osip_rfc3264.c

嵌入式产品中的osip的源代码.

/*
  The oSIP library implements the Session Initiation Protocol (SIP -rfc3261-)
  Copyright (C) 2001,2002,2003  Aymeric MOIZARD [e-mail]
  
  This library 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.
  
  This library 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 this library; if not, write to the Free Software
  Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
*/

#include <stdlib.h>

#include <osipparser2/osip_port.h>
#include <osipparser2/osip_rfc3264.h>
#include <osip_rfc3264i.h> /* internal include */

/**
 * Initialize negotiation facility..
 * @param config The element to work on.
 */
int osip_rfc3264_init (struct osip_rfc3264 **config)
{
  osip_rfc3264_t *cnf;
  *config = NULL;
  cnf = (osip_rfc3264_t *) osip_malloc (sizeof(osip_rfc3264_t));
  if (cnf==NULL)
    return -1;
  memset(cnf, 0, sizeof(osip_rfc3264_t));
  *config = cnf;
  return 0;
}


/**
 * Free negotiation facility.
 * @param config The element to work on.
 */
void osip_rfc3264_free (struct osip_rfc3264 *config)
{
  osip_rfc3264_t *cnf = (osip_rfc3264_t*) config;
  int i;
  if (config==NULL) return;

  for (i=0;i<MAX_AUDIO_CODECS; i++)
    {
      if (cnf->audio_medias[i]!=NULL)
	{
	  sdp_media_free(cnf->audio_medias[i]);
	  cnf->audio_medias[i] = NULL;
	}
    }
  for (i=0;i<MAX_VIDEO_CODECS; i++)
    {
      if (cnf->video_medias[i]!=NULL)
	{
	  sdp_media_free(cnf->video_medias[i]);
	  cnf->video_medias[i] = NULL;
	}
    }
  for (i=0;i<MAX_T38_CODECS; i++)
    {
      if (cnf->t38_medias[i]!=NULL)
	{
	  sdp_media_free(cnf->t38_medias[i]);
	  cnf->t38_medias[i] = NULL;
	}
    }
  for (i=0;i<MAX_APP_CODECS; i++)
    {
      if (cnf->app_medias[i]!=NULL)
	{
	  sdp_media_free(cnf->app_medias[i]);
	  cnf->app_medias[i] = NULL;
	}
    }
  osip_free(cnf);
}


/**
 * Test if a media exist in the configuration.
 * @param config The element to work on.
 * @param pos The index of the media element.
 */
int osip_rfc3264_endof_media (struct osip_rfc3264 *config, int pos)
{
  if (config==NULL) return -1;

  return 0;
}


/**
 * Get a media from the configuration.
 * @param config The element to work on.
 * @param pos The index of the media element to get.
 */
sdp_media_t *osip_rfc3264_get (struct osip_rfc3264 *config, int pos)
{
  if (config==NULL) return NULL;

  return NULL;
}


/**
 * Remove a media from the configuration.
 * @param config The element to work on.
 * @param pos The index of the media element to remove.
 */
int osip_rfc3264_remove (struct osip_rfc3264 *config, int pos)
{
  if (config==NULL) return -1;

  return 0;
}


/**
 * Remove all medias from the configuration.
 * @param config The element to work on.
 */
int osip_rfc3264_reset_media (struct osip_rfc3264 *config)
{
  if (config==NULL) return -1;

  return 0;
}


/**
 * Add a media (for audio) in the configuration.
 * @param config The element to work on.
 * @param pos The index of the media element to add.
 */
int osip_rfc3264_add_audio_media (struct osip_rfc3264 *config, sdp_media_t *med, int pos)
{
  osip_rfc3264_t *cnf = (osip_rfc3264_t*) config;
  if (config==NULL) return -1;
  if (pos>=MAX_AUDIO_CODECS) return -1;

  if (pos==-1)
    {
      for (pos=0;pos<MAX_AUDIO_CODECS && cnf->audio_medias[pos]!=NULL; pos++)
	{ }
    }
  if (pos>=MAX_AUDIO_CODECS) return -1; /* no space left */

  cnf->audio_medias[pos] = med;
  return 0;
}


/**
 * Remove a media in the configuration.
 * @param config The element to work on.
 * @param pos The index of the media element to remove.
 */
int osip_rfc3264_del_audio_media (struct osip_rfc3264 *config, int pos)
{
  osip_rfc3264_t *cnf = (osip_rfc3264_t*) config;
  if (config==NULL) return -1;
  if (pos>=MAX_AUDIO_CODECS) return -1;
  sdp_media_free(cnf->audio_medias[pos]);
  cnf->audio_medias[pos] = NULL;
  return 0;
}

