1 files changed, 86 insertions, 0 deletions
diff --git a/intern/audaspace/FX/AUD_EnvelopeReader.cpp b/intern/audaspace/FX/AUD_EnvelopeReader.cpp
new file mode 100644
index 00000000000..f41aee1d4bc
--- /dev/null
+++ b/intern/audaspace/FX/AUD_EnvelopeReader.cpp
@@ -0,0 +1,86 @@
+/*
+ * $Id$
+ *
+ * ***** 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_EnvelopeReader.h"
+#include "AUD_Buffer.h"
+
+#include <cstring>
+#include <cmath>
+
+AUD_EnvelopeReader::AUD_EnvelopeReader(AUD_IReader* reader, float attack,
+									   float release, float threshold,
+									   float arthreshold) :
+		AUD_EffectReader(reader),
+		m_threshold(threshold)
+{
+	AUD_Specs specs = reader->getSpecs();
+	int samplesize = AUD_SAMPLE_SIZE(specs);
+
+	m_buffer = new AUD_Buffer(); AUD_NEW("buffer")
+
+	m_envelopes = new AUD_Buffer(samplesize);
+	AUD_NEW("buffer")
+	memset(m_envelopes->getBuffer(), 0, samplesize);
+
+	m_bAttack = pow(arthreshold, 1.0/(specs.rate * attack));
+	m_bRelease = pow(arthreshold, 1.0/(specs.rate * release));
+}
+
+AUD_EnvelopeReader::~AUD_EnvelopeReader()
+{
+	delete m_buffer; AUD_DELETE("buffer")
+	delete m_envelopes; AUD_DELETE("buffer")
+}
+
+void AUD_EnvelopeReader::read(int & length, sample_t* & buffer)
+{
+	sample_t* buf;
+	sample_t* envelopes;
+	envelopes = m_envelopes->getBuffer();
+
+	AUD_Specs specs = m_reader->getSpecs();
+
+	m_reader->read(length, buf);
+	if(m_buffer->getSize() < length * AUD_SAMPLE_SIZE(specs))
+		m_buffer->resize(length * AUD_SAMPLE_SIZE(specs));
+
+	buffer = m_buffer->getBuffer();
+
+	sample_t value;
+
+	for(int channel = 0; channel < specs.channels; channel++)
+	{
+		for(int i = 0; i < length; i++)
+		{
+			value = fabs(buf[i * specs.channels + channel]);
+			if(value < m_threshold)
+				value = 0.0f;
+
+			buffer[i * specs.channels + channel] = envelopes[channel] =
+				((value > envelopes[channel]) ? m_bAttack : m_bRelease) *
+				 (envelopes[channel] - value) + value;
+		}
+	}
+}