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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_DOWNMIX_CORE_H_
     18 #define ANDROID_EFFECT_DOWNMIX_CORE_H_
     19 
     20 #include <system/audio_effect.h>
     21 
     22 #if __cplusplus
     23 extern "C" {
     24 #endif
     25 
     26 #define EFFECT_UIID_DOWNMIX__ { 0x381e49cc, 0xa858, 0x4aa2, 0x87f6, \
     27                               { 0xe8, 0x38, 0x8e, 0x76, 0x01, 0xb2 } }
     28 static const effect_uuid_t EFFECT_UIID_DOWNMIX_ = EFFECT_UIID_DOWNMIX__;
     29 const effect_uuid_t * const EFFECT_UIID_DOWNMIX = &EFFECT_UIID_DOWNMIX_;
     30 
     31 
     32 /* enumerated parameter settings for downmix effect */
     33 typedef enum {
     34     DOWNMIX_PARAM_TYPE
     35 } downmix_params_t;
     36 
     37 
     38 typedef enum {
     39     DOWNMIX_TYPE_INVALID                 = -1,
     40     // throw away the extra channels
     41     DOWNMIX_TYPE_STRIP                   = 0,
     42     // mix the extra channels with FL/FR
     43     DOWNMIX_TYPE_FOLD                    = 1,
     44     DOWNMIX_TYPE_CNT,
     45     DOWNMIX_TYPE_LAST = DOWNMIX_TYPE_CNT - 1
     46 } downmix_type_t;
     47 
     48 #if __cplusplus
     49 }  // extern "C"
     50 #endif
     51 
     52 
     53 #endif /*ANDROID_EFFECT_DOWNMIX_CORE_H_*/
     54