553 lines
19 KiB
C
553 lines
19 KiB
C
/*
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* Copyright 2008-2010 Arsen Chaloyan
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*
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* Licensed under the Apache License, Version 2.0 (the "License");
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* you may not use this file except in compliance with the License.
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* You may obtain a copy of the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS,
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* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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* See the License for the specific language governing permissions and
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* limitations under the License.
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*
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* $Id: demo_recog_engine.c 1706 2010-05-23 14:11:11Z achaloyan $
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*/
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/*
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* Mandatory rules concerning plugin implementation.
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* 1. Each plugin MUST implement a plugin/engine creator function
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* with the exact signature and name (the main entry point)
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* MRCP_PLUGIN_DECLARE(mrcp_engine_t*) mrcp_plugin_create(apr_pool_t *pool)
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* 2. Each plugin MUST declare its version number
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* MRCP_PLUGIN_VERSION_DECLARE
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* 3. One and only one response MUST be sent back to the received request.
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* 4. Methods (callbacks) of the MRCP engine channel MUST not block.
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* (asynchronous response can be sent from the context of other thread)
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* 5. Methods (callbacks) of the MPF engine stream MUST not block.
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*/
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#include "mrcp_recog_engine.h"
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#include "mpf_activity_detector.h"
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#include "apt_consumer_task.h"
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#include "apt_log.h"
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#define RECOG_ENGINE_TASK_NAME "Demo Recog Engine"
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typedef struct demo_recog_engine_t demo_recog_engine_t;
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typedef struct demo_recog_channel_t demo_recog_channel_t;
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typedef struct demo_recog_msg_t demo_recog_msg_t;
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/** Declaration of recognizer engine methods */
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static apt_bool_t demo_recog_engine_destroy(mrcp_engine_t *engine);
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static apt_bool_t demo_recog_engine_open(mrcp_engine_t *engine);
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static apt_bool_t demo_recog_engine_close(mrcp_engine_t *engine);
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static mrcp_engine_channel_t* demo_recog_engine_channel_create(mrcp_engine_t *engine, apr_pool_t *pool);
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static const struct mrcp_engine_method_vtable_t engine_vtable = {
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demo_recog_engine_destroy,
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demo_recog_engine_open,
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demo_recog_engine_close,
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demo_recog_engine_channel_create
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};
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/** Declaration of recognizer channel methods */
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static apt_bool_t demo_recog_channel_destroy(mrcp_engine_channel_t *channel);
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static apt_bool_t demo_recog_channel_open(mrcp_engine_channel_t *channel);
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static apt_bool_t demo_recog_channel_close(mrcp_engine_channel_t *channel);
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static apt_bool_t demo_recog_channel_request_process(mrcp_engine_channel_t *channel, mrcp_message_t *request);
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static const struct mrcp_engine_channel_method_vtable_t channel_vtable = {
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demo_recog_channel_destroy,
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demo_recog_channel_open,
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demo_recog_channel_close,
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demo_recog_channel_request_process
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};
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/** Declaration of recognizer audio stream methods */
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static apt_bool_t demo_recog_stream_destroy(mpf_audio_stream_t *stream);
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static apt_bool_t demo_recog_stream_open(mpf_audio_stream_t *stream, mpf_codec_t *codec);
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static apt_bool_t demo_recog_stream_close(mpf_audio_stream_t *stream);
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static apt_bool_t demo_recog_stream_write(mpf_audio_stream_t *stream, const mpf_frame_t *frame);
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static const mpf_audio_stream_vtable_t audio_stream_vtable = {
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demo_recog_stream_destroy,
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NULL,
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NULL,
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NULL,
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demo_recog_stream_open,
