1 // Copyright (C) 2021 The Android Open Source Project 2 // 3 // Licensed under the Apache License, Version 2.0 (the "License"); 4 // you may not use this file except in compliance with the License. 5 // You may obtain a copy of the License at 6 // 7 // http://www.apache.org/licenses/LICENSE-2.0 8 // 9 // Unless required by applicable law or agreed to in writing, software 10 // distributed under the License is distributed on an "AS IS" BASIS, 11 // WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. 12 // See the License for the specific language governing permissions and 13 // limitations under the License. 14 15 #pragma once 16 17 #include <inttypes.h> 18 19 #include "AidlTypes.h" 20 21 namespace audio_proxy::service { 22 23 // Interface for audio playback. It has similar APIs to the AIDL IOutputStream. 24 class BusOutputStream { 25 public: 26 BusOutputStream(const std::string& address, const AidlAudioConfig& config, 27 int32_t flags); 28 virtual ~BusOutputStream(); 29 30 const std::string& getAddress() const; 31 const AidlAudioConfig& getConfig() const; 32 int32_t getFlags() const; 33 int getFrameSize() const; 34 35 bool prepareForWriting(uint32_t frameSize, uint32_t frameCount); 36 uint32_t getWritingFrameSize() const; 37 uint32_t getWritingFrameCount() const; 38 39 virtual bool standby() = 0; 40 virtual bool pause() = 0; 41 virtual bool resume() = 0; 42 virtual bool drain(AidlAudioDrain drain) = 0; 43 virtual bool flush() = 0; 44 virtual bool close() = 0; 45 virtual bool setVolume(float left, float right) = 0; 46 47 virtual size_t availableToWrite() = 0; 48 virtual AidlWriteStatus writeRingBuffer(const uint8_t* firstMem, 49 size_t firstLength, 50 const uint8_t* secondMem, 51 size_t secondLength) = 0; 52 53 protected: 54 virtual bool prepareForWritingImpl(uint32_t frameSize, 55 uint32_t frameCount) = 0; 56 57 const std::string mAddress; 58 const AidlAudioConfig mConfig; 59 const int32_t mFlags; 60 61 uint32_t mWritingFrameSize = 0; 62 uint32_t mWritingFrameCount = 0; 63 }; 64 65 } // namespace audio_proxy::service