1 /*
2  * Copyright (C) 2016 The Android Open Source Project
3  *
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
7  *
8  *      http://www.apache.org/licenses/LICENSE-2.0
9  *
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.
15  */
16 
17 #ifndef ANDROID_EFFECT_EQUALIZER_CORE_H_
18 #define ANDROID_EFFECT_EQUALIZER_CORE_H_
19 
20 #include <system/audio_effect.h>
21 
22 #ifndef OPENSL_ES_H_
23 static const effect_uuid_t SL_IID_EQUALIZER_ = { 0x0bed4300, 0xddd6, 0x11db, 0x8f34,
24         { 0x00, 0x02, 0xa5, 0xd5, 0xc5, 0x1b } };
25 const effect_uuid_t * const SL_IID_EQUALIZER = &SL_IID_EQUALIZER_;
26 #endif //OPENSL_ES_H_
27 
28 #if __cplusplus
29 extern "C" {
30 #endif
31 
32 /* enumerated parameters for Equalizer effect */
33 typedef enum
34 {
35     EQ_PARAM_NUM_BANDS,             // Gets the number of frequency bands that the equalizer
36                                     // supports.
37     EQ_PARAM_LEVEL_RANGE,           // Returns the minimum and maximum band levels supported.
38     EQ_PARAM_BAND_LEVEL,            // Gets/Sets the gain set for the given equalizer band.
39     EQ_PARAM_CENTER_FREQ,           // Gets the center frequency of the given band.
40     EQ_PARAM_BAND_FREQ_RANGE,       // Gets the frequency range of the given frequency band.
41     EQ_PARAM_GET_BAND,              // Gets the band that has the most effect on the given
42                                     // frequency.
43     EQ_PARAM_CUR_PRESET,            // Gets/Sets the current preset.
44     EQ_PARAM_GET_NUM_OF_PRESETS,    // Gets the total number of presets the equalizer supports.
45     EQ_PARAM_GET_PRESET_NAME,       // Gets the preset name based on the index.
46     EQ_PARAM_PROPERTIES             // Gets/Sets all parameters at a time.
47 } t_equalizer_params;
48 
49 //t_equalizer_settings groups all current equalizer setting for backup and restore.
50 typedef struct s_equalizer_settings {
51     uint16_t curPreset;
52     uint16_t numBands;
53     uint16_t bandLevels[];
54 } t_equalizer_settings;
55 
56 #if __cplusplus
57 }  // extern "C"
58 #endif
59 
60 
61 #endif /*ANDROID_EFFECT_EQUALIZER_CORE_H_*/
62