/*************************************************************************** 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. * * * ***************************************************************************/ //*************************************************************************// // History of changes: // // 2003/05/14 - xodnizel // - removed stopping of reverb on sample end // // 2003/01/06 - Pete // - added Neill's ADSR timings // // 2002/05/15 - Pete // - generic cleanup for the Peops release // //*************************************************************************// #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; } } //////////////////////////////////////////////////////////////////////// static INLINE void StartADSR(spu2_state_t *spu, int ch) // MIX ADSR { spu->s_chan[ch].ADSRX.lVolume=1; // and init some adsr vars spu->s_chan[ch].ADSRX.State=0; spu->s_chan[ch].ADSRX.EnvelopeVol=0; } //////////////////////////////////////////////////////////////////////// static INLINE int MixADSR(spu2_state_t *spu, int ch) // MIX ADSR { if(spu->s_chan[ch].bStop) // should be stopped: { // do release if(spu->s_chan[ch].ADSRX.ReleaseModeExp) { switch((spu->s_chan[ch].ADSRX.EnvelopeVol>>28)&0x7) { case 0: spu->s_chan[ch].ADSRX.EnvelopeVol-=RateTable[(4*(spu->s_chan[ch].ADSRX.ReleaseRate^0x1F))-0x18 +0 + 32]; break; case 1: spu->s_chan[ch].ADSRX.EnvelopeVol-=RateTable[(4*(spu->s_chan[ch].ADSRX.ReleaseRate^0x1F))-0x18 +4 + 32]; break; case 2: spu->s_chan[ch].ADSRX.EnvelopeVol-=RateTable[(4*(spu->s_chan[ch].ADSRX.ReleaseRate^0x1F))-0x18 +6 + 32]; break; case 3: spu->s_chan[ch].ADSRX.EnvelopeVol-=RateTable[(4*(spu->s_chan[ch].ADSRX.ReleaseRate^0x1F))-0x18 +8 + 32]; break; case 4: spu->s_chan[ch].ADSRX.EnvelopeVol-=RateTable[(4*(spu->s_chan[ch].ADSRX.ReleaseRate^0x1F))-0x18 +9 + 32]; break; case 5: spu->s_chan[ch].ADSRX.EnvelopeVol-=RateTable[(4*(spu->s_chan[ch].ADSRX.ReleaseRate^0x1F))-0x18 +10+ 32]; break; case 6: spu->s_chan[ch].ADSRX.EnvelopeVol-=RateTable[(4*(spu->s_chan[ch].ADSRX.ReleaseRate^0x1F))-0x18 +11+ 32]; break; case 7: spu->s_chan[ch].ADSRX.EnvelopeVol-=RateTable[(4*(spu->s_chan[ch].ADSRX.ReleaseRate^0x1F))-0x18 +12+ 32]; break; } } else { spu->s_chan[ch].ADSRX.EnvelopeVol-=RateTable[(4*(spu->s_chan[ch].ADSRX.ReleaseRate^0x1F))-0x0C + 32]; } if(spu->s_chan[ch].ADSRX.EnvelopeVol<0) { spu->s_chan[ch].ADSRX.EnvelopeVol=0; spu->s_chan[ch].bOn=0; //spu->s_chan[ch].bReverb=0; //spu->s_chan[ch].bNoise=0; } spu->s_chan[ch].ADSRX.lVolume=spu->s_chan[ch].ADSRX.EnvelopeVol>>21; return spu->s_chan[ch].ADSRX.lVolume; } else // not stopped yet? { if(spu->s_chan[ch].ADSRX.State==0) // -> attack { if(spu->s_chan[ch].ADSRX.AttackModeExp) { if(spu->s_chan[ch].ADSRX.EnvelopeVol<0x60000000) spu->s_chan[ch].ADSRX.EnvelopeVol+=RateTable[(spu->s_chan[ch].ADSRX.AttackRate^0x7F)-0x10 + 32]; else spu->s_chan[ch].ADSRX.EnvelopeVol+=RateTable[(spu->s_chan[ch].ADSRX.AttackRate^0x7F)-0x18 + 32]; } else { spu->s_chan[ch].ADSRX.EnvelopeVol+=RateTable[(spu->s_chan[ch].ADSRX.AttackRate^0x7F)-0x10 + 32]; } if(spu->s_chan[ch].ADSRX.EnvelopeVol<0) { spu->s_chan[ch].ADSRX.EnvelopeVol=0x7FFFFFFF; spu->s_chan[ch].ADSRX.State=1; } spu->s_chan[ch].ADSRX.lVolume=spu->s_chan[ch].ADSRX.EnvelopeVol>>21; return spu->s_chan[ch].ADSRX.lVolume; } //--------------------------------------------------// if(spu->s_chan[ch].ADSRX.State==1) // -> decay { switch((spu->s_chan[ch].ADSRX.EnvelopeVol>>28)&0x7) { case 0: spu->s_chan[ch].ADSRX.EnvelopeVol-=RateTable[(4*(spu->s_chan[ch].ADSRX.DecayRate^0x1F))-0x18+0 + 32]; break; case 1: spu->s_chan[ch].ADSRX.EnvelopeVol-=RateTable[(4*(spu->s_chan[ch].ADSRX.DecayRate^0x1F))-0x18+4 + 32]; break; case 2: spu->s_chan[ch].ADSRX.EnvelopeVol-=RateTable[(4*(spu->s_chan[ch].ADSRX.DecayRate^0x1F))-0x18+6 + 32]; break; case 3: spu->s_chan[ch].ADSRX.EnvelopeVol-=RateTable[(4*(spu->s_chan[ch].ADSRX.DecayRate^0x1F))-0x18+8 + 32]; break; case 4: spu->s_chan[ch].ADSRX.EnvelopeVol-=RateTable[(4*(spu->s_chan[ch].ADSRX.DecayRate^0x1F))-0x18+9 + 32]; break; case 5: spu->s_chan[ch].ADSRX.EnvelopeVol-=RateTable[(4*(spu->s_chan[ch].ADSRX.DecayRate^0x1F))-0x18+10+ 32]; break; case 6: spu->s_chan[ch].ADSRX.EnvelopeVol-=RateTable[(4*(spu->s_chan[ch].ADSRX.DecayRate^0x1F))-0x18+11+ 32]; break; case 7: spu->s_chan[ch].ADSRX.EnvelopeVol-=RateTable[(4*(spu->s_chan[ch].ADSRX.DecayRate^0x1F))-0x18+12+ 32]; break; } if(spu->s_chan[ch].ADSRX.EnvelopeVol<0) spu->s_chan[ch].ADSRX.EnvelopeVol=0; if(((spu->s_chan[ch].ADSRX.EnvelopeVol>>27)&0xF) <= spu->s_chan[ch].ADSRX.SustainLevel) { spu->s_chan[ch].ADSRX.State=2; } spu->s_chan[ch].ADSRX.lVolume=spu->s_chan[ch].ADSRX.EnvelopeVol>>21; return spu->s_chan[ch].ADSRX.lVolume; } //--------------------------------------------------// if(spu->s_chan[ch].ADSRX.State==2) // -> sustain { if(spu->s_chan[ch].ADSRX.SustainIncrease) { if(spu->s_chan[ch].ADSRX.SustainModeExp) { if(spu->s_chan[ch].ADSRX.EnvelopeVol<0x60000000) spu->s_chan[ch].ADSRX.EnvelopeVol+=RateTable[(spu->s_chan[ch].ADSRX.SustainRate^0x7F)-0x10 + 32]; else spu->s_chan[ch].ADSRX.EnvelopeVol+=RateTable[(spu->s_chan[ch].ADSRX.SustainRate^0x7F)-0x18 + 32]; } else { spu->s_chan[ch].ADSRX.EnvelopeVol+=RateTable[(spu->s_chan[ch].ADSRX.SustainRate^0x7F)-0x10 + 32]; } if(spu->s_chan[ch].ADSRX.EnvelopeVol<0) { spu->s_chan[ch].ADSRX.EnvelopeVol=0x7FFFFFFF; } } else { if(spu->s_chan[ch].ADSRX.SustainModeExp) { switch((spu->s_chan[ch].ADSRX.EnvelopeVol>>28)&0x7) { case 0: spu->s_chan[ch].ADSRX.EnvelopeVol-=RateTable[((spu->s_chan[ch].ADSRX.SustainRate^0x7F))-0x1B +0 + 32];break; case 1: spu->s_chan[ch].ADSRX.EnvelopeVol-=RateTable[((spu->s_chan[ch].ADSRX.SustainRate^0x7F))-0x1B +4 + 32];break; case 2: spu->s_chan[ch].ADSRX.EnvelopeVol-=RateTable[((spu->s_chan[ch].ADSRX.SustainRate^0x7F))-0x1B +6 + 32];break; case 3: