gearmulator

commit f8843247b181d93f77095cbc994fda11feb7ccd7
parent 32df65f65e3b9f57fffc7d94d39e19cf2c290704
Author: dsp56300 <dsp56300@users.noreply.github.com>
Date:   Sat, 28 Sep 2024 02:13:05 +0200

add helper class to export preset banks as lv2 presets

Diffstat:
M
source/synthLib/CMakeLists.txt
 | 
1
+
A
source/synthLib/lv2PresetExport.cpp
 | 
189
+++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
A
source/synthLib/lv2PresetExport.h
 | 
29
+++++++++++++++++++++++++++++

3 files changed, 219 insertions(+), 0 deletions(-)
diff --git a/source/synthLib/CMakeLists.txt b/source/synthLib/CMakeLists.txt
@@ -15,6 +15,7 @@ set(SOURCES
 	deviceException.cpp deviceException.h
 	deviceTypes.h
 	dspMemoryPatch.cpp dspMemoryPatch.h
+	lv2PresetExport.cpp lv2PresetExport.h
 	midiBufferParser.cpp midiBufferParser.h
 	midiClock.cpp midiClock.h
 	midiToSysex.cpp midiToSysex.h
diff --git a/source/synthLib/lv2PresetExport.cpp b/source/synthLib/lv2PresetExport.cpp
@@ -0,0 +1,189 @@
+#include "lv2PresetExport.h"
+
+#include <fstream>
+#include <map>
+
+#include "os.h"
+
+namespace synthLib
+{
+	namespace
+	{
+		const std::string g_keyBankName = "%BANKNAME%";
+		const std::string g_keyBankId = "%BANKID%";
+		const std::string g_keyPluginId = "%PLUGINID%";
+		const std::string g_keyPresetFilename = "%PRESETFILENAME%";
+		const std::string g_keyPresetName = "%PRESETNAME%";
+		const std::string g_keyPresetData = "%PRESETDATA%";
+
+		const std::string g_manifestHeader =
+			"@prefix atom: <http://lv2plug.in/ns/ext/atom#> .\n"
+			"@prefix lv2: <http://lv2plug.in/ns/lv2core#> .\n"
+			"@prefix pset: <http://lv2plug.in/ns/ext/presets#> .\n"
+			"@prefix rdf: <http://www.w3.org/1999/02/22-rdf-syntax-ns#> .\n"
+			"@prefix rdfs: <http://www.w3.org/2000/01/rdf-schema#> .\n"
+			"@prefix state: <http://lv2plug.in/ns/ext/state#> .\n"
+			"@prefix xsd: <http://www.w3.org/2001/XMLSchema#> .\n"
+			"\n";
+
+		const std::string g_manifestBankEntry =
+			"<" + g_keyBankId + ">\n"
+			"	lv2:appliesTo <" + g_keyPluginId + "> ;\n"
+			"	a pset:Bank ;\n"
+			"	rdfs:label \"" + g_keyBankName + "\" .\n"
+			"\n";
+
+		const std::string g_manifestPresetEntry =
+		"<" + g_keyPresetFilename + ">\n"
+		"	lv2:appliesTo <" + g_keyPluginId + "> ;\n"
+		"	a pset:Preset ;\n"
+		"	pset:bank <" + g_keyBankId + "> ;\n"
+		"	rdfs:seeAlso <" + g_keyPresetFilename + "> .\n"
+		"\n";
+
+		const std::string g_presetFile = 
+			"@prefix atom: <http://lv2plug.in/ns/ext/atom#> .\n"
+			"@prefix lv2: <http://lv2plug.in/ns/lv2core#> .\n"
+			"@prefix pset: <http://lv2plug.in/ns/ext/presets#> .\n"
+			"@prefix rdf: <http://www.w3.org/1999/02/22-rdf-syntax-ns#> .\n"
+			"@prefix rdfs: <http://www.w3.org/2000/01/rdf-schema#> .\n"
+			"@prefix state: <http://lv2plug.in/ns/ext/state#> .\n"
+			"@prefix xsd: <http://www.w3.org/2001/XMLSchema#> .\n"
+			"\n"
+			"<>\n"
+			"	a pset:Preset ;\n"
+			"	lv2:appliesTo <" + g_keyPluginId + "> ;\n"
+			"	rdfs:label \"" + g_keyPresetName + "\" ;\n"
+			"	state:state [\n"
+			"		<" + g_keyPluginId + ":StateString> \"" + g_keyPresetData + "\"\n"
+			"	] .\n"
+			"\n";
+
+		std::string toFilename(std::string _name)
+		{
+			for (char& c : _name)
+			{
+				if ((c >= '0' && c <= '9') || (c >= 'A' && c <= 'Z') || (c >= 'a' && c <= 'z'))
+					continue;
+				c = '_';
+			}
+			return _name;
+		}
+
+		std::string replaceVariables(std::string _string, const std::map<std::string, std::string>& _variables)
+		{
+			for (const auto& [key, value] : _variables)
+			{
+				while(true)
+				{
+					const auto pos = _string.find(key);
+					if(pos == std::string::npos)
+						break;
+					_string.erase(pos, key.size());
+					_string.insert(pos, value);
+				}
+			}
+			return _string;
+		}
