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resample.cpp
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/*
$Id$
TiMidity++ -- MIDI to WAVE converter and player
Copyright (C) 1999 Masanao Izumo <mo@goice.co.jp>
Copyright (C) 1995 Tuukka Toivonen <tt@cgs.fi>
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.
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 General Public License for more details.
You should have received a copy of the GNU General Public License
along with this program; if not, write to the Free Software
Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
*/
#include <math.h>
#include <stdio.h>
#include <stdlib.h>
#include "config.h"
#include "common.h"
#include "instrum.h"
#include "playmidi.h"
#include "output.h"
#include "controls.h"
#include "tables.h"
#include "resample.h"
#define LINEAR_INTERPOLATION
#define CSPLINE_INTERPOLATION
#define ENVELOPE_PITCH_MODULATION
#ifdef LOOKUP_HACK
#define MAX_DATAVAL 127
#define MIN_DATAVAL -128
#else
#define MAX_DATAVAL 32767
#define MIN_DATAVAL -32768
#endif
#define OVERSHOOT_STEP 50
sample_t resample_buffer[AUDIO_BUFFER_SIZE+100];
uint32 resample_buffer_offset = 0;
static sample_t *vib_resample_voice(int, uint32 *, int);
static sample_t *normal_resample_voice(int, uint32 *, int);
/* Returns 1 if envelope runs out */
int recompute_modulation(int v)
{
int stage;
stage = voice[v].modulation_stage;
if (stage>5)
{
/* Envelope ran out. */
voice[v].modulation_increment = 0;
return 1;
}
if ((voice[v].sample->modes & MODES_ENVELOPE) && (voice[v].sample->modes & MODES_SUSTAIN))
{
if (voice[v].status & (VOICE_ON | VOICE_SUSTAINED))
{
if (stage>2)
{
/* Freeze modulation until note turns off. Trumpets want this. */
voice[v].modulation_increment=0;
return 0;
}
}
}
voice[v].modulation_stage=stage+1;
#ifdef tplus
if (voice[v].modulation_volume==(int)voice[v].sample->modulation_offset[stage] ||
(stage > 2 && voice[v].modulation_volume < (int)voice[v].sample->modulation_offset[stage]))
#else
if (voice[v].modulation_volume==voice[v].sample->modulation_offset[stage])
#endif
return recompute_modulation(v);
voice[v].modulation_target=voice[v].sample->modulation_offset[stage];
voice[v].modulation_increment = voice[v].sample->modulation_rate[stage];
if ((int)voice[v].modulation_target<voice[v].modulation_volume)
voice[v].modulation_increment = -voice[v].modulation_increment;
return 0;
}
int update_modulation(int v)
{
if(voice[v].modulation_delay > 0)
{
/* voice[v].modulation_delay -= control_ratio; I think units are already
in terms of control_ratio */
voice[v].modulation_delay -= 1;
if(voice[v].modulation_delay > 0)
return 0;
}
voice[v].modulation_volume += voice[v].modulation_increment;
if (voice[v].modulation_volume < 0) voice[v].modulation_volume = 0;
/* Why is there no ^^ operator?? */
if (((voice[v].modulation_increment < 0) &&
(voice[v].modulation_volume <= (int)voice[v].modulation_target)) ||
((voice[v].modulation_increment > 0) &&
