e2ba76e6362d4cca41ba0c080cc86dacb59be4ee
[ffmpeg.git] / libavformat / rtspdec.c
1 /*
2  * RTSP demuxer
3  * Copyright (c) 2002 Fabrice Bellard
4  *
5  * This file is part of Libav.
6  *
7  * Libav 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  * Libav 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 Libav; 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/avstring.h"
23 #include "libavutil/intreadwrite.h"
24 #include "avformat.h"
25
26 #include "internal.h"
27 #include "network.h"
28 #include "os_support.h"
29 #include "rtsp.h"
30 #include "rdt.h"
31
32 //#define DEBUG
33 //#define DEBUG_RTP_TCP
34
35 static int rtsp_read_play(AVFormatContext *s)
36 {
37     RTSPState *rt = s->priv_data;
38     RTSPMessageHeader reply1, *reply = &reply1;
39     int i;
40     char cmd[1024];
41
42     av_log(s, AV_LOG_DEBUG, "hello state=%d\n", rt->state);
43     rt->nb_byes = 0;
44
45     if (!(rt->server_type == RTSP_SERVER_REAL && rt->need_subscription)) {
46         if (rt->transport == RTSP_TRANSPORT_RTP) {
47             for (i = 0; i < rt->nb_rtsp_streams; i++) {
48                 RTSPStream *rtsp_st = rt->rtsp_streams[i];
49                 RTPDemuxContext *rtpctx = rtsp_st->transport_priv;
50                 if (!rtpctx)
51                     continue;
52                 ff_rtp_reset_packet_queue(rtpctx);
53                 rtpctx->last_rtcp_ntp_time  = AV_NOPTS_VALUE;
54                 rtpctx->first_rtcp_ntp_time = AV_NOPTS_VALUE;
55                 rtpctx->base_timestamp      = 0;
56                 rtpctx->rtcp_ts_offset      = 0;
57             }
58         }
59         if (rt->state == RTSP_STATE_PAUSED) {
60             cmd[0] = 0;
61         } else {
62             snprintf(cmd, sizeof(cmd),
63                      "Range: npt=%"PRId64".%03"PRId64"-\r\n",
64                      rt->seek_timestamp / AV_TIME_BASE,
65                      rt->seek_timestamp / (AV_TIME_BASE / 1000) % 1000);
66         }
67         ff_rtsp_send_cmd(s, "PLAY", rt->control_uri, cmd, reply, NULL);
68         if (reply->status_code != RTSP_STATUS_OK) {
69             return -1;
70         }
71         if (rt->transport == RTSP_TRANSPORT_RTP &&
72             reply->range_start != AV_NOPTS_VALUE) {
73             for (i = 0; i < rt->nb_rtsp_streams; i++) {
74                 RTSPStream *rtsp_st = rt->rtsp_streams[i];
75                 RTPDemuxContext *rtpctx = rtsp_st->transport_priv;
76                 AVStream *st = NULL;
77                 if (!rtpctx || rtsp_st->stream_index < 0)
78                     continue;
79                 st = s->streams[rtsp_st->stream_index];
80                 rtpctx->range_start_offset =
81                     av_rescale_q(reply->range_start, AV_TIME_BASE_Q,
82                                  st->time_base);
83             }
84         }
85     }
86     rt->state = RTSP_STATE_STREAMING;
87     return 0;
88 }
89
90 /* pause the stream */
91 static int rtsp_read_pause(AVFormatContext *s)
92 {
93     RTSPState *rt = s->priv_data;
94     RTSPMessageHeader reply1, *reply = &reply1;
95
96     if (rt->state != RTSP_STATE_STREAMING)
97         return 0;
98     else if (!(rt->server_type == RTSP_SERVER_REAL && rt->need_subscription)) {
99         ff_rtsp_send_cmd(s, "PAUSE", rt->control_uri, NULL, reply, NULL);
100         if (reply->status_code != RTSP_STATUS_OK) {
101             return -1;
102         }
103     }
104     rt->state = RTSP_STATE_PAUSED;
105     return 0;
106 }
107
108 int ff_rtsp_setup_input_streams(AVFormatContext *s, RTSPMessageHeader *reply)
109 {
110     RTSPState *rt = s->priv_data;
111     char cmd[1024];
112     unsigned char *content = NULL;
113     int ret;
114
115     /* describe the stream */
116     snprintf(cmd, sizeof(cmd),
117              "Accept: application/sdp\r\n");
118     if (rt->server_type == RTSP_SERVER_REAL) {
119         /**
120          * The Require: attribute is needed for proper streaming from
121          * Realmedia servers.
