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AUD_VolumeReader.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_VolumeReader.h"
#include "AUD_Buffer.h"

#include <cstring>

00031 AUD_VolumeReader::AUD_VolumeReader(AUD_IReader* reader, float volume) :
            AUD_EffectReader(reader),
            m_volume(volume)
{
      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")
}

00067 AUD_VolumeReader::~AUD_VolumeReader()
{
      delete m_buffer; AUD_DELETE("buffer")
}

00072 bool AUD_VolumeReader::notify(AUD_Message &message)
{
      if(message.type == AUD_MSG_VOLUME)
      {
            m_volume = message.volume;

            m_reader->notify(message);

            return true;
      }
      return m_reader->notify(message);
}

00085 void AUD_VolumeReader::read(int & length, sample_t* & buffer)
{
      sample_t* buf;
      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();

      m_adjust(buffer, buf, length * specs.channels, m_volume);
}

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