(voice[v].modulation_volume >= (int)voice[v].modulation_target)))
{
voice[v].modulation_volume = voice[v].modulation_target;
if (recompute_modulation(v))
return 1;
}
return 0;
}
/* Returns 1 if the note died */
int update_modulation_signal(int v)
{
if (voice[v].modulation_increment && update_modulation(v))
return 1;
return 0;
}
/* modulation_volume has been set by above routine */
int32 calc_mod_freq(int v, int32 incr)
{
FLOAT_T mod_amount;
int32 freq;
/* already done in update_vibrato ? */
if (voice[v].vibrato_control_ratio) return incr;
if ((mod_amount=voice[v].sample->modEnvToPitch)<0.02) return incr;
if (incr < 0) return incr;
freq = voice[v].frequency;
freq = (int32)( (double)freq*(1.0 + (mod_amount - 1.0) * (voice[v].modulation_volume>>22) / 255.0) );
return (int32) FRSCALE(((double)(voice[v].sample->sample_rate) *
(double)(freq)) /
((double)(voice[v].sample->root_freq) *
(double)(play_mode->rate)),
FRACTION_BITS);
}
/*************** resampling with fixed increment *****************/
static sample_t *rs_plain(int v, uint32 *countptr)
{
/* Play sample until end, then free the voice. */
Voice
*vp=&voice[v];
int32 ofsd, v0, v1, v2, v3, temp, overshoot;
int offset;
uint32 cc_count=vp->modulation_counter;
sample_t
*dest=resample_buffer+resample_buffer_offset,
*src=vp->sample->data;
int32
incr=vp->sample_increment;
uint32
ofs=vp->sample_offset;
#if defined(LAGRANGE_INTERPOLATION) || defined(CSPLINE_INTERPOLATION)
uint32
ls=0,
le=vp->sample->data_length;
#endif /* LAGRANGE_INTERPOLATION */
uint32
se=vp->sample->data_length;
uint32
count=*countptr;
if (!incr) return resample_buffer+resample_buffer_offset; /* --gl */
overshoot = src[(se>>FRACTION_BITS)-1] / OVERSHOOT_STEP;
if (overshoot < 0) overshoot = -overshoot;
while (count--)
{
offset = ofs >> FRACTION_BITS;
if (ofs >= se) {
int32 delta = (int32)((ofs - se)>>FRACTION_BITS) ;
v1 = (int32)src[(int)(se>>FRACTION_BITS)-1];
v1 -= (delta+1) * v1 / overshoot;
}else v1 = (int32)src[offset];
if (ofs + (1L<<FRACTION_BITS) >= se) {
v2 = v1;
}else v2 = (int32)src[offset+1];
if(dont_cspline ||
((ofs-(1L<<FRACTION_BITS))<ls)||((ofs+(2L<<FRACTION_BITS))>le)){
*dest++ = (sample_t)(v1 + ((int32)((v2-v1) * (int32)(ofs & FRACTION_MASK)) >> FRACTION_BITS));
}else{
ofsd=ofs;
v0 = (int32)src[offset-1];
v3 = (int32)src[offset+2];
ofs &= FRACTION_MASK;
temp=v2;
v2 = (6*v2 +
(((( ( (5*v3 - 11*v2 + 7*v1 - v0)*
(int32)ofs) >>FRACTION_BITS)*(int32)ofs)>>(FRACTION_BITS+2))-1))*(int32)ofs;
ofs = (1L << FRACTION_BITS) - ofs;
v1 = (6*v1 +
((((((5*v0 - 11*v1 + 7*temp - v3)*
(int32)ofs)>>FRACTION_BITS)*(int32)ofs)>>(FRACTION_BITS+2))-1))*(int32)ofs;
v1 = (v1 + v2)/(6L<<FRACTION_BITS);
*dest++ = (sample_t)((v1 > MAX_DATAVAL)? MAX_DATAVAL: ((v1 < MIN_DATAVAL)? MIN_DATAVAL: v1));
ofs=ofsd;
}
if (!cc_count--) {
cc_count = control_ratio - 1;
if (!update_modulation_signal(v))
incr = calc_mod_freq(v, incr);
}
ofs += incr;
if (ofs >= se + (overshoot << FRACTION_BITS))
{
if (!(vp->status&VOICE_FREE))
