3 * Copyright (c) 2002 Fabrice Bellard
5 * This file is part of Libav.
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.
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.
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
22 #include "libavutil/avstring.h"
23 #include "libavutil/intreadwrite.h"
24 #include "libavutil/mathematics.h"
29 #include "os_support.h"
34 static int rtsp_read_play(AVFormatContext *s)
36 RTSPState *rt = s->priv_data;
37 RTSPMessageHeader reply1, *reply = &reply1;
41 av_log(s, AV_LOG_DEBUG, "hello state=%d\n", rt->state);
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;
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;
60 if (rt->state == RTSP_STATE_PAUSED) {
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);
68 ff_rtsp_send_cmd(s, "PLAY", rt->control_uri, cmd, reply, NULL);
69 if (reply->status_code != RTSP_STATUS_OK) {
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;
78 if (!rtpctx || rtsp_st->stream_index < 0)
80 st = s->streams[rtsp_st->stream_index];
81 rtpctx->range_start_offset =
82 av_rescale_q(reply->range_start, AV_TIME_BASE_Q,
87 rt->state = RTSP_STATE_STREAMING;
91 /* pause the stream */
92 static int rtsp_read_pause(AVFormatContext *s)
94 RTSPState *rt = s->priv_data;
95 RTSPMessageHeader reply1, *reply = &reply1;
97 if (rt->state != RTSP_STATE_STREAMING)
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) {
105 rt->state = RTSP_STATE_PAUSED;
109 int ff_rtsp_setup_input_streams(AVFormatContext *s, RTSPMessageHeader *reply)
111 RTSPState *rt = s->priv_data;
113 unsigned char *content = NULL;
116 /* describe the stream */
117 snprintf(cmd, sizeof(cmd),
118 "Accept: application/sdp\r\n");
119 if (rt->server_type == RTSP_SERVER_REAL) {
121 * The Require: attribute is needed for proper streaming from
125 "Require: com.real.retain-entity-for-setup\r\n",
128 ff_rtsp_send_cmd(s, "DESCRIBE", rt->control_uri, cmd, reply, &content);
130 return AVERROR_INVALIDDATA;
131 if (reply->status_code != RTSP_STATUS_OK) {
133 return AVERROR_INVALIDDATA;
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);
146 static int rtsp_probe(AVProbeData *p)
148 if (av_strstart(p->filename, "rtsp:", NULL))
149 return AVPROBE_SCORE_MAX;
153 static int rtsp_read_header(AVFormatContext *s)
155 RTSPState *rt = s->priv_data;
158 ret = ff_rtsp_connect(s);
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;
168 if (rt->initial_pause) {
169 /* do not start immediately */
171 if (rtsp_read_play(s) < 0) {
172 ff_rtsp_close_streams(s);
173 ff_rtsp_close_connections(s);
174 return AVERROR_INVALIDDATA;
181 int ff_rtsp_tcp_read_packet(AVFormatContext *s, RTSPStream **prtsp_st,
182 uint8_t *buf, int buf_size)
184 RTSPState *rt = s->priv_data;
188 av_dlog(s, "tcp_read_packet:\n");
191 RTSPMessageHeader reply;
193 ret = ff_rtsp_read_reply(s, &reply, NULL, 1, NULL);
196 if (ret == 1) /* received '$' */
198 /* XXX: parse message */
199 if (rt->state != RTSP_STATE_STREAMING)
202 ret = ffurl_read_complete(rt->rtsp_hd, buf, 3);
206 len = AV_RB16(buf + 1);
207 av_dlog(s, "id=%d len=%d\n", id, len);
208 if (len > buf_size || len < 12)
211 ret = ffurl_read_complete(rt->rtsp_hd, buf, len);
214 if (rt->transport == RTSP_TRANSPORT_RDT &&
215 ff_rdt_parse_header(buf, len, &id, NULL, NULL, NULL, NULL) < 0)
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)
231 static int resetup_tcp(AVFormatContext *s)
233 RTSPState *rt = s->priv_data;
237 av_url_split(NULL, 0, NULL, 0, host, sizeof(host), &port, NULL, 0,
239 ff_rtsp_undo_setup(s);
240 return ff_rtsp_make_setup_request(s, host, port, RTSP_LOWER_TRANSPORT_TCP,
244 static int rtsp_read_packet(AVFormatContext *s, AVPacket *pkt)
246 RTSPState *rt = s->priv_data;
248 RTSPMessageHeader reply1, *reply = &reply1;
252 if (rt->server_type == RTSP_SERVER_REAL) {
255 for (i = 0; i < s->nb_streams; i++)
256 rt->real_setup[i] = s->streams[i]->discard;
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,
266 if (reply->status_code != RTSP_STATUS_OK)
267 return AVERROR_INVALIDDATA;
268 rt->need_subscription = 1;
272 if (rt->need_subscription) {
273 int r, rule_nr, first = 1;
275 memcpy(rt->real_setup_cache, rt->real_setup,
276 sizeof(enum AVDiscard) * s->nb_streams);
277 rt->last_subscription[0] = 0;
279 snprintf(cmd, sizeof(cmd),
281 for (i = 0; i < rt->nb_rtsp_streams; i++) {
283 for (r = 0; r < s->nb_streams; r++) {
284 if (s->streams[r]->id == i) {
285 if (s->streams[r]->discard != AVDISCARD_ALL) {
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);
298 av_strlcatf(cmd, sizeof(cmd), "%s\r\n", rt->last_subscription);
299 ff_rtsp_send_cmd(s, "SET_PARAMETER", rt->control_uri,
301 if (reply->status_code != RTSP_STATUS_OK)
302 return AVERROR_INVALIDDATA;
303 rt->need_subscription = 0;
305 if (rt->state == RTSP_STATE_STREAMING)
310 ret = ff_rtsp_fetch_packet(s, pkt);
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)
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,
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)
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);
346 ff_rtsp_send_cmd_async(s, "OPTIONS", "*", NULL);
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;
357 static int rtsp_read_seek(AVFormatContext *s, int stream_index,
358 int64_t timestamp, int flags)
360 RTSPState *rt = s->priv_data;
362 rt->seek_timestamp = av_rescale_q(timestamp,
363 s->streams[stream_index]->time_base,
367 case RTSP_STATE_IDLE:
369 case RTSP_STATE_STREAMING:
370 if (rtsp_read_pause(s) != 0)
372 rt->state = RTSP_STATE_SEEKING;
373 if (rtsp_read_play(s) != 0)
376 case RTSP_STATE_PAUSED:
377 rt->state = RTSP_STATE_IDLE;
383 static int rtsp_read_close(AVFormatContext *s)
385 RTSPState *rt = s->priv_data;
387 ff_rtsp_send_cmd_async(s, "TEARDOWN", rt->control_uri, NULL);
389 ff_rtsp_close_streams(s);
390 ff_rtsp_close_connections(s);
392 rt->real_setup = NULL;
393 av_freep(&rt->real_setup_cache);
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,
404 AVInputFormat ff_rtsp_demuxer = {
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,