From ef79bbde537d6b9c745a7d86cb9df1d04c35590d Mon Sep 17 00:00:00 2001 From: PCSX* teams Date: Tue, 16 Nov 2010 14:15:22 +0200 Subject: pcsxr-1.9.92 --- plugins/dfsound/adsr.c | 641 +++++++++++++++++++++++++++++++++++++++++++++++++ 1 file changed, 641 insertions(+) create mode 100644 plugins/dfsound/adsr.c (limited to 'plugins/dfsound/adsr.c') diff --git a/plugins/dfsound/adsr.c b/plugins/dfsound/adsr.c new file mode 100644 index 0000000..2496e46 --- /dev/null +++ b/plugins/dfsound/adsr.c @@ -0,0 +1,641 @@ +/*************************************************************************** + adsr.c - description + ------------------- + begin : Wed May 15 2002 + copyright : (C) 2002 by Pete Bernert + email : BlackDove@addcom.de + ***************************************************************************/ +/*************************************************************************** + * * + * This program is free software; you can redistribute it and/or modify * + * it under the terms of the GNU General Public License as published by * + * the Free Software Foundation; either version 2 of the License, or * + * (at your option) any later version. See also the license.txt file for * + * additional informations. * + * * + ***************************************************************************/ + +#include "stdafx.h" + +#define _IN_ADSR + +// will be included from spu.c +#ifdef _IN_SPU + +//////////////////////////////////////////////////////////////////////// +// ADSR func +//////////////////////////////////////////////////////////////////////// + +unsigned long RateTable[160]; + +void InitADSR(void) // INIT ADSR +{ + unsigned long r,rs,rd;int i; + + memset(RateTable,0,sizeof(unsigned long)*160); // build the rate table according to Neill's rules (see at bottom of file) + + r=3;rs=1;rd=0; + + for(i=32;i<160;i++) // we start at pos 32 with the real values... everything before is 0 + { + if(r<0x3FFFFFFF) + { + r+=rs; + rd++;if(rd==5) {rd=1;rs*=2;} + } + if(r>0x3FFFFFFF) r=0x3FFFFFFF; + + RateTable[i]=r; + } +} + +//////////////////////////////////////////////////////////////////////// + +INLINE void StartADSR(int ch) // MIX ADSR +{ + s_chan[ch].ADSRX.lVolume=1; // and init some adsr vars + s_chan[ch].ADSRX.State=0; + s_chan[ch].ADSRX.EnvelopeVol=0; +} + +//////////////////////////////////////////////////////////////////////// + +INLINE int MixADSR(int ch) // MIX ADSR +{ + if(s_chan[ch].bStop) // should be stopped: + { // do release + if(s_chan[ch].ADSRX.ReleaseModeExp) + { + switch((s_chan[ch].ADSRX.EnvelopeVol>>28)&0x7) + { + case 0: s_chan[ch].ADSRX.EnvelopeVol-=RateTable[(4*(s_chan[ch].ADSRX.ReleaseRate^0x1F))-0x18 +0 + 32]; break; + case 1: s_chan[ch].ADSRX.EnvelopeVol-=RateTable[(4*(s_chan[ch].ADSRX.ReleaseRate^0x1F))-0x18 +4 + 32]; break; + case 2: s_chan[ch].ADSRX.EnvelopeVol-=RateTable[(4*(s_chan[ch].ADSRX.ReleaseRate^0x1F))-0x18 +6 + 32]; break; + case 3: s_chan[ch].ADSRX.EnvelopeVol-=RateTable[(4*(s_chan[ch].ADSRX.ReleaseRate^0x1F))-0x18 +8 + 32]; break; + case 4: s_chan[ch].ADSRX.EnvelopeVol-=RateTable[(4*(s_chan[ch].ADSRX.ReleaseRate^0x1F))-0x18 +9 + 32]; break; + case 5: s_chan[ch].ADSRX.EnvelopeVol-=RateTable[(4*(s_chan[ch].ADSRX.ReleaseRate^0x1F))-0x18 +10+ 32]; break; + case 