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