From 00992c1e68444a8123ffc89a971751cecf7287ed Mon Sep 17 00:00:00 2001
From: Filippos Karapetis
Date: Wed, 21 Aug 2013 03:41:30 +0300
Subject: MT-32: Sync with the latest changes in munt
---
audio/softsynth/mt32/DelayReverb.cpp | 142 -----------------------------------
1 file changed, 142 deletions(-)
delete mode 100644 audio/softsynth/mt32/DelayReverb.cpp
(limited to 'audio/softsynth/mt32/DelayReverb.cpp')
diff --git a/audio/softsynth/mt32/DelayReverb.cpp b/audio/softsynth/mt32/DelayReverb.cpp
deleted file mode 100644
index d80c98acbc..0000000000
--- a/audio/softsynth/mt32/DelayReverb.cpp
+++ /dev/null
@@ -1,142 +0,0 @@
-/* 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 .
- */
-
-//#include
-//#include
-#include "mt32emu.h"
-#include "DelayReverb.h"
-
-namespace MT32Emu {
-
-// CONFIRMED: The values below are found via analysis of digital samples and tracing reverb RAM address / data lines. Checked with all time and level combinations.
-// Obviously:
-// rightDelay = (leftDelay - 2) * 2 + 2
-// echoDelay = rightDelay - 1
-// Leaving these separate in case it's useful for work on other reverb modes...
-static const Bit32u REVERB_TIMINGS[8][3]= {
- // {leftDelay, rightDelay, feedbackDelay}
- {402, 802, 801},
- {626, 1250, 1249},
- {962, 1922, 1921},
- {1490, 2978, 2977},
- {2258, 4514, 4513},
- {3474, 6946, 6945},
- {5282, 10562, 10561},
- {8002, 16002, 16001}
-};
-
-// Reverb amp is found as dryAmp * wetAmp
-static const Bit32u REVERB_AMP[8] = {0x20*0x18, 0x50*0x18, 0x50*0x28, 0x50*0x40, 0x50*0x60, 0x50*0x80, 0x50*0xA8, 0x50*0xF8};
-static const Bit32u REVERB_FEEDBACK67 = 0x60;
-static const Bit32u REVERB_FEEDBACK = 0x68;
-static const float LPF_VALUE = 0x68 / 256.0f;
-
-static const Bit32u BUFFER_SIZE = 16384;
-
-DelayReverb::DelayReverb() {
- buf = NULL;
- setParameters(0, 0);
-}
-
-DelayReverb::~DelayReverb() {
- delete[] buf;
-}
-
-void DelayReverb::open() {
- if (buf == NULL) {
- delete[] buf;
-
- buf = new float[BUFFER_SIZE];
-
- recalcParameters();
-
- // mute buffer
- bufIx = 0;
- if (buf != NULL) {
- for (unsigned int i = 0; i < BUFFER_SIZE; i++) {
- buf[i] = 0.0f;
- }
- }
- }
-}
-
-void DelayReverb::close() {
- delete[] buf;
- buf = NULL;
-}
-
-// This method will always trigger a flush of the buffer
-void DelayReverb::setParameters(Bit8u newTime, Bit8u newLevel) {
- time = newTime;
- level = newLevel;
- recalcParameters();
-}
-
-void DelayReverb::recalcParameters() {
- // Number of samples between impulse and eventual appearance on the left channel
- delayLeft = REVERB_TIMINGS[time][0];
- // Number of samples between impulse and eventual appearance on the right channel
- delayRight = REVERB_TIMINGS[time][1];
- // Number of samples between a response and that response feeding back/echoing
- delayFeedback = REVERB_TIMINGS[time][2];
-
- if (level < 3 || time < 6) {
- feedback = REVERB_FEEDBACK / 256.0f;
- } else {
- feedback = REVERB_FEEDBACK67 / 256.0f;
- }
-
- // Overall output amp
- amp = (level == 0 && time == 0) ? 0.0f : REVERB_AMP[level] / 65536.0f;
-}
-
-void DelayReverb::process(const float *inLeft, const float *inRight, float *outLeft, float *outRight, unsigned long numSamples) {
- if (buf == NULL) return;
-
- for (unsigned int sampleIx = 0; sampleIx < numSamples; sampleIx++) {
- // The ring buffer write index moves backwards; reads are all done with positive offsets.
- Bit32u bufIxPrev = (bufIx + 1) % BUFFER_SIZE;
- Bit32u bufIxLeft = (bufIx + delayLeft) % BUFFER_SIZE;
- Bit32u bufIxRight = (bufIx + delayRight) % BUFFER_SIZE;
- Bit32u bufIxFeedback = (bufIx + delayFeedback) % BUFFER_SIZE;
-
- // Attenuated input samples and feedback response are directly added to the current ring buffer location
- float lpfIn = amp * (inLeft[sampleIx] + inRight[sampleIx]) + feedback * buf[bufIxFeedback];
-
- // Single-pole IIR filter found on real devices
- buf[bufIx] = buf[bufIxPrev] * LPF_VALUE - lpfIn;
-
- outLeft[sampleIx] = buf[bufIxLeft];
- outRight[sampleIx] = buf[bufIxRight];
-
- bufIx = (BUFFER_SIZE + bufIx - 1) % BUFFER_SIZE;
- }
-}
-
-bool DelayReverb::isActive() const {
- if (buf == NULL) return false;
-
- float *b = buf;
- float max = 0.001f;
- for (Bit32u i = 0; i < BUFFER_SIZE; i++) {
- if ((*b < -max) || (*b > max)) return true;
- b++;
- }
- return false;
-}
-
-}
--
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