6: s_chan[ch].ADSRX.EnvelopeVol-=RateTable[(4*(s_chan[ch].ADSRX.ReleaseRate^0x1F))-0x18 +11+ 32]; break; + case 7: s_chan[ch].ADSRX.EnvelopeVol-=RateTable[(4*(s_chan[ch].ADSRX.ReleaseRate^0x1F))-0x18 +12+ 32]; break; + } + } + else + { + s_chan[ch].ADSRX.EnvelopeVol-=RateTable[(4*(s_chan[ch].ADSRX.ReleaseRate^0x1F))-0x0C + 32]; + } + + if(s_chan[ch].ADSRX.EnvelopeVol<0) + { + s_chan[ch].ADSRX.EnvelopeVol=0; + s_chan[ch].bOn=0; + //s_chan[ch].bReverb=0; + //s_chan[ch].bNoise=0; + } + + s_chan[ch].ADSRX.lVolume=s_chan[ch].ADSRX.EnvelopeVol>>21; + return s_chan[ch].ADSRX.lVolume; + } + else // not stopped yet? + { + if(s_chan[ch].ADSRX.State==0) // -> attack + { + if(s_chan[ch].ADSRX.AttackModeExp) + { + if(s_chan[ch].ADSRX.EnvelopeVol<0x60000000) + s_chan[ch].ADSRX.EnvelopeVol+=RateTable[(s_chan[ch].ADSRX.AttackRate^0x7F)-0x10 + 32]; + else + s_chan[ch].ADSRX.EnvelopeVol+=RateTable[(s_chan[ch].ADSRX.AttackRate^0x7F)-0x18 + 32]; + } + else + { + s_chan[ch].ADSRX.EnvelopeVol+=RateTable[(s_chan[ch].ADSRX.AttackRate^0x7F)-0x10 + 32]; + } + + if(s_chan[ch].ADSRX.EnvelopeVol<0) + { + s_chan[ch].ADSRX.EnvelopeVol=0x7FFFFFFF; + s_chan[ch].ADSRX.State=1; + } + + s_chan[ch].ADSRX.lVolume=s_chan[ch].ADSRX.EnvelopeVol>>21; + return s_chan[ch].ADSRX.lVolume; + } + //--------------------------------------------------// + if(s_chan[ch].ADSRX.State==1) // -> decay + { + switch((s_chan[ch].ADSRX.EnvelopeVol>>28)&0x7) + { + case 0: s_chan[ch].ADSRX.EnvelopeVol-=RateTable[(4*(s_chan[ch].ADSRX.DecayRate^0x1F))-0x18+0 + 32]; break; + case 1: s_chan[ch].ADSRX.EnvelopeVol-=RateTable[(4*(s_chan[ch].ADSRX.DecayRate^0x1F))-0x18+4 + 32]; break; + case 2: s_chan[ch].ADSRX.EnvelopeVol-=RateTable[(4*(s_chan[ch].ADSRX.DecayRate^0x1F))-0x18+6 + 32]; break; + case 3: s_chan[ch].ADSRX.EnvelopeVol-=RateTable[(4*(s_chan[ch].ADSRX.DecayRate^0x1F))-0x18+8 + 32]; break; + case 4: s_chan[ch].ADSRX.EnvelopeVol-=RateTable[(4*(s_chan[ch].ADSRX.DecayRate^0x1F))-0x18+9 + 32]; break; + case 5: s_chan[ch].ADSRX.EnvelopeVol-=RateTable[(4*(s_chan[ch].ADSRX.DecayRate^0x1F))-0x18+10+ 32]; break; + case 6: s_chan[ch].ADSRX.EnvelopeVol-=RateTable[(4*(s_chan[ch].ADSRX.DecayRate^0x1F))-0x18+11+ 32]; break; + case 7: s_chan[ch].ADSRX.EnvelopeVol-=RateTable[(4*(s_chan[ch].ADSRX.DecayRate^0x1F))-0x18+12+ 32]; break; + } + + if(s_chan[ch].ADSRX.EnvelopeVol<0) s_chan[ch].ADSRX.EnvelopeVol=0; + if(((s_chan[ch].ADSRX.EnvelopeVol>>27)&0xF) <= s_chan[ch].ADSRX.SustainLevel) + { + s_chan[ch].ADSRX.State=2; + } + + s_chan[ch].ADSRX.lVolume=s_chan[ch].ADSRX.EnvelopeVol>>21; + return s_chan[ch].ADSRX.lVolume; + } + //--------------------------------------------------// + if(s_chan[ch].ADSRX.State==2) // -> sustain + { + if(s_chan[ch].ADSRX.SustainIncrease) + { + if(s_chan[ch].ADSRX.SustainModeExp) + { + if(s_chan[ch].ADSRX.EnvelopeVol<0x60000000) + s_chan[ch].ADSRX.EnvelopeVol+=RateTable[(s_chan[ch].ADSRX.SustainRate^0x7F)-0x10 + 32]; + else + s_chan[ch].ADSRX.EnvelopeVol+=RateTable[(s_chan[ch].ADSRX.SustainRate^0x7F)-0x18 + 32]; + } + else + { + s_chan[ch].ADSRX.EnvelopeVol+=RateTable[(s_chan[ch].ADSRX.SustainRate^0x7F)-0x10 + 32]; + } + + if(s_chan[ch].ADSRX.EnvelopeVol<0) + { + s_chan[ch].ADSRX.EnvelopeVol=0x7FFFFFFF; + } + } + else + { + if(s_chan[ch].ADSRX.SustainModeExp) + { + switch((s_chan[ch].ADSRX.EnvelopeVol>>28)&0x7) + { + case 0: s_chan[ch].ADSRX.EnvelopeVol-=RateTable[((s_chan[ch].ADSRX.SustainRate^0x7F))-0x1B +0 + 32];break; + case 1: s_chan[ch].ADSRX.EnvelopeVol-=RateTable[((s_chan[ch].ADSRX.SustainRate^0x7F))-0x1B +4 + 32];break; + case 2: s_chan[ch].ADSRX.EnvelopeVol-=RateTable[((s_chan[ch].ADSRX.SustainRate^0x7F))-0x1B +6 + 32];break; + case 3: s_chan[ch].ADSRX.EnvelopeVol-=RateTable[((s_chan[ch].ADSRX.SustainRate^0x7F))-0x1B +8 + 32];break; + case 4: s_chan[ch].ADSRX.EnvelopeVol-=RateTable[((s_chan[ch].ADSRX.SustainRate^0x7F))-0x1B +9 + 32];break; + case 5: s_chan[ch].ADSRX.EnvelopeVol-=RateTable[((s_chan[ch].ADSRX.SustainRate^0x7F))-0x1B +10+ 32];break; + case 6: s_chan[ch].ADSRX.EnvelopeVol-=RateTable[((s_chan[ch].ADSRX.SustainRate^0x7F))-0x1B +11+ 32];break; + case 7: s_chan[ch].ADSRX.EnvelopeVol-=RateTable[((s_chan[ch].ADSRX.SustainRate^0x7F))-0x1B +12+ 32];break; + } + } + else + { + s_chan[ch].ADSRX.EnvelopeVol-=RateTable[((s_chan[ch].ADSRX.SustainRate^0x7F))-0x0F + 32]; + } + + if(s_chan[ch].ADSRX.EnvelopeVol<0) + { + s_chan[ch].ADSRX.EnvelopeVol=0; + } + } + s_chan[ch].ADSRX.lVolume=s_chan[ch].ADSRX.EnvelopeVol>>21; + return s_chan[ch].ADSRX.lVolume; + } + } + return 0; +} + +#endif + +/* +James Higgs ADSR investigations: + +PSX SPU Envelope Timings +~~~~~~~~~~~~~~~~~~~~~~~~ + +First, here is an extract from doomed's SPU doc, which explains the basics +of the SPU "volume envelope": + +*** doomed doc extract start *** + +-------------------------------------------------------------------------- +Voices. +-------------------------------------------------------------------------- +The SPU has 24 hardware voices. These voices can be used to reproduce sample +data, noise or can be used as frequency modulator on the next voice. +Each voice has it's own programmable ADSR envelope filter. The main volume +can be programmed independently for left and right output. + +The ADSR envelope filter works as follows: +Ar = Attack rate, which specifies the speed at which the volume increases + from zero to it's maximum value, as soon as the note on is given. The + slope can be set to lineair or exponential. +Dr = Decay rate specifies the speed at which the volume decreases to the + sustain level. Decay is always decreasing exponentially. +Sl = Sustain level, base level from which sustain starts. +Sr = Sustain rate is the rate at which the volume of the sustained note + increases or decreases. This can be either lineair or exponential. +Rr = Release rate is the rate at which the volume of the note decreases + as soon as the note off is given. + + lvl | + ^ | /\Dr __ + Sl _| _ / _ \__--- \ + | / ---__ \ Rr + | /Ar Sr \ \ + | / \\ + |/___________________\________ + ->time + +The overal volume can also be set to sweep up or down lineairly or +exponentially from it's current value. This can be done seperately +for left and right. + +Relevant SPU registers: +------------------------------------------------------------- +$1f801xx8 Attack/Decay/Sustain level +bit |0f|0e 0d 0c 0b 0a 09 08|07 06 05 04|03 02 01 00| +desc.