{
vp->status=VOICE_FREE;
ctl->note(v);
}
*countptr-=count+1;
break;
}
}
vp->sample_offset=ofs; /* Update offset */
vp->modulation_counter=cc_count;
return resample_buffer+resample_buffer_offset;
}
static sample_t *rs_loop(int v, Voice *vp, uint32 *countptr)
{
/* Play sample until end-of-loop, skip back and continue. */
int32 ofsd, v0, v1, v2, v3, temp, overshoot;
int offset;
uint32 cc_count=vp->modulation_counter;
int32
incr=vp->sample_increment;
uint32
ofs=vp->sample_offset;
uint32
le=vp->loop_end,
#if defined(LAGRANGE_INTERPOLATION) || defined(CSPLINE_INTERPOLATION)
ls=vp->loop_start,
#endif /* LAGRANGE_INTERPOLATION */
ll=le - vp->loop_start;
sample_t
*dest=resample_buffer+resample_buffer_offset,
*src=vp->sample->data;
uint32
se=vp->sample->data_length,
count = *countptr;
int
flag_exit_loop;
flag_exit_loop =
(vp->status & (VOICE_FREE | VOICE_DIE)) ||
((vp->status & VOICE_OFF) && (vp->sample->modes & MODES_FAST_RELEASE) ) ||
((vp->status & VOICE_OFF) && dont_keep_looping ) ;
overshoot = src[(se>>FRACTION_BITS)-1] / OVERSHOOT_STEP;
if (overshoot < 0) overshoot = -overshoot;
while (count--)
{
offset = ofs >> FRACTION_BITS;
if (ofs >= se) {
int32 delta = (int32)((ofs - se)>>FRACTION_BITS) ;
v1 = (int32)src[(int)(se>>FRACTION_BITS)-1];
v1 -= (delta+1) * v1 / overshoot;
}else v1 = (int32)src[offset];
if (ofs + (1L<<FRACTION_BITS) >= se) {
v2 = v1;
}else v2 = (int32)src[offset+1];
if(dont_cspline ||
((ofs-(1L<<FRACTION_BITS))<ls)||((ofs+(2L<<FRACTION_BITS))>le)){
*dest++ = (sample_t)(v1 + ((int32)((v2-v1) * (int32)(ofs & FRACTION_MASK)) >> FRACTION_BITS));
}else{
ofsd=ofs;
v0 = (int32)src[offset-1];
v3 = (int32)src[offset+2];
ofs &= FRACTION_MASK;
temp=v2;
v2 = (6*v2 +
(((( ( (5*v3 - 11*v2 + 7*v1 - v0)*
(int32)ofs) >>FRACTION_BITS)*(int32)ofs)>>(FRACTION_BITS+2))-1))*(int32)ofs;
ofs = (1L << FRACTION_BITS) - ofs;
v1 = (6*v1 +
((((((5*v0 - 11*v1 + 7*temp - v3)*
(int32)ofs)>>FRACTION_BITS)*(int32)ofs)>>(FRACTION_BITS+2))-1))*(int32)ofs;
v1 = (v1 + v2)/(6L<<FRACTION_BITS);
*dest++ = (sample_t)((v1 > MAX_DATAVAL)? MAX_DATAVAL: ((v1 < MIN_DATAVAL)? MIN_DATAVAL: v1));
ofs=ofsd;
}
if (!cc_count--) {
cc_count = control_ratio - 1;
if (!update_modulation_signal(v))
incr = calc_mod_freq(v, incr);
}
ofs += incr;
if (ofs>=le)
{
if (flag_exit_loop)
{
vp->echo_delay -= ll >> FRACTION_BITS;
if (vp->echo_delay >= 0) ofs -= ll;
}
else ofs -= ll; /* Hopefully the loop is longer than an increment. */
}
if (ofs >= se + (overshoot << FRACTION_BITS))
{
if (!(vp->status&VOICE_FREE))
{
vp->status=VOICE_FREE;
ctl->note(v);
}
*countptr-=count+1;
break;
}
}
vp->sample_offset=ofs; /* Update offset */
vp->modulation_counter=cc_count;
return resample_buffer+resample_buffer_offset;
}
static sample_t *rs_bidir(int v, Voice *vp, uint32 count)
{
int32 ofsd, v0, v1, v2, v3, temp, overshoot;
int offset;
int32
incr=vp->sample_increment;
uint32
le=vp->loop_end,
ls=vp->loop_start;
uint32
ofs=vp->sample_offset,
se=vp->sample->data_length;
