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diff --git a/extern/audaspace/include/respec/SpecsChanger.h b/extern/audaspace/include/respec/SpecsChanger.h
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+++ b/extern/audaspace/include/respec/SpecsChanger.h
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+/*******************************************************************************
+ * Copyright 2009-2016 Jörg Müller
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *   http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ ******************************************************************************/
+
+#pragma once
+
+/**
+ * @file SpecsChanger.h
+ * @ingroup respec
+ * The SpecsChanger class.
+ */
+
+#include "ISound.h"
+#include "respec/Specification.h"
+
+AUD_NAMESPACE_BEGIN
+
+/**
+ * This sound is a base class for all mixer factories.
+ */
+class AUD_API SpecsChanger : public ISound
+{
+protected:
+	/**
+	 * The target specification for resampling.
+	 */
+	const DeviceSpecs m_specs;
+
+	/**
+	 * If there is no reader it is created out of this sound.
+	 */
+	std::shared_ptr<ISound> m_sound;
+
+	/**
+	 * Returns the reader created out of the sound.
+	 * This method can be used for the createReader function of the implementing
+	 * classes.
+	 * \return The reader to mix.
+	 */
+	std::shared_ptr<IReader> getReader() const;
+
+public:
+	/**
+	 * Creates a new sound.
+	 * \param sound The sound to create the readers to mix out of.
+	 * \param specs The target specification.
+	 */
+	SpecsChanger(std::shared_ptr<ISound> sound, DeviceSpecs specs);
+
+	/**
+	 * Returns the target specification for resampling.
+	 */
+	DeviceSpecs getSpecs() const;
+
+	/**
+	 * Returns the saved sound.
+	 * \return The sound.
+	 */
+	std::shared_ptr<ISound> getSound() const;
+};
+
+AUD_NAMESPACE_END