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demo_recog_stream_close,
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demo_recog_stream_write
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};
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/** Declaration of demo recognizer engine */
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struct demo_recog_engine_t {
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apt_consumer_task_t *task;
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};
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/** Declaration of demo recognizer channel */
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struct demo_recog_channel_t {
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/** Back pointer to engine */
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demo_recog_engine_t *demo_engine;
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/** Engine channel base */
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mrcp_engine_channel_t *channel;
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/** Active (in-progress) recognition request */
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mrcp_message_t *recog_request;
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/** Pending stop response */
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mrcp_message_t *stop_response;
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/** Indicates whether input timers are started */
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apt_bool_t timers_started;
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/** Voice activity detector */
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mpf_activity_detector_t *detector;
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/** File to write utterance to */
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FILE *audio_out;
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};
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typedef enum {
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DEMO_RECOG_MSG_OPEN_CHANNEL,
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DEMO_RECOG_MSG_CLOSE_CHANNEL,
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DEMO_RECOG_MSG_REQUEST_PROCESS
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} demo_recog_msg_type_e;
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/** Declaration of demo recognizer task message */
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struct demo_recog_msg_t {
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demo_recog_msg_type_e type;
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mrcp_engine_channel_t *channel;
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mrcp_message_t *request;
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};
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static apt_bool_t demo_recog_msg_signal(demo_recog_msg_type_e type, mrcp_engine_channel_t *channel, mrcp_message_t *request);
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static apt_bool_t demo_recog_msg_process(apt_task_t *task, apt_task_msg_t *msg);
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/** Declare this macro to set plugin version */
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MRCP_PLUGIN_VERSION_DECLARE
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/** Declare this macro to use log routine of the server, plugin is loaded from */
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MRCP_PLUGIN_LOGGER_IMPLEMENT
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/** Create demo recognizer engine */
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MRCP_PLUGIN_DECLARE(mrcp_engine_t*) mrcp_plugin_create(apr_pool_t *pool)
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{
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demo_recog_engine_t *demo_engine = apr_palloc(pool,sizeof(demo_recog_engine_t));
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apt_task_t *task;
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apt_task_vtable_t *vtable;
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apt_task_msg_pool_t *msg_pool;
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msg_pool = apt_task_msg_pool_create_dynamic(sizeof(demo_recog_msg_t),pool);
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demo_engine->task = apt_consumer_task_create(demo_engine,msg_pool,pool);
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if(!demo_engine->task) {
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return NULL;
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}
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task = apt_consumer_task_base_get(demo_engine->task);
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apt_task_name_set(task,RECOG_ENGINE_TASK_NAME);
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vtable = apt_task_vtable_get(task);
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if(vtable) {
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vtable->process_msg = demo_recog_msg_process;
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}
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/* create engine base */
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return mrcp_engine_create(
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MRCP_RECOGNIZER_RESOURCE, /* MRCP resource identifier */
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demo_engine, /* object to associate */
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&engine_vtable, /* virtual methods table of engine */
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pool); /* pool to allocate memory from */
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}
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/** Destroy recognizer engine */
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static apt_bool_t demo_recog_engine_destroy(mrcp_engine_t *engine)
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{
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demo_recog_engine_t *demo_engine = engine->obj;
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if(demo_engine->task) {
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apt_task_t *task = apt_consumer_task_base_get(demo_engine->task);
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apt_task_destroy(task);
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demo_engine->task = NULL;
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}
