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273 lines
10 KiB
C++
273 lines
10 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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*
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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, 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_2GS_H
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#define AGI_SOUND_2GS_H
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#include "common/frac.h"
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#include "audio/audiostream.h"
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namespace Agi {
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// Sample data in SIERRASTANDARD files is in unsigned 8-bit format. A zero
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// occurring in the sample data causes the ES5503 wavetable sound chip in
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// Apple IIGS to halt the corresponding oscillator immediately. We preprocess
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// the sample data by converting it to signed values and the instruments by
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// detecting prematurely stopping samples beforehand.
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//
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// Note: None of the tested SIERRASTANDARD files have zeroes in them. So in
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// practice there is no need to check for them. However, they still do exist
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// in the sample resources.
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#define ZERO_OFFSET 0x80
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// Apple IIGS envelope update frequency defaults to 100Hz. It can be changed,
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// so there might be differences per game, for example.
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#define ENVELOPE_COEF 100 / _sampleRate
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// MIDI player commands
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#define MIDI_NOTE_OFF 0x8
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#define MIDI_NOTE_ON 0x9
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#define MIDI_CONTROLLER 0xB
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#define MIDI_PROGRAM_CHANGE 0xC
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#define MIDI_PITCH_WHEEL 0xE
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#define MIDI_STOP_SEQUENCE 0xFC
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#define MIDI_TIMER_SYNC 0xF8
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// Size of the SIERRASTANDARD file (i.e. the wave file i.e. the sample data used by the instruments).
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#define SIERRASTANDARD_SIZE 65536
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// Maximum number of instruments in an Apple IIGS instrument set.
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// Chosen empirically based on Apple IIGS AGI game data, increase if needed.
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#define MAX_INSTRUMENTS 28
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// The MIDI player allocates one generator for each note it starts to play.
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// Here the maximum number of generators is defined. Feel free to increase
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// this if it does not seem to be enough.
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#define MAX_GENERATORS 16
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#define ENVELOPE_SEGMENT_COUNT 8
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#define MAX_OSCILLATOR_WAVES 127 // Maximum is one for every MIDI key
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struct IIgsInstrumentHeader {
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struct {
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frac_t bp; ///< Envelope segment breakpoint
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frac_t inc; ///< Envelope segment velocity
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} env[ENVELOPE_SEGMENT_COUNT];
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uint8 seg; ///< Envelope release segment
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uint8 bend; ///< Maximum range for pitch bend
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uint8 vibDepth; ///< Vibrato depth
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uint8 vibSpeed; ///< Vibrato speed
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uint8 waveCount[2]; ///< Wave count for both generators
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struct {
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uint8 key; ///< Highest MIDI key to use this wave
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int offset; ///< Offset of wave data, relative to base
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uint size; ///< Wave size
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bool halt; ///< Oscillator halted?
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bool loop; ///< Loop mode?
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bool swap; ///< Swap mode?
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bool chn; ///< Output channel (left / right)
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int16 tune; ///< Fine tune in semitones (8.8 fixed point)
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} wave[2][MAX_OSCILLATOR_WAVES];
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int8* base; ///< Base of wave data
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/**
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* Read an Apple IIGS instrument header from the given stream.
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* @param stream The source stream from which to read the data.
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* @param ignoreAddr Should we ignore wave infos' wave address variable's value?
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* @return True if successful, false otherwise.
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*/
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bool read(Common::SeekableReadStream &stream, bool ignoreAddr = false);
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bool finalize(int8 *);
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};
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struct IIgsSampleHeader {
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uint16 type;
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uint8 pitch; ///< Logarithmic, base is 2**(1/12), unknown multiplier (Possibly in range 1040-1080)
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uint8 unknownByte_Ofs3; // 0x7F in Gold Rush's sound resource 60, 0 in all others.
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uint8 volume; ///< Current guess: Logarithmic in 6 dB steps
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uint8 unknownByte_Ofs5; ///< 0 in all tested samples.
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uint16 instrumentSize; ///< Little endian. 44 in all tested samples. A guess.
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uint16 sampleSize; ///< Little endian. Accurate in all tested samples excluding Manhunter I's sound resource 16.
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IIgsInstrumentHeader instrument;
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/**
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* Read an Apple IIGS AGI sample header from the given stream.
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* @param stream The source stream from which to read the data.
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* @return True if successful, false otherwise.
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*/
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bool read(Common::SeekableReadStream &stream);
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bool finalize(int8 *sample);
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};
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class IIgsGenerator {
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public:
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IIgsGenerator() : ins(NULL), key(-1), chn(-1) {}
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const IIgsInstrumentHeader *ins; ///< Currently used instrument
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int key; ///< MIDI key
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int vel; ///< MIDI velocity (& channel volume)
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int chn; ///< MIDI channel
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struct {
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int8 *base; ///< Sample base pointer
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uint size; ///< Sample size
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frac_t p; ///< Sample pointer
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frac_t pd; ///< Sample pointer delta
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bool halt; ///< Is oscillator halted?
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bool loop; ///< Is looping enabled?
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bool swap; ///< Is swapping enabled?
