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music.cpp

/* ScummVM - Scumm Interpreter
 * Copyright (C) 2004-2005 The ScummVM project
 *
 * The ReInherit Engine is (C)2000-2003 by Daniel Balsom.
 *
 * 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/saga/music.cpp,v 1.69.2.1 2005/10/18 02:11:20 sev Exp $
 *
 */
#include "saga/saga.h"

#include "saga/rscfile.h"
#include "saga/music.h"
#include "saga/stream.h"
#include "sound/audiostream.h"
#include "sound/mididrv.h"
#include "sound/midiparser.h"
#include "sound/mp3.h"
#include "sound/vorbis.h"
#include "sound/flac.h"
#include "common/config-manager.h"
#include "common/file.h"

namespace Saga {

#define BUFFER_SIZE 4096

struct TrackFormat {
      DigitalTrackInfo* (*openTrackFunction)(int);
};

static const TrackFormat TRACK_FORMATS[] = {
#ifdef USE_FLAC
      { getFlacTrack },
#endif
#ifdef USE_VORBIS
      { getVorbisTrack },
#endif
#ifdef USE_MAD
      { getMP3Track },
#endif

      { NULL } // Terminator
};

// I haven't decided yet if it's a good idea to make looping part of the audio
// stream class, or if I should use a "wrapper" class, like I did for Broken
// Sword 2, to make it easier to add support for compressed music... but I'll
// worry about that later.

class RAWInputStream : public AudioStream {
private:
      ResourceContext *_context;
      Common::File *_file;
      uint32 _filePos;
      uint32 _startPos;
      uint32 _endPos;
      bool _finished;
      bool _looping;
      int16 _buf[BUFFER_SIZE];
      const int16 *_bufferEnd;
      const int16 *_pos;
      const GameSoundInfo *_musicInfo;

      void refill();
      bool eosIntern() const {
            return _pos >= _bufferEnd;
      }

public:
      RAWInputStream(SagaEngine *vm, ResourceContext *context, uint32 resourceId, bool looping);

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

      bool endOfData() const  { return eosIntern(); }
      bool isStereo() const   { return _musicInfo->stereo; }
      int getRate() const     { return _musicInfo->frequency; }
};

RAWInputStream::RAWInputStream(SagaEngine *vm, ResourceContext *context, uint32 resourceId, bool looping)
      : _context(context), _finished(false), _looping(looping), _bufferEnd(_buf + BUFFER_SIZE) {

      ResourceData * resourceData;

      resourceData = vm->_resource->getResourceData(context, resourceId);
      _file = context->getFile(resourceData);
      _musicInfo = vm->getMusicInfo();

      if (_musicInfo == NULL) {
            error("RAWInputStream() wrong musicInfo");
      }

      // Determine the end position
      _startPos = resourceData->offset;
      _endPos = _startPos + resourceData->size;
      _filePos = _startPos;

      // Read in initial data
      refill();
}

int RAWInputStream::readBuffer(int16 *buffer, const int numSamples) {
      int samples = 0;
      while (samples < numSamples && !eosIntern()) {
            const int len = MIN(numSamples - samples, (int) (_bufferEnd - _pos));
            memcpy(buffer, _pos, len * 2);
            buffer += len;
            _pos += len;
            samples += len;
            if (_pos >= _bufferEnd) {
                  refill();
            }
      }
      return samples;
}

void RAWInputStream::refill() {
      if (_finished)
            return;

      uint32 lengthLeft;
      byte *ptr = (byte *) _buf;


      _file->seek(_filePos, SEEK_SET);

      if (_looping)
            lengthLeft = 2 * BUFFER_SIZE;
      else
            lengthLeft = MIN((uint32) (2 * BUFFER_SIZE), _endPos - _filePos);

      while (lengthLeft > 0) {
            uint32 len = _file->read(ptr, MIN(lengthLeft, _endPos - _file->pos()));

            if (len & 1)
                  len--;

            if (_context->isBigEndian) {
                  uint16 *ptr16 = (uint16 *)ptr;
                  for (uint32 i = 0; i < (len / 2); i++)
                        ptr16[i] = TO_BE_16(ptr16[i]);
            }

            lengthLeft -= len;
            ptr += len;

            if (lengthLeft > 0)
                  _file->seek(_startPos);
      }

      _filePos = _file->pos();
      _pos = _buf;
      _bufferEnd = (int16 *)ptr;

      if (!_looping && _filePos >= _endPos) {
            _finished = true;
      }
}


MusicPlayer::MusicPlayer(MidiDriver *driver) : _parser(0), _driver(driver), _looping(false), _isPlaying(false), _passThrough(false), _isGM(false) {
      memset(_channel, 0, sizeof(_channel));
      _masterVolume = 0;
      this->open();
}

