gzdoom/src/timidity/mix.cpp

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/*
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
mix.c
*/
#include <math.h>
#include <stdio.h>
#include <stdlib.h>
#include "timidity.h"
#include "templates.h"
namespace Timidity
{
/* Returns 1 if envelope runs out */
int recompute_envelope(Voice *v)
{
int stage;
stage = v->envelope_stage;
if (stage >= ENVELOPES)
{
/* Envelope ran out. */
/* play sampled release */
v->status &= ~(VOICE_SUSTAINING | VOICE_LPE);
v->status |= VOICE_RELEASING | VOICE_STOPPING;
return 1;
}
if (stage == RELEASE && !(v->status & VOICE_RELEASING) && (v->sample->modes & PATCH_SUSTAIN))
{
v->status |= VOICE_SUSTAINING;
/* Freeze envelope until note turns off. Trumpets want this. */
v->envelope_increment = 0;
}
else
{
v->envelope_stage = stage + 1;
if (v->envelope_volume == v->sample->envelope_offset[stage])
{
return recompute_envelope(v);
}
v->envelope_target = v->sample->envelope_offset[stage];
v->envelope_increment = v->sample->envelope_rate[stage];
if (v->envelope_target < v->envelope_volume)
v->envelope_increment = -v->envelope_increment;
}
return 0;
}
void apply_envelope_to_amp(Voice *v)
{
float env_vol = v->attenuation;
float final_amp = v->sample->volume * FINAL_MIX_SCALE;
if (v->tremolo_phase_increment != 0)
{
env_vol *= v->tremolo_volume;
}
env_vol *= v->envelope_volume / float(1 << 30);
// Note: The pan offsets are negative.
v->left_mix = MAX(0.f, (float)calc_gf1_amp(env_vol + v->left_offset) * final_amp);
v->right_mix = MAX(0.f, (float)calc_gf1_amp(env_vol + v->right_offset) * final_amp);
}
static int update_envelope(Voice *v)
{
v->envelope_volume += v->envelope_increment;
if (((v->envelope_increment < 0) && (v->envelope_volume <= v->envelope_target)) ||
((v->envelope_increment > 0) && (v->envelope_volume >= v->envelope_target)))
{
v->envelope_volume = v->envelope_target;
if (recompute_envelope(v))
{
return 1;
}
}
return 0;
}
static void update_tremolo(Voice *v)
{
int depth = v->sample->tremolo_depth << 7;
if (v->tremolo_sweep != 0)
{
/* Update sweep position */
v->tremolo_sweep_position += v->tremolo_sweep;
if (v->tremolo_sweep_position >= (1 << SWEEP_SHIFT))
{
/* Swept to max amplitude */
v->tremolo_sweep = 0;
}
else
{
/* Need to adjust depth */
depth *= v->tremolo_sweep_position;
depth >>= SWEEP_SHIFT;
}
}
v->tremolo_phase += v->tremolo_phase_increment;
v->tremolo_volume = (float)
(1.0 - FSCALENEG((sine(v->tremolo_phase >> RATE_SHIFT) + 1.0)
* depth * TREMOLO_AMPLITUDE_TUNING,
17));
/* I'm not sure about the +1.0 there -- it makes tremoloed voices'
volumes on average the lower the higher the tremolo amplitude. */
}
/* Returns 1 if the note died */
static int update_signal(Voice *v)
{
if (v->envelope_increment != 0 && update_envelope(v))
{
return 1;
}
if (v->tremolo_phase_increment != 0)
{
update_tremolo(v);
}
apply_envelope_to_amp(v);
return 0;
}
static void mix_mystery_signal(SDWORD control_ratio, const sample_t *sp, float *lp, Voice *v, int count)
{
final_volume_t
left = v->left_mix,
right = v->right_mix;
int cc;
sample_t s;
if (!(cc = v->control_counter))
{
cc = control_ratio;
if (update_signal(v))
return; /* Envelope ran out */
left = v->left_mix;
right = v->right_mix;
}
while (count)
{
if (cc < count)
{
count -= cc;
while (cc--)
{
s = *sp++;
lp[0] += left * s;
lp[1] += right * s;
lp += 2;
}
cc = control_ratio;
if (update_signal(v))
return; /* Envelope ran out */
left = v->left_mix;
right = v->right_mix;
}
else
{
v->control_counter = cc - count;
while (count--)
{
s = *sp++;
lp[0] += left * s;
lp[1] += right * s;
lp += 2;
}
return;
}
}
}
static void mix_single_signal(SDWORD control_ratio, const sample_t *sp, float *lp, Voice *v, float *ampat, int count)
{
final_volume_t amp;
int cc;
if (0 == (cc = v->control_counter))
{
cc = control_ratio;
if (update_signal(v))
return; /* Envelope ran out */
}
amp = *ampat;
while (count)
{
if (cc < count)
{
count -= cc;
while (cc--)
{
lp[0] += *sp++ * amp;
lp += 2;
}
cc = control_ratio;
if (update_signal(v))
return; /* Envelope ran out */
amp = *ampat;
}
else