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return TRUE;
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}
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/** Open recognizer engine */
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static apt_bool_t demo_recog_engine_open(mrcp_engine_t *engine)
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{
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demo_recog_engine_t *demo_engine = engine->obj;
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if(demo_engine->task) {
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apt_task_t *task = apt_consumer_task_base_get(demo_engine->task);
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apt_task_start(task);
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}
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return mrcp_engine_open_respond(engine,TRUE);
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}
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/** Close recognizer engine */
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static apt_bool_t demo_recog_engine_close(mrcp_engine_t *engine)
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{
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demo_recog_engine_t *demo_engine = engine->obj;
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if(demo_engine->task) {
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apt_task_t *task = apt_consumer_task_base_get(demo_engine->task);
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apt_task_terminate(task,TRUE);
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}
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return mrcp_engine_close_respond(engine);
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}
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static mrcp_engine_channel_t* demo_recog_engine_channel_create(mrcp_engine_t *engine, apr_pool_t *pool)
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{
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mpf_stream_capabilities_t *capabilities;
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mpf_termination_t *termination;
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/* create demo recog channel */
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demo_recog_channel_t *recog_channel = apr_palloc(pool,sizeof(demo_recog_channel_t));
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recog_channel->demo_engine = engine->obj;
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recog_channel->recog_request = NULL;
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recog_channel->stop_response = NULL;
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recog_channel->detector = mpf_activity_detector_create(pool);
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recog_channel->audio_out = NULL;
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capabilities = mpf_sink_stream_capabilities_create(pool);
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mpf_codec_capabilities_add(
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&capabilities->codecs,
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MPF_SAMPLE_RATE_8000 | MPF_SAMPLE_RATE_16000,
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"LPCM");
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/* create media termination */
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termination = mrcp_engine_audio_termination_create(
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recog_channel, /* object to associate */
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&audio_stream_vtable, /* virtual methods table of audio stream */
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capabilities, /* stream capabilities */
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pool); /* pool to allocate memory from */
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/* create engine channel base */
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recog_channel->channel = mrcp_engine_channel_create(
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engine, /* engine */
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&channel_vtable, /* virtual methods table of engine channel */
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recog_channel, /* object to associate */
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termination, /* associated media termination */
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pool); /* pool to allocate memory from */
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return recog_channel->channel;
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}
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/** Destroy engine channel */
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static apt_bool_t demo_recog_channel_destroy(mrcp_engine_channel_t *channel)
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{
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/* nothing to destrtoy */
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return TRUE;
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}
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/** Open engine channel (asynchronous response MUST be sent)*/
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static apt_bool_t demo_recog_channel_open(mrcp_engine_channel_t *channel)
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{
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return demo_recog_msg_signal(DEMO_RECOG_MSG_OPEN_CHANNEL,channel,NULL);
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}
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/** Close engine channel (asynchronous response MUST be sent)*/
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static apt_bool_t demo_recog_channel_close(mrcp_engine_channel_t *channel)
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{
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return demo_recog_msg_signal(DEMO_RECOG_MSG_CLOSE_CHANNEL,channel,NULL);
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}
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/** Process MRCP channel request (asynchronous response MUST be sent)*/
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static apt_bool_t demo_recog_channel_request_process(mrcp_engine_channel_t *channel, mrcp_message_t *request)
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{
