, "/", sizeof(rtsp_st->control_url));
485 av_strlcat(rtsp_st->control_url, p, sizeof(rtsp_st->control_url));
486 } else {
487 av_strlcpy(rtsp_st->control_url, p, sizeof(rtsp_st->control_url));
488 }
489 } else if (av_strstart(p, "rtpmap:", &p)) {
490 /* NOTE: rtpmap is only supported AFTER the 'm=' tag */
491 get_word(buf1, sizeof(buf1), &p);
492 payload_type = atoi(buf1);
493 for(i = 0; i < s->nb_streams;i++) {
494 st = s->streams[i];
495 rtsp_st = st->priv_data;
496 if (rtsp_st->sdp_payload_type == payload_type) {
497 sdp_parse_rtpmap(st->codec, rtsp_st, payload_type, p);
498 }
499 }
500 } else if (av_strstart(p, "fmtp:", &p)) {
501 /* NOTE: fmtp is only supported AFTER the 'a=rtpmap:xxx' tag */
502 get_word(buf1, sizeof(buf1), &p);
503 payload_type = atoi(buf1);
504 for(i = 0; i < s->nb_streams;i++) {
505 st = s->streams[i];
506 rtsp_st = st->priv_data;
507 if (rtsp_st->sdp_payload_type == payload_type) {
508 if(rtsp_st->dynamic_handler && rtsp_st->dynamic_handler->parse_sdp_a_line) {
509 if(!rtsp_st->dynamic_handler->parse_sdp_a_line(st, rtsp_st->dynamic_protocol_context, buf)) {
510 sdp_parse_fmtp(st, p);
511 }
512 } else {
513 sdp_parse_fmtp(st, p);
514 }
515 }
516 }
517 } else if(av_strstart(p, "framesize:", &p)) {
518 // let dynamic protocol handlers have a stab at the line.
519 get_word(buf1, sizeof(buf1), &p);
520 payload_type = atoi(buf1);
521 for(i = 0; i < s->nb_streams;i++) {
522 st = s->streams[i];
523 rtsp_st = st->priv_data;
524 if (rtsp_st->sdp_payload_type == payload_type) {
525 if(rtsp_st->dynamic_handler && rtsp_st->dynamic_handler->parse_sdp_a_line) {
526 rtsp_st->dynamic_handler->parse_sdp_a_line(st, rtsp_st->dynamic_protocol_context, buf);
527 }
528 }
529 }
530 } else if(av_strstart(p, "range:", &p)) {
531 int64_t start, end;
532
533 // this is so that seeking on a streamed file can work.
534 rtsp_parse_range_npt(p, &start, &end);
535 s->start_time= start;
536 s->duration= (end==AV_NOPTS_VALUE)?AV_NOPTS_VALUE:end-start; // AV_NOPTS_VALUE means live broadcast (and can't seek)
537 } else if (s->nb_streams > 0) {
538 rtsp_st = s->streams[s->nb_streams - 1]->priv_data;
539 if (rtsp_st->dynamic_handler &&
540 rtsp_st->dynamic_handler->parse_sdp_a_line)
541 rtsp_st->dynamic_handler->parse_sdp_a_line(s->streams[s->nb_streams - 1],
542 rtsp_st->dynamic_protocol_context, buf);
543 }
544 break;
545 }
546 }
547
548 static int sdp_parse(AVFormatContext *s, const char *content)
549 {
550 const char *p;
551 int letter;
552 char buf[2048], *q;
553 SDPParseState sdp_parse_state, *s1 = &sdp_parse_state;
554
555 memset(s1, 0, sizeof(SDPParseState));
556 p = content;
557 for(;;) {
558 skip_spaces(&p);
559 letter = *p;
560 if (letter == '\0')
561 break;
562 p++;
563 if (*p != '=')
564 goto next_line;
565 p++;
566 /* get the content */
567 q = buf;
568 while (*p != '\n' && *p != '\r' && *p != '\0') {
569 if ((q - buf) < sizeof(buf) - 1)
570 *q++ = *p;
571 p++;
572 }
573 *q = '\0';
574 sdp_parse_line(s, s1, letter, buf);
575 next_line:
576 while (*p != '\n' && *p != '\0')
577 p++;
578 if (*p == '\n')
579 p++;
580 }
581 return 0;
582 }
583
584 static void rtsp_parse_range(int *min_ptr, int *max_ptr, const char **pp)
585 {
586 const char *p;
587 int v;
588
589 p = *pp;
590 skip_spaces(&p);
591 v = strtol(p, (char **)&p, 10);
592 if (*p == '-') {
593 p++;
594 *min_ptr = v;
595 v = strtol(p, (char **)&p, 10);
596 *max_ptr = v;
597 } else {
598 *min_ptr = v;
599 *max_ptr = v;
600 }
601 *pp = p;
602 }
603
604 /* XXX: only one transport specification is parsed */
605 static void rtsp_parse_transport(RTSPHeader *reply, const char *p)
