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pjproject/pjmedia/src/pjmedia/session.c

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/* $Id$ */
/*
* Copyright (C) 2003-2007 Benny Prijono <benny@prijono.org>
*
* This program 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.
*
* This program 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
*/
#include <pjmedia/session.h>
#include <pjmedia/errno.h>
#include <pj/log.h>
#include <pj/os.h>
#include <pj/pool.h>
#include <pj/string.h>
#include <pj/assert.h>
#include <pj/ctype.h>
#include <pj/rand.h>
struct pjmedia_session
{
pj_pool_t *pool;
pjmedia_endpt *endpt;
unsigned stream_cnt;
pjmedia_stream_info stream_info[PJMEDIA_MAX_SDP_MEDIA];
pjmedia_stream *stream[PJMEDIA_MAX_SDP_MEDIA];
void *user_data;
};
#define THIS_FILE "session.c"
#define PJMEDIA_SESSION_SIZE (48*1024)
#define PJMEDIA_SESSION_INC 1024
static const pj_str_t ID_AUDIO = { "audio", 5};
static const pj_str_t ID_VIDEO = { "video", 5};
static const pj_str_t ID_IN = { "IN", 2 };
static const pj_str_t ID_IP4 = { "IP4", 3};
static const pj_str_t ID_RTP_AVP = { "RTP/AVP", 7 };
static const pj_str_t ID_SDP_NAME = { "pjmedia", 7 };
static const pj_str_t ID_RTPMAP = { "rtpmap", 6 };
static const pj_str_t ID_TELEPHONE_EVENT = { "telephone-event", 15 };
static const pj_str_t STR_INACTIVE = { "inactive", 8 };
static const pj_str_t STR_SENDRECV = { "sendrecv", 8 };
static const pj_str_t STR_SENDONLY = { "sendonly", 8 };
static const pj_str_t STR_RECVONLY = { "recvonly", 8 };
/*
* Get fmtp mode parameter associated with the codec.
*/
static pj_status_t get_fmtp_mode(const pjmedia_sdp_media *m,
const pj_str_t *fmt,
int *p_mode)
{
const pjmedia_sdp_attr *attr;
pjmedia_sdp_fmtp fmtp;
const pj_str_t str_mode = { "mode=", 5 };
char *pos;
/* Get "fmtp" attribute for the format */
attr = pjmedia_sdp_media_find_attr2(m, "fmtp", fmt);
if (attr == NULL)
return -1;
/* Parse "fmtp" attribute */
if (pjmedia_sdp_attr_get_fmtp(attr, &fmtp) != PJ_SUCCESS)
return -1;
/* Look for "mode=" string in the fmtp */
while (fmtp.fmt_param.slen >= str_mode.slen + 1) {
if (pj_strnicmp(&fmtp.fmt_param, &str_mode, str_mode.slen)==0) {
/* Found "mode=" string */
break;
}
fmtp.fmt_param.ptr++;
fmtp.fmt_param.slen--;
}
if (fmtp.fmt_param.slen < str_mode.slen + 1) {
/* "mode=" param not found */
return -1;
}
/* Get the mode */
pos = fmtp.fmt_param.ptr + str_mode.slen;
*p_mode = 0;
while (pj_isdigit(*pos)) {
*p_mode = *p_mode * 10 + (*pos - '0');
++pos;
}
return PJ_SUCCESS;
}
/*
* Create stream info from SDP media line.