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return demo_recog_msg_signal(DEMO_RECOG_MSG_REQUEST_PROCESS,channel,request);
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}
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/** Process RECOGNIZE request */
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static apt_bool_t demo_recog_channel_recognize(mrcp_engine_channel_t *channel, mrcp_message_t *request, mrcp_message_t *response)
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{
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/* process RECOGNIZE request */
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mrcp_recog_header_t *recog_header;
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demo_recog_channel_t *recog_channel = channel->method_obj;
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recog_channel->timers_started = TRUE;
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/* get recognizer header */
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recog_header = mrcp_resource_header_get(request);
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if(recog_header) {
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if(mrcp_resource_header_property_check(request,RECOGNIZER_HEADER_START_INPUT_TIMERS) == TRUE) {
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recog_channel->timers_started = recog_header->start_input_timers;
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}
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if(mrcp_resource_header_property_check(request,RECOGNIZER_HEADER_NO_INPUT_TIMEOUT) == TRUE) {
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mpf_activity_detector_noinput_timeout_set(recog_channel->detector,recog_header->no_input_timeout);
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}
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if(mrcp_resource_header_property_check(request,RECOGNIZER_HEADER_SPEECH_COMPLETE_TIMEOUT) == TRUE) {
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mpf_activity_detector_silence_timeout_set(recog_channel->detector,recog_header->speech_complete_timeout);
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}
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}
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if(!recog_channel->audio_out) {
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const apt_dir_layout_t *dir_layout = channel->engine->dir_layout;
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const mpf_codec_descriptor_t *descriptor = mrcp_engine_sink_stream_codec_get(channel);
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char *file_name = apr_psprintf(channel->pool,"utter-%dkHz-%s.pcm",
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descriptor ? descriptor->sampling_rate/1000 : 8,
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request->channel_id.session_id.buf);
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char *file_path = apt_datadir_filepath_get(dir_layout,file_name,channel->pool);
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if(file_path) {
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recog_channel->audio_out = fopen(file_path,"wb");
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}
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}
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response->start_line.request_state = MRCP_REQUEST_STATE_INPROGRESS;
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/* send asynchronous response */
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mrcp_engine_channel_message_send(channel,response);
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recog_channel->recog_request = request;
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return TRUE;
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}
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/** Process STOP request */
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static apt_bool_t demo_recog_channel_stop(mrcp_engine_channel_t *channel, mrcp_message_t *request, mrcp_message_t *response)
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{
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/* process STOP request */
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demo_recog_channel_t *recog_channel = channel->method_obj;
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/* store STOP request, make sure there is no more activity and only then send the response */
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recog_channel->stop_response = response;
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return TRUE;
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}
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/** Process START-INPUT-TIMERS request */
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static apt_bool_t demo_recog_channel_timers_start(mrcp_engine_channel_t *channel, mrcp_message_t *request, mrcp_message_t *response)
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{
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demo_recog_channel_t *recog_channel = channel->method_obj;
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recog_channel->timers_started = TRUE;
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return mrcp_engine_channel_message_send(channel,response);
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}
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/** Dispatch MRCP request */
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static apt_bool_t demo_recog_channel_request_dispatch(mrcp_engine_channel_t *channel, mrcp_message_t *request)
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{
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apt_bool_t processed = FALSE;
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mrcp_message_t *response = mrcp_response_create(request,request->pool);
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switch(request->start_line.method_id) {
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case RECOGNIZER_SET_PARAMS:
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break;
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case RECOGNIZER_GET_PARAMS:
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break;
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case RECOGNIZER_DEFINE_GRAMMAR:
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break;
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case RECOGNIZER_RECOGNIZE:
