ref: 79305b636909d40a7275b5a6ac2b69d3abce12cb
dir: /fs.c/
#include <u.h>
#include <libc.h>
#include <fcall.h>
#include <thread.h>
#include <9p.h>
#include "common.h"
#include "ui.h"
#include "fs.h"
#define MAX(a,b) ((a)>=(b)?(a):(b))
#define MIN(a,b) ((a)<=(b)?(a):(b))
enum {
Maxobjs = 64,
Maxvoice = 16,
};
static Aux *objs[Maxobjs];
static Aux rootaux[] = {
[Xctl] = {.type = Xctl},
[Xmetadata] = {.type = Xmetadata},
[Xclone] = {.type = Xclone},
};
extern File *uif;
extern State *uis;
static Fs *fs;
static Aux *
newobj(char *name)
{
File *f;
Aux *o;
int i, mode;
for (i = 0, o = nil; o == nil && i < nelem(objs); i++) {
if (objs[i] == nil){
o = objs[i] = calloc(1, sizeof(*o));
break;
}
}
if (o == nil)
return nil;
o->id = i;
o->type = Xdsp;
o->ctl = Xdspctl;
o->data = Xdspdata;
sprint(name, "%d", o->id);
if ((f = createfile(fs->srv.tree->root, name, nil, DMDIR|0775, o)) == nil)
return nil;
closefile(createfile(f, "ctl", nil, 0664, &o->ctl));
mode = 0;
if (fs->dsp.read != nil)
mode |= 0444;
if (fs->dsp.write != nil)
mode |= 0222;
closefile(createfile(f, "data", nil, mode, &o->data));
uif = f;
o->state = uis = calloc(1, sizeof(State));
o->state->voice = calloc(1, sizeof(Auxdsp*));
o->state->voice[o->state->nvoice++] = fs->dsp.new(&o->numin, &o->numout);
o->state->silent = 1;
closefile(f);
return o;
}
static void
freeobj(Aux *o)
{
int i;
if (o == nil)
return;
if (o->type == Xdsp) {
objs[o->id] = nil;
for (i = 0; i < o->state->nvoice; i++)
fs->dsp.free(o->state->voice[i]);
free(o->state->voice);
free(o->state);
}
free(o);
}
static void *
auxtype2obj(int *type)
{
switch (*type) {
case Xdspctl:
case Xuictl:
return (uchar*)type - offsetof(Aux, ctl);
case Xdspdata:
return (uchar*)type - offsetof(Aux, data);
case Xuimeta:
return (uchar*)type - offsetof(Aux, metadata);
default:
sysfatal("trying to get aux out of type %d", *type);
}
return nil;
}
static void
fsopen(Req *r)
{
respond(r, nil);
}
#define CROSS(a,b) (a <= 0.0f && a < b)
static int
auxreaddsp(Aux *a, float *b, int n)
{
State *s;
float *m, level, least;
int i, j, cross, silent, total, quiet;
s = a->state;
cross = 0;
total = n;
if (!s->silent) {
silent = 1;
n = fs->dsp.read(s->voice[0], b, n);
total = n;
for (i = 0; i < n; i++) {
if (b[i] != 0.0f) {
silent = 0;
/* not silent, don't care for crossing? leave early */
if (!s->crossvoice)
break;
}
/* find the cross point */
if (s->crossvoice && i > 0 && cross < 1 && CROSS(b[i-1], b[i])) {
cross = i;
break;
}
}
s->silent = silent;
}
/* simple case: error, no data, or just one voice */
if (n < 1 || s->nvoice < 2)
return n;
/* otherwise need to mix all the voices together */
m = s->mixer;
if (s->mixersz < n) {
s->mixersz = n;
if ((m = realloc(m, n*sizeof(float))) == nil) {
fprint(2, "no memory for mixer, giving up\n");
return n;
}
s->mixer = m;
}
if (s->silent)
memset(b, 0, sizeof(*b)*n);
else if (s->crossvoice && cross < 1) /* no cross point? wait for it */
return total;
/* multiple voices and crossvoicing with a cross point known? shut up the main voice */
if (cross > 0){
s->silent = 1;
memset(b+cross, 0, sizeof(*b)*(n-cross));
/* start mixing into the crosspoint */
b += cross;
m += cross;
n -= cross;
}
quiet = -1;
least = 999.0;
for (i = 1; i < s->nvoice && n > 1; i++) {
if (s->crossvoice && i > 1 && cross < 1) /* no cross point? wait for it */
break;
n = fs->dsp.read(s->voice[i], m, n);
level = 0.0f;
cross = 0;
for (j = 0; j < n; j++) { /* FIXME this could be faster */
if (s->crossvoice && i+1 < s->nvoice && cross < 1 && j > 0) {
/* crossvoicing AND we have at least one more on top, see if we can shut *this* one up */
if (CROSS(m[j-1], m[j])) {
cross = j;
level = 0.0f; /* shut up forever */
b += j;
m += j;
n -= j;
break;
}
}
level = MAX(level, m[j]);
b[j] += m[j];
}
if (level <= 0.0f) { /* this one is silent, delete it */
fs->dsp.free(s->voice[i]);
s->voice[i] = nil;
/* freed one, don't try to free more */
least = -999.0f;
quiet = -1;
