1*05767d91SRobert Wu /* 2*05767d91SRobert Wu * Copyright 2019 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 FLOWGRAPH_SAMPLE_RATE_CONVERTER_H 18*05767d91SRobert Wu #define FLOWGRAPH_SAMPLE_RATE_CONVERTER_H 19*05767d91SRobert Wu 20*05767d91SRobert Wu #include <unistd.h> 21*05767d91SRobert Wu #include <sys/types.h> 22*05767d91SRobert Wu 23*05767d91SRobert Wu #include "FlowGraphNode.h" 24*05767d91SRobert Wu #include "resampler/MultiChannelResampler.h" 25*05767d91SRobert Wu 26*05767d91SRobert Wu namespace FLOWGRAPH_OUTER_NAMESPACE::flowgraph { 27*05767d91SRobert Wu 28*05767d91SRobert Wu class SampleRateConverter : public FlowGraphFilter { 29*05767d91SRobert Wu public: 30*05767d91SRobert Wu explicit SampleRateConverter(int32_t channelCount, 31*05767d91SRobert Wu resampler::MultiChannelResampler &mResampler); 32*05767d91SRobert Wu 33*05767d91SRobert Wu virtual ~SampleRateConverter() = default; 34*05767d91SRobert Wu 35*05767d91SRobert Wu int32_t onProcess(int32_t numFrames) override; 36*05767d91SRobert Wu getName()37*05767d91SRobert Wu const char *getName() override { 38*05767d91SRobert Wu return "SampleRateConverter"; 39*05767d91SRobert Wu } 40*05767d91SRobert Wu 41*05767d91SRobert Wu void reset() override; 42*05767d91SRobert Wu 43*05767d91SRobert Wu private: 44*05767d91SRobert Wu 45*05767d91SRobert Wu // Return true if there is a sample available. 46*05767d91SRobert Wu bool isInputAvailable(); 47*05767d91SRobert Wu 48*05767d91SRobert Wu // This assumes data is available. Only call after calling isInputAvailable(). 49*05767d91SRobert Wu const float *getNextInputFrame(); 50*05767d91SRobert Wu 51*05767d91SRobert Wu resampler::MultiChannelResampler &mResampler; 52*05767d91SRobert Wu 53*05767d91SRobert Wu int32_t mInputCursor = 0; // offset into the input port buffer 54*05767d91SRobert Wu int32_t mNumValidInputFrames = 0; // number of valid frames currently in the input port buffer 55*05767d91SRobert Wu // We need our own callCount for upstream calls because calls occur at a different rate. 56*05767d91SRobert Wu // This means we cannot have cyclic graphs or merges that contain an SRC. 57*05767d91SRobert Wu int64_t mInputCallCount = 0; 58*05767d91SRobert Wu 59*05767d91SRobert Wu }; 60*05767d91SRobert Wu 61*05767d91SRobert Wu } /* namespace FLOWGRAPH_OUTER_NAMESPACE::flowgraph */ 62*05767d91SRobert Wu 63*05767d91SRobert Wu #endif //FLOWGRAPH_SAMPLE_RATE_CONVERTER_H 64