*/
PJ_DEF(pj_status_t) pjmedia_stream_info_from_sdp(
pjmedia_stream_info *si,
pj_pool_t *pool,
pjmedia_endpt *endpt,
const pjmedia_sdp_session *local,
const pjmedia_sdp_session *remote,
unsigned stream_idx)
{
pjmedia_codec_mgr *mgr;
const pjmedia_sdp_attr *attr;
const pjmedia_sdp_media *local_m;
const pjmedia_sdp_media *rem_m;
const pjmedia_sdp_conn *local_conn;
const pjmedia_sdp_conn *rem_conn;
pjmedia_sdp_rtpmap *rtpmap;
int local_fmtp_mode = 0, rem_fmtp_mode = 0;
unsigned i, pt, fmti;
pj_status_t status;
/* Validate arguments: */
PJ_ASSERT_RETURN(pool && si && local && remote, PJ_EINVAL);
PJ_ASSERT_RETURN(stream_idx < local->media_count, PJ_EINVAL);
PJ_ASSERT_RETURN(stream_idx < remote->media_count, PJ_EINVAL);
/* Get codec manager. */
mgr = pjmedia_endpt_get_codec_mgr(endpt);
/* Keep SDP shortcuts */
local_m = local->media[stream_idx];
rem_m = remote->media[stream_idx];
local_conn = local_m->conn ? local_m->conn : local->conn;
if (local_conn == NULL)
return PJMEDIA_SDP_EMISSINGCONN;
rem_conn = rem_m->conn ? rem_m->conn : remote->conn;
if (rem_conn == NULL)
return PJMEDIA_SDP_EMISSINGCONN;
/* Reset: */
pj_bzero(si, sizeof(*si));
/* Media type: */
if (pj_stricmp(&local_m->desc.media, &ID_AUDIO) == 0) {
si->type = PJMEDIA_TYPE_AUDIO;
} else if (pj_stricmp(&local_m->desc.media, &ID_VIDEO) == 0) {
si->type = PJMEDIA_TYPE_VIDEO;
} else {
si->type = PJMEDIA_TYPE_UNKNOWN;
return PJMEDIA_EINVALIMEDIATYPE;
}
/* Transport type must be equal */
if (pj_stricmp(&rem_m->desc.transport,
&local_m->desc.transport) != 0)
{
si->type = PJMEDIA_TYPE_UNKNOWN;
return PJMEDIA_SDPNEG_EINVANSTP;
}
/* Media direction: */
if (local_m->desc.port == 0 ||
pj_inet_addr(&local_conn->addr).s_addr==0 ||
pj_inet_addr(&rem_conn->addr).s_addr==0 ||
pjmedia_sdp_media_find_attr(local_m, &STR_INACTIVE, NULL)!=NULL)
{
/* Inactive stream. */
si->dir = PJMEDIA_DIR_NONE;
} else if (pjmedia_sdp_media_find_attr(local_m, &STR_SENDONLY, NULL)!=NULL) {
/* Send only stream. */
si->dir = PJMEDIA_DIR_ENCODING;
} else if (pjmedia_sdp_media_find_attr(local_m, &STR_RECVONLY, NULL)!=NULL) {
/* Recv only stream. */
si->dir = PJMEDIA_DIR_DECODING;
} else {
/* Send and receive stream. */
si->dir = PJMEDIA_DIR_ENCODING_DECODING;
}
/* Set remote address: */
status = pj_sockaddr_in_init(&si->rem_addr, &rem_conn->addr,
rem_m->desc.port);
if (status != PJ_SUCCESS) {
/* Invalid IP address. */
return PJMEDIA_EINVALIDIP;
}
/* If "rtcp" attribute is present in the SDP, set the RTCP address
* from that attribute. Otherwise, calculate from RTP address.
*/
attr = pjmedia_sdp_attr_find2(rem_m->attr_count, rem_m->attr,
"rtcp", NULL);
if (attr) {
pjmedia_sdp_rtcp_attr rtcp;
status = pjmedia_sdp_attr_get_rtcp(attr, &rtcp);
if (status == PJ_SUCCESS) {
if (rtcp.addr.slen) {
status = pj_sockaddr_in_init(&si->rem_rtcp, &rtcp.addr,
(pj_uint16_t)rtcp.port);
} else {
pj_sockaddr_in_init(&si->rem_rtcp, NULL,
(pj_uint16_t)rtcp.port);
si->rem_rtcp.sin_addr.s_addr = si->rem_addr.sin_addr.s_addr;
}
}
}
if (si->rem_rtcp.sin_addr.s_addr == 0) {
int rtcp_port;
pj_memcpy(&si->rem_rtcp, &si->rem_addr, sizeof(pj_sockaddr_in));
rtcp_port = pj_ntohs(si->rem_addr.sin_port) + 1;
si->rem_rtcp.sin_port = pj_htons((pj_uint16_t)rtcp_port);
}
/* Get the payload number for receive channel. */
/*
Previously we used to rely on fmt[0] being the selected codec,
but some UA sends telephone-event as fmt[0] and this would
cause assert failure below.
Thanks Chris Hamilton <chamilton .at. cs.dal.ca> for this patch.
