mirror of
https://github.com/libretro/scummvm.git
synced 2025-01-31 07:53:36 +00:00
added MidiDriver_Emulated base class used by the adlib & ym2612 midi 'drivers'
svn-id: r15589
This commit is contained in:
Max Horn
parent
649eb19a3e
commit
267144e69c
@ -18,15 +18,9 @@
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* $Header$
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*/
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#include "stdafx.h"
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#include "sound/audiostream.h"
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#include "sound/mididrv.h"
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#include "sound/fmopl.h"
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#include "sound/mixer.h"
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#include "emumidi.h"
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#include "common/util.h"
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#define BASE_FREQ 250
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#define FIXP_SHIFT 16
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#include "sound/fmopl.h"
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#ifdef DEBUG_ADLIB
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static int tick;
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@ -544,7 +538,7 @@ static void create_lookup_table() {
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//
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////////////////////////////////////////
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class MidiDriver_ADLIB : public AudioStream, public MidiDriver {
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class MidiDriver_ADLIB : public MidiDriver_Emulated {
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friend class AdlibPart;
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friend class AdlibPercussionChannel;
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@ -554,51 +548,30 @@ public:
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int open();
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void close();
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void send(uint32 b);
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void send (byte channel, uint32 b); // Supports higher than channel 15
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void send(byte channel, uint32 b); // Supports higher than channel 15
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uint32 property(int prop, uint32 param);
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void setPitchBendRange(byte channel, uint range);
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void sysEx_customInstrument(byte channel, uint32 type, byte *instr);
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void setTimerCallback(void *timer_param, Timer::TimerProc timer_proc);
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uint32 getBaseTempo() {
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return 1000000 / BASE_FREQ;
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}
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MidiChannel *allocateChannel();
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MidiChannel *getPercussionChannel() { return &_percussion; } // Percussion partially supported
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// AudioStream API
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int readBuffer(int16 *buffer, const int numSamples) {
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memset(buffer, 0, 2 * numSamples); // FIXME
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generate_samples(buffer, numSamples);
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return numSamples;
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}
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int16 read() {
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error("ProcInputStream::read not supported");
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}
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bool isStereo() const { return false; }
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bool endOfData() const { return false; }
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int getRate() const { return _mixer->getOutputRate(); }
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private:
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bool _isOpen;
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bool _game_SmallHeader;
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FM_OPL *_opl;
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byte *_adlib_reg_cache;
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SoundMixer *_mixer;
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Timer::TimerProc _timer_proc;
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void *_timer_param;
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int _adlib_timer_counter;
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uint16 channel_table_2[9];
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int _voice_index;
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int _next_tick;
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int _samples_per_tick;
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int _timer_p;
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int _timer_q;
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uint16 curnote_table[9];
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@ -820,20 +793,15 @@ void AdlibPercussionChannel::noteOn(byte note, byte velocity) {
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// MidiDriver method implementations
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MidiDriver_ADLIB::MidiDriver_ADLIB(SoundMixer *mixer)
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: _mixer(mixer) {
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: MidiDriver_Emulated(mixer) {
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uint i;
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_isOpen = false;
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_game_SmallHeader = false;
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_adlib_reg_cache = 0;
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_timer_proc = 0;
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_timer_param = 0;
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_adlib_timer_counter = 0;
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_voice_index = 0;
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_next_tick = 0;
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for (i = 0; i < ARRAYSIZE(curnote_table); ++i) {
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curnote_table[i] = 0;
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}
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@ -849,7 +817,8 @@ MidiDriver_ADLIB::MidiDriver_ADLIB(SoundMixer *mixer)
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int MidiDriver_ADLIB::open() {
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if (_isOpen)
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return MERR_ALREADY_OPEN;
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_isOpen = true;
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MidiDriver_Emulated::open();
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int i;
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AdlibVoice *voice;
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@ -869,8 +838,6 @@ int MidiDriver_ADLIB::open() {
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adlib_write(0xBD, 0x00);
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create_lookup_table();
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_samples_per_tick = (getRate() << FIXP_SHIFT) / BASE_FREQ;
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_mixer->setupPremix(this);
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return 0;
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@ -879,6 +846,10 @@ int MidiDriver_ADLIB::open() {
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void MidiDriver_ADLIB::close() {
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if (!_isOpen)
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return;
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_isOpen = false;
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// Detach the premix callback handler
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_mixer->setupPremix(0);
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uint i;
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for (i = 0; i < ARRAYSIZE(_voices); ++i) {
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@ -886,15 +857,10 @@ void MidiDriver_ADLIB::close() {
