90 lines
2.6 KiB
C++
90 lines
2.6 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 modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation, either version 3 of the License, or
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* (at your option) any later version.
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*
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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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*
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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, see <http://www.gnu.org/licenses/>.
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*
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*/
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#ifndef KYRA_SOUND_PCDRIVER_H
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#define KYRA_SOUND_PCDRIVER_H
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#include "kyra/resource/resource.h"
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namespace Audio {
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class Mixer;
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}
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namespace Kyra {
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class PCSoundDriver {
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public:
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PCSoundDriver() : _soundData(0), _soundDataSize(0) {}
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virtual ~PCSoundDriver() {}
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virtual void initDriver() = 0;
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virtual void setSoundData(uint8 *data, uint32 size) = 0;
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virtual void startSound(int track, int volume) = 0;
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virtual bool isChannelPlaying(int channel) const = 0;
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virtual void stopAllChannels() = 0;
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virtual int getSoundTrigger() const { return 0; }
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virtual void resetSoundTrigger() {}
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virtual void setMusicVolume(uint8 volume) = 0;
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virtual void setSfxVolume(uint8 volume) = 0;
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// AdLiB (Kyra 1) specific
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virtual void setSyncJumpMask(uint16) {}
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protected:
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uint8 *getProgram(int progId) {
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// Safety check: invalid progId would crash.
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if (progId < 0 || progId >= (int32)_soundDataSize / 2)
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return nullptr;
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const uint16 offset = READ_LE_UINT16(_soundData + 2 * progId);
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// In case an invalid offset is specified we return nullptr to
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// indicate an error. 0xFFFF seems to indicate "this is not a valid
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// program/instrument". However, 0 is also invalid because it points
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// inside the offset table itself. We also ignore any offsets outside
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// of the actual data size.
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// The original does not contain any safety checks and will simply
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// read outside of the valid sound data in case an invalid offset is
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// encountered.
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if (offset == 0 || offset >= _soundDataSize) {
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return nullptr;
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} else {
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return _soundData + offset;
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}
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}
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uint8 *_soundData;
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uint32 _soundDataSize;
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public:
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static PCSoundDriver *createAdLib(Audio::Mixer *mixer, int version);
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#ifdef ENABLE_EOB
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static PCSoundDriver *createPCSpk(Audio::Mixer *mixer, bool pcJRMode);
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#endif
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};
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} // End of namespace Kyra
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#endif
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