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audiocd.cpp

/* ScummVM - Scumm Interpreter
 * Copyright (C) 2003-2004 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/sound/audiocd.cpp,v 1.13 2004/09/28 20:19:33 fingolfin Exp $
 *
 */

#include "stdafx.h"

#include "sound/audiocd.h"
#include "sound/mp3.h"
#include "sound/vorbis.h"
#include "sound/flac.h"
#include "base/engine.h"
#include "common/file.h"
#include "common/util.h"

struct TrackFormat {
      /** Decodername */
      const char* decoderName;
      /** 
       * Pointer to a function which tries to open the specified track - the only argument
       * is the number of the track to be played.
       * Returns either the DigitalTrackInfo object representing the requested track or null
       * in case of an error
       */
      DigitalTrackInfo* (*openTrackFunction)(int);
};

static const TrackFormat TRACK_FORMATS[] = {
      /* decoderName,         openTrackFunction */ 
#ifdef USE_FLAC
      { "Flac",               getFlacTrack },
#endif // #ifdef USE_FLAC
#ifdef USE_VORBIS
      { "Ogg Vorbis",         getVorbisTrack },
#endif // #ifdef USE_VORBIS
#ifdef USE_MAD
      { "Mpeg Layer 3", getMP3Track },
#endif // #ifdef USE_MAD

      { NULL, NULL } // Terminator
};


AudioCDManager::AudioCDManager() {
      memset(&_cd, 0, sizeof(_cd));
      memset(_cached_tracks, 0, sizeof(_cached_tracks));
      memset(_track_info, 0, sizeof(_track_info));
      _current_cache = 0;
}

void AudioCDManager::play(int track, int numLoops, int startFrame, int duration) {
      if (numLoops != 0 || startFrame != 0) {
            // Try to load the track from a .mp3/.ogg file, and if found, use
            // that. If not found, attempt to do regular Audio CD playback of
            // the requested track.
            int index = getCachedTrack(track);

            _cd.track = track;
            _cd.numLoops = numLoops;
            _cd.start = startFrame;
            _cd.duration = duration;

            if (index >= 0) {
                  g_engine->_mixer->stopHandle(_cd.handle);
                  _cd.playing = true;
                  _track_info[index]->play(g_engine->_mixer, &_cd.handle, _cd.start, _cd.duration);
            } else {
                  g_system->playCD(track, numLoops, startFrame, duration);
            }
      }
}

void AudioCDManager::stop() {
      if (_cd.playing) {
            g_engine->_mixer->stopHandle(_cd.handle);
            _cd.playing = false;
      } else {
            g_system->stopCD();
      }
}

bool AudioCDManager::isPlaying() const {
      return _cd.playing || g_system->pollCD();
}

void AudioCDManager::updateCD() {
      if (_cd.playing) {
            // If the sound handle is 0, then playback stopped.
            if (!_cd.handle.isActive()) {
                  // If playback just stopped, check if the current track is supposed
                  // to be repeated, and if that's the case, play it again. Else, stop
                  // the CD explicitly.
                  if (_cd.numLoops == -1 || --_cd.numLoops > 0) {
                        int index = getCachedTrack(_cd.track);
                        assert(index >= 0);
                        _track_info[index]->play(g_engine->_mixer, &_cd.handle, _cd.start, _cd.duration);
                  } else {
                        g_engine->_mixer->stopHandle(_cd.handle);
                        _cd.playing = false;
                  }
            }
      } else {
            g_system->updateCD();
      }
}

AudioCDManager::Status AudioCDManager::getStatus() const {
      // TODO: This could be improved for "real" CD playback.
      // But to do that, we would have to extend the OSystem interface.
      Status info = _cd;
      info.playing = isPlaying();
      return info;
}

int AudioCDManager::getCachedTrack(int track) {
      int i;
      int current_index;

      // See if we find the track in the cache
      for (i = 0; i < CACHE_TRACKS; i++)
            if (_cached_tracks[i] == track) {
                  if (_track_info[i])
                        return i;
                  else
                        return -1;
            }
      current_index = _current_cache++;
      _current_cache %= CACHE_TRACKS;

      // Not found, see if it exists

      // First, delete the previous track info object
      delete _track_info[current_index];
      _track_info[current_index] = NULL;

      _cached_tracks[current_index] = track;

      for (i = 0; i < ARRAYSIZE(TRACK_FORMATS)-1 && _track_info[current_index] == NULL; ++i)
            _track_info[current_index] = TRACK_FORMATS[i].openTrackFunction(track);

      if (_track_info[current_index] != NULL)
            return current_index;

      debug(2, "Track %d not available in compressed format", track);
      return -1;
}

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