606 {
607 char transport_protocol[16];
608 char profile[16];
609 char lower_transport[16];
610 char parameter[16];
611 RTSPTransportField *th;
612 char buf[256];
613
614 reply->nb_transports = 0;
615
616 for(;;) {
617 skip_spaces(&p);
618 if (*p == '\0')
619 break;
620
621 th = &reply->transports[reply->nb_transports];
622
623 get_word_sep(transport_protocol, sizeof(transport_protocol),
624 "/", &p);
625 if (*p == '/')
626 p++;
627 if (!strcasecmp (transport_protocol, "rtp")) {
628 get_word_sep(profile, sizeof(profile), "/;,", &p);
629 lower_transport[0] = '\0';
630 /* rtp/avp/<protocol> */
631 if (*p == '/') {
632 p++;
633 get_word_sep(lower_transport, sizeof(lower_transport),
634 ";,", &p);
635 }
636 } else if (!strcasecmp (transport_protocol, "x-pn-tng")) {
637 /* x-pn-tng/<protocol> */
638 get_word_sep(lower_transport, sizeof(lower_transport), "/;,", &p);
639 profile[0] = '\0';
640 }
641 if (!strcasecmp(lower_transport, "TCP"))
642 th->protocol = RTSP_PROTOCOL_RTP_TCP;
643 else
644 th->protocol = RTSP_PROTOCOL_RTP_UDP;
645
646 if (*p == ';')
647 p++;
648 /* get each parameter */
649 while (*p != '\0' && *p != ',') {
650 get_word_sep(parameter, sizeof(parameter), "=;,", &p);
651 if (!strcmp(parameter, "port")) {
652 if (*p == '=') {
653 p++;
654 rtsp_parse_range(&th->port_min, &th->port_max, &p);
655 }
656 } else if (!strcmp(parameter, "client_port")) {
657 if (*p == '=') {
658 p++;
659 rtsp_parse_range(&th->client_port_min,
660 &th->client_port_max, &p);
661 }
662 } else if (!strcmp(parameter, "server_port")) {
663 if (*p == '=') {
664 p++;
665 rtsp_parse_range(&th->server_port_min,
666 &th->server_port_max, &p);
667 }
668 } else if (!strcmp(parameter, "interleaved")) {
669 if (*p == '=') {
670 p++;
671 rtsp_parse_range(&th->interleaved_min,
672 &th->interleaved_max, &p);
673 }
674 } else if (!strcmp(parameter, "multicast")) {
675 if (th->protocol == RTSP_PROTOCOL_RTP_UDP)
676 th->protocol = RTSP_PROTOCOL_RTP_UDP_MULTICAST;
677 } else if (!strcmp(parameter, "ttl")) {
678 if (*p == '=') {
679 p++;
680 th->ttl = strtol(p, (char **)&p, 10);
681 }
682 } else if (!strcmp(parameter, "destination")) {
683 struct in_addr ipaddr;
684
685 if (*p == '=') {
686 p++;
687 get_word_sep(buf, sizeof(buf), ";,", &p);
688 if (inet_aton(buf, &ipaddr))
689 th->destination = ntohl(ipaddr.s_addr);
690 }
691 }
692 while (*p != ';' && *p != '\0' && *p != ',')
693 p++;
694 if (*p == ';')
695 p++;
696 }
697 if (*p == ',')
698 p++;
699
700 reply->nb_transports++;
701 }
702 }
703
704 void rtsp_parse_line(RTSPHeader *reply, const char *buf)
705 {
706 const char *p;
707
708 /* NOTE: we do case independent match for broken servers */
709 p = buf;
710 if (av_stristart(p, "Session:", &p)) {
711 get_word_sep(reply->session_id, sizeof(reply->session_id), ";", &p);
712 } else if (av_stristart(p, "Content-Length:", &p)) {
713 reply->content_length = strtol(p, NULL, 10);
714 } else if (av_stristart(p, "Transport:", &p)) {
715 rtsp_parse_transport(reply, p);
716 } else if (av_stristart(p, "CSeq:", &p)) {
717 reply->seq = strtol(p, NULL, 10);
718 } else if (av_stristart(p, "Range:", &p)) {
719 rtsp_parse_range_npt(p, &reply->range_start, &reply->range_end);
720 } else if (av_stristart(p, "RealChallenge1:", &p)) {
721 skip_spaces(&p);
722 av_strlcpy(reply->real_challenge, p, sizeof(reply->real_challenge));
723 }
724 }
725
726 static int url_readbuf(URLContext *h, unsigned char *buf, int size)
727 {
728 int ret, len;
729
730 len = 0;
731 while (len < size) {
732 ret = url_read(h, buf+len, size-len);
733 if (ret < 1)
734 return ret;
735 len += ret;
