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-rw-r--r--audio/softsynth/mt32/AReverbModel.cpp277
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diff --git a/audio/softsynth/mt32/AReverbModel.cpp b/audio/softsynth/mt32/AReverbModel.cpp
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--- a/audio/softsynth/mt32/AReverbModel.cpp
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-/* Copyright (C) 2003, 2004, 2005, 2006, 2008, 2009 Dean Beeler, Jerome Fisher
- * Copyright (C) 2011, 2012, 2013 Dean Beeler, Jerome Fisher, Sergey V. Mikayev
- *
- * This program is free software: you can redistribute it and/or modify
- * it under the terms of the GNU Lesser General Public License as published by
- * the Free Software Foundation, either version 2.1 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 Lesser General Public License for more details.
- *
- * You should have received a copy of the GNU Lesser General Public License
- * along with this program. If not, see <http://www.gnu.org/licenses/>.
- */
-
-#include "mt32emu.h"
-
-#if MT32EMU_USE_REVERBMODEL == 1
-
-#include "AReverbModel.h"
-
-// Analysing of state of reverb RAM address lines gives exact sizes of the buffers of filters used. This also indicates that
-// the reverb model implemented in the real devices consists of three series allpass filters preceded by a non-feedback comb (or a delay with a LPF)
-// and followed by three parallel comb filters
-
-namespace MT32Emu {
-
-// Because LA-32 chip makes it's output available to process by the Boss chip with a significant delay,
-// the Boss chip puts to the buffer the LA32 dry output when it is ready and performs processing of the _previously_ latched data.
-// Of course, the right way would be to use a dedicated variable for this, but our reverb model is way higher level,
-// so we can simply increase the input buffer size.
-static const Bit32u PROCESS_DELAY = 1;
-
-// Default reverb settings for modes 0-2. These correspond to CM-32L / LAPC-I "new" reverb settings. MT-32 reverb is a bit different.
-// Found by tracing reverb RAM data lines (thanks go to Lord_Nightmare & balrog).
-
-static const Bit32u NUM_ALLPASSES = 3;
-static const Bit32u NUM_COMBS = 4; // Well, actually there are 3 comb filters, but the entrance LPF + delay can be perfectly processed via a comb here.
-
-static const Bit32u MODE_0_ALLPASSES[] = {994, 729, 78};
-static const Bit32u MODE_0_COMBS[] = {705 + PROCESS_DELAY, 2349, 2839, 3632};
-static const Bit32u MODE_0_OUTL[] = {2349, 141, 1960};
-static const Bit32u MODE_0_OUTR[] = {1174, 1570, 145};
-static const Bit32u MODE_0_COMB_FACTOR[] = {0x3C, 0x60, 0x60, 0x60};
-static const Bit32u MODE_0_COMB_FEEDBACK[] = {0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
- 0x28, 0x48, 0x60, 0x78, 0x80, 0x88, 0x90, 0x98,
- 0x28, 0x48, 0x60, 0x78, 0x80, 0x88, 0x90, 0x98,
- 0x28, 0x48, 0x60, 0x78, 0x80, 0x88, 0x90, 0x98};
-static const Bit32u MODE_0_LEVELS[] = {10*1, 10*3, 10*5, 10*7, 11*9, 11*12, 11*15, 13*15};
-static const Bit32u MODE_0_LPF_AMP = 6;
-
-static const Bit32u MODE_1_ALLPASSES[] = {1324, 809, 176};
-static const Bit32u MODE_1_COMBS[] = {961 + PROCESS_DELAY, 2619, 3545, 4519};
-static const Bit32u MODE_1_OUTL[] = {2618, 1760, 4518};
-static const Bit32u MODE_1_OUTR[] = {1300, 3532, 2274};
-static const Bit32u MODE_1_COMB_FACTOR[] = {0x30, 0x60, 0x60, 0x60};
-static const Bit32u MODE_1_COMB_FEEDBACK[] = {0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
