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ab784944ea
I suspect this is the format for AGI V1 sound resources as well. It is currently implemented by splitting getNextNote() to getNextNote_v2() and getNextNote_v1(). Since the V1 format consists of simple register values to the sound chip in PCjr, this could probably be made more cleanly by refactoring the code to resemble the chip more closely, so that its state is updated by writing to the registers.
162 lines
4.3 KiB
C++
162 lines
4.3 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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*/
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#ifndef AGI_SOUND_H
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#define AGI_SOUND_H
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#include "audio/mixer.h"
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namespace Agi {
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#define SOUND_EMU_NONE 0
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#define SOUND_EMU_PC 1
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#define SOUND_EMU_PCJR 2
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#define SOUND_EMU_MAC 3
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#define SOUND_EMU_AMIGA 4
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#define SOUND_EMU_APPLE2GS 5
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#define SOUND_EMU_COCO3 6
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#define SOUND_EMU_MIDI 7
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/**
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* AGI sound note structure.
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*/
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struct AgiNote {
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uint16 duration; ///< Note duration
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uint16 freqDiv; ///< Note frequency divisor (10-bit)
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uint8 attenuation; ///< Note volume attenuation (4-bit)
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/** Reads an AgiNote through the given pointer. */
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void read(const uint8 *ptr) {
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duration = READ_LE_UINT16(ptr);
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uint16 freqByte0 = *(ptr + 2); // Bits 4-9 of the frequency divisor
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uint16 freqByte1 = *(ptr + 3); // Bits 0-3 of the frequency divisor
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// Merge the frequency divisor's bits together into a single variable
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freqDiv = ((freqByte0 & 0x3F) << 4) | (freqByte1 & 0x0F);
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attenuation = *(ptr + 4) & 0x0F;
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}
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};
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/**
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* AGI sound resource types.
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* It's probably coincidence that all the values here are powers of two
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* as they're simply the different used values in AGI sound resources'
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* starts (The first 16-bit little endian word, to be precise).
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*/
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enum AgiSoundEmuType {
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AGI_SOUND_SAMPLE = 0x0001,
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AGI_SOUND_MIDI = 0x0002,
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AGI_SOUND_4CHN = 0x0008
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};
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class SoundMgr;
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class SoundGen {
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public:
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SoundGen(AgiEngine *vm, Audio::Mixer *pMixer) : _vm(vm), _mixer(pMixer) {
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_sampleRate = pMixer->getOutputRate();
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}
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virtual ~SoundGen() {}
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virtual void play(int resnum) = 0;
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virtual void stop(void) = 0;
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AgiEngine *_vm;
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Audio::Mixer *_mixer;
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Audio::SoundHandle _soundHandle;
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uint32 _sampleRate;
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};
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/**
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* AGI sound resource structure.
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*/
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class AgiSound {
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public:
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AgiSound(SoundMgr &manager) : _manager(manager), _isPlaying(false), _isValid(false) {}
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virtual ~AgiSound() {}
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virtual void play() { _isPlaying = true; }
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virtual void stop() { _isPlaying = false; }
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virtual bool isPlaying() { return _isPlaying; }
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virtual uint16 type() = 0;
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/**
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* A named constructor for creating different types of AgiSound objects
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* from a raw sound resource.
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*
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* NOTE: This function should take responsibility for freeing the raw resource
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* from memory using free() or delegate the responsibility onwards to some other
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* function!
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*/
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static AgiSound *createFromRawResource(uint8 *data, uint32 len, int resnum, SoundMgr &manager, int soundemu);
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protected:
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SoundMgr &_manager; ///< AGI sound manager object
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bool _isPlaying; ///< Is the sound playing?
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bool _isValid; ///< Is this a valid sound object?
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};
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class PCjrSound : public AgiSound {
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public:
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PCjrSound(uint8 *data, uint32 len, int resnum, SoundMgr &manager);
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~PCjrSound() { free(_data); }
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virtual uint16 type() { return _type; }
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const uint8 *getVoicePointer(uint voiceNum);
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uint8 *getData() { return _data; }
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uint32 getLength() { return _len; }
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protected:
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uint8 *_data; ///< Raw sound resource data
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uint32 _len; ///< Length of the raw sound resource
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uint16 _type; ///< Sound resource type
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};
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class SoundMgr {
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public:
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SoundMgr(AgiEngine *agi, Audio::Mixer *pMixer);
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~SoundMgr();
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void setVolume(uint8 volume);
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void unloadSound(int);
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void playSound();
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int initSound();
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void deinitSound();
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void startSound(int, int);
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void stopSound();
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void soundIsFinished();
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private:
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int _endflag;
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AgiEngine *_vm;
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SoundGen *_soundGen;
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int _playingSound;
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};
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} // End of namespace Agi
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#endif /* AGI_SOUND_H */
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