osip_rfc3264.c

嵌入式产品中的osip的源代码.

	  posattr++;
	}

      local_med = osip_rfc3264_find_audio(config, payload, rtpmap);
      if (local_med!=NULL)
	{
	  /* found a supported codec? */
	  audio_tab[num] = local_med;
	  num++;
	}

      /* search for support of this codec in local media list */
      pos++;
    }

  audio_tab[num] = NULL;
  return 0;
}

/**
 * Compare remote sdp packet against local supported media for video.
 * @param config The element to work on.
 * @param remote_sdp The remote SDP packet.
 * @param remote_med The remote Media SDP line.
 * @param video_tab The local list of media supported by both side.
 */
int osip_rfc3264_match_video(struct osip_rfc3264 *config,
			     sdp_message_t *remote_sdp,
			     sdp_media_t *remote_med,
			     sdp_media_t *video_tab[])
{
  osip_rfc3264_t *cnf = (osip_rfc3264_t*) config;
  int num=0;
  int pos;
  video_tab[0] = NULL;

  if (cnf==NULL) return -1;

  /* search for the video 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;
		}
	    }
	  posattr++;
	}

      local_med = osip_rfc3264_find_video(config, payload, rtpmap);
      if (local_med!=NULL)
	{
	  /* found a supported codec? */
	  video_tab[num] = local_med;
	  num++;
	}

      /* search for support of this codec in local media list */
      pos++;
    }

  video_tab[num] = NULL;
  return 0;
}

/**
 * Compare remote sdp packet against local supported media for t38.
 * @param config The element to work on.
 * @param remote_sdp The remote SDP packet.
 * @param remote_med The remote Media SDP line.
 * @param t38_tab The local list of media supported by both side.
 */
int osip_rfc3264_match_t38(struct osip_rfc3264 *config,
			   sdp_message_t *remote_sdp,
			   sdp_media_t *remote_med,
			   sdp_media_t *t38_tab[])
{
  osip_rfc3264_t *cnf = (osip_rfc3264_t*) config;

  t38_tab[0] = NULL;

  if (cnf==NULL) return -1;

  return 0;
}

/**
 * Compare remote sdp packet against local supported media for application.
 * @param config The element to work on.
 * @param remote_sdp The remote SDP packet.
 * @param remote_med The remote Media SDP line.
 * @param app_tab The local list of media supported by both side.
 */
int osip_rfc3264_match_app(struct osip_rfc3264 *config,
			   sdp_message_t *remote_sdp,
			   sdp_media_t *remote_med,
			   sdp_media_t *app_tab[])
{
  osip_rfc3264_t *cnf = (osip_rfc3264_t*) config;

  app_tab[0] = NULL;

  if (cnf==NULL) return -1;

  return 0;
}


/**
 * Prepare an uncomplete answer.
 * @param config The element to work on.
 * @param remote_sdp The remote SDP packet.
 * @param local_sdp The local SDP packet to prepare.
 * @param length The local SDP packet's length.
 */
int osip_rfc3264_prepare_answer(struct osip_rfc3264 *config,
				sdp_message_t *remote_sdp,
				char *local_sdp, int length)
{
  int pos, pos2;
  if (config==NULL) return -1;
  if (remote_sdp==NULL) return -1;

  if (osip_list_size(remote_sdp->t_descrs)>0)

#if (defined WIN32 || defined _WIN32_WCE)   
  _snprintf(local_sdp, 4096,
	   "v=0\r\n\
o=userX 20000001 20000001 IN IP4 TOREPLACE\r\n\
s=-\r\n\
c=IN IP4 TOREPLACE\r\n");
#else
  snprintf(local_sdp, 4096,
	   "v=0\r\n\
o=userX 20000001 20000001 IN IP4 TOREPLACE\r\n\
s=-\r\n\
c=IN IP4 TOREPLACE\r\n");
#endif
  /* Fill t= (and r=) fields */
  pos=0;
  while (!osip_list_eol(remote_sdp->t_descrs, pos))
    {
      char tmp[100];
      sdp_time_descr_t *td;
      td = (sdp_time_descr_t *) osip_list_get(remote_sdp->t_descrs, pos);
      if (td->t_start_time!=NULL && td->t_stop_time!=NULL)
#if (defined WIN32 || defined _WIN32_WCE)   
	  _snprintf(tmp, 100, "t=%s %s\r\n", td->t_start_time, td->t_stop_time);
#else
      snprintf(tmp, 100, "t=%s %s\r\n", td->t_start_time, td->t_stop_time);
#endif
      else
#if (defined WIN32 || defined _WIN32_WCE)        
	_snprintf(tmp, 100, "t=0 0\r\n");
#else
	snprintf(tmp, 100, "t=0 0\r\n");
#endif
      if ((int)(strlen(local_sdp)+strlen(tmp)+1)<length)

