Add SampleLoader

include/SampleLoader.h

@@ -0,0 +1,47 @@
+/*
+ * SampleLoader.h - Load audio and waveform files
+ *
+ * Copyright (c) saker <sakertooth@gmail.com>
+ *
+ * This file is part of LMMS - https://lmms.io
+ *
+ * This program is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU General Public
+ * License as published by the Free Software Foundation; either
+ * version 2 of the License, or (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+ * General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public
+ * License along with this program (see COPYING); if not, write to the
+ * Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor,
+ * Boston, MA 02110-1301 USA.
+ *
+ */
+
+#ifndef LMMS_SAMPLE_BUFFER_LOADER_H
+#define LMMS_SAMPLE_BUFFER_LOADER_H
+
+#include <QString>
+#include <memory>
+
+#include "SampleBuffer.h"
+#include "lmms_export.h"
+
+namespace lmms::gui {
+class LMMS_EXPORT SampleLoader
+{
+public:
+    static QString openAudioFile(const QString& previousFile = "");
+    static QString openWaveformFile(const QString& previousFile = "");
+	static std::unique_ptr<SampleBuffer> createBufferFromFile(const QString& filePath);
+	static std::unique_ptr<SampleBuffer> createBufferFromBase64(const QString& base64, int sampleRate);
+private:
+    static void displayError(const QString& message);
+};
+} // namespace lmms::gui
+
+#endif // LMMS_SAMPLE_BUFFER_LOADER_H

src/gui/SampleLoader.cpp

@@ -0,0 +1,120 @@
+/*
+ * SampleLoader.cpp - Static functions that open audio files
+ *
+ * Copyright (c) 2005-2014 Tobias Doerffel <tobydox/at/users.sourceforge.net>
+ *
+ * This file is part of LMMS - https://lmms.io
+ *
+ * This program is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU General Public
+ * License as published by the Free Software Foundation; either
+ * version 2 of the License, or (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+ * General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public
+ * License along with this program (see COPYING); if not, write to the
+ * Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor,
+ * Boston, MA 02110-1301 USA.
+ *
+ */
+
+#include "SampleLoader.h"
+
+#include <QFileInfo>
+#include <QMessageBox>
+
+#include "ConfigManager.h"
+#include "FileDialog.h"
+#include "PathUtil.h"
+
+namespace lmms::gui {
+QString SampleLoader::openAudioFile(const QString& previousFile)
+{
+	auto openFileDialog = gui::FileDialog(nullptr, QObject::tr("Open audio file"));
+	auto dir = QString{};
+
+	if (!previousFile.isEmpty())
+	{
+		auto file = QString{previousFile};
+		if (QFileInfo{file}.isRelative())
+		{
+			file = ConfigManager::inst()->userSamplesDir() + file;
+			if (!QFileInfo{file}.exists()) { file = ConfigManager::inst()->factorySamplesDir() + previousFile; }
+		}
+
+		dir = QFileInfo{file}.absolutePath();
+	}
+	else { dir = ConfigManager::inst()->userSamplesDir(); }
+
+	// change dir to position of previously opened file
+	openFileDialog.setDirectory(dir);
+	openFileDialog.setFileMode(gui::FileDialog::ExistingFiles);
+
+	// set filters
+	// TODO: Since libsndfile 1.1.0, MP3 is supported
+	const auto fileTypes = QStringList{QObject::tr("All Audio-Files (*.wav *.ogg *.ds *.flac *.spx *.voc "
+												   "*.aif *.aiff *.au *.raw)"),
+		QObject::tr("Wave-Files (*.wav)"), QObject::tr("OGG-Files (*.ogg)"), QObject::tr("DrumSynth-Files (*.ds)"),
+		QObject::tr("FLAC-Files (*.flac)"), QObject::tr("SPEEX-Files (*.spx)"), QObject::tr("VOC-Files (*.voc)"),
+		QObject::tr("AIFF-Files (*.aif *.aiff)"), QObject::tr("AU-Files (*.au)"), QObject::tr("RAW-Files (*.raw)")};
+
+	openFileDialog.setNameFilters(fileTypes);
+
+	if (!previousFile.isEmpty())
+	{
+		// select previously opened file
+		openFileDialog.selectFile(QFileInfo{previousFile}.fileName());
+	}
+
+	if (openFileDialog.exec() == QDialog::Accepted)
+	{
+		if (openFileDialog.selectedFiles().isEmpty()) { return ""; }
+
+		return PathUtil::toShortestRelative(openFileDialog.selectedFiles()[0]);
+	}
+
+	return "";
+}
+
+QString SampleLoader::openWaveformFile(const QString& previousFile)
+{
+	return openAudioFile(
+		previousFile.isEmpty() ? ConfigManager::inst()->factorySamplesDir() + "waveforms/10saw.flac" : previousFile);
+}
+
+std::unique_ptr<SampleBuffer> SampleLoader::createBufferFromFile(const QString& filePath)
+{
+	try
+	{
+		return std::make_unique<SampleBuffer>(filePath);
+	}
+	catch (const std::runtime_error& error)
+	{
+		displayError(QString::fromStdString(error.what()));
+		return nullptr;
+	}
+}
+
+std::unique_ptr<SampleBuffer> SampleLoader::createBufferFromBase64(const QString& base64, int sampleRate)
+{
+	try
+	{
+		return std::make_unique<SampleBuffer>(base64.toUtf8().toBase64(), sampleRate);
+	}
+	catch (const std::runtime_error& error)
+	{
+		displayError(QString::fromStdString(error.what()));
+		return nullptr;
+	}
+}
+
+void SampleLoader::displayError(const QString& message)
+{
+	QMessageBox::critical(nullptr, QObject::tr("Error loading sample"), message);
+}
+
+} // namespace lmms::gui