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AUD_FaderReader.cpp

/*
 * $Id$
 *
 * ***** 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>

00031 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")
}

00070 AUD_FaderReader::~AUD_FaderReader()
{
      delete m_buffer; AUD_DELETE("buffer")
}

00075 bool AUD_FaderReader::notify(AUD_Message &message)
{
      return m_reader->notify(message);
}

00080 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;
      }
}

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