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"
25 #include "libavutil/opt.h"
30 #include "os_support.h"
35 static int rtsp_read_play(AVFormatContext *s)
37 RTSPState *rt = s->priv_data;
38 RTSPMessageHeader reply1, *reply = &reply1;
42 av_log(s, AV_LOG_DEBUG, "hello state=%d\n", rt->state);
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;
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;
59 if (rt->state == RTSP_STATE_PAUSED) {
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);
67 ff_rtsp_send_cmd(s, "PLAY", rt->control_uri, cmd, reply, NULL);
68 if (reply->status_code != RTSP_STATUS_OK) {
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;
77 if (!rtpctx || rtsp_st->stream_index < 0)
79 st = s->streams[rtsp_st->stream_index];
80 rtpctx->range_start_offset =
81 av_rescale_q(reply->range_start, AV_TIME_BASE_Q,
86 rt->state = RTSP_STATE_STREAMING;
90 /* pause the stream */
91 static int rtsp_read_pause(AVFormatContext *s)
93 RTSPState *rt = s->priv_data;
94 RTSPMessageHeader reply1, *reply = &reply1;
96 if (rt->state != RTSP_STATE_STREAMING)
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) {
104 rt->state = RTSP_STATE_PAUSED;
108 int ff_rtsp_setup_input_streams(AVFormatContext *s, RTSPMessageHeader *reply)
110 RTSPState *rt = s->priv_data;
112 unsigned char *content = NULL;
115 /* describe the stream */
116 snprintf(cmd, sizeof(cmd),
117 "Accept: application/sdp\r\n");
118 if (rt->server_type == RTSP_SERVER_REAL) {
120 * The Require: attribute is needed for proper streaming from
124 "Require: com.real.retain-entity-for-setup\r\n",
127 ff_rtsp_send_cmd(s, "DESCRIBE", rt->control_uri, cmd, reply, &content);
129 return AVERROR_INVALIDDATA;
130 if (reply->status_code != RTSP_STATUS_OK) {
132 return AVERROR_INVALIDDATA;
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);
145 static int rtsp_probe(AVProbeData *p)
147 if (av_strstart(p->filename, "rtsp:", NULL))
148 return AVPROBE_SCORE_MAX;
152 static int rtsp_read_header(AVFormatContext *s,
153 AVFormatParameters *ap)
155 RTSPState *rt = s->priv_data;
158 ret = ff_rtsp_connect(s);
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;
167 #if FF_API_FORMAT_PARAMETERS
168 if (ap->initial_pause)
169 rt->initial_pause = ap->initial_pause;
172 if (rt->initial_pause) {
173 /* do not start immediately */
175 if (rtsp_read_play(s) < 0) {
176 ff_rtsp_close_streams(s);
177 ff_rtsp_close_connections(s);
178 return AVERROR_INVALIDDATA;
185 int ff_rtsp_tcp_read_packet(AVFormatContext *s, RTSPStream **prtsp_st,
186 uint8_t *buf, int buf_size)
188 RTSPState *rt = s->priv_data;
192 av_dlog(s, "tcp_read_packet:\n");
195 RTSPMessageHeader reply;
197 ret = ff_rtsp_read_reply(s, &reply, NULL, 1, NULL);
200 if (ret == 1) /* received '$' */
202 /* XXX: parse message */
203 if (rt->state != RTSP_STATE_STREAMING)
206 ret = ffurl_read_complete(rt->rtsp_hd, buf, 3);
210 len = AV_RB16(buf + 1);
211 av_dlog(s, "id=%d len=%d\n", id, len);
212 if (len > buf_size || len < 12)
215 ret = ffurl_read_complete(rt->rtsp_hd, buf, len);
218 if (rt->transport == RTSP_TRANSPORT_RDT &&
219 ff_rdt_parse_header(buf, len, &id, NULL, NULL, NULL, NULL) < 0)
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)
235 static int resetup_tcp(AVFormatContext *s)
237 RTSPState *rt = s->priv_data;
