started windows vst support

2019-01-08 16:56:44 +11:00
parent 5f8db6b3be
commit 1f2e491188
7 changed files with 244 additions and 4 deletions
@@ -0,0 +1,185 @@
+#include "vsthostwin.h"
+
+// adapted from http://teragonaudio.com/article/How-to-make-your-own-VST-host.html
+
+#include <Windows.h>
+
+#include <QPushButton>
+
+#include "playback/audio.h"
+#include "mainwindow.h"
+#include "debug.h"
+
+#define BLOCK_SIZE 512
+#define CHANNEL_COUNT 2
+
+// C callbacks
+extern "C" {
+	// Main host callback
+	VstIntPtr VSTCALLBACK hostCallback(AEffect *effect, int opcode, int index, long long value, void *ptr, float opt) {
+		switch(opcode) {
+		case audioMasterVersion:
+			return 2400;
+		case audioMasterIdle:
+			effect->dispatcher(effect, effEditIdle, 0, 0, 0, 0);
+			break;
+		case audioMasterGetCurrentProcessLevel:
+			return 0;
+		// Handle other opcodes here... there will be lots of them
+		default:
+			dout << "[INFO] Plugin requested unhandled opcode" << opcode;
+			break;
+		}
+	}
+}
+
+// Plugin's entry point
+typedef AEffect *(*vstPluginFuncPtr)(audioMasterCallback host);
+// Plugin's getParameter() method
+typedef float (*getParameterFuncPtr)(AEffect *effect, VstInt32 index);
+// Plugin's setParameter() method
+typedef void (*setParameterFuncPtr)(AEffect *effect, VstInt32 index, float value);
+// Plugin's processEvents() method
+typedef VstInt32 (*processEventsFuncPtr)(VstEvents *events);
+// Plugin's process() method
+typedef void (*processFuncPtr)(AEffect *effect, float **inputs, float **outputs, VstInt32 sampleFrames);
+
+void VSTHostWin::loadPlugin() {
+	plugin = NULL;
+
+	const char* vst_path = "C:\\Users\\Matt\\Downloads\\ToneGenerator_Win\\ToneGenerator_64b.dll";
+	wchar_t win_char[200];
+	mbstowcs(win_char, vst_path, 200);
+
+	HMODULE modulePtr = LoadLibrary(win_char);
+	if(modulePtr == NULL) {
+		DWORD dll_err = GetLastError();
+		dout << "[ERROR] Failed to load VST" << vst_path << "-" << dll_err;
+		if (dll_err == 193) dout << "    Mixing 32-bit and 64-bit?";
+		return;
+	}
+
+	vstPluginFuncPtr mainEntryPoint =
+	(vstPluginFuncPtr)GetProcAddress(modulePtr, "VSTPluginMain");
+	// Instantiate the plugin
+	plugin = mainEntryPoint(hostCallback);
+}
+
+int VSTHostWin::configurePluginCallbacks() {
+	// Check plugin's magic number
+	// If incorrect, then the file either was not loaded properly, is not a
+	// real VST plugin, or is otherwise corrupt.
+	if(plugin->magic != kEffectMagic) {
+		printf("Plugin's magic number is bad\n");
+		return -1;
+	}
+
+	// Create dispatcher handle
+	dispatcher = (dispatcherFuncPtr)(plugin->dispatcher);
+
+	// Set up plugin callback functions
+	plugin->getParameter = (getParameterFuncPtr)plugin->getParameter;
+	plugin->processReplacing = (processFuncPtr)plugin->processReplacing;
+	plugin->setParameter = (setParameterFuncPtr)plugin->setParameter;
+
+	//return plugin;
+	return 0;
+}
+
+void VSTHostWin::startPlugin() {
+	dispatcher(plugin, effOpen, 0, 0, NULL, 0.0f);
+
+	// Set some default properties
+	dispatcher(plugin, effSetSampleRate, 0, 0, NULL, current_audio_freq());
+	dispatcher(plugin, effSetBlockSize, 0, BLOCK_SIZE, NULL, 0.0f);
+
+	resumePlugin();
+}
+
+void VSTHostWin::resumePlugin() {
+	dispatcher(plugin, effMainsChanged, 0, 1, NULL, 0.0f);
+}
+
+void VSTHostWin::suspendPlugin() {
+	dispatcher(plugin, effMainsChanged, 0, 0, NULL, 0.0f);
+}
+
+bool VSTHostWin::canPluginDo(char *canDoString) {
+	return (dispatcher(plugin, effCanDo, 0, 0, (void*)canDoString, 0.0f) > 0);
+}
+
+void VSTHostWin::initializeIO() {
+	// inputs and outputs are assumed to be float** and are declared elsewhere,
+	// most likely the are fields owned by this class. numChannels and blocksize
+	// are also fields, both should be size_t (or unsigned int, if you prefer).
