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/* 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.
*
*/
#ifndef BACKENDS_AUDIOCD_ABSTRACT_H
#define BACKENDS_AUDIOCD_ABSTRACT_H
#include "common/scummsys.h"
#include "common/noncopyable.h"
/**
* Abstract Audio CD manager class. Subclasses implement the actual
* functionality.
*/
class AudioCDManager : Common::NonCopyable {
public:
virtual ~AudioCDManager() {}
/**
* A structure containing the current playback information
*/
struct Status {
bool playing;
int track;
int start;
int duration;
int numLoops;
int volume;
int balance;
};
/**
* @name Emulated playback functions
* Engines should call these functions. Not all platforms
* support cd playback, and these functions should try to
* emulate it.
*/
//@{
/**
* Start audio CD playback
* @param track the track to play.
* @param num_loops how often playback should be repeated (-1 = infinitely often).
* @param start_frame the frame at which playback should start (75 frames = 1 second).
* @param duration the number of frames to play.
* @param only_emulate determines if the track should be emulated only
*/
virtual void play(int track, int numLoops, int startFrame, int duration, bool only_emulate = false) = 0;
/**
* Get if audio is being played.
* @return true if CD or emulated audio is playing
*/
virtual bool isPlaying() const = 0;
/**
* Set the audio volume
*/
virtual void setVolume(byte volume) = 0;
/**
* Set the speakers balance
*/
virtual void setBalance(int8 balance) = 0;
/**
* Stop CD or emulated audio playback.
*/
virtual void stop() = 0;
/**
* Update CD or emulated audio status.
*/
virtual void update() = 0;
/**
* Get the playback status.
* @return a Status struct with playback data.
*/
virtual Status getStatus() const = 0;
//@}
/**
* @name Real CD audio methods
* These functions should be called from the emulated
* ones if they can't emulate the audio playback.
*/
//@{
/**
* Initialize the specified CD drive for audio playback.
* @param drive the drive id
* @return true if the CD drive was inited successfully
*/
virtual bool openCD(int drive) = 0;
/**
* Poll CD status.
* @return true if CD audio is playing
*/
virtual bool pollCD() const = 0;
/**
* Start CD audio playback.
* @param track the track to play.
* @param num_loops how often playback should be repeated (-1 = infinitely often).
* @param start_frame the frame at which playback should start (75 frames = 1 second).
* @param duration the number of frames to play.
*/
virtual void playCD(int track, int num_loops, int start_frame, int duration) = 0;
/**
* Stop CD audio playback.
*/
virtual void stopCD() = 0;
/**
* Update CD audio status.
*/
virtual void updateCD() = 0;
//@}
};
#endif
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