/** Initiate recognition based on specified grammar and input stream */
ASR_CLIENT_DECLARE(apt_bool_t) asr_session_stream_recognize(
asr_session_t *asr_session,
const char *grammar_file)
{
const mrcp_app_message_t *app_message;
mrcp_message_t *mrcp_message;
app_message = NULL;
mrcp_message = define_grammar_message_create(asr_session,grammar_file);
if(!mrcp_message) {
apt_log(APT_LOG_MARK,APT_PRIO_WARNING,"Failed to Create DEFINE-GRAMMAR Request");
return FALSE;
}
/* Send DEFINE-GRAMMAR request and wait for the response */
apr_thread_mutex_lock(asr_session->mutex);
if(mrcp_application_message_send(asr_session->mrcp_session,asr_session->mrcp_channel,mrcp_message) == 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(mrcp_response_check(app_message,MRCP_REQUEST_STATE_COMPLETE) == FALSE) {
return FALSE;
}
/* Reset prev recog result (if any) */
asr_session->recog_complete = NULL;
app_message = NULL;
mrcp_message = recognize_message_create(asr_session);
if(!mrcp_message) {
apt_log(APT_LOG_MARK,APT_PRIO_WARNING,"Failed to Create RECOGNIZE Request");
return FALSE;
}
/* Send RECOGNIZE request and wait for the response */
apr_thread_mutex_lock(asr_session->mutex);
if(mrcp_application_message_send(asr_session->mrcp_session,asr_session->mrcp_channel,mrcp_message) == 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(mrcp_response_check(app_message,MRCP_REQUEST_STATE_INPROGRESS) == FALSE) {
return FALSE;
}
/* Reset media buffer */
mpf_frame_buffer_restart(asr_session->media_buffer);
/* Set input mode and start streaming */
asr_session->input_mode = INPUT_MODE_STREAM;
asr_session->streaming = TRUE;
return TRUE;
}
/*! \brief Stop the in-progress recognition */
static int uni_recog_stop(struct ast_speech *speech)
{
uni_speech_t *uni_speech = speech->data;
mrcp_message_t *mrcp_message;
if(!uni_speech->is_inprogress) {
return 0;
}
ast_log(LOG_NOTICE, "Stop recognition '%s'\n",uni_speech_id_get(uni_speech));
mrcp_message = mrcp_application_message_create(
uni_speech->session,
uni_speech->channel,
RECOGNIZER_STOP);
if(!mrcp_message) {
ast_log(LOG_WARNING, "Failed to create MRCP message\n");
return -1;
}
/* Reset last event (if any) */
uni_speech->mrcp_event = NULL;
/* Send MRCP request and wait for response */
if(uni_recog_mrcp_request_send(uni_speech,mrcp_message) != TRUE) {
ast_log(LOG_WARNING, "Failed to send MRCP message\n");
return -1;
}
/* Check received response */
if(!uni_speech->mrcp_response || uni_speech->mrcp_response->start_line.status_code != MRCP_STATUS_CODE_SUCCESS) {
ast_log(LOG_WARNING, "Received failure response\n");
return -1;
}
/* Reset media buffer */
mpf_frame_buffer_restart(uni_speech->media_buffer);
ast_speech_change_state(speech, AST_SPEECH_STATE_NOT_READY);
uni_speech->is_inprogress = FALSE;
return 0;
}
/*! \brief Stop the in-progress recognition */
static int uni_recog_stop(struct ast_speech *speech)
{
uni_speech_t *uni_speech = speech->data;
mrcp_message_t *mrcp_message;
if(!uni_speech->is_inprogress) {
return 0;
}
ast_log(LOG_NOTICE, "(%s) Stop recognition\n",uni_speech->name);
mrcp_message = mrcp_application_message_create(
uni_speech->session,
uni_speech->channel,
RECOGNIZER_STOP);
if(!mrcp_message) {
ast_log(LOG_WARNING, "(%s) Failed to create MRCP message\n",uni_speech->name);
return -1;
}
/* Reset last event (if any) */
uni_speech->mrcp_event = NULL;
/* Send MRCP request and wait for response */
if(uni_recog_mrcp_request_send(uni_speech,mrcp_message) != TRUE) {
ast_log(LOG_WARNING, "(%s) Failed to stop recognition\n",uni_speech->name);
return -1;
}
/* Reset media buffer */
mpf_frame_buffer_restart(uni_speech->media_buffer);
ast_speech_change_state(speech, AST_SPEECH_STATE_NOT_READY);
uni_speech->is_inprogress = FALSE;
return 0;
}
/** Initiate recognition based on specified grammar and input stream */
ASR_CLIENT_DECLARE(const char*) asr_session_stream_recognize(
asr_session_t *asr_session,
const char *grammar_file)
{
const mrcp_app_message_t *app_message;
mrcp_message_t *mrcp_message;
app_message = NULL;
mrcp_message = define_grammar_message_create(asr_session,grammar_file);
if(!mrcp_message) {
apt_log(APT_LOG_MARK,APT_PRIO_WARNING,"Failed to Create DEFINE-GRAMMAR Request");
return NULL;
}
/* Send DEFINE-GRAMMAR request and wait for the response */
apr_thread_mutex_lock(asr_session->mutex);
