1*05767d91SRobert Wu /* 2*05767d91SRobert Wu * Copyright 2018 The Android Open Source Project 3*05767d91SRobert Wu * 4*05767d91SRobert Wu * Licensed under the Apache License, Version 2.0 (the "License"); 5*05767d91SRobert Wu * you may not use this file except in compliance with the License. 6*05767d91SRobert Wu * You may obtain a copy of the License at 7*05767d91SRobert Wu * 8*05767d91SRobert Wu * http://www.apache.org/licenses/LICENSE-2.0 9*05767d91SRobert Wu * 10*05767d91SRobert Wu * Unless required by applicable law or agreed to in writing, software 11*05767d91SRobert Wu * distributed under the License is distributed on an "AS IS" BASIS, 12*05767d91SRobert Wu * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. 13*05767d91SRobert Wu * See the License for the specific language governing permissions and 14*05767d91SRobert Wu * limitations under the License. 15*05767d91SRobert Wu */ 16*05767d91SRobert Wu 17*05767d91SRobert Wu #ifndef OBOE_STABILIZEDCALLBACK_H 18*05767d91SRobert Wu #define OBOE_STABILIZEDCALLBACK_H 19*05767d91SRobert Wu 20*05767d91SRobert Wu #include <cstdint> 21*05767d91SRobert Wu #include "oboe/AudioStream.h" 22*05767d91SRobert Wu 23*05767d91SRobert Wu namespace oboe { 24*05767d91SRobert Wu 25*05767d91SRobert Wu class StabilizedCallback : public AudioStreamCallback { 26*05767d91SRobert Wu 27*05767d91SRobert Wu public: 28*05767d91SRobert Wu explicit StabilizedCallback(AudioStreamCallback *callback); 29*05767d91SRobert Wu 30*05767d91SRobert Wu DataCallbackResult 31*05767d91SRobert Wu onAudioReady(AudioStream *oboeStream, void *audioData, int32_t numFrames) override; 32*05767d91SRobert Wu onErrorBeforeClose(AudioStream * oboeStream,Result error)33*05767d91SRobert Wu void onErrorBeforeClose(AudioStream *oboeStream, Result error) override { 34*05767d91SRobert Wu return mCallback->onErrorBeforeClose(oboeStream, error); 35*05767d91SRobert Wu } 36*05767d91SRobert Wu onErrorAfterClose(AudioStream * oboeStream,Result error)37*05767d91SRobert Wu void onErrorAfterClose(AudioStream *oboeStream, Result error) override { 38*05767d91SRobert Wu 39*05767d91SRobert Wu // Reset all fields now that the stream has been closed 40*05767d91SRobert Wu mFrameCount = 0; 41*05767d91SRobert Wu mEpochTimeNanos = 0; 42*05767d91SRobert Wu mOpsPerNano = 1; 43*05767d91SRobert Wu return mCallback->onErrorAfterClose(oboeStream, error); 44*05767d91SRobert Wu } 45*05767d91SRobert Wu 46*05767d91SRobert Wu private: 47*05767d91SRobert Wu 48*05767d91SRobert Wu AudioStreamCallback *mCallback = nullptr; 49*05767d91SRobert Wu int64_t mFrameCount = 0; 50*05767d91SRobert Wu int64_t mEpochTimeNanos = 0; 51*05767d91SRobert Wu double mOpsPerNano = 1; 52*05767d91SRobert Wu 53*05767d91SRobert Wu void generateLoad(int64_t durationNanos); 54*05767d91SRobert Wu }; 55*05767d91SRobert Wu 56*05767d91SRobert Wu /** 57*05767d91SRobert Wu * cpu_relax is an architecture specific method of telling the CPU that you don't want it to 58*05767d91SRobert Wu * do much work. asm volatile keeps the compiler from optimising these instructions out. 59*05767d91SRobert Wu */ 60*05767d91SRobert Wu #if defined(__i386__) || defined(__x86_64__) 61*05767d91SRobert Wu #define cpu_relax() asm volatile("rep; nop" ::: "memory"); 62*05767d91SRobert Wu 63*05767d91SRobert Wu #elif defined(__arm__) || defined(__mips__) || defined(__riscv) 64*05767d91SRobert Wu #define cpu_relax() asm volatile("":::"memory") 65*05767d91SRobert Wu 66*05767d91SRobert Wu #elif defined(__aarch64__) 67*05767d91SRobert Wu #define cpu_relax() asm volatile("yield" ::: "memory") 68*05767d91SRobert Wu 69*05767d91SRobert Wu #else 70*05767d91SRobert Wu #error "cpu_relax is not defined for this architecture" 71*05767d91SRobert Wu #endif 72*05767d91SRobert Wu 73*05767d91SRobert Wu } 74*05767d91SRobert Wu 75*05767d91SRobert Wu #endif //OBOE_STABILIZEDCALLBACK_H 76