2 * Copyright (C) 2014 The Android Open Source Project
4 * Licensed under the Apache License, Version 2.0 (the "License");
5 * you may not use this file except in compliance with the License.
6 * You may obtain a copy of the License at
8 * http://www.apache.org/licenses/LICENSE-2.0
10 * Unless required by applicable law or agreed to in writing, software
11 * distributed under the License is distributed on an "AS IS" BASIS,
12 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
13 * See the License for the specific language governing permissions and
14 * limitations under the License.
17 #ifndef ANDROID_SOUND_TRIGGER_H
18 #define ANDROID_SOUND_TRIGGER_H
21 #include <system/audio.h>
23 #define SOUND_TRIGGER_MAX_STRING_LEN 64 /* max length of strings in properties or
25 #define SOUND_TRIGGER_MAX_LOCALE_LEN 6 /* max length of locale string. e.g en_US */
26 #define SOUND_TRIGGER_MAX_USERS 10 /* max number of concurrent users */
27 #define SOUND_TRIGGER_MAX_PHRASES 10 /* max number of concurrent phrases */
30 SOUND_TRIGGER_STATE_NO_INIT = -1, /* The sound trigger service is not initialized */
31 SOUND_TRIGGER_STATE_ENABLED = 0, /* The sound trigger service is enabled */
32 SOUND_TRIGGER_STATE_DISABLED = 1 /* The sound trigger service is disabled */
33 } sound_trigger_service_state_t;
35 #define RECOGNITION_MODE_VOICE_TRIGGER 0x1 /* simple voice trigger */
36 #define RECOGNITION_MODE_USER_IDENTIFICATION 0x2 /* trigger only if one user in model identified */
37 #define RECOGNITION_MODE_USER_AUTHENTICATION 0x4 /* trigger only if one user in mode
39 #define RECOGNITION_MODE_GENERIC_TRIGGER 0x8 /* generic sound trigger */
41 #define RECOGNITION_STATUS_SUCCESS 0
42 #define RECOGNITION_STATUS_ABORT 1
43 #define RECOGNITION_STATUS_FAILURE 2
45 #define SOUND_MODEL_STATUS_UPDATED 0
48 SOUND_MODEL_TYPE_UNKNOWN = -1, /* use for unspecified sound model type */
49 SOUND_MODEL_TYPE_KEYPHRASE = 0, /* use for key phrase sound models */
50 SOUND_MODEL_TYPE_GENERIC = 1 /* use for all models other than keyphrase */
51 } sound_trigger_sound_model_type_t;
53 typedef audio_uuid_t sound_trigger_uuid_t;
56 * sound trigger implementation descriptor read by the framework via get_properties().
57 * Used by SoundTrigger service to report to applications and manage concurrency and policy.
59 struct sound_trigger_properties {
60 char implementor[SOUND_TRIGGER_MAX_STRING_LEN]; /* implementor name */
61 char description[SOUND_TRIGGER_MAX_STRING_LEN]; /* implementation description */
62 unsigned int version; /* implementation version */
63 sound_trigger_uuid_t uuid; /* unique implementation ID.
64 Must change with version each version */
65 unsigned int max_sound_models; /* maximum number of concurrent sound models
67 unsigned int max_key_phrases; /* maximum number of key phrases */
68 unsigned int max_users; /* maximum number of concurrent users detected */
69 unsigned int recognition_modes; /* all supported modes.
70 e.g RECOGNITION_MODE_VOICE_TRIGGER */
71 bool capture_transition; /* supports seamless transition from detection
73 unsigned int max_buffer_ms; /* maximum buffering capacity in ms if
74 capture_transition is true*/
75 bool concurrent_capture; /* supports capture by other use cases while
76 detection is active */
77 bool trigger_in_event; /* returns the trigger capture in event */
78 unsigned int power_consumption_mw; /* Rated power consumption when detection is active
79 with TDB silence/sound/speech ratio */
82 typedef int sound_trigger_module_handle_t;
84 struct sound_trigger_module_descriptor {
85 sound_trigger_module_handle_t handle;
86 struct sound_trigger_properties properties;
89 typedef int sound_model_handle_t;
92 * Base sound model descriptor. This struct is the header of a larger block passed to
93 * load_sound_model() and containing the binary data of the sound model.