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processed = demo_recog_channel_recognize(channel,request,response);
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break;
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case RECOGNIZER_GET_RESULT:
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break;
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case RECOGNIZER_START_INPUT_TIMERS:
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processed = demo_recog_channel_timers_start(channel,request,response);
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break;
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case RECOGNIZER_STOP:
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processed = demo_recog_channel_stop(channel,request,response);
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break;
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default:
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break;
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}
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if(processed == FALSE) {
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/* send asynchronous response for not handled request */
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mrcp_engine_channel_message_send(channel,response);
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}
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return TRUE;
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}
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/** Callback is called from MPF engine context to destroy any additional data associated with audio stream */
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static apt_bool_t demo_recog_stream_destroy(mpf_audio_stream_t *stream)
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{
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return TRUE;
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}
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/** Callback is called from MPF engine context to perform any action before open */
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static apt_bool_t demo_recog_stream_open(mpf_audio_stream_t *stream, mpf_codec_t *codec)
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{
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return TRUE;
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}
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/** Callback is called from MPF engine context to perform any action after close */
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static apt_bool_t demo_recog_stream_close(mpf_audio_stream_t *stream)
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{
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return TRUE;
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}
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/* Raise demo START-OF-INPUT event */
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static apt_bool_t demo_recog_start_of_input(demo_recog_channel_t *recog_channel)
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{
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/* create START-OF-INPUT event */
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mrcp_message_t *message = mrcp_event_create(
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recog_channel->recog_request,
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RECOGNIZER_START_OF_INPUT,
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recog_channel->recog_request->pool);
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if(!message) {
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return FALSE;
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}
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/* set request state */
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message->start_line.request_state = MRCP_REQUEST_STATE_INPROGRESS;
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/* send asynch event */
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return mrcp_engine_channel_message_send(recog_channel->channel,message);
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}
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/* Load demo recognition result */
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static apt_bool_t demo_recog_result_load(demo_recog_channel_t *recog_channel, mrcp_message_t *message)
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{
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FILE *file;
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mrcp_engine_channel_t *channel = recog_channel->channel;
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const apt_dir_layout_t *dir_layout = channel->engine->dir_layout;
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char *file_path = apt_datadir_filepath_get(dir_layout,"result.xml",message->pool);
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if(!file_path) {
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return FALSE;
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}
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/* read the demo result from file */
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file = fopen(file_path,"r");
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if(file) {
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mrcp_generic_header_t *generic_header;
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char text[1024];
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apr_size_t size;
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size = fread(text,1,sizeof(text),file);
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apt_string_assign_n(&message->body,text,size,message->pool);
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fclose(file);
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/* get/allocate generic header */
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generic_header = mrcp_generic_header_prepare(message);
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if(generic_header) {
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/* set content types */
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apt_string_assign(&generic_header->content_type,"application/x-nlsml",message->pool);
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mrcp_generic_header_property_add(message,GENERIC_HEADER_CONTENT_TYPE);
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}
