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audiocd.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/audiocd.cpp $
 * $Id: audiocd.cpp 30944 2008-02-23 22:50:18Z sev $
 *
 */

#include "sound/audiocd.h"
#include "sound/audiostream.h"
#include "sound/mp3.h"
#include "sound/vorbis.h"
#include "sound/flac.h"
#include "engines/engine.h"
#include "common/file.h"
#include "common/util.h"
#include "common/system.h"

DECLARE_SINGLETON(Audio::AudioCDManager);

namespace Audio {

AudioCDManager::AudioCDManager() {
      _cd.playing = false;
      _cd.track = 0;
      _cd.start = 0;
      _cd.duration = 0;
      _cd.numLoops = 0;
      _mixer = g_system->getMixer();
      assert(_mixer);
}

void AudioCDManager::play(int track, int numLoops, int startFrame, int duration) {
      if (numLoops != 0 || startFrame != 0) {
            _cd.track = track;
            _cd.numLoops = numLoops;
            _cd.start = startFrame;
            _cd.duration = duration;

            // Try to load the track from a compressed data file, and if found, use
            // that. If not found, attempt to start regular Audio CD playback of
            // the requested track.
            char trackName[2][16];
            sprintf(trackName[0], "track%d", track);
            sprintf(trackName[1], "track%02d", track);
            Audio::AudioStream *stream = 0;

            for (int i = 0; !stream && i < 2; ++i) {
                  /*
                  FIXME: Seems numLoops == 0 and numLoops == 1 both indicate a single repetition,
                  while all other positive numbers indicate precisely the number of desired
                  repetitions. Finally, -1 means infinitely many
                  */
                  // We multiply by 40 / 3 = 1000 / 75 to convert frames to milliseconds
                  stream = AudioStream::openStreamFile(trackName[i], startFrame * 40 / 3, duration * 40 / 3, (numLoops < 1) ? numLoops + 1 : numLoops);
            }

            // Stop any currently playing emulated track
            _mixer->stopHandle(_cd.handle);

            // HACK: We abuse _cd.playing to store whether we are playing a real or an emulated track.
            if (stream != 0) {
                  _cd.playing = true;
                  _mixer->playInputStream(Audio::Mixer::kMusicSoundType, &_cd.handle, stream);
            } else {
                  _cd.playing = false;
                  g_system->playCD(track, numLoops, startFrame, duration);
            }
      }
}

void AudioCDManager::stop() {
      if (_cd.playing) {
            // Audio CD emulation
            _mixer->stopHandle(_cd.handle);
            _cd.playing = false;
      } else {
            // Real Audio CD
            g_system->stopCD();
      }
}

bool AudioCDManager::isPlaying() const {
      if (_cd.playing) {
            // Audio CD emulation
            return _mixer->isSoundHandleActive(_cd.handle);
      } else {
            // Real Audio CD
            return g_system->pollCD();
      }
}

void AudioCDManager::updateCD() {
      if (_cd.playing) {
            // Check whether the audio track stopped playback
            if (!_mixer->isSoundHandleActive(_cd.handle)) {
                  // FIXME: We do not update the numLoops parameter here (and in fact,
                  // currently can't do that). Luckily, only one engine ever checks
                  // this part of the AudioCD status, namely the SCUMM engine; and it
                  // only checks whether the track is currently set to infinite looping
                  // or not.
                  _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;
}

} // End of namespace Audio

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