1 files changed, 95 insertions, 0 deletions
diff --git a/extern/audaspace/src/sequence/SuperposeReader.cpp b/extern/audaspace/src/sequence/SuperposeReader.cpp
new file mode 100644
index 00000000000..9206a7a96ef
--- /dev/null
+++ b/extern/audaspace/src/sequence/SuperposeReader.cpp
@@ -0,0 +1,95 @@
+/*******************************************************************************
+ * 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 "sequence/SuperposeReader.h"
+#include "Exception.h"
+
+#include <algorithm>
+#include <cstring>
+
+AUD_NAMESPACE_BEGIN
+
+SuperposeReader::SuperposeReader(std::shared_ptr<IReader> reader1, std::shared_ptr<IReader> reader2) :
+	m_reader1(reader1), m_reader2(reader2)
+{
+}
+
+SuperposeReader::~SuperposeReader()
+{
+}
+
+bool SuperposeReader::isSeekable() const
+{
+	return m_reader1->isSeekable() && m_reader2->isSeekable();
+}
+
+void SuperposeReader::seek(int position)
+{
+	m_reader1->seek(position);
+	m_reader2->seek(position);
+}
+
+int SuperposeReader::getLength() const
+{
+	int len1 = m_reader1->getLength();
+	int len2 = m_reader2->getLength();
+	if((len1 < 0) || (len2 < 0))
+		return -1;
+	return std::min(len1, len2);
+}
+
+int SuperposeReader::getPosition() const
+{
+	int pos1 = m_reader1->getPosition();
+	int pos2 = m_reader2->getPosition();
+	return std::max(pos1, pos2);
+}
+
+Specs SuperposeReader::getSpecs() const
+{
+	return m_reader1->getSpecs();
+}
+
+void SuperposeReader::read(int& length, bool& eos, sample_t* buffer)
+{
+	Specs specs = m_reader1->getSpecs();
+	Specs s2 = m_reader2->getSpecs();
+	if(!AUD_COMPARE_SPECS(specs, s2))
+		AUD_THROW(StateException, "Two readers with different specifiactions cannot be superposed.");
+
+	int samplesize = AUD_SAMPLE_SIZE(specs);
+
+	m_buffer.assureSize(length * samplesize);
+
+	int len1 = length;
+	m_reader1->read(len1, eos, buffer);
+
+	if(len1 < length)
+		std::memset(buffer + len1 * specs.channels, 0, (length - len1) * samplesize);
+
+	int len2 = length;
+	bool eos2;
+	sample_t* buf = m_buffer.getBuffer();
+	m_reader2->read(len2, eos2, buf);
+
+	for(int i = 0; i < len2 * specs.channels; i++)
+		buffer[i] += buf[i];
+
+	length = std::max(len1, len2);
+	eos &= eos2;
+}
+
+AUD_NAMESPACE_END