lavfi/pixdesctest: use AVPALETTE_SIZE macro
[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 "libavutil/mathematics.h"
25 #include "avformat.h"
26
27 #include "internal.h"
28 #include "network.h"
29 #include "os_support.h"
30 #include "rtsp.h"
31 #include "rdt.h"
32 #include "url.h"
33
34 static int rtsp_read_play(AVFormatContext *s)
35 {
36     RTSPState *rt = s->priv_data;
37     RTSPMessageHeader reply1, *reply = &reply1;
38     int i;
39     char cmd[1024];
40
41     av_log(s, AV_LOG_DEBUG, "hello state=%d\n", rt->state);
42     rt->nb_byes = 0;
43
44     if (!(rt->server_type == RTSP_SERVER_REAL && rt->need_subscription)) {
45         if (rt->transport == RTSP_TRANSPORT_RTP) {
46             for (i = 0; i < rt->nb_rtsp_streams; i++) {
47                 RTSPStream *rtsp_st = rt->rtsp_streams[i];
48                 RTPDemuxContext *rtpctx = rtsp_st->transport_priv;
49                 if (!rtpctx)
50                     continue;
51                 ff_rtp_reset_packet_queue(rtpctx);
52                 rtpctx->last_rtcp_ntp_time  = AV_NOPTS_VALUE;
53                 rtpctx->first_rtcp_ntp_time = AV_NOPTS_VALUE;
54                 rtpctx->base_timestamp      = 0;
55                 rtpctx->timestamp           = 0;
56                 rtpctx->unwrapped_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 {
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 = !s->nb_streams ? NULL :
163                            av_mallocz(2 * s->nb_streams * sizeof(*rt->real_setup_cache));
164     if (!rt->real_setup_cache && s->nb_streams)
165         return AVERROR(ENOMEM);
166     rt->real_setup = rt->real_setup_cache + s->nb_streams;
167
168     if (rt->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     av_dlog(s, "tcp_read_packet:\n");
189 redo:
190     for (;;) {
191         RTSPMessageHeader reply;
192
193         ret = ff_rtsp_read_reply(s, &reply, NULL, 1, NULL);
194         if (ret < 0)
195             return ret;
196         if (ret == 1) /* received '$' */
197             break;
198         /* XXX: parse message */
199         if (rt->state != RTSP_STATE_STREAMING)
200             return 0;
201     }
202     ret = ffurl_read_complete(rt->rtsp_hd, buf, 3);
203     if (ret != 3)
204         return -1;
205     id  = buf[0];
206     len = AV_RB16(buf + 1);
207     av_dlog(s, "id=%d len=%d\n", id, len);
208     if (len > buf_size || len < 8)
209         goto redo;
210     /* get the data */
211     ret = ffurl_read_complete(rt->rtsp_hd, buf, len);
212     if (ret != len)
213         return -1;
214     if (rt->transport == RTSP_TRANSPORT_RDT &&
215         ff_rdt_parse_header(buf, len, &id, NULL, NULL, NULL, NULL) < 0)
216         return -1;
217
218     /* find the matching stream */
219     for (i = 0; i < rt->nb_rtsp_streams; i++) {
220         rtsp_st = rt->rtsp_streams[i];
221         if (id >= rtsp_st->interleaved_min &&
222             id <= rtsp_st->interleaved_max)
223             goto found;
224     }
225     goto redo;
226 found:
227     *prtsp_st = rtsp_st;
228     return len;
229 }
230
231 static int resetup_tcp(AVFormatContext *s)
232 {
233     RTSPState *rt = s->priv_data;
234     char host[1024];
235     int port;
236
237     av_url_split(NULL, 0, NULL, 0, host, sizeof(host), &port, NULL, 0,
238                  s->filename);
239     ff_rtsp_undo_setup(s);
240     return ff_rtsp_make_setup_request(s, host, port, RTSP_LOWER_TRANSPORT_TCP,
241                                       rt->real_challenge);
242 }
243
244 static int rtsp_read_packet(AVFormatContext *s, AVPacket *pkt)
245 {
246     RTSPState *rt = s->priv_data;
247     int ret;
248     RTSPMessageHeader reply1, *reply = &reply1;
249     char cmd[1024];
250
251 retry:
252     if (rt->server_type == RTSP_SERVER_REAL) {
253         int i;
254
255         for (i = 0; i < s->nb_streams; i++)
256             rt->real_setup[i] = s->streams[i]->discard;
257
258         if (!rt->need_subscription) {
259             if (memcmp (rt->real_setup, rt->real_setup_cache,
260                         sizeof(enum AVDiscard) * s->nb_streams)) {
261                 snprintf(cmd, sizeof(cmd),
262                          "Unsubscribe: %s\r\n",
263                          rt->last_subscription);
264                 ff_rtsp_send_cmd(s, "SET_PARAMETER", rt->control_uri,
265                                  cmd, reply, NULL);
266                 if (reply->status_code != RTSP_STATUS_OK)
267                     return AVERROR_INVALIDDATA;
268                 rt->need_subscription = 1;
269             }
270         }
271
272         if (rt->need_subscription) {
273             int r, rule_nr, first = 1;
274
275             memcpy(rt->real_setup_cache, rt->real_setup,
276                    sizeof(enum AVDiscard) * s->nb_streams);
277             rt->last_subscription[0] = 0;
278
279             snprintf(cmd, sizeof(cmd),
280                      "Subscribe: ");
281             for (i = 0; i < rt->nb_rtsp_streams; i++) {
282                 rule_nr = 0;
283                 for (r = 0; r < s->nb_streams; r++) {
284                     if (s->streams[r]->id == i) {
