/*
 * This file was ported to MPlayer from xine CVS rtsp_session.c,v 1.9 2003/02/11 16:20:40
 */

/*
 * Copyright (C) 2000-2002 the xine project
 *
 * This file is part of xine, a free video player.
 *
 * xine is free software; you can redistribute it and/or modify
 * it under the terms of the GNU General Public License as published by
 * the Free Software Foundation; either version 2 of the License, or
 * (at your option) any later version.
 *
 * xine 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 General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License
 * along with this program; if not, write to the Free Software
 * Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA  02111-1307, USA
 *
 *
 * high level interface to rtsp servers.
 *
 *    2006, Benjamin Zores and Vincent Mussard
 *      Support for MPEG-TS streaming through RFC compliant RTSP servers
 */

#include <sys/types.h>
#include "config.h"
#ifndef HAVE_WINSOCK2
#include <sys/socket.h>
#include <netinet/in.h>
#include <netdb.h>
#else
#include <winsock2.h>
#endif
#include <unistd.h>
#include <stdio.h>
#include <fcntl.h>
#include <stdlib.h>
#include <string.h>
#include <inttypes.h>

#include "mp_msg.h"
#include "../url.h"
#include "../rtp.h"
#include "rtsp.h"
#include "rtsp_rtp.h"
#include "rtsp_session.h"
#include "../realrtsp/real.h"
#include "../realrtsp/rmff.h"
#include "../realrtsp/asmrp.h"
#include "../realrtsp/xbuffer.h"

/*
#define LOG
*/

#define RTSP_OPTIONS_PUBLIC "Public"
#define RTSP_OPTIONS_SERVER "Server"
#define RTSP_OPTIONS_LOCATION "Location"
#define RTSP_OPTIONS_REAL "RealChallenge1"
#define RTSP_SERVER_TYPE_REAL "Real"
#define RTSP_SERVER_TYPE_HELIX "Helix"
#define RTSP_SERVER_TYPE_UNKNOWN "unknown"

struct rtsp_session_s {
  rtsp_t       *s;
  struct real_rtsp_session_t* real_session;
  struct rtp_rtsp_session_t* rtp_session;
};

//rtsp_session_t *rtsp_session_start(char *mrl) {
rtsp_session_t *rtsp_session_start(int fd, char **mrl, char *path, char *host, int port, int *redir, uint32_t bandwidth) {

  rtsp_session_t *rtsp_session = NULL;
  char *server;
  char *mrl_line = NULL;
  rmff_header_t *h;

  rtsp_session = malloc (sizeof (rtsp_session_t));
  rtsp_session->s = NULL;
  rtsp_session->real_session = NULL;
  rtsp_session->rtp_session = NULL;
 
//connect:
  *redir = 0;

  /* connect to server */
  rtsp_session->s=rtsp_connect(fd,*mrl,path,host,port,NULL);
  if (!rtsp_session->s)
  {
    mp_msg (MSGT_OPEN, MSGL_ERR,"rtsp_session: failed to connect to server %s\n", path);
    free(rtsp_session);
    return NULL;
  }

  /* looking for server type */
  if (rtsp_search_answers(rtsp_session->s,RTSP_OPTIONS_SERVER))
    server=strdup(rtsp_search_answers(rtsp_session->s,RTSP_OPTIONS_SERVER));
  else {
    if (rtsp_search_answers(rtsp_session->s,RTSP_OPTIONS_REAL))
      server=strdup(RTSP_SERVER_TYPE_REAL);
    else
      server=strdup(RTSP_SERVER_TYPE_UNKNOWN);
  }
  if (strstr(server,RTSP_SERVER_TYPE_REAL) || strstr(server,RTSP_SERVER_TYPE_HELIX))
  {
    /* we are talking to a real server ... */

    h=real_setup_and_get_header(rtsp_session->s, bandwidth);
    if (!h) {
      /* got an redirect? */
      if (rtsp_search_answers(rtsp_session->s, RTSP_OPTIONS_LOCATION))
      {
        free(mrl_line);
	mrl_line=strdup(rtsp_search_answers(rtsp_session->s, RTSP_OPTIONS_LOCATION));
        mp_msg (MSGT_OPEN, MSGL_INFO,"rtsp_session: redirected to %s\n", mrl_line);
	rtsp_close(rtsp_session->s);
	free(server);
        free(*mrl);
        free(rtsp_session);
        /* tell the caller to redirect, return url to redirect to in mrl */
        *mrl = mrl_line;
        *redir = 1;
        return NULL;
//	goto connect; /* *shudder* i made a design mistake somewhere */
      } else
      {
        mp_msg (MSGT_OPEN, MSGL_ERR,"rtsp_session: session can not be established.\n");
        rtsp_close(rtsp_session->s);
        free (server);
        free(rtsp_session);
        return NULL;
      }
    }
	