736 }
737 return len;
738 }
739
740 /* skip a RTP/TCP interleaved packet */
741 static void rtsp_skip_packet(AVFormatContext *s)
742 {
743 RTSPState *rt = s->priv_data;
744 int ret, len, len1;
745 uint8_t buf[1024];
746
747 ret = url_readbuf(rt->rtsp_hd, buf, 3);
748 if (ret != 3)
749 return;
750 len = AV_RB16(buf + 1);
751 #ifdef DEBUG
752 printf("skipping RTP packet len=%d\n", len);
753 #endif
754 /* skip payload */
755 while (len > 0) {
756 len1 = len;
757 if (len1 > sizeof(buf))
758 len1 = sizeof(buf);
759 ret = url_readbuf(rt->rtsp_hd, buf, len1);
760 if (ret != len1)
761 return;
762 len -= len1;
763 }
764 }
765
766 static void rtsp_send_cmd(AVFormatContext *s,
767 const char *cmd, RTSPHeader *reply,
768 unsigned char **content_ptr)
769 {
770 RTSPState *rt = s->priv_data;
771 char buf[4096], buf1[1024], *q;
772 unsigned char ch;
773 const char *p;
774 int content_length, line_count;
775 unsigned char *content = NULL;
776
777 memset(reply, 0, sizeof(RTSPHeader));
778
779 rt->seq++;
780 av_strlcpy(buf, cmd, sizeof(buf));
781 snprintf(buf1, sizeof(buf1), "CSeq: %d\r\n", rt->seq);
782 av_strlcat(buf, buf1, sizeof(buf));
783 if (rt->session_id[0] != '\0' && !strstr(cmd, "\nIf-Match:")) {
784 snprintf(buf1, sizeof(buf1), "Session: %s\r\n", rt->session_id);
785 av_strlcat(buf, buf1, sizeof(buf));
786 }
787 av_strlcat(buf, "\r\n", sizeof(buf));
788 #ifdef DEBUG
789 printf("Sending:\n%s--\n", buf);
790 #endif
791 url_write(rt->rtsp_hd, buf, strlen(buf));
792
793 /* parse reply (XXX: use buffers) */
794 line_count = 0;
795 rt->last_reply[0] = '\0';
796 for(;;) {
797 q = buf;
798 for(;;) {
799 if (url_readbuf(rt->rtsp_hd, &ch, 1) != 1)
800 break;
801 if (ch == '\n')
802 break;
803 if (ch == '$') {
804 /* XXX: only parse it if first char on line ? */
805 rtsp_skip_packet(s);
806 } else if (ch != '\r') {
807 if ((q - buf) < sizeof(buf) - 1)
808 *q++ = ch;
809 }
810 }
811 *q = '\0';
812 #ifdef DEBUG
813 printf("line='%s'\n", buf);
814 #endif
815 /* test if last line */
816 if (buf[0] == '\0')
817 break;
818 p = buf;
819 if (line_count == 0) {
820 /* get reply code */
821 get_word(buf1, sizeof(buf1), &p);
822 get_word(buf1, sizeof(buf1), &p);
823 reply->status_code = atoi(buf1);
824 } else {
825 rtsp_parse_line(reply, p);
826 av_strlcat(rt->last_reply, p, sizeof(rt->last_reply));
827 av_strlcat(rt->last_reply, "\n", sizeof(rt->last_reply));
828 }
829 line_count++;
830 }
831
832 if (rt->session_id[0] == '\0' && reply->session_id[0] != '\0')
833 av_strlcpy(rt->session_id, reply->session_id, sizeof(rt->session_id));
834
835 content_length = reply->content_length;
836 if (content_length > 0) {
837 /* leave some room for a trailing '\0' (useful for simple parsing) */
838 content = av_malloc(content_length + 1);
839 (void)url_readbuf(rt->rtsp_hd, content, content_length);
840 content[content_length] = '\0';
841 }
842 if (content_ptr)
843 *content_ptr = content;
844 else
845 av_free(content);
846 }
847
848
849 /* close and free RTSP streams */
850 static void rtsp_close_streams(RTSPState *rt)
851 {
852 int i;
853 RTSPStream *rtsp_st;
854
855 for(i=0;i<rt->nb_rtsp_streams;i++) {
856 rtsp_st = rt->rtsp_streams[i];
857 if (rtsp_st) {
858 if (rtsp_st->rtp_ctx)
859 rtp_parse_close(rtsp_st->rtp_ctx);
860 if (rtsp_st->rtp_handle)
861 url_close(rtsp_st->rtp_handle);
862 if (rtsp_st->dynamic_handler && rtsp_st->dynamic_protocol_context)
863 rtsp_st->dynamic_handler->close(rtsp_st->dynamic_protocol_context);
864 }
865 }
866 av_free(rt->rtsp_streams);
867 }
868
869 /**
870 * @returns 0 on success, <0 on error, 1 if protocol is unavailable.
