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- /*
- ==============================================================================
-
- This file is part of the JUCE 6 technical preview.
- Copyright (c) 2020 - Raw Material Software Limited
-
- You may use this code under the terms of the GPL v3
- (see www.gnu.org/licenses).
-
- For this technical preview, this file is not subject to commercial licensing.
-
- JUCE IS PROVIDED "AS IS" WITHOUT ANY WARRANTY, AND ALL WARRANTIES, WHETHER
- EXPRESSED OR IMPLIED, INCLUDING MERCHANTABILITY AND FITNESS FOR PURPOSE, ARE
- DISCLAIMED.
-
- ==============================================================================
- */
-
- namespace juce
- {
- namespace dsp
- {
-
- enum class PannerRule
- {
- linear,
- balanced,
- sin3dB,
- sin4p5dB,
- sin6dB,
- squareRoot3dB,
- squareRoot4p5dB
- };
-
- /**
- A processor to perform panning operations on stereo buffers.
-
- @tags{DSP}
- */
- template <typename SampleType>
- class Panner
- {
- public:
- //==============================================================================
- using Rule = PannerRule;
-
- //==============================================================================
- /** Constructor. */
- Panner();
-
- //==============================================================================
- /** Sets the panning rule. */
- void setRule (Rule newRule);
-
- /** Sets the current panning value, between -1 (full left) and 1 (full right). */
- void setPan (SampleType newPan);
-
- //==============================================================================
- /** Initialises the processor. */
- void prepare (const ProcessSpec& spec);
-
- /** Resets the internal state variables of the processor. */
- void reset();
-
- //==============================================================================
- /** Processes the input and output samples supplied in the processing context. */
- template <typename ProcessContext>
- void process (const ProcessContext& context) noexcept
- {
- const auto& inputBlock = context.getInputBlock();
- auto& outputBlock = context.getOutputBlock();
-
- const auto numInputChannels = inputBlock.getNumChannels();
- const auto numOutputChannels = outputBlock.getNumChannels();
- const auto numSamples = outputBlock.getNumSamples();
-
- jassert (inputBlock.getNumSamples() == numSamples);
- ignoreUnused (numSamples);
-
- if (numOutputChannels != 2 || numInputChannels == 0 || numInputChannels > 2)
- return;
-
- if (numInputChannels == 2)
- {
- outputBlock.copyFrom (inputBlock);
- }
- else
- {
- outputBlock.getSingleChannelBlock (0).copyFrom (inputBlock);
- outputBlock.getSingleChannelBlock (1).copyFrom (inputBlock);
- }
-
- if (context.isBypassed)
- return;
-
- outputBlock.getSingleChannelBlock (0).multiplyBy (leftVolume);
- outputBlock.getSingleChannelBlock (1).multiplyBy (rightVolume);
- }
-
- private:
- //==============================================================================
- void update();
-
- //==============================================================================
- Rule currentRule = Rule::balanced;
- SampleType pan = 0.0;
- SmoothedValue<SampleType> leftVolume, rightVolume;
- double sampleRate = 44100.0;
- };
-
- } // namespace dsp
- } // namespace juce
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