session.c

一个开源的sip源代码

	    unsigned rpt;
	    pjmedia_sdp_attr *r_attr;
	    pjmedia_sdp_rtpmap r_rtpmap;

	    rpt = pj_strtoul(&rem_m->desc.fmt[i]);
	    if (rpt < 96)
		continue;

	    r_attr = pjmedia_sdp_media_find_attr(rem_m, &ID_RTPMAP,
						 &rem_m->desc.fmt[i]);
	    if (!r_attr)
		continue;

	    if (pjmedia_sdp_attr_get_rtpmap(r_attr, &r_rtpmap) != PJ_SUCCESS)
		continue;

	    if (!pj_stricmp(&rtpmap->enc_name, &r_rtpmap.enc_name) &&
		rtpmap->clock_rate == r_rtpmap.clock_rate)
	    {
		/* Found matched codec. */
		si->tx_pt = rpt;

		/* Get fmtp mode param in remote SDP, if any */
		get_fmtp_mode(rem_m, &rtpmap->pt, &rem_fmtp_mode);

		break;
	    }
	}

	if (si->tx_pt == 0xFFFF)
	    return PJMEDIA_EMISSINGRTPMAP;
    }

  
    /* Now that we have codec info, get the codec param. */
    si->param = PJ_POOL_ALLOC_T(pool, pjmedia_codec_param);
    status = pjmedia_codec_mgr_get_default_param(mgr, &si->fmt, si->param);
    if (status != PJ_SUCCESS)
	return status;

    /* Set fmtp mode for both local and remote */
    if (local_fmtp_mode != 0)
	si->param->setting.dec_fmtp_mode = (pj_int8_t)local_fmtp_mode;
    if (rem_fmtp_mode != 0)
	si->param->setting.enc_fmtp_mode = (pj_int8_t)rem_fmtp_mode;


    /* Get incomming payload type for telephone-events */
    si->rx_event_pt = -1;
    for (i=0; i<local_m->attr_count; ++i) {
	pjmedia_sdp_rtpmap r;

	attr = local_m->attr[i];
	if (pj_strcmp(&attr->name, &ID_RTPMAP) != 0)
	    continue;
	if (pjmedia_sdp_attr_get_rtpmap(attr, &r) != PJ_SUCCESS)
	    continue;
	if (pj_strcmp(&r.enc_name, &ID_TELEPHONE_EVENT) == 0) {
	    si->rx_event_pt = pj_strtoul(&r.pt);
	    break;
	}
    }

    /* Get outgoing payload type for telephone-events */
    si->tx_event_pt = -1;
    for (i=0; i<rem_m->attr_count; ++i) {
	pjmedia_sdp_rtpmap r;

	attr = rem_m->attr[i];
	if (pj_strcmp(&attr->name, &ID_RTPMAP) != 0)
	    continue;
	if (pjmedia_sdp_attr_get_rtpmap(attr, &r) != PJ_SUCCESS)
	    continue;
	if (pj_strcmp(&r.enc_name, &ID_TELEPHONE_EVENT) == 0) {
	    si->tx_event_pt = pj_strtoul(&r.pt);
	    break;
	}
    }

    /* Leave SSRC to random. */
    si->ssrc = pj_rand();

    /* Set default jitter buffer parameter. */
    si->jb_init = si->jb_max = si->jb_min_pre = si->jb_max_pre = -1;

    return PJ_SUCCESS;
}


/*
 * Initialize session info from SDP session descriptors.
 */
PJ_DEF(pj_status_t) 
pjmedia_session_info_from_sdp( pj_pool_t *pool,
			       pjmedia_endpt *endpt,
			       unsigned max_streams,
			       pjmedia_session_info *si,
			       const pjmedia_sdp_session *local,
			       const pjmedia_sdp_session *remote)
{
    unsigned i;