285                         if (s->streams[r]->discard != AVDISCARD_ALL) {
286                             if (!first)
287                                 av_strlcat(rt->last_subscription, ",",
288                                            sizeof(rt->last_subscription));
289                             ff_rdt_subscribe_rule(
290                                 rt->last_subscription,
291                                 sizeof(rt->last_subscription), i, rule_nr);
292                             first = 0;
293                         }
294                         rule_nr++;
295                     }
296                 }
297             }
298             av_strlcatf(cmd, sizeof(cmd), "%s\r\n", rt->last_subscription);
299             ff_rtsp_send_cmd(s, "SET_PARAMETER", rt->control_uri,
300                              cmd, reply, NULL);
301             if (reply->status_code != RTSP_STATUS_OK)
302                 return AVERROR_INVALIDDATA;
303             rt->need_subscription = 0;
304
305             if (rt->state == RTSP_STATE_STREAMING)
306                 rtsp_read_play (s);
307         }
308     }
309
310     ret = ff_rtsp_fetch_packet(s, pkt);
311     if (ret < 0) {
312         if (ret == AVERROR(ETIMEDOUT) && !rt->packets) {
313             if (rt->lower_transport == RTSP_LOWER_TRANSPORT_UDP &&
314                 rt->lower_transport_mask & (1 << RTSP_LOWER_TRANSPORT_TCP)) {
315                 RTSPMessageHeader reply1, *reply = &reply1;
316                 av_log(s, AV_LOG_WARNING, "UDP timeout, retrying with TCP\n");
317                 if (rtsp_read_pause(s) != 0)
318                     return -1;
319                 // TEARDOWN is required on Real-RTSP, but might make
320                 // other servers close the connection.
321                 if (rt->server_type == RTSP_SERVER_REAL)
322                     ff_rtsp_send_cmd(s, "TEARDOWN", rt->control_uri, NULL,
323                                      reply, NULL);
324                 rt->session_id[0] = '\0';
325                 if (resetup_tcp(s) == 0) {
326                     rt->state = RTSP_STATE_IDLE;
327                     rt->need_subscription = 1;
328                     if (rtsp_read_play(s) != 0)
329                         return -1;
330                     goto retry;
331                 }
332             }
333         }
334         return ret;
335     }
336     rt->packets++;
337
338     /* send dummy request to keep TCP connection alive */
339     if ((av_gettime() - rt->last_cmd_time) / 1000000 >= rt->timeout / 2 ||
340          rt->auth_state.stale) {
341         if (rt->server_type == RTSP_SERVER_WMS ||
342            (rt->server_type != RTSP_SERVER_REAL &&
343             rt->get_parameter_supported)) {
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         /* The stale flag should be reset when creating the auth response in
349          * ff_rtsp_send_cmd_async, but reset it here just in case we never
350          * called the auth code (if we didn't have any credentials set). */
351         rt->auth_state.stale = 0;
352     }
353
354     return 0;
355 }
356
357 static int rtsp_read_seek(AVFormatContext *s, int stream_index,
358                           int64_t timestamp, int flags)
359 {
360     RTSPState *rt = s->priv_data;
361
362     rt->seek_timestamp = av_rescale_q(timestamp,
363                                       s->streams[stream_index]->time_base,
364                                       AV_TIME_BASE_Q);
365     switch(rt->state) {
366     default:
367     case RTSP_STATE_IDLE:
368         break;
369     case RTSP_STATE_STREAMING:
370         if (rtsp_read_pause(s) != 0)
371             return -1;
372         rt->state = RTSP_STATE_SEEKING;
373         if (rtsp_read_play(s) != 0)
374             return -1;
375         break;
376     case RTSP_STATE_PAUSED:
377         rt->state = RTSP_STATE_IDLE;
378         break;
379     }
380     return 0;
381 }
382
383 static int rtsp_read_close(AVFormatContext *s)
384 {
385     RTSPState *rt = s->priv_data;
386
387     ff_rtsp_send_cmd_async(s, "TEARDOWN", rt->control_uri, NULL);
388
389     ff_rtsp_close_streams(s);
390     ff_rtsp_close_connections(s);
391     ff_network_close();
392     rt->real_setup = NULL;
393     av_freep(&rt->real_setup_cache);
394     return 0;
395 }
396
397 static const AVClass rtsp_demuxer_class = {
398     .class_name     = "RTSP demuxer",
399     .item_name      = av_default_item_name,
400     .option         = ff_rtsp_options,
401     .version        = LIBAVUTIL_VERSION_INT,
402 };
403
404 AVInputFormat ff_rtsp_demuxer = {
405     .name           = "rtsp",
406     .long_name      = NULL_IF_CONFIG_SMALL("RTSP input format"),
407     .priv_data_size = sizeof(RTSPState),
408     .read_probe     = rtsp_probe,
409     .read_header    = rtsp_read_header,
410     .read_packet    = rtsp_read_packet,
411     .read_close     = rtsp_read_close,
412     .read_seek      = rtsp_read_seek,
413     .flags          = AVFMT_NOFILE,
414     .read_play      = rtsp_read_play,
415     .read_pause     = rtsp_read_pause,
416     .priv_class     = &rtsp_demuxer_class,
417 };