1 /* 2 * Copyright (C) 2018 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_AAUDIO_FLOW_GRAPH_H 18 #define ANDROID_AAUDIO_FLOW_GRAPH_H 19 20 #include <memory> 21 #include <stdint.h> 22 #include <sys/types.h> 23 #include <system/audio.h> 24 25 #include <aaudio/AAudio.h> 26 #include <flowgraph/ClipToRange.h> 27 #include <flowgraph/MonoToMultiConverter.h> 28 #include <flowgraph/RampLinear.h> 29 30 class AAudioFlowGraph { 31 public: 32 /** Connect several modules together to convert from source to sink. 33 * This should only be called once for each instance. 34 * 35 * @param sourceFormat 36 * @param sourceChannelCount 37 * @param sinkFormat 38 * @param sinkChannelCount 39 * @return 40 */ 41 aaudio_result_t configure(audio_format_t sourceFormat, 42 int32_t sourceChannelCount, 43 audio_format_t sinkFormat, 44 int32_t sinkChannelCount); 45 46 void process(const void *source, void *destination, int32_t numFrames); 47 48 /** 49 * @param volume between 0.0 and 1.0 50 */ 51 void setTargetVolume(float volume); 52 53 void setRampLengthInFrames(int32_t numFrames); 54 55 private: 56 std::unique_ptr<flowgraph::AudioSource> mSource; 57 std::unique_ptr<flowgraph::RampLinear> mVolumeRamp; 58 std::unique_ptr<flowgraph::ClipToRange> mClipper; 59 std::unique_ptr<flowgraph::MonoToMultiConverter> mChannelConverter; 60 std::unique_ptr<flowgraph::AudioSink> mSink; 61 }; 62 63 64 #endif //ANDROID_AAUDIO_FLOW_GRAPH_H 65
