PeerStreamer

/*

 * 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"

static int rtsp_write_record(AVFormatContext *s)

{

    RTSPState *rt = s->priv_data;

    RTSPMessageHeader reply1, *reply = &reply1;

    char cmd[1024];

    snprintf(cmd, sizeof(cmd),

             "RECORD %s RTSP/1.0\r\n"

             "Range: npt=%0.3f-\r\n",

             s->filename,

             (double) 0);

    rtsp_send_cmd(s, 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 = rtsp_connect(s);

    if (ret)

        return ret;

    if (rtsp_write_record(s) < 0) {

        rtsp_close_streams(s);

        url_close(rt->rtsp_hd);

        return AVERROR_INVALIDDATA;

    }

    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;

    FD_ZERO(&rfds);

    tcp_fd = url_get_file_handle(rt->rtsp_hd);

    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) {

        if (FD_ISSET(tcp_fd, &rfds)) {

            RTSPMessageHeader reply;

            if (rtsp_read_reply(s, &reply, NULL, 0) < 0)

                return AVERROR(EPIPE);

            /* 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;

    pkt->stream_index = 0;

    return av_write_frame(rtpctx, pkt);

}

static int rtsp_write_close(AVFormatContext *s)

{

    RTSPState *rt = s->priv_data;

    char cmd[1024];

    snprintf(cmd, sizeof(cmd),

             "TEARDOWN %s RTSP/1.0\r\n",

             s->filename);

    rtsp_send_cmd_async(s, cmd);

    rtsp_close_streams(s);

    url_close(rt->rtsp_hd);

    return 0;

}

AVOutputFormat rtsp_muxer = {

    "rtsp",

    NULL_IF_CONFIG_SMALL("RTSP output format"),

    NULL,

    NULL,

    sizeof(RTSPState),

    CODEC_ID_PCM_MULAW,

    CODEC_ID_NONE,

    rtsp_write_header,

    rtsp_write_packet,

    rtsp_write_close,

    .flags = AVFMT_NOFILE | AVFMT_GLOBALHEADER,

};