quakeforge/libs/audio/renderer/snd_mix.c

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/*
snd_mix.c
portable code to mix sounds for snd_dma.c
Copyright (C) 1996-1997 Id Software, Inc.
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:
Free Software Foundation, Inc.
59 Temple Place - Suite 330
Boston, MA 02111-1307, USA
*/
#ifdef HAVE_CONFIG_H
# include "config.h"
#endif
static __attribute__ ((unused)) const char rcsid[] =
"$Id$";
#ifdef HAVE_STRING_H
# include <string.h>
#endif
#ifdef HAVE_STRINGS_H
# include <strings.h>
#endif
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#include "winquake.h"
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#include "QF/cvar.h"
#include "QF/sound.h"
#include "QF/sys.h"
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#include "compat.h"
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#include "snd_render.h"
#define PAINTBUFFER_SIZE 512
portable_samplepair_t paintbuffer[PAINTBUFFER_SIZE * 2];
int max_overpaint; // number of extra samples painted
// due to phase shift
int snd_scaletable[32][256];
int *snd_p, snd_linear_count, snd_vol;
short *snd_out;
void
SND_WriteLinearBlastStereo16 (void)
{
int val, i;
for (i = 0; i < snd_linear_count; i += 2) {
val = (snd_p[i] * snd_vol) >> 8;
if (val > 0x7fff)
snd_out[i] = 0x7fff;
else if (val < (short) 0x8000)
snd_out[i] = (short) 0x8000;
else
snd_out[i] = val;
val = (snd_p[i + 1] * snd_vol) >> 8;
if (val > 0x7fff)
snd_out[i + 1] = 0x7fff;
else if (val < (short) 0x8000)
snd_out[i + 1] = (short) 0x8000;
else
snd_out[i + 1] = val;
}
}
static void
SND_TransferStereo16 (int endtime)
{
int lpaintedtime, lpos;
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unsigned long *pbuf;
snd_vol = volume->value * 256;
snd_p = (int *) paintbuffer;
lpaintedtime = paintedtime;
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pbuf = (unsigned long *) shm->buffer;
while (lpaintedtime < endtime) {
// handle recirculating buffer issues
lpos = lpaintedtime & ((shm->samples >> 1) - 1);
snd_out = (short *) pbuf + (lpos << 1);
snd_linear_count = (shm->samples >> 1) - lpos;
if (lpaintedtime + snd_linear_count > endtime)
snd_linear_count = endtime - lpaintedtime;
snd_linear_count <<= 1;
// write a linear blast of samples
SND_WriteLinearBlastStereo16 ();
snd_p += snd_linear_count;
lpaintedtime += (snd_linear_count >> 1);
}
}
static void
SND_TransferPaintBuffer (int endtime)
{
int count, out_idx, out_mask, snd_vol, step, val;
int *p;
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unsigned long *pbuf;
if (shm->samplebits == 16 && shm->channels == 2) {
SND_TransferStereo16 (endtime);
return;
}
p = (int *) paintbuffer;
count = (endtime - paintedtime) * shm->channels;
out_mask = shm->samples - 1;
out_idx = paintedtime * shm->channels & out_mask;
step = 3 - shm->channels;
snd_vol = volume->value * 256;
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pbuf = (unsigned long *) shm->buffer;
if (shm->samplebits == 16) {
short *out = (short *) pbuf;
while (count--) {
val = (*p * snd_vol) >> 8;
p += step;
if (val > 0x7fff)
val = 0x7fff;
else if (val < (short) 0x8000)
val = (short) 0x8000;
out[out_idx] = val;
out_idx = (out_idx + 1) & out_mask;
}
} else if (shm->samplebits == 8) {
unsigned char *out = (unsigned char *) pbuf;
while (count--) {
val = (*p * snd_vol) >> 8;
p += step;
if (val > 0x7fff)
val = 0x7fff;
else if (val < (short) 0x8000)
val = (short) 0x8000;
out[out_idx] = (val >> 8) + 128;
out_idx = (out_idx + 1) & out_mask;
}
}
}
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/* CHANNEL MIXING */
void
SND_PaintChannels (int endtime)
{
int end, ltime, count, i;
channel_t *ch;
sfxbuffer_t *sc;
while (paintedtime < endtime) {
// if paintbuffer is smaller than DMA buffer
end = endtime;
if (endtime - paintedtime > PAINTBUFFER_SIZE)
end = paintedtime + PAINTBUFFER_SIZE;
// clear the paint buffer
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// memset (paintbuffer, 0, (end - paintedtime) *
// sizeof (portable_samplepair_t));
max_overpaint = 0;
// paint in the channels.