871 */
872 static int
873 make_setup_request (AVFormatContext *s, const char *host, int port, int protocol)
874 {
875 RTSPState *rt = s->priv_data;
876 int j, i, err;
877 RTSPStream *rtsp_st;
878 AVStream *st;
879 RTSPHeader reply1, *reply = &reply1;
880 char cmd[2048];
881
882 /* for each stream, make the setup request */
883 /* XXX: we assume the same server is used for the control of each
884 RTSP stream */
885
886 for(j = RTSP_RTP_PORT_MIN, i = 0; i < rt->nb_rtsp_streams; ++i) {
887 char transport[2048];
888
889 rtsp_st = rt->rtsp_streams[i];
890
891 /* compute available transports */
892 transport[0] = '\0';
893
894 /* RTP/UDP */
895 if (protocol == RTSP_PROTOCOL_RTP_UDP) {
896 char buf[256];
897
898 /* first try in specified port range */
899 if (RTSP_RTP_PORT_MIN != 0) {
900 while(j <= RTSP_RTP_PORT_MAX) {
901 snprintf(buf, sizeof(buf), "rtp://%s?localport=%d", host, j);
902 j += 2; /* we will use two port by rtp stream (rtp and rtcp) */
903 if (url_open(&rtsp_st->rtp_handle, buf, URL_RDWR) == 0) {
904 goto rtp_opened;
905 }
906 }
907 }
908
909 /* then try on any port
910 ** if (url_open(&rtsp_st->rtp_handle, "rtp://", URL_RDONLY) < 0) {
911 ** err = AVERROR_INVALIDDATA;
912 ** goto fail;
913 ** }
914 */
915
916 rtp_opened:
917 port = rtp_get_local_port(rtsp_st->rtp_handle);
918 if (transport[0] != '\0')
919 av_strlcat(transport, ",", sizeof(transport));
920 snprintf(transport + strlen(transport), sizeof(transport) - strlen(transport) - 1,
921 "RTP/AVP/UDP;unicast;client_port=%d-%d",
922 port, port + 1);
923 }
924
925 /* RTP/TCP */
926 else if (protocol == RTSP_PROTOCOL_RTP_TCP) {
927 if (transport[0] != '\0')
928 av_strlcat(transport, ",", sizeof(transport));
929 snprintf(transport + strlen(transport), sizeof(transport) - strlen(transport) - 1,
930 "RTP/AVP/TCP");
931 }
932
933 else if (protocol == RTSP_PROTOCOL_RTP_UDP_MULTICAST) {
934 if (transport[0] != '\0')
935 av_strlcat(transport, ",", sizeof(transport));
936 snprintf(transport + strlen(transport),
937 sizeof(transport) - strlen(transport) - 1,
938 "RTP/AVP/UDP;multicast");
939 }
940 snprintf(cmd, sizeof(cmd),
941 "SETUP %s RTSP/1.0\r\n"
942 "Transport: %s\r\n",
943 rtsp_st->control_url, transport);
944 rtsp_send_cmd(s, cmd, reply, NULL);
945 if (reply->status_code == 461 /* Unsupported protocol */ && i == 0) {
946 err = 1;
947 goto fail;
948 } else if (reply->status_code != RTSP_STATUS_OK ||
949 reply->nb_transports != 1) {
950 err = AVERROR_INVALIDDATA;
951 goto fail;
952 }
953
954 /* XXX: same protocol for all streams is required */
955 if (i > 0) {
956 if (reply->transports[0].protocol != rt->protocol) {
957 err = AVERROR_INVALIDDATA;
958 goto fail;
959 }
960 } else {
961 rt->protocol = reply->transports[0].protocol;
962 }
963
964 /* close RTP connection if not choosen */
965 if (reply->transports[0].protocol != RTSP_PROTOCOL_RTP_UDP &&
966 (protocol == RTSP_PROTOCOL_RTP_UDP)) {
967 url_close(rtsp_st->rtp_handle);
968 rtsp_st->rtp_handle = NULL;
969 }
970
971 switch(reply->transports[0].protocol) {
972 case RTSP_PROTOCOL_RTP_TCP:
973 rtsp_st->interleaved_min = reply->transports[0].interleaved_min;
974 rtsp_st->interleaved_max = reply->transports[0].interleaved_max;
975 break;
976
977 case RTSP_PROTOCOL_RTP_UDP:
978 {
979 char url[1024];
980
981 /* XXX: also use address if specified */
982 snprintf(url, sizeof(url), "rtp://%s:%d",
983 host, reply->transports[0].server_port_min);
984 if (rtp_set_remote_url(rtsp_st->rtp_handle, url) < 0) {
985 err = AVERROR_INVALIDDATA;
986 goto fail;
987 }
988 }
989 break;
990 case RTSP_PROTOCOL_RTP_UDP_MULTICAST:
991 {
992 char url[1024];
993 struct in_addr in;
994
995 in.s_addr = htonl(reply->transports[0].destination);
996 snprintf(url, sizeof(url), "rtp://%s:%d?ttl=%d",
997 inet_ntoa(in),
998 reply->transports[0].port_min,
999 reply->transports[0].ttl);
1000 if (url_open(&rtsp_st->rtp_handle, url, URL_RDWR) < 0) {
1001 err = AVERROR_INVALIDDATA;
1002 goto fail;
1003 }
1004 }
1005 break;
1006 }
1007 /* open the RTP context */
1008 st = NULL;
1009 if (rtsp_st->stream_index >= 0)