    PJ_ASSERT_RETURN(pool && endpt && si && local && remote, PJ_EINVAL);

    si->stream_cnt = max_streams;
    if (si->stream_cnt > local->media_count)
	si->stream_cnt = local->media_count;

    for (i=0; i<si->stream_cnt; ++i) {
	pj_status_t status;

	status = pjmedia_stream_info_from_sdp( &si->stream_info[i], pool,
					       endpt, 
					       local, remote, i);
	if (status != PJ_SUCCESS)
	    return status;

    }

    return PJ_SUCCESS;
}


/**
 * Create new session.
 */
PJ_DEF(pj_status_t) pjmedia_session_create( pjmedia_endpt *endpt, 
					    const pjmedia_session_info *si,
					    pjmedia_transport *transports[],
					    void *user_data,
					    pjmedia_session **p_session )
{
    pj_pool_t *pool;
    pjmedia_session *session;
    int i; /* Must be signed */
    pj_status_t status;

    /* Verify arguments. */
    PJ_ASSERT_RETURN(endpt && si && p_session, PJ_EINVAL);

    /* Create pool for the session. */
    pool = pjmedia_endpt_create_pool( endpt, "session", 
				      PJMEDIA_SESSION_SIZE, 
				      PJMEDIA_SESSION_INC);
    PJ_ASSERT_RETURN(pool != NULL, PJ_ENOMEM);

    session = PJ_POOL_ZALLOC_T(pool, pjmedia_session);
    session->pool = pool;
    session->endpt = endpt;
    session->stream_cnt = si->stream_cnt;
    session->user_data = user_data;

    /* Copy stream info (this simple memcpy may break sometime) */
    pj_memcpy(session->stream_info, si->stream_info,
	      si->stream_cnt * sizeof(pjmedia_stream_info));

    /*
     * Now create and start the stream!
     */
    for (i=0; i<(int)si->stream_cnt; ++i) {

	/* Create the stream */
	status = pjmedia_stream_create(endpt, session->pool,
				       &session->stream_info[i],
				       (transports?transports[i]:NULL),
				       session,
				       &session->stream[i]);
	if (status == PJ_SUCCESS)
	    status = pjmedia_stream_start(session->stream[i]);

	if (status != PJ_SUCCESS) {

	    for ( --i; i>=0; ++i) {
		pjmedia_stream_destroy(session->stream[i]);
	    }

	    pj_pool_release(session->pool);
	    return status;
	}
    }


    /* Done. */

    *p_session = session;
    return PJ_SUCCESS;
}


/*
 * Get session info.
 */
PJ_DEF(pj_status_t) pjmedia_session_get_info( pjmedia_session *session,
					      pjmedia_session_info *info )
{
    PJ_ASSERT_RETURN(session && info, PJ_EINVAL);

    info->stream_cnt = session->stream_cnt;
    pj_memcpy(info->stream_info, session->stream_info,
	      session->stream_cnt * sizeof(pjmedia_stream_info));

    return PJ_SUCCESS;
}


/**
 * Destroy media session.
 */
PJ_DEF(pj_status_t) pjmedia_session_destroy (pjmedia_session *session)
{
    unsigned i;

    PJ_ASSERT_RETURN(session, PJ_EINVAL);

    for (i=0; i<session->stream_cnt; ++i) {
	
	pjmedia_stream_destroy(session->stream[i]);

    }

    pj_pool_release (session->pool);

    return PJ_SUCCESS;
}


/**
 * Activate all stream in media session.
 *
 */
PJ_DEF(pj_status_t) pjmedia_session_resume(pjmedia_session *session,
					   pjmedia_dir dir)
{
    unsigned i;

    PJ_ASSERT_RETURN(session, PJ_EINVAL);

    for (i=0; i<session->stream_cnt; ++i) {
	pjmedia_session_resume_stream(session, i, dir);
    }

    return PJ_SUCCESS;
}


/**
 * Suspend receipt and transmission of all stream in media session.
 *
 */
PJ_DEF(pj_status_t) pjmedia_session_pause(pjmedia_session *session,
					  pjmedia_dir dir)
{
    unsigned i;