sample_t
*dest=resample_buffer+resample_buffer_offset,
*src=vp->sample->data;
#ifdef USE_BIDIR_OVERSHOOT
int32
le2 = le<<1,
ls2 = ls<<1;
#endif
uint32
i, j;
/* Play normally until inside the loop region */
overshoot = src[(se>>FRACTION_BITS)-1] / OVERSHOOT_STEP;
if (overshoot < 0) overshoot = -overshoot;
if (ofs <= ls)
{
/* NOTE: Assumes that incr > 0, which is NOT always the case
when doing bidirectional looping. I have yet to see a case
where both ofs <= ls AND incr < 0, however. */
if (incr < 0) i = ls - ofs;
else
i = (ls - ofs) / incr + 1;
if (i > count)
{
i = count;
count = 0;
}
else count -= i;
for(j = 0; j < i; j++)
{
offset = ofs >> FRACTION_BITS;
if (ofs >= se) {
int32 delta = (int32)((ofs - se)>>FRACTION_BITS) ;
v1 = (int32)src[(int)(se>>FRACTION_BITS)-1];
v1 -= (delta+1) * v1 / overshoot;
}else v1 = (int32)src[offset];
if (ofs + (1L<<FRACTION_BITS) >= se) {
v2 = v1;
}else v2 = (int32)src[offset+1];
if(dont_cspline ||
((ofs-(1L<<FRACTION_BITS))<ls)||((ofs+(2L<<FRACTION_BITS))>le)){
*dest++ = (sample_t)(v1 + ((int32)((v2-v1) * (int32)(ofs & FRACTION_MASK)) >> FRACTION_BITS));
}else{
ofsd=ofs;
v0 = (int32)src[offset-1];
v3 = (int32)src[offset+2];
ofs &= FRACTION_MASK;
temp=v2;
v2 = (6*v2 +
(((( ( (5*v3 - 11*v2 + 7*v1 - v0)*
(int32)ofs) >>FRACTION_BITS)*(int32)ofs)>>(FRACTION_BITS+2))-1))*(int32)ofs;
ofs = (1L << FRACTION_BITS) - ofs;
v1 = (6*v1 +
((((((5*v0 - 11*v1 + 7*temp - v3)*
(int32)ofs)>>FRACTION_BITS)*(int32)ofs)>>(FRACTION_BITS+2))-1))*(int32)ofs;
v1 = (v1 + v2)/(6L<<FRACTION_BITS);
*dest++ = (sample_t)((v1 > MAX_DATAVAL)? MAX_DATAVAL: ((v1 < MIN_DATAVAL)? MIN_DATAVAL: v1));
ofs=ofsd;
}
ofs += incr;
}
}
/* Then do the bidirectional looping */
while(count)
{
/* Precalc how many times we should go through the loop */
#if 1
i = ((incr > 0 ? le : ls) - ofs) / incr + 1;
#else
/* fix from M. Izumo */
i = ((incr > 0 ? le : ls) - ofs + incr - 1) / incr;
#endif
if (i > count)
{
i = count;
count = 0;
}
else count -= i;
for(j = 0; j < i && ofs < se; j++)
{
offset = ofs >> FRACTION_BITS;
if (ofs >= se) {
int32 delta = (int32)((ofs - se)>>FRACTION_BITS) ;
v1 = (int32)src[(int)(se>>FRACTION_BITS)-1];
v1 -= (delta+1) * v1 / overshoot;
}else v1 = (int32)src[offset];
if (ofs + (1L<<FRACTION_BITS) >= se) {
v2 = v1;
}else v2 = (int32)src[offset+1];
if(dont_cspline ||
((ofs-(1L<<FRACTION_BITS))<ls)||((ofs+(2L<<FRACTION_BITS))>le)){
*dest++ = (sample_t)(v1 + ((int32)((v2-v1) * (int32)(ofs & FRACTION_MASK)) >> FRACTION_BITS));
}else{
ofsd=ofs;
v0 = (int32)src[offset-1];
v3 = (int32)src[offset+2];
ofs &= FRACTION_MASK;
temp=v2;
v2 = (6*v2 +
(((( ( (5*v3 - 11*v2 + 7*v1 - v0)*
(int32)ofs) >>FRACTION_BITS)*(int32)ofs)>>(FRACTION_BITS+2))-1))*(int32)ofs;
ofs = (1L << FRACTION_BITS) - ofs;
v1 = (6*v1 +
((((((5*v0 - 11*v1 + 7*temp - v3)*
(int32)ofs)>>FRACTION_BITS)*(int32)ofs)>>(FRACTION_BITS+2))-1))*(int32)ofs;
v1 = (v1 + v2)/(6L<<FRACTION_BITS);
*dest++ = (sample_t)((v1 > MAX_DATAVAL)? MAX_DATAVAL: ((v1 < MIN_DATAVAL)? MIN_DATAVAL: v1));
