rtsp: make ff_sdp_parse return value forwarded
[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
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=%0.3f-\r\n",
64                      (double)rt->seek_timestamp / AV_TIME_BASE);
65         }
66         ff_rtsp_send_cmd(s, "PLAY", rt->control_uri, cmd, reply, NULL);
67         if (reply->status_code != RTSP_STATUS_OK) {
68             return -1;
69         }
70         if (rt->transport == RTSP_TRANSPORT_RTP &&
71             reply->range_start != AV_NOPTS_VALUE) {
72             for (i = 0; i < rt->nb_rtsp_streams; i++) {
73                 RTSPStream *rtsp_st = rt->rtsp_streams[i];
74                 RTPDemuxContext *rtpctx = rtsp_st->transport_priv;
75                 AVStream *st = NULL;
76                 if (!rtpctx || rtsp_st->stream_index < 0)
77                     continue;
78                 st = s->streams[rtsp_st->stream_index];
79                 rtpctx->range_start_offset =
80                     av_rescale_q(reply->range_start, AV_TIME_BASE_Q,
81                                  st->time_base);
82             }
83         }
84     }
85     rt->state = RTSP_STATE_STREAMING;
86     return 0;
87 }
88
89 /* pause the stream */
90 static int rtsp_read_pause(AVFormatContext *s)
91 {
92     RTSPState *rt = s->priv_data;
93     RTSPMessageHeader reply1, *reply = &reply1;
94
95     if (rt->state != RTSP_STATE_STREAMING)
96         return 0;
97     else if (!(rt->server_type == RTSP_SERVER_REAL && rt->need_subscription)) {
98         ff_rtsp_send_cmd(s, "PAUSE", rt->control_uri, NULL, reply, NULL);
99         if (reply->status_code != RTSP_STATUS_OK) {
100             return -1;
101         }
102     }
103     rt->state = RTSP_STATE_PAUSED;
104     return 0;
105 }
106
107 int ff_rtsp_setup_input_streams(AVFormatContext *s, RTSPMessageHeader *reply)
108 {
109     RTSPState *rt = s->priv_data;
110     char cmd[1024];
111     unsigned char *content = NULL;
112     int ret;
113
114     /* describe the stream */
115     snprintf(cmd, sizeof(cmd),
116              "Accept: application/sdp\r\n");
117     if (rt->server_type == RTSP_SERVER_REAL) {
118         /**
119          * The Require: attribute is needed for proper streaming from
120          * Realmedia servers.
121          */
122         av_strlcat(cmd,
123                    "Require: com.real.retain-entity-for-setup\r\n",
124                    sizeof(cmd));
125     }
126     ff_rtsp_send_cmd(s, "DESCRIBE", rt->control_uri, cmd, reply, &content);
127     if (!content)
128         return AVERROR_INVALIDDATA;
129     if (reply->status_code != RTSP_STATUS_OK) {
130         av_freep(&content);
131         return AVERROR_INVALIDDATA;
132     }
133
134     av_log(s, AV_LOG_VERBOSE, "SDP:\n%s\n", content);
135     /* now we got the SDP description, we parse it */
136     ret = ff_sdp_parse(s, (const char *)content);
137     av_freep(&content);
138     if (ret < 0)
139         return ret;
140
141     return 0;
142 }
143
144 static int rtsp_probe(AVProbeData *p)
145 {
146     if (av_strstart(p->filename, "rtsp:", NULL))
147         return AVPROBE_SCORE_MAX;
148     return 0;
149 }
150
151 static int rtsp_read_header(AVFormatContext *s,
152                             AVFormatParameters *ap)
153 {
154     RTSPState *rt = s->priv_data;
155     int ret;
156
157     ret = ff_rtsp_connect(s);
158     if (ret)
159         return ret;
160
161     rt->real_setup_cache = av_mallocz(2 * s->nb_streams * sizeof(*rt->real_setup_cache));
162     if (!rt->real_setup_cache)
163         return AVERROR(ENOMEM);
164     rt->real_setup = rt->real_setup_cache + s->nb_streams;
165
166     if (ap->initial_pause) {
167          /* do not start immediately */
168     } else {
169          if (rtsp_read_play(s) < 0) {
170             ff_rtsp_close_streams(s);
171             ff_rtsp_close_connections(s);
172             return AVERROR_INVALIDDATA;
173         }
174     }
175
176     return 0;
177 }
178
179 int ff_rtsp_tcp_read_packet(AVFormatContext *s, RTSPStream **prtsp_st,
180                             uint8_t *buf, int buf_size)
181 {
182     RTSPState *rt = s->priv_data;
183     int id, len, i, ret;
184     RTSPStream *rtsp_st;
185
186 #ifdef DEBUG_RTP_TCP
187     dprintf(s, "tcp_read_packet:\n");
188 #endif
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 = url_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 #ifdef DEBUG_RTP_TCP
208     dprintf(s, "id=%d len=%d\n", id, len);
209 #endif
210     if (len > buf_size || len < 12)