// And codec must be numeric!
if (!pj_isdigit(*local_m->desc.fmt[0].ptr) ||
!pj_isdigit(*rem_m->desc.fmt[0].ptr))
{
return PJMEDIA_EINVALIDPT;
}
pt = pj_strtoul(&local_m->desc.fmt[0]);
pj_assert(PJMEDIA_RTP_PT_TELEPHONE_EVENTS==0 ||
pt != PJMEDIA_RTP_PT_TELEPHONE_EVENTS);
*/
/* This is to suppress MSVC warning about uninitialized var */
pt = 0;
/* Find the first codec which is not telephone-event */
for ( fmti = 0; fmti < local_m->desc.fmt_count; ++fmti ) {
if ( !pj_isdigit(*local_m->desc.fmt[fmti].ptr) )
return PJMEDIA_EINVALIDPT;
pt = pj_strtoul(&local_m->desc.fmt[fmti]);
if ( PJMEDIA_RTP_PT_TELEPHONE_EVENTS == 0 ||
pt != PJMEDIA_RTP_PT_TELEPHONE_EVENTS )
break;
}
if ( fmti >= local_m->desc.fmt_count )
return PJMEDIA_EINVALIDPT;
/* Get codec info.
* For static payload types, get the info from codec manager.
* For dynamic payload types, MUST get the rtpmap.
*/
if (pt < 96) {
pj_bool_t has_rtpmap;
rtpmap = NULL;
has_rtpmap = PJ_TRUE;
attr = pjmedia_sdp_media_find_attr(local_m, &ID_RTPMAP,
&local_m->desc.fmt[fmti]);
if (attr == NULL) {
has_rtpmap = PJ_FALSE;
}
if (attr != NULL) {
status = pjmedia_sdp_attr_to_rtpmap(pool, attr, &rtpmap);
if (status != PJ_SUCCESS)
has_rtpmap = PJ_FALSE;
}
/* Build codec format info: */
if (has_rtpmap) {
si->fmt.type = si->type;
si->fmt.pt = pj_strtoul(&local_m->desc.fmt[fmti]);
pj_strdup(pool, &si->fmt.encoding_name, &rtpmap->enc_name);
si->fmt.clock_rate = rtpmap->clock_rate;
/* For audio codecs, rtpmap parameters denotes the number of
* channels.
*/
if (si->type == PJMEDIA_TYPE_AUDIO && rtpmap->param.slen) {
if (rtpmap->param.slen == 2) {
si->fmt.channel_cnt = rtpmap->param.ptr[1] - '0';
} else {
pj_str_t cnt;
cnt.ptr = rtpmap->param.ptr + 1;
cnt.slen = rtpmap->param.slen - 1;
si->fmt.channel_cnt = (unsigned) pj_strtoul(&cnt);
}
} else {
si->fmt.channel_cnt = 1;
}
} else {
const pjmedia_codec_info *p_info;
status = pjmedia_codec_mgr_get_codec_info( mgr, pt, &p_info);
if (status != PJ_SUCCESS)
return status;
pj_memcpy(&si->fmt, p_info, sizeof(pjmedia_codec_info));
}
/* For static payload type, pt's are symetric */
si->tx_pt = pt;
} else {
attr = pjmedia_sdp_media_find_attr(local_m, &ID_RTPMAP,
&local_m->desc.fmt[fmti]);
if (attr == NULL)
return PJMEDIA_EMISSINGRTPMAP;
status = pjmedia_sdp_attr_to_rtpmap(pool, attr, &rtpmap);
if (status != PJ_SUCCESS)
return status;
/* Build codec format info: */
si->fmt.type = si->type;
si->fmt.pt = pj_strtoul(&local_m->desc.fmt[fmti]);
pj_strdup(pool, &si->fmt.encoding_name, &rtpmap->enc_name);
si->fmt.clock_rate = rtpmap->clock_rate;
/* For audio codecs, rtpmap parameters denotes the number of
* channels.
*/
if (si->type == PJMEDIA_TYPE_AUDIO && rtpmap->param.slen) {
if (rtpmap->param.slen == 2) {
si->fmt.channel_cnt = rtpmap->param.ptr[1] - '0';
} else {
pj_str_t cnt;
cnt.ptr = rtpmap->param.ptr + 1;
cnt.slen = rtpmap->param.slen - 1;
si->fmt.channel_cnt = (unsigned) pj_strtoul(&cnt);
}
} else {
si->fmt.channel_cnt = 1;
}
/* Get fmtp mode= param in local SDP, if any */
get_fmtp_mode(local_m, &local_m->desc.fmt[fmti], &local_fmtp_mode);
/* Determine payload type for outgoing channel, by finding
* dynamic payload type in remote SDP that matches the answer.
*/
si->tx_pt = 0xFFFF;
for (i=0; i<rem_m->desc.fmt_count; ++i) {
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);
}
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