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      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