Add Chromium-only Blender WebEngine parity work

blender-5.2.0/extern/audaspace/src/fx/FaderReader.cpp

@@ -0,0 +1,76 @@
+/*******************************************************************************
+ * 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.
+ ******************************************************************************/
+
+#include "fx/FaderReader.h"
+
+#include <cstring>
+
+AUD_NAMESPACE_BEGIN
+
+FaderReader::FaderReader(std::shared_ptr<IReader> reader, FadeType type, double start, double length) :
+		EffectReader(reader),
+		m_type(type),
+		m_start(start),
+		m_length(length)
+{
+}
+
+void FaderReader::read(int& length, bool& eos, sample_t* buffer)
+{
+	int position = m_reader->getPosition();
+	Specs specs = m_reader->getSpecs();
+	int samplesize = AUD_SAMPLE_SIZE(specs);
+
+	m_reader->read(length, eos, buffer);
+
+	if((position + length) / specs.rate <= m_start)
+	{
+		if(m_type != FADE_OUT)
+		{
+			std::memset(buffer, 0, length * samplesize);
+		}
+	}
+	else if(position / specs.rate >= m_start+m_length)
+	{
+		if(m_type == FADE_OUT)
+		{
+			std::memset(buffer, 0, length * samplesize);
+		}
+	}
+	else
+	{
+		float volume = 1.0f;
+
+		for(int i = 0; i < length * specs.channels; i++)
+		{
+			if(i % specs.channels == 0)
+			{
+				volume = float((((position + i) / specs.rate) - m_start) / m_length);
+				if(volume > 1.0f)
+					volume = 1.0f;
+				else if(volume < 0.0f)
+					volume = 0.0f;
+
+				if(m_type == FADE_OUT)
+					volume = 1.0f - volume;
+			}
+
+			buffer[i] = buffer[i] * volume;
+		}
+	}
+}
+
+AUD_NAMESPACE_END