Support R10g in mov.
[ffmpeg.git] / libavformat / rtspdec.c
1 /*
2  * RTSP demuxer
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/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 #include "url.h"
32
33 //#define DEBUG
34 //#define DEBUG_RTP_TCP
35
36 static int rtsp_read_play(AVFormatContext *s)
37 {
38     RTSPState *rt = s->priv_data;
39     RTSPMessageHeader reply1, *reply = &reply1;
40     int i;
41     char cmd[1024];
42
43     av_log(s, AV_LOG_DEBUG, "hello state=%d\n", rt->state);
44     rt->nb_byes = 0;
45
46     if (!(rt->server_type == RTSP_SERVER_REAL && rt->need_subscription)) {
47         if (rt->transport == RTSP_TRANSPORT_RTP) {
48             for (i = 0; i < rt->nb_rtsp_streams; i++) {
49                 RTSPStream *rtsp_st = rt->rtsp_streams[i];
50                 RTPDemuxContext *rtpctx = rtsp_st->transport_priv;
51                 if (!rtpctx)
52                     continue;
53                 ff_rtp_reset_packet_queue(rtpctx);
54                 rtpctx->last_rtcp_ntp_time  = AV_NOPTS_VALUE;
55                 rtpctx->first_rtcp_ntp_time = AV_NOPTS_VALUE;
56                 rtpctx->base_timestamp      = 0;
57                 rtpctx->rtcp_ts_offset      = 0;
58             }
59         }
60         if (rt->state == RTSP_STATE_PAUSED) {
61             cmd[0] = 0;
62         } else {
63             snprintf(cmd, sizeof(cmd),
64                      "Range: npt=%"PRId64".%03"PRId64"-\r\n",
65                      rt->seek_timestamp / AV_TIME_BASE,
66                      rt->seek_timestamp / (AV_TIME_BASE / 1000) % 1000);
67         }
68         ff_rtsp_send_cmd(s, "PLAY", rt->control_uri, cmd, reply, NULL);
69         if (reply->status_code != RTSP_STATUS_OK) {
70             return -1;
71         }
72         if (rt->transport == RTSP_TRANSPORT_RTP &&
73             reply->range_start != AV_NOPTS_VALUE) {
74             for (i = 0; i < rt->nb_rtsp_streams; i++) {
75                 RTSPStream *rtsp_st = rt->rtsp_streams[i];
76                 RTPDemuxContext *rtpctx = rtsp_st->transport_priv;
77                 AVStream *st = NULL;
78                 if (!rtpctx || rtsp_st->stream_index < 0)
79                     continue;
80                 st = s->streams[rtsp_st->stream_index];
81                 rtpctx->range_start_offset =
82                     av_rescale_q(reply->range_start, AV_TIME_BASE_Q,
83                                  st->time_base);
84             }
85         }
86     }
87     rt->state = RTSP_STATE_STREAMING;
88     return 0;
89 }
90
91 /* pause the stream */
92 static int rtsp_read_pause(AVFormatContext *s)
93 {
94     RTSPState *rt = s->priv_data;
95     RTSPMessageHeader reply1, *reply = &reply1;
96
97     if (rt->state != RTSP_STATE_STREAMING)
98         return 0;
99     else if (!(rt->server_type == RTSP_SERVER_REAL && rt->need_subscription)) {
100         ff_rtsp_send_cmd(s, "PAUSE", rt->control_uri, NULL, reply, NULL);
101         if (reply->status_code != RTSP_STATUS_OK) {
102             return -1;
103         }
104     }
105     rt->state = RTSP_STATE_PAUSED;
106     return 0;
107 }
108
109 int ff_rtsp_setup_input_streams(AVFormatContext *s, RTSPMessageHeader *reply)
110 {
111     RTSPState *rt = s->priv_data;
112     char cmd[1024];
113     unsigned char *content = NULL;
114     int ret;
115
116     /* describe the stream */
117     snprintf(cmd, sizeof(cmd),
118              "Accept: application/sdp\r\n");
119     if (rt->server_type == RTSP_SERVER_REAL) {
120         /**
121          * The Require: attribute is needed for proper streaming from
122          * Realmedia servers.
