1 files changed, 111 insertions, 0 deletions
diff --git a/intern/audaspace/FX/AUD_ReverseReader.cpp b/intern/audaspace/FX/AUD_ReverseReader.cpp
new file mode 100644
index 00000000000..043480b91b9
--- /dev/null
+++ b/intern/audaspace/FX/AUD_ReverseReader.cpp
@@ -0,0 +1,111 @@
+/*
+ * $Id$
+ *
+ * ***** BEGIN LGPL LICENSE BLOCK *****
+ *
+ * Copyright 2009 Jörg Hermann Müller
+ *
+ * This file is part of AudaSpace.
+ *
+ * AudaSpace is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU Lesser General Public License as published by
+ * the Free Software Foundation, either version 3 of the License, or
+ * (at your option) any later version.
+ *
+ * AudaSpace is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU Lesser General Public License for more details.
+ *
+ * You should have received a copy of the GNU Lesser General Public License
+ * along with AudaSpace.  If not, see <http://www.gnu.org/licenses/>.
+ *
+ * ***** END LGPL LICENSE BLOCK *****
+ */
+
+#include "AUD_ReverseReader.h"
+#include "AUD_Buffer.h"
+
+#include <cstring>
+
+AUD_ReverseReader::AUD_ReverseReader(AUD_IReader* reader) :
+		AUD_EffectReader(reader)
+{
+	if(reader->getType() != AUD_TYPE_BUFFER)
+		AUD_THROW(AUD_ERROR_READER);
+
+	m_length = reader->getLength();
+	if(m_length < 0)
+		AUD_THROW(AUD_ERROR_READER);
+
+	m_position = 0;
+	m_buffer = new AUD_Buffer(); AUD_NEW("buffer")
+}
+
+AUD_ReverseReader::~AUD_ReverseReader()
+{
+	delete m_buffer; AUD_DELETE("buffer")
+}
+
+void AUD_ReverseReader::seek(int position)
+{
+	m_position = position;
+}
+
+int AUD_ReverseReader::getLength()
+{
+	return m_length;
+}
+
+int AUD_ReverseReader::getPosition()
+{
+	return m_position;
+}
+
+void AUD_ReverseReader::read(int & length, sample_t* & buffer)
+{
+	// first correct the length
+	if(m_position+length > m_length)
+		length = m_length-m_position;
+
+	if(length <= 0)
+	{
+		length = 0;
+		return;
+	}
+
+	int samplesize = AUD_SAMPLE_SIZE(getSpecs());
+
+	// resize buffer if needed
+	if(m_buffer->getSize() < length * samplesize)
+		m_buffer->resize(length * samplesize);
+
+	buffer = m_buffer->getBuffer();
+
+	sample_t* buf;
+	int len = length;
+
+	// read from reader
+	m_reader->seek(m_length-m_position-len);
+	m_reader->read(len, buf);
+
+	// set null if reader didn't give enough data
+	if(len < length)
+	{
+		if(getSpecs().format == AUD_FORMAT_U8)
+			memset(buffer, 0x80, (length-len)*samplesize);
+		else
+			memset(buffer, 0, (length-len)*samplesize);
+		buffer += length-len;
+	}
+
+	// copy the samples reverted
+	for(int i = 0; i < len; i++)
+		memcpy(buffer + i * samplesize,
+			   buf + (len - 1 - i) * samplesize,
+			   samplesize);
+
+	m_position += length;
+
+	buffer = m_buffer->getBuffer();
+}