/** Create ASR session */
ASR_CLIENT_DECLARE(asr_session_t*) asr_session_create(asr_engine_t *engine, const char *profile)
{
mpf_termination_t *termination;
mrcp_channel_t *channel;
mrcp_session_t *session;
const mrcp_app_message_t *app_message;
apr_pool_t *pool;
asr_session_t *asr_session;
mpf_stream_capabilities_t *capabilities;
/* create session */
session = mrcp_application_session_create(engine->mrcp_app,profile,NULL);
if(!session) {
return NULL;
}
pool = mrcp_application_session_pool_get(session);
asr_session = apr_palloc(pool,sizeof(asr_session_t));
mrcp_application_session_object_set(session,asr_session);
/* create source stream capabilities */
capabilities = mpf_source_stream_capabilities_create(pool);
/* add codec capabilities (Linear PCM) */
mpf_codec_capabilities_add(
&capabilities->codecs,
MPF_SAMPLE_RATE_8000,
"LPCM");
termination = mrcp_application_audio_termination_create(
session, /* session, termination belongs to */
&audio_stream_vtable, /* virtual methods table of audio stream */
capabilities, /* capabilities of audio stream */
asr_session); /* object to associate */
channel = mrcp_application_channel_create(
session, /* session, channel belongs to */
MRCP_RECOGNIZER_RESOURCE, /* MRCP resource identifier */
termination, /* media termination, used to terminate audio stream */
NULL, /* RTP descriptor, used to create RTP termination (NULL by default) */
asr_session); /* object to associate */
if(!channel) {
mrcp_application_session_destroy(session);
return NULL;
}
asr_session->engine = engine;
asr_session->mrcp_session = session;
asr_session->mrcp_channel = channel;
asr_session->recog_complete = NULL;
asr_session->input_mode = INPUT_MODE_NONE;
asr_session->streaming = FALSE;
asr_session->audio_in = NULL;
asr_session->media_buffer = NULL;
asr_session->mutex = NULL;
asr_session->wait_object = NULL;
asr_session->app_message = NULL;
/* Create cond wait object and mutex */
apr_thread_mutex_create(&asr_session->mutex,APR_THREAD_MUTEX_DEFAULT,pool);
apr_thread_cond_create(&asr_session->wait_object,pool);
/* Create media buffer */
asr_session->media_buffer = mpf_frame_buffer_create(160,20,pool);
/* Send add channel request and wait for the response */
apr_thread_mutex_lock(asr_session->mutex);
app_message = NULL;
if(mrcp_application_channel_add(asr_session->mrcp_session,asr_session->mrcp_channel) == TRUE) {
apr_thread_cond_wait(asr_session->wait_object,asr_session->mutex);
app_message = asr_session->app_message;
asr_session->app_message = NULL;
}
apr_thread_mutex_unlock(asr_session->mutex);
if(sig_response_check(app_message) == FALSE) {
asr_session_destroy_ex(asr_session,TRUE);
return NULL;
}
return asr_session;
}
/** \brief Set up the speech structure within the engine */
static int uni_recog_create_internal(struct ast_speech *speech, ast_format_compat *format)
{
uni_speech_t *uni_speech;
mrcp_session_t *session;
apr_pool_t *pool;
const mpf_codec_descriptor_t *descriptor;
/* Create session instance */
session = mrcp_application_session_create(uni_engine.application,uni_engine.profile,speech);
if(!session) {
ast_log(LOG_ERROR, "Failed to create session\n");
return -1;
}
pool = mrcp_application_session_pool_get(session);
uni_speech = apr_palloc(pool,sizeof(uni_speech_t));
uni_speech->session = session;
uni_speech->channel = NULL;
uni_speech->wait_object = NULL;
uni_speech->mutex = NULL;
uni_speech->media_buffer = NULL;
uni_speech->active_grammars = apr_hash_make(pool);
uni_speech->is_sm_request = FALSE;
uni_speech->is_inprogress = FALSE;
uni_speech->sm_request = 0;
uni_speech->sm_response = MRCP_SIG_STATUS_CODE_SUCCESS;
uni_speech->mrcp_request = NULL;
uni_speech->mrcp_response = NULL;
uni_speech->mrcp_event = NULL;
uni_speech->speech_base = speech;
speech->data = uni_speech;
/* Create cond wait object and mutex */
apr_thread_mutex_create(&uni_speech->mutex,APR_THREAD_MUTEX_DEFAULT,pool);
apr_thread_cond_create(&uni_speech->wait_object,pool);
/* Create recognition channel instance */
if(uni_recog_channel_create(uni_speech,format) != TRUE) {
ast_log(LOG_ERROR, "Failed to create channel\n");
uni_recog_cleanup(uni_speech);
return -1;
}
/* Send add channel request and wait for response */
if(uni_recog_sm_request_send(uni_speech,MRCP_SIG_COMMAND_CHANNEL_ADD) != TRUE) {
ast_log(LOG_WARNING, "Failed to send add channel request\n");
uni_recog_cleanup(uni_speech);
return -1;
}
/* Check received response */
if(uni_speech->sm_response != MRCP_SIG_STATUS_CODE_SUCCESS) {
ast_log(LOG_WARNING, "Failed to add channel\n");
uni_recog_sm_request_send(uni_speech,MRCP_SIG_COMMAND_SESSION_TERMINATE);
uni_recog_cleanup(uni_speech);
return -1;
}
descriptor = mrcp_application_source_descriptor_get(uni_speech->channel);
if(descriptor) {
mpf_frame_buffer_t *media_buffer;
apr_size_t frame_size = mpf_codec_linear_frame_size_calculate(descriptor->sampling_rate,descriptor->channel_count);
/* Create media buffer */
ast_log(LOG_DEBUG, "Create media buffer frame_size:%"APR_SIZE_T_FMT"\n",frame_size);
media_buffer = mpf_frame_buffer_create(frame_size,20,pool);
uni_speech->media_buffer = media_buffer;
}
if(!uni_speech->media_buffer) {
ast_log(LOG_WARNING, "Failed to create media buffer\n");
uni_recog_sm_request_send(uni_speech,MRCP_SIG_COMMAND_SESSION_TERMINATE);
uni_recog_cleanup(uni_speech);
return -1;
}
ast_log(LOG_NOTICE, "Created speech instance '%s'\n",uni_speech_id_get(uni_speech));
/* Set properties for session */
uni_recog_properties_set(uni_speech);
/* Preload grammars */
uni_recog_grammars_preload(uni_speech);
return 0;
}
