Add Chromium-only Blender WebEngine parity work

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

@@ -0,0 +1,91 @@
+/*******************************************************************************
+ * 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/LoopReader.h"
+
+#include <cstring>
+
+AUD_NAMESPACE_BEGIN
+
+LoopReader::LoopReader(std::shared_ptr<IReader> reader, int loop) :
+		EffectReader(reader), m_count(loop), m_left(loop)
+{
+}
+
+void LoopReader::seek(int position)
+{
+	int len = m_reader->getLength();
+	if(len < 0)
+		m_reader->seek(position);
+	else
+	{
+		if(m_count >= 0)
+		{
+			m_left = m_count - (position / len);
+			if(m_left < 0)
+				m_left = 0;
+		}
+		m_reader->seek(position % len);
+	}
+}
+
+int LoopReader::getLength() const
+{
+	if(m_count < 0)
+		return -1;
+	return m_reader->getLength() * m_count;
+}
+
+int LoopReader::getPosition() const
+{
+	return m_reader->getPosition() * (m_count < 0 ? 1 : m_count);
+}
+
+void LoopReader::read(int& length, bool& eos, sample_t* buffer)
+{
+	const Specs specs = m_reader->getSpecs();
+
+	int len = length;
+
+	m_reader->read(length, eos, buffer);
+
+	if(length < len && eos && m_left)
+	{
+		int pos = length;
+		length = len;
+
+		while(pos < length && eos && m_left)
+		{
+			if(m_left > 0)
+				m_left--;
+
+			m_reader->seek(0);
+
+			len = length - pos;
+			m_reader->read(len, eos, buffer + pos * specs.channels);
+
+			// prevent endless loop
+			if(!len)
+				break;
+
+			pos += len;
+		}
+
+		length = pos;
+	}
+}
+
+AUD_NAMESPACE_END