1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
|
/*
* RTSP muxer
* Copyright (c) 2010 Martin Storsjo
*
* This file is part of FFmpeg.
*
* FFmpeg is free software; you can redistribute it and/or
* modify it under the terms of the GNU Lesser General Public
* License as published by the Free Software Foundation; either
* version 2.1 of the License, or (at your option) any later version.
*
* FFmpeg is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
* Lesser General Public License for more details.
*
* You should have received a copy of the GNU Lesser General Public
* License along with FFmpeg; if not, write to the Free Software
* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
*/
#include "avformat.h"
#include <sys/time.h>
#if HAVE_SYS_SELECT_H
#include <sys/select.h>
#endif
#include "network.h"
#include "rtsp.h"
#include "internal.h"
#include "libavutil/intreadwrite.h"
static int rtsp_write_record(AVFormatContext *s)
{
RTSPState *rt = s->priv_data;
RTSPMessageHeader reply1, *reply = &reply1;
char cmd[1024];
snprintf(cmd, sizeof(cmd),
"Range: npt=%0.3f-\r\n",
(double) 0);
ff_rtsp_send_cmd(s, "RECORD", rt->control_uri, cmd, reply, NULL);
if (reply->status_code != RTSP_STATUS_OK)
return -1;
rt->state = RTSP_STATE_STREAMING;
return 0;
}
static int rtsp_write_header(AVFormatContext *s)
{
int ret;
ret = ff_rtsp_connect(s);
if (ret)
return ret;
if (rtsp_write_record(s) < 0) {
ff_rtsp_close_streams(s);
ff_rtsp_close_connections(s);
return AVERROR_INVALIDDATA;
}
return 0;
}
static int tcp_write_packet(AVFormatContext *s, RTSPStream *rtsp_st)
{
RTSPState *rt = s->priv_data;
AVFormatContext *rtpctx = rtsp_st->transport_priv;
uint8_t *buf, *ptr;
int size;
uint8_t *interleave_header, *interleaved_packet;
size = url_close_dyn_buf(rtpctx->pb, &buf);
ptr = buf;
while (size > 4) {
uint32_t packet_len = AV_RB32(ptr);
int id;
/* The interleaving header is exactly 4 bytes, which happens to be
* the same size as the packet length header from
* url_open_dyn_packet_buf. So by writing the interleaving header
* over these bytes, we get a consecutive interleaved packet
* that can be written in one call. */
interleaved_packet = interleave_header = ptr;
ptr += 4;
size -= 4;
if (packet_len > size || packet_len < 2)
break;
if (ptr[1] >= 200 && ptr[1] <= 204)
id = rtsp_st->interleaved_max; /* RTCP */
else
id = rtsp_st->interleaved_min; /* RTP */
interleave_header[0] = '$';
interleave_header[1] = id;
AV_WB16(interleave_header + 2, packet_len);
url_write(rt->rtsp_hd_out, interleaved_packet, 4 + packet_len);
ptr += packet_len;
size -= packet_len;
}
av_free(buf);
url_open_dyn_packet_buf(&rtpctx->pb, RTSP_TCP_MAX_PACKET_SIZE);
return 0;
}
static int rtsp_write_packet(AVFormatContext *s, AVPacket *pkt)
{
RTSPState *rt = s->priv_data;
RTSPStream *rtsp_st;
fd_set rfds;
int n, tcp_fd;
struct timeval tv;
AVFormatContext *rtpctx;
int ret;
tcp_fd = url_get_file_handle(rt->rtsp_hd);
while (1) {
FD_ZERO(&rfds);
FD_SET(tcp_fd, &rfds);
tv.tv_sec = 0;
tv.tv_usec = 0;
n = select(tcp_fd + 1, &rfds, NULL, NULL, &tv);
if (n <= 0)
break;
if (FD_ISSET(tcp_fd, &rfds)) {
RTSPMessageHeader reply;
/* Don't let ff_rtsp_read_reply handle interleaved packets,
* since it would block and wait for an RTSP reply on the socket
* (which may not be coming any time soon) if it handles
* interleaved packets internally. */
ret = ff_rtsp_read_reply(s, &reply, NULL, 1);
if (ret < 0)
return AVERROR(EPIPE);
if (ret == 1)
ff_rtsp_skip_packet(s);
/* XXX: parse message */
if (rt->state != RTSP_STATE_STREAMING)
return AVERROR(EPIPE);
}
}
if (pkt->stream_index < 0 || pkt->stream_index >= rt->nb_rtsp_streams)
return AVERROR_INVALIDDATA;
rtsp_st = rt->rtsp_streams[pkt->stream_index];
rtpctx = rtsp_st->transport_priv;
ret = ff_write_chained(rtpctx, 0, pkt, s);
/* ff_write_chained does all the RTP packetization. If using TCP as
* transport, rtpctx->pb is only a dyn_packet_buf that queues up the
* packets, so we need to send them out on the TCP connection separately.
*/
if (!ret && rt->lower_transport == RTSP_LOWER_TRANSPORT_TCP)
ret = tcp_write_packet(s, rtsp_st);
return ret;
}
static int rtsp_write_close(AVFormatContext *s)
{
RTSPState *rt = s->priv_data;
ff_rtsp_send_cmd_async(s, "TEARDOWN", rt->control_uri, NULL);
ff_rtsp_close_streams(s);
ff_rtsp_close_connections(s);
ff_network_close();
return 0;
}
AVOutputFormat rtsp_muxer = {
"rtsp",
NULL_IF_CONFIG_SMALL("RTSP output format"),
NULL,
NULL,
sizeof(RTSPState),
CODEC_ID_AAC,
CODEC_ID_MPEG4,
rtsp_write_header,
rtsp_write_packet,
rtsp_write_close,
.flags = AVFMT_NOFILE | AVFMT_GLOBALHEADER,
};
|
