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/*
* Copyright 2015 The Android Open Source Project
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
#ifndef FLOWGRAPH_RAMP_LINEAR_H
#define FLOWGRAPH_RAMP_LINEAR_H
#include <atomic>
#include <unistd.h>
#include <sys/types.h>
#include "AudioProcessorBase.h"
namespace flowgraph {
class RampLinear : public AudioProcessorBase {
public:
explicit RampLinear(int32_t channelCount);
virtual ~RampLinear() = default;
int32_t onProcess(int64_t framePosition, int32_t numFrames) override;
/**
* This is used for the next ramp.
* Calling this does not affect a ramp that is in progress.
*/
void setLengthInFrames(int32_t frames);
int32_t getLengthInFrames() const {
return mLengthInFrames;
}
/**
* This may be safely called by another thread.
* @param target
*/
void setTarget(float target);
float getTarget() const {
return mTarget.load();
}
/**
* Force the nextSegment to start from this level.
*
* WARNING: this can cause a discontinuity if called while the ramp is being used.
* Only call this when setting the initial ramp.
*
* @param level
*/
void forceCurrent(float level) {
mLevelFrom = level;
mLevelTo = level;
}
AudioFloatInputPort input;
AudioFloatOutputPort output;
private:
float interpolateCurrent();
std::atomic<float> mTarget;
int32_t mLengthInFrames = 48000.0f / 100.0f ; // 10 msec at 48000 Hz;
int32_t mRemaining = 0;
float mScaler = 0.0f;
float mLevelFrom = 0.0f;
float mLevelTo = 0.0f;
};
} /* namespace flowgraph */
#endif //FLOWGRAPH_RAMP_LINEAR_H