1 files changed, 125 insertions, 0 deletions
diff --git a/extern/audaspace/src/fx/BaseIIRFilterReader.cpp b/extern/audaspace/src/fx/BaseIIRFilterReader.cpp
new file mode 100644
index 00000000000..6505e5ea600
--- /dev/null
+++ b/extern/audaspace/src/fx/BaseIIRFilterReader.cpp
@@ -0,0 +1,125 @@
+/*******************************************************************************
+ * 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/BaseIIRFilterReader.h"
+
+#include <cstring>
+
+AUD_NAMESPACE_BEGIN
+
+BaseIIRFilterReader::BaseIIRFilterReader(std::shared_ptr<IReader> reader, int in, int out) :
+	EffectReader(reader),
+	m_specs(reader->getSpecs()),
+	m_xlen(in), m_ylen(out),
+	m_xpos(0), m_ypos(0), m_channel(0)
+{
+	m_x = new sample_t[m_xlen * m_specs.channels];
+	m_y = new sample_t[m_ylen * m_specs.channels];
+
+	std::memset(m_x, 0, sizeof(sample_t) * m_xlen * m_specs.channels);
+	std::memset(m_y, 0, sizeof(sample_t) * m_ylen * m_specs.channels);
+}
+
+BaseIIRFilterReader::~BaseIIRFilterReader()
+{
+	delete[] m_x;
+	delete[] m_y;
+}
+
+void BaseIIRFilterReader::setLengths(int in, int out)
+{
+	if(in != m_xlen)
+	{
+		sample_t* xn = new sample_t[in * m_specs.channels];
+		std::memset(xn, 0, sizeof(sample_t) * in * m_specs.channels);
+
+		for(m_channel = 0; m_channel < m_specs.channels; m_channel++)
+		{
+			for(int i = 1; i <= in && i <= m_xlen; i++)
+			{
+				xn[(in - i) * m_specs.channels + m_channel] = x(-i);
+			}
+		}
+
+		delete[] m_x;
+		m_x = xn;
+		m_xpos = 0;
+		m_xlen = in;
+	}
+
+	if(out != m_ylen)
+	{
+		sample_t* yn = new sample_t[out * m_specs.channels];
+		std::memset(yn, 0, sizeof(sample_t) * out * m_specs.channels);
+
+		for(m_channel = 0; m_channel < m_specs.channels; m_channel++)
+		{
+			for(int i = 1; i <= out && i <= m_ylen; i++)
+			{
+				yn[(out - i) * m_specs.channels + m_channel] = y(-i);
+			}
+		}
+
+		delete[] m_y;
+		m_y = yn;
+		m_ypos = 0;
+		m_ylen = out;
+	}
+}
+
+void BaseIIRFilterReader::read(int& length, bool& eos, sample_t* buffer)
+{
+	Specs specs = m_reader->getSpecs();
+	if(specs.channels != m_specs.channels)
+	{
+		m_specs.channels = specs.channels;
+
+		delete[] m_x;
+		delete[] m_y;
+
+		m_x = new sample_t[m_xlen * m_specs.channels];
+		m_y = new sample_t[m_ylen * m_specs.channels];
+
+		std::memset(m_x, 0, sizeof(sample_t) * m_xlen * m_specs.channels);
+		std::memset(m_y, 0, sizeof(sample_t) * m_ylen * m_specs.channels);
+	}
+
+	if(specs.rate != m_specs.rate)
+	{
+		m_specs = specs;
+		sampleRateChanged(m_specs.rate);
+	}
+
+	m_reader->read(length, eos, buffer);
+
+	for(m_channel = 0; m_channel < m_specs.channels; m_channel++)
+	{
+		for(int i = 0; i < length; i++)
+		{
+			m_x[m_xpos * m_specs.channels + m_channel] = buffer[i * m_specs.channels + m_channel];
+			m_y[m_ypos * m_specs.channels + m_channel] = buffer[i * m_specs.channels + m_channel] = filter();
+
+			m_xpos = m_xlen ? (m_xpos + 1) % m_xlen : 0;
+			m_ypos = m_ylen ? (m_ypos + 1) % m_ylen : 0;
+		}
+	}
+}
+
+void BaseIIRFilterReader::sampleRateChanged(SampleRate rate)
+{
+}
+
+AUD_NAMESPACE_END