static mrcp_engine_channel_t* mrcp_server_engine_channel_create(
mrcp_server_session_t *session,
mrcp_channel_t *channel,
const apt_str_t *resource_name)
{
mrcp_engine_t *engine = apr_hash_get(
session->profile->engine_table,
resource_name->buf,
resource_name->length);
if(!engine) {
apt_log(APT_LOG_MARK,APT_PRIO_WARNING,"Failed to Find MRCP Engine "APT_NAMESID_FMT" [%s]",
MRCP_SESSION_NAMESID(session),
resource_name->buf);
return NULL;
}
channel->state_machine = engine->create_state_machine(
channel,
mrcp_session_version_get(session),
channel->pool);
if(channel->state_machine) {
channel->state_machine->on_dispatch = state_machine_on_message_dispatch;
channel->state_machine->on_deactivate = state_machine_on_deactivate;
}
return mrcp_engine_channel_virtual_create(engine,mrcp_session_version_get(session),session->base.pool);
}
static apt_bool_t mrcp_client_resource_discover(mrcp_client_session_t *session)
{
mrcp_session_descriptor_t *descriptor = NULL;
apt_log(APT_LOG_MARK,APT_PRIO_INFO,"Discover Resources "APT_PTR_FMT, MRCP_SESSION_PTR(&session->base));
session->answer = NULL;
mrcp_client_session_state_set(session,SESSION_STATE_DISCOVERING);
if(mrcp_session_version_get(session) == MRCP_VERSION_1) {
mrcp_resource_t *resource;
mrcp_resource_id i;
for(i=0; i<MRCP_RESOURCE_TYPE_COUNT; i++) {
resource = mrcp_resource_get(session->profile->resource_factory,i);
if(!resource) continue;
descriptor = mrcp_session_descriptor_create(session->base.pool);
apt_string_copy(&descriptor->resource_name,&resource->name,session->base.pool);
if(mrcp_session_discover_request(&session->base,descriptor) == TRUE) {
mrcp_client_session_subrequest_add(session);
}
}
}
else {
if(mrcp_session_discover_request(&session->base,descriptor) == TRUE) {
mrcp_client_session_subrequest_add(session);
}
}
if(session->subrequest_count == 0) {
session->status = MRCP_SIG_STATUS_CODE_FAILURE;
mrcp_app_sig_response_raise(session,TRUE);
}
return TRUE;
}
static apt_bool_t mrcp_server_session_offer_process(mrcp_server_session_t *session, mrcp_session_descriptor_t *descriptor)
{
if(!session->context) {
/* initial offer received, generate session id and add to session's table */
if(!session->base.id.length) {
apt_unique_id_generate(&session->base.id,MRCP_SESSION_ID_HEX_STRING_LENGTH,session->base.pool);
}
mrcp_server_session_add(session);
session->context = mpf_engine_context_create(session->profile->media_engine,session,5,session->base.pool);
}
apt_log(APT_LOG_MARK,APT_PRIO_INFO,"Receive Offer "APT_SID_FMT" [c:%d a:%d v:%d]",
MRCP_SESSION_SID(&session->base),
descriptor->control_media_arr->nelts,
descriptor->audio_media_arr->nelts,
descriptor->video_media_arr->nelts);
/* store received offer */
session->offer = descriptor;
session->answer = mrcp_session_answer_create(descriptor,session->base.pool);
mrcp_server_session_state_set(session,SESSION_STATE_GENERATING_ANSWER);
/* first, reset/destroy existing associations and topology */
if(mpf_engine_topology_message_add(
session->profile->media_engine,
MPF_RESET_ASSOCIATIONS,session->context,
&session->mpf_task_msg) == TRUE){
mrcp_server_session_subrequest_add(session);
}
if(mrcp_session_version_get(session) == MRCP_VERSION_1) {
if(mrcp_server_resource_offer_process(session,descriptor) == TRUE) {
mrcp_server_av_media_offer_process(session,descriptor);
}
else {
session->answer->resource_state = FALSE;
}
}
else {
mrcp_server_control_media_offer_process(session,descriptor);
mrcp_server_av_media_offer_process(session,descriptor);
}
/* apply topology based on assigned associations */
if(mpf_engine_topology_message_add(
session->profile->media_engine,
MPF_APPLY_TOPOLOGY,session->context,
&session->mpf_task_msg) == TRUE) {
mrcp_server_session_subrequest_add(session);
}
mpf_engine_message_send(session->profile->media_engine,&session->mpf_task_msg);
if(!session->subrequest_count) {
/* send answer to client */
mrcp_server_session_answer_send(session);
}
return TRUE;
}
