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sync audio start to the first frame

--- a/main.c

+++ b/main.c

@@ -15,6 +15,7 @@

 static Image *curim;

 static uvlong lastframe;

 static int audiofd = -1;

+static Channel *audiosync;

 static Channel *audiofinished;

 static void

@@ -25,10 +26,15 @@

 	int audiofd;

 	if((audiofd = open("/dev/audio", OWRITE)) < 0){

-		fprint(2, "runaudio: %r");

+		fprint(2, "runaudio: %r\n");

+		recvp(audiosync);

+		chanclose(audiosync);

 	}else{

-		for(s = x; Sread(s, &f) == 0;)

+		for(s = x; Sread(s, &f) == 0;){

+			recvp(audiosync);

+			chanclose(audiosync);

 			write(audiofd, f.buf, f.sz);

+		}

 	}

 	sendp(audiofinished, nil);

@@ -79,6 +85,7 @@

 	draw(screen, r, curim, nil, ZP);

 	flushimage(display, 1);

 	unlockdisplay(display);

+	sendp(audiosync, nil);

 	delay = nanosec() - x;

 	lastframe += f->dt;

@@ -190,15 +197,17 @@

 		a[Cