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fluidsynth.cpp

/* ScummVM - Graphic Adventure Engine
 *
 * ScummVM is the legal property of its developers, whose names
 * are too numerous to list here. Please refer to the COPYRIGHT
 * file distributed with this source distribution.
 *
 * 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://scummvm.svn.sourceforge.net/svnroot/scummvm/scummvm/tags/release-0-11-1/sound/softsynth/fluidsynth.cpp $
 * $Id: fluidsynth.cpp 30944 2008-02-23 22:50:18Z sev $
 */

#include "common/scummsys.h"

#ifdef USE_FLUIDSYNTH

#include "common/config-manager.h"
#include "sound/mpu401.h"
#include "sound/softsynth/emumidi.h"

#include <fluidsynth.h>

class MidiDriver_FluidSynth : public MidiDriver_Emulated {
private:
      MidiChannel_MPU401 _midiChannels[16];
      fluid_settings_t *_settings;
      fluid_synth_t *_synth;
      int _soundFont;
      int _outputRate;
      Audio::SoundHandle _handle;

protected:
      // Because GCC complains about casting from const to non-const...
      void setInt(const char *name, int val);
      void setNum(const char *name, double num);
      void setStr(const char *name, const char *str);

      void generateSamples(int16 *buf, int len);

public:
      MidiDriver_FluidSynth(Audio::Mixer *mixer);

      int open();
      void close();
      void send(uint32 b);

      MidiChannel *allocateChannel();
      MidiChannel *getPercussionChannel();

      // AudioStream API
      bool isStereo() const { return true; }
      int getRate() const { return _outputRate; }
};

// MidiDriver method implementations

MidiDriver_FluidSynth::MidiDriver_FluidSynth(Audio::Mixer *mixer)
      : MidiDriver_Emulated(mixer) {

      for (int i = 0; i < ARRAYSIZE(_midiChannels); i++) {
            _midiChannels[i].init(this, i);
      }

      // It ought to be possible to get FluidSynth to generate samples at
      // lower

      _outputRate = _mixer->getOutputRate();
      if (_outputRate < 22050)
            _outputRate = 22050;
      else if (_outputRate > 96000)
            _outputRate = 96000;
}

void MidiDriver_FluidSynth::setInt(const char *name, int val) {
      char *name2 = strdup(name);

      fluid_settings_setint(_settings, name2, val);
      free(name2);
}

void MidiDriver_FluidSynth::setNum(const char *name, double val) {
      char *name2 = strdup(name);

      fluid_settings_setnum(_settings, name2, val);
      free(name2);
}

void MidiDriver_FluidSynth::setStr(const char *name, const char *val) {
      char *name2 = strdup(name);
      char *val2 = strdup(val);

      fluid_settings_setstr(_settings, name2, val2);
      free(name2);
      free(val2);
}

int MidiDriver_FluidSynth::open() {
      if (_isOpen)
            return MERR_ALREADY_OPEN;

      if (!ConfMan.hasKey("soundfont"))
            error("FluidSynth requires a 'soundfont' setting");

      _settings = new_fluid_settings();

      // The default gain setting is ridiculously low - at least for me. This
      // cannot be fixed by ScummVM's volume settings because they can only
      // soften the sound, not amplify it, so instead we add an option to
      // adjust the gain of FluidSynth itself.

      double gain = (double)ConfMan.getInt("midi_gain") / 100.0;

      setNum("synth.gain", gain);
      setNum("synth.sample-rate", _outputRate);

      _synth = new_fluid_synth(_settings);

      // In theory, this ought to reduce CPU load... but it doesn't make any
      // noticeable difference for me, so disable it for now.

      // fluid_synth_set_interp_method(_synth, -1, FLUID_INTERP_LINEAR);
      // fluid_synth_set_reverb_on(_synth, 0);
      // fluid_synth_set_chorus_on(_synth, 0);

      const char *soundfont = ConfMan.get("soundfont").c_str();

      _soundFont = fluid_synth_sfload(_synth, soundfont, 1);
      if (_soundFont == -1)
            error("Failed loading custom sound font '%s'", soundfont);

      MidiDriver_Emulated::open();

      // The MT-32 emulator uses kSFXSoundType here. I don't know why.
      _mixer->playInputStream(Audio::Mixer::kMusicSoundType, &_handle, this, -1, 255, 0, false, true);
      return 0;
}

void MidiDriver_FluidSynth::close() {
      if (!_isOpen)
            return;
      _isOpen = false;

      _mixer->stopHandle(_handle);

      if (_soundFont != -1)
            fluid_synth_sfunload(_synth, _soundFont, 1);

      delete_fluid_synth(_synth);
      delete_fluid_settings(_settings);
}

void MidiDriver_FluidSynth::send(uint32 b) {
      //byte param3 = (byte) ((b >> 24) & 0xFF);
      uint param2 = (byte) ((b >> 16) & 0xFF);
      uint param1 = (byte) ((b >>  8) & 0xFF);
      byte cmd    = (byte) (b & 0xF0);
      byte chan   = (byte) (b & 0x0F);

      switch (cmd) {
      case 0x80:  // Note Off
            fluid_synth_noteoff(_synth, chan, param1);
            break;
      case 0x90:  // Note On
            fluid_synth_noteon(_synth, chan, param1, param2);
            break;
      case 0xA0:  // Aftertouch
            break;
      case 0xB0:  // Control Change
            fluid_synth_cc(_synth, chan, param1, param2);
            break;
      case 0xC0:  // Program Change
            fluid_synth_program_change(_synth, chan, param1);
            break;
      case 0xD0:  // Channel Pressure
            break;
      case 0xE0:  // Pitch Bend
            fluid_synth_pitch_bend(_synth, chan, (param2 << 7) | param1);
            break;
      case 0xF0:  // SysEx
            // We should never get here! SysEx information has to be
            // sent via high-level semantic methods.
            warning("MidiDriver_FluidSynth: Receiving SysEx command on a send() call");
            break;
      default:
            warning("MidiDriver_FluidSynth: Unknown send() command 0x%02X", cmd);
            break;
      }
}

MidiChannel *MidiDriver_FluidSynth::allocateChannel() {
      for (int i = 0; i < ARRAYSIZE(_midiChannels); i++) {
            if (i != 9 && _midiChannels[i].allocate())
                  return &_midiChannels[i];
      }
      return NULL;
}

MidiChannel *MidiDriver_FluidSynth::getPercussionChannel() {
      return &_midiChannels[9];
}

MidiDriver *MidiDriver_FluidSynth_create(Audio::Mixer *mixer) {
      return new MidiDriver_FluidSynth(mixer);
}

void MidiDriver_FluidSynth::generateSamples(int16 *data, int len) {
      fluid_synth_write_s16(_synth, len, data, 0, 2, data, 1, 2);
}

#endif

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