ofs=ofsd;
}
ofs += incr;
}
#ifdef USE_BIDIR_OVERSHOOT
if (ofs>=le)
{
/* fold the overshoot back in */
ofs = le2 - ofs;
incr *= -1;
}
else if (ofs <= ls)
{
ofs = ls2 - ofs;
incr *= -1;
}
#else
incr *= -1;
#endif
}
vp->sample_increment=incr;
vp->sample_offset=ofs; /* Update offset */
return resample_buffer+resample_buffer_offset;
}
/*********************** vibrato versions ***************************/
/* We only need to compute one half of the vibrato sine cycle */
static uint32 vib_phase_to_inc_ptr(uint32 phase)
{
if (phase < VIBRATO_SAMPLE_INCREMENTS/2)
return VIBRATO_SAMPLE_INCREMENTS/2-1-phase;
else if (phase >= 3*VIBRATO_SAMPLE_INCREMENTS/2)
return 5*VIBRATO_SAMPLE_INCREMENTS/2-1-phase;
else
return phase-VIBRATO_SAMPLE_INCREMENTS/2;
}
static int32 update_vibrato(Voice *vp, int sign)
{
uint32 depth, freq=vp->frequency;
#ifdef ENVELOPE_PITCH_MODULATION
FLOAT_T mod_amount=vp->sample->modEnvToPitch;
#endif
uint32 phase;
int pb;
double a;
if(vp->vibrato_delay > 0)
{
vp->vibrato_delay -= vp->vibrato_control_ratio;
if(vp->vibrato_delay > 0)
return vp->sample_increment;
}
if (vp->vibrato_phase++ >= 2*VIBRATO_SAMPLE_INCREMENTS-1)
vp->vibrato_phase=0;
phase=vib_phase_to_inc_ptr(vp->vibrato_phase);
if (vp->vibrato_sample_increment[phase])
{
if (sign)
return -vp->vibrato_sample_increment[phase];
else
return vp->vibrato_sample_increment[phase];
}
/* Need to compute this sample increment. */
depth = vp->vibrato_depth;
if(depth < vp->modulation_wheel)
depth = vp->modulation_wheel;
depth <<= 7;
if (vp->vibrato_sweep && !vp->modulation_wheel)
{
/* Need to update sweep */
vp->vibrato_sweep_position += vp->vibrato_sweep;
if (vp->vibrato_sweep_position >= (1<<SWEEP_SHIFT))
vp->vibrato_sweep=0;
else
{
/* Adjust depth */
depth *= vp->vibrato_sweep_position;
depth >>= SWEEP_SHIFT;
}
}
#ifdef ENVELOPE_PITCH_MODULATION
#ifndef FILTER_INTERPOLATION
if (update_modulation_signal(0)) mod_amount = 0;
else
#endif
if (mod_amount>0.02)
freq = (int32)( (double)freq*(1.0 + (mod_amount - 1.0) * (vp->modulation_volume>>22) / 255.0) );
#endif
pb=(int)((sine(vp->vibrato_phase *
(SINE_CYCLE_LENGTH/(2*VIBRATO_SAMPLE_INCREMENTS)))
* (double)(depth) * VIBRATO_AMPLITUDE_TUNING));
a = FRSCALE(((double)(vp->sample->sample_rate) *
(double)(freq)) /
((double)(vp->sample->root_freq) *
(double)(play_mode->rate)),
FRACTION_BITS);
if(pb<0)
{
pb = -pb;
a /= bend_fine[(pb>>5) & 0xFF] * bend_coarse[pb>>13];
}
else
a *= bend_fine[(pb>>5) & 0xFF] * bend_coarse[pb>>13];
a += 0.5;
/* If the sweep's over, we can store the newly computed sample_increment */
if (!vp->vibrato_sweep || vp->modulation_wheel)
vp->vibrato_sample_increment[phase]=(int32) a;
if (sign)
a = -a; /* need to preserve the loop direction */
return (int32) a;
}
static sample_t *rs_vib_plain(int v, uint32 *countptr)
{
/* Play sample until end, then free the voice. */
Voice *vp=&voice[v];
int32 ofsd, v0, v1, v2, v3, temp, overshoot;
int offset;
sample_t
