Logo Search packages:      
Sourcecode: scummvm version File versions  Download package

sound.cpp

/* ScummVM - Scumm Interpreter
 * Copyright (C) 2004 Ivan Dubrov
 * Copyright (C) 2004-2005 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.
 *
 * $Header: /cvsroot/scummvm/scummvm/gob/sound.cpp,v 1.12.2.1 2005/10/18 02:11:18 sev Exp $
 *
 */

#include "sound/audiostream.h"

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

namespace Gob {

// TODO: This is a very primitive square wave generator. The only thing is
//       has in common with the PC speaker is that it sounds terrible.

class SquareWaveStream : public AudioStream {
private:
      uint _rate;
      bool _beepForever;
      uint32 _periodLength;
      uint32 _periodSamples;
      uint32 _remainingSamples;
      int16 _sampleValue;

public:
      SquareWaveStream() {}
      ~SquareWaveStream() {}

      void playNote(int freq, int32 ms);

      int readBuffer(int16 *buffer, const int numSamples);

      bool endOfData() const  { return _remainingSamples == 0; }
      bool isStereo() const   { return false; }
      int getRate() const     { return _rate; }
};

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

int 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;
}

SquareWaveStream speakerStream;
Audio::SoundHandle speakerHandle;
Snd_SoundDesc *snd_loopingSounds[5]; // Should be enough

void snd_initSound(void) {
      for (int i = 0; i < ARRAYSIZE(snd_loopingSounds); i++)
            snd_loopingSounds[i] = NULL;
}

void snd_loopSounds(void) {
      for (int i = 0; i < ARRAYSIZE(snd_loopingSounds); i++) {
            Snd_SoundDesc *snd = 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 {
                        snd_loopingSounds[i] = NULL;
                  }
            }
      }
}

int16 snd_checkProAudio(void) {return 0;}
int16 snd_checkAdlib(void) {return 0;}
int16 snd_checkBlaster(void) {return 0;}
void snd_setBlasterPort(int16 port) {return;}

void snd_speakerOn(int16 frequency, int32 length) {
      speakerStream.playNote(frequency, length);
      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_stopSound(int16 arg){return;}
void snd_setResetTimerFlag(char flag){return;}

void snd_playSample(Snd_SoundDesc *sndDesc, int16 repCount, int16 frequency) {
      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(snd_loopingSounds); i++) {
                  if (!snd_loopingSounds[i]) {
                        snd_loopingSounds[i] = sndDesc;
                        return;
                  }
            }
            warning("Looping sounds list is full");
      }
}

void snd_cleanupFuncCallback() {;}
CleanupFuncPtr (snd_cleanupFunc);
//CleanupFuncPtr snd_cleanupFunc;// = &snd_cleanupFuncCallback();

int16 snd_soundPort;
char snd_playingSound;

void snd_writeAdlib(int16 port, int16 data) {
      return;
}

Snd_SoundDesc *snd_loadSoundData(const char *path) {
      Snd_SoundDesc *sndDesc;
      int32 size;

      size = data_getDataSize(path);
      sndDesc = (Snd_SoundDesc *)malloc(size);
      sndDesc->size = size;
      sndDesc->data = data_getData(path);

      return sndDesc;
}

void snd_freeSoundData(Snd_SoundDesc *sndDesc) {
      _vm->_mixer->stopHandle(sndDesc->handle);

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

      free(sndDesc->data);
      free(sndDesc);
}

void snd_playComposition(Snd_SoundDesc ** samples, int16 *composit, int16 freqVal) {;}
void snd_waitEndPlay(void) {;}

}                               // End of namespace Gob




Generated by  Doxygen 1.6.0   Back to index