/**
 * Add a media (for video) in the configuration.
 * @param config The element to work on.
 * @param pos The index of the media element to add.
 */
int osip_rfc3264_add_video_media (struct osip_rfc3264 *config, sdp_media_t *med, int pos)
{
  osip_rfc3264_t *cnf = (osip_rfc3264_t*) config;
  if (config==NULL) return -1;
  if (pos>=MAX_VIDEO_CODECS) return -1;

  if (pos==-1)
    {
      for (pos=0;pos<MAX_VIDEO_CODECS && cnf->video_medias[pos]!=NULL; pos++)
	{ }
    }
  if (pos>=MAX_VIDEO_CODECS) return -1; /* no space left */

  cnf->video_medias[pos] = med;
  return 0;
}


/**
 * Remove a media in the configuration.
 * @param config The element to work on.
 * @param pos The index of the media element to remove.
 */
int osip_rfc3264_del_video_media (struct osip_rfc3264 *config, int pos)
{
  osip_rfc3264_t *cnf = (osip_rfc3264_t*) config;
  if (config==NULL) return -1;
  if (pos>=MAX_VIDEO_CODECS) return -1;
  sdp_media_free(cnf->video_medias[pos]);
  cnf->video_medias[pos] = NULL;
  return 0;
}

/**
 * Add a media (for t38) in the configuration.
 * @param config The element to work on.
 * @param pos The index of the media element to add.
 */
int osip_rfc3264_add_t38_media (struct osip_rfc3264 *config, sdp_media_t *med, int pos)
{
  osip_rfc3264_t *cnf = (osip_rfc3264_t*) config;
  if (config==NULL) return -1;
  if (pos>=MAX_T38_CODECS) return -1;

  if (pos==-1)
    {
      for (pos=0;pos<MAX_T38_CODECS && cnf->t38_medias[pos]!=NULL; pos++)
	{ }
    }
  if (pos>=MAX_T38_CODECS) return -1; /* no space left */

  cnf->t38_medias[pos] = med;
  return 0;
}


/**
 * Remove a media in the configuration.
 * @param config The element to work on.
 * @param pos The index of the media element to remove.
 */
int osip_rfc3264_del_t38_media (struct osip_rfc3264 *config, int pos)
{
  osip_rfc3264_t *cnf = (osip_rfc3264_t*) config;
  if (config==NULL) return -1;
  if (pos>=MAX_T38_CODECS) return -1;
  sdp_media_free(cnf->t38_medias[pos]);
  cnf->t38_medias[pos] = NULL;
  return 0;
}

/**
 * Search for support of a special codec.
 * @param config The element to work on.
 */
  sdp_media_t *osip_rfc3264_find_audio (struct osip_rfc3264 *config, char *payload,
					char *rtpmap)
{
  osip_rfc3264_t *cnf = (osip_rfc3264_t*) config;
  int i;
  if (config==NULL) return NULL;

  if (rtpmap==NULL)
    {
      for (i=0;i<MAX_AUDIO_CODECS; i++)
	{
	  if (cnf->audio_medias[i]!=NULL)
	    {
	      sdp_media_t *med = cnf->audio_medias[i];
	      char *str = (char *) osip_list_get (med->m_payloads, 0);
	      /* static payload?: only compare payload number */
	      if (strlen(str)==strlen(payload)
		  && 0==osip_strcasecmp(str, payload))
		return med;
	    }
	}
      return NULL;
    }

  for (i=0;i<MAX_AUDIO_CODECS; i++)
    {
      if (cnf->audio_medias[i]!=NULL)
	{
	  sdp_media_t *med = cnf->audio_medias[i];

	  int pos = 0;
	  while (!osip_list_eol (med->a_attributes, pos))
	    {
	      sdp_attribute_t *attr =
		(sdp_attribute_t *) osip_list_get (med->a_attributes, pos);

	      if (0==osip_strcasecmp("rtpmap", attr->a_att_field)
		  &&  attr->a_att_value!=NULL)
		{
		  char *tmp = strchr(attr->a_att_value, ' ');
		  char *tmp2 = strchr(rtpmap, ' ');
		  if (tmp!=NULL && tmp2!=NULL)
		    {
		      if (0==osip_strcasecmp(tmp,tmp2))
			return med;
		    }
		}
	      pos++;
	    }
	}
    }

  return NULL;
}

/**
 * Search for support of a special codec.
 * @param config The element to work on.
 */
  sdp_media_t *osip_rfc3264_find_video (struct osip_rfc3264 *config, char *payload,
					char *rtpmap)
{
  osip_rfc3264_t *cnf = (osip_rfc3264_t*) config;
  int i;
  if (config==NULL) return NULL;

  if (rtpmap==NULL)
    {
      for (i=0;i<MAX_VIDEO_CODECS; i++)
	{
	  if (cnf->video_medias[i]!=NULL)
	    {
	      sdp_media_t *med = cnf->video_medias[i];
	      char *str = (char *) osip_list_get (med->m_payloads, 0);
	      /* static payload?: only compare payload number */
	      if (strlen(str)==strlen(payload)
		  && 0==osip_strcasecmp(str, payload))
		return med;
	    }
	}
      return NULL;
    }

  for (i=0;i<MAX_VIDEO_CODECS; i++)
    {
      if (cnf->video_medias[i]!=NULL)
	{
	  sdp_media_t *med = cnf->video_medias[i];

	  int pos = 0;
	  while (!osip_list_eol (med->a_attributes, pos))
	    {
	      sdp_attribute_t *attr =
		(sdp_attribute_t *) osip_list_get (med->a_attributes, pos);