*dest=resample_buffer+resample_buffer_offset,
*src=vp->sample->data;
int32
incr=vp->sample_increment;
/*WHY int32??*/
#if defined(LAGRANGE_INTERPOLATION) || defined(CSPLINE_INTERPOLATION)
uint32
ls=0,
le=vp->sample->data_length;
#endif /* LAGRANGE_INTERPOLATION */
uint32
ofs=vp->sample_offset,
se=vp->sample->data_length,
count=*countptr;
uint32
cc=vp->vibrato_control_counter;
/* This has never been tested */
if (incr<0) incr = -incr; /* In case we're coming out of a bidir loop */
overshoot = src[(se>>FRACTION_BITS)-1] / OVERSHOOT_STEP;
if (overshoot < 0) overshoot = -overshoot;
while (count--)
{
if (!cc--)
{
cc=vp->vibrato_control_ratio;
incr=update_vibrato(vp, 0);
}
offset = ofs >> FRACTION_BITS;
if (ofs >= se) {
int32 delta = (int32)((ofs - se)>>FRACTION_BITS) ;
v1 = (int32)src[(int)(se>>FRACTION_BITS)-1];
v1 -= (delta+1) * v1 / overshoot;
}else v1 = (int32)src[offset];
if (ofs + (1L<<FRACTION_BITS) >= se) {
v2 = v1;
}else v2 = (int32)src[offset+1];
if(dont_cspline ||
((ofs-(1L<<FRACTION_BITS))<ls)||((ofs+(2L<<FRACTION_BITS))>le)){
*dest++ = (sample_t)(v1 + ((int32)((v2-v1) * (int32)(ofs & FRACTION_MASK)) >> FRACTION_BITS));
}else{
ofsd=ofs;
v0 = (int32)src[offset-1];
v3 = (int32)src[offset+2];
ofs &= FRACTION_MASK;
temp=v2;
v2 = (6*v2 +
(((( ( (5*v3 - 11*v2 + 7*v1 - v0)*
(int32)ofs) >>FRACTION_BITS)*(int32)ofs)>>(FRACTION_BITS+2))-1))*(int32)ofs;
ofs = (1L << FRACTION_BITS) - ofs;
v1 = (6*v1 +
((((((5*v0 - 11*v1 + 7*temp - v3)*
(int32)ofs)>>FRACTION_BITS)*(int32)ofs)>>(FRACTION_BITS+2))-1))*(int32)ofs;
v1 = (v1 + v2)/(6L<<FRACTION_BITS);
*dest++ = (sample_t)((v1 > MAX_DATAVAL)? MAX_DATAVAL: ((v1 < MIN_DATAVAL)? MIN_DATAVAL: v1));
ofs=ofsd;
}
ofs += incr;
if (ofs >= se + (overshoot << FRACTION_BITS))
{
if (!(vp->status&VOICE_FREE))
{
vp->status=VOICE_FREE;
ctl->note(v);
}
*countptr-=count+1;
break;
}
}
vp->vibrato_control_counter=cc;
vp->sample_increment=incr;
vp->sample_offset=ofs; /* Update offset */
return resample_buffer+resample_buffer_offset;
}
static sample_t *rs_vib_loop(int v, Voice *vp, uint32 *countptr)
{
/* Play sample until end-of-loop, skip back and continue. */
int32 ofsd, v0, v1, v2, v3, temp, overshoot;
int offset;
int32
incr=vp->sample_increment;
/*WHY int32??*/
uint32
#if defined(LAGRANGE_INTERPOLATION) || defined(CSPLINE_INTERPOLATION)
ls=vp->loop_start,
#endif /* LAGRANGE_INTERPOLATION */
le=vp->loop_end,
ll=le - vp->loop_start;
sample_t
*dest=resample_buffer+resample_buffer_offset,
*src=vp->sample->data;
uint32
ofs=vp->sample_offset,
se=vp->sample->data_length,
count = *countptr;
uint32
cc=vp->vibrato_control_counter;
int
flag_exit_loop;
flag_exit_loop =
(vp->status & (VOICE_FREE | VOICE_DIE)) ||
((vp->status & VOICE_OFF) && (vp->sample->modes & MODES_FAST_RELEASE) ) ||
((vp->status & VOICE_OFF) && dont_keep_looping ) ;
overshoot = src[(se>>FRACTION_BITS)-1] / OVERSHOOT_STEP;
if (overshoot < 0) overshoot = -overshoot;
while (count--)
{
if (!cc--)
{
cc=vp->vibrato_control_ratio;
