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"
28 #include "os_support.h"
34 //#define DEBUG_RTP_TCP
36 static int rtsp_read_play(AVFormatContext *s)
38 RTSPState *rt = s->priv_data;
39 RTSPMessageHeader reply1, *reply = &reply1;
43 av_log(s, AV_LOG_DEBUG, "hello state=%d\n", rt->state);
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;
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;
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,
154 AVFormatParameters *ap)
156 RTSPState *rt = s->priv_data;
159 ret = ff_rtsp_connect(s);
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;
168 if (ap->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;
189 av_dlog(s, "tcp_read_packet:\n");
193 RTSPMessageHeader reply;
195 ret = ff_rtsp_read_reply(s, &reply, NULL, 1, NULL);
198 if (ret == 1) /* received '$' */
200 /* XXX: parse message */
201 if (rt->state != RTSP_STATE_STREAMING)
204 ret = ffurl_read_complete(rt->rtsp_hd, buf, 3);
208 len = AV_RB16(buf + 1);
210 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_REAL) {
345 ff_rtsp_send_cmd_async(s, "GET_PARAMETER", rt->control_uri, NULL);
347 ff_rtsp_send_cmd_async(s, "OPTIONS", "*", NULL);
354 static int rtsp_read_seek(AVFormatContext *s, int stream_index,
355 int64_t timestamp, int flags)
357 RTSPState *rt = s->priv_data;
359 rt->seek_timestamp = av_rescale_q(timestamp,
360 s->streams[stream_index]->time_base,
364 case RTSP_STATE_IDLE:
366 case RTSP_STATE_STREAMING:
367 if (rtsp_read_pause(s) != 0)
369 rt->state = RTSP_STATE_SEEKING;
370 if (rtsp_read_play(s) != 0)
373 case RTSP_STATE_PAUSED:
374 rt->state = RTSP_STATE_IDLE;
380 static int rtsp_read_close(AVFormatContext *s)
382 RTSPState *rt = s->priv_data;
385 /* NOTE: it is valid to flush the buffer here */
386 if (rt->lower_transport == RTSP_LOWER_TRANSPORT_TCP) {
387 avio_close(&rt->rtsp_gb);
390 ff_rtsp_send_cmd_async(s, "TEARDOWN", rt->control_uri, NULL);
392 ff_rtsp_close_streams(s);
393 ff_rtsp_close_connections(s);
395 rt->real_setup = NULL;
396 av_freep(&rt->real_setup_cache);
400 AVInputFormat ff_rtsp_demuxer = {
402 NULL_IF_CONFIG_SMALL("RTSP input format"),
409 .flags = AVFMT_NOFILE,
410 .read_play = rtsp_read_play,
411 .read_pause = rtsp_read_pause,