1 files changed, 87 insertions, 0 deletions
diff --git a/extern/audaspace/src/fx/DelayReader.cpp b/extern/audaspace/src/fx/DelayReader.cpp
new file mode 100644
index 00000000000..530aed69cba
--- /dev/null
+++ b/extern/audaspace/src/fx/DelayReader.cpp
@@ -0,0 +1,87 @@
+/*******************************************************************************
+ * 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/DelayReader.h"
+
+#include <cstring>
+
+AUD_NAMESPACE_BEGIN
+
+DelayReader::DelayReader(std::shared_ptr<IReader> reader, float delay) :
+	EffectReader(reader),
+	m_delay(int((SampleRate)delay * reader->getSpecs().rate)),
+	m_remdelay(int((SampleRate)delay * reader->getSpecs().rate))
+{
+}
+
+void DelayReader::seek(int position)
+{
+	if(position < m_delay)
+	{
+		m_remdelay = m_delay - position;
+		m_reader->seek(0);
+	}
+	else
+	{
+		m_remdelay = 0;
+		m_reader->seek(position - m_delay);
+	}
+}
+
+int DelayReader::getLength() const
+{
+	int len = m_reader->getLength();
+	if(len < 0)
+		return len;
+	return len + m_delay;
+}
+
+int DelayReader::getPosition() const
+{
+	if(m_remdelay > 0)
+		return m_delay - m_remdelay;
+	return m_reader->getPosition() + m_delay;
+}
+
+void DelayReader::read(int& length, bool& eos, sample_t* buffer)
+{
+	if(m_remdelay > 0)
+	{
+		Specs specs = m_reader->getSpecs();
+		int samplesize = AUD_SAMPLE_SIZE(specs);
+
+		if(length > m_remdelay)
+		{
+			std::memset(buffer, 0, m_remdelay * samplesize);
+
+			int len = length - m_remdelay;
+			m_reader->read(len, eos, buffer + m_remdelay * specs.channels);
+
+			length = m_remdelay + len;
+
+			m_remdelay = 0;
+		}
+		else
+		{
+			std::memset(buffer, 0, length * samplesize);
+			m_remdelay -= length;
+		}
+	}
+	else
+		m_reader->read(length, eos, buffer);
+}
+
+AUD_NAMESPACE_END