    PJ_ASSERT_RETURN(session, PJ_EINVAL);

    for (i=0; i<session->stream_cnt; ++i) {
	pjmedia_session_pause_stream(session, i, dir);
    }

    return PJ_SUCCESS;
}


/**
 * Suspend receipt and transmission of individual stream in media session.
 */
PJ_DEF(pj_status_t) pjmedia_session_pause_stream( pjmedia_session *session,
						  unsigned index,
						  pjmedia_dir dir)
{
    PJ_ASSERT_RETURN(session && index < session->stream_cnt, PJ_EINVAL);

    return pjmedia_stream_pause(session->stream[index], dir);
}


/**
 * Activate individual stream in media session.
 *
 */
PJ_DEF(pj_status_t) pjmedia_session_resume_stream( pjmedia_session *session,
						   unsigned index,
						   pjmedia_dir dir)
{
    PJ_ASSERT_RETURN(session && index < session->stream_cnt, PJ_EINVAL);

    return pjmedia_stream_resume(session->stream[index], dir);
}

/**
 * Enumerate media stream in the session.
 */
PJ_DEF(pj_status_t) pjmedia_session_enum_streams(const pjmedia_session *session,
						 unsigned *count, 
						 pjmedia_stream_info info[])
{
    unsigned i;

    PJ_ASSERT_RETURN(session && count && *count && info, PJ_EINVAL);

    if (*count > session->stream_cnt)
	*count = session->stream_cnt;

    for (i=0; i<*count; ++i) {
	pj_memcpy(&info[i], &session->stream[i], sizeof(pjmedia_stream_info));
    }

    return PJ_SUCCESS;
}


/*
 * Get the port interface.
 */
PJ_DEF(pj_status_t) pjmedia_session_get_port(  pjmedia_session *session,
					       unsigned index,
					       pjmedia_port **p_port)
{
    return pjmedia_stream_get_port( session->stream[index], p_port);
}

/*
 * Get statistics
 */
PJ_DEF(pj_status_t) pjmedia_session_get_stream_stat( pjmedia_session *session,
						     unsigned index,
						     pjmedia_rtcp_stat *stat)
{
    PJ_ASSERT_RETURN(session && stat && index < session->stream_cnt, 
		     PJ_EINVAL);

    return pjmedia_stream_get_stat(session->stream[index], stat);
}


/*
 * Dial DTMF digit to the stream, using RFC 2833 mechanism.
 */
PJ_DEF(pj_status_t) pjmedia_session_dial_dtmf( pjmedia_session *session,
					       unsigned index,
					       const pj_str_t *ascii_digits )
{
    PJ_ASSERT_RETURN(session && ascii_digits, PJ_EINVAL);
    return pjmedia_stream_dial_dtmf(session->stream[index], ascii_digits);
}

/*
 * Check if the specified stream has received DTMF digits.
 */
PJ_DEF(pj_status_t) pjmedia_session_check_dtmf( pjmedia_session *session,
					        unsigned index )
{
    PJ_ASSERT_RETURN(session, PJ_EINVAL);
    return pjmedia_stream_check_dtmf(session->stream[index]);
}


/*
 * Retrieve DTMF digits from the specified stream.
 */
PJ_DEF(pj_status_t) pjmedia_session_get_dtmf( pjmedia_session *session,
					      unsigned index,
					      char *ascii_digits,
					      unsigned *size )
{
    PJ_ASSERT_RETURN(session && ascii_digits && size, PJ_EINVAL);
    return pjmedia_stream_get_dtmf(session->stream[index], ascii_digits,
				   size);
}

/*
 * Install DTMF callback.
 */
PJ_DEF(pj_status_t)
pjmedia_session_set_dtmf_callback(pjmedia_session *session,
				  unsigned index,
				  void (*cb)(pjmedia_stream*, 
				 	     void *user_data, 
					     int digit), 
				  void *user_data)
{
    PJ_ASSERT_RETURN(session && index < session->stream_cnt, PJ_EINVAL);
    return pjmedia_stream_set_dtmf_callback(session->stream[index], cb,
					    user_data);
}