vst2sdk

A clean room reverse engineering project for the VST 2.x interface
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audioeffect.cpp (5918B)

      1 /*
      2  * Copyright 2024 Michael Fabian 'Xaymar' Dirks <info@xaymar.com>
      3  * Copyright 2024 Steinberg Media Technologies GmbH
      4  *
      5  * Redistribution and use in source and binary forms, with or without modification, are permitted provided that the following conditions are met:
      6  *
      7  * 1. Redistributions of source code must retain the above copyright notice, this list of conditions and the following disclaimer.
      8  *
      9  * 2. Redistributions in binary form must reproduce the above copyright notice, this list of conditions and the following disclaimer in the documentation and/or other materials provided with the distribution.
     10  *
     11  * 3. Neither the name of the copyright holder nor the names of its contributors may be used to endorse or promote products derived from this software without specific prior written permission.
     12  *
     13  * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
     14  */
     15 
     16 #include "audioeffect.hpp"
     17 #include <cstring>
     18 #include "aeffect.h"
     19 
     20 #define FOURCC(a, b, c, d) ((a << 24) | (b << 16) | (c << 8) | d)
     21 
     22 AudioEffect::AudioEffect(audioMasterCallback p_audioMaster, VstInt32 __unk00, VstInt32 __unk01)
     23 {
     24 	memset(&cEffect, 0, sizeof(AEffect));
     25 	cEffect.magic       = FOURCC('V', 's', 't', 'P');
     26 	cEffect.effect_data = this;
     27 #if (!defined VST_VERSION_SUPPORT)
     28 	cEffect.version = kVstVersion_2400;
     29 #else
     30 	cEffect.version = VST_VERSION_SUPPORT;
     31 #endif
     32 	cEffect.control          = [](AEffect* self, VstInt32 opcode, VstInt32 param1, VstIntPtr param2, void* ptr, float value) { return reinterpret_cast<AudioEffect*>(self->effect_data)->control(opcode, param1, param2, ptr, value); };
     33 	cEffect.process          = [](AEffect* self, float** inputs, float** outputs, VstInt32 sampleFrames) { return reinterpret_cast<AudioEffect*>(self->effect_data)->process(inputs, outputs, sampleFrames); };
     34 	cEffect.setParameter     = [](AEffect* self, VstInt32 index, float value) { reinterpret_cast<AudioEffect*>(self->effect_data)->setParameter(index, value); };
     35 	cEffect.getParameter     = [](AEffect* self, VstInt32 index) { return reinterpret_cast<AudioEffect*>(self->effect_data)->getParameter(index); };
     36 	cEffect.processReplacing = [](AEffect* self, float** inputs, float** outputs, VstInt32 sampleFrames) { return reinterpret_cast<AudioEffect*>(self->effect_data)->processReplacing(inputs, outputs, sampleFrames); };
     37 
     38 	audioMaster = p_audioMaster;
     39 	numPrograms = cEffect.numPrograms;
     40 	curProgram  = 0;
     41 	editor      = nullptr;
     42 }
     43 
     44 AudioEffect::~AudioEffect() {}
     45 
     46 VstIntPtr AudioEffect::control(VstInt32 opcode, VstInt32 param1, VstIntPtr param2, void* ptr, float value)
     47 {
     48 	switch (opcode) {
     49 	case audioEffectOpen:
     50 		open();
     51 		break;
     52 	case audioEffectClose:
     53 		close();
     54 		break;
     55 	case audioEffectSetProgram:
     56 		setProgram(param1);
     57 		break;
     58 	case audioEffectGetProgram:
     59 		return getProgram();
     60 	case audioEffectSetProgramName:
     61 		setProgramName((char*)ptr);
     62 		break;
     63 	case audioEffectGetProgramName:
     64 		getProgramName((char*)ptr);
     65 		break;
     66 	case audioEffectGetParameterLabel:
     67 		getParameterLabel(param1, (char*)ptr);
     68 		break;
     69 	case audioEffectGetParameterDisplay:
     70 		getParameterDisplay(param1, (char*)ptr);
     71 		break;
     72 	case audioEffectGetParameterName:
     73 		getParameterName(param1, (char*)ptr);
     74 		break;
     75 	case audioEffectSetSampleRate:
     76 		setSampleRate(value);
     77 		break;
     78 	case audioEffectSetBlockSize:
     79 		setBlockSize(static_cast<VstInt32>(value));
     80 		break;
     81 	case audioEffectSuspendResume:
     82 		if (!param2) {
     83 			suspend();
     84 		} else {
     85 			resume();
     86 		}
     87 		break;
     88 	case audioEffectEditorGetSize:
     89 		if (editor) {
     90 			return editor->getRect((ERect**)ptr) ? 1 : 0;
     91 		}
     92 		break;
     93 	case audioEffectEditorOpen:
     94 		if (editor) {
     95 			return editor->open(ptr);
     96 		}
     97 		break;
     98 	case audioEffectEditorClose:
     99 		if (editor) {
    100 			editor->close();
    101 		}
    102 		break;
    103 	case audioEffectEditorDoNothing: // Occasionally appears. Does nothing? Only called when editor is open.
    104 		if (editor) {
    105 			editor->do_nothing();
    106 		}
    107 		break;
    108 	case audioEffectGetChunk:
    109 		return getChunk((void**)ptr, !!param1);
    110 	case audioEffectSetChunk:
    111 		return setChunk(ptr, static_cast<VstInt32>(value), !!param1);
    112 	default:
    113 		break;
    114 	}
    115 	return 0;
    116 }
    117 
    118 AEffect* AudioEffect::getAeffect()
    119 {
    120 	return &cEffect;
    121 }
    122 
    123 void AudioEffect::setEditor(AEffEditor* p_editor)
    124 {
    125 	editor = p_editor;
    126 }
    127 
    128 void AudioEffect::setUniqueID(VstInt32 uniqueID)
    129 {
    130 	cEffect.uniqueID = uniqueID;
    131 }
    132 
    133 void AudioEffect::setNumInputs(VstInt32 numInputs)
    134 {
    135 	cEffect.numInputs = numInputs;
    136 }
    137 
    138 void AudioEffect::setNumOutputs(VstInt32 numOutputs)
    139 {
    140 	cEffect.numOutputs = numOutputs;
    141 }
    142 
    143 void AudioEffect::setInitialDelay(VstInt32 delay)
    144 {
    145 	cEffect.delay = delay;
    146 }
    147 
    148 void AudioEffect::canProcessReplacing(bool value)
    149 {
    150 	if (value)
    151 		cEffect.flags |= AEffectFlagCanReplacing;
    152 	else
    153 		cEffect.flags &= ~AEffectFlagCanReplacing;
    154 }
    155 
    156 void AudioEffect::isSynth(bool value)
    157 {
    158 	if (value)
    159 		cEffect.flags |= AEffectFlagIsSynthesizer;
    160 	else
    161 		cEffect.flags &= ~AEffectFlagIsSynthesizer;
    162 }
    163 
    164 void AudioEffect::programsAreChunks(bool value)
    165 {
    166 	if (value)
    167 		cEffect.flags |= AEffectFlagProgramsAreChunks;
    168 	else
    169 		cEffect.flags &= ~AEffectFlagProgramsAreChunks;
    170 }
    171 
    172 void AudioEffect::setParameterAutomated(VstInt32 index, float value)
    173 {
    174 	setParameter(index, value);
    175 	if (audioMaster)
    176 		audioMaster(getAeffect(), audioMasterAutomate, index, 0, 0, value);
    177 }