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default-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.
 *
 * $URL$
 * $Id$
 *
 */

#include "backends/audiocd/default/default-audiocd.h"
#include "audio/audiostream.h"
#include "common/system.h"

DefaultAudioCDManager::DefaultAudioCDManager() {
      _cd.playing = false;
      _cd.track = 0;
      _cd.start = 0;
      _cd.duration = 0;
      _cd.numLoops = 0;
      _cd.volume = Audio::Mixer::kMaxChannelVolume;
      _cd.balance = 0;
      _mixer = g_system->getMixer();
      _emulating = false;
      assert(_mixer);
}

00043 void DefaultAudioCDManager::play(int track, int numLoops, int startFrame, int duration, bool only_emulate) {
      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::SeekableAudioStream *stream = 0;

            for (int i = 0; !stream && i < 2; ++i)
                  stream = Audio::SeekableAudioStream::openStreamFile(trackName[i]);

            // Stop any currently playing emulated track
            _mixer->stopHandle(_handle);

            if (stream != 0) {
                  Audio::Timestamp start = Audio::Timestamp(0, startFrame, 75);
                  Audio::Timestamp end = duration ? Audio::Timestamp(0, startFrame + duration, 75) : stream->getLength();

                  /*
                  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
                  */
                  _emulating = true;
                  _mixer->playStream(Audio::Mixer::kMusicSoundType, &_handle,
                                          Audio::makeLoopingAudioStream(stream, start, end, (numLoops < 1) ? numLoops + 1 : numLoops), -1, _cd.volume, _cd.balance);
            } else {
                  _emulating = false;
                  if (!only_emulate)
                        playCD(track, numLoops, startFrame, duration);
            }
      }
}

00084 void DefaultAudioCDManager::stop() {
      if (_emulating) {
            // Audio CD emulation
            _mixer->stopHandle(_handle);
            _emulating = false;
      } else {
            // Real Audio CD
            stopCD();
      }
}

00095 bool DefaultAudioCDManager::isPlaying() const {
      if (_emulating) {
            // Audio CD emulation
            return _mixer->isSoundHandleActive(_handle);
      } else {
            // Real Audio CD
            return pollCD();
      }
}

00105 void DefaultAudioCDManager::setVolume(byte volume) {
      _cd.volume = volume;
      if (_emulating) {
            // Audio CD emulation
            if (_mixer->isSoundHandleActive(_handle))
                  _mixer->setChannelVolume(_handle, _cd.volume);
      } else {
            // Real Audio CD

            // Unfortunately I can't implement this atm
            // since SDL doesn't seem to offer an interface method for this.

            // g_system->setVolumeCD(_cd.volume);
      }
}

00121 void DefaultAudioCDManager::setBalance(int8 balance) {
      _cd.balance = balance;
      if (_emulating) {
            // Audio CD emulation
            if (isPlaying())
                  _mixer->setChannelBalance(_handle, _cd.balance);
      } else {
            // Real Audio CD

            // Unfortunately I can't implement this atm
            // since SDL doesn't seem to offer an interface method for this.

            // g_system->setBalanceCD(_cd.balance);
      }
}

00137 void DefaultAudioCDManager::update() {
      if (_emulating) {
            // Check whether the audio track stopped playback
            if (!_mixer->isSoundHandleActive(_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.
                  _emulating = false;
            }
      } else {
            updateCD();
      }
}

00153 DefaultAudioCDManager::Status DefaultAudioCDManager::getStatus() const {
      Status info = _cd;
      info.playing = isPlaying();
      return info;
}

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