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/*
* 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)
{
RTSPState *rt = s->priv_data;
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, 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,
};
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