mirror of
https://github.com/ZDoom/qzdoom.git
synced 2024-12-16 15:31:30 +00:00
d4563767ee
GUS patch flags, envelopes, and volume levels, while trying to be closer to TiMidity++ than original TiMidity. - Renamed timidity_config and timidity_voices to midi_config and midi_voices respectively. SVN r959 (trunk)
618 lines
13 KiB
C++
618 lines
13 KiB
C++
/*
|
|
|
|
TiMidity -- Experimental MIDI to WAVE converter
|
|
Copyright (C) 1995 Tuukka Toivonen <toivonen@clinet.fi>
|
|
|
|
This library 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 library 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 library; if not, write to the Free Software
|
|
Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
|
|
|
|
resample.c
|
|
|
|
*/
|
|
|
|
#include <math.h>
|
|
#include <stdio.h>
|
|
#include <malloc.h>
|
|
|
|
#include "timidity.h"
|
|
#include "c_cvars.h"
|
|
|
|
EXTERN_CVAR(Bool, midi_timiditylike)
|
|
|
|
namespace Timidity
|
|
{
|
|
|
|
#define RESAMPLATION {\
|
|
int o = ofs >> FRACTION_BITS, m = ofs & FRACTION_MASK; \
|
|
*dest++ = src[o] + (src[o + 1] - src[o]) * m / (1 << FRACTION_BITS);\
|
|
}
|
|
|
|
#define FINALINTERP if (ofs == le) *dest++ = src[ofs >> FRACTION_BITS];
|
|
/* So it isn't interpolation. At least it's final. */
|
|
|
|
/*************** resampling with fixed increment *****************/
|
|
|
|
static sample_t *rs_plain(sample_t *resample_buffer, Voice *v, int *countptr)
|
|
{
|
|
/* Play sample until end, then free the voice. */
|
|
|
|
const sample_t
|
|
*src = v->sample->data;
|
|
sample_t
|
|
*dest = resample_buffer;
|
|
int
|
|
ofs = v->sample_offset,
|
|
incr = v->sample_increment,
|
|
le = v->sample->data_length,
|
|
count = *countptr;
|
|
|
|
int i;
|
|
|
|
if (incr < 0) incr = -incr; /* In case we're coming out of a bidir loop */
|
|
|
|
/* Precalc how many times we should go through the loop.
|
|
NOTE: Assumes that incr > 0 and that ofs <= le */
|
|
i = (le - ofs) / incr + 1;
|
|
|
|
if (i > count)
|
|
{
|
|
i = count;
|
|
count = 0;
|
|
}
|
|
else
|
|
{
|
|
count -= i;
|
|
}
|
|
|
|
while (i--)
|
|
{
|
|
RESAMPLATION;
|
|
ofs += incr;
|
|
}
|
|
|
|
if (ofs >= le)
|
|
{
|
|
FINALINTERP;
|
|
v->status = 0;
|
|
*countptr -= count + 1;
|
|
}
|
|
|
|
v->sample_offset = ofs; /* Update offset */
|
|
return resample_buffer;
|
|
}
|
|
|
|
static sample_t *rs_loop(sample_t *resample_buffer, Voice *vp, int count)
|
|
{
|
|
/* Play sample until end-of-loop, skip back and continue. */
|
|
|
|
int
|
|
ofs = vp->sample_offset,
|
|
incr = vp->sample_increment,
|
|
le = vp->sample->loop_end,
|
|
ll = le - vp->sample->loop_start;
|
|
sample_t
|
|
*dest = resample_buffer;
|
|
