IAudioTrack.h revision 99e53b86eebb605b70dd7591b89bf61a9414ed0e
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 29namespace android { 30 31// ---------------------------------------------------------------------------- 32 33class IAudioTrack : public IInterface 34{ 35public: 36 DECLARE_META_INTERFACE(AudioTrack); 37 38 /* Get this track's control block */ 39 virtual sp<IMemory> getCblk() const = 0; 40 41 /* After it's created the track is not active. Call start() to 42 * make it active. If set, the callback will start being called. 43 * tid identifies the client callback thread, or 0 if not needed. 44 */ 45 virtual status_t start(pid_t tid) = 0; 46 47 /* Stop a track. If set, the callback will cease being called and 48 * obtainBuffer will return an error. Buffers that are already released 49 * will continue to be processed, unless/until flush() is called. 50 */ 51 virtual void stop() = 0; 52 53 /* Flush a stopped or paused track. All pending/released buffers are discarded. 54 * This function has no effect if the track is not stopped or paused. 55 */ 56 virtual void flush() = 0; 57 58 /* Mute or unmute this track. 59 * While muted, the callback, if set, is still called. 60 */ 61 virtual void mute(bool) = 0; 62 63 /* Pause a track. If set, the callback will cease being called and 64 * obtainBuffer will return an error. Buffers that are already released 65 * will continue to be processed, unless/until flush() is called. 66 */ 67 virtual void pause() = 0; 68 69 /* Attach track auxiliary output to specified effect. Use effectId = 0 70 * to detach track from effect. 71 */ 72 virtual status_t attachAuxEffect(int effectId) = 0; 73 74}; 75 76// ---------------------------------------------------------------------------- 77 78class BnAudioTrack : public BnInterface<IAudioTrack> 79{ 80public: 81 virtual status_t onTransact( uint32_t code, 82 const Parcel& data, 83 Parcel* reply, 84 uint32_t flags = 0); 85}; 86 87// ---------------------------------------------------------------------------- 88 89}; // namespace android 90 91#endif // ANDROID_IAUDIOTRACK_H 92