1010 st = s->streams[rtsp_st->stream_index];
1011 if (!st)
1012 s->ctx_flags |= AVFMTCTX_NOHEADER;
1013 rtsp_st->rtp_ctx = rtp_parse_open(s, st, rtsp_st->rtp_handle, rtsp_st->sdp_payload_type, &rtsp_st->rtp_payload_data);
1014
1015 if (!rtsp_st->rtp_ctx) {
1016 err = AVERROR(ENOMEM);
1017 goto fail;
1018 } else {
1019 if(rtsp_st->dynamic_handler) {
1020 rtsp_st->rtp_ctx->dynamic_protocol_context= rtsp_st->dynamic_protocol_context;
1021 rtsp_st->rtp_ctx->parse_packet= rtsp_st->dynamic_handler->parse_packet;
1022 }
1023 }
1024 }
1025
1026 return 0;
1027
1028 fail:
1029 for (i=0; i<rt->nb_rtsp_streams; i++) {
1030 if (rt->rtsp_streams[i]->rtp_handle) {
1031 url_close(rt->rtsp_streams[i]->rtp_handle);
1032 rt->rtsp_streams[i]->rtp_handle = NULL;
1033 }
1034 }
1035 return err;
1036 }
1037
1038 static int rtsp_read_header(AVFormatContext *s,
1039 AVFormatParameters *ap)
1040 {
1041 RTSPState *rt = s->priv_data;
1042 char host[1024], path[1024], tcpname[1024], cmd[2048], *option_list, *option;
1043 URLContext *rtsp_hd;
1044 int port, ret, err;
1045 RTSPHeader reply1, *reply = &reply1;
1046 unsigned char *content = NULL;
1047 int protocol_mask = 0;
1048 char real_challenge[64];
1049
1050 /* extract hostname and port */
1051 url_split(NULL, 0, NULL, 0,
1052 host, sizeof(host), &port, path, sizeof(path), s->filename);
1053 if (port < 0)
1054 port = RTSP_DEFAULT_PORT;
1055
1056 /* search for options */
1057 option_list = strchr(path, '?');
1058 if (option_list) {
1059 /* remove the options from the path */
1060 *option_list++ = 0;
1061 while(option_list) {
1062 /* move the option pointer */
1063 option = option_list;
1064 option_list = strchr(option_list, '&');
1065 if (option_list)
1066 *(option_list++) = 0;
1067 /* handle the options */
1068 if (strcmp(option, "udp") == 0)
1069 protocol_mask = (1<< RTSP_PROTOCOL_RTP_UDP);
1070 else if (strcmp(option, "multicast") == 0)
1071 protocol_mask = (1<< RTSP_PROTOCOL_RTP_UDP_MULTICAST);
1072 else if (strcmp(option, "tcp") == 0)
1073 protocol_mask = (1<< RTSP_PROTOCOL_RTP_TCP);
1074 }
1075 }
1076
1077 if (!protocol_mask)
1078 protocol_mask = (1 << RTSP_PROTOCOL_RTP_LAST) - 1;
1079
1080 /* open the tcp connexion */
1081 snprintf(tcpname, sizeof(tcpname), "tcp://%s:%d", host, port);
1082 if (url_open(&rtsp_hd, tcpname, URL_RDWR) < 0)
1083 return AVERROR(EIO);
1084 rt->rtsp_hd = rtsp_hd;
1085 rt->seq = 0;
1086
1087 /* request options supported by the server; this also detects server type */
1088 for (rt->server_type = RTSP_SERVER_RTP;;) {
1089 snprintf(cmd, sizeof(cmd),
1090 "OPTIONS %s RTSP/1.0\r\n", s->filename);
1091 if (rt->server_type == RTSP_SERVER_RDT)
1092 av_strlcat(cmd,
1093 /**
1094 * The following entries are required for proper
1095 * streaming from a Realmedia server. They are
1096 * interdependent in some way although we currently
1097 * don't quite understand how. Values were copied
1098 * from mplayer SVN r23589.
1099 * @param CompanyID is a 16-byte ID in base64
1100 * @param ClientChallenge is a 16-byte ID in hex
1101 */
1102 "ClientChallenge: 9e26d33f2984236010ef6253fb1887f7\r\n"
1103 "PlayerStarttime: [28/03/2003:22:50:23 00:00]\r\n"
1104 "CompanyID: KnKV4M4I/B2FjJ1TToLycw==\r\n"
1105 "GUID: 00000000-0000-0000-0000-000000000000\r\n",
1106 sizeof(cmd));
1107 rtsp_send_cmd(s, cmd, reply, NULL);
1108 if (reply->status_code != RTSP_STATUS_OK) {
1109 err = AVERROR_INVALIDDATA;
1110 goto fail;
1111 }
1112
1113 /* detect server type if not standard-compliant RTP */
1114 if (rt->server_type != RTSP_SERVER_RDT && reply->real_challenge[0]) {
1115 rt->server_type = RTSP_SERVER_RDT;
1116 continue;
1117 } else if (rt->server_type == RTSP_SERVER_RDT) {
1118 strcpy(real_challenge, reply->real_challenge);
1119 }
1120 break;
1121 }
1122
1123 /* describe the stream */
1124 snprintf(cmd, sizeof(cmd),
1125 "DESCRIBE %s RTSP/1.0\r\n"
1126 "Accept: application/sdp\r\n",
1127 s->filename);
1128 if (rt->server_type == RTSP_SERVER_RDT) {
1129 /**
1130 * The Require: attribute is needed for proper streaming from
1131 * Realmedia servers.