{
v->control_counter = cc - count;
while (count--)
{
lp[0] += *sp++ * amp;
lp += 2;
}
return;
}
}
}
static void mix_single_left_signal(SDWORD control_ratio, const sample_t *sp, float *lp, Voice *v, int count)
{
mix_single_signal(control_ratio, sp, lp, v, &v->left_mix, count);
}
static void mix_single_right_signal(SDWORD control_ratio, const sample_t *sp, float *lp, Voice *v, int count)
{
mix_single_signal(control_ratio, sp, lp + 1, v, &v->right_mix, count);
}
static void mix_mono_signal(SDWORD control_ratio, const sample_t *sp, float *lp, Voice *v, int count)
{
final_volume_t
left = v->left_mix;
int cc;
if (!(cc = v->control_counter))
{
cc = control_ratio;
if (update_signal(v))
return; /* Envelope ran out */
left = v->left_mix;
}
while (count)
{
if (cc < count)
{
count -= cc;
while (cc--)
{
*lp++ += *sp++ * left;
}
cc = control_ratio;
if (update_signal(v))
return; /* Envelope ran out */
left = v->left_mix;
}
else
{
v->control_counter = cc - count;
while (count--)
{
*lp++ += *sp++ * left;
}
return;
}
}
}
static void mix_mystery(SDWORD control_ratio, const sample_t *sp, float *lp, Voice *v, int count)
{
final_volume_t
left = v->left_mix,
right = v->right_mix;
sample_t s;
while (count--)
{
s = *sp++;
lp[0] += s * left;
lp[1] += s * right;
lp += 2;
}
}
static void mix_single(const sample_t *sp, float *lp, final_volume_t amp, int count)
{
while (count--)
{
lp[0] += *sp++ * amp;
lp += 2;
}
}
static void mix_single_left(const sample_t *sp, float *lp, Voice *v, int count)
{
mix_single(sp, lp, v->left_mix, count);
}
static void mix_single_right(const sample_t *sp, float *lp, Voice *v, int count)
{
mix_single(sp, lp + 1, v->right_mix, count);
}
static void mix_mono(const sample_t *sp, float *lp, Voice *v, int count)
{
final_volume_t
left = v->left_mix;
while (count--)
{
*lp++ += *sp++ * left;
}
}
/* Ramp a note out in c samples */
static void ramp_out(const sample_t *sp, float *lp, Voice *v, int c)
{
final_volume_t left, right, li, ri;
sample_t s = 0; /* silly warning about uninitialized s */
/* Fix by James Caldwell */
if ( c == 0 ) c = 1;
/* printf("Ramping out: left=%d, c=%d, li=%d\n", left, c, li); */
if (v->left_offset == 0) // All the way to the left
{
left = v->left_mix;
li = -(left/c);
if (li == 0) li = -1;
while (c--)
{
left += li;
if (left < 0)
return;
lp[0] += *sp++ * left;
lp += 2;
}
}
else if (v->right_offset == 0) // All the way to the right
{
right = v->right_mix;
ri = -(right/c);
if (ri == 0) ri = -1;
while (c--)
{
right += ri;
if (right < 0)
return;
s = *sp++;
lp[1] += *sp++ * right;
lp += 2;
}
}
else // Somewhere in the middle
{
left = v->left_mix;
li = -(left/c);
if (li == 0) li = -1;
right = v->right_mix;
ri = -(right/c);
if (ri == 0) ri = -1;
right = v->right_mix;
ri = -(right/c);
while (c--)
{
left += li;
right += ri;
if (left < 0)
{
if (right < 0)
{
return;
}
left = 0;
}
else if (right < 0)
{
right = 0;
}
s = *sp++;
lp[0] += s * left;
lp[1] += s * right;
lp += 2;
}
}
}
/**************** interface function ******************/
void mix_voice(Renderer *song, float *buf, Voice *v, int c)
{
int count = c;
sample_t *sp;
if (c < 0)
{
return;
}
if (v->status & VOICE_STOPPING)
{
if (count >= MAX_DIE_TIME)
count = MAX_DIE_TIME;
sp = resample_voice(song, v, &count);
ramp_out(sp, buf, v, count);
v->status = 0;
}
else
{
sp = resample_voice(song, v, &count);
if (count < 0)
{
return;
}
if (v->right_mix == 0) // All the way to the left
{
if (v->envelope_increment != 0 || v->tremolo_phase_increment != 0)
{
mix_single_left_signal(song->control_ratio, sp, buf, v, count);
}
else
{
mix_single_left(sp, buf, v, count);
}
}
else if (v->left_mix == 0) // All the way to the right
{
if (v->envelope_increment != 0 || v->tremolo_phase_increment != 0)
{
mix_single_right_signal(song->control_ratio, sp, buf, v, count);
}
else
{
mix_single_right(sp, buf, v, count);
}
}
else // Somewhere in the middle
{
if (v->envelope_increment || v->tremolo_phase_increment)
{
mix_mystery_signal(song->control_ratio, sp, buf, v, count);
}
else
{
mix_mystery(song->control_ratio, sp, buf, v, count);
}
}
}
}
}