123          */
124         av_strlcat(cmd,
125                    "Require: com.real.retain-entity-for-setup\r\n",
126                    sizeof(cmd));
127     }
128     ff_rtsp_send_cmd(s, "DESCRIBE", rt->control_uri, cmd, reply, &content);
129     if (!content)
130         return AVERROR_INVALIDDATA;
131     if (reply->status_code != RTSP_STATUS_OK) {
132         av_freep(&content);
133         return AVERROR_INVALIDDATA;
134     }
135
136     av_log(s, AV_LOG_VERBOSE, "SDP:\n%s\n", content);
137     /* now we got the SDP description, we parse it */
138     ret = ff_sdp_parse(s, (const char *)content);
139     av_freep(&content);
140     if (ret < 0)
141         return ret;
142
143     return 0;
144 }
145
146 static int rtsp_probe(AVProbeData *p)
147 {
148     if (av_strstart(p->filename, "rtsp:", NULL))
149         return AVPROBE_SCORE_MAX;
150     return 0;
151 }
152
153 static int rtsp_read_header(AVFormatContext *s,
154                             AVFormatParameters *ap)
155 {
156     RTSPState *rt = s->priv_data;
157     int ret;
158
159     ret = ff_rtsp_connect(s);
160     if (ret)
161         return ret;
162
163     rt->real_setup_cache = av_mallocz(2 * s->nb_streams * sizeof(*rt->real_setup_cache));
164     if (!rt->real_setup_cache)
165         return AVERROR(ENOMEM);
166     rt->real_setup = rt->real_setup_cache + s->nb_streams;
167
168     if (ap->initial_pause) {
169          /* do not start immediately */
170     } else {
171          if (rtsp_read_play(s) < 0) {
172             ff_rtsp_close_streams(s);
173             ff_rtsp_close_connections(s);
174             return AVERROR_INVALIDDATA;
175         }
176     }
177
178     return 0;
179 }
180
181 int ff_rtsp_tcp_read_packet(AVFormatContext *s, RTSPStream **prtsp_st,
182                             uint8_t *buf, int buf_size)
183 {
184     RTSPState *rt = s->priv_data;
185     int id, len, i, ret;
186     RTSPStream *rtsp_st;
187
188 #ifdef DEBUG_RTP_TCP
189     av_dlog(s, "tcp_read_packet:\n");
190 #endif
191 redo:
192     for (;;) {
193         RTSPMessageHeader reply;
194
195         ret = ff_rtsp_read_reply(s, &reply, NULL, 1, NULL);
196         if (ret < 0)
197             return ret;
198         if (ret == 1) /* received '$' */
199             break;
200         /* XXX: parse message */
201         if (rt->state != RTSP_STATE_STREAMING)
202             return 0;
203     }
204     ret = ffurl_read_complete(rt->rtsp_hd, buf, 3);
205     if (ret != 3)
206         return -1;
207     id  = buf[0];
208     len = AV_RB16(buf + 1);
209 #ifdef DEBUG_RTP_TCP
210     av_dlog(s, "id=%d len=%d\n", id, len);
211 #endif
212     if (len > buf_size || len < 12)
213         goto redo;
214     /* get the data */
215     ret = ffurl_read_complete(rt->rtsp_hd, buf, len);
216     if (ret != len)
217         return -1;
218     if (rt->transport == RTSP_TRANSPORT_RDT &&
219         ff_rdt_parse_header(buf, len, &id, NULL, NULL, NULL, NULL) < 0)
220         return -1;
221
222     /* find the matching stream */
223     for (i = 0; i < rt->nb_rtsp_streams; i++) {
224         rtsp_st = rt->rtsp_streams[i];
225         if (id >= rtsp_st->interleaved_min &&
226             id <= rtsp_st->interleaved_max)
227             goto found;
228     }
229     goto redo;
230 found:
231     *prtsp_st = rtsp_st;
232     return len;
233 }
234
235 static int resetup_tcp(AVFormatContext *s)
236 {
237     RTSPState *rt = s->priv_data;
238     char host[1024];
239     int port;
240
241     av_url_split(NULL, 0, NULL, 0, host, sizeof(host), &port, NULL, 0,
242                  s->filename);
243     ff_rtsp_undo_setup(s);
244     return ff_rtsp_make_setup_request(s, host, port, RTSP_LOWER_TRANSPORT_TCP,
245                                       rt->real_challenge);
246 }
247
248 static int rtsp_read_packet(AVFormatContext *s, AVPacket *pkt)
249 {
250     RTSPState *rt = s->priv_data;
251     int ret;
252     RTSPMessageHeader reply1, *reply = &reply1;
253     char cmd[1024];
254
255 retry:
256     if (rt->server_type == RTSP_SERVER_REAL) {
257         int i;
258
259         for (i = 0; i < s->nb_streams; i++)
260             rt->real_setup[i] = s->streams[i]->discard;
261
262         if (!rt->need_subscription) {
263             if (memcmp (rt->real_setup, rt->real_setup_cache,
264                         sizeof(enum AVDiscard) * s->nb_streams)) {
265                 snprintf(cmd, sizeof(cmd),
266                          "Unsubscribe: %s\r\n",
267                          rt->last_subscription);
268                 ff_rtsp_send_cmd(s, "SET_PARAMETER", rt->control_uri,
269                                  cmd, reply, NULL);
270                 if (reply->status_code != RTSP_STATUS_OK)
271                     return AVERROR_INVALIDDATA;
272                 rt->need_subscription = 1;
273             }
274         }
275
276         if (rt->need_subscription) {
277             int r, rule_nr, first = 1;
278
279             memcpy(rt->real_setup_cache, rt->real_setup,
280                    sizeof(enum AVDiscard) * s->nb_streams);
