Statistics
| Branch: | Revision:

ffmpeg / libavformat / rtspenc.c @ 72415b2a

History | View | Annotate | Download (5.21 KB)

1 6f5a3d0a Martin Storsjö
/*
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 b7dc88fc Martin Storsjö
#include <libavutil/intreadwrite.h>
31 6f5a3d0a Martin Storsjö
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
             "Range: npt=%0.3f-\r\n",
40
             (double) 0);
41 b17d11c6 Martin Storsjö
    ff_rtsp_send_cmd(s, "RECORD", rt->control_uri, cmd, reply, NULL);
42 6f5a3d0a Martin Storsjö
    if (reply->status_code != RTSP_STATUS_OK)
43
        return -1;
44
    rt->state = RTSP_STATE_STREAMING;
45
    return 0;
46
}
47
48
static int rtsp_write_header(AVFormatContext *s)
49
{
50
    RTSPState *rt = s->priv_data;
51
    int ret;
52
53 3307e6ea Ronald S. Bultje
    ret = ff_rtsp_connect(s);
54 6f5a3d0a Martin Storsjö
    if (ret)
55
        return ret;
56
57
    if (rtsp_write_record(s) < 0) {
58 3307e6ea Ronald S. Bultje
        ff_rtsp_close_streams(s);
59 6f5a3d0a Martin Storsjö
        url_close(rt->rtsp_hd);
60
        return AVERROR_INVALIDDATA;
61
    }
62
    return 0;
63
}
64
65 b7dc88fc Martin Storsjö
static int tcp_write_packet(AVFormatContext *s, RTSPStream *rtsp_st)
66
{
67
    RTSPState *rt = s->priv_data;
68
    AVFormatContext *rtpctx = rtsp_st->transport_priv;
69
    uint8_t *buf, *ptr;
70
    int size;
71
    uint8_t interleave_header[4];
72
73
    size = url_close_dyn_buf(rtpctx->pb, &buf);
74
    ptr = buf;
75
    while (size > 4) {
76
        uint32_t packet_len = AV_RB32(ptr);
77
        int id;
78
        ptr += 4;
79
        size -= 4;
80
        if (packet_len > size || packet_len < 2)
81
            break;
82
        if (ptr[1] >= 200 && ptr[1] <= 204)
83
            id = rtsp_st->interleaved_max; /* RTCP */
84
        else
85
            id = rtsp_st->interleaved_min; /* RTP */
86
        interleave_header[0] = '$';
87
        interleave_header[1] = id;
88
        AV_WB16(interleave_header + 2, packet_len);
89
        url_write(rt->rtsp_hd, interleave_header, 4);
90
        url_write(rt->rtsp_hd, ptr, packet_len);
91
        ptr += packet_len;
92
        size -= packet_len;
93
    }
94
    av_free(buf);
95
    url_open_dyn_packet_buf(&rtpctx->pb, RTSP_TCP_MAX_PACKET_SIZE);
96
    return 0;
97
}
98
99 6f5a3d0a Martin Storsjö
static int rtsp_write_packet(AVFormatContext *s, AVPacket *pkt)
100
{
101
    RTSPState *rt = s->priv_data;
102
    RTSPStream *rtsp_st;
103
    fd_set rfds;
104
    int n, tcp_fd;
105
    struct timeval tv;
106
    AVFormatContext *rtpctx;
107 50ff78db Martin Storsjö
    AVPacket local_pkt;
108 ad2ae6db Martin Storsjö
    int ret;
109 6f5a3d0a Martin Storsjö
110
    tcp_fd = url_get_file_handle(rt->rtsp_hd);
111
112 ad2ae6db Martin Storsjö
    while (1) {
113
        FD_ZERO(&rfds);
114
        FD_SET(tcp_fd, &rfds);
115 db128802 Martin Storsjö
        tv.tv_sec = 0;
116
        tv.tv_usec = 0;
117
        n = select(tcp_fd + 1, &rfds, NULL, NULL, &tv);
118 ad2ae6db Martin Storsjö
        if (n <= 0)
119
            break;
120 6f5a3d0a Martin Storsjö
        if (FD_ISSET(tcp_fd, &rfds)) {
121
            RTSPMessageHeader reply;
122
123 ad2ae6db Martin Storsjö
            /* Don't let ff_rtsp_read_reply handle interleaved packets,
124
             * since it would block and wait for an RTSP reply on the socket
125
             * (which may not be coming any time soon) if it handles
126
             * interleaved packets internally. */
127
            ret = ff_rtsp_read_reply(s, &reply, NULL, 1);
128
            if (ret < 0)
129 6f5a3d0a Martin Storsjö
                return AVERROR(EPIPE);
130 ad2ae6db Martin Storsjö
            if (ret == 1)
131
                ff_rtsp_skip_packet(s);
132 6f5a3d0a Martin Storsjö
            /* XXX: parse message */
133
            if (rt->state != RTSP_STATE_STREAMING)
134
                return AVERROR(EPIPE);
135
        }
136
    }
137
138
    if (pkt->stream_index < 0 || pkt->stream_index >= rt->nb_rtsp_streams)
139
        return AVERROR_INVALIDDATA;
140
    rtsp_st = rt->rtsp_streams[pkt->stream_index];
141
    rtpctx = rtsp_st->transport_priv;
142
143 50ff78db Martin Storsjö
    /* Use a local packet for writing to the chained muxer, otherwise
144
     * the internal stream_index = 0 becomes visible to the muxer user. */
145
    local_pkt = *pkt;
146
    local_pkt.stream_index = 0;
147 b7dc88fc Martin Storsjö
    ret = av_write_frame(rtpctx, &local_pkt);
148
    /* av_write_frame does all the RTP packetization. If using TCP as
149
     * transport, rtpctx->pb is only a dyn_packet_buf that queues up the
150
     * packets, so we need to send them out on the TCP connection separately.
151
     */
152
    if (!ret && rt->lower_transport == RTSP_LOWER_TRANSPORT_TCP)
153
        ret = tcp_write_packet(s, rtsp_st);
154
    return ret;
155 6f5a3d0a Martin Storsjö
}
156
157
static int rtsp_write_close(AVFormatContext *s)
158
{
159
    RTSPState *rt = s->priv_data;
160
161 b17d11c6 Martin Storsjö
    ff_rtsp_send_cmd_async(s, "TEARDOWN", rt->control_uri, NULL);
162 6f5a3d0a Martin Storsjö
163 3307e6ea Ronald S. Bultje
    ff_rtsp_close_streams(s);
164 6f5a3d0a Martin Storsjö
    url_close(rt->rtsp_hd);
165 57b5555c Martin Storsjö
    ff_network_close();
166 6f5a3d0a Martin Storsjö
    return 0;
167
}
168
169
AVOutputFormat rtsp_muxer = {
170
    "rtsp",
171
    NULL_IF_CONFIG_SMALL("RTSP output format"),
172
    NULL,
173
    NULL,
174
    sizeof(RTSPState),
175
    CODEC_ID_PCM_MULAW,
176
    CODEC_ID_NONE,
177
    rtsp_write_header,
178
    rtsp_write_packet,
179
    rtsp_write_close,
180
    .flags = AVFMT_NOFILE | AVFMT_GLOBALHEADER,
181
};