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mc_off(&_voices [i]);
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}
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// Detach the premix callback handler
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_mixer->setupPremix(0);
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// Turn off the OPL emulation
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// YM3812Shutdown();
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free(_adlib_reg_cache);
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_isOpen = false;
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}
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void MidiDriver_ADLIB::send (uint32 b) {
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@ -976,11 +942,6 @@ void MidiDriver_ADLIB::sysEx_customInstrument(byte channel, uint32 type, byte *i
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_parts[channel].sysEx_customInstrument(type, instr);
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}
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void MidiDriver_ADLIB::setTimerCallback(void *timer_param, Timer::TimerProc timer_proc) {
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_timer_proc = timer_proc;
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_timer_param = timer_param;
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}
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MidiChannel *MidiDriver_ADLIB::allocateChannel() {
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AdlibPart *part;
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uint i;
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@ -1013,24 +974,8 @@ void MidiDriver_ADLIB::adlib_write(byte port, byte value) {
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}
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void MidiDriver_ADLIB::generate_samples(int16 *data, int len) {
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int step;
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do {
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step = len;
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if (step > (_next_tick >> FIXP_SHIFT))
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step = (_next_tick >> FIXP_SHIFT);
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YM3812UpdateOne(_opl, data, step);
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_next_tick -= step << FIXP_SHIFT;
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if (!(_next_tick >> FIXP_SHIFT)) {
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if (_timer_proc)
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(*_timer_proc)(_timer_param);
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on_timer();
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_next_tick += _samples_per_tick;
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}
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data += step;
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len -= step;
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} while (len);
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memset(data, 0, sizeof(int16) * len);
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YM3812UpdateOne(_opl, data, len);
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}
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void MidiDriver_ADLIB::on_timer() {
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96
backends/midi/emumidi.h
Normal file
96
backends/midi/emumidi.h
Normal file
@ -0,0 +1,96 @@
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/* ScummVM - Scumm Interpreter
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* Copyright (C) 2001-2004 The ScummVM project
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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., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
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*
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* $Header$
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*/
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#include "stdafx.h"
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#include "sound/audiostream.h"
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#include "sound/mididrv.h"
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#include "sound/mixer.h"
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#define BASE_FREQ 250
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#define FIXP_SHIFT 16
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class MidiDriver_Emulated : public AudioStream, public MidiDriver {
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protected:
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bool _isOpen;
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SoundMixer *_mixer;
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private:
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Timer::TimerProc _timer_proc;
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void *_timer_param;
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int _next_tick;
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int _samples_per_tick;
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protected:
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virtual void generate_samples(int16 *buf, int len) = 0;
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public:
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MidiDriver_Emulated(SoundMixer *mixer) : _mixer(mixer) {
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_isOpen = false;
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_timer_proc = 0;
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_timer_param = 0;
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_next_tick = 0;
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_samples_per_tick = 0;
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}
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int open() {
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_isOpen = true;
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_samples_per_tick = (getRate() << FIXP_SHIFT) / BASE_FREQ;
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}
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void setTimerCallback(void *timer_param, Timer::TimerProc timer_proc) {
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_timer_proc = timer_proc;
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_timer_param = timer_param;
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}
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uint32 getBaseTempo() { return 1000000 / BASE_FREQ; }
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// AudioStream API
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int readBuffer(int16 *data, const int numSamples) {
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const int stereoFactor = isStereo() ? 2 : 1;
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int len = numSamples / stereoFactor;
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int step;
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do {
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step = len;
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if (step > (_next_tick >> FIXP_SHIFT))
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step = (_next_tick >> FIXP_SHIFT);
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generate_samples(data, step);
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_next_tick -= step << FIXP_SHIFT;
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if (!(_next_tick >> FIXP_SHIFT)) {
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if (_timer_proc)
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(*_timer_proc)(_timer_param);
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_next_tick += _samples_per_tick;
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}
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data += step * stereoFactor;
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len -= step;
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} while (len);
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return numSamples;
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}
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int16 read() {
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error("ProcInputStream::read not supported");
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}
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bool endOfData() const { return false; }
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};
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@ -22,11 +22,7 @@