211         goto redo;
212     /* get the data */
213     ret = url_read_complete(rt->rtsp_hd, buf, len);
214     if (ret != len)
215         return -1;
216     if (rt->transport == RTSP_TRANSPORT_RDT &&
217         ff_rdt_parse_header(buf, len, &id, NULL, NULL, NULL, NULL) < 0)
218         return -1;
219
220     /* find the matching stream */
221     for (i = 0; i < rt->nb_rtsp_streams; i++) {
222         rtsp_st = rt->rtsp_streams[i];
223         if (id >= rtsp_st->interleaved_min &&
224             id <= rtsp_st->interleaved_max)
225             goto found;
226     }
227     goto redo;
228 found:
229     *prtsp_st = rtsp_st;
230     return len;
231 }
232
233 static int resetup_tcp(AVFormatContext *s)
234 {
235     RTSPState *rt = s->priv_data;
236     char host[1024];
237     int port;
238
239     av_url_split(NULL, 0, NULL, 0, host, sizeof(host), &port, NULL, 0,
240                  s->filename);
241     ff_rtsp_undo_setup(s);
242     return ff_rtsp_make_setup_request(s, host, port, RTSP_LOWER_TRANSPORT_TCP,
243                                       rt->real_challenge);
244 }
245
246 static int rtsp_read_packet(AVFormatContext *s, AVPacket *pkt)
247 {
248     RTSPState *rt = s->priv_data;
249     int ret;
250     RTSPMessageHeader reply1, *reply = &reply1;
251     char cmd[1024];
252
253 retry:
254     if (rt->server_type == RTSP_SERVER_REAL) {
255         int i;
256
257         for (i = 0; i < s->nb_streams; i++)
258             rt->real_setup[i] = s->streams[i]->discard;
259
260         if (!rt->need_subscription) {
261             if (memcmp (rt->real_setup, rt->real_setup_cache,
262                         sizeof(enum AVDiscard) * s->nb_streams)) {
263                 snprintf(cmd, sizeof(cmd),
264                          "Unsubscribe: %s\r\n",
265                          rt->last_subscription);
266                 ff_rtsp_send_cmd(s, "SET_PARAMETER", rt->control_uri,
267                                  cmd, reply, NULL);
268                 if (reply->status_code != RTSP_STATUS_OK)
269                     return AVERROR_INVALIDDATA;
270                 rt->need_subscription = 1;
271             }
272         }
273
274         if (rt->need_subscription) {
275             int r, rule_nr, first = 1;
276
277             memcpy(rt->real_setup_cache, rt->real_setup,
278                    sizeof(enum AVDiscard) * s->nb_streams);
279             rt->last_subscription[0] = 0;
280
281             snprintf(cmd, sizeof(cmd),
282                      "Subscribe: ");
283             for (i = 0; i < rt->nb_rtsp_streams; i++) {
284                 rule_nr = 0;
285                 for (r = 0; r < s->nb_streams; r++) {
286                     if (s->streams[r]->priv_data == rt->rtsp_streams[i]) {
287                         if (s->streams[r]->discard != AVDISCARD_ALL) {
288                             if (!first)
289                                 av_strlcat(rt->last_subscription, ",",
290                                            sizeof(rt->last_subscription));
291                             ff_rdt_subscribe_rule(
292                                 rt->last_subscription,
293                                 sizeof(rt->last_subscription), i, rule_nr);
294                             first = 0;
295                         }
296                         rule_nr++;
297                     }
298                 }
299             }
300             av_strlcatf(cmd, sizeof(cmd), "%s\r\n", rt->last_subscription);
301             ff_rtsp_send_cmd(s, "SET_PARAMETER", rt->control_uri,
302                              cmd, reply, NULL);
303             if (reply->status_code != RTSP_STATUS_OK)
304                 return AVERROR_INVALIDDATA;
305             rt->need_subscription = 0;
306
307             if (rt->state == RTSP_STATE_STREAMING)
308                 rtsp_read_play (s);
309         }
310     }
311
312     ret = ff_rtsp_fetch_packet(s, pkt);
313     if (ret < 0) {
314         if (ret == FF_NETERROR(ETIMEDOUT) && !rt->packets) {
315             if (rt->lower_transport == RTSP_LOWER_TRANSPORT_UDP &&
316                 rt->lower_transport_mask & (1 << RTSP_LOWER_TRANSPORT_TCP)) {
317                 RTSPMessageHeader reply1, *reply = &reply1;
318                 av_log(s, AV_LOG_WARNING, "UDP timeout, retrying with TCP\n");
319                 if (rtsp_read_pause(s) != 0)
320                     return -1;
321                 // TEARDOWN is required on Real-RTSP, but might make
322                 // other servers close the connection.
