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 #include <media/VolumeShaper.h> 30 31 namespace android { 32 33 // ---------------------------------------------------------------------------- 34 35 class IAudioTrack : public IInterface 36 { 37 public: 38 DECLARE_META_INTERFACE(AudioTrack); 39 40 /* Get this track's control block */ 41 virtual sp<IMemory> getCblk() const = 0; 42 43 /* After it's created the track is not active. Call start() to 44 * make it active. 45 */ 46 virtual status_t start() = 0; 47 48 /* Stop a track. If set, the callback will cease being called and 49 * obtainBuffer will return an error. Buffers that are already released 50 * will continue to be processed, unless/until flush() is called. 51 */ 52 virtual void stop() = 0; 53 54 /* Flush a stopped or paused track. All pending/released buffers are discarded. 55 * This function has no effect if the track is not stopped or paused. 56 */ 57 virtual void flush() = 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 continue to be processed, unless/until 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 /* Send parameters to the audio hardware */ 71 virtual status_t setParameters(const String8& keyValuePairs) = 0; 72 73 /* Return NO_ERROR if timestamp is valid. timestamp is undefined otherwise. */ 74 virtual status_t getTimestamp(AudioTimestamp& timestamp) = 0; 75 76 /* Signal the playback thread for a change in control block */ 77 virtual void signal() = 0; 78 79 /* Sets the volume shaper */ 80 virtual media::VolumeShaper::Status applyVolumeShaper( 81 const sp<media::VolumeShaper::Configuration>& configuration, 82 const sp<media::VolumeShaper::Operation>& operation) = 0; 83 84 /* gets the volume shaper state */ 85 virtual sp<media::VolumeShaper::State> getVolumeShaperState(int id) = 0; 86 }; 87 88 // ---------------------------------------------------------------------------- 89 90 class BnAudioTrack : public BnInterface<IAudioTrack> 91 { 92 public: 93 virtual status_t onTransact( uint32_t code, 94 const Parcel& data, 95 Parcel* reply, 96 uint32_t flags = 0); 97 }; 98 99 // ---------------------------------------------------------------------------- 100 101 }; // namespace android 102 103 #endif // ANDROID_IAUDIOTRACK_H 104