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* $Header$
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*/
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#include "stdafx.h"
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#include "common/util.h"
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#include "sound/audiostream.h"
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#include "sound/mididrv.h"
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#include "sound/mixer.h"
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#include "emumidi.h"
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#include <math.h>
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@ -37,9 +33,6 @@
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//
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////////////////////////////////////////
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#define BASE_FREQ 250
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#define FIXP_SHIFT 16
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static int *sintbl = 0;
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static int *powtbl = 0;
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static int *frequencyTable = 0;
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@ -158,20 +151,13 @@ public:
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void sysEx_customInstrument(uint32 type, byte *instr);
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};
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class MidiDriver_YM2612 : public AudioStream, public MidiDriver {
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class MidiDriver_YM2612 : public MidiDriver_Emulated {
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protected:
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MidiChannel_YM2612 *_channel[16];
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int _next_voice;
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int _volume;
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bool _isOpen;
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SoundMixer *_mixer;
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Timer::TimerProc _timer_proc;
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void *_timer_param;
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int _next_tick;
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int _samples_per_tick;
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protected:
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static void createLookupTables();
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void nextTick(int16 *buf1, int buflen);
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@ -193,25 +179,12 @@ public:
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void setPitchBendRange(byte channel, uint range) { }
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void sysEx(byte *msg, uint16 length);
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void setTimerCallback(void *timer_param, Timer::TimerProc timer_proc);
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uint32 getBaseTempo() { return 1000000 / BASE_FREQ; }
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MidiChannel *allocateChannel() { return 0; }
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MidiChannel *getPercussionChannel() { return 0; }
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// AudioStream API
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int readBuffer(int16 *buffer, const int numSamples) {
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memset(buffer, 0, 2 * numSamples); // FIXME
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generate_samples(buffer, numSamples / 2);
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return numSamples;
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}
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int16 read() {
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error("ProcInputStream::read not supported");
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}
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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 _mixer->getOutputRate(); }
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};
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@ -736,13 +709,8 @@ void MidiChannel_YM2612::rate(uint16 r) {
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//
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////////////////////////////////////////
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MidiDriver_YM2612::MidiDriver_YM2612(SoundMixer *mixer) :
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_mixer(mixer) {
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_isOpen = false;
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_timer_proc = 0;
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_timer_param = 0;
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_next_tick = 0;
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_samples_per_tick = (getRate() << FIXP_SHIFT) / BASE_FREQ;
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MidiDriver_YM2612::MidiDriver_YM2612(SoundMixer *mixer)
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: MidiDriver_Emulated(mixer) {
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_next_voice = 0;
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createLookupTables();
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@ -769,8 +737,10 @@ MidiDriver_YM2612::~MidiDriver_YM2612() {
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int MidiDriver_YM2612::open() {
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if (_isOpen)
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return MERR_ALREADY_OPEN;
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MidiDriver_Emulated::open();
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_mixer->setupPremix(this);
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_isOpen = true;
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return 0;
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}
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@ -783,11 +753,6 @@ void MidiDriver_YM2612::close() {
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_mixer->setupPremix(0);
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}
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void MidiDriver_YM2612::setTimerCallback(void *timer_param, Timer::TimerProc timer_proc) {
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_timer_proc = timer_proc;
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_timer_param = timer_param;
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}
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void MidiDriver_YM2612::send(uint32 b) {
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send(b & 0xF, b & 0xFFFFFFF0);
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}
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@ -838,23 +803,8 @@ void MidiDriver_YM2612::sysEx(byte *msg, uint16 length) {
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}
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void MidiDriver_YM2612::generate_samples(int16 *data, int len) {
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int step;
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do {
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step = len;
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if (step > (_next_tick >> FIXP_SHIFT))
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step = (_next_tick >> FIXP_SHIFT);
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nextTick(data, step);
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_next_tick -= step << FIXP_SHIFT;
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if (!(_next_tick >> FIXP_SHIFT)) {
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if (_timer_proc)
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(*_timer_proc)(_timer_param);
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_next_tick += _samples_per_tick;
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}
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data += step * 2; // Stereo means * 2
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len -= step;
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} while (len);
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memset(data, 0, 2 * sizeof(int16) * len);
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nextTick(data, len);
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}
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void MidiDriver_YM2612::nextTick(int16 *buf1, int buflen) {
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