- 0x28, 0x48, 0x60, 0x70, 0x78, 0x80, 0x90, 0x98,
- 0x28, 0x48, 0x60, 0x78, 0x80, 0x88, 0x90, 0x98,
- 0x28, 0x48, 0x60, 0x78, 0x80, 0x88, 0x90, 0x98};
-static const Bit32u MODE_1_LEVELS[] = {10*1, 10*3, 11*5, 11*7, 11*9, 11*12, 11*15, 14*15};
-static const Bit32u MODE_1_LPF_AMP = 6;
-
-static const Bit32u MODE_2_ALLPASSES[] = {969, 644, 157};
-static const Bit32u MODE_2_COMBS[] = {116 + PROCESS_DELAY, 2259, 2839, 3539};
-static const Bit32u MODE_2_OUTL[] = {2259, 718, 1769};
-static const Bit32u MODE_2_OUTR[] = {1136, 2128, 1};
-static const Bit32u MODE_2_COMB_FACTOR[] = {0, 0x20, 0x20, 0x20};
-static const Bit32u MODE_2_COMB_FEEDBACK[] = {0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
- 0x30, 0x58, 0x78, 0x88, 0xA0, 0xB8, 0xC0, 0xD0,
- 0x30, 0x58, 0x78, 0x88, 0xA0, 0xB8, 0xC0, 0xD0,
- 0x30, 0x58, 0x78, 0x88, 0xA0, 0xB8, 0xC0, 0xD0};
-static const Bit32u MODE_2_LEVELS[] = {10*1, 10*3, 11*5, 11*7, 11*9, 11*12, 12*15, 14*15};
-static const Bit32u MODE_2_LPF_AMP = 8;
-
-static const AReverbSettings REVERB_MODE_0_SETTINGS = {MODE_0_ALLPASSES, MODE_0_COMBS, MODE_0_OUTL, MODE_0_OUTR, MODE_0_COMB_FACTOR, MODE_0_COMB_FEEDBACK, MODE_0_LEVELS, MODE_0_LPF_AMP};
-static const AReverbSettings REVERB_MODE_1_SETTINGS = {MODE_1_ALLPASSES, MODE_1_COMBS, MODE_1_OUTL, MODE_1_OUTR, MODE_1_COMB_FACTOR, MODE_1_COMB_FEEDBACK, MODE_1_LEVELS, MODE_1_LPF_AMP};
-static const AReverbSettings REVERB_MODE_2_SETTINGS = {MODE_2_ALLPASSES, MODE_2_COMBS, MODE_2_OUTL, MODE_2_OUTR, MODE_2_COMB_FACTOR, MODE_2_COMB_FEEDBACK, MODE_2_LEVELS, MODE_2_LPF_AMP};
-
-static const AReverbSettings * const REVERB_SETTINGS[] = {&REVERB_MODE_0_SETTINGS, &REVERB_MODE_1_SETTINGS, &REVERB_MODE_2_SETTINGS, &REVERB_MODE_0_SETTINGS};
-
-RingBuffer::RingBuffer(const Bit32u newsize) : size(newsize), index(0) {
- buffer = new float[size];
-}
-
-RingBuffer::~RingBuffer() {
- delete[] buffer;
- buffer = NULL;
-}
-
-float RingBuffer::next() {
- if (++index >= size) {
- index = 0;
- }
- return buffer[index];
-}
-
-bool RingBuffer::isEmpty() const {
- if (buffer == NULL) return true;
-
- float *buf = buffer;
- float max = 0.001f;
- for (Bit32u i = 0; i < size; i++) {
- if ((*buf < -max) || (*buf > max)) return false;
- buf++;
- }
- return true;
-}
-
-void RingBuffer::mute() {
- float *buf = buffer;
- for (Bit32u i = 0; i < size; i++) {
- *buf++ = 0;
- }
-}
-
-AllpassFilter::AllpassFilter(const Bit32u useSize) : RingBuffer(useSize) {}
-
-float AllpassFilter::process(const float in) {
- // This model corresponds to the allpass filter implementation of the real CM-32L device
- // found from sample analysis
-
- const float bufferOut = next();
-
- // store input - feedback / 2
- buffer[index] = in - 0.5f * bufferOut;
-
- // return buffer output + feedforward / 2
- return bufferOut + 0.5f * buffer[index];
-}
-
-CombFilter::CombFilter(const Bit32u useSize) : RingBuffer(useSize) {}
-
-void CombFilter::process(const float in) {
- // This model corresponds to the comb filter implementation of the real CM-32L device
- // found from sample analysis
-
- // the previously stored value
- float last = buffer[index];
-
- // prepare input + feedback
- float filterIn = in + next() * feedbackFactor;
-
- // store input + feedback processed by a low-pass filter
- buffer[index] = filterFactor * last - filterIn;
-}
-
-float CombFilter::getOutputAt(const Bit32u outIndex) const {
- return buffer[(size + index - outIndex) % size];
-}
-
-void CombFilter::setFeedbackFactor(const float useFeedbackFactor) {