incr=update_vibrato(vp, 0);
}
offset = ofs >> FRACTION_BITS;
if (ofs >= se) {
int32 delta = (int32)((ofs - se)>>FRACTION_BITS) ;
v1 = (int32)src[(int)(se>>FRACTION_BITS)-1];
v1 -= (delta+1) * v1 / overshoot;
}else v1 = (int32)src[offset];
if (ofs + (1L<<FRACTION_BITS) >= se) {
v2 = v1;
}else v2 = (int32)src[offset+1];
if(dont_cspline ||
((ofs-(1L<<FRACTION_BITS))<ls)||((ofs+(2L<<FRACTION_BITS))>le)){
*dest++ = (sample_t)(v1 + ((int32)((v2-v1) * (int32)(ofs & FRACTION_MASK)) >> FRACTION_BITS));
}else{
ofsd=ofs;
v0 = (int32)src[offset-1];
v3 = (int32)src[offset+2];
ofs &= FRACTION_MASK;
temp=v2;
v2 = (6*v2 +
(((( ( (5*v3 - 11*v2 + 7*v1 - v0)*
(int32)ofs) >>FRACTION_BITS)*(int32)ofs)>>(FRACTION_BITS+2))-1))*(int32)ofs;
ofs = (1L << FRACTION_BITS) - ofs;
v1 = (6*v1 +
((((((5*v0 - 11*v1 + 7*temp - v3)*
(int32)ofs)>>FRACTION_BITS)*(int32)ofs)>>(FRACTION_BITS+2))-1))*(int32)ofs;
v1 = (v1 + v2)/(6L<<FRACTION_BITS);
*dest++ = (sample_t)((v1 > MAX_DATAVAL)? MAX_DATAVAL: ((v1 < MIN_DATAVAL)? MIN_DATAVAL: v1));
ofs=ofsd;
}
ofs += incr;
if (ofs>=le)
{
if (flag_exit_loop)
{
vp->echo_delay -= ll >> FRACTION_BITS;
if (vp->echo_delay >= 0) ofs -= ll;
}
else ofs -= ll; /* Hopefully the loop is longer than an increment. */
}
if (ofs >= se + (overshoot << FRACTION_BITS))
{
if (!(vp->status&VOICE_FREE))
{
vp->status=VOICE_FREE;
ctl->note(v);
}
*countptr-=count+1;
break;
}
}
vp->vibrato_control_counter=cc;
vp->sample_increment=incr;
vp->sample_offset=ofs; /* Update offset */
return resample_buffer+resample_buffer_offset;
}
static sample_t *rs_vib_bidir(int v, Voice *vp, uint32 count)
{
int32 ofsd, v0, v1, v2, v3, temp, overshoot;
int offset;
int32
incr=vp->sample_increment;
/*WHY int32??*/
uint32
le=vp->loop_end,
ls=vp->loop_start;
uint32
ofs=vp->sample_offset,
se=vp->sample->data_length;
sample_t
*dest=resample_buffer+resample_buffer_offset,
*src=vp->sample->data;
uint32
cc=vp->vibrato_control_counter;
#ifdef USE_BIDIR_OVERSHOOT
uint32
le2=le<<1,
ls2=ls<<1;
#endif
uint32
i, j;
int
vibflag = 0;
overshoot = src[(se>>FRACTION_BITS)-1] / OVERSHOOT_STEP;
if (overshoot < 0) overshoot = -overshoot;
/* Play normally until inside the loop region */
while (count && (ofs <= ls))
{
i = (ls - ofs) / incr + 1;
if (i > count) i = count;
if (i > cc)
{
i = cc;
vibflag = 1;
}
else cc -= i;
count -= i;
for(j = 0; j < i; j++)
{
offset = ofs >> FRACTION_BITS;
if (ofs >= se) {
int32 delta = (int32)((ofs - se)>>FRACTION_BITS) ;
v1 = (int32)src[(int)(se>>FRACTION_BITS)-1];
v1 -= (delta+1) * v1 / overshoot;
}else v1 = (int32)src[offset];
if (ofs + (1L<<FRACTION_BITS) >= se) {
v2 = v1;
}else v2 = (int32)src[offset+1];
if(dont_cspline ||
((ofs-(1L<<FRACTION_BITS))<ls)||((ofs+(2L<<FRACTION_BITS))>le)){
*dest++ = (sample_t)(v1 + ((int32)((v2-v1) * (int32)(ofs & FRACTION_MASK)) >> FRACTION_BITS));
}else{
ofsd=ofs;
v0 = (int32)src[offset-1];
v3 = (int32)src[offset+2];
ofs &= FRACTION_MASK;
temp=v2;
v2 = (6*v2 +
(((( ( (5*v3 - 11*v2 + 7*v1 - v0)*
