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 /* get this tracks control block */ 66 virtual sp<IMemory> getCblk() const = 0; 67 }; 68 69 // ---------------------------------------------------------------------------- 70 71 class BnAudioTrack : public BnInterface<IAudioTrack> 72 { 73 public: 74 virtual status_t onTransact( uint32_t code, 75 const Parcel& data, 76 Parcel* reply, 77 uint32_t flags = 0); 78 }; 79 80 // ---------------------------------------------------------------------------- 81 82 }; // namespace android 83 84 #endif // ANDROID_IAUDIOTRACK_H 85