281             rt->last_subscription[0] = 0;
282
283             snprintf(cmd, sizeof(cmd),
284                      "Subscribe: ");
285             for (i = 0; i < rt->nb_rtsp_streams; i++) {
286                 rule_nr = 0;
287                 for (r = 0; r < s->nb_streams; r++) {
288                     if (s->streams[r]->id == i) {
289                         if (s->streams[r]->discard != AVDISCARD_ALL) {
290                             if (!first)
291                                 av_strlcat(rt->last_subscription, ",",
292                                            sizeof(rt->last_subscription));
293                             ff_rdt_subscribe_rule(
294                                 rt->last_subscription,
295                                 sizeof(rt->last_subscription), i, rule_nr);
296                             first = 0;
297                         }
298                         rule_nr++;
299                     }
300                 }
301             }
302             av_strlcatf(cmd, sizeof(cmd), "%s\r\n", rt->last_subscription);
303             ff_rtsp_send_cmd(s, "SET_PARAMETER", rt->control_uri,
304                              cmd, reply, NULL);
305             if (reply->status_code != RTSP_STATUS_OK)
306                 return AVERROR_INVALIDDATA;
307             rt->need_subscription = 0;
308
309             if (rt->state == RTSP_STATE_STREAMING)
310                 rtsp_read_play (s);
311         }
312     }
313
314     ret = ff_rtsp_fetch_packet(s, pkt);
315     if (ret < 0) {
316         if (ret == AVERROR(ETIMEDOUT) && !rt->packets) {
317             if (rt->lower_transport == RTSP_LOWER_TRANSPORT_UDP &&
318                 rt->lower_transport_mask & (1 << RTSP_LOWER_TRANSPORT_TCP)) {
319                 RTSPMessageHeader reply1, *reply = &reply1;
320                 av_log(s, AV_LOG_WARNING, "UDP timeout, retrying with TCP\n");
321                 if (rtsp_read_pause(s) != 0)
322                     return -1;
323                 // TEARDOWN is required on Real-RTSP, but might make
324                 // other servers close the connection.
325                 if (rt->server_type == RTSP_SERVER_REAL)
326                     ff_rtsp_send_cmd(s, "TEARDOWN", rt->control_uri, NULL,
327                                      reply, NULL);
328                 rt->session_id[0] = '\0';
329                 if (resetup_tcp(s) == 0) {
330                     rt->state = RTSP_STATE_IDLE;
331                     rt->need_subscription = 1;
332                     if (rtsp_read_play(s) != 0)
333                         return -1;
334                     goto retry;
335                 }
336             }
337         }
338         return ret;
339     }
340     rt->packets++;
341
342     /* send dummy request to keep TCP connection alive */
343     if ((av_gettime() - rt->last_cmd_time) / 1000000 >= rt->timeout / 2) {
344         if (rt->server_type == RTSP_SERVER_WMS ||
345            (rt->server_type != RTSP_SERVER_REAL &&
346             rt->get_parameter_supported)) {
347             ff_rtsp_send_cmd_async(s, "GET_PARAMETER", rt->control_uri, NULL);
348         } else {
349             ff_rtsp_send_cmd_async(s, "OPTIONS", "*", NULL);
350         }
351     }
352
353     return 0;
354 }
355
356 static int rtsp_read_seek(AVFormatContext *s, int stream_index,
357                           int64_t timestamp, int flags)
358 {
359     RTSPState *rt = s->priv_data;
360
361     rt->seek_timestamp = av_rescale_q(timestamp,
362                                       s->streams[stream_index]->time_base,
363                                       AV_TIME_BASE_Q);
364     switch(rt->state) {
365     default:
366     case RTSP_STATE_IDLE:
367         break;
368     case RTSP_STATE_STREAMING:
369         if (rtsp_read_pause(s) != 0)
370             return -1;
371         rt->state = RTSP_STATE_SEEKING;
372         if (rtsp_read_play(s) != 0)
373             return -1;
374         break;
375     case RTSP_STATE_PAUSED:
376         rt->state = RTSP_STATE_IDLE;
377         break;
378     }
379     return 0;
380 }
381
382 static int rtsp_read_close(AVFormatContext *s)
383 {
384     RTSPState *rt = s->priv_data;
385
386 #if 0
387     /* NOTE: it is valid to flush the buffer here */
388     if (rt->lower_transport == RTSP_LOWER_TRANSPORT_TCP) {
389         avio_close(&rt->rtsp_gb);
390     }
391 #endif
392     ff_rtsp_send_cmd_async(s, "TEARDOWN", rt->control_uri, NULL);
393
394     ff_rtsp_close_streams(s);
395     ff_rtsp_close_connections(s);
396     ff_network_close();
397     rt->real_setup = NULL;
398     av_freep(&rt->real_setup_cache);
399     return 0;
400 }
401
402 AVInputFormat ff_rtsp_demuxer = {
403     "rtsp",
404     NULL_IF_CONFIG_SMALL("RTSP input format"),
405     sizeof(RTSPState),
406     rtsp_probe,
407     rtsp_read_header,
408     rtsp_read_packet,
409     rtsp_read_close,
410     rtsp_read_seek,
411     .flags = AVFMT_NOFILE,
412     .read_play = rtsp_read_play,
413     .read_pause = rtsp_read_pause,
414 };