	{
	  strcat(local_sdp, tmp);

	  pos2 = 0;
	  while (!osip_list_eol (td->r_repeats, pos2))
	    {
	      char *str = (char *) osip_list_get (td->r_repeats, pos2);

	      if ((int)(strlen(local_sdp)+strlen(str)+5+1)<length)
	      {
		strcat(local_sdp, "r=");
		strcat(local_sdp, str);
		strcat(local_sdp, "\r\n");
	      }
	      else
		return -1;
	      pos2++;
	    }
	}
      else
	return -1;
      pos++;
    }


  pos=0;
  while (!osip_list_eol(remote_sdp->m_medias, pos))
    {
      int posattr = 0;
      char tmp[200];
      char tmp2[200];
      char inactive='X';
      sdp_media_t *med;

#if (defined WIN32 || defined _WIN32_WCE)   
      _snprintf(tmp2, 199, "\r\n");
#else
      snprintf(tmp2, 199, "\r\n");
#endif
      med = (sdp_media_t *) osip_list_get(remote_sdp->m_medias, pos);

      /* search for the rtpmap associated to the payload */
      while (!osip_list_eol (med->a_attributes, posattr))
	{
	  sdp_attribute_t *attr =
	    (sdp_attribute_t *) osip_list_get (med->a_attributes, posattr);
	  if (strlen(attr->a_att_field)==8 && attr->a_att_value==NULL)
	    {
	      if (0==osip_strncasecmp(attr->a_att_field, "sendonly", 8))
		{
#if (defined WIN32 || defined _WIN32_WCE)   
		  _snprintf(tmp2, 199, "\r\na=recvonly\r\n");
#else
		  snprintf(tmp2, 199, "\r\na=recvonly\r\n");
#endif
		  break;
		}
	      else if (0==osip_strncasecmp(attr->a_att_field, "recvonly", 8))
		{
#if (defined WIN32 || defined _WIN32_WCE) 
		  _snprintf(tmp2, 199, "\r\na=sendonly\r\n");
#else
		  snprintf(tmp2, 199, "\r\na=sendonly\r\n");
#endif
		  break;
		}
	      else if (0==osip_strncasecmp(attr->a_att_field, "sendrecv", 8))
		{
		  break;
		}
	      else if (0==osip_strncasecmp(attr->a_att_field, "inactive", 8))
		{
#if (defined WIN32 || defined _WIN32_WCE) 
		  _snprintf(tmp2, 199, "\r\na=inactive\r\n");
#else
		  snprintf(tmp2, 199, "\r\na=inactive\r\n");
#endif
		  inactive='0';
		  break;
		}
	    }
	  posattr++;
	}

      if (med->m_media!=NULL && med->m_proto!=NULL && med->m_number_of_port==NULL)
	{
#if (defined WIN32 || defined _WIN32_WCE) 
	_snprintf(tmp, 199, "m=%s %c %s ", med->m_media, inactive, med->m_proto);
#else
	snprintf(tmp, 199, "m=%s %c %s ", med->m_media, inactive, med->m_proto);
#endif
	}
      else if (med->m_media!=NULL && med->m_proto!=NULL && med->m_number_of_port==NULL)
	{
#if (defined WIN32 || defined _WIN32_WCE) 
	  _snprintf(tmp, 199, "m=%s %c %s/%s ", med->m_media, inactive, med->m_proto, med->m_number_of_port);
#else
	  snprintf(tmp, 199, "m=%s %c %s/%s ", med->m_media, inactive, med->m_proto, med->m_number_of_port);
#endif
	}
      else
	return -1;

      if ((int)(strlen(local_sdp)+strlen(tmp)+1)<length)
	strcat(local_sdp, tmp);
      else return -1;

      if ((int)(strlen(local_sdp)+strlen(tmp2)+1)<length)
	strcat(local_sdp, tmp2);
      else return -1;

      pos++;
    }

  return 0;
}

/**
 * Agree to support a specific codec.
 *   This method should be called for each codec returned by
 *   osip_rfc3264_match(...) that the calle agree to support.
 *
 * @param config The element to work on.
 * @param remote_sdp The remote SDP packet.
 * @param local_sdp The local SDP packet to complete.
 * @param med One of the media returned by osip_rfc3264_match.
 * @param mline The position of the media line to complete.
 */
int
osip_rfc3264_complete_answer(struct osip_rfc3264 *config,
			     sdp_message_t *remote_sdp,
			     sdp_message_t *local_sdp,
			     sdp_media_t *med,
			     int mline)
{
  osip_rfc3264_t *cnf = (osip_rfc3264_t*) config;
  sdp_media_t *remote_med = NULL;
  sdp_media_t *local_med = NULL;
  int pos;
  if (cnf==NULL) return -1;
  if (remote_sdp==NULL) return -1;
  if (med==NULL) return -1;
  if (mline<0) return -1;
  if (local_sdp==NULL) return -1;
  pos=0;
  while (!osip_list_eol(remote_sdp->m_medias, pos))
    {
      remote_med = (sdp_media_t *) osip_list_get(remote_sdp->m_medias, pos);
      local_med = (sdp_media_t *) osip_list_get(local_sdp->m_medias, pos);
      if (pos==mline) break;
      remote_med = NULL;
      local_med = NULL;
      pos++;
    }
  if (remote_med==NULL) return -1;