static mrcp_channel_t* mrcp_server_channel_create(mrcp_server_session_t *session, const apt_str_t *resource_name, apr_size_t id, apr_array_header_t *cmid_arr)
{
mrcp_channel_t *channel;
apr_pool_t *pool = session->base.pool;
channel = apr_palloc(pool,sizeof(mrcp_channel_t));
channel->pool = pool;
channel->session = &session->base;
channel->resource = NULL;
channel->control_channel = NULL;
channel->state_machine = NULL;
channel->engine_channel = NULL;
channel->id = id;
channel->cmid_arr = cmid_arr;
channel->waiting_for_channel = FALSE;
channel->waiting_for_termination = FALSE;
if(resource_name && resource_name->buf) {
mrcp_resource_t *resource;
mrcp_engine_channel_t *engine_channel;
resource = mrcp_resource_find(session->profile->resource_factory,resource_name);
if(resource) {
channel->resource = resource;
if(mrcp_session_version_get(session) == MRCP_VERSION_2) {
channel->control_channel = mrcp_server_control_channel_create(
session->profile->connection_agent,
channel,
pool);
}
engine_channel = mrcp_server_engine_channel_create(session,channel,resource_name);
if(engine_channel) {
engine_channel->id = session->base.id;
engine_channel->event_obj = channel;
engine_channel->event_vtable = &engine_channel_vtable;
channel->engine_channel = engine_channel;
}
else {
apt_log(APT_LOG_MARK,APT_PRIO_WARNING,"Failed to Create Engine Channel "APT_NAMESID_FMT" [%s]",
MRCP_SESSION_NAMESID(session),
resource_name->buf);
session->answer->status = MRCP_SESSION_STATUS_UNACCEPTABLE_RESOURCE;
}
}
else {
apt_log(APT_LOG_MARK,APT_PRIO_WARNING,"No Such Resource "APT_NAMESID_FMT" [%s]",
MRCP_SESSION_NAMESID(session),
resource_name->buf);
session->answer->status = MRCP_SESSION_STATUS_NO_SUCH_RESOURCE;
}
}
else {
apt_log(APT_LOG_MARK,APT_PRIO_WARNING,"Invalid Resource Identifier "APT_NAMESID_FMT,
MRCP_SESSION_NAMESID(session));
session->answer->status = MRCP_SESSION_STATUS_NO_SUCH_RESOURCE;
}
return channel;
}
static mrcp_engine_channel_t* mrcp_server_engine_channel_create(mrcp_server_session_t *session, const apt_str_t *resource_name)
{
mrcp_engine_t *engine = apr_hash_get(
session->profile->engine_table,
resource_name->buf,
resource_name->length);
if(!engine) {
apt_log(APT_LOG_MARK,APT_PRIO_WARNING,"Failed to Find MRCP Engine [%s]",resource_name->buf);
return NULL;
}
return mrcp_engine_channel_virtual_create(engine,mrcp_session_version_get(session),session->base.pool);
}
static apt_bool_t mrcp_server_engine_channels_update(mrcp_server_session_t *session)
{
mrcp_channel_t *channel;
mrcp_session_descriptor_t *descriptor = session->offer;
if(!descriptor) {
return FALSE;
}
mrcp_server_session_state_set(session,SESSION_STATE_INITIALIZING);
if(mrcp_session_version_get(session) == MRCP_VERSION_1) {
if(session->offer) {
channel = mrcp_server_channel_find(session,&descriptor->resource_name);
if(channel && channel->engine_channel) {
/* open engine channel */
if(mrcp_engine_channel_virtual_open(channel->engine_channel) == TRUE) {
mrcp_server_session_subrequest_add(session);
}
}
}
}
else {
int i;
mrcp_control_descriptor_t *control_descriptor;
for(i=0; i<session->channels->nelts; i++) {
channel = APR_ARRAY_IDX(session->channels,i,mrcp_channel_t*);
if(!channel || !channel->engine_channel) continue;
control_descriptor = mrcp_session_control_media_get(descriptor,i);
if(!control_descriptor) continue;
if(control_descriptor->port) {
/* open engine channel */
if(mrcp_engine_channel_virtual_open(channel->engine_channel) == TRUE) {
mrcp_server_session_subrequest_add(session);
}
}
else {
/* close engine channel */
if(mrcp_engine_channel_virtual_close(channel->engine_channel) == TRUE) {
mrcp_server_session_subrequest_add(session);
}
}
}
}
if(!session->subrequest_count) {
mrcp_server_session_answer_send(session);
}
return TRUE;
}
apt_bool_t mrcp_client_session_discover_response_process(mrcp_client_session_t *session, mrcp_session_descriptor_t *descriptor)
{
apt_log(APT_LOG_MARK,APT_PRIO_INFO,"Resources Discovered %s", session->base.name);
if(!session->active_request) {
return FALSE;
}
if(!descriptor) {
/* raise app response */