const sample_t
|
|
*src = vp->sample->data;
|
|
|
|
int i;
|
|
|
|
while (count)
|
|
{
|
|
if (ofs >= le)
|
|
/* NOTE: Assumes that ll > incr and that incr > 0. */
|
|
ofs -= ll;
|
|
/* Precalc how many times we should go through the loop */
|
|
i = (le - ofs) / incr + 1;
|
|
if (i > count)
|
|
{
|
|
i = count;
|
|
count = 0;
|
|
}
|
|
else
|
|
{
|
|
count -= i;
|
|
}
|
|
while (i--)
|
|
{
|
|
RESAMPLATION;
|
|
ofs += incr;
|
|
}
|
|
}
|
|
|
|
vp->sample_offset=ofs; /* Update offset */
|
|
return resample_buffer;
|
|
}
|
|
|
|
static sample_t *rs_bidir(sample_t *resample_buffer, Voice *vp, int count)
|
|
{
|
|
int
|
|
ofs = vp->sample_offset,
|
|
incr = vp->sample_increment,
|
|
le = vp->sample->loop_end,
|
|
ls = vp->sample->loop_start;
|
|
sample_t
|
|
*dest = resample_buffer;
|
|
const sample_t
|
|
*src = vp->sample->data;
|
|
|
|
int
|
|
le2 = le << 1,
|
|
ls2 = ls << 1,
|
|
i;
|
|
/* Play normally until inside the loop region */
|
|
|
|
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. */
|
|
i = (ls - ofs) / incr + 1;
|
|
if (i > count)
|
|
{
|
|
i = count;
|
|
count = 0;
|
|
}
|
|
else
|
|
{
|
|
count -= i;
|
|
}
|
|
while (i--)
|
|
{
|
|
RESAMPLATION;
|
|
ofs += incr;
|
|
}
|
|
}
|
|
|
|
/* Then do the bidirectional looping */
|
|
|
|
while(count)
|
|
{
|
|
/* Precalc how many times we should go through the loop */
|
|
i = ((incr > 0 ? le : ls) - ofs) / incr + 1;
|
|
if (i > count)
|
|
{
|
|
i = count;
|
|
count = 0;
|
|
}
|
|
else
|
|
{
|
|
count -= i;
|
|
}
|
|
while (i--)
|
|
{
|
|
RESAMPLATION;
|
|
ofs += incr;
|
|
}
|
|
if (ofs >= le)
|
|
{
|
|
/* fold the overshoot back in */
|
|
ofs = le2 - ofs;
|
|
incr *= -1;
|
|
}
|
|
else if (ofs <= ls)
|
|
{
|
|
ofs = ls2 - ofs;
|
|
incr *= -1;
|
|
}
|
|
}
|
|
|
|
vp->sample_increment = incr;
|
|
vp->sample_offset = ofs; /* Update offset */
|
|
return resample_buffer;
|
|
}
|
|
|
|
/*********************** vibrato versions ***************************/
|
|
|
|
/* We only need to compute one half of the vibrato sine cycle */
|
|
static int vib_phase_to_inc_ptr(int phase)
|
|
{
|
|
if (phase < VIBRATO_SAMPLE_INCREMENTS / 2)
|
|
return VIBRATO_SAMPLE_INCREMENTS / 2 - 1 - phase;
|
|
else if (phase >= VIBRATO_SAMPLE_INCREMENTS * 3 / 2)
|
|
return VIBRATO_SAMPLE_INCREMENTS * 5 / 2 - 1 - phase;
|
|
else
|
|
return phase - VIBRATO_SAMPLE_INCREMENTS / 2;
|
|
}
|
|
|
|
static int update_vibrato(float output_rate, Voice *vp, int sign)
|
|
{
|
|
int depth;
|
|
int phase;
|
|
double a, pb;
|
|
|
|
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->sample->vibrato_depth << 7;
|
|
|
|
if (vp->vibrato_sweep != 0)
|
|
{
|
|
/* 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;