MusicPlayer::~MusicPlayer() {
      _driver->setTimerCallback(NULL, NULL);
      stopMusic();
      this->close();
}

void MusicPlayer::setVolume(int volume) {
      if (volume < 0)
            volume = 0;
      else if (volume > 255)
            volume = 255;

      if (_masterVolume == volume)
            return;

      _masterVolume = volume;

      for (int i = 0; i < 16; ++i) {
            if (_channel[i]) {
                  _channel[i]->volume(_channelVolume[i] * _masterVolume / 255);
            }
      }
}

int MusicPlayer::open() {
      // Don't ever call open without first setting the output driver!
      if (!_driver)
            return 255;

      int ret = _driver->open();
      if (ret)
            return ret;

      _driver->setTimerCallback(this, &onTimer);
      return 0;
}

void MusicPlayer::close() {
      stopMusic();
      if (_driver)
            _driver->close();
      _driver = 0;
}

void MusicPlayer::send(uint32 b) {
      if (_passThrough) {
            _driver->send(b);
            return;
      }

      byte channel = (byte)(b & 0x0F);
      if ((b & 0xFFF0) == 0x07B0) {
            // Adjust volume changes by master volume
            byte volume = (byte)((b >> 16) & 0x7F);
            _channelVolume[channel] = volume;
            volume = volume * _masterVolume / 255;
            b = (b & 0xFF00FFFF) | (volume << 16);
      } else if ((b & 0xF0) == 0xC0 && !_isGM && !_nativeMT32) {
            b = (b & 0xFFFF00FF) | MidiDriver::_mt32ToGm[(b >> 8) & 0xFF] << 8;
      }
      else if ((b & 0xFFF0) == 0x007BB0) {
            //Only respond to All Notes Off if this channel
            //has currently been allocated
            if (_channel[b & 0x0F])
                  return;
      }

      if (!_channel[channel])
            _channel[channel] = (channel == 9) ? _driver->getPercussionChannel() : _driver->allocateChannel();

      if (_channel[channel])
            _channel[channel]->send(b);
}

void MusicPlayer::metaEvent(byte type, byte *data, uint16 length) {
      // FIXME: The "elkfanfare" is played much too quickly. There are some
      //        meta events that we don't handle. Perhaps there is a
      //        connection...?

      switch (type) {
      case 0x2F:  // End of Track
            if (_looping)
                  _parser->jumpToTick(0);
            else
                  stopMusic();
            break;
      default:
            //warning("Unhandled meta event: %02x", type);
            break;
      }
}

void MusicPlayer::onTimer(void *refCon) {
      MusicPlayer *music = (MusicPlayer *)refCon;
      if (music->_isPlaying)
            music->_parser->onTimer();
}

void MusicPlayer::playMusic() {
      _isPlaying = true;
}

void MusicPlayer::stopMusic() {
      _isPlaying = false;
      if (_parser) {
            _parser->unloadMusic();
            _parser = NULL;
      }
}

Music::Music(SagaEngine *vm, Audio::Mixer *mixer, MidiDriver *driver, int enabled) : _vm(vm), _mixer(mixer), _enabled(enabled), _adlib(false) {
      _player = new MusicPlayer(driver);
      _currentVolume = 0;

      xmidiParser = MidiParser::createParser_XMIDI();
      smfParser = MidiParser::createParser_SMF();     

      _musicContext = _vm->_resource->getContext(GAME_MUSICFILE);

      _songTableLen = 0;
      _songTable = 0;

      _track = NULL;
}

Music::~Music() {
      _mixer->stopHandle(_musicHandle);
      delete _player;
      xmidiParser->setMidiDriver(NULL);
      smfParser->setMidiDriver(NULL);
      delete xmidiParser;
      delete smfParser;

      free(_songTable);
}

void Music::musicVolumeGaugeCallback(void *refCon) {
      ((Music *)refCon)->musicVolumeGauge();
}

void Music::musicVolumeGauge() {
      int volume;

      _currentVolumePercent += 10;

      if (_currentVolume - _targetVolume > 0) { // Volume decrease
            volume = _targetVolume + (_currentVolume - _targetVolume) * (100 - _currentVolumePercent) / 100;
      } else {
            volume = _currentVolume + (_targetVolume - _currentVolume) * _currentVolumePercent / 100;
      }

      if (volume < 0)
            volume = 1;

      _mixer->setVolumeForSoundType(Audio::Mixer::kMusicSoundType, volume);
      _player->setVolume(volume);

      if (_currentVolumePercent == 100) {
            Common::g_timer->removeTimerProc(&musicVolumeGaugeCallback);
            _currentVolume = _targetVolume;
      }
}

void Music::setVolume(int volume, int time) {
      _targetVolume = volume * 2; // ScummVM has different volume scale
      _currentVolumePercent = 0;

      if (volume == -1) // Set Full volume
            volume = 255;

      if (time == 1) {
            _mixer->setVolumeForSoundType(Audio::Mixer::kMusicSoundType, volume);
            _player->setVolume(volume);
            Common::g_timer->removeTimerProc(&musicVolumeGaugeCallback);
            _currentVolume = volume;
            return;
      }

