1 /*
2 * RTSP muxer
3 * Copyright (c) 2010 Martin Storsjo
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 "avformat.h"
23
24 #if HAVE_POLL_H
25 #include <poll.h>
26 #endif
27 #include "mux.h"
28 #include "network.h"
29 #include "os_support.h"
30 #include "rtsp.h"
31 #include "internal.h"
32 #include "avio_internal.h"
33 #include "libavutil/intreadwrite.h"
34 #include "libavutil/avstring.h"
35 #include "libavutil/time.h"
36 #include "url.h"
37
38
39 static const AVClass rtsp_muxer_class = {
40 .class_name = "RTSP muxer",
41 .item_name = av_default_item_name,
42 .option = ff_rtsp_options,
43 .version = LIBAVUTIL_VERSION_INT,
44 };
45
ff_rtsp_setup_output_streams(AVFormatContext * s,const char * addr)46 int ff_rtsp_setup_output_streams(AVFormatContext *s, const char *addr)
47 {
48 RTSPState *rt = s->priv_data;
49 RTSPMessageHeader reply1, *reply = &reply1;
50 int i;
51 char *sdp;
52 AVFormatContext sdp_ctx, *ctx_array[1];
53 char url[MAX_URL_SIZE];
54
55 if (s->start_time_realtime == 0 || s->start_time_realtime == AV_NOPTS_VALUE)
56 s->start_time_realtime = av_gettime();
57
58 /* Announce the stream */
59 sdp = av_mallocz(SDP_MAX_SIZE);
60 if (!sdp)
61 return AVERROR(ENOMEM);
62 /* We create the SDP based on the RTSP AVFormatContext where we
63 * aren't allowed to change the filename field. (We create the SDP
64 * based on the RTSP context since the contexts for the RTP streams
65 * don't exist yet.) In order to specify a custom URL with the actual
66 * peer IP instead of the originally specified hostname, we create
67 * a temporary copy of the AVFormatContext, where the custom URL is set.
68 *
69 * FIXME: Create the SDP without copying the AVFormatContext.
70 * This either requires setting up the RTP stream AVFormatContexts
71 * already here (complicating things immensely) or getting a more
72 * flexible SDP creation interface.
73 */
74 sdp_ctx = *s;
75 sdp_ctx.url = url;
76 ff_url_join(url, sizeof(url),
77 "rtsp", NULL, addr, -1, NULL);
78 ctx_array[0] = &sdp_ctx;
79 if (av_sdp_create(ctx_array, 1, sdp, SDP_MAX_SIZE)) {
80 av_free(sdp);
81 return AVERROR_INVALIDDATA;
82 }
83 av_log(s, AV_LOG_VERBOSE, "SDP:\n%s\n", sdp);
84 ff_rtsp_send_cmd_with_content(s, "ANNOUNCE", rt->control_uri,
85 "Content-Type: application/sdp\r\n",
86 reply, NULL, sdp, strlen(sdp));
87 av_free(sdp);
88 if (reply->status_code != RTSP_STATUS_OK)
89 return ff_rtsp_averror(reply->status_code, AVERROR_INVALIDDATA);
90
91 /* Set up the RTSPStreams for each AVStream */
92 for (i = 0; i < s->nb_streams; i++) {
93 RTSPStream *rtsp_st;
94
95 rtsp_st = av_mallocz(sizeof(RTSPStream));
96 if (!rtsp_st)
97 return AVERROR(ENOMEM);
98 dynarray_add(&rt->rtsp_streams, &rt->nb_rtsp_streams, rtsp_st);
99
100 rtsp_st->stream_index = i;
101
102 av_strlcpy(rtsp_st->control_url, rt->control_uri, sizeof(rtsp_st->control_url));
103 /* Note, this must match the relative uri set in the sdp content */
104 av_strlcatf(rtsp_st->control_url, sizeof(rtsp_st->control_url),
105 "/streamid=%d", i);
106 }
107
108 return 0;
109 }
110
rtsp_write_record(AVFormatContext * s)111 static int rtsp_write_record(AVFormatContext *s)
112 {
113 RTSPState *rt = s->priv_data;
114 RTSPMessageHeader reply1, *reply = &reply1;
115 char cmd[MAX_URL_SIZE];
116
117 snprintf(cmd, sizeof(cmd),
118 "Range: npt=0.000-\r\n");
119 ff_rtsp_send_cmd(s, "RECORD", rt->control_uri, cmd, reply, NULL);
120 if (reply->status_code != RTSP_STATUS_OK)
121 return ff_rtsp_averror(reply->status_code, -1);
122 rt->state = RTSP_STATE_STREAMING;
123 return 0;
124 }
125
rtsp_write_header(AVFormatContext * s)126 static int rtsp_write_header(AVFormatContext *s)
127 {
128 int ret;
129
130 ret = ff_rtsp_connect(s);
131 if (ret)
132 return ret;
133
134 if (rtsp_write_record(s) < 0) {
135 ff_rtsp_close_streams(s);
136 ff_rtsp_close_connections(s);
137 return AVERROR_INVALIDDATA;
138 }
139 return 0;
140 }
141