- feedbackFactor = useFeedbackFactor;
-}
-
-void CombFilter::setFilterFactor(const float useFilterFactor) {
- filterFactor = useFilterFactor;
-}
-
-AReverbModel::AReverbModel(const ReverbMode mode) : allpasses(NULL), combs(NULL), currentSettings(*REVERB_SETTINGS[mode]) {}
-
-AReverbModel::~AReverbModel() {
- close();
-}
-
-void AReverbModel::open() {
- allpasses = new AllpassFilter*[NUM_ALLPASSES];
- for (Bit32u i = 0; i < NUM_ALLPASSES; i++) {
- allpasses[i] = new AllpassFilter(currentSettings.allpassSizes[i]);
- }
- combs = new CombFilter*[NUM_COMBS];
- for (Bit32u i = 0; i < NUM_COMBS; i++) {
- combs[i] = new CombFilter(currentSettings.combSizes[i]);
- combs[i]->setFilterFactor(currentSettings.filterFactor[i] / 256.0f);
- }
- lpfAmp = currentSettings.lpfAmp / 16.0f;
- mute();
-}
-
-void AReverbModel::close() {
- if (allpasses != NULL) {
- for (Bit32u i = 0; i < NUM_ALLPASSES; i++) {
- if (allpasses[i] != NULL) {
- delete allpasses[i];
- allpasses[i] = NULL;
- }
- }
- delete[] allpasses;
- allpasses = NULL;
- }
- if (combs != NULL) {
- for (Bit32u i = 0; i < NUM_COMBS; i++) {
- if (combs[i] != NULL) {
- delete combs[i];
- combs[i] = NULL;
- }
- }
- delete[] combs;
- combs = NULL;
- }
-}
-
-void AReverbModel::mute() {
- if (allpasses == NULL || combs == NULL) return;
- for (Bit32u i = 0; i < NUM_ALLPASSES; i++) {
- allpasses[i]->mute();
- }
- for (Bit32u i = 0; i < NUM_COMBS; i++) {
- combs[i]->mute();
- }
-}
-
-void AReverbModel::setParameters(Bit8u time, Bit8u level) {
-// FIXME: wetLevel definitely needs ramping when changed
-// Although, most games don't set reverb level during MIDI playback
- if (combs == NULL) return;
- level &= 7;
- time &= 7;
- for (Bit32u i = 0; i < NUM_COMBS; i++) {
- combs[i]->setFeedbackFactor(currentSettings.decayTimes[(i << 3) + time] / 256.0f);
- }
- wetLevel = (level == 0 && time == 0) ? 0.0f : 0.5f * lpfAmp * currentSettings.wetLevels[level] / 256.0f;
-}
-
-bool AReverbModel::isActive() const {
- for (Bit32u i = 0; i < NUM_ALLPASSES; i++) {
- if (!allpasses[i]->isEmpty()) return true;
- }
- for (Bit32u i = 0; i < NUM_COMBS; i++) {
- if (!combs[i]->isEmpty()) return true;
- }
- return false;
-}
-
-void AReverbModel::process(const float *inLeft, const float *inRight, float *outLeft, float *outRight, unsigned long numSamples) {
- float dry, link, outL1;
-
- for (unsigned long i = 0; i < numSamples; i++) {
- dry = wetLevel * (*inLeft + *inRight);
-
- // Get the last stored sample before processing in order not to loose it
- link = combs[0]->getOutputAt(currentSettings.combSizes[0] - 1);
-
- combs[0]->process(-dry);
-
- link = allpasses[0]->process(link);
- link = allpasses[1]->process(link);
- link = allpasses[2]->process(link);
-
- // If the output position is equal to the comb size, get it now in order not to loose it
- outL1 = 1.5f * combs[1]->getOutputAt(currentSettings.outLPositions[0] - 1);
-
- combs[1]->process(link);
- combs[2]->process(link);
- combs[3]->process(link);
-
- link = outL1 + 1.5f * combs[2]->getOutputAt(currentSettings.outLPositions[1]);
- link += combs[3]->getOutputAt(currentSettings.outLPositions[2]);
- *outLeft = link;
-
- link = 1.5f * combs[1]->getOutputAt(currentSettings.outRPositions[0]);
- link += 1.5f * combs[2]->getOutputAt(currentSettings.outRPositions[1]);
- link += combs[3]->getOutputAt(currentSettings.outRPositions[2]);
- *outRight = link;
-
- inLeft++;
- inRight++;
- outLeft++;
- outRight++;
- }
-}
-
-}
-
-#endif
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