session->status = MRCP_SIG_STATUS_CODE_FAILURE;
return mrcp_app_sig_response_raise(session,TRUE);
}
if(mrcp_session_version_get(session) == MRCP_VERSION_1) {
if(descriptor->resource_state == TRUE) {
mrcp_control_descriptor_t *control_media;
if(!session->answer) {
session->answer = descriptor;
}
control_media = mrcp_control_descriptor_create(session->base.pool);
control_media->id = mrcp_session_control_media_add(session->answer,control_media);
control_media->resource_name = descriptor->resource_name;
}
}
else {
session->answer = descriptor;
}
if(mrcp_client_session_subrequest_remove(session) == TRUE) {
mrcp_app_message_t *response;
response = mrcp_client_app_response_create(session->active_request,MRCP_SIG_STATUS_CODE_SUCCESS,session->base.pool);
response->descriptor = session->answer;
session->answer = NULL;
apt_log(APT_LOG_MARK,APT_PRIO_INFO,"Raise App Resource Discovery Response %s", session->base.name);
session->application->handler(response);
session->active_request = apt_list_pop_front(session->request_queue);
if(session->active_request) {
mrcp_app_request_dispatch(session,session->active_request);
}
}
return TRUE;
}
static apt_bool_t mrcp_client_channel_add(mrcp_client_session_t *session, mrcp_channel_t *channel)
{
mpf_rtp_termination_descriptor_t *rtp_descriptor = NULL;
rtp_termination_slot_t *slot;
apr_pool_t *pool = session->base.pool;
mrcp_profile_t *profile = session->profile;
if(mrcp_client_channel_find(session,channel,NULL) == TRUE) {
/* update */
return mrcp_client_channel_modify(session,channel,TRUE);
}
if(!session->offer) {
session->offer = mrcp_session_descriptor_create(pool);
}
mrcp_client_session_state_set(session,SESSION_STATE_GENERATING_OFFER);
if(mrcp_session_version_get(session) == MRCP_VERSION_1) {
session->offer->resource_name = channel->resource->name;
session->offer->resource_state = TRUE;
}
else {
mrcp_control_descriptor_t *control_media;
if(!channel->control_channel) {
channel->control_channel = mrcp_client_control_channel_create(profile->connection_agent,channel,pool);
mrcp_client_control_channel_log_obj_set(channel->control_channel,session->base.log_obj);
}
control_media = mrcp_control_offer_create(pool);
control_media->id = mrcp_session_control_media_add(session->offer,control_media);
mrcp_cmid_add(control_media->cmid_arr,session->offer->control_media_arr->nelts);
control_media->resource_name = channel->resource->name;
if(mrcp_client_control_channel_add(channel->control_channel,control_media) == TRUE) {
channel->waiting_for_channel = TRUE;
mrcp_client_session_subrequest_add(session);
}
}
apt_obj_log(APT_LOG_MARK,APT_PRIO_NOTICE,session->base.log_obj,"Add Control Channel "APT_NAMESIDRES_FMT,
MRCP_SESSION_NAMESID(session),
channel->resource->name.buf);
/* add control channel */
APR_ARRAY_PUSH(session->channels,mrcp_channel_t*) = channel;
/* add rtp termination slot */
slot = apr_array_push(session->terminations);
slot->waiting = FALSE;
slot->termination = NULL;
slot->descriptor = NULL;
slot->channel = channel;
slot->id = 0;
if(channel->termination) {
/* media termination mode */
mpf_termination_t *termination;
mpf_audio_stream_t *audio_stream;
if(!session->context) {
/* create media context first */
session->context = mpf_engine_context_create(
profile->media_engine,
session->base.name,
session,5,pool);
}
apt_obj_log(APT_LOG_MARK,APT_PRIO_DEBUG,session->base.log_obj,"Add Media Termination "APT_NAMESIDRES_FMT,
MRCP_SESSION_NAMESID(session),
mpf_termination_name_get(channel->termination));
if(mpf_engine_termination_message_add(
profile->media_engine,
MPF_ADD_TERMINATION,session->context,channel->termination,NULL,
&session->mpf_task_msg) == TRUE) {
channel->waiting_for_termination = TRUE;
mrcp_client_session_subrequest_add(session);
}
/* initialize rtp descriptor */
rtp_descriptor = apr_palloc(pool,sizeof(mpf_rtp_termination_descriptor_t));
mpf_rtp_termination_descriptor_init(rtp_descriptor);
rtp_descriptor->audio.settings = profile->rtp_settings;
audio_stream = mpf_termination_audio_stream_get(channel->termination);