1132 */
1133 av_strlcat(cmd,
1134 "Require: com.real.retain-entity-for-setup\r\n",
1135 sizeof(cmd));
1136 }
1137 rtsp_send_cmd(s, cmd, reply, &content);
1138 if (!content) {
1139 err = AVERROR_INVALIDDATA;
1140 goto fail;
1141 }
1142 if (reply->status_code != RTSP_STATUS_OK) {
1143 err = AVERROR_INVALIDDATA;
1144 goto fail;
1145 }
1146
1147 /* now we got the SDP description, we parse it */
1148 ret = sdp_parse(s, (const char *)content);
1149 av_freep(&content);
1150 if (ret < 0) {
1151 err = AVERROR_INVALIDDATA;
1152 goto fail;
1153 }
1154
1155 do {
1156 int protocol = ff_log2_tab[protocol_mask & ~(protocol_mask - 1)];
1157
1158 err = make_setup_request(s, host, port, protocol);
1159 if (err < 0)
1160 goto fail;
1161 protocol_mask &= ~(1 << protocol);
1162 if (protocol_mask == 0 && err == 1) {
1163 err = AVERROR(FF_NETERROR(EPROTONOSUPPORT));
1164 goto fail;
1165 }
1166 } while (err);
1167
1168 rt->state = RTSP_STATE_IDLE;
1169 rt->seek_timestamp = 0; /* default is to start stream at position
1170 zero */
1171 if (ap->initial_pause) {
1172 /* do not start immediately */
1173 } else {
1174 if (rtsp_read_play(s) < 0) {
1175 err = AVERROR_INVALIDDATA;
1176 goto fail;
1177 }
1178 }
1179 return 0;
1180 fail:
1181 rtsp_close_streams(rt);
1182 av_freep(&content);
1183 url_close(rt->rtsp_hd);
1184 return err;
1185 }
1186
1187 static int tcp_read_packet(AVFormatContext *s, RTSPStream **prtsp_st,
1188 uint8_t *buf, int buf_size)
1189 {
1190 RTSPState *rt = s->priv_data;
1191 int id, len, i, ret;
1192 RTSPStream *rtsp_st;
1193
1194 #ifdef DEBUG_RTP_TCP
1195 printf("tcp_read_packet:\n");
1196 #endif
1197 redo:
1198 for(;;) {
1199 ret = url_readbuf(rt->rtsp_hd, buf, 1);
1200 #ifdef DEBUG_RTP_TCP
1201 printf("ret=%d c=%02x [%c]\n", ret, buf[0], buf[0]);
1202 #endif
1203 if (ret != 1)
1204 return -1;
1205 if (buf[0] == '$')
1206 break;
1207 }
1208 ret = url_readbuf(rt->rtsp_hd, buf, 3);
1209 if (ret != 3)
1210 return -1;
1211 id = buf[0];
1212 len = AV_RB16(buf + 1);
1213 #ifdef DEBUG_RTP_TCP
1214 printf("id=%d len=%d\n", id, len);
1215 #endif
1216 if (len > buf_size || len < 12)
1217 goto redo;
1218 /* get the data */
1219 ret = url_readbuf(rt->rtsp_hd, buf, len);
1220 if (ret != len)
1221 return -1;
1222
1223 /* find the matching stream */
1224 for(i = 0; i < rt->nb_rtsp_streams; i++) {
1225 rtsp_st = rt->rtsp_streams[i];
1226 if (id >= rtsp_st->interleaved_min &&
1227 id <= rtsp_st->interleaved_max)
1228 goto found;
1229 }
1230 goto redo;
1231 found:
1232 *prtsp_st = rtsp_st;
1233 return len;
1234 }
1235
1236 static int udp_read_packet(AVFormatContext *s, RTSPStream **prtsp_st,
1237 uint8_t *buf, int buf_size)
1238 {
1239 RTSPState *rt = s->priv_data;
1240 RTSPStream *rtsp_st;
1241 fd_set rfds;
1242 int fd1, fd2, fd_max, n, i, ret;
1243 struct timeval tv;
1244
1245 for(;;) {
1246 if (url_interrupt_cb())
1247 return AVERROR(EINTR);
1248 FD_ZERO(&rfds);
1249 fd_max = -1;
1250 for(i = 0; i < rt->nb_rtsp_streams; i++) {
1251 rtsp_st = rt->rtsp_streams[i];
1252 /* currently, we cannot probe RTCP handle because of blocking restrictions */
1253 rtp_get_file_handles(rtsp_st->rtp_handle, &fd1, &fd2);
1254 if (fd1 > fd_max)
1255 fd_max = fd1;
1256 FD_SET(fd1, &rfds);
1257 }
1258 tv.tv_sec = 0;
1259 tv.tv_usec = 100 * 1000;
1260 n = select(fd_max + 1, &rfds, NULL, NULL, &tv);
1261 if (n > 0) {
1262 for(i = 0; i < rt->nb_rtsp_streams; i++) {
1263 rtsp_st = rt->rtsp_streams[i];
1264 rtp_get_file_handles(rtsp_st->rtp_handle, &fd1, &fd2);
1265 if (FD_ISSET(fd1, &rfds)) {
1266 ret = url_read(rtsp_st->rtp_handle, buf, buf_size);
1267 if (ret > 0) {
1268 *prtsp_st = rtsp_st;
1269 return ret;
1270 }
1271 }
1272 }
1273 }
1274 }
1275 }
1276
1277 static int rtsp_read_packet(AVFormatContext *s,
1278 AVPacket *pkt)
1279 {
1280 RTSPState *rt = s->priv_data;
1281 RTSPStream *rtsp_st;
1282 int ret, len;
1283 uint8_t buf[RTP_MAX_PACKET_LENGTH];
1284
1285 /* get next frames from the same RTP packet */