    rtsp_session->real_session = init_real_rtsp_session ();
    rtsp_session->real_session->header_len =
      rmff_dump_header (h, (char *) rtsp_session->real_session->header, 1024);

    rtsp_session->real_session->recv =
      xbuffer_copyin (rtsp_session->real_session->recv, 0,
                      rtsp_session->real_session->header,
                      rtsp_session->real_session->header_len);

    rtsp_session->real_session->recv_size =
      rtsp_session->real_session->header_len;
    rtsp_session->real_session->recv_read = 0;
  } else /* not a Real server : try RTP instead */
  {
    char *public = NULL;

    /* look for the Public: field in response to RTSP OPTIONS */
    if (!(public = rtsp_search_answers (rtsp_session->s, RTSP_OPTIONS_PUBLIC)))
    {
      rtsp_close (rtsp_session->s);
      free (server);
      free (mrl_line);
      free (rtsp_session);
      return NULL;
    }

    /* check for minimalistic RTSP RFC compliance */
    if (!strstr (public, RTSP_METHOD_DESCRIBE)
        || !strstr (public, RTSP_METHOD_SETUP)
        || !strstr (public, RTSP_METHOD_PLAY)
        || !strstr (public, RTSP_METHOD_TEARDOWN))
    {
      mp_msg (MSGT_OPEN, MSGL_ERR,
              "Remote server does not meet minimal RTSP 1.0 compliance.\n");
      rtsp_close (rtsp_session->s);
      free (server);
      free (mrl_line);
      free (rtsp_session);
      return NULL;
    }

    rtsp_session->rtp_session = rtp_setup_and_play (rtsp_session->s);

    /* neither a Real or an RTP server */
    if (!rtsp_session->rtp_session)
    {
      mp_msg (MSGT_OPEN, MSGL_ERR, "rtsp_session: unsupported RTSP server. ");
      mp_msg (MSGT_OPEN, MSGL_ERR, "Server type is '%s'.\n", server);
      rtsp_close (rtsp_session->s);
      free (server);
      free (mrl_line);
      free (rtsp_session);
      return NULL;
    }
  }
  free(server);
  
  return rtsp_session;
}

int rtsp_session_read (rtsp_session_t *this, char *data, int len) {
  
  if (this->real_session) {
  int to_copy=len;
  char *dest=data;
  char *source =
    (char *) (this->real_session->recv + this->real_session->recv_read);
  int fill = this->real_session->recv_size - this->real_session->recv_read;

  if (len < 0) return 0;
  while (to_copy > fill) {
    
    memcpy(dest, source, fill);
    to_copy -= fill;
    dest += fill;
    this->real_session->recv_read = 0;
    this->real_session->recv_size =
      real_get_rdt_chunk (this->s, (char **)&(this->real_session->recv));
    if (this->real_session->recv_size < 0)
      return -1;
    source = (char *) this->real_session->recv;
    fill = this->real_session->recv_size;

    if (this->real_session->recv_size == 0) {
#ifdef LOG
      mp_msg (MSGT_OPEN, MSGL_INFO, "librtsp: %d of %d bytes provided\n", len-to_copy, len);
#endif
      return len-to_copy;
    }
  }
  
  memcpy(dest, source, to_copy);
  this->real_session->recv_read += to_copy;

#ifdef LOG
  mp_msg (MSGT_OPEN, MSGL_INFO, "librtsp: %d bytes provided\n", len);
#endif

  return len;
  }
  else if (this->rtp_session)
  {
    int l = 0;

    l = read_rtp_from_server (this->rtp_session->rtp_socket, data, len);
    /* send RTSP and RTCP keepalive  */
    rtcp_send_rr (this->s, this->rtp_session);

    if (l == 0)
      rtsp_session_end (this);
    
    return l;
  }

  return 0;
}

void rtsp_session_end(rtsp_session_t *session) {

  rtsp_close(session->s);
  if (session->real_session)
    free_real_rtsp_session (session->real_session);
  if (session->rtp_session)
    rtp_session_free (session->rtp_session);
  free(session);
}
