85 lines
1.8 KiB
C
85 lines
1.8 KiB
C
#include "mix.h"
|
|
#include "stddef.h"
|
|
#include "time.h"
|
|
#include "sound.h"
|
|
#include "dsp.h"
|
|
#include <string.h>
|
|
#include "log.h"
|
|
|
|
#include <assert.h>
|
|
|
|
static struct bus bus[256];
|
|
static int first = 0; /* First bus available */
|
|
//static struct bus *first_on = NULL;
|
|
static int first_on = -1; /* First bus to fill buffer with */
|
|
short mastermix[BUF_FRAMES*CHANNELS];
|
|
|
|
static int initted = 0;
|
|
|
|
static float master_volume = 1.f;
|
|
|
|
void mix_master_vol(float v) {
|
|
if (v < 0.f) v = 0.f;
|
|
if (v > 100.f) v = 100.f;
|
|
master_volume = v / 100.f;
|
|
}
|
|
|
|
void mixer_init() {
|
|
for (int i = 0; i < 256; i++) {
|
|
bus[i].next = i+1;
|
|
bus[i].on = 0;
|
|
bus[i].id = i;
|
|
}
|
|
|
|
bus[255].next = -1;
|
|
|
|
initted = 1;
|
|
}
|
|
|
|
struct bus *first_free_bus(struct dsp_filter in) {
|
|
if (!initted) return;
|
|
assert(initted);
|
|
|
|
if (first == -1) return NULL;
|
|
int ret = first;
|
|
first = bus[ret].next;
|
|
|
|
bus[ret].on = 1;
|
|
bus[ret].in = in;
|
|
|
|
if (first_on != -1) bus[first_on].prev = ret;
|
|
|
|
bus[ret].next = first_on;
|
|
bus[ret].prev = -1;
|
|
first_on = ret;
|
|
|
|
return &bus[ret];
|
|
}
|
|
|
|
void bus_free(struct bus *b)
|
|
{
|
|
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;
|
|
}
|
|
|
|
void bus_fill_buffers(short *master, int n) {
|
|
int curbus = first_on;
|
|
if (curbus == -1) return;
|
|
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 */
|
|
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] * master_volume;
|
|
|
|
curbus = nextbus;
|
|
}
|
|
|
|
}
|