Add support for TCP as lower transport in the RTSP muxer
[libav.git] / libavformat / rtspenc.c
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 #include <sys/time.h>
25 #if HAVE_SYS_SELECT_H
26 #include <sys/select.h>
27 #endif
28 #include "network.h"
29 #include "rtsp.h"
30 #include <libavutil/intreadwrite.h>
31
32 static int rtsp_write_record(AVFormatContext *s)
33 {
34 RTSPState *rt = s->priv_data;
35 RTSPMessageHeader reply1, *reply = &reply1;
36 char cmd[1024];
37
38 snprintf(cmd, sizeof(cmd),
39 "RECORD %s RTSP/1.0\r\n"
40 "Range: npt=%0.3f-\r\n",
41 rt->control_uri,
42 (double) 0);
43 ff_rtsp_send_cmd(s, cmd, reply, NULL);
44 if (reply->status_code != RTSP_STATUS_OK)
45 return -1;
46 rt->state = RTSP_STATE_STREAMING;
47 return 0;
48 }
49
50 static int rtsp_write_header(AVFormatContext *s)
51 {
52 RTSPState *rt = s->priv_data;
53 int ret;
54
55 ret = ff_rtsp_connect(s);
56 if (ret)
57 return ret;
58
59 if (rtsp_write_record(s) < 0) {
60 ff_rtsp_close_streams(s);
61 url_close(rt->rtsp_hd);
62 return AVERROR_INVALIDDATA;
63 }
64 return 0;
65 }
66
67 static int tcp_write_packet(AVFormatContext *s, RTSPStream *rtsp_st)
68 {
69 RTSPState *rt = s->priv_data;
70 AVFormatContext *rtpctx = rtsp_st->transport_priv;
71 uint8_t *buf, *ptr;
72 int size;
73 uint8_t interleave_header[4];
74
75 size = url_close_dyn_buf(rtpctx->pb, &buf);
76 ptr = buf;
77 while (size > 4) {
78 uint32_t packet_len = AV_RB32(ptr);
79 int id;
80 ptr += 4;
81 size -= 4;
82 if (packet_len > size || packet_len < 2)
83 break;
84 if (ptr[1] >= 200 && ptr[1] <= 204)
85 id = rtsp_st->interleaved_max; /* RTCP */
86 else
87 id = rtsp_st->interleaved_min; /* RTP */
88 interleave_header[0] = '$';
89 interleave_header[1] = id;
90 AV_WB16(interleave_header + 2, packet_len);
91 url_write(rt->rtsp_hd, interleave_header, 4);
92 url_write(rt->rtsp_hd, ptr, packet_len);
93 ptr += packet_len;
94 size -= packet_len;
95 }
96 av_free(buf);
97 url_open_dyn_packet_buf(&rtpctx->pb, RTSP_TCP_MAX_PACKET_SIZE);
98 return 0;
99 }
100
101 static int rtsp_write_packet(AVFormatContext *s, AVPacket *pkt)
102 {
103 RTSPState *rt = s->priv_data;
104 RTSPStream *rtsp_st;
105 fd_set rfds;
106 int n, tcp_fd;
107 struct timeval tv;
108 AVFormatContext *rtpctx;
109 AVPacket local_pkt;
110 int ret;
111
112 tcp_fd = url_get_file_handle(rt->rtsp_hd);
113
114 while (1) {
115 FD_ZERO(&rfds);
116 FD_SET(tcp_fd, &rfds);
117 tv.tv_sec = 0;
118 tv.tv_usec = 0;
119 n = select(tcp_fd + 1, &rfds, NULL, NULL, &tv);
120 if (n <= 0)
121 break;
122 if (FD_ISSET(tcp_fd, &rfds)) {
123 RTSPMessageHeader reply;
124
125 /* Don't let ff_rtsp_read_reply handle interleaved packets,
126 * since it would block and wait for an RTSP reply on the socket
127 * (which may not be coming any time soon) if it handles
128 * interleaved packets internally. */
129 ret = ff_rtsp_read_reply(s, &reply, NULL, 1);
130 if (ret < 0)
131 return AVERROR(EPIPE);
132 if (ret == 1)
133 ff_rtsp_skip_packet(s);
134 /* XXX: parse message */
135 if (rt->state != RTSP_STATE_STREAMING)
136 return AVERROR(EPIPE);
137 }
138 }
139
140 if (pkt->stream_index < 0 || pkt->stream_index >= rt->nb_rtsp_streams)
141 return AVERROR_INVALIDDATA;
142 rtsp_st = rt->rtsp_streams[pkt->stream_index];
143 rtpctx = rtsp_st->transport_priv;
144
145 /* Use a local packet for writing to the chained muxer, otherwise
146 * the internal stream_index = 0 becomes visible to the muxer user. */
147 local_pkt = *pkt;
148 local_pkt.stream_index = 0;
149 ret = av_write_frame(rtpctx, &local_pkt);
150 /* av_write_frame does all the RTP packetization. If using TCP as
151 * transport, rtpctx->pb is only a dyn_packet_buf that queues up the
152 * packets, so we need to send them out on the TCP connection separately.
153 */
154 if (!ret && rt->lower_transport == RTSP_LOWER_TRANSPORT_TCP)
155 ret = tcp_write_packet(s, rtsp_st);
156 return ret;
157 }
158
159 static int rtsp_write_close(AVFormatContext *s)
160 {
161 RTSPState *rt = s->priv_data;
162 char cmd[1024];
163
164 snprintf(cmd, sizeof(cmd),
165 "TEARDOWN %s RTSP/1.0\r\n",
166 rt->control_uri);
167 ff_rtsp_send_cmd_async(s, cmd);
168
169 ff_rtsp_close_streams(s);
170 url_close(rt->rtsp_hd);
171 ff_network_close();
172 return 0;
173 }
174
175 AVOutputFormat rtsp_muxer = {
176 "rtsp",
177 NULL_IF_CONFIG_SMALL("RTSP output format"),
178 NULL,
179 NULL,
180 sizeof(RTSPState),
181 CODEC_ID_PCM_MULAW,
182 CODEC_ID_NONE,
183 rtsp_write_header,
184 rtsp_write_packet,
185 rtsp_write_close,
186 .flags = AVFMT_NOFILE | AVFMT_GLOBALHEADER,
187 };
188