|Am| Ar |Dr |Sl | + +Am 0 Attack mode Linear + 1 Exponential + +Ar 0-7f attack rate +Dr 0-f decay rate +Sl 0-f sustain level +------------------------------------------------------------- +$1f801xxa Sustain rate, Release Rate. +bit |0f|0e|0d|0c 0b 0a 09 08 07 06|05|04 03 02 01 00| +desc.|Sm|Sd| 0| Sr |Rm|Rr | + +Sm 0 sustain rate mode linear + 1 exponential +Sd 0 sustain rate mode increase + 1 decrease +Sr 0-7f Sustain Rate +Rm 0 Linear decrease + 1 Exponential decrease +Rr 0-1f Release Rate + +Note: decay mode is always Expontial decrease, and thus cannot +be set. +------------------------------------------------------------- +$1f801xxc Current ADSR volume +bit |0f 0e 0d 0c 0b 0a 09 08 07 06 05 04 03 02 01 00| +desc.|ADSRvol | + +ADSRvol Returns the current envelope volume when + read. +-- James' Note: return range: 0 -> 32767 + +*** doomed doc extract end *** + +By using a small PSX proggie to visualise the envelope as it was played, +the following results for envelope timing were obtained: + +1. Attack rate value (linear mode) + + Attack value range: 0 -> 127 + + Value | 48 | 52 | 56 | 60 | 64 | 68 | 72 | | 80 | + ----------------------------------------------------------------- + Frames | 11 | 21 | 42 | 84 | 169| 338| 676| |2890| + + Note: frames is no. of PAL frames to reach full volume (100% + amplitude) + + Hmm, noticing that the time taken to reach full volume doubles + every time we add 4 to our attack value, we know the equation is + of form: + frames = k * 2 ^ (value / 4) + + (You may ponder about envelope generator hardware at this point, + or maybe not... :) + + By substituting some stuff and running some checks, we get: + + k = 0.00257 (close enuf) + + therefore, + frames = 0.00257 * 2 ^ (value / 4) + If you just happen to be writing an emulator, then you can probably + use an equation like: + + %volume_increase_per_tick = 1 / frames + + + ------------------------------------ + Pete: + ms=((1<<(value>>2))*514)/10000 + ------------------------------------ + +2. Decay rate value (only has log mode) + + Decay value range: 0 -> 15 + + Value | 8 | 9 | 10 | 11 | 12 | 13 | 14 | 15 | + ------------------------------------------------ + frames | | | | | 6 | 12 | 24 | 47 | + + Note: frames here is no. of PAL frames to decay to 50% volume. + + formula: frames = k * 2 ^ (value) + + Substituting, we get: k = 0.00146 + + Further info on logarithmic nature: + frames to decay to sustain level 3 = 3 * frames to decay to + sustain level 9 + + Also no. of frames to 25% volume = roughly 1.85 * no. of frames to + 50% volume. + + Frag it - just use linear approx. + + ------------------------------------ + Pete: + ms=((1< 127 + + Value | 48 | 52 | 56 | 60 | 64 | 68 | 72 | + ------------------------------------------- + frames | 9 | 19 | 37 | 74 | 147| 293| 587| + + Here, frames = no. of PAL frames for volume amplitude to go from 100% + to 0% (or vice-versa). + + Same formula as for attack value, just a different value for k: + + k = 0.00225 + + ie: frames = 0.00225 * 2 ^ (value / 4) + + For emulation purposes: + + %volume_increase_or_decrease_per_tick = 1 / frames + + ------------------------------------ + Pete: + ms=((1<<(value>>2))*450)/10000 + ------------------------------------ + + +4. Release rate (linear mode) + + Release rate range: 0 -> 31 + + Value | 13 | 14 | 15 | 16 | 17 | + --------------------------------------------------------------- + frames | 18 | 36 | 73 | 146| 292| + + Here, frames = no. of PAL frames to decay from 100% vol to 0% vol + after "note-off" is triggered. + + Formula: frames = k * 2 ^ (value) + + And so: k = 0.00223 + + ------------------------------------ + Pete: + ms=((1< release phase + { + if(s_chan[ch].ADSR.ReleaseVal!