1286 if (rt->cur_rtp) {
1287 ret = rtp_parse_packet(rt->cur_rtp, pkt, NULL, 0);
1288 if (ret == 0) {
1289 rt->cur_rtp = NULL;
1290 return 0;
1291 } else if (ret == 1) {
1292 return 0;
1293 } else {
1294 rt->cur_rtp = NULL;
1295 }
1296 }
1297
1298 /* read next RTP packet */
1299 redo:
1300 switch(rt->protocol) {
1301 default:
1302 case RTSP_PROTOCOL_RTP_TCP:
1303 len = tcp_read_packet(s, &rtsp_st, buf, sizeof(buf));
1304 break;
1305 case RTSP_PROTOCOL_RTP_UDP:
1306 case RTSP_PROTOCOL_RTP_UDP_MULTICAST:
1307 len = udp_read_packet(s, &rtsp_st, buf, sizeof(buf));
1308 if (len >=0 && rtsp_st->rtp_ctx)
1309 rtp_check_and_send_back_rr(rtsp_st->rtp_ctx, len);
1310 break;
1311 }
1312 if (len < 0)
1313 return len;
1314 ret = rtp_parse_packet(rtsp_st->rtp_ctx, pkt, buf, len);
1315 if (ret < 0)
1316 goto redo;
1317 if (ret == 1) {
1318 /* more packets may follow, so we save the RTP context */
1319 rt->cur_rtp = rtsp_st->rtp_ctx;
1320 }
1321 return 0;
1322 }
1323
1324 static int rtsp_read_play(AVFormatContext *s)
1325 {
1326 RTSPState *rt = s->priv_data;
1327 RTSPHeader reply1, *reply = &reply1;
1328 char cmd[1024];
1329
1330 av_log(s, AV_LOG_DEBUG, "hello state=%d\n", rt->state);
1331
1332 if (rt->state == RTSP_STATE_PAUSED) {
1333 snprintf(cmd, sizeof(cmd),
1334 "PLAY %s RTSP/1.0\r\n",
1335 s->filename);
1336 } else {
1337 snprintf(cmd, sizeof(cmd),
1338 "PLAY %s RTSP/1.0\r\n"
1339 "Range: npt=%0.3f-\r\n",
1340 s->filename,
1341 (double)rt->seek_timestamp / AV_TIME_BASE);
1342 }
1343 rtsp_send_cmd(s, cmd, reply, NULL);
1344 if (reply->status_code != RTSP_STATUS_OK) {
1345 return -1;
1346 }
1347 rt->state = RTSP_STATE_PLAYING;
1348 return 0;
1349 }
1350
1351 /* pause the stream */
1352 static int rtsp_read_pause(AVFormatContext *s)
1353 {
1354 RTSPState *rt = s->priv_data;
1355 RTSPHeader reply1, *reply = &reply1;
1356 char cmd[1024];
1357
1358 rt = s->priv_data;
1359
1360 if (rt->state != RTSP_STATE_PLAYING)
1361 return 0;
1362
1363 snprintf(cmd, sizeof(cmd),
1364 "PAUSE %s RTSP/1.0\r\n",
1365 s->filename);
1366 rtsp_send_cmd(s, cmd, reply, NULL);
1367 if (reply->status_code != RTSP_STATUS_OK) {
1368 return -1;
1369 }
1370 rt->state = RTSP_STATE_PAUSED;
1371 return 0;
1372 }
1373
1374 static int rtsp_read_seek(AVFormatContext *s, int stream_index,
1375 int64_t timestamp, int flags)
1376 {
1377 RTSPState *rt = s->priv_data;
1378
1379 rt->seek_timestamp = av_rescale_q(timestamp, s->streams[stream_index]->time_base, AV_TIME_BASE_Q);
1380 switch(rt->state) {
1381 default:
1382 case RTSP_STATE_IDLE:
1383 break;
1384 case RTSP_STATE_PLAYING:
1385 if (rtsp_read_play(s) != 0)
1386 return -1;
1387 break;
1388 case RTSP_STATE_PAUSED:
1389 rt->state = RTSP_STATE_IDLE;
1390 break;
1391 }
1392 return 0;
1393 }
1394
1395 static int rtsp_read_close(AVFormatContext *s)
1396 {
1397 RTSPState *rt = s->priv_data;
1398 RTSPHeader reply1, *reply = &reply1;
1399 char cmd[1024];
1400
1401 #if 0
1402 /* NOTE: it is valid to flush the buffer here */
1403 if (rt->protocol == RTSP_PROTOCOL_RTP_TCP) {
1404 url_fclose(&rt->rtsp_gb);
1405 }
1406 #endif
1407 snprintf(cmd, sizeof(cmd),
1408 "TEARDOWN %s RTSP/1.0\r\n",
1409 s->filename);
1410 rtsp_send_cmd(s, cmd, reply, NULL);
1411
1412 rtsp_close_streams(rt);
1413 url_close(rt->rtsp_hd);
1414 return 0;
1415 }
1416
1417 #ifdef CONFIG_RTSP_DEMUXER
1418 AVInputFormat rtsp_demuxer = {
1419 "rtsp",
1420 NULL_IF_CONFIG_SMALL("RTSP input format"),
1421 sizeof(RTSPState),
1422 rtsp_probe,
1423 rtsp_read_header,
1424 rtsp_read_packet,
1425 rtsp_read_close,
1426 rtsp_read_seek,
1427 .flags = AVFMT_NOFILE,
1428 .read_play = rtsp_read_play,
1429 .read_pause = rtsp_read_pause,
1430 };
1431 #endif
1432
1433 static int sdp_probe(AVProbeData *p1)
1434 {
1435 const char *p = p1->buf, *p_end = p1->buf + p1->buf_size;
1436
1437 /* we look for a line beginning "c=IN IP4" */
1438 while (p < p_end && *p != '\0') {