ch = channels;
for (i = 0; i < total_channels; i++, ch++) {
if (!ch->sfx)
continue;
if (!ch->leftvol && !ch->rightvol)
continue;
sc = ch->sfx->retain (ch->sfx);
if (!sc)
continue;
ltime = paintedtime;
while (ltime < end) { // paint up to end
if (ch->end < end)
count = ch->end - ltime;
else
count = end - ltime;
if (count > 0) {
sc->paint (ch, sc, count);
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if (sc->advance)
sc->advance (sc, count);
ltime += count;
}
// if at end of loop, restart
if (ltime >= ch->end) {
if (ch->sfx->loopstart >= 0) {
ch->pos = ch->sfx->loopstart;
ch->end = ltime + ch->sfx->length - ch->pos;
} else { // channel just stopped
ch->sfx->release (ch->sfx);
ch->sfx = NULL;
break;
}
}
}
if (ch->sfx)
ch->sfx->release (ch->sfx);
}
// transfer out according to DMA format
SND_TransferPaintBuffer (end);
memmove (paintbuffer, paintbuffer + end - paintedtime,
max_overpaint * sizeof (paintbuffer[0]));
memset (paintbuffer + max_overpaint, 0, sizeof (paintbuffer)
- max_overpaint * sizeof (paintbuffer[0]));
paintedtime = end;
}
}
void
SND_InitScaletable (void)
{
int i, j;
for (i = 0; i < 32; i++)
for (j = 0; j < 256; j++)
snd_scaletable[i][j] = ((signed char) j) * i * 8;
}
static void
snd_paint_mono_8 (int offs, channel_t *ch, void *bytes, int count)
{
unsigned char *sfx;
int data, i;
int *lscale, *rscale;
portable_samplepair_t *pair;
if (ch->leftvol > 255)
ch->leftvol = 255;
if (ch->rightvol > 255)
ch->rightvol = 255;
lscale = snd_scaletable[ch->leftvol >> 3];
rscale = snd_scaletable[ch->rightvol >> 3];
sfx = (signed char *) bytes;
pair = paintbuffer + offs;
for (i = 0; i < count; i++) {
data = sfx[i];
pair[i].left += lscale[data];
pair[i].right += rscale[data];
}
}
static void
snd_paint_mono_16 (int offs, channel_t *ch, void *bytes, int count)
{
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int leftvol, rightvol;
unsigned int left_phase, right_phase; // Never allowed < 0 anyway
unsigned int i = 0;
signed short *sfx;
portable_samplepair_t *pair;
leftvol = ch->leftvol;
rightvol = ch->rightvol;
max_overpaint = max (abs (ch->phase),
max (abs (ch->oldphase), max_overpaint));
sfx = (signed short *) bytes;
pair = paintbuffer + offs;
if (ch->phase >= 0) {
left_phase = ch->phase;
right_phase = 0;
} else {
left_phase = 0;
right_phase = -ch->phase;
}
if (ch->oldphase != ch->phase) {
unsigned int old_phase_left, old_phase_right;
unsigned int new_phase_left, new_phase_right;
unsigned int count_left, count_right, c;
if (ch->oldphase >= 0) {
old_phase_left = ch->oldphase;
old_phase_right = 0;
} else {
old_phase_left = 0;
old_phase_right = -ch->oldphase;
}
new_phase_left = left_phase;
new_phase_right = right_phase;
if (new_phase_left > old_phase_left)
count_left = 2 * (new_phase_left - old_phase_left);
else
count_left = old_phase_left - new_phase_left;
if (new_phase_right > old_phase_right)
count_right = 2 * (new_phase_right - old_phase_right);
else
count_right = old_phase_right - new_phase_right;
c = min (count, max (count_right, count_left));
count -= c;
while (c) {
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int left = (sfx[i] * leftvol) >> 8;
int right = (sfx[i] * rightvol) >> 8;
if (new_phase_left < old_phase_left) {
if (!(count_left & 1)) {
pair[i + old_phase_left].left += left;
old_phase_left--;
}
count_left--;
} else {
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if (new_phase_left > old_phase_left) {
pair[i + old_phase_left].left += left;
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old_phase_left++;