|
|
}
|
|
}
|
|
|
|
a = FSCALE(((double)(vp->sample->sample_rate) * vp->frequency) /
|
|
((double)(vp->sample->root_freq) * output_rate),
|
|
FRACTION_BITS);
|
|
|
|
pb = (sine(vp->vibrato_phase * (1.0/(2*VIBRATO_SAMPLE_INCREMENTS)))
|
|
* (double)(depth) * VIBRATO_AMPLITUDE_TUNING);
|
|
|
|
a *= pow(2.0, pb / (8192 * 12.f));
|
|
|
|
/* If the sweep's over, we can store the newly computed sample_increment */
|
|
if (!vp->vibrato_sweep)
|
|
vp->vibrato_sample_increment[phase] = (int) a;
|
|
|
|
if (sign)
|
|
a = -a; /* need to preserve the loop direction */
|
|
|
|
return (int) a;
|
|
}
|
|
|
|
static sample_t *rs_vib_plain(sample_t *resample_buffer, float rate, Voice *vp, int *countptr)
|
|
{
|
|
/* Play sample until end, then free the voice. */
|
|
|
|
sample_t
|
|
*dest = resample_buffer;
|
|
const sample_t
|
|
*src = vp->sample->data;
|
|
int
|
|
le = vp->sample->data_length,
|
|
ofs = vp->sample_offset,
|
|
incr = vp->sample_increment,
|
|
count = *countptr;
|
|
int
|
|
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 */
|
|
|
|
while (count--)
|
|
{
|
|
if (!cc--)
|
|
{
|
|
cc = vp->vibrato_control_ratio;
|
|
incr = update_vibrato(rate, vp, 0);
|
|
}
|
|
RESAMPLATION;
|
|
ofs += incr;
|
|
if (ofs >= le)
|
|
{
|
|
FINALINTERP;
|
|
vp->status = 0;
|
|
*countptr -= count+1;
|
|
break;
|
|
}
|
|
}
|
|
|
|
vp->vibrato_control_counter = cc;
|
|
vp->sample_increment = incr;
|
|
vp->sample_offset = ofs; /* Update offset */
|
|
return resample_buffer;
|
|
}
|
|
|
|
static sample_t *rs_vib_loop(sample_t *resample_buffer, float rate, Voice *vp, int count)
|
|
{
|
|
/* Play sample until end-of-loop, skip back and continue. */
|
|
|
|
int
|
|
ofs = vp->sample_offset,
|
|
incr = vp->sample_increment,
|
|
le = vp->sample->loop_end,
|
|
ll = le - vp->sample->loop_start;
|
|
sample_t
|
|
*dest = resample_buffer;
|
|
const sample_t
|
|
*src = vp->sample->data;
|
|
int
|
|
cc = vp->vibrato_control_counter;
|
|
|
|
int i;
|
|
int
|
|
vibflag=0;
|
|
|
|
while (count)
|
|
{
|
|
/* Hopefully the loop is longer than an increment */
|
|
if (ofs >= le)
|
|
ofs -= ll;
|
|
/* Precalc how many times to go through the loop, taking
|
|
the vibrato control ratio into account this time. */
|
|
i = (le - ofs) / incr + 1;
|
|
if (i > count) i = count;
|
|
if (i > cc)
|
|
{
|
|
i = cc;
|
|
vibflag = 1;
|
|
}
|
|
else
|
|
{
|
|
cc -= i;
|
|
}
|
|
count -= i;
|
|
while (i--)
|
|
{
|
|
RESAMPLATION;
|
|
ofs += incr;
|
|
}
|
|
if (vibflag)
|
|
{
|
|
cc = vp->vibrato_control_ratio;
|
|
incr = update_vibrato(rate, vp, 0);
|
|
vibflag = 0;
|
|
}
|
|
}
|
|
|
|
vp->vibrato_control_counter = cc;
|
|
