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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 "engines/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 a DigitalTrackInfo object representing the requested track or null
* in case of an error
*/
DigitalTrackInfo* (*openTrackFunction)(int);
};
static const TrackFormat s_trackFormats[] = {
/* 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(_cachedTracks, 0, sizeof(_cachedTracks));
memset(_trackInfo, 0, sizeof(_trackInfo));
_cd.playing = false;
_cd.track = 0;
_cd.start = 0;
_cd.duration = 0;
_cd.numLoops = 0;
_currentCacheIdx = 0;
_mixer = g_system->getMixer();
assert(_mixer);
}
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) {
_mixer->stopHandle(_cd.handle);
_cd.playing = true;
/*
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
*/
numLoops = (numLoops < 1) ? numLoops + 1 : numLoops;
_trackInfo[index]->play(_mixer, &_cd.handle, numLoops, _cd.start, _cd.duration);
} else {
g_system->playCD(track, numLoops, startFrame, duration);
_cd.playing = false;
}
}
}
void AudioCDManager::stop() {
if (_cd.playing) {
_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) {
// 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
_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) {
// See if we find the track in the cache
for (int i = 0; i < CACHE_TRACKS; i++)
if (_cachedTracks[i] == track) {
return _trackInfo[i] ? i : -1;
}
// The track is not already in the cache. Try and see if
// we can load it.
DigitalTrackInfo *newTrack = 0;
for (const TrackFormat *format = s_trackFormats;
format->openTrackFunction != NULL && newTrack == NULL;
++format) {
newTrack = format->openTrackFunction(track);
}
int currentIndex = -1;
if (newTrack != NULL) {
// We successfully loaded a digital track. Store it into _trackInfo.
currentIndex = _currentCacheIdx++;
_currentCacheIdx %= CACHE_TRACKS;
// First, delete the previous track info object
delete _trackInfo[currentIndex];
// Then, store the new track info object
_trackInfo[currentIndex] = newTrack;
_cachedTracks[currentIndex] = track;
} else {
debug(2, "Track %d not available in compressed format", track);
}
return currentIndex;
}
} // End of namespace Audio
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