=0) // -> release not 0: do release (if 0: stop right now) + { + if(!s_chan[ch].ADSR.ReleaseVol) // --> release just started? set up the release stuff + { + s_chan[ch].ADSR.ReleaseStartTime=s_chan[ch].ADSR.lTime; + s_chan[ch].ADSR.ReleaseVol=s_chan[ch].ADSR.lVolume; + s_chan[ch].ADSR.ReleaseTime = // --> calc how long does it take to reach the wanted sus level + (s_chan[ch].ADSR.ReleaseTime* + s_chan[ch].ADSR.ReleaseVol)/1024; + } + // -> NO release exp mode used (yet) + v=s_chan[ch].ADSR.ReleaseVol; // -> get last volume + lT=s_chan[ch].ADSR.lTime- // -> how much time is past? + s_chan[ch].ADSR.ReleaseStartTime; + l1=s_chan[ch].ADSR.ReleaseTime; + + if(lT we still have to release + { + v=v-((v*lT)/l1); // --> calc new volume + } + else // -> release is over: now really stop that sample + {v=0;s_chan[ch].bOn=0;s_chan[ch].ADSR.ReleaseVol=0;s_chan[ch].bNoise=0;} + } + else // -> release IS 0: release at once + { + v=0;s_chan[ch].bOn=0;s_chan[ch].ADSR.ReleaseVol=0;s_chan[ch].bNoise=0; + } + } + else + {//--------------------------------------------------// not in release phase: + v=1024; + lT=s_chan[ch].ADSR.lTime; + l1=s_chan[ch].ADSR.AttackTime; + + if(lT0) + { + if(l3!=0) v2+=((v-v2)*lT)/l3; + else v2=v; + } + else + { + if(l3!=0) v2-=(v2*lT)/l3; + else v2=v; + } + + if(v2>v) v2=v; + if(v2<=0) {v2=0;s_chan[ch].bOn=0;s_chan[ch].ADSR.ReleaseVol=0;s_chan[ch].bNoise=0;} + + v=v2; + } + } + } + + //----------------------------------------------------// + // ok, done for this channel, so increase time + + s_chan[ch].ADSR.lTime+=1; // 1 = 1.020408f ms; + + if(v>1024) v=1024; // adjust volume + if(v<0) v=0; + s_chan[ch].ADSR.lVolume=v; // store act volume + + return v; // return the volume factor +*/ + + +//----------------------------------------------------------------------------- +//----------------------------------------------------------------------------- +//----------------------------------------------------------------------------- + + +/* +----------------------------------------------------------------------------- +Neill Corlett +Playstation SPU envelope timing notes +----------------------------------------------------------------------------- + +This is preliminary. This may be wrong. But the model described herein fits +all of my experimental data, and it's just simple enough to sound right. + +ADSR envelope level ranges from 0x00000000 to 0x7FFFFFFF internally. +The value returned by channel reg 0xC is (envelope_level>>16). + +Each sample, an increment or decrement value will be added to or +subtracted from this envelope level. + +Create the rate log table. The values double every 4 entries. + entry #0 = 4 + + 4, 5, 6, 7, + 8,10,12,14, + 16,20,24,28, ... + + entry #40 = 4096... + entry #44 = 8192... + entry #48 = 16384... + entry #52 = 32768... + entry #56 = 65536... + +increments and decrements