	      if (0==osip_strcasecmp("rtpmap", attr->a_att_field)
		  &&  attr->a_att_value!=NULL)
		{
		  char *tmp = strchr(attr->a_att_value, ' ');
		  char *tmp2 = strchr(rtpmap, ' ');
		  if (tmp!=NULL && tmp2!=NULL)
		    {
		      if (0==osip_strcasecmp(tmp,tmp2))
			return med;
		    }
		}
	      pos++;
	    }
	}
    }

  return NULL;
}

/**
 * Search for support of a special codec.
 * @param config The element to work on.
 */
  sdp_media_t *osip_rfc3264_find_t38 (struct osip_rfc3264 *config, char *payload)
{
  osip_rfc3264_t *cnf = (osip_rfc3264_t*) config;
  if (config==NULL) return NULL;
  return NULL;
}

/**
 * Search for support of a special codec.
 * @param config The element to work on.
 */
  sdp_media_t *osip_rfc3264_find_app (struct osip_rfc3264 *config, char *payload)
{
  osip_rfc3264_t *cnf = (osip_rfc3264_t*) config;
  if (config==NULL) return NULL;
  return NULL;
}

/**
 * Compare remote sdp packet against local supported media.
 *    Only one media line is checked.
 *
 * @param config The element to work on.
 * @param remote_sdp The remote SDP packet.
 * @param audio_tab The local list of media supported by both side.
 * @param video_tab The local list of media supported by both side.
 * @param t38_tab The local list of media supported by both side.
 * @param app_tab The local list of media supported by both side.
 * @param pos_media The position of the media line to match.
 */
int osip_rfc3264_match(struct osip_rfc3264 *config,
		       sdp_message_t *remote_sdp,
		       sdp_media_t *audio_tab[],
		       sdp_media_t *video_tab[],
		       sdp_media_t *t38_tab[],
		       sdp_media_t *app_tab[],
		       int pos_media)
{
  sdp_media_t *remote_med;
  int pos;

  audio_tab[0] = NULL;
  video_tab[0] = NULL;
  t38_tab[0] = NULL;
  app_tab[0] = NULL;

  if (config==NULL) return -1;

  pos=0;
  while (!sdp_message_endof_media (remote_sdp, pos))
    {
      if (pos_media==0)
	{
	  remote_med = osip_list_get (remote_sdp->m_medias, pos);
	  if (remote_med->m_media!=NULL
	      && 0 == osip_strcasecmp (remote_med->m_media, "audio"))
	    {
	      osip_rfc3264_match_audio(config, remote_sdp, remote_med, audio_tab);
	    }
	  else if (remote_med->m_media!=NULL
		   && 0 == osip_strcasecmp (remote_med->m_media, "video"))
	    {
	      osip_rfc3264_match_video(config, remote_sdp, remote_med, video_tab);
	    }
	  else if (remote_med->m_media!=NULL
		   && 0 == osip_strcasecmp (remote_med->m_media, "image"))
	    {
	      osip_rfc3264_match_t38(config, remote_sdp, remote_med, t38_tab);
	    }
	  else if (remote_med->m_media!=NULL
		   && 0 == osip_strcasecmp (remote_med->m_media, "application"))
	    {
	      osip_rfc3264_match_app(config, remote_sdp, remote_med, app_tab);
	    }
	  return 0;
	}

      remote_med=NULL;
      pos++;
      pos_media--;
    }

  return -1;
}

/**
 * Compare remote sdp packet against local supported media for audio.
 * @param config The element to work on.
 * @param remote_sdp The remote SDP packet.
 * @param remote_med The remote Media SDP line.
 * @param audio_tab The local list of media supported by both side.
 */
int osip_rfc3264_match_audio(struct osip_rfc3264 *config,
			     sdp_message_t *remote_sdp,
			     sdp_media_t *remote_med,
			     sdp_media_t *audio_tab[])
{
  osip_rfc3264_t *cnf = (osip_rfc3264_t*) config;
  int num=0;
  int pos;
  audio_tab[0] = NULL;

  if (cnf==NULL) return -1;

  /* search for the audio media line */
  pos=0;
  while (!osip_list_eol (remote_med->m_payloads, pos))
    {
      char *payload = (char *) osip_list_get (remote_med->m_payloads, pos);
      sdp_media_t *local_med;
      char *rtpmap = NULL;
      int posattr = 0;

      /* search for the rtpmap associated to the payload */
      while (!osip_list_eol (remote_med->a_attributes, posattr))
	{
	  sdp_attribute_t *attr =
	    (sdp_attribute_t *) osip_list_get (remote_med->a_attributes, posattr);
	  if (0==osip_strncasecmp(attr->a_att_field, "rtpmap", 6))
	    {
	      if (attr->a_att_value!=NULL &&
		  0==osip_strncasecmp(attr->a_att_value, payload, strlen(payload)))
		{
		  /* TODO check if it was not like 101: == 10 */
		  rtpmap = attr->a_att_value;
		  break;
		}
	    }