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implement Mpeg;
include "sys.m";
sys: Sys;
FD: import Sys;
include "draw.m";
draw: Draw;
Display, Rect, Image: import draw;
include "dial.m";
dial: Dial;
Connection: import dial;
include "mpeg.m";
Chroma: con 16r05;
getenv()
{
if(sys != nil)
return;
sys = load Sys Sys->PATH;
draw = load Draw Draw->PATH;
dial = load Dial Dial->PATH;
}
copy(files: list of string, notify: chan of string, mpctl, mpdata: ref FD)
{
n: int;
c: ref Connection;
name: list of string;
while(files != nil) {
file := hd files;
(n, name) = sys->tokenize(file, "@");
m : ref FD;
case n {
1 =>
m = sys->open(file, sys->OREAD);
if(m == nil) {
notify <-= "mpeg open:" + file;
return;
}
2 =>
c = dial->dial(hd tl name, nil);
if(c == nil) {
notify <-= "dial:" + hd tl name;
return;
}
sys->fprint(c.dfd, "%s\n", hd name);
c.cfd = nil;
m = c.dfd;
* =>
notify <-= "bad file:"+hd name;
return;
}
sys->stream(m, mpdata, 64*1024);
files = tl files;
}
sys->fprint(mpctl, "stop");
sys->fprint(mpctl, "window 0 0 0 0");
notify <-= "";
}
play(display: ref Display, w: ref Image, paint: int, r: Rect, file: string, notify: chan of string): string
{
i, j: int;
line: string;
cfg: array of byte;
buf := array[1024] of byte;
arg, words, files: list of string;
getenv();
mpdata := sys->open("/dev/mpeg", sys->OWRITE);
if(mpdata == nil)
return sys->sprint("can't open /dev/mpeg: %r");
obj := sys->open(file, sys->OREAD);
if(obj == nil)
return "open failed:"+file;
n := sys->read(obj, buf, len buf);
if(n < 0)
return "mpeg object: read error";
mpctl := sys->open("/dev/mpegctl", sys->OWRITE);
if(mpctl == nil)
return "open mpeg ctl file";
# Parse into lines
(n, arg) = sys->tokenize(string buf[0:n], "\n");
for(i = 0; i < n; i++) {
# Parse into words
line = hd arg;
(j, words) = sys->tokenize(line, " \t");
# Pass device config lines through to the ctl file
if(hd words == "files")
files = tl words;
else {
cfg = array of byte line;
if(sys->write(mpctl, cfg, len cfg) < 0)
return "invalid device config:"+line;
}
arg = tl arg;
}
if(files == nil)
return "no file to play";
# now the driver is configured initialize the dsp's
# and set up the trident overlay
sys->fprint(mpctl, "init");
sys->fprint(mpctl, "window %d %d %d %d",
r.min.x, r.min.y, r.max.x, r.max.y);
# paint the window with the chroma key color
if(paint)
w.draw(r, keycolor(display), nil, r.min);
if(notify != nil) {
spawn copy(files, notify, mpctl, mpdata);
return "";
}
notify = chan of string;
spawn copy(files, notify, mpctl, mpdata);
return <-notify;
}
ctl(msg: string): int
{
mpc: ref FD;
getenv();
mpc = sys->open("/dev/mpegctl", sys->OWRITE);
if(mpc == nil)
return -1;
b := array of byte msg;
n := sys->write(mpc, b, len b);
if(n != len b)
n = -1;
return n;
}
keycolor(display: ref Display): ref Image
{
getenv();
return display.color(Chroma);
}
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