      Common::g_timer->installTimerProc(&musicVolumeGaugeCallback, time * 100L, this);
}

bool Music::isPlaying() {
      return _mixer->isSoundHandleActive(_musicHandle) || _player->isPlaying();
}

void Music::play(uint32 resourceId, MusicFlags flags) {
      AudioStream *audioStream = NULL;
      MidiParser *parser;
      ResourceContext *context;
      byte *resourceData;
      size_t resourceSize;

      debug(2, "Music::play %d, %d", resourceId, flags);

      if (!_enabled) {
            return;
      }

      if (isPlaying() && _trackNumber == resourceId) {
            return;
      }

      _trackNumber = resourceId;
      _player->stopMusic();
      _mixer->stopHandle(_musicHandle);

      int realTrackNumber;

      if (_vm->getGameType() == GType_ITE) {
            if (flags == MUSIC_DEFAULT) {
                  if (resourceId == 13 || resourceId == 19) {
                        flags = MUSIC_NORMAL;
                  } else {
                        flags = MUSIC_LOOP;
                  }
            }
            realTrackNumber = resourceId - 8;
      } else {
            realTrackNumber = resourceId + 1;
      }

      // Try to open standalone digital track
      for (int i = 0; i < ARRAYSIZE(TRACK_FORMATS) - 1; ++i)
            if ((_track = TRACK_FORMATS[i].openTrackFunction(realTrackNumber))) {
                  break;
            }
      if (_track) {
            _track->play(_mixer, &_musicHandle, (flags == MUSIC_LOOP) ? -1 : 1, 10000);
            return;
      }

      if (_vm->getGameType() == GType_ITE) {
            if (resourceId >= 9 && resourceId <= 34) {
                  if (_musicContext != NULL) {
                        //TODO: check resource size
                        audioStream = new RAWInputStream(_vm, _musicContext, resourceId - 9, flags == MUSIC_LOOP);
                  }
            }
      }

      if (audioStream) {
            debug(2, "Playing digitized music");
            _mixer->playInputStream(Audio::Mixer::kMusicSoundType, &_musicHandle, audioStream);
            return;
      }

      if (flags == MUSIC_DEFAULT) {
            flags = MUSIC_NORMAL;
      }

      // FIXME: Is resource_data ever freed?
      // Load MIDI/XMI resource data

      if (_vm->getGameType() == GType_ITE) {
            context = _vm->_resource->getContext(GAME_MUSICFILE_GM);
            if (context == NULL) {
                  context = _vm->_resource->getContext(GAME_RESOURCEFILE);
            }           
      } else {
            // I've listened to music from both the FM and the GM
            // file, and I've tentatively reached the conclusion
            // that they are both General MIDI. My guess is that
            // the FM file has been reorchestrated to sound better
            // on Adlib and other FM synths.
            //
            // Sev says the Adlib music does not sound like in the
            // original, but I still think assuming General MIDI is
            // the right thing to do. Some music, like the End
            // Title (song 0) sound absolutely atrocious when piped
            // through our MT-32 to GM mapping.
            //
            // It is, however, quite possible that the original
            // used a different GM to FM mapping. If the original
            // sounded markedly better, perhaps we should add some
            // way of replacing our stock mapping in adlib.cpp?
            //
            // For the composer's own recording of the End Title,
            // see http://www.johnottman.com/

            // Oddly enough, the intro music (song 1) is very
            // different in the two files. I have no idea why.

            if (hasAdlib()) {
                  context = _vm->_resource->getContext(GAME_MUSICFILE_FM);
            } else {
                  context = _vm->_resource->getContext(GAME_MUSICFILE_GM);
            }
      }

      _player->setGM(true);

      _vm->_resource->loadResource(context, resourceId, resourceData, resourceSize);

      if (resourceSize < 4) {
            error("Music::play() wrong music resource size");
      }

      if (xmidiParser->loadMusic(resourceData, resourceSize)) {
            parser = xmidiParser;
      } else {
            if (smfParser->loadMusic(resourceData, resourceSize)) {
                  parser = smfParser;
            } else {
                  error("Music::play() wrong music resource");
            }
      }

      parser->setTrack(0);
      parser->setMidiDriver(_player);
      parser->setTimerRate(_player->getBaseTempo());
      parser->property(MidiParser::mpCenterPitchWheelOnUnload, 1);

      _player->_parser = parser;
      _player->setVolume(_vm->_musicVolume == 10 ? 255 : _vm->_musicVolume * 25);

      if (flags & MUSIC_LOOP)
            _player->setLoop(true);
      else
            _player->setLoop(false);

      _player->playMusic();
}

void Music::pause(void) {
      //TODO: do it
}

void Music::resume(void) {
      //TODO: do it}
}

void Music::stop(void) {
      //TODO: do it
}

} // End of namespace Saga


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