(int32)ofs) >>FRACTION_BITS)*(int32)ofs)>>(FRACTION_BITS+2))-1))*(int32)ofs;
ofs = (1L << FRACTION_BITS) - ofs;
v1 = (6*v1 +
((((((5*v0 - 11*v1 + 7*temp - v3)*
(int32)ofs)>>FRACTION_BITS)*(int32)ofs)>>(FRACTION_BITS+2))-1))*(int32)ofs;
v1 = (v1 + v2)/(6L<<FRACTION_BITS);
*dest++ = (sample_t)((v1 > MAX_DATAVAL)? MAX_DATAVAL: ((v1 < MIN_DATAVAL)? MIN_DATAVAL: v1));
ofs=ofsd;
}
ofs += incr;
}
if (vibflag)
{
cc = vp->vibrato_control_ratio;
incr = update_vibrato(vp, 0);
vibflag = 0;
}
}
/* Then do the bidirectional looping */
while (count)
{
/* Precalc how many times we should go through the loop */
#if 1
i = ((incr > 0 ? le : ls) - ofs) / incr + 1;
#else
/* fix from M. Izumo */
i = ((incr > 0 ? le : ls) - ofs + incr - 1) / incr;
#endif
if(i > count) i = count;
if(i > cc)
{
i = cc;
vibflag = 1;
}
else cc -= i;
count -= i;
while (i-- && ofs < se)
{
offset = ofs >> FRACTION_BITS;
if (ofs >= se) {
int32 delta = (int32)((ofs - se)>>FRACTION_BITS) ;
v1 = (int32)src[(int)(se>>FRACTION_BITS)-1];
v1 -= (delta+1) * v1 / overshoot;
}else v1 = (int32)src[offset];
if (ofs + (1L<<FRACTION_BITS) >= se) {
v2 = v1;
}else v2 = (int32)src[offset+1];
if(dont_cspline ||
((ofs-(1L<<FRACTION_BITS))<ls)||((ofs+(2L<<FRACTION_BITS))>le)){
*dest++ = (sample_t)(v1 + ((int32)((v2-v1) * (int32)(ofs & FRACTION_MASK)) >> FRACTION_BITS));
}else{
ofsd=ofs;
v0 = (int32)src[offset-1];
v3 = (int32)src[offset+2];
ofs &= FRACTION_MASK;
temp=v2;
v2 = (6*v2 +
(((( ( (5*v3 - 11*v2 + 7*v1 - v0)*
(int32)ofs) >>FRACTION_BITS)*(int32)ofs)>>(FRACTION_BITS+2))-1))*(int32)ofs;
ofs = (1L << FRACTION_BITS) - ofs;
v1 = (6*v1 +
((((((5*v0 - 11*v1 + 7*temp - v3)*
(int32)ofs)>>FRACTION_BITS)*(int32)ofs)>>(FRACTION_BITS+2))-1))*(int32)ofs;
v1 = (v1 + v2)/(6L<<FRACTION_BITS);
*dest++ = (sample_t)((v1 > MAX_DATAVAL)? MAX_DATAVAL: ((v1 < MIN_DATAVAL)? MIN_DATAVAL: v1));
ofs=ofsd;
}
ofs += incr;
}
if (vibflag)
{
cc = vp->vibrato_control_ratio;
incr = update_vibrato(vp, (incr < 0));
vibflag = 0;
}
if (ofs >= le)
{
#ifdef USE_BIDIR_OVERSHOOT
/* fold the overshoot back in */
ofs = le2 - ofs;
#endif
incr *= -1;
}
else if (ofs <= ls)
{
#ifdef USE_BIDIR_OVERSHOOT
ofs = ls2 - ofs;
#endif
incr *= -1;
}
}
vp->vibrato_control_counter=cc;
vp->sample_increment=incr;
vp->sample_offset=ofs; /* Update offset */
return resample_buffer+resample_buffer_offset;
}
static int rs_update_porta(int v)
{
Voice *vp=&voice[v];
int32 d;
d = vp->porta_dpb;
if(vp->porta_pb < 0)
{
if(d > -vp->porta_pb)
d = -vp->porta_pb;
}
else
{
if(d > vp->porta_pb)
d = -vp->porta_pb;
else
d = -d;
}
vp->porta_pb += d;
if(vp->porta_pb == 0)
{
vp->porta_control_ratio = 0;
vp->porta_pb = 0;
}
recompute_freq(v);
return vp->porta_control_ratio;
}
static sample_t *porta_resample_voice(int v, uint32 *countptr, int mode)
{
Voice *vp=&voice[v];
uint32 n = *countptr;
uint32 i;
sample_t *(* resampler)(int, uint32 *, int);
int cc = vp->porta_control_counter;
int loop;
if(vp->vibrato_control_ratio)
resampler = vib_resample_voice;