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https://github.com/libretro/scummvm.git
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135 lines
3.9 KiB
C++
135 lines
3.9 KiB
C++
/* ScummVM - Graphic Adventure Engine
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*
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* ScummVM is the legal property of its developers, whose names
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* are too numerous to list here. Please refer to the COPYRIGHT
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* file distributed with this source distribution.
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*
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* This program is free software; you can redistribute it and/or
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* modify it under the terms of the GNU General Public License
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* as published by the Free Software Foundation; either version 2
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* of the License, or (at your option) any later version.
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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* You should have received a copy of the GNU General Public License
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* along with this program; if not, write to the Free Software
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* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
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*
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* $URL$
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* $Id$
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*
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*/
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#include "sound/audiocd.h"
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#include "sound/audiostream.h"
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#include "sound/mp3.h"
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#include "sound/vorbis.h"
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#include "sound/flac.h"
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#include "engines/engine.h"
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#include "common/util.h"
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#include "common/system.h"
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DECLARE_SINGLETON(Audio::AudioCDManager);
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namespace Audio {
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AudioCDManager::AudioCDManager() {
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_cd.playing = false;
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_cd.track = 0;
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_cd.start = 0;
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_cd.duration = 0;
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_cd.numLoops = 0;
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_mixer = g_system->getMixer();
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_emulating = false;
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assert(_mixer);
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}
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void AudioCDManager::play(int track, int numLoops, int startFrame, int duration, bool only_emulate) {
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if (numLoops != 0 || startFrame != 0) {
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_cd.track = track;
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_cd.numLoops = numLoops;
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_cd.start = startFrame;
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_cd.duration = duration;
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// Try to load the track from a compressed data file, and if found, use
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// that. If not found, attempt to start regular Audio CD playback of
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// the requested track.
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char trackName[2][16];
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sprintf(trackName[0], "track%d", track);
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sprintf(trackName[1], "track%02d", track);
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Audio::AudioStream *stream = 0;
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for (int i = 0; !stream && i < 2; ++i) {
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/*
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FIXME: Seems numLoops == 0 and numLoops == 1 both indicate a single repetition,
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while all other positive numbers indicate precisely the number of desired
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repetitions. Finally, -1 means infinitely many
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*/
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// We multiply by 40 / 3 = 1000 / 75 to convert frames to milliseconds
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stream = AudioStream::openStreamFile(trackName[i], startFrame * 40 / 3, duration * 40 / 3, (numLoops < 1) ? numLoops + 1 : numLoops);
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}
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// Stop any currently playing emulated track
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_mixer->stopHandle(_handle);
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if (stream != 0) {
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_emulating = true;
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_mixer->playInputStream(Audio::Mixer::kMusicSoundType, &_handle, stream);
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} else {
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_emulating = false;
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if (!only_emulate)
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g_system->playCD(track, numLoops, startFrame, duration);
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}
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}
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}
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void AudioCDManager::stop() {
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if (_emulating) {
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// Audio CD emulation
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_mixer->stopHandle(_handle);
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_emulating = false;
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} else {
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// Real Audio CD
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g_system->stopCD();
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}
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}
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bool AudioCDManager::isPlaying() const {
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if (_emulating) {
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// Audio CD emulation
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return _mixer->isSoundHandleActive(_handle);
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} else {
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// Real Audio CD
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return g_system->pollCD();
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}
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}
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void AudioCDManager::updateCD() {
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if (_emulating) {
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// Check whether the audio track stopped playback
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if (!_mixer->isSoundHandleActive(_handle)) {
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// FIXME: We do not update the numLoops parameter here (and in fact,
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// currently can't do that). Luckily, only one engine ever checks
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// this part of the AudioCD status, namely the SCUMM engine; and it
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// only checks whether the track is currently set to infinite looping
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// or not.
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_emulating = false;
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}
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} else {
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g_system->updateCD();
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}
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}
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AudioCDManager::Status AudioCDManager::getStatus() const {
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// TODO: This could be improved for "real" CD playback.
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// But to do that, we would have to extend the OSystem interface.
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Status info = _cd;
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info.playing = isPlaying();
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return info;
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}
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} // End of namespace Audio
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