ref: f0f2d452c873255dec4b3359b3f93e349be0f2c5
dir: /sys/src/cmd/nusb/cam/cam.c/
#include <u.h>
#include <libc.h>
#include <ctype.h>
#include <fcall.h>
#include <thread.h>
#include <9p.h>
#include <bio.h>
#include "usb.h"
#include "uvc.h"
#include "dat.h"
#include "fns.h"
char user[] = "cam";
Cam *cams;
int nunit;
VCUnit **unit;
Iface **unitif;
int debug;
int
getframedesc(Cam *c, int i, int j, Format **fp, VSUncompressedFrame **gp)
{
Format *f;
if(i >= c->nformat) return -1;
f = c->format[i];
if(f == nil) return -1;
if(j >= f->nframe) return -1;
if(f->frame[j] == nil) return -1;
if(fp != nil) *fp = f;
if(gp != nil) *gp = f->frame[j];
return 0;
}
static void
parsevcdesc(Dev *dev, Desc *d)
{
VCDescriptor *vdp;
static Cam *cam;
static Format *format;
int i;
Format *f;
if(d == nil) return;
vdp = (VCDescriptor *) &d->data;
if(vdp->bDescriptorType != 0x24) return;
if(Class(d->iface->csp) != CC_VIDEO) return;
switch(Subclass(d->iface->csp)){
case SC_VIDEOSTREAMING:
switch(vdp->bDescriptorSubtype){
case VS_INPUT_HEADER:
format = nil;
cam = emallocz(sizeof(Cam), 1);
cam->dev = dev;
cam->iface = d->iface;
cam->hdr = (VSInputHeader *) vdp;
cam->next = cams;
cams = cam;
break;
case VS_FORMAT_UNCOMPRESSED:
if(cam == nil) return;
f = emallocz(sizeof(Format), 1);
f->desc = (void*)vdp;
i = f->desc->bFormatIndex;
if(i >= cam->nformat){
cam->format = realloc(cam->format, (i + 1) * sizeof(void *));
memset(cam->format + cam->nformat, 0, (i - cam->nformat) * sizeof(void *));
cam->nformat = i + 1;
}
cam->format[i] = f;
if(format == nil) cam->pc.bFormatIndex = i;
format = f;
break;
case VS_FRAME_UNCOMPRESSED:
if(cam == nil || cam->nformat == 0) return;
f = format;
i = ((VSUncompressedFrame*)vdp)->bFrameIndex;
if(i >= f->nframe){
f->frame = realloc(f->frame, (i + 1) * sizeof(void *));
memset(f->frame + f->nframe, 0, (i - f->nframe) * sizeof(void *));
f->nframe = i + 1;
}
f->frame[i] = (void*)vdp;
break;
}
break;
case SC_VIDEOCONTROL:
switch(vdp->bDescriptorSubtype){
case VC_INPUT_TERMINAL:
case VC_OUTPUT_TERMINAL:
case VC_SELECTOR_UNIT:
case VC_PROCESSING_UNIT:
case VC_ENCODING_UNIT:
case VC_EXTENSION_UNIT:
i = ((VCUnit*)vdp)->bUnitID;
if(i >= nunit){
unit = realloc(unit, (i + 1) * sizeof(void *));
unitif = realloc(unitif, (i + 1) * sizeof(Iface *));
memset(unit + nunit, 0, (i - nunit) * sizeof(void *));
memset(unitif + nunit, 0, (i - nunit) * sizeof(void *));
nunit = i + 1;
}
unit[i] = (void*)vdp;
unitif[i] = d->iface;
break;
}
break;
}
}
static void
createfiles(File *root, char *devname, Cam *c)
{
char buf[512];
File *d;
snprint(buf, sizeof(buf), "cam%s.%d", devname, c->iface->id);
d = createfile(root, buf, user, DMDIR|0555, c);
c->ctlfile = createfile(d, "ctl", user, 0666, c);
c->formatsfile = createfile(d, "formats", user, 0444, c);
c->videofile = createfile(d, "video", user, 0444, c);
c->framefile = createfile(d, "frame", user, 0444, c);
c->descfile = createfile(d, "desc", user, 0444, c);
}
static char *
formatread(Cam *c)
{
int i, j, k;
Fmt fmt;
Format *f;
VSUncompressedFrame *g;
char buf[5];
fmtstrinit(&fmt);
for(i = 0; i < c->nformat; i++){
f = c->format[i];
if(f == nil) continue;
memcpy(buf, f->desc->guidFormat, 4);
buf[4] = 0;
for(j = 0; j < f->nframe; j++){
if((g = f->frame[j]) == nil) continue;
fmtprint(&fmt, "%dx%dx%d-%s ", GET2(g->wWidth), GET2(g->wHeight), f->desc->bBitsPerPixel, buf);
if(g->bFrameIntervalType == 0)
fmtprint(&fmt, "%.2f-%.2f\n", 10e6 / (u32int)GET4(g->dwFrameInterval[0]), 10e6 / (u32int)GET4(g->dwFrameInterval[1]));
else
for(k = 0; k < g->bFrameIntervalType; k++)
fmtprint(&fmt, "%.2f%c", 10e6 / (u32int)GET4(g->dwFrameInterval[k]), k == g->bFrameIntervalType - 1 ? '\n' : ',');
}
}
return fmtstrflush(&fmt);
}
static char *
descread(Cam *c)
{
Fmt fmt;
int i;
Usbdev *ud;
Desc *d;
VCDescriptor *vdp;
ud = c->dev->usb;
fmtstrinit(&fmt);
for(i = 0; i < nelem(ud->ddesc); i++){
d = ud->ddesc[i];
if(d == nil) continue;
vdp = (VCDescriptor *) &d->data;
if(vdp->bDescriptorType != 0x24) continue;