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}
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return TRUE;
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}
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/* Raise demo RECOGNITION-COMPLETE event */
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static apt_bool_t demo_recog_recognition_complete(demo_recog_channel_t *recog_channel, mrcp_recog_completion_cause_e cause)
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{
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mrcp_recog_header_t *recog_header;
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/* create RECOGNITION-COMPLETE event */
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mrcp_message_t *message = mrcp_event_create(
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recog_channel->recog_request,
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RECOGNIZER_RECOGNITION_COMPLETE,
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recog_channel->recog_request->pool);
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if(!message) {
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return FALSE;
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}
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/* get/allocate recognizer header */
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recog_header = mrcp_resource_header_prepare(message);
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if(recog_header) {
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/* set completion cause */
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recog_header->completion_cause = cause;
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mrcp_resource_header_property_add(message,RECOGNIZER_HEADER_COMPLETION_CAUSE);
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}
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/* set request state */
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message->start_line.request_state = MRCP_REQUEST_STATE_COMPLETE;
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if(cause == RECOGNIZER_COMPLETION_CAUSE_SUCCESS) {
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demo_recog_result_load(recog_channel,message);
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}
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recog_channel->recog_request = NULL;
|
|
/* send asynch event */
|
|
return mrcp_engine_channel_message_send(recog_channel->channel,message);
|
|
}
|
|
|
|
/** Callback is called from MPF engine context to write/send new frame */
|
|
static apt_bool_t demo_recog_stream_write(mpf_audio_stream_t *stream, const mpf_frame_t *frame)
|
|
{
|
|
demo_recog_channel_t *recog_channel = stream->obj;
|
|
if(recog_channel->stop_response) {
|
|
/* send asynchronous response to STOP request */
|
|
mrcp_engine_channel_message_send(recog_channel->channel,recog_channel->stop_response);
|
|
recog_channel->stop_response = NULL;
|
|
recog_channel->recog_request = NULL;
|
|
return TRUE;
|
|
}
|
|
|
|
if(recog_channel->recog_request) {
|
|
mpf_detector_event_e det_event = mpf_activity_detector_process(recog_channel->detector,frame);
|
|
switch(det_event) {
|
|
case MPF_DETECTOR_EVENT_ACTIVITY:
|
|
apt_log(APT_LOG_MARK,APT_PRIO_INFO,"Detected Voice Activity "APT_SIDRES_FMT,
|
|
MRCP_MESSAGE_SIDRES(recog_channel->recog_request));
|
|
demo_recog_start_of_input(recog_channel);
|
|
break;
|
|
case MPF_DETECTOR_EVENT_INACTIVITY:
|
|
apt_log(APT_LOG_MARK,APT_PRIO_INFO,"Detected Voice Inactivity "APT_SIDRES_FMT,
|
|
MRCP_MESSAGE_SIDRES(recog_channel->recog_request));
|
|
demo_recog_recognition_complete(recog_channel,RECOGNIZER_COMPLETION_CAUSE_SUCCESS);
|
|
break;
|
|
case MPF_DETECTOR_EVENT_NOINPUT:
|
|
apt_log(APT_LOG_MARK,APT_PRIO_INFO,"Detected Noinput "APT_SIDRES_FMT,
|
|
MRCP_MESSAGE_SIDRES(recog_channel->recog_request));
|
|
if(recog_channel->timers_started == TRUE) {
|
|
demo_recog_recognition_complete(recog_channel,RECOGNIZER_COMPLETION_CAUSE_NO_INPUT_TIMEOUT);
|
|
}
|
|
break;
|
|
default:
|
|
break;
|
|
}
|
|
|
|
if((frame->type & MEDIA_FRAME_TYPE_EVENT) == MEDIA_FRAME_TYPE_EVENT) {
|
|
if(frame->marker == MPF_MARKER_START_OF_EVENT) {
|
|
apt_log(APT_LOG_MARK,APT_PRIO_INFO,"Detected Start of Event "APT_SIDRES_FMT" id:%d",
|
|
MRCP_MESSAGE_SIDRES(recog_channel->recog_request),
|
|
frame->event_frame.event_id);
|
|
}
|
|
else if(frame->marker == MPF_MARKER_END_OF_EVENT) {
|
|
apt_log(APT_LOG_MARK,APT_PRIO_INFO,"Detected End of Event "APT_SIDRES_FMT" id:%d duration:%d ts",
|
|
MRCP_MESSAGE_SIDRES(recog_channel->recog_request),
|
|
frame->event_frame.event_id,
|
|
frame->event_frame.duration);
|
|
}
|
|
}
|
|
|
|
if(recog_channel->audio_out) {
|
|
fwrite(frame->codec_frame.buffer,1,frame->codec_frame.size,recog_channel->audio_out);
|
|
}
|
|
}
|
|
return TRUE;
|
|
}
|
|
|
|
static apt_bool_t demo_recog_msg_signal(demo_recog_msg_type_e type, mrcp_engine_channel_t *channel, mrcp_message_t *request)
|
|
{
|
|
apt_bool_t status = FALSE;
|
|
demo_recog_channel_t *demo_channel = channel->method_obj;
|
|
demo_recog_engine_t *demo_engine = demo_channel->demo_engine;
|
|
apt_task_t *task = apt_consumer_task_base_get(demo_engine->task);
|
|
apt_task_msg_t *msg = apt_task_msg_get(task);
|
|
if(msg) {
|
|
demo_recog_msg_t *demo_msg;
|
|
msg->type = TASK_MSG_USER;
|
|
demo_msg = (demo_recog_msg_t*) msg->data;
|
|
|
|
demo_msg->type = type;
|
|
demo_msg->channel = channel;
|
|
demo_msg->request = request;
|
|
status = apt_task_msg_signal(task,msg);
|
|
}
|
|
return status;
|
|
}
|
|
|
|
static apt_bool_t demo_recog_msg_process(apt_task_t *task, apt_task_msg_t *msg)
|
|
{
|
|
demo_recog_msg_t *demo_msg = (demo_recog_msg_t*)msg->data;
|
|
switch(demo_msg->type) {
|
|
case DEMO_RECOG_MSG_OPEN_CHANNEL:
|
|
/* open channel and send asynch response */
|
|
mrcp_engine_channel_open_respond(demo_msg->channel,TRUE);
|
|
break;
|
|
case DEMO_RECOG_MSG_CLOSE_CHANNEL:
|
|
{
|
|
/* close channel, make sure there is no activity and send asynch response */
|
|
demo_recog_channel_t *recog_channel = demo_msg->channel->method_obj;
|
|
if(recog_channel->audio_out) {
|
|
fclose(recog_channel->audio_out);
|
|
recog_channel->audio_out = NULL;
|
|
}
|
|
|
|
mrcp_engine_channel_close_respond(demo_msg->channel);
|
|
break;
|
|
}
|
|
case DEMO_RECOG_MSG_REQUEST_PROCESS:
|
|
demo_recog_channel_request_dispatch(demo_msg->channel,demo_msg->request);
|
|
break;
|
|
default:
|
|
break;
|
|
}
|
|
return TRUE;
|
|
}
|