1 /*
2  * Copyright (C) 2010 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_EFFECTCBASESHARED_H
18 #define ANDROID_EFFECTCBASESHARED_H
19 
20 #include <stdint.h>
21 #include <sys/types.h>
22 
23 #include <utils/threads.h>
24 
25 namespace android {
26 
27 // ----------------------------------------------------------------------------
28 
29 // Size of buffer used to exchange parameters between application and mediaserver processes.
30 #define EFFECT_PARAM_BUFFER_SIZE 1024
31 
32 
33 // Shared memory area used to exchange parameters between application and mediaserver
34 // process.
35 struct effect_param_cblk_t
36 {
37                 Mutex       lock;
38     volatile    uint32_t    clientIndex;    // Current read/write index for application
39     volatile    uint32_t    serverIndex;    // Current read/write index for mediaserver
40                 uint8_t*    buffer;         // start of parameter buffer
41 
effect_param_cblk_teffect_param_cblk_t42                 effect_param_cblk_t()
43                     : lock(Mutex::SHARED), clientIndex(0), serverIndex(0) {}
44 };
45 
46 
47 // ----------------------------------------------------------------------------
48 
49 }; // namespace android
50 
51 #endif // ANDROID_EFFECTCBASESHARED_H
52