1 files changed, 133 insertions, 0 deletions
diff --git a/intern/audaspace/FX/AUD_FaderReader.cpp b/intern/audaspace/FX/AUD_FaderReader.cpp
new file mode 100644
index 00000000000..d5096e7fae1
--- /dev/null
+++ b/intern/audaspace/FX/AUD_FaderReader.cpp
@@ -0,0 +1,133 @@
+/*
+ * $Id$
+ *
+ * ***** 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_FaderReader.h"
+#include "AUD_Buffer.h"
+
+#include <cstring>
+
+AUD_FaderReader::AUD_FaderReader(AUD_IReader* reader, AUD_FadeType type,
+								 float start,float length) :
+		AUD_EffectReader(reader),
+		m_type(type),
+		m_start(start),
+		m_length(length)
+{
+	int bigendian = 1;
+	bigendian = (((char*)&bigendian)[0]) ? 0: 1; // 1 if Big Endian
+
+	switch(m_reader->getSpecs().format)
+	{
+	case AUD_FORMAT_S16:
+		m_adjust = AUD_volume_adjust<int16_t>;
+		break;
+	case AUD_FORMAT_S32:
+		m_adjust = AUD_volume_adjust<int32_t>;
+		break;
+	case AUD_FORMAT_FLOAT32:
+		m_adjust = AUD_volume_adjust<float>;
+		break;
+	case AUD_FORMAT_FLOAT64:
+		m_adjust = AUD_volume_adjust<double>;
+		break;
+	case AUD_FORMAT_U8:
+		m_adjust = AUD_volume_adjust_u8;
+		break;
+	case AUD_FORMAT_S24:
+		m_adjust = bigendian ? AUD_volume_adjust_s24_be :
+							   AUD_volume_adjust_s24_le;
+		break;
+	default:
+		delete m_reader;
+		AUD_THROW(AUD_ERROR_READER);
+	}
+
+	m_buffer = new AUD_Buffer(); AUD_NEW("buffer")
+}
+
+AUD_FaderReader::~AUD_FaderReader()
+{
+	delete m_buffer; AUD_DELETE("buffer")
+}
+
+bool AUD_FaderReader::notify(AUD_Message &message)
+{
+	return m_reader->notify(message);
+}
+
+void AUD_FaderReader::read(int & length, sample_t* & buffer)
+{
+	int position = m_reader->getPosition();
+	AUD_Specs specs = m_reader->getSpecs();
+	int samplesize = AUD_SAMPLE_SIZE(specs);
+
+	m_reader->read(length, buffer);
+
+	if(m_buffer->getSize() < length * samplesize)
+		m_buffer->resize(length * samplesize);
+
+	if((position + length) / (float)specs.rate <= m_start)
+	{
+		if(m_type != AUD_FADE_OUT)
+		{
+			buffer = m_buffer->getBuffer();
+			memset(buffer,
+				   specs.format == AUD_FORMAT_U8 ? 0x80 : 0,
+				   length * samplesize);
+		}
+	}
+	else if(position / (float)specs.rate >= m_start+m_length)
+	{
+		if(m_type == AUD_FADE_OUT)
+		{
+			buffer = m_buffer->getBuffer();
+			memset(buffer,
+				   specs.format == AUD_FORMAT_U8 ? 0x80 : 0,
+				   length * samplesize);
+		}
+	}
+	else
+	{
+		sample_t* buf = m_buffer->getBuffer();
+		float volume;
+
+		for(int i = 0; i < length; i++)
+		{
+			volume = (((position+i)/(float)specs.rate)-m_start) / m_length;
+			if(volume > 1.0f)
+				volume = 1.0f;
+			else if(volume < 0.0f)
+				volume = 0.0f;
+
+			if(m_type == AUD_FADE_OUT)
+				volume = 1.0f - volume;
+
+			m_adjust(buf + i * samplesize, buffer + i * samplesize,
+					 specs.channels, volume);
+		}
+
+		buffer = buf;
+	}
+}