vp->sample_increment = incr;
|
|
vp->sample_offset = ofs; /* Update offset */
|
|
return resample_buffer;
|
|
}
|
|
|
|
static sample_t *rs_vib_bidir(sample_t *resample_buffer, float rate, Voice *vp, int count)
|
|
{
|
|
int
|
|
ofs = vp->sample_offset,
|
|
incr = vp->sample_increment,
|
|
le = vp->sample->loop_end,
|
|
ls = vp->sample->loop_start;
|
|
sample_t
|
|
*dest = resample_buffer;
|
|
const sample_t
|
|
*src = vp->sample->data;
|
|
int
|
|
cc = vp->vibrato_control_counter;
|
|
|
|
int
|
|
le2 = le << 1,
|
|
ls2 = ls << 1,
|
|
i;
|
|
int
|
|
vibflag = 0;
|
|
|
|
/* 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;
|
|
while (i--)
|
|
{
|
|
RESAMPLATION;
|
|
ofs += incr;
|
|
}
|
|
if (vibflag)
|
|
{
|
|
cc = vp->vibrato_control_ratio;
|
|
incr = update_vibrato(rate, vp, 0);
|
|
vibflag = 0;
|
|
}
|
|
}
|
|
|
|
/* Then do the bidirectional looping */
|
|
|
|
while (count)
|
|
{
|
|
/* Precalc how many times we should go through the loop */
|
|
i = ((incr > 0 ? le : ls) - ofs) / incr + 1;
|
|
if(i > count)
|
|
{
|
|
i = count;
|
|
}
|
|
if(i > cc)
|
|
{
|
|
i = cc;
|
|
vibflag = 1;
|
|
}
|
|
else
|
|
{
|
|
cc -= i;
|
|
}
|
|
count -= i;
|
|
while (i--)
|
|
{
|
|
RESAMPLATION;
|
|
ofs += incr;
|
|
}
|
|
if (vibflag)
|
|
{
|
|
cc = vp->vibrato_control_ratio;
|
|
incr = update_vibrato(rate, vp, (incr < 0));
|
|
vibflag = 0;
|
|
}
|
|
if (ofs >= le)
|
|
{
|
|
/* fold the overshoot back in */
|
|
ofs = le2 - ofs;
|
|
incr *= -1;
|
|
}
|
|
else if (ofs <= ls)
|
|
{
|
|
ofs = ls2 - ofs;
|
|
incr *= -1;
|
|
}
|
|
}
|
|
|
|
vp->vibrato_control_counter = cc;
|
|
vp->sample_increment = incr;
|
|
vp->sample_offset = ofs; /* Update offset */
|
|
return resample_buffer;
|
|
}
|
|
|
|
sample_t *resample_voice(Renderer *song, Voice *vp, int *countptr)
|
|
{
|
|
int ofs;
|
|
WORD modes;
|
|
|
|
if (vp->sample->sample_rate == 0)
|
|
{
|
|
/* Pre-resampled data -- just update the offset and check if
|
|
we're out of data. */
|
|
ofs = vp->sample_offset >> FRACTION_BITS; /* Kind of silly to use FRACTION_BITS here... */
|
|
if (*countptr >= (vp->sample->data_length >> FRACTION_BITS) - ofs)
|
|
{
|
|
/* Note finished. Free the voice. */
|
|
vp->status = 0;
|
|
|
|
/* Let the caller know how much data we had left */
|
|
*countptr = (vp->sample->data_length >> FRACTION_BITS) - ofs;
|
|
}
|
|
else
|
|
{
|
|
vp->sample_offset += *countptr << FRACTION_BITS;
|
|
}
|
|
return vp->sample->data + ofs;
|
|
}
|
|
|
|
/* Need to resample. Use the proper function. */
|
|
modes = vp->sample->modes;
|
|
|
|
if (vp->status & VOICE_LPE)
|
|
{
|
|
if (vp->sample->loop_end - vp->sample->loop_start < 2)
|
|
{ // Loop is too short; turn it off.
