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player_mod.cpp

/* ScummVM - Scumm Interpreter
 * Copyright (C) 2001  Ludvig Strigeus
 * Copyright (C) 2001-2004 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., 59 Temple Place - Suite 330, Boston, MA  02111-1307, USA.
 *
 * $Header: /cvsroot/scummvm/scummvm/scumm/player_mod.cpp,v 2.19 2004/11/28 21:23:53 fingolfin Exp $
 *
 */

#include "stdafx.h"
#include "scumm/player_mod.h"
#include "sound/mixer.h"
#include "sound/rate.h"

namespace Scumm {

Player_MOD::Player_MOD(ScummEngine *scumm) {
      int i;
      _mixer = scumm->_mixer;
      _samplerate = _mixer->getOutputRate();
      _mixamt = 0;
      _mixpos = 0;

      for (i = 0; i < MOD_MAXCHANS; i++) {
            _channels[i].id = 0;
            _channels[i].vol = 0;
            _channels[i].freq = 0;
            _channels[i].converter = NULL;
            _channels[i].input = NULL;
      }

      _playproc = NULL;
      _playparam = NULL;

      _mixer->setupPremix(this);
}

Player_MOD::~Player_MOD() {
      // Detach the premix callback handler
      _mixer->setupPremix(0);
      for (int i = 0; i < MOD_MAXCHANS; i++) {
            if (!_channels[i].id)
                  continue;
            delete _channels[i].converter;
            delete _channels[i].input;
      }
}

void Player_MOD::setMusicVolume(int vol) {
      _maxvol = vol;
}

void Player_MOD::setUpdateProc(ModUpdateProc *proc, void *param, int freq) {
      _playproc = proc;
      _playparam = param;
      _mixamt = _samplerate / freq;
}
void Player_MOD::clearUpdateProc() {
      _playproc = NULL;
      _playparam = NULL;
      _mixamt = 0;
}

void Player_MOD::startChannel(int id, void *data, int size, int rate, uint8 vol, int loopStart, int loopEnd, int8 pan) {
      int i;
      if (id == 0)
            error("player_mod - attempted to start channel id 0");

      for (i = 0; i < MOD_MAXCHANS; i++) {
            if (!_channels[i].id)
                  break;
      }
      if (i == MOD_MAXCHANS) {
            warning("player_mod - too many music channels playing (%i max)",MOD_MAXCHANS);
            return;
      }
      _channels[i].id = id;
      _channels[i].vol = vol;
      _channels[i].pan = pan;
      _channels[i].freq = rate;
      _channels[i].input = makeLinearInputStream(rate, SoundMixer::FLAG_AUTOFREE | (loopStart != loopEnd ? SoundMixer::FLAG_LOOP : 0), (const byte*)data, size, loopStart, loopEnd - loopStart);
      _channels[i].converter = makeRateConverter(rate, _mixer->getOutputRate(), false, false);
}

void Player_MOD::stopChannel(int id) {
      if (id == 0)
            error("player_mod - attempted to stop channel id 0");
      for (int i = 0; i < MOD_MAXCHANS; i++) {
            if (_channels[i].id == id) {
                  delete _channels[i].converter;
                  _channels[i].converter = NULL;
                  delete _channels[i].input;
                  _channels[i].input = NULL;
                  _channels[i].id = 0;
                  _channels[i].vol = 0;
                  _channels[i].freq = 0;
            }
      }
}
void Player_MOD::setChannelVol(int id, uint8 vol) {
      if (id == 0)
            error("player_mod - attempted to set volume for channel id 0");
      for (int i = 0; i < MOD_MAXCHANS; i++) {
            if (_channels[i].id == id) {
                  _channels[i].vol = vol;
                  break;
            }
      }
}

void Player_MOD::setChannelPan(int id, int8 pan) {
      if (id == 0)
            error("player_mod - attempted to set pan for channel id 0");
      for (int i = 0; i < MOD_MAXCHANS; i++) {
            if (_channels[i].id == id) {
                  _channels[i].pan = pan;
                  break;
            }
      }
}

void Player_MOD::setChannelFreq(int id, int freq) {
      if (id == 0)
            error("player_mod - attempted to set frequency for channel id 0");
      for (int i = 0; i < MOD_MAXCHANS; i++) {
            if (_channels[i].id == id) {
                  _channels[i].freq = freq;
                  delete _channels[i].converter;
                  _channels[i].converter = makeRateConverter(freq, _mixer->getOutputRate(), false, false);
                  break;
            }
      }
}

void Player_MOD::do_mix(int16 *data, uint len) {
      int i;
      int dpos = 0;
      uint dlen = 0;
      memset(data, 0, 2 * len * sizeof(int16));
      while (len) {
            if (_playproc) {
                  dlen = _mixamt - _mixpos;
                  if (!_mixpos)
                        _playproc(_playparam);
                  if (dlen <= len) {
                        _mixpos = 0;
                        len -= dlen;
                  } else {
                        _mixpos = _mixamt - len;
                        dlen = len;
                        len = 0;
                  }
            } else {
                  dlen = len;
                  len = 0;
            }
            for (i = 0; i < MOD_MAXCHANS; i++)
                  if (_channels[i].id) {
                        st_volume_t vol_l = (127 - _channels[i].pan) * _channels[i].vol / 127;
                        st_volume_t vol_r = (127 + _channels[i].pan) * _channels[i].vol / 127;
                        _channels[i].converter->flow(*_channels[i].input, &data[dpos*2], dlen, vol_l, vol_r);
                  }
            dpos += dlen;
      }
}

} // End of namespace Scumm

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