ff_rtsp_tcp_write_packet(AVFormatContext * s,RTSPStream * rtsp_st)142 int ff_rtsp_tcp_write_packet(AVFormatContext *s, RTSPStream *rtsp_st)
143 {
144 RTSPState *rt = s->priv_data;
145 AVFormatContext *rtpctx = rtsp_st->transport_priv;
146 uint8_t *buf, *ptr;
147 int size;
148 uint8_t *interleave_header, *interleaved_packet;
149
150 size = avio_close_dyn_buf(rtpctx->pb, &buf);
151 rtpctx->pb = NULL;
152 ptr = buf;
153 while (size > 4) {
154 uint32_t packet_len = AV_RB32(ptr);
155 int id;
156 /* The interleaving header is exactly 4 bytes, which happens to be
157 * the same size as the packet length header from
158 * ffio_open_dyn_packet_buf. So by writing the interleaving header
159 * over these bytes, we get a consecutive interleaved packet
160 * that can be written in one call. */
161 interleaved_packet = interleave_header = ptr;
162 ptr += 4;
163 size -= 4;
164 if (packet_len > size || packet_len < 2)
165 break;
166 if (RTP_PT_IS_RTCP(ptr[1]))
167 id = rtsp_st->interleaved_max; /* RTCP */
168 else
169 id = rtsp_st->interleaved_min; /* RTP */
170 interleave_header[0] = '$';
171 interleave_header[1] = id;
172 AV_WB16(interleave_header + 2, packet_len);
173 ffurl_write(rt->rtsp_hd_out, interleaved_packet, 4 + packet_len);
174 ptr += packet_len;
175 size -= packet_len;
176 }
177 av_free(buf);
178 return ffio_open_dyn_packet_buf(&rtpctx->pb, rt->pkt_size);
179 }
180
rtsp_write_packet(AVFormatContext * s,AVPacket * pkt)181 static int rtsp_write_packet(AVFormatContext *s, AVPacket *pkt)
182 {
183 RTSPState *rt = s->priv_data;
184 RTSPStream *rtsp_st;
185 int n;
186 struct pollfd p = {ffurl_get_file_handle(rt->rtsp_hd), POLLIN, 0};
187 AVFormatContext *rtpctx;
188 int ret;
189
190 while (1) {
191 n = poll(&p, 1, 0);
192 if (n <= 0)
193 break;
194 if (p.revents & POLLIN) {
195 RTSPMessageHeader reply;
196
197 /* Don't let ff_rtsp_read_reply handle interleaved packets,
198 * since it would block and wait for an RTSP reply on the socket
199 * (which may not be coming any time soon) if it handles
200 * interleaved packets internally. */
201 ret = ff_rtsp_read_reply(s, &reply, NULL, 1, NULL);
202 if (ret < 0)
203 return AVERROR(EPIPE);
204 if (ret == 1) {
205 ret = ff_rtsp_skip_packet(s);
206 if (ret < 0)
207 return ret;
208 }
209 /* XXX: parse message */
210 if (rt->state != RTSP_STATE_STREAMING)
211 return AVERROR(EPIPE);
212 }
213 }
214
215 if (pkt->stream_index < 0 || pkt->stream_index >= rt->nb_rtsp_streams)
216 return AVERROR_INVALIDDATA;
217 rtsp_st = rt->rtsp_streams[pkt->stream_index];
218 rtpctx = rtsp_st->transport_priv;
219
220 ret = ff_write_chained(rtpctx, 0, pkt, s, 0);
221 /* ff_write_chained does all the RTP packetization. If using TCP as
222 * transport, rtpctx->pb is only a dyn_packet_buf that queues up the
223 * packets, so we need to send them out on the TCP connection separately.
224 */
225 if (!ret && rt->lower_transport == RTSP_LOWER_TRANSPORT_TCP)
226 ret = ff_rtsp_tcp_write_packet(s, rtsp_st);
227 return ret;
228 }
229
rtsp_write_close(AVFormatContext * s)230 static int rtsp_write_close(AVFormatContext *s)
231 {
232 RTSPState *rt = s->priv_data;
233
234 // If we want to send RTCP_BYE packets, these are sent by av_write_trailer.
235 // Thus call this on all streams before doing the teardown. This is
236 // done within ff_rtsp_undo_setup.
237 ff_rtsp_undo_setup(s, 1);
238
239 ff_rtsp_send_cmd_async(s, "TEARDOWN", rt->control_uri, NULL);
240
241 ff_rtsp_close_streams(s);
242 ff_rtsp_close_connections(s);
243 ff_network_close();
244 return 0;
245 }
246
247 const AVOutputFormat ff_rtsp_muxer = {
248 .name = "rtsp",
249 .long_name = NULL_IF_CONFIG_SMALL("RTSP output"),
250 .priv_data_size = sizeof(RTSPState),
251 .audio_codec = AV_CODEC_ID_AAC,
252 .video_codec = AV_CODEC_ID_MPEG4,
253 .write_header = rtsp_write_header,
254 .write_packet = rtsp_write_packet,
255 .write_trailer = rtsp_write_close,
256 .flags = AVFMT_NOFILE | AVFMT_GLOBALHEADER,
257 .priv_class = &rtsp_muxer_class,
258 };
259