94 * Proprietary representation of users in binary data must match information indicated
97 struct sound_trigger_sound_model {
98 sound_trigger_sound_model_type_t type; /* model type. e.g. SOUND_MODEL_TYPE_KEYPHRASE */
99 sound_trigger_uuid_t uuid; /* unique sound model ID. */
100 sound_trigger_uuid_t vendor_uuid; /* unique vendor ID. Identifies the engine the
101 sound model was build for */
102 unsigned int data_size; /* size of opaque model data */
103 unsigned int data_offset; /* offset of opaque data start from head of struct
104 (e.g sizeof struct sound_trigger_sound_model) */
107 /* key phrase descriptor */
108 struct sound_trigger_phrase {
109 unsigned int id; /* keyphrase ID */
110 unsigned int recognition_mode; /* recognition modes supported by this key phrase */
111 unsigned int num_users; /* number of users in the key phrase */
112 unsigned int users[SOUND_TRIGGER_MAX_USERS]; /* users ids: (not uid_t but sound trigger
114 char locale[SOUND_TRIGGER_MAX_LOCALE_LEN]; /* locale - JAVA Locale style (e.g. en_US) */
115 char text[SOUND_TRIGGER_MAX_STRING_LEN]; /* phrase text in UTF-8 format. */
119 * Specialized sound model for key phrase detection.
120 * Proprietary representation of key phrases in binary data must match information indicated
123 struct sound_trigger_phrase_sound_model {
124 struct sound_trigger_sound_model common;
125 unsigned int num_phrases; /* number of key phrases in model */
126 struct sound_trigger_phrase phrases[SOUND_TRIGGER_MAX_PHRASES];
131 * Generic sound model, used for all cases except key phrase detection.
133 struct sound_trigger_generic_sound_model {
134 struct sound_trigger_sound_model common;
139 * Generic recognition event sent via recognition callback
141 struct sound_trigger_recognition_event {
142 int status; /* recognition status e.g.
143 RECOGNITION_STATUS_SUCCESS */
144 sound_trigger_sound_model_type_t type; /* event type, same as sound model type.
145 e.g. SOUND_MODEL_TYPE_KEYPHRASE */
146 sound_model_handle_t model; /* loaded sound model that triggered the
148 bool capture_available; /* it is possible to capture audio from this
149 utterance buffered by the
151 int capture_session; /* audio session ID. framework use */
152 int capture_delay_ms; /* delay in ms between end of model
153 detection and start of audio available
154 for capture. A negative value is possible
155 (e.g. if key phrase is also available for
157 int capture_preamble_ms; /* duration in ms of audio captured
158 before the start of the trigger.
160 bool trigger_in_data; /* the opaque data is the capture of
162 audio_config_t audio_config; /* audio format of either the trigger in
163 event data or to use for capture of the
164 rest of the utterance */
165 unsigned int data_size; /* size of opaque event data */
166 unsigned int data_offset; /* offset of opaque data start from start of
167 this struct (e.g sizeof struct
168 sound_trigger_phrase_recognition_event) */
172 * Confidence level for each user in struct sound_trigger_phrase_recognition_extra
174 struct sound_trigger_confidence_level {
175 unsigned int user_id; /* user ID */
176 unsigned int level; /* confidence level in percent (0 - 100).
177 - min level for recognition configuration
178 - detected level for recognition event */
182 * Specialized recognition event for key phrase detection
184 struct sound_trigger_phrase_recognition_extra {
185 unsigned int id; /* keyphrase ID */
186 unsigned int recognition_modes; /* recognition modes used for this keyphrase */
187 unsigned int confidence_level; /* confidence level for mode RECOGNITION_MODE_VOICE_TRIGGER */
188 unsigned int num_levels; /* number of user confidence levels */
189 struct sound_trigger_confidence_level levels[SOUND_TRIGGER_MAX_USERS];
192 struct sound_trigger_phrase_recognition_event {
193 struct sound_trigger_recognition_event common;
194 unsigned int num_phrases;
195 struct sound_trigger_phrase_recognition_extra phrase_extras[SOUND_TRIGGER_MAX_PHRASES];
198 struct sound_trigger_generic_recognition_event {
199 struct sound_trigger_recognition_event common;
203 * configuration for sound trigger capture session passed to start_recognition()
205 struct sound_trigger_recognition_config {
206 audio_io_handle_t capture_handle; /* IO handle that will be used for capture.
207 N/A if capture_requested is false */
208 audio_devices_t capture_device; /* input device requested for detection capture */
209 bool capture_requested; /* capture and buffer audio for this recognition
211 unsigned int num_phrases; /* number of key phrases recognition extras */
212 struct sound_trigger_phrase_recognition_extra phrases[SOUND_TRIGGER_MAX_PHRASES];
213 /* configuration for each key phrase */
214 unsigned int data_size; /* size of opaque capture configuration data */
215 unsigned int data_offset; /* offset of opaque data start from start of this struct
216 (e.g sizeof struct sound_trigger_recognition_config) */
220 * Event sent via load sound model callback
222 struct sound_trigger_model_event {
223 int status; /* sound model status e.g. SOUND_MODEL_STATUS_UPDATED */
224 sound_model_handle_t model; /* loaded sound model that triggered the event */
225 unsigned int data_size; /* size of event data if any. Size of updated sound model if
226 status is SOUND_MODEL_STATUS_UPDATED */
227 unsigned int data_offset; /* offset of data start from start of this struct
228 (e.g sizeof struct sound_trigger_model_event) */
232 #endif // ANDROID_SOUND_TRIGGER_H