+
+		int getBitRange (const std::vector<uint8_t>& _data, size_t bitRangeStart, size_t numBits)
+		{
+		    int res = 0;
+
+		    auto byte = bitRangeStart >> 3;
+		    auto offsetInByte = bitRangeStart & 7;
+		    size_t bitsSoFar = 0;
+
+		    while (numBits > 0 && (size_t) byte < _data.size())
+		    {
+			    const auto bitsThisTime = std::min(numBits, 8 - offsetInByte);
+		        const int mask = (0xff >> (8 - bitsThisTime)) << offsetInByte;
+
+		        res |= (((_data[byte] & mask) >> offsetInByte) << bitsSoFar);
+
+		        bitsSoFar += bitsThisTime;
+		        numBits -= bitsThisTime;
+		        ++byte;
+		        offsetInByte = 0;
+		    }
+
+		    return res;
+		}
+
+		constexpr char base64EncodingTable[] = ".ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789+";
+
+		std::string dataToJuceEncodedString(const std::vector<uint8_t>& _data)
+		{
+		    const auto numChars = ((_data.size() << 3) + 5) / 6;
+
+			// store the length, followed by a '.', and then the data
+		    std::string destString = std::to_string(numChars);
+			destString.reserve(_data.size());
+
+		    const auto initialLen = destString.size();
+		    destString.reserve(initialLen + 2 + numChars);
+
+			destString.push_back('.');
+
+			for (size_t i = 0; i < numChars; ++i)
+				destString.push_back(base64EncodingTable[getBitRange (_data, i * 6, 6)]);
+
+			return destString;
+		}
+	}
+
+	bool Lv2PresetExport::exportPresets(const std::string& _outputPath, const std::string& _pluginId, const std::vector<Bank>& _banks)
+	{
+		const auto path = validatePath(_outputPath);
+		createDirectory(path);
+
+		for (const auto& bank : _banks)
+		{
+			if(!exportPresets(path + toFilename(bank.name) + ".lv2/", _pluginId, bank))
+				return false;
+		}
+		return true;
+	}
+
+	bool Lv2PresetExport::exportPresets(const std::string& _outputPath, const std::string& _pluginId, const Bank& _bank)
+	{
+		const auto path = validatePath(_outputPath);
+		createDirectory(path);
+		std::ofstream manifest(path + "manifest.ttl");
+		if(!manifest.is_open())
+			return false;
+
+		std::map<std::string, std::string> bankVars;
+
+		bankVars.insert({g_keyPluginId, _pluginId});
+		bankVars.insert({g_keyBankId, toFilename(_bank.name)});
+		bankVars.insert({g_keyBankName, _bank.name});
+
+		manifest << replaceVariables(g_manifestHeader, bankVars);
+		manifest << replaceVariables(g_manifestBankEntry, bankVars);
+
+		for (const auto& preset : _bank.presets)
+		{
+			const auto presetFilename = toFilename(preset.name) + ".ttl";
+
+			auto presetVars = bankVars;
+
+			presetVars.insert({g_keyPresetName, preset.name});
+			presetVars.insert({g_keyPresetFilename, presetFilename});
+			presetVars.insert({g_keyPresetData, dataToJuceEncodedString(preset.data)});
+
+			std::ofstream presetFile(path + presetFilename);
+
+			if(!presetFile.is_open())
+				return false;
+
+			manifest << replaceVariables(g_manifestPresetEntry, presetVars);
+
+			presetFile << replaceVariables(g_presetFile, presetVars);
+
+			presetFile.close();
+		}
+
+		return true;
+	}
+}
diff --git a/source/synthLib/lv2PresetExport.h b/source/synthLib/lv2PresetExport.h
@@ -0,0 +1,29 @@
+#pragma once
+
+#include <cstdint>
+#include <string>
+#include <vector>
+
+namespace synthLib
+{
+	class Lv2PresetExport
+	{
+	public:
+		using PresetData = std::vector<uint8_t>;
+
+		struct Preset
+		{
+			std::string name;
+			PresetData data;
+		};
+
+		struct Bank
+		{
+			std::string name;
+			std::vector<Preset> presets;
+		};
+
+		static bool exportPresets(const std::string& _outputPath, const std::string& _pluginId, const std::vector<Bank>& _banks);
+		static bool exportPresets(const std::string& _outputPath, const std::string& _pluginId, const Bank& _bank);
+	};
+}