122          */
123         av_strlcat(cmd,
124                    "Require: com.real.retain-entity-for-setup\r\n",
125                    sizeof(cmd));
126     }
127     ff_rtsp_send_cmd(s, "DESCRIBE", rt->control_uri, cmd, reply, &content);
128     if (!content)
129         return AVERROR_INVALIDDATA;
130     if (reply->status_code != RTSP_STATUS_OK) {
131         av_freep(&content);
132         return AVERROR_INVALIDDATA;
133     }
134
135     av_log(s, AV_LOG_VERBOSE, "SDP:\n%s\n", content);
136     /* now we got the SDP description, we parse it */
137     ret = ff_sdp_parse(s, (const char *)content);
138     av_freep(&content);
139     if (ret < 0)
140         return ret;
141
142     return 0;
143 }
144
145 static int rtsp_probe(AVProbeData *p)
146 {
147     if (av_strstart(p->filename, "rtsp:", NULL))
148         return AVPROBE_SCORE_MAX;
149     return 0;
150 }
151
152 static int rtsp_read_header(AVFormatContext *s,
153                             AVFormatParameters *ap)
154 {
155     RTSPState *rt = s->priv_data;
156     int ret;
157
158     ret = ff_rtsp_connect(s);
159     if (ret)
160         return ret;
161
162     rt->real_setup_cache = av_mallocz(2 * s->nb_streams * sizeof(*rt->real_setup_cache));
163     if (!rt->real_setup_cache)
164         return AVERROR(ENOMEM);
165     rt->real_setup = rt->real_setup_cache + s->nb_streams;
166
167     if (ap->initial_pause) {
168          /* do not start immediately */
169     } else {
170          if (rtsp_read_play(s) < 0) {
171             ff_rtsp_close_streams(s);
172             ff_rtsp_close_connections(s);
173             return AVERROR_INVALIDDATA;
174         }
175     }
176
177     return 0;
178 }
179
180 int ff_rtsp_tcp_read_packet(AVFormatContext *s, RTSPStream **prtsp_st,
181                             uint8_t *buf, int buf_size)
182 {
183     RTSPState *rt = s->priv_data;
184     int id, len, i, ret;
185     RTSPStream *rtsp_st;
186
187 #ifdef DEBUG_RTP_TCP
188     av_dlog(s, "tcp_read_packet:\n");
189 #endif
190 redo:
191     for (;;) {
192         RTSPMessageHeader reply;
193
194         ret = ff_rtsp_read_reply(s, &reply, NULL, 1, NULL);
195         if (ret < 0)
196             return ret;
197         if (ret == 1) /* received '$' */
198             break;
199         /* XXX: parse message */
200         if (rt->state != RTSP_STATE_STREAMING)
201             return 0;
202     }
203     ret = url_read_complete(rt->rtsp_hd, buf, 3);
204     if (ret != 3)
205         return -1;
206     id  = buf[0];
207     len = AV_RB16(buf + 1);
208 #ifdef DEBUG_RTP_TCP
209     av_dlog(s, "id=%d len=%d\n", id, len);
210 #endif
211     if (len > buf_size || len < 12)
212         goto redo;
213     /* get the data */
214     ret = url_read_complete(rt->rtsp_hd, buf, len);
215     if (ret != len)
216         return -1;
217     if (rt->transport == RTSP_TRANSPORT_RDT &&
218         ff_rdt_parse_header(buf, len, &id, NULL, NULL, NULL, NULL) < 0)
219         return -1;
220
221     /* find the matching stream */
222     for (i = 0; i < rt->nb_rtsp_streams; i++) {
223         rtsp_st = rt->rtsp_streams[i];
224         if (id >= rtsp_st->interleaved_min &&
225             id <= rtsp_st->interleaved_max)
226             goto found;
227     }
228     goto redo;
229 found:
230     *prtsp_st = rtsp_st;
231     return len;
232 }
233
234 static int resetup_tcp(AVFormatContext *s)
235 {
236     RTSPState *rt = s->priv_data;
237     char host[1024];
238     int port;
239
240     av_url_split(NULL, 0, NULL, 0, host, sizeof(host), &port, NULL, 0,
241                  s->filename);