} else if (level < least) {
quiet = i;
least = level;
}
}
/* free up a voice if there are too many */
if (s->nvoice >= Maxvoice && quiet >= 0) {
fs->dsp.free(s->voice[quiet]);
s->voice[quiet] = nil;
}
/* relocate the voices */
for (i = j = 1; i < s->nvoice; i++) {
if (s->voice[i] != nil)
s->voice[j++] = s->voice[i];
}
s->nvoice = j;
return total;
}
static void
auxreset(Aux *a)
{
int i;
for (i = 0; i < a->state->nvoice; i++)
fs->dsp.reset(a->state->voice[i]);
}
static void
fsread(Req *r)
{
Aux *a, *o;
char b[256];
a = r->fid->file->aux;
switch (a->type) {
case Xctl:
respond(r, nil);
break;
case Xdspctl:
o = auxtype2obj(&a->type);
sprint(b, "numin\t%d\nnumout\t%d\n", o->numin, o->numout);
readstr(r, b);
respond(r, nil);
break;
case Xmetadata:
readstr(r, fs->metadata);
respond(r, nil);
break;
case Xclone:
if (r->ifcall.offset == 0) {
if (newobj(b) != nil) {
readstr(r, b);
} else {
snprint(b, sizeof(b), "no free objects: %r");
respond(r, b);
break;
}
}
respond(r, nil);
break;
case Xuictl:
case Xuimeta:
o = auxtype2obj(&a->type);
if (o->ui->readstr != nil)
readstr(r, o->ui->readstr(o->ui, a->type, b, sizeof(b)));
respond(r, nil);
break;
case Xdspdata:
o = auxtype2obj(&a->type);
r->ofcall.count = auxreaddsp(o, (float*)r->ofcall.data, r->ifcall.count/sizeof(float))*sizeof(float);
respond(r, nil);
break;
default:
respond(r, "not implemented");
break;
}
}
static int
auxwrite(Aux *a, int type, char *data)
{
State *s;
Auxdsp *clone;
void *so, *sc;
u8int *tmp;
int r, sz;
if (a->ui->writestr == nil) {
werrstr("not implemented");
return -1;
}
s = a->state;
s->crossvoice |= a->ui->crossvoice;
/* autovoice means every write needs to use (possibly) a new instance */
if (a->ui->autovoice && (!s->silent || s->nvoice > 1) && fs->dsp.clone != nil && fs->dsp.state != nil) {
/* now do the impossible */
so = fs->dsp.state(s->voice[0], &sz);
tmp = malloc(sz);
memmove(tmp, so, sz); /* save the original state */
/* write to the original and check if a new voice has to be created */
if ((r = a->ui->writestr(a->ui, type, data)) < 0 || *a->ui->zone == 0.0f) {
free(tmp);
return r;
}
clone = fs->dsp.clone(s->voice[0]); /* clone the original */
sc = fs->dsp.state(clone, &sz);
memmove(sc, so, sz); /* copy the changed state to the clone */
memmove(so, tmp, sz); /* revert the original state */
free(tmp);
/* now we have the original dsp intact, with a cloned dsp actually having the changed state */
s->voice = realloc(s->voice, (s->nvoice+1)*sizeof(*s->voice));
s->voice[s->nvoice++] = clone;
return r;
}
/* in any other case, just write to the original */
s->silent = 0;
return a->ui->writestr(a->ui, type, data);
}
static void
fswrite(Req *r)
{
Aux *a, *o;
char b[256];
if (r->ifcall.count >= sizeof(b)) {
respond(r, "can't fit into buffer");
return;
}
memmove(b, r->ifcall.data, r->ifcall.count);
b[r->ifcall.count] = '\0';
r->ofcall.count = r->ifcall.count;
a = r->fid->file->aux;
switch (a->type) {
case Xuictl:
o = auxtype2obj(&a->type);
if (auxwrite(o, a->type, b) >= 0)
respond(r, nil);
else
responderror(r);
break;
case Xdspctl: /* FIXME changing sampling rate */
o = auxtype2obj(&a->type);
if (strncmp(b, "reset", 5) == 0) /* FIXME ui needs to be reset as well */
auxreset(o);
respond(r, nil);
break;
case Xmetadata: /* FIXME should be possible to add new key/value */
default:
respond(r, "not implemented");
break;
}
}
static void
fsdestroyfile(File *f)
{
Aux *a;
if ((a = f->aux) == nil)
return;
switch (a->type) {
case Xdsp:
case Xui:
freeobj(a);
f->aux = nil;
break;
}
}
void
fsinit(void *fs_)
{
fs = fs_;
fs->srv.open = fsopen;
fs->srv.read = fsread;
fs->srv.write = fswrite;
fs->srv.tree = alloctree(nil, nil, DMDIR|0775, fsdestroyfile);
closefile(createfile(fs->srv.tree->root, "ctl", nil, 0666, &rootaux[Xctl]));
closefile(createfile(fs->srv.tree->root, "metadata", nil, 0444, &rootaux[Xmetadata]));
closefile(createfile(fs->srv.tree->root, "clone", nil, 0444, &rootaux[Xclone]));
}