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/* ScummVM - Scumm Interpreter
* Copyright (C) 2003-2006 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., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
*
* $URL$
* $Id$
*
*/
#include "common/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"
#include "common/system.h"
DECLARE_SINGLETON(Audio::AudioCDManager);
namespace Audio {
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_VORBIS
{ "Ogg Vorbis", getVorbisTrack },
#endif
#ifdef USE_MAD
{ "MPEG Layer 3", getMP3Track },
#endif
{ NULL, NULL } // Terminator
};
AudioCDManager::AudioCDManager() {
memset(&_cd, 0, sizeof(_cd));
memset(_cachedTracks, 0, sizeof(_cachedTracks));
memset(_trackInfo, 0, sizeof(_trackInfo));
_currentCache = 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;
_trackInfo[index]->play(g_engine->_mixer, &_cd.handle, _cd.start, _cd.duration);
} else {
g_system->playCD(track, numLoops, startFrame, duration);
_cd.playing = false;
}
}
}
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 (!g_engine->_mixer->isSoundHandleActive(_cd.handle)) {
// 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);
_trackInfo[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;
// See if we find the track in the cache
for (i = 0; i < CACHE_TRACKS; i++)
if (_cachedTracks[i] == track) {
if (_trackInfo[i])
return i;
else
return -1;
}
int currentIndex = _currentCache++;
_currentCache %= CACHE_TRACKS;
// Not found, see if it exists
// First, delete the previous track info object
delete _trackInfo[currentIndex];
_trackInfo[currentIndex] = NULL;
_cachedTracks[currentIndex] = 0;
for (i = 0; i < ARRAYSIZE(TRACK_FORMATS)-1 && _trackInfo[currentIndex] == NULL; ++i)
_trackInfo[currentIndex] = TRACK_FORMATS[i].openTrackFunction(track);
if (_trackInfo[currentIndex] != NULL) {
_cachedTracks[currentIndex] = track;
return currentIndex;
}
debug(2, "Track %d not available in compressed format", track);
return -1;
}
} // End of namespace Audio
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