242     ff_rtsp_undo_setup(s);
243     return ff_rtsp_make_setup_request(s, host, port, RTSP_LOWER_TRANSPORT_TCP,
244                                       rt->real_challenge);
245 }
246
247 static int rtsp_read_packet(AVFormatContext *s, AVPacket *pkt)
248 {
249     RTSPState *rt = s->priv_data;
250     int ret;
251     RTSPMessageHeader reply1, *reply = &reply1;
252     char cmd[1024];
253
254 retry:
255     if (rt->server_type == RTSP_SERVER_REAL) {
256         int i;
257
258         for (i = 0; i < s->nb_streams; i++)
259             rt->real_setup[i] = s->streams[i]->discard;
260
261         if (!rt->need_subscription) {
262             if (memcmp (rt->real_setup, rt->real_setup_cache,
263                         sizeof(enum AVDiscard) * s->nb_streams)) {
264                 snprintf(cmd, sizeof(cmd),
265                          "Unsubscribe: %s\r\n",
266                          rt->last_subscription);
267                 ff_rtsp_send_cmd(s, "SET_PARAMETER", rt->control_uri,
268                                  cmd, reply, NULL);
269                 if (reply->status_code != RTSP_STATUS_OK)
270                     return AVERROR_INVALIDDATA;
271                 rt->need_subscription = 1;
272             }
273         }
274
275         if (rt->need_subscription) {
276             int r, rule_nr, first = 1;
277
278             memcpy(rt->real_setup_cache, rt->real_setup,
279                    sizeof(enum AVDiscard) * s->nb_streams);
280             rt->last_subscription[0] = 0;
281
282             snprintf(cmd, sizeof(cmd),
283                      "Subscribe: ");
284             for (i = 0; i < rt->nb_rtsp_streams; i++) {
285                 rule_nr = 0;
286                 for (r = 0; r < s->nb_streams; r++) {
287                     if (s->streams[r]->id == i) {
288                         if (s->streams[r]->discard != AVDISCARD_ALL) {
289                             if (!first)
290                                 av_strlcat(rt->last_subscription, ",",
291                                            sizeof(rt->last_subscription));
292                             ff_rdt_subscribe_rule(
293                                 rt->last_subscription,
294                                 sizeof(rt->last_subscription), i, rule_nr);
295                             first = 0;
296                         }
297                         rule_nr++;
298                     }
299                 }
300             }
301             av_strlcatf(cmd, sizeof(cmd), "%s\r\n", rt->last_subscription);
302             ff_rtsp_send_cmd(s, "SET_PARAMETER", rt->control_uri,
303                              cmd, reply, NULL);
304             if (reply->status_code != RTSP_STATUS_OK)
305                 return AVERROR_INVALIDDATA;
306             rt->need_subscription = 0;
307
308             if (rt->state == RTSP_STATE_STREAMING)
309                 rtsp_read_play (s);
310         }
311     }
312
313     ret = ff_rtsp_fetch_packet(s, pkt);
314     if (ret < 0) {
315         if (ret == AVERROR(ETIMEDOUT) && !rt->packets) {
316             if (rt->lower_transport == RTSP_LOWER_TRANSPORT_UDP &&
317                 rt->lower_transport_mask & (1 << RTSP_LOWER_TRANSPORT_TCP)) {
318                 RTSPMessageHeader reply1, *reply = &reply1;
319                 av_log(s, AV_LOG_WARNING, "UDP timeout, retrying with TCP\n");
320                 if (rtsp_read_pause(s) != 0)
321                     return -1;
322                 // TEARDOWN is required on Real-RTSP, but might make
323                 // other servers close the connection.