}
pair[i + old_phase_left].left += left;
}
if (new_phase_right < old_phase_right) {
if (!(count_right & 1)) {
pair[i + old_phase_right].right += right;
old_phase_right--;
}
count_right--;
} else {
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if (new_phase_right > old_phase_right) {
pair[i + old_phase_right].right += right;
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old_phase_right++;
}
pair[i + old_phase_right].right += right;
}
c--;
i++;
}
}
for (i = 0; i < count; i++) {
pair[i + left_phase].left += (sfx[i] * leftvol) >> 8;
pair[i + right_phase].right += (sfx[i] * rightvol) >> 8;
}
}
static void
snd_paint_stereo_8 (int offs, channel_t *ch, void *bytes, int count)
{
byte *samp;
portable_samplepair_t *pair;
int *lscale, *rscale;
if (ch->leftvol > 255)
ch->leftvol = 255;
if (ch->rightvol > 255)
ch->rightvol = 255;
lscale = snd_scaletable[ch->leftvol >> 3];
rscale = snd_scaletable[ch->rightvol >> 3];
samp = bytes;
pair = paintbuffer + offs;
while (count-- > 0) {
pair->left += lscale[*samp++];
pair->right += rscale[*samp++];
pair++;
}
}
static void
snd_paint_stereo_16 (int offs, channel_t *ch, void *bytes, int count)
{
short *samp;
portable_samplepair_t *pair;
int leftvol = ch->leftvol;
int rightvol = ch->rightvol;
samp = (short *) bytes;
pair = paintbuffer + offs;
while (count-- > 0) {
pair->left += (*samp++ * leftvol) >> 8;
pair->right += (*samp++ * rightvol) >> 8;
pair++;
}
}
void
SND_PaintChannelFrom8 (channel_t *ch, sfxbuffer_t *sc, int count)
{
int pos;
byte *samps;
pos = (ch->pos - sc->pos + sc->tail) % sc->length;
if (pos < 0) { // FIXME need a better way to handle shared streams
pos = sc->tail;
ch->pos = sc->pos;
}
samps = sc->data + pos;
if (pos + count > sc->length) {
int sub = sc->length - pos;
snd_paint_mono_8 (0, ch, samps, sub);
snd_paint_mono_8 (sub, ch, sc->data, count - sub);
} else {
snd_paint_mono_8 (0, ch, samps, count);
}
ch->pos += count;
}
void
SND_PaintChannelFrom16 (channel_t *ch, sfxbuffer_t *sc, int count)
{
int pos;
short *samps;
pos = (ch->pos - sc->pos + sc->tail) % sc->length;
if (pos < 0) { // FIXME need a better way to handle shared streams
pos = sc->tail;
ch->pos = sc->pos;
}
samps = (short *) sc->data + pos;
if (pos + count > sc->length) {
int sub = sc->length - pos;
snd_paint_mono_16 (0, ch, samps, sub);
snd_paint_mono_16 (sub, ch, sc->data, count - sub);
} else {
snd_paint_mono_16 (0, ch, samps, count);
}
ch->pos += count;
}
void
SND_PaintChannelStereo8 (channel_t *ch, sfxbuffer_t *sc, int count)
{
int pos;
short *samps;
pos = (ch->pos - sc->pos + sc->tail) % sc->length;
if (pos < 0) { // FIXME need a better way to handle shared streams
pos = sc->tail;
ch->pos = sc->pos;
}
samps = (short *) sc->data + pos;
if (pos + count > sc->length) {
int sub = sc->length - pos;
snd_paint_stereo_8 (0, ch, samps, sub);
snd_paint_stereo_8 (sub, ch, sc->data, count - sub);
} else {
snd_paint_stereo_8 (0, ch, samps, count);
}
ch->pos += count;
}
void
SND_PaintChannelStereo16 (channel_t *ch, sfxbuffer_t *sc, int count)
{
int pos;
int *samps;
pos = (ch->pos - sc->pos + sc->tail) % sc->length;
if (pos < 0) { // FIXME need a better way to handle shared streams
pos = sc->tail;
ch->pos = sc->pos;
}
samps = (int *) sc->data + pos;
if (pos + count > sc->length) {
int sub = sc->length - pos;
snd_paint_stereo_16 (0, ch, samps, sub);
snd_paint_stereo_16 (sub, ch, sc->data, count - sub);
} else {
snd_paint_stereo_16 (0, ch, samps, count);
}
ch->pos += count;
}