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bool chn; ///< Output channel (left / right)
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} osc[2];
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int seg; ///< Current envelope segment
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frac_t a; ///< Current envelope amplitude
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};
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class IIgsMidi : public AgiSound {
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public:
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IIgsMidi(uint8 *data, uint32 len, int resnum);
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~IIgsMidi() { if (_data != NULL) free(_data); }
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virtual uint16 type() { return _type; }
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virtual const uint8 *getPtr() { return _ptr; }
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virtual void setPtr(const uint8 *ptr) { _ptr = ptr; }
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virtual void rewind() { _ptr = _data + 2; _ticks = 0; }
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protected:
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uint8 *_data; ///< Raw sound resource data
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const uint8 *_ptr; ///< Pointer to the current position in the MIDI 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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public:
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uint _ticks; ///< MIDI song position in ticks (1/60ths of a second)
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};
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class IIgsSample : public AgiSound {
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public:
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IIgsSample(uint8 *data, uint32 len, int resnum);
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~IIgsSample() { delete[] _sample; }
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virtual uint16 type() { return _header.type; }
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const IIgsSampleHeader &getHeader() const { return _header; }
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const int8 *getSample() const { return _sample; }
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protected:
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IIgsSampleHeader _header; ///< Apple IIGS AGI sample header
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int8 *_sample; ///< Sample data (8-bit signed format)
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};
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/** Apple IIGS MIDI program change to instrument number mapping. */
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struct IIgsMidiProgramMapping {
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byte midiProgToInst[44]; ///< Lookup table for the MIDI program number to instrument number mapping
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byte undefinedInst; ///< The undefined instrument number
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// Maps the MIDI program number to an instrument number
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byte map(uint midiProg) const {
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return midiProg < ARRAYSIZE(midiProgToInst) ? midiProgToInst[midiProg] : undefinedInst;
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}
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};
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/** Apple IIGS AGI instrument set information. */
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struct IIgsInstrumentSetInfo {
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uint byteCount; ///< Length of the whole instrument set in bytes
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uint instCount; ///< Amount of instrument in the set
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const char *md5; ///< MD5 hex digest of the whole instrument set
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const char *waveFileMd5; ///< MD5 hex digest of the wave file (i.e. the sample data used by the instruments)
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const IIgsMidiProgramMapping *progToInst; ///< Program change to instrument number mapping
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};
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/** Apple IIGS AGI executable file information. */
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struct IIgsExeInfo {
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enum AgiGameID gameid; ///< Game ID
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const char *exePrefix; ///< Prefix of the Apple IIGS AGI executable (e.g. "SQ", "PQ", "KQ4" etc)
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uint agiVer; ///< Apple IIGS AGI version number, not strictly needed
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uint exeSize; ///< Size of the Apple IIGS AGI executable file in bytes
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uint instSetStart; ///< Starting offset of the instrument set inside the executable file
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const IIgsInstrumentSetInfo *instSet; ///< Information about the used instrument set
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};
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class IIgsMidiChannel {
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public:
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IIgsMidiChannel() : _instrument(NULL), _volume(127) {}
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void setInstrument(const IIgsInstrumentHeader *instrument) { _instrument = instrument; }
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const IIgsInstrumentHeader* getInstrument() { return _instrument; }
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void setVolume(int volume) { _volume = volume; }
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int getVolume() { return _volume; }
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private:
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const IIgsInstrumentHeader *_instrument; ///< Instrument used on this MIDI channel
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int _volume; ///< MIDI controller number 7 (Volume)
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};
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class SoundGen2GS : public SoundGen, public Audio::AudioStream {
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public:
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SoundGen2GS(AgiBase *vm, Audio::Mixer *pMixer);
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~SoundGen2GS();
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void play(int resnum);
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void stop(void);
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int readBuffer(int16 *buffer, const int numSamples);
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bool isStereo() const { return true; }
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bool endOfData() const { return false; }
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int getRate() const { return _sampleRate; }
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private:
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// Loader methods
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bool loadInstruments();
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bool loadInstrumentHeaders(Common::String &exePath, const IIgsExeInfo &exeInfo);
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bool loadWaveFile(Common::String &wavePath, const IIgsExeInfo &exeInfo);
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const IIgsExeInfo *getIIgsExeInfo(enum AgiGameID gameid) const;
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void setProgramChangeMapping(const IIgsMidiProgramMapping *mapping);
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// Player methods
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void advancePlayer(); ///< Advance the player
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void advanceMidiPlayer(); ///< Advance MIDI player
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uint generateOutput(); ///< Fill the output buffer
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void haltGenerators(); ///< Halt all generators
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uint activeGenerators(); ///< How many generators are active?
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void midiNoteOff(int channel, int note, int velocity);
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void midiNoteOn(int channel, int note, int velocity);
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double midiKeyToFreq(int key, double finetune);
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IIgsInstrumentHeader* getInstrument(uint8 program) { return &_instruments[_progToInst->map(program)]; }
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IIgsGenerator* allocateGenerator() { IIgsGenerator* g = &_generators[_nextGen++]; _nextGen %= 16; return g; }
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bool _disableMidi; ///< Disable MIDI if loading instruments fail
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int _playingSound; ///< Resource number for the currently playing sound
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bool _playing; ///< True when the resource is still playing
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IIgsGenerator _generators[MAX_GENERATORS]; ///< IIGS sound generators that are used to play single notes
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uint _nextGen; ///< Next generator available for allocation
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IIgsMidiChannel _channels[16]; ///< MIDI channels
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Common::Array<IIgsInstrumentHeader> _instruments; ///< Instrument data
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const IIgsMidiProgramMapping *_progToInst; ///< MIDI program number to instrument mapping
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int8 *_wavetable; ///< Sample data used by the instruments
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uint _ticks; ///< MIDI ticks (60Hz)
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int16 *_out; ///< Output buffer
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uint _outSize; ///< Output buffer size
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static const int kSfxMidiChannel = 15; ///< MIDI channel used for playing sample resources
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};
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} // End of namespace Agi
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#endif /* AGI_SOUND_2GS_H */
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