if(Class(d->iface->csp) != CC_VIDEO) continue;
printDescriptor(&fmt, d->iface, vdp);
}
printProbeControl(&fmt, &c->pc);
return fmtstrflush(&fmt);
}
typedef struct ReadState ReadState;
struct ReadState {
int len;
char *buf;
};
static void
strread(Req *req, char *str, int len)
{
ReadState *rs;
if(req->fid->aux != nil){
free(((ReadState*)req->fid->aux)->buf);
free(req->fid->aux);
req->fid->aux = nil;
}
if(str == nil)
return;
rs = emallocz(sizeof(ReadState), 1);
rs->len = len < 0 ? strlen(str) : len;
rs->buf = str;
req->fid->aux = rs;
}
static void
fsread(Req *req)
{
File *f;
Cam *c;
ReadState *rs;
if(req->fid == nil || req->fid->file == nil || req->fid->file->aux == nil){
respond(req, "the front fell off");
return;
}
f = req->fid->file;
c = f->aux;
if(req->fid->aux == nil || req->ifcall.offset == 0)
if(f == c->formatsfile)
strread(req, formatread(c), -1);
else if(f == c->ctlfile)
strread(req, ctlread(c), -1);
else if(f == c->descfile)
strread(req, descread(c), -1);
else if(f == c->videofile || f == c->framefile){
videoread(req, c, 1);
return;
}
if((rs = req->fid->aux) == nil){
respond(req, "the front fell off");
return;
}
readbuf(req, rs->buf, rs->len);
respond(req, nil);
}
static void
fswrite(Req *req)
{
File *f;
Cam *c;
char *s;
int n;
if(req->fid == nil || req->fid->file == nil || req->fid->file->aux == nil){
err: respond(req, "the front fell off");
return;
}
f = req->fid->file;
c = f->aux;
if(f != c->ctlfile)
goto err;
for(n = 0; n < req->ifcall.count; n++)
if(req->ifcall.data[n] == '\n')
break;
s = emallocz(n+1, 0);
memcpy(s, req->ifcall.data, n);
s[n] = 0;
werrstr("invalid argument");
if(ctlwrite(c, s) < 0)
responderror(req);
else{
req->ofcall.count = req->ifcall.count;
respond(req, nil);
}
free(s);
}
static void
fsdestroyfid(Fid *fid)
{
ReadState *rs;
if(fid->omode == -1)
return;
rs = fid->aux;
if(rs != nil){
free(rs->buf);
free(rs);
}
if(fid->file != nil && fid->file->aux != nil && (fid->file == ((Cam*)fid->file->aux)->videofile || fid->file == ((Cam*)fid->file->aux)->framefile))
videoclose(fid->file->aux);
}
static void
fsopen(Req *req)
{
File *f;
Cam *c;
if((req->ofcall.qid.type & QTDIR) != 0){
respond(req, nil);
return;
}
if(req->fid == nil || req->fid->file == nil || req->fid->file->aux == nil){
respond(req, "the front fell off");
return;
}
f = req->fid->file;
c = f->aux;
if(f == c->videofile || f == c->framefile)
if(videoopen(c, f == c->framefile) < 0){
responderror(req);
return;
}
respond(req, nil);
}
static void
fsflush(Req *req)
{
if(req->oldreq->fid->file != nil && req->oldreq->fid->file->aux != nil && (((Cam*)req->oldreq->fid->file->aux)->videofile == req->oldreq->fid->file || ((Cam*)req->oldreq->fid->file->aux)->framefile == req->oldreq->fid->file))
videoflush(req->oldreq, req->oldreq->fid->file->aux);
respond(req, nil);
}
static void
usage(void)
{
fprint(2, "usage: %s [-d] devid\n", argv0);
threadexits("usage");
}
static Srv fs = {
.open = fsopen,
.read = fsread,
.write = fswrite,
.flush = fsflush,
.destroyfid = fsdestroyfid,
};
void
threadmain(int argc, char* argv[])
{
int i;
Dev *d;
Usbdev *ud;
char buf[512];
Cam *c;
ARGBEGIN{
case 'd':
debug++;
break;
default:
usage();
}ARGEND;
if(argc != 1)
usage();
d = getdev(*argv);
if(d == nil)
sysfatal("getdev: %r");
ud = d->usb;
for(i = 0; i < nelem(ud->ddesc); i++)
parsevcdesc(d, ud->ddesc[i]);
if(cams == nil)
sysfatal("no input streams");
for(c = cams; c != nil; c = c->next)
if(c->nformat > 0){
c->pc.bFrameIndex = c->format[c->pc.bFormatIndex]->desc->bDefaultFrameIndex;
if(c->pc.bFrameIndex < c->format[c->pc.bFormatIndex]->nframe && c->format[c->pc.bFormatIndex]->frame[c->pc.bFrameIndex] != nil)
PUT4(c->pc.dwFrameInterval, GET4(c->format[c->pc.bFormatIndex]->frame[c->pc.bFrameIndex]->dwDefaultFrameInterval));
}
fs.tree = alloctree(user, "usb", DMDIR|0555, nil);
for(c = cams; c != nil; c = c->next)
createfiles(fs.tree->root, d->hname, c);
snprint(buf, sizeof buf, "%d.cam", d->id);
threadpostsharesrv(&fs, nil, "usb", buf);
threadexits(nil);
}