ref: 54d0561599f831b9babc4ca8d847139177fe8f7d
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 = 32,
};
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->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);
}
static int
auxreaddsp(Aux *a, float *b, int n)
{
State *s;
float *m, level;
int i, j, x;
s = a->state;
n = fs->dsp.read(s->voice[0], b, n);
for (i = 0; i < n && b[i] == 0.0f; i++);
s->silent = i != n;
/* 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;
}
for (i = 1; i < s->nvoice; i++) {
if ((x = fs->dsp.read(s->voice[i], m, n)) != n) /* well that's weird... why wouldn't it work? */
fprint(2, "voice %d returned %d samples instead of %d\n", i, x, n);
level = 0.0f;
for (x--; x >= 0; x--) { /* FIXME this could be faster */
level = MAX(level, m[x]);
b[x] = b[x]+m[x] - b[x]*m[x];
}
if (level <= 0.0f) { /* this one is silent, delete it */
fs->dsp.free(s->voice[i]);
s->voice[i] = 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 n;
}
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 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;
/* autovoice means every write needs to use (possibly) a new instance */
if (a->ui->autovoice && !s->silent && 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 */
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]));
}