are in terms of ratelogtable[n] +n may exceed the table bounds (plan on n being between -32 and 127). +table values are all clipped between 0x00000000 and 0x3FFFFFFF + +when you "voice on", the envelope is always fully reset. +(yes, it may click. the real thing does this too.) + +envelope level begins at zero. + +each state happens for at least 1 cycle +(transitions are not instantaneous) +this may result in some oddness: if the decay rate is uberfast, it will cut +the envelope from full down to half in one sample, potentially skipping over +the sustain level + +ATTACK +------ +- if the envelope level has overflowed past the max, clip to 0x7FFFFFFF and + proceed to DECAY. + +Linear attack mode: +- line extends upward to 0x7FFFFFFF +- increment per sample is ratelogtable[(Ar^0x7F)-0x10] + +Logarithmic attack mode: +if envelope_level < 0x60000000: + - line extends upward to 0x60000000 + - increment per sample is ratelogtable[(Ar^0x7F)-0x10] +else: + - line extends upward to 0x7FFFFFFF + - increment per sample is ratelogtable[(Ar^0x7F)-0x18] + +DECAY +----- +- if ((envelope_level>>27)&0xF) <= Sl, proceed to SUSTAIN. + Do not clip to the sustain level. +- current line ends at (envelope_level & 0x07FFFFFF) +- decrement per sample depends on (envelope_level>>28)&0x7 + 0: ratelogtable[(4*(Dr^0x1F))-0x18+0] + 1: ratelogtable[(4*(Dr^0x1F))-0x18+4] + 2: ratelogtable[(4*(Dr^0x1F))-0x18+6] + 3: ratelogtable[(4*(Dr^0x1F))-0x18+8] + 4: ratelogtable[(4*(Dr^0x1F))-0x18+9] + 5: ratelogtable[(4*(Dr^0x1F))-0x18+10] + 6: ratelogtable[(4*(Dr^0x1F))-0x18+11] + 7: ratelogtable[(4*(Dr^0x1F))-0x18+12] + (note that this is the same as the release rate formula, except that + decay rates 10-1F aren't possible... those would be slower in theory) + +SUSTAIN +------- +- no terminating condition except for voice off +- Sd=0 (increase) behavior is identical to ATTACK for both log and linear. +- Sd=1 (decrease) behavior: +Linear sustain decrease: +- line extends to 0x00000000 +- decrement per sample is ratelogtable[(Sr^0x7F)-0x0F] +Logarithmic sustain decrease: +- current line ends at (envelope_level & 0x07FFFFFF) +- decrement per sample depends on (envelope_level>>28)&0x7 + 0: ratelogtable[(Sr^0x7F)-0x1B+0] + 1: ratelogtable[(Sr^0x7F)-0x1B+4] + 2: ratelogtable[(Sr^0x7F)-0x1B+6] + 3: ratelogtable[(Sr^0x7F)-0x1B+8] + 4: ratelogtable[(Sr^0x7F)-0x1B+9] + 5: ratelogtable[(Sr^0x7F)-0x1B+10] + 6: ratelogtable[(Sr^0x7F)-0x1B+11] + 7: ratelogtable[(Sr^0x7F)-0x1B+12] + +RELEASE +------- +- if the envelope level has overflowed to negative, clip to 0 and QUIT. + +Linear release mode: +- line extends to 0x00000000 +- decrement per sample is ratelogtable[(4*(Rr^0x1F))-0x0C] + +Logarithmic release mode: +- line extends to (envelope_level & 0x0FFFFFFF) +- decrement per sample depends on (envelope_level>>28)&0x7 + 0: ratelogtable[(4*(Rr^0x1F))-0x18+0] + 1: ratelogtable[(4*(Rr^0x1F))-0x18+4] + 2: ratelogtable[(4*(Rr^0x1F))-0x18+6] + 3: ratelogtable[(4*(Rr^0x1F))-0x18+8] + 4: ratelogtable[(4*(Rr^0x1F))-0x18+9] + 5: ratelogtable[(4*(Rr^0x1F))-0x18+10] + 6: ratelogtable[(4*(Rr^0x1F))-0x18+11] + 7: ratelogtable[(4*(Rr^0x1F))-0x18+12] + +----------------------------------------------------------------------------- +*/ + -- cgit v1.2.3