if(audio_stream) {
mpf_rtp_media_descriptor_t *media;
media = apr_palloc(pool,sizeof(mpf_rtp_media_descriptor_t));
mpf_rtp_media_descriptor_init(media);
media->state = MPF_MEDIA_ENABLED;
media->direction = mpf_stream_reverse_direction_get(audio_stream->direction);
rtp_descriptor->audio.local = media;
if(audio_stream->capabilities) {
rtp_descriptor->audio.capabilities = mpf_stream_capabilities_clone(audio_stream->capabilities,pool);
rtp_descriptor->audio.capabilities->direction = media->direction;
}
}
/* create rtp termination */
termination = mpf_termination_create(profile->rtp_termination_factory,session,pool);
slot->termination = termination;
apt_obj_log(APT_LOG_MARK,APT_PRIO_DEBUG,session->base.log_obj,"Add Media Termination "APT_NAMESIDRES_FMT,
MRCP_SESSION_NAMESID(session),
mpf_termination_name_get(termination));
/* send add termination request (add to media context) */
if(mpf_engine_termination_message_add(
profile->media_engine,
MPF_ADD_TERMINATION,session->context,termination,rtp_descriptor,
&session->mpf_task_msg) == TRUE) {
slot->waiting = TRUE;
mrcp_client_session_subrequest_add(session);
}
mpf_engine_message_send(profile->media_engine,&session->mpf_task_msg);
}
else {
/* bypass media mode */
if(channel->rtp_termination_slot) {
rtp_descriptor = channel->rtp_termination_slot->descriptor;
if(rtp_descriptor) {
if(rtp_descriptor->audio.local) {
session->offer->ip = rtp_descriptor->audio.local->ip;
session->offer->ext_ip = rtp_descriptor->audio.local->ext_ip;
rtp_descriptor->audio.local->id = mrcp_session_audio_media_add(session->offer,rtp_descriptor->audio.local);
rtp_descriptor->audio.local->mid = session->offer->audio_media_arr->nelts;
slot->id = session->offer->audio_media_arr->nelts - 1;
}
}
}
}
slot->descriptor = rtp_descriptor;
channel->rtp_termination_slot = slot;
if(!session->subrequest_count) {
/* send offer to server */
mrcp_client_session_offer_send(session);
}
return TRUE;
}
apt_bool_t mrcp_client_session_answer_process(mrcp_client_session_t *session, mrcp_session_descriptor_t *descriptor)
{
if(!session->offer) {
return FALSE;
}
if(!descriptor) {
apt_obj_log(APT_LOG_MARK,APT_PRIO_INFO,session->base.log_obj,"Receive Answer "APT_NAMESID_FMT" [null descriptor]",
MRCP_SESSION_NAMESID(session));
session->status = MRCP_SIG_STATUS_CODE_FAILURE;
/* raise app response */
return mrcp_app_sig_response_raise(session,TRUE);
}
apt_obj_log(APT_LOG_MARK,APT_PRIO_INFO,session->base.log_obj,"Receive Answer "APT_NAMESID_FMT" [c:%d a:%d v:%d] Status %d",
MRCP_SESSION_NAMESID(session),
descriptor->control_media_arr->nelts,
descriptor->audio_media_arr->nelts,
descriptor->video_media_arr->nelts,
descriptor->response_code);
if(descriptor->response_code >=200 && descriptor->response_code < 300) {
mrcp_client_session_state_set(session,SESSION_STATE_PROCESSING_ANSWER);
if(session->context) {
/* first, reset/destroy existing associations and topology */
if(mpf_engine_topology_message_add(
session->profile->media_engine,
MPF_RESET_ASSOCIATIONS,session->context,
&session->mpf_task_msg) == TRUE){
mrcp_client_session_subrequest_add(session);
}
}
if(mrcp_session_version_get(session) == MRCP_VERSION_1) {
if(mrcp_client_resource_answer_process(session,descriptor) != TRUE) {
session->status = MRCP_SIG_STATUS_CODE_FAILURE;
}
}
else {
mrcp_client_control_media_answer_process(session,descriptor);
mrcp_client_av_media_answer_process(session,descriptor);
}
if(session->context) {
/* apply topology based on assigned associations */
if(mpf_engine_topology_message_add(
session->profile->media_engine,
MPF_APPLY_TOPOLOGY,session->context,
&session->mpf_task_msg) == TRUE) {
mrcp_client_session_subrequest_add(session);
}
mpf_engine_message_send(session->profile->media_engine,&session->mpf_task_msg);
}
}
else {
session->status = MRCP_SIG_STATUS_CODE_TERMINATE;
}
/* store received answer */
session->answer = descriptor;
if(!session->subrequest_count) {
/* raise app response */
mrcp_app_sig_response_raise(session,TRUE);
}
return TRUE;
}