if(mrcp_application_message_send(asr_session->mrcp_session,asr_session->mrcp_channel,mrcp_message) == 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(mrcp_response_check(app_message,MRCP_REQUEST_STATE_COMPLETE) == FALSE) {
return NULL;
}
/* Reset prev recog result (if any) */
asr_session->recog_complete = NULL;
app_message = NULL;
mrcp_message = recognize_message_create(asr_session);
if(!mrcp_message) {
apt_log(APT_LOG_MARK,APT_PRIO_WARNING,"Failed to Create RECOGNIZE Request");
return NULL;
}
/* Send RECOGNIZE request and wait for the response */
apr_thread_mutex_lock(asr_session->mutex);
if(mrcp_application_message_send(asr_session->mrcp_session,asr_session->mrcp_channel,mrcp_message) == 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(mrcp_response_check(app_message,MRCP_REQUEST_STATE_INPROGRESS) == FALSE) {
return NULL;
}
/* Reset media buffer */
mpf_frame_buffer_restart(asr_session->media_buffer);
/* Set input mode and start streaming */
asr_session->input_mode = INPUT_MODE_STREAM;
asr_session->streaming = TRUE;
/* Wait for events either START-OF-INPUT or RECOGNITION-COMPLETE */
do {
apr_thread_mutex_lock(asr_session->mutex);
app_message = NULL;
if(apr_thread_cond_timedwait(asr_session->wait_object,asr_session->mutex, 60 * 1000000) != APR_SUCCESS) {
apr_thread_mutex_unlock(asr_session->mutex);
return NULL;
}
app_message = asr_session->app_message;
asr_session->app_message = NULL;
apr_thread_mutex_unlock(asr_session->mutex);
mrcp_message = mrcp_event_get(app_message);
if(mrcp_message && mrcp_message->start_line.method_id == RECOGNIZER_RECOGNITION_COMPLETE) {
asr_session->recog_complete = mrcp_message;
}
}
while(!asr_session->recog_complete);
/* Get results */
return nlsml_input_get(asr_session->recog_complete);
}
/** brief Prepare engine to accept audio */
static int uni_recog_start(struct ast_speech *speech)
{
uni_speech_t *uni_speech = speech->data;
mrcp_message_t *mrcp_message;
mrcp_generic_header_t *generic_header;
mrcp_recog_header_t *recog_header;
if(uni_speech->is_inprogress) {
uni_recog_stop(speech);
}
ast_log(LOG_NOTICE, "Start audio '%s'\n",uni_speech_id_get(uni_speech));
mrcp_message = mrcp_application_message_create(
uni_speech->session,
uni_speech->channel,
RECOGNIZER_RECOGNIZE);
if(!mrcp_message) {
ast_log(LOG_WARNING, "Failed to create MRCP message\n");
return -1;
}
/* Get/allocate generic header */
generic_header = mrcp_generic_header_prepare(mrcp_message);
if(generic_header) {
apr_hash_index_t *it;
void *val;
const char *grammar_name;
const char *content = NULL;
/* Set generic header fields */
apt_string_assign(&generic_header->content_type,"text/uri-list",mrcp_message->pool);
mrcp_generic_header_property_add(mrcp_message,GENERIC_HEADER_CONTENT_TYPE);
/* Construct and set message body */
it = apr_hash_first(mrcp_message->pool,uni_speech->active_grammars);
if(it) {
apr_hash_this(it,NULL,NULL,&val);
grammar_name = val;
content = apr_pstrcat(mrcp_message->pool,"session:",grammar_name,NULL);
it = apr_hash_next(it);
}
for(; it; it = apr_hash_next(it)) {
apr_hash_this(it,NULL,NULL,&val);
grammar_name = val;
content = apr_pstrcat(mrcp_message->pool,content,"\nsession:",grammar_name,NULL);
}
if(content) {
apt_string_set(&mrcp_message->body,content);
}
}
/* Get/allocate recognizer header */
recog_header = (mrcp_recog_header_t*) mrcp_resource_header_prepare(mrcp_message);
if(recog_header) {
/* Set recognizer header fields */
if(mrcp_message->start_line.version == MRCP_VERSION_2) {
recog_header->cancel_if_queue = FALSE;
mrcp_resource_header_property_add(mrcp_message,RECOGNIZER_HEADER_CANCEL_IF_QUEUE);
}
recog_header->start_input_timers = TRUE;
mrcp_resource_header_property_add(mrcp_message,RECOGNIZER_HEADER_START_INPUT_TIMERS);
}
/* Reset last event (if any) */
uni_speech->mrcp_event = NULL;
/* Send MRCP request and wait for response */
if(uni_recog_mrcp_request_send(uni_speech,mrcp_message) != TRUE) {
ast_log(LOG_WARNING, "Failed to send MRCP message\n");
return -1;
}
/* Check received response */
if(!uni_speech->mrcp_response || uni_speech->mrcp_response->start_line.status_code != MRCP_STATUS_CODE_SUCCESS) {
ast_log(LOG_WARNING, "Received failure response\n");
return -1;
}
/* Reset media buffer */
mpf_frame_buffer_restart(uni_speech->media_buffer);
ast_speech_change_state(speech, AST_SPEECH_STATE_READY);
uni_speech->is_inprogress = TRUE;
return 0;
}
