1 /*
2  * Copyright (C) 2007 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_IAUDIOTRACK_H
18 #define ANDROID_IAUDIOTRACK_H
19 
20 #include <stdint.h>
21 #include <sys/types.h>
22 
23 #include <utils/RefBase.h>
24 #include <utils/Errors.h>
25 #include <binder/IInterface.h>
26 #include <binder/IMemory.h>
27 
28 
29 namespace android {
30 
31 // ----------------------------------------------------------------------------
32 
33 class IAudioTrack : public IInterface
34 {
35 public:
36     DECLARE_META_INTERFACE(AudioTrack);
37 
38     /* After it's created the track is not active. Call start() to
39      * make it active. If set, the callback will start being called.
40      */
41     virtual status_t    start() = 0;
42 
43     /* Stop a track. If set, the callback will cease being called and
44      * obtainBuffer will return an error. Buffers that are already released
45      * will be processed, unless flush() is called.
46      */
47     virtual void        stop() = 0;
48 
49     /* flush a stopped track. All pending buffers are discarded.
50      * This function has no effect if the track is not stoped.
51      */
52     virtual void        flush() = 0;
53 
54     /* mute or unmutes this track.
55      * While mutted, the callback, if set, is still called.
56      */
57     virtual void        mute(bool) = 0;
58 
59     /* Pause a track. If set, the callback will cease being called and
60      * obtainBuffer will return an error. Buffers that are already released
61      * will be processed, unless flush() is called.
62      */
63     virtual void        pause() = 0;
64 
65     /* Attach track auxiliary output to specified effect. Use effectId = 0
66      * to detach track from effect.
67      */
68     virtual status_t    attachAuxEffect(int effectId) = 0;
69 
70     /* get this tracks control block */
71     virtual sp<IMemory> getCblk() const = 0;
72 };
73 
74 // ----------------------------------------------------------------------------
75 
76 class BnAudioTrack : public BnInterface<IAudioTrack>
77 {
78 public:
79     virtual status_t    onTransact( uint32_t code,
80                                     const Parcel& data,
81                                     Parcel* reply,
82                                     uint32_t flags = 0);
83 };
84 
85 // ----------------------------------------------------------------------------
86 
87 }; // namespace android
88 
89 #endif // ANDROID_IAUDIOTRACK_H
90