mirror of
https://git.code.sf.net/p/quake/quakeforge
synced 2024-12-11 21:31:30 +00:00
79f3f651a4
Nuclear powered audio ;) More seriously, use _Atomic on a few fields that very obviously need it. That is, channel's buffer pointer (used to signal to the mixer that the channel is ready for use) and "flow control" flags (stop, done and pause), and head and tail in the buffer itself. Since QF has been working without _Atomic (admittedly, thanks to luck and x86's strong memory model), this should do until proven otherwise. I imagine getting stream reading out of the RT thread will highlight any issues.
473 lines
11 KiB
C
473 lines
11 KiB
C
/*
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snd_mix.c
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portable code to mix sounds for snd_dma.c
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Copyright (C) 1996-1997 Id Software, Inc.
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This program is free software; you can redistribute it and/or
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modify it under the terms of the GNU General Public License
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as published by the Free Software Foundation; either version 2
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of the License, or (at your option) any later version.
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This program is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.
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See the GNU General Public License for more details.
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You should have received a copy of the GNU General Public License
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along with this program; if not, write to:
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Free Software Foundation, Inc.
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59 Temple Place - Suite 330
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Boston, MA 02111-1307, USA
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*/
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#ifdef HAVE_CONFIG_H
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# include "config.h"
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#endif
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#ifdef HAVE_STRING_H
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# include <string.h>
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#endif
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#ifdef HAVE_STRINGS_H
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# include <strings.h>
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#endif
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#include "winquake.h"
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#include "QF/cvar.h"
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#include "QF/sound.h"
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#include "QF/sys.h"
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#include "compat.h"
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#include "snd_internal.h"
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#define VOLSCALE 0.5 // so mixing is less likely to overflow
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portable_samplepair_t snd_paintbuffer[PAINTBUFFER_SIZE * 2];
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static int max_overpaint; // number of extra samples painted
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// due to phase shift
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/* CHANNEL MIXING */
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static inline int
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check_channel_end (channel_t *ch, sfxbuffer_t *sb, int count, unsigned ltime)
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{
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if (count <= 0 || ltime >= ch->end) {
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if (ch->loopstart != (unsigned) -1) {
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ch->pos = ch->loopstart;
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ch->end = ltime + sb->sfx_length - ch->pos;
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} else { // channel just stopped
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ch->done = 1;
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return 1;
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}
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}
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return 0;
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}
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static inline void
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snd_paint_channel (channel_t *ch, sfxbuffer_t *sb, int count)
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{
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unsigned pos;
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int offs = 0;
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float *samps;
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if ((int) ch->pos < 0) {
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ch->pos += count;
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if ((int) ch->pos <= 0)
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return;
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offs = count - ch->pos;
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count -= offs;
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ch->pos = 0;
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}
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if (ch->pos < sb->pos || ch->pos - sb->pos >= sb->size)
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sb->setpos (sb, ch->pos);
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pos = (ch->pos - sb->pos + sb->tail) % sb->size;
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samps = sb->data + pos * sb->channels;
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if (pos + count > sb->size) {
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unsigned sub = sb->size - pos;
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sb->paint (offs, ch, samps, sub);
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sb->paint (offs + sub, ch, sb->data, count - sub);
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} else {
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sb->paint (offs, ch, samps, count);
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}
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ch->pos += count;
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}
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void
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SND_PaintChannels (snd_t *snd, unsigned endtime)
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{
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unsigned end, ltime;
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int i, count;
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channel_t *ch;
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sfxbuffer_t *sb;
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// clear the paint buffer
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for (i = 0; i < PAINTBUFFER_SIZE * 2; i++) {
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snd_paintbuffer[i].left = 0;
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snd_paintbuffer[i].right = 0;
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}
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while (snd->paintedtime < endtime) {
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// if snd_paintbuffer is smaller than DMA buffer
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end = endtime;
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if (end - snd->paintedtime > PAINTBUFFER_SIZE)
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end = snd->paintedtime + PAINTBUFFER_SIZE;
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max_overpaint = 0;
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// paint in the channels.
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ch = snd_channels;
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for (i = 0; i < snd_total_channels; i++, ch++) {
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if (!(sb = ch->buffer) || ch->done) {
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// channel is inactive
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continue;
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}
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if (ch->stop) {
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ch->done = 1; // acknowledge stopped signal
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continue;
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}
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if (ch->pause)
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continue;
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if (!ch->end)
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ch->end = snd->paintedtime + sb->sfx_length - ch->pos;
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ltime = snd->paintedtime;
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while (ltime < end) { // paint up to end
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count = ((ch->end < end) ? ch->end : end) - ltime;
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if (count > 0) {
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if (ch->leftvol || ch->rightvol) {
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snd_paint_channel (ch, sb, count);
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if (sb->advance) {
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if (!sb->advance (sb, count)) {
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// this channel can no longer be used as its
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// source has died.
