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/*
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* DISTRHO Plugin Framework (DPF)
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* Copyright (C) 2012-2015 Filipe Coelho <falktx@falktx.com>
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*
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* Permission to use, copy, modify, and/or distribute this software for any purpose with
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* or without fee is hereby granted, provided that the above copyright notice and this
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* permission notice appear in all copies.
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*
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* THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES WITH REGARD
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* TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS. IN
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* NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL
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* DAMAGES OR ANY DAMAGES WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER
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* IN AN ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF OR IN
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* CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
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*/
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#include "DistrhoPlugin.hpp"
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START_NAMESPACE_DISTRHO
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// -----------------------------------------------------------------------------------------------------------
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/**
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Plugin to show how to get some basic information sent to the UI.
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*/
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class LatencyExamplePlugin : public Plugin
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{
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public:
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LatencyExamplePlugin()
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: Plugin(1, 0, 0), // 1 parameter
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fLatency(1.0f),
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fLatencyInFrames(0),
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fBuffer(nullptr),
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fBufferPos(0)
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{
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// allocates buffer
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sampleRateChanged(getSampleRate());
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}
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protected:
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/* --------------------------------------------------------------------------------------------------------
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* Information */
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/**
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Get the plugin label.
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This label is a short restricted name consisting of only _, a-z, A-Z and 0-9 characters.
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*/
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const char* getLabel() const override
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{
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return "Latency";
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}
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/**
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Get the plugin author/maker.
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*/
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const char* getMaker() const override
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{
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return "DISTRHO";
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}
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/**
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Get the plugin license name (a single line of text).
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For commercial plugins this should return some short copyright information.
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*/
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const char* getLicense() const override
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{
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return "ISC";
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}
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/**
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Get the plugin version, in hexadecimal.
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TODO format to be defined
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*/
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uint32_t getVersion() const override
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{
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return 0x1000;
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}
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/**
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Get the plugin unique Id.
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This value is used by LADSPA, DSSI and VST plugin formats.
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*/
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int64_t getUniqueId() const override
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{
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return d_cconst('d', 'L', 'a', 't');
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}
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/* --------------------------------------------------------------------------------------------------------
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* Init */
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/**
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Initialize the parameter @a index.
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This function will be called once, shortly after the plugin is created.
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*/
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void initParameter(uint32_t index, Parameter& parameter) override
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{
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if (index != 0)
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return;
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parameter.hints = kParameterIsAutomable;
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parameter.name = "Latency";
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parameter.symbol = "latency";
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parameter.unit = "s";
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parameter.ranges.def = 1.0f;
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parameter.ranges.min = 0.0f;
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parameter.ranges.max = 5.0f;
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}
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/* --------------------------------------------------------------------------------------------------------
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* Internal data */
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/**
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Get the current value of a parameter.
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The host may call this function from any context, including realtime processing.
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*/
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float getParameterValue(uint32_t index) const override
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{
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if (index != 0)
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return 0.0f;
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return fLatency;
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}
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/**
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Change a parameter value.
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The host may call this function from any context, including realtime processing.
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When a parameter is marked as automable, you must ensure no non-realtime operations are performed.
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@note This function will only be called for parameter inputs.
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*/
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void setParameterValue(uint32_t index, float value) override
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{
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if (index != 0)
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return;
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fLatency = value;
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fLatencyInFrames = value*getSampleRate();
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setLatency(fLatencyInFrames);
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}
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/* --------------------------------------------------------------------------------------------------------
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* Audio/MIDI Processing */
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/**
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Run/process function for plugins without MIDI input.
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@note Some parameters might be null if there are no audio inputs or outputs.
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*/
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void run(const float** inputs, float** outputs, uint32_t frames) override
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{
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const float* const in = inputs[0];
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/* */ float* const out = outputs[0];
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if (fLatencyInFrames == 0)
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{
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if (out != in)
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std::memcpy(out, in, sizeof(float)*frames);
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return;
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}
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// Put the new audio in the buffer.
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std::memcpy(fBuffer+fBufferPos, in, sizeof(float)*frames);
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fBufferPos += frames;
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// buffer is not filled enough yet
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if (fBufferPos < fLatencyInFrames+frames)
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{
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// silence output
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std::memset(out, 0, sizeof(float)*frames);
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}
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// buffer is ready to copy
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else
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{
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// copy latency buffer to output
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const uint32_t readPos = fBufferPos-fLatencyInFrames-frames;
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std::memcpy(out, fBuffer+readPos, sizeof(float)*frames);
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// move latency buffer back by some frames
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std::memmove(fBuffer, fBuffer+frames, sizeof(float)*fBufferPos);
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fBufferPos -= frames;
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}
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}
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/* --------------------------------------------------------------------------------------------------------
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* Callbacks (optional) */
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/**
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Optional callback to inform the plugin about a sample rate change.
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This function will only be called when the plugin is deactivated.
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*/
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void sampleRateChanged(double newSampleRate) override
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{
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if (fBuffer != nullptr)
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delete[] fBuffer;
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const uint32_t maxFrames = newSampleRate*6; // 6 seconds
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fBuffer = new float[maxFrames];
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std::memset(fBuffer, 0, sizeof(float)*maxFrames);
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fLatencyInFrames = fLatency*newSampleRate;
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fBufferPos = 0;
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}
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// -------------------------------------------------------------------------------------------------------
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private:
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// Parameters
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float fLatency;
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uint32_t fLatencyInFrames;
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// Buffer for previous audio, size depends on sample rate
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float* fBuffer;
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uint32_t fBufferPos;
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/**
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Set our plugin class as non-copyable and add a leak detector just in case.
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*/
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DISTRHO_DECLARE_NON_COPYABLE_WITH_LEAK_DETECTOR(LatencyExamplePlugin)
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};
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/* ------------------------------------------------------------------------------------------------------------
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* Plugin entry point, called by DPF to create a new plugin instance. */
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Plugin* createPlugin()
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{
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return new LatencyExamplePlugin();
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}
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// -----------------------------------------------------------------------------------------------------------
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END_NAMESPACE_DISTRHO
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