+	inputs = new float* [CHANNEL_COUNT];
+	outputs = new float* [CHANNEL_COUNT];
+	for(int channel = 0; channel < CHANNEL_COUNT; channel++) {
+		inputs[channel] = new float[BLOCK_SIZE];
+		outputs[channel] = new float[BLOCK_SIZE];
+	}
+}
+
+void VSTHostWin::processAudio(long numFrames) {
+	// Always reset the output array before processing.
+	silenceChannel(outputs, CHANNEL_COUNT, numFrames);
+
+	plugin->processReplacing(plugin, inputs, outputs, numFrames);
+}
+
+void VSTHostWin::silenceChannel(float **channelData, int numChannels, long numFrames) {
+	for(int channel = 0; channel < numChannels; ++channel) {
+		for(long frame = 0; frame < numFrames; ++frame) {
+		  channelData[channel][frame] = 0.0f;
+		}
+	}
+}
+
+VSTHostWin::VSTHostWin(Clip* c, const EffectMeta *em) : Effect(c, em) {
+	EffectRow* interface_row = add_row("Open Interface");
+	QPushButton* show_interface_btn = new QPushButton();
+	interface_row->add_widget(show_interface_btn);
+	loadPlugin();
+	if (plugin != NULL) {
+		initializeIO();
+		configurePluginCallbacks();
+		startPlugin();
+	}
+}
+
+void VSTHostWin::process_audio(double timecode_start, double timecode_end, quint8* samples, int nb_bytes, int) {
+	if (plugin != NULL) {
+		// convert to floats
+		int nb_frames = qMin(nb_bytes >> 2, BLOCK_SIZE);
+		int lim = qMin(nb_bytes, BLOCK_SIZE << 2);
+		for (int i=0;i<lim;i+=4) {
+			qint16 left_sample = (qint16) (((samples[i+1] & 0xFF) << 8) | (samples[i] & 0xFF));
+			qint16 right_sample = (qint16) (((samples[i+3] & 0xFF) << 8) | (samples[i+2] & 0xFF));
+
+			int index = i >> 2;
+			inputs[0][index] = float(left_sample) / float(INT16_MAX);
+			inputs[1][index] = float(right_sample) / float(INT16_MAX);
+		}
+
+		// send to VST
+		processAudio(nb_frames);
+
+		// convert back to int16
+		for (int i=0;i<nb_frames;i++) {
+			qint16 left_sample = qRound(inputs[0][i]*INT16_MAX);
+			qint16 right_sample = qRound(inputs[1][i]*INT16_MAX);
+
+			int index = i << 2;
+
+			samples[index+3] = (quint8) (right_sample >> 8);
+			samples[index+2] = (quint8) right_sample;
+			samples[index+1] = (quint8) (left_sample >> 8);
+			samples[index] = (quint8) left_sample;
+		}
+	}
+}
+
+void VSTHostWin::show_interface() {
+//	dispatcher(plugin, effEditOpen, 0, 1, NULL, 0.0f);
+//	dispatcher(plugin, effEditOpen, 0, 0, mainWindow->winId());
+}