3 * Copyright (c) 2010 Martin Storsjo
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
29 #include "os_support.h"
32 #include "avio_internal.h"
33 #include "libavutil/intreadwrite.h"
34 #include "libavutil/avstring.h"
37 #define SDP_MAX_SIZE 16384
39 int ff_rtsp_setup_output_streams(AVFormatContext *s, const char *addr)
41 RTSPState *rt = s->priv_data;
42 RTSPMessageHeader reply1, *reply = &reply1;
45 AVFormatContext sdp_ctx, *ctx_array[1];
47 s->start_time_realtime = av_gettime();
49 /* Announce the stream */
50 sdp = av_mallocz(SDP_MAX_SIZE);
52 return AVERROR(ENOMEM);
53 /* We create the SDP based on the RTSP AVFormatContext where we
54 * aren't allowed to change the filename field. (We create the SDP
55 * based on the RTSP context since the contexts for the RTP streams
56 * don't exist yet.) In order to specify a custom URL with the actual
57 * peer IP instead of the originally specified hostname, we create
58 * a temporary copy of the AVFormatContext, where the custom URL is set.
60 * FIXME: Create the SDP without copying the AVFormatContext.
61 * This either requires setting up the RTP stream AVFormatContexts
62 * already here (complicating things immensely) or getting a more
63 * flexible SDP creation interface.
66 ff_url_join(sdp_ctx.filename, sizeof(sdp_ctx.filename),
67 "rtsp", NULL, addr, -1, NULL);
68 ctx_array[0] = &sdp_ctx;
69 if (avf_sdp_create(ctx_array, 1, sdp, SDP_MAX_SIZE)) {
71 return AVERROR_INVALIDDATA;
73 av_log(s, AV_LOG_VERBOSE, "SDP:\n%s\n", sdp);
74 ff_rtsp_send_cmd_with_content(s, "ANNOUNCE", rt->control_uri,
75 "Content-Type: application/sdp\r\n",
76 reply, NULL, sdp, strlen(sdp));
78 if (reply->status_code != RTSP_STATUS_OK)
79 return AVERROR_INVALIDDATA;
81 /* Set up the RTSPStreams for each AVStream */
82 for (i = 0; i < s->nb_streams; i++) {
85 rtsp_st = av_mallocz(sizeof(RTSPStream));
87 return AVERROR(ENOMEM);
88 dynarray_add(&rt->rtsp_streams, &rt->nb_rtsp_streams, rtsp_st);
90 rtsp_st->stream_index = i;
92 av_strlcpy(rtsp_st->control_url, rt->control_uri, sizeof(rtsp_st->control_url));
93 /* Note, this must match the relative uri set in the sdp content */
94 av_strlcatf(rtsp_st->control_url, sizeof(rtsp_st->control_url),
101 static int rtsp_write_record(AVFormatContext *s)
103 RTSPState *rt = s->priv_data;
104 RTSPMessageHeader reply1, *reply = &reply1;
107 snprintf(cmd, sizeof(cmd),
108 "Range: npt=0.000-\r\n");
109 ff_rtsp_send_cmd(s, "RECORD", rt->control_uri, cmd, reply, NULL);
110 if (reply->status_code != RTSP_STATUS_OK)
112 rt->state = RTSP_STATE_STREAMING;
116 static int rtsp_write_header(AVFormatContext *s)
120 ret = ff_rtsp_connect(s);
124 if (rtsp_write_record(s) < 0) {
125 ff_rtsp_close_streams(s);
126 ff_rtsp_close_connections(s);
127 return AVERROR_INVALIDDATA;
132 static int tcp_write_packet(AVFormatContext *s, RTSPStream *rtsp_st)
134 RTSPState *rt = s->priv_data;
135 AVFormatContext *rtpctx = rtsp_st->transport_priv;
138 uint8_t *interleave_header, *interleaved_packet;
140 size = avio_close_dyn_buf(rtpctx->pb, &buf);
143 uint32_t packet_len = AV_RB32(ptr);
145 /* The interleaving header is exactly 4 bytes, which happens to be
146 * the same size as the packet length header from
147 * ffio_open_dyn_packet_buf. So by writing the interleaving header
148 * over these bytes, we get a consecutive interleaved packet
149 * that can be written in one call. */
150 interleaved_packet = interleave_header = ptr;
153 if (packet_len > size || packet_len < 2)
155 if (ptr[1] >= RTCP_SR && ptr[1] <= RTCP_APP)
156 id = rtsp_st->interleaved_max; /* RTCP */
158 id = rtsp_st->interleaved_min; /* RTP */
159 interleave_header[0] = '$';
160 interleave_header[1] = id;
161 AV_WB16(interleave_header + 2, packet_len);
162 ffurl_write(rt->rtsp_hd_out, interleaved_packet, 4 + packet_len);
167 ffio_open_dyn_packet_buf(&rtpctx->pb, RTSP_TCP_MAX_PACKET_SIZE);
171 static int rtsp_write_packet(AVFormatContext *s, AVPacket *pkt)
173 RTSPState *rt = s->priv_data;
176 struct pollfd p = {ffurl_get_file_handle(rt->rtsp_hd), POLLIN, 0};
177 AVFormatContext *rtpctx;
184 if (p.revents & POLLIN) {
185 RTSPMessageHeader reply;
187 /* Don't let ff_rtsp_read_reply handle interleaved packets,
188 * since it would block and wait for an RTSP reply on the socket
189 * (which may not be coming any time soon) if it handles
190 * interleaved packets internally. */
191 ret = ff_rtsp_read_reply(s, &reply, NULL, 1, NULL);
193 return AVERROR(EPIPE);
195 ff_rtsp_skip_packet(s);
196 /* XXX: parse message */
197 if (rt->state != RTSP_STATE_STREAMING)
198 return AVERROR(EPIPE);
202 if (pkt->stream_index < 0 || pkt->stream_index >= rt->nb_rtsp_streams)
203 return AVERROR_INVALIDDATA;
204 rtsp_st = rt->rtsp_streams[pkt->stream_index];
205 rtpctx = rtsp_st->transport_priv;
207 ret = ff_write_chained(rtpctx, 0, pkt, s);
208 /* ff_write_chained does all the RTP packetization. If using TCP as
209 * transport, rtpctx->pb is only a dyn_packet_buf that queues up the
210 * packets, so we need to send them out on the TCP connection separately.
212 if (!ret && rt->lower_transport == RTSP_LOWER_TRANSPORT_TCP)
213 ret = tcp_write_packet(s, rtsp_st);
217 static int rtsp_write_close(AVFormatContext *s)
219 RTSPState *rt = s->priv_data;
221 ff_rtsp_send_cmd_async(s, "TEARDOWN", rt->control_uri, NULL);
223 ff_rtsp_close_streams(s);
224 ff_rtsp_close_connections(s);
229 AVOutputFormat ff_rtsp_muxer = {
231 NULL_IF_CONFIG_SMALL("RTSP output format"),
240 .flags = AVFMT_NOFILE | AVFMT_GLOBALHEADER,