spu->s_chan[ch].ADSRX.EnvelopeVol-=RateTable[((spu->s_chan[ch].ADSRX.SustainRate^0x7F))-0x1B +8 + 32];break; case 4: spu->s_chan[ch].ADSRX.EnvelopeVol-=RateTable[((spu->s_chan[ch].ADSRX.SustainRate^0x7F))-0x1B +9 + 32];break; case 5: spu->s_chan[ch].ADSRX.EnvelopeVol-=RateTable[((spu->s_chan[ch].ADSRX.SustainRate^0x7F))-0x1B +10+ 32];break; case 6: spu->s_chan[ch].ADSRX.EnvelopeVol-=RateTable[((spu->s_chan[ch].ADSRX.SustainRate^0x7F))-0x1B +11+ 32];break; case 7: spu->s_chan[ch].ADSRX.EnvelopeVol-=RateTable[((spu->s_chan[ch].ADSRX.SustainRate^0x7F))-0x1B +12+ 32];break; } } else { spu->s_chan[ch].ADSRX.EnvelopeVol-=RateTable[((spu->s_chan[ch].ADSRX.SustainRate^0x7F))-0x0F + 32]; } if(spu->s_chan[ch].ADSRX.EnvelopeVol<0) { spu->s_chan[ch].ADSRX.EnvelopeVol=0; } } spu->s_chan[ch].ADSRX.lVolume=spu->s_chan[ch].ADSRX.EnvelopeVol>>21; return spu->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<s_chan[ch].bStop) // psx wants to stop? -> release phase { if(spu->s_chan[ch].ADSR.ReleaseVal!=0) // -> release not 0: do release (if 0: stop right now) { if(!spu->s_chan[ch].ADSR.ReleaseVol) // --> release just started? set up the release stuff { spu->s_chan[ch].ADSR.ReleaseStartTime=spu->s_chan[ch].ADSR.lTime; spu->s_chan[ch].ADSR.ReleaseVol=spu->s_chan[ch].ADSR.lVolume; spu->s_chan[ch].ADSR.ReleaseTime = // --> calc how long does it take to reach the wanted sus level (spu->s_chan[ch].ADSR.ReleaseTime* spu->s_chan[ch].ADSR.ReleaseVol)/1024; } // -> NO release exp mode used (yet) v=spu->s_chan[ch].ADSR.ReleaseVol; // -> get last volume lT=spu->s_chan[ch].ADSR.lTime- // -> how much time is past? spu->s_chan[ch].ADSR.ReleaseStartTime; l1=spu->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;spu->s_chan[ch].bOn=0;spu->s_chan[ch].ADSR.ReleaseVol=0;spu->s_chan[ch].bNoise=0;} } else // -> release IS 0: release at once { v=0;spu->s_chan[ch].bOn=0;spu->s_chan[ch].ADSR.ReleaseVol=0;spu->s_chan[ch].bNoise=0; } } else {//--------------------------------------------------// not in release phase: v=1024; lT=spu->s_chan[ch].ADSR.lTime; l1=spu->s_chan[ch].ADSR.AttackTime; if(lTs_chan[ch].ADSR.AttackModeExp) // { // v=(v*lT)/l1; // } // else { v=(v*lT)/l1; } if(v==0) v=1; } else // decay { // should be exp, but who cares? ;) l2=spu->s_chan[ch].ADSR.DecayTime; v2=spu->s_chan[ch].ADSR.SustainLevel; lT-=l1; if(lTs_chan[ch].ADSR.SustainTime; lT-=l2; if(spu->s_chan[ch].ADSR.SustainModeDec>0) { 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;spu->s_chan[ch].bOn=0;spu->s_chan[ch].ADSR.ReleaseVol=0;spu->s_chan[ch].bNoise=0;} v=v2; } } } //----------------------------------------------------// // ok, done for this channel, so increase time spu->s_chan[ch].ADSR.lTime+=1; // 1 = 1.020408f ms; if(v>1024) v=1024; // adjust volume if(v<0) v=0; spu->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] ----------------------------------------------------------------------------- */