323                 if (rt->server_type == RTSP_SERVER_REAL)
324                     ff_rtsp_send_cmd(s, "TEARDOWN", rt->control_uri, NULL,
325                                      reply, NULL);
326                 rt->session_id[0] = '\0';
327                 if (resetup_tcp(s) == 0) {
328                     rt->state = RTSP_STATE_IDLE;
329                     rt->need_subscription = 1;
330                     if (rtsp_read_play(s) != 0)
331                         return -1;
332                     goto retry;
333                 }
334             }
335         }
336         return ret;
337     }
338     rt->packets++;
339
340     /* send dummy request to keep TCP connection alive */
341     if ((av_gettime() - rt->last_cmd_time) / 1000000 >= rt->timeout / 2) {
342         if (rt->server_type == RTSP_SERVER_WMS) {
343             ff_rtsp_send_cmd_async(s, "GET_PARAMETER", rt->control_uri, NULL);
344         } else {
345             ff_rtsp_send_cmd_async(s, "OPTIONS", "*", NULL);
346         }
347     }
348
349     return 0;
350 }
351
352 static int rtsp_read_seek(AVFormatContext *s, int stream_index,
353                           int64_t timestamp, int flags)
354 {
355     RTSPState *rt = s->priv_data;
356
357     rt->seek_timestamp = av_rescale_q(timestamp,
358                                       s->streams[stream_index]->time_base,
359                                       AV_TIME_BASE_Q);
360     switch(rt->state) {
361     default:
362     case RTSP_STATE_IDLE:
363         break;
364     case RTSP_STATE_STREAMING:
365         if (rtsp_read_pause(s) != 0)
366             return -1;
367         rt->state = RTSP_STATE_SEEKING;
368         if (rtsp_read_play(s) != 0)
369             return -1;
370         break;
371     case RTSP_STATE_PAUSED:
372         rt->state = RTSP_STATE_IDLE;
373         break;
374     }
375     return 0;
376 }
377
378 static int rtsp_read_close(AVFormatContext *s)
379 {
380     RTSPState *rt = s->priv_data;
381
382 #if 0
383     /* NOTE: it is valid to flush the buffer here */
384     if (rt->lower_transport == RTSP_LOWER_TRANSPORT_TCP) {
385         url_fclose(&rt->rtsp_gb);
386     }
387 #endif
388     ff_rtsp_send_cmd_async(s, "TEARDOWN", rt->control_uri, NULL);
389
390     ff_rtsp_close_streams(s);
391     ff_rtsp_close_connections(s);
392     ff_network_close();
393     rt->real_setup = NULL;
394     av_freep(&rt->real_setup_cache);
395     return 0;
396 }
397
398 AVInputFormat ff_rtsp_demuxer = {
399     "rtsp",
400     NULL_IF_CONFIG_SMALL("RTSP input format"),
401     sizeof(RTSPState),
402     rtsp_probe,
403     rtsp_read_header,
404     rtsp_read_packet,
405     rtsp_read_close,
406     rtsp_read_seek,
407     .flags = AVFMT_NOFILE,
408     .read_play = rtsp_read_play,
409     .read_pause = rtsp_read_pause,
410 };