241 av_url_split(NULL, 0, NULL, 0, host, sizeof(host), &port, NULL, 0,
243 ff_rtsp_undo_setup(s);
244 return ff_rtsp_make_setup_request(s, host, port, RTSP_LOWER_TRANSPORT_TCP,
248 static int rtsp_read_packet(AVFormatContext *s, AVPacket *pkt)
250 RTSPState *rt = s->priv_data;
252 RTSPMessageHeader reply1, *reply = &reply1;
256 if (rt->server_type == RTSP_SERVER_REAL) {
259 for (i = 0; i < s->nb_streams; i++)
260 rt->real_setup[i] = s->streams[i]->discard;
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,
270 if (reply->status_code != RTSP_STATUS_OK)
271 return AVERROR_INVALIDDATA;
272 rt->need_subscription = 1;
276 if (rt->need_subscription) {
277 int r, rule_nr, first = 1;
279 memcpy(rt->real_setup_cache, rt->real_setup,
280 sizeof(enum AVDiscard) * s->nb_streams);
281 rt->last_subscription[0] = 0;
283 snprintf(cmd, sizeof(cmd),
285 for (i = 0; i < rt->nb_rtsp_streams; i++) {
287 for (r = 0; r < s->nb_streams; r++) {
288 if (s->streams[r]->id == i) {
289 if (s->streams[r]->discard != AVDISCARD_ALL) {
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);
302 av_strlcatf(cmd, sizeof(cmd), "%s\r\n", rt->last_subscription);
303 ff_rtsp_send_cmd(s, "SET_PARAMETER", rt->control_uri,
305 if (reply->status_code != RTSP_STATUS_OK)
306 return AVERROR_INVALIDDATA;
307 rt->need_subscription = 0;
309 if (rt->state == RTSP_STATE_STREAMING)
314 ret = ff_rtsp_fetch_packet(s, pkt);
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)
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,
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)
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);
349 ff_rtsp_send_cmd_async(s, "OPTIONS", "*", NULL);
356 static int rtsp_read_seek(AVFormatContext *s, int stream_index,
357 int64_t timestamp, int flags)
359 RTSPState *rt = s->priv_data;
361 rt->seek_timestamp = av_rescale_q(timestamp,
362 s->streams[stream_index]->time_base,
366 case RTSP_STATE_IDLE:
368 case RTSP_STATE_STREAMING:
369 if (rtsp_read_pause(s) != 0)
371 rt->state = RTSP_STATE_SEEKING;
372 if (rtsp_read_play(s) != 0)
375 case RTSP_STATE_PAUSED:
376 rt->state = RTSP_STATE_IDLE;
382 static int rtsp_read_close(AVFormatContext *s)
384 RTSPState *rt = s->priv_data;
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);
392 ff_rtsp_send_cmd_async(s, "TEARDOWN", rt->control_uri, NULL);
394 ff_rtsp_close_streams(s);
395 ff_rtsp_close_connections(s);
397 rt->real_setup = NULL;
398 av_freep(&rt->real_setup_cache);
402 static const AVOption options[] = {
403 { "initial_pause", "Don't start playing the stream immediately", offsetof(RTSPState, initial_pause), FF_OPT_TYPE_INT, {.dbl = 0}, 0, 1, AV_OPT_FLAG_DECODING_PARAM },
407 const AVClass rtsp_demuxer_class = {
408 .class_name = "RTSP demuxer",
409 .item_name = av_default_item_name,
411 .version = LIBAVUTIL_VERSION_INT,
414 AVInputFormat ff_rtsp_demuxer = {
416 .long_name = NULL_IF_CONFIG_SMALL("RTSP input format"),
417 .priv_data_size = sizeof(RTSPState),
418 .read_probe = rtsp_probe,
419 .read_header = rtsp_read_header,
420 .read_packet = rtsp_read_packet,
421 .read_close = rtsp_read_close,
422 .read_seek = rtsp_read_seek,
423 .flags = AVFMT_NOFILE,
424 .read_play = rtsp_read_play,
425 .read_pause = rtsp_read_pause,
426 .priv_class = &rtsp_demuxer_class,