prosperon/source/engine/sound/mix.c

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#include "mix.h"
#include "stddef.h"
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#include "time.h"
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#include "sound.h"
#include "dsp.h"
#include <string.h>
#include "log.h"
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static struct bus bus[256];
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static int first = 0; /* First bus available */
//static struct bus *first_on = NULL;
static int first_on = -1; /* First bus to fill buffer with */
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short mastermix[BUF_FRAMES*CHANNELS];
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void mixer_init() {
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for (int i = 0; i < 256; i++) {
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bus[i].next = i+1;
bus[i].on = 0;
bus[i].id = i;
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}
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bus[255].next = -1;
}
struct bus *first_free_bus(struct dsp_filter in) {
if (first == -1) return NULL;
int ret = first;
first = bus[ret].next;
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bus[ret].on = 1;
bus[ret].in = in;
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if (first_on != -1) bus[first_on].prev = ret;
bus[ret].next = first_on;
bus[ret].prev = -1;
first_on = ret;
return &bus[ret];
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}
void bus_free(struct bus *b)
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{
if (first_on == b->id) first_on = b->next;
if (b->next != -1) bus[b->next].prev = b->prev;
if (b->prev != -1) bus[b->prev].next = b->next;
b->next = first;
first = b->id;
b->on = 0;
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}
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void bus_fill_buffers(short *master, int n) {
int curbus = first_on;
if (curbus == -1) return;
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memset(master, 0, BUF_FRAMES*CHANNELS*sizeof(short));
while (curbus != -1) {
int nextbus = bus[curbus].next; /* Save this in case busses get changed during fill */
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dsp_run(bus[curbus].in, bus[curbus].buf, BUF_FRAMES);
for (int i = 0; i < BUF_FRAMES*CHANNELS; i++)
master[i] += bus[curbus].buf[i];
curbus = nextbus;
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}
}