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#include <utils/String8.h> 28#include <media/AudioTimestamp.h> 29 30namespace android { 31 32// ---------------------------------------------------------------------------- 33 34class IAudioTrack : public IInterface 35{ 36public: 37 DECLARE_META_INTERFACE(AudioTrack); 38 39 /* Get this track's control block */ 40 virtual sp<IMemory> getCblk() const = 0; 41 42 /* After it's created the track is not active. Call start() to 43 * make it active. 44 */ 45 virtual status_t start() = 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 /* Pause a track. If set, the callback will cease being called and 59 * obtainBuffer will return an error. Buffers that are already released 60 * will continue to be processed, unless/until flush() is called. 61 */ 62 virtual void pause() = 0; 63 64 /* Attach track auxiliary output to specified effect. Use effectId = 0 65 * to detach track from effect. 66 */ 67 virtual status_t attachAuxEffect(int effectId) = 0; 68 69 /* Send parameters to the audio hardware */ 70 virtual status_t setParameters(const String8& keyValuePairs) = 0; 71 72 /* Return NO_ERROR if timestamp is valid. timestamp is undefined otherwise. */ 73 virtual status_t getTimestamp(AudioTimestamp& timestamp) = 0; 74 75 /* Signal the playback thread for a change in control block */ 76 virtual void signal() = 0; 77}; 78 79// ---------------------------------------------------------------------------- 80 81class BnAudioTrack : public BnInterface<IAudioTrack> 82{ 83public: 84 virtual status_t onTransact( uint32_t code, 85 const Parcel& data, 86 Parcel* reply, 87 uint32_t flags = 0); 88}; 89 90// ---------------------------------------------------------------------------- 91 92}; // namespace android 93 94#endif // ANDROID_IAUDIOTRACK_H 95