1 /* 2 * Copyright 2021 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 FLOWGRAPH_MONO_BLEND_H 18 #define FLOWGRAPH_MONO_BLEND_H 19 20 #include <sys/types.h> 21 #include <unistd.h> 22 23 #include "FlowGraphNode.h" 24 25 namespace FLOWGRAPH_OUTER_NAMESPACE::flowgraph { 26 27 /** 28 * Combine data between multiple channels so each channel is an average 29 * of all channels. 30 */ 31 class MonoBlend : public FlowGraphFilter { 32 public: 33 explicit MonoBlend(int32_t channelCount); 34 35 virtual ~MonoBlend() = default; 36 37 int32_t onProcess(int32_t numFrames) override; 38 getName()39 const char *getName() override { 40 return "MonoBlend"; 41 } 42 private: 43 const float mInvChannelCount; 44 }; 45 46 } /* namespace FLOWGRAPH_OUTER_NAMESPACE::flowgraph */ 47 48 #endif //FLOWGRAPH_MONO_BLEND 49