|
|
vp->status &= ~VOICE_LPE;
|
|
}
|
|
}
|
|
|
|
if (vp->vibrato_control_ratio)
|
|
{
|
|
if (vp->status & VOICE_LPE && !(midi_timiditylike && vp->sample->modes & PATCH_T_NO_LOOP))
|
|
{
|
|
if (modes & PATCH_BIDIR)
|
|
return rs_vib_bidir(song->resample_buffer, song->rate, vp, *countptr);
|
|
else
|
|
return rs_vib_loop(song->resample_buffer, song->rate, vp, *countptr);
|
|
}
|
|
else
|
|
{
|
|
return rs_vib_plain(song->resample_buffer, song->rate, vp, countptr);
|
|
}
|
|
}
|
|
else
|
|
{
|
|
if (vp->status & VOICE_LPE && !(midi_timiditylike && vp->sample->modes & PATCH_T_NO_LOOP))
|
|
{
|
|
if (modes & PATCH_BIDIR)
|
|
return rs_bidir(song->resample_buffer, vp, *countptr);
|
|
else
|
|
return rs_loop(song->resample_buffer, vp, *countptr);
|
|
}
|
|
else
|
|
{
|
|
return rs_plain(song->resample_buffer, vp, countptr);
|
|
}
|
|
}
|
|
}
|
|
|
|
void pre_resample(Renderer *song, Sample *sp)
|
|
{
|
|
double a, xdiff;
|
|
int incr, ofs, newlen, count;
|
|
sample_t *newdata, *dest, *src = sp->data;
|
|
sample_t v1, v2, v3, v4, *vptr;
|
|
static const char note_name[12][3] =
|
|
{
|
|
"C", "C#", "D", "D#", "E", "F", "F#", "G", "G#", "A", "A#", "B"
|
|
};
|
|
|
|
if (sp->scale_factor != 0)
|
|
return;
|
|
|
|
cmsg(CMSG_INFO, VERB_NOISY, " * pre-resampling for note %d (%s%d)\n",
|
|
sp->scale_note,
|
|
note_name[sp->scale_note % 12], (sp->scale_note & 0x7F) / 12);
|
|
|
|
a = (sp->sample_rate * note_to_freq(sp->scale_note)) / (sp->root_freq * song->rate);
|
|
if (a <= 0)
|
|
return;
|
|
newlen = (int)(sp->data_length / a);
|
|
if (newlen < 0 || (newlen >> FRACTION_BITS) > MAX_SAMPLE_SIZE)
|
|
return;
|
|
|
|
count = newlen >> FRACTION_BITS;
|
|
dest = newdata = (sample_t *)safe_malloc(count * sizeof(float));
|
|
|
|
ofs = incr = (sp->data_length - (1 << FRACTION_BITS)) / count;
|
|
|
|
if (--count)
|
|
*dest++ = src[0];
|
|
|
|
/* Since we're pre-processing and this doesn't have to be done in
|
|
real-time, we go ahead and do the full sliding cubic interpolation. */
|
|
while (--count)
|
|
{
|
|
vptr = src + (ofs >> FRACTION_BITS);
|
|
v1 = (vptr == src) ? *vptr : *(vptr - 1);
|
|
v2 = *vptr;
|
|
v3 = *(vptr + 1);
|
|
v4 = *(vptr + 2);
|
|
xdiff = FSCALENEG(ofs & FRACTION_MASK, FRACTION_BITS);
|
|
*dest++ = sample_t(v2 + (xdiff / 6.0) * (-2 * v1 - 3 * v2 + 6 * v3 - v4 +
|
|
xdiff * (3 * (v1 - 2 * v2 + v3) + xdiff * (-v1 + 3 * (v2 - v3) + v4))));
|
|
ofs += incr;
|
|
}
|
|
|
|
if (ofs & FRACTION_MASK)
|
|
{
|
|
RESAMPLATION
|
|
}
|
|
else
|
|
{
|
|
*dest++ = src[ofs >> FRACTION_BITS];
|
|
}
|
|
|
|
sp->data_length = newlen;
|
|
sp->loop_start = int(sp->loop_start / a);
|
|
sp->loop_end = int(sp->loop_end / a);
|
|
free(sp->data);
|
|
sp->data = newdata;
|
|
sp->sample_rate = 0;
|
|
}
|
|
|
|
}
|