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/LinearTransform.h> 28 29 namespace android { 30 31 // ---------------------------------------------------------------------------- 32 33 class IAudioTrack : public IInterface 34 { 35 public: 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. 43 */ 44 virtual status_t start() = 0; 45 46 /* Stop a track. If set, the callback will cease being called and 47 * obtainBuffer will return an error. Buffers that are already released 48 * will continue to be processed, unless/until flush() is called. 49 */ 50 virtual void stop() = 0; 51 52 /* Flush a stopped or paused track. All pending/released buffers are discarded. 53 * This function has no effect if the track is not stopped or paused. 54 */ 55 virtual void flush() = 0; 56 57 /* Mute or unmute this track. 58 * While muted, the callback, if set, is still called. 59 */ 60 virtual void mute(bool) = 0; 61 62 /* Pause a track. If set, the callback will cease being called and 63 * obtainBuffer will return an error. Buffers that are already released 64 * will continue to be processed, unless/until flush() is called. 65 */ 66 virtual void pause() = 0; 67 68 /* Attach track auxiliary output to specified effect. Use effectId = 0 69 * to detach track from effect. 70 */ 71 virtual status_t attachAuxEffect(int effectId) = 0; 72 73 74 /* Allocate a shared memory buffer suitable for holding timed audio 75 samples */ 76 virtual status_t allocateTimedBuffer(size_t size, 77 sp<IMemory>* buffer) = 0; 78 79 /* Queue a buffer obtained via allocateTimedBuffer for playback at the given 80 timestamp */ 81 virtual status_t queueTimedBuffer(const sp<IMemory>& buffer, 82 int64_t pts) = 0; 83 84 /* Define the linear transform that will be applied to the timestamps 85 given to queueTimedBuffer (which are expressed in media time). 86 Target specifies whether this transform converts media time to local time 87 or Tungsten time. The values for target are defined in AudioTrack.h */ 88 virtual status_t setMediaTimeTransform(const LinearTransform& xform, 89 int target) = 0; 90 }; 91 92 // ---------------------------------------------------------------------------- 93 94 class BnAudioTrack : public BnInterface<IAudioTrack> 95 { 96 public: 97 virtual status_t onTransact( uint32_t code, 98 const Parcel& data, 99 Parcel* reply, 100 uint32_t flags = 0); 101 }; 102 103 // ---------------------------------------------------------------------------- 104 105 }; // namespace android 106 107 #endif // ANDROID_IAUDIOTRACK_H 108