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ch->done = 1;
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break;
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}
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}
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}
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ltime += count;
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}
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if (check_channel_end (ch, sb, count, ltime))
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break;
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}
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}
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// transfer out according to DMA format
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snd->xfer (snd, snd_paintbuffer, end - snd->paintedtime,
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snd_volume);
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memmove (snd_paintbuffer, snd_paintbuffer + end - snd->paintedtime,
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max_overpaint * sizeof (snd_paintbuffer[0]));
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memset (snd_paintbuffer + max_overpaint, 0, sizeof (snd_paintbuffer)
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- max_overpaint * sizeof (snd_paintbuffer[0]));
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snd->paintedtime = end;
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}
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}
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static inline void
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snd_mix_single (portable_samplepair_t *pair, float **samp,
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float lvol, float rvol)
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{
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float single = *(*samp)++;
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pair->left += single * lvol;
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pair->right += single * rvol;
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}
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static inline void
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snd_mix_pair (portable_samplepair_t *pair, float **samp,
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float lvol, float rvol)
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{
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float left = *(*samp)++;
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float right = *(*samp)++;
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pair->left += left * lvol;
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pair->right += right * rvol;
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}
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static inline void
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snd_mix_triple (portable_samplepair_t *pair, float **samp,
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float lvol, float rvol)
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{
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float left = *(*samp)++;
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float center = *(*samp)++;
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float right = *(*samp)++;
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pair->left += left * lvol;
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pair->left += center * lvol;
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pair->right += center * rvol;
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pair->right += right * rvol;
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}
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/* mono
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center
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Spacializes the sound.
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*/
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static void
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snd_paint_mono (int offs, channel_t *ch, float *sfx, unsigned count)
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{
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float leftvol, rightvol;
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unsigned left_phase, right_phase; // Never allowed < 0 anyway
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unsigned i = 0;
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portable_samplepair_t *pair;
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leftvol = ch->leftvol * VOLSCALE;
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rightvol = ch->rightvol * VOLSCALE;
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max_overpaint = max (abs (ch->phase),
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max (abs (ch->oldphase), max_overpaint));
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pair = snd_paintbuffer + offs;
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if (ch->phase >= 0) {
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left_phase = ch->phase;
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right_phase = 0;
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} else {
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left_phase = 0;
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right_phase = -ch->phase;
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}
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if (ch->oldphase != ch->phase) {
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unsigned old_phase_left, old_phase_right;
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unsigned new_phase_left, new_phase_right;
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unsigned count_left, count_right, c;
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if (ch->oldphase >= 0) {
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old_phase_left = ch->oldphase;
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old_phase_right = 0;
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} else {
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old_phase_left = 0;
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old_phase_right = -ch->oldphase;
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}
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new_phase_left = left_phase;
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new_phase_right = right_phase;
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if (new_phase_left > old_phase_left)
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count_left = 2 * (new_phase_left - old_phase_left);
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else
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count_left = old_phase_left - new_phase_left;
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if (new_phase_right > old_phase_right)
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count_right = 2 * (new_phase_right - old_phase_right);
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else
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count_right = old_phase_right - new_phase_right;
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c = min (count, max (count_right, count_left));
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count -= c;
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while (c) {
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float left = sfx[i] * leftvol;
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float right = sfx[i] * rightvol;
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if (new_phase_left < old_phase_left) {
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if (!(count_left & 1)) {
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pair[i + old_phase_left].left += left;
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old_phase_left--;
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}
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count_left--;
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} else {
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if (new_phase_left > old_phase_left) {
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pair[i + old_phase_left].left += left;
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old_phase_left++;
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}
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pair[i + old_phase_left].left += left;
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}
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if (new_phase_right < old_phase_right) {
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if (!(count_right & 1)) {
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pair[i + old_phase_right].right += right;
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old_phase_right--;
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}
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count_right--;
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} else {
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if (new_phase_right > old_phase_right) {
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pair[i + old_phase_right].right += right;
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old_phase_right++;
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}
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pair[i + old_phase_right].right += right;
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}
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c--;
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i++;
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}
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}
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for (i = 0; i < count; i++) {
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pair[i + left_phase].left += sfx[i] * leftvol;
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pair[i + right_phase].right += sfx[i] * rightvol;
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}
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}
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/* stereo
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left, right
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Does not spacialize the sound.
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*/
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static void
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snd_paint_stereo (int offs, channel_t *ch, float *samp, unsigned count)
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{
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portable_samplepair_t *pair;
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float leftvol = ch->leftvol * VOLSCALE;
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float rightvol = ch->rightvol * VOLSCALE;
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pair = snd_paintbuffer + offs;
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while (count-- > 0) {
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snd_mix_pair (pair, &samp, leftvol, rightvol);
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pair++;
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}
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}
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/* 1d surround
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left, center, right
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Does not spacialize the sound.