1439 if (p + sizeof("c=IN IP4") - 1 < p_end && av_strstart(p, "c=IN IP4", NULL))
1440 return AVPROBE_SCORE_MAX / 2;
1441
1442 while(p < p_end - 1 && *p != '\n') p++;
1443 if (++p >= p_end)
1444 break;
1445 if (*p == '\r')
1446 p++;
1447 }
1448 return 0;
1449 }
1450
1451 #define SDP_MAX_SIZE 8192
1452
1453 static int sdp_read_header(AVFormatContext *s,
1454 AVFormatParameters *ap)
1455 {
1456 RTSPState *rt = s->priv_data;
1457 RTSPStream *rtsp_st;
1458 int size, i, err;
1459 char *content;
1460 char url[1024];
1461 AVStream *st;
1462
1463 /* read the whole sdp file */
1464 /* XXX: better loading */
1465 content = av_malloc(SDP_MAX_SIZE);
1466 size = get_buffer(s->pb, content, SDP_MAX_SIZE - 1);
1467 if (size <= 0) {
1468 av_free(content);
1469 return AVERROR_INVALIDDATA;
1470 }
1471 content[size] ='\0';
1472
1473 sdp_parse(s, content);
1474 av_free(content);
1475
1476 /* open each RTP stream */
1477 for(i=0;i<rt->nb_rtsp_streams;i++) {
1478 rtsp_st = rt->rtsp_streams[i];
1479
1480 snprintf(url, sizeof(url), "rtp://%s:%d?localport=%d&ttl=%d",
1481 inet_ntoa(rtsp_st->sdp_ip),
1482 rtsp_st->sdp_port,
1483 rtsp_st->sdp_port,
1484 rtsp_st->sdp_ttl);
1485 if (url_open(&rtsp_st->rtp_handle, url, URL_RDWR) < 0) {
1486 err = AVERROR_INVALIDDATA;
1487 goto fail;
1488 }
1489 /* open the RTP context */
1490 st = NULL;
1491 if (rtsp_st->stream_index >= 0)
1492 st = s->streams[rtsp_st->stream_index];
1493 if (!st)
1494 s->ctx_flags |= AVFMTCTX_NOHEADER;
1495 rtsp_st->rtp_ctx = rtp_parse_open(s, st, rtsp_st->rtp_handle, rtsp_st->sdp_payload_type, &rtsp_st->rtp_payload_data);
1496 if (!rtsp_st->rtp_ctx) {
1497 err = AVERROR(ENOMEM);
1498 goto fail;
1499 } else {
1500 if(rtsp_st->dynamic_handler) {
1501 rtsp_st->rtp_ctx->dynamic_protocol_context= rtsp_st->dynamic_protocol_context;
1502 rtsp_st->rtp_ctx->parse_packet= rtsp_st->dynamic_handler->parse_packet;
1503 }
1504 }
1505 }
1506 return 0;
1507 fail:
1508 rtsp_close_streams(rt);
1509 return err;
1510 }
1511
1512 static int sdp_read_packet(AVFormatContext *s,
1513 AVPacket *pkt)
1514 {
1515 return rtsp_read_packet(s, pkt);
1516 }
1517
1518 static int sdp_read_close(AVFormatContext *s)
1519 {
1520 RTSPState *rt = s->priv_data;
1521 rtsp_close_streams(rt);
1522 return 0;
1523 }
1524
1525 #ifdef CONFIG_SDP_DEMUXER
1526 AVInputFormat sdp_demuxer = {
1527 "sdp",
1528 NULL_IF_CONFIG_SMALL("SDP"),
1529 sizeof(RTSPState),
1530 sdp_probe,
1531 sdp_read_header,
1532 sdp_read_packet,
1533 sdp_read_close,
1534 };
1535 #endif
1536
1537 #ifdef CONFIG_REDIR_DEMUXER
1538 /* dummy redirector format (used directly in av_open_input_file now) */
1539 static int redir_probe(AVProbeData *pd)
1540 {
1541 const char *p;
1542 p = pd->buf;
1543 while (redir_isspace(*p))
1544 p++;
1545 if (av_strstart(p, "http://", NULL) ||
1546 av_strstart(p, "rtsp://", NULL))
1547 return AVPROBE_SCORE_MAX;
1548 return 0;
1549 }
1550
1551 static int redir_read_header(AVFormatContext *s, AVFormatParameters *ap)
1552 {
1553 char buf[4096], *q;
1554 int c;
1555 AVFormatContext *ic = NULL;
1556 ByteIOContext *f = s->pb;
1557
1558 /* parse each URL and try to open it */
1559 c = url_fgetc(f);
1560 while (c != URL_EOF) {
1561 /* skip spaces */
1562 for(;;) {
1563 if (!redir_isspace(c))
1564 break;
1565 c = url_fgetc(f);
1566 }
1567 if (c == URL_EOF)
1568 break;
1569 /* record url */
1570 q = buf;
1571 for(;;) {
1572 if (c == URL_EOF || redir_isspace(c))
1573 break;
1574 if ((q - buf) < sizeof(buf) - 1)
1575 *q++ = c;
1576 c = url_fgetc(f);
1577 }
1578 *q = '\0';
1579 //printf("URL='%s'\n", buf);
1580 /* try to open the media file */
1581 if (av_open_input_file(&ic, buf, NULL, 0, NULL) == 0)
1582 break;
1583 }
1584 if (!ic)
1585 return AVERROR(EIO);
1586
1587 *s = *ic;
1588 url_fclose(f);
1589
1590 return 0;
1591 }
1592
1593 AVInputFormat redir_demuxer = {
1594 "redir",
1595 NULL_IF_CONFIG_SMALL("Redirector format"),
1596 0,
1597 redir_probe,
1598 redir_read_header,
1599 NULL,
1600 NULL,
1601 };
1602 #endif