324                 if (rt->server_type == RTSP_SERVER_REAL)
325                     ff_rtsp_send_cmd(s, "TEARDOWN", rt->control_uri, NULL,
326                                      reply, NULL);
327                 rt->session_id[0] = '\0';
328                 if (resetup_tcp(s) == 0) {
329                     rt->state = RTSP_STATE_IDLE;
330                     rt->need_subscription = 1;
331                     if (rtsp_read_play(s) != 0)
332                         return -1;
333                     goto retry;
334                 }
335             }
336         }
337         return ret;
338     }
339     rt->packets++;
340
341     /* send dummy request to keep TCP connection alive */
342     if ((av_gettime() - rt->last_cmd_time) / 1000000 >= rt->timeout / 2) {
343         if (rt->server_type != RTSP_SERVER_REAL) {
344             ff_rtsp_send_cmd_async(s, "GET_PARAMETER", rt->control_uri, NULL);
345         } else {
346             ff_rtsp_send_cmd_async(s, "OPTIONS", "*", NULL);
347         }
348     }
349
350     return 0;
351 }
352
353 static int rtsp_read_seek(AVFormatContext *s, int stream_index,
354                           int64_t timestamp, int flags)
355 {
356     RTSPState *rt = s->priv_data;
357
358     rt->seek_timestamp = av_rescale_q(timestamp,
359                                       s->streams[stream_index]->time_base,
360                                       AV_TIME_BASE_Q);
361     switch(rt->state) {
362     default:
363     case RTSP_STATE_IDLE:
364         break;
365     case RTSP_STATE_STREAMING:
366         if (rtsp_read_pause(s) != 0)
367             return -1;
368         rt->state = RTSP_STATE_SEEKING;
369         if (rtsp_read_play(s) != 0)
370             return -1;
371         break;
372     case RTSP_STATE_PAUSED:
373         rt->state = RTSP_STATE_IDLE;
374         break;
375     }
376     return 0;
377 }
378
379 static int rtsp_read_close(AVFormatContext *s)
380 {
381     RTSPState *rt = s->priv_data;
382
383 #if 0
384     /* NOTE: it is valid to flush the buffer here */
385     if (rt->lower_transport == RTSP_LOWER_TRANSPORT_TCP) {
386         avio_close(&rt->rtsp_gb);
387     }
388 #endif
389     ff_rtsp_send_cmd_async(s, "TEARDOWN", rt->control_uri, NULL);
390
391     ff_rtsp_close_streams(s);
392     ff_rtsp_close_connections(s);
393     ff_network_close();
394     rt->real_setup = NULL;
395     av_freep(&rt->real_setup_cache);
396     return 0;
397 }
398
399 AVInputFormat ff_rtsp_demuxer = {
400     "rtsp",
401     NULL_IF_CONFIG_SMALL("RTSP input format"),
402     sizeof(RTSPState),
403     rtsp_probe,
404     rtsp_read_header,
405     rtsp_read_packet,
406     rtsp_read_close,
407     rtsp_read_seek,
408     .flags = AVFMT_NOFILE,
409     .read_play = rtsp_read_play,
410     .read_pause = rtsp_read_pause,
411 };