  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)
	{
	  sdp_attribute_t *mattr;
	  char *tmp;

	  /* fill the m= line */
	  tmp = (char*) osip_list_get(med->m_payloads, 0);
	  if (tmp!=NULL)
	    osip_list_add(local_med->m_payloads, osip_strdup(tmp), -1);
	  else
	    return -1;

	  sdp_attribute_init(&mattr);
	  mattr->a_att_field = osip_strdup(attr->a_att_field);
	  mattr->a_att_value = osip_strdup(attr->a_att_value);

	  /* fill the a= line */
	  osip_list_add (local_med->a_attributes, mattr, -1);
	  return 0;
	}
    }

  return -1; /* no rtpmap found? It is mandatory in audio and video media */
}

/**
 * Agree to support a specific codec.
 *   This method should be called for each codec returned by
 *   osip_rfc3264_match(...)
 *
 * @param config The element to work on.
 * @param med One of the media returned by osip_rfc3264_match
 * @param remote_sdp The remote SDP packet.
 * @param local_sdp The local SDP packet to prepare.
 */
int osip_rfc3264_accept_codec(struct osip_rfc3264 *config,
			      sdp_media_t *med,
			      sdp_message_t *remote_sdp,
			      sdp_message_t *local_sdp)
{
  if (config==NULL) return -1;

  return 0;
}


/* #ifdef RFC3264_DEBUG */

/**
 * List supported codecs. (for debugging purpose only)
 *
 * @param config The element to work on.
 */
int __osip_rfc3264_print_codecs(struct osip_rfc3264 *config)
{
  osip_rfc3264_t *cnf = (osip_rfc3264_t*) config;
  int i,pos;
  if (config==NULL) return -1;

  fprintf(stdout, "Audio codecs Supported:\n");
  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);
	  fprintf(stdout, "\tm=%s %s %s %s\n",
		  med->m_media,
		  med->m_port,
		  med->m_proto,
		  str);
	  pos = 0;
	  while (!osip_list_eol (med->a_attributes, pos))
	    {
	      sdp_attribute_t *attr =
		(sdp_attribute_t *) osip_list_get (med->a_attributes, pos);
	      fprintf(stdout, "\ta=%s:%s\n",
		      attr->a_att_field,
		      attr->a_att_value);
	      pos++;
	    }
	  fprintf(stdout, "\n");
	}
    }

  fprintf(stdout, "Video codecs Supported:\n");
  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);
	  fprintf(stdout, "\tm=%s %s %s %s\n",
		  med->m_media,
		  med->m_port,
		  med->m_proto,
		  str);
	  pos = 0;
	  while (!osip_list_eol (med->a_attributes, pos))
	    {
	      sdp_attribute_t *attr =
		(sdp_attribute_t *) osip_list_get (med->a_attributes, pos);
	      fprintf(stdout, "\ta=%s:%s\n",
		      attr->a_att_field,
		      attr->a_att_value);
	      pos++;
	    }
	  fprintf(stdout, "\n");
	}
    }

  fprintf(stdout, "t38 configs Supported:\n");
  for (i=0;i<MAX_T38_CODECS; i++)
    {
      if (cnf->t38_medias[i]!=NULL)
	{
	  sdp_media_t *med = cnf->t38_medias[i];
	  fprintf(stdout, "m=%s %s %s X\n",
		  med->m_media,
		  med->m_port,
		  med->m_proto);
	  pos = 0;
	  while (!osip_list_eol (med->a_attributes, pos))
	    {
	      sdp_attribute_t *attr =
		(sdp_attribute_t *) osip_list_get (med->a_attributes, pos);
	      fprintf(stdout, "\ta=%s:%s\n",
		      attr->a_att_field,
		      attr->a_att_value);
	      pos++;
	    }
	  fprintf(stdout, "\n");
	}
    }

  fprintf(stdout, "Application config Supported:\n");
  for (i=0;i<MAX_APP_CODECS; i++)
    {
      if (cnf->app_medias[i]!=NULL)
	{
	  sdp_media_t *med = cnf->app_medias[i];
	  fprintf(stdout, "m=%s %s %s X\n",
		  med->m_media,
		  med->m_port,
		  med->m_proto);
	  pos = 0;
	  while (!osip_list_eol (med->a_attributes, pos))
	    {
	      sdp_attribute_t *attr =
		(sdp_attribute_t *) osip_list_get (med->a_attributes, pos);
	      fprintf(stdout, "\ta=%s:%s\n",
		      attr->a_att_field,
		      attr->a_att_value);
	      pos++;
	    }
	  fprintf(stdout, "\n");
	}
    }

  return 0;
}

/* #endif */