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sound.cpp

/* ScummVM - Scumm Interpreter
 * Copyright (C) 2004 Ivan Dubrov
 * Copyright (C) 2004-2006 The ScummVM project
 *
 * This program is free software; you can redistribute it and/or
 * modify it under the terms of the GNU General Public License
 * as published by the Free Software Foundation; either version 2
 * of the License, or (at your option) any later version.

 * This program 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 General Public License for more details.

 * You should have received a copy of the GNU General Public License
 * along with this program; if not, write to the Free Software
 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
 *
 * $URL: https://svn.sourceforge.net/svnroot/scummvm/scummvm/tags/release-0-9-1/engines/gob/sound.cpp $
 * $Id: sound.cpp 22754 2006-05-29 18:24:52Z drmccoy $
 *
 */

#include "gob/gob.h"
#include "gob/global.h"
#include "gob/sound.h"
#include "gob/game.h"
#include "gob/util.h"

namespace Gob {

void Snd::SquareWaveStream::playNote(int freq, int32 ms, uint rate) {
      _rate = rate;
      _periodLength = _rate / (2 * freq);
      _periodSamples = 0;
      _sampleValue = 6000;
      if (ms == -1) {
            _remainingSamples = 1;
            _beepForever = true;
      } else {
            _remainingSamples = (_rate * ms) / 1000;
            _beepForever = false;
      }
}

int Snd::SquareWaveStream::readBuffer(int16 *buffer, const int numSamples) {
      int samples = 0;

      while (samples < numSamples && _remainingSamples > 0) {
            *buffer++ = _sampleValue;
            if (_periodSamples++ > _periodLength) {
                  _periodSamples = 0;
                  _sampleValue = -_sampleValue;
            }
            samples++;
            if (!_beepForever)
                  _remainingSamples--;
      }

      return samples;
}

Snd::Snd(GobEngine *vm) : _vm(vm) {
      //CleanupFuncPtr cleanupFunc;// = &snd_cleanupFuncCallback();
      _cleanupFunc = 0;
      for (int i = 0; i < ARRAYSIZE(_loopingSounds); i++)
            _loopingSounds[i] = NULL;
      _playingSound = 0;
}

void Snd::loopSounds(void) {
      for (int i = 0; i < ARRAYSIZE(_loopingSounds); i++) {
            SoundDesc *snd = _loopingSounds[i];
            if (snd && !_vm->_mixer->isSoundHandleActive(snd->handle)) {
                  if (snd->repCount-- > 0) {
                        _vm->_mixer->playRaw(&snd->handle, snd->data, snd->size, snd->frequency, 0);
                  } else {
                        _loopingSounds[i] = NULL;
                  }
            }
      }
}

void Snd::setBlasterPort(int16 port) {return;}

void Snd::speakerOn(int16 frequency, int32 length) {
      _speakerStream.playNote(frequency, length, _vm->_mixer->getOutputRate());
      if (!_vm->_mixer->isSoundHandleActive(_speakerHandle)) {
            _vm->_mixer->playInputStream(Audio::Mixer::kSFXSoundType, &_speakerHandle, &_speakerStream, -1, 255, 0, false);
      }
}

void Snd::speakerOff(void) {
      _vm->_mixer->stopHandle(_speakerHandle);
}

void Snd::playSample(Snd::SoundDesc *sndDesc, int16 repCount, int16 frequency) {
      if (frequency == 0)
            frequency = sndDesc->frequency;

      if (frequency <= 0) {
            warning("Attempted to play a sample with a frequency of %d (sndDesc->freq = %d)", frequency, sndDesc->frequency);
            return;
      }
//    assert(frequency > 0);

      if (!_vm->_mixer->isSoundHandleActive(sndDesc->handle)) {
            _vm->_mixer->playRaw(&sndDesc->handle, sndDesc->data, sndDesc->size, frequency, 0);
      }

      sndDesc->repCount = repCount - 1;
      sndDesc->frequency = frequency;

      if (repCount > 1) {
            for (int i = 0; i < ARRAYSIZE(_loopingSounds); i++) {
                  if (!_loopingSounds[i]) {
                        _loopingSounds[i] = sndDesc;
                        return;
                  }
            }
            warning("Looping sounds list is full");
      }
}

void Snd::writeAdlib(int16 port, int16 data) {
      return;
}

Snd::SoundDesc *Snd::loadSoundData(const char *path) {
      Snd::SoundDesc *sndDesc;

      sndDesc = new Snd::SoundDesc;
      sndDesc->size = _vm->_dataio->getDataSize(path);
      sndDesc->data = _vm->_dataio->getData(path);

      return sndDesc;
}

void Snd::freeSoundDesc(Snd::SoundDesc *sndDesc, bool freedata) {
      _vm->_mixer->stopHandle(sndDesc->handle);

      for (int i = 0; i < ARRAYSIZE(_loopingSounds); i++) {
            if (_loopingSounds[i] == sndDesc)
                  _loopingSounds[i] = NULL;
      }

      if (freedata) {
            delete[] sndDesc->data;
      }
      delete sndDesc;
}

}                               // End of namespace Gob




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