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*/
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static void
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snd_paint_3 (int offs, channel_t *ch, float *samp, unsigned count)
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{
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portable_samplepair_t *pair;
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float leftvol = ch->leftvol * VOLSCALE;
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float rightvol = ch->rightvol * VOLSCALE;
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pair = snd_paintbuffer + offs;
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while (count-- > 0) {
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snd_mix_triple (pair, &samp, leftvol, rightvol);
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pair++;
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}
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}
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/* quadraphonic surround
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front (left, right),
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rear (left, right)
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Does not spacialize the sound.
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*/
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static void
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snd_paint_4 (int offs, channel_t *ch, float *samp, unsigned count)
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{
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portable_samplepair_t *pair;
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float leftvol = ch->leftvol * VOLSCALE;
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float rightvol = ch->rightvol * VOLSCALE;
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pair = snd_paintbuffer + offs;
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while (count-- > 0) {
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snd_mix_pair (pair, &samp, leftvol, rightvol);
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snd_mix_pair (pair, &samp, leftvol, rightvol);
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pair++;
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}
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}
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/* five-channel surround
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front (left, center, right),
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rear (left, right)
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Does not spacialize the sound.
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*/
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static void
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snd_paint_5 (int offs, channel_t *ch, float *samp, unsigned count)
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{
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portable_samplepair_t *pair;
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float leftvol = ch->leftvol * VOLSCALE;
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float rightvol = ch->rightvol * VOLSCALE;
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pair = snd_paintbuffer + offs;
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while (count-- > 0) {
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snd_mix_triple (pair, &samp, leftvol, rightvol);
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snd_mix_pair (pair, &samp, leftvol, rightvol);
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pair++;
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}
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}
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/* 5.1 surround
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front (left, center, right),
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rear (left, right),
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lfe
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Does not spacialize the sound.
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*/
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static void
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snd_paint_6 (int offs, channel_t *ch, float *samp, unsigned count)
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{
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portable_samplepair_t *pair;
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float leftvol = ch->leftvol * VOLSCALE;
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float rightvol = ch->rightvol * VOLSCALE;
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pair = snd_paintbuffer + offs;
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while (count-- > 0) {
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snd_mix_triple (pair, &samp, leftvol, rightvol);
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snd_mix_pair (pair, &samp, leftvol, rightvol);
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snd_mix_single (pair, &samp, leftvol, rightvol);
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pair++;
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}
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}
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/* 6.1 surround
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front (left, center, right),
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side (left, right),
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rear (center),
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lfe
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Does not spacialize the sound.
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*/
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static void
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snd_paint_7 (int offs, channel_t *ch, float *samp, unsigned count)
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{
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portable_samplepair_t *pair;
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float leftvol = ch->leftvol * VOLSCALE;
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float rightvol = ch->rightvol * VOLSCALE;
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pair = snd_paintbuffer + offs;
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while (count-- > 0) {
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snd_mix_triple (pair, &samp, leftvol, rightvol);
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snd_mix_pair (pair, &samp, leftvol, rightvol);
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snd_mix_single (pair, &samp, leftvol, rightvol);
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snd_mix_single (pair, &samp, leftvol, rightvol);
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pair++;
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}
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}
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/* 7.1 surround
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front (left, center, right),
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side (left, right),
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rear (left, right),
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lfe
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Does not spacialize the sound.
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*/
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static void
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snd_paint_8 (int offs, channel_t *ch, float *samp, unsigned count)
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{
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portable_samplepair_t *pair;
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float leftvol = ch->leftvol * VOLSCALE;
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float rightvol = ch->rightvol * VOLSCALE;
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pair = snd_paintbuffer + offs;
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while (count-- > 0) {
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snd_mix_triple (pair, &samp, leftvol, rightvol);
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snd_mix_pair (pair, &samp, leftvol, rightvol);
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snd_mix_pair (pair, &samp, leftvol, rightvol);
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snd_mix_single (pair, &samp, leftvol, rightvol);
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pair++;
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}
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}
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void
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SND_SetPaint (sfxbuffer_t *sb)
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{
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static sfxpaint_t *painters[] = {
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0,
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snd_paint_mono,
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snd_paint_stereo,
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snd_paint_3,
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snd_paint_4,
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snd_paint_5,
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snd_paint_6,
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snd_paint_7,
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snd_paint_8,
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};
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if (sb->channels > 8 || !sb->channels)
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Sys_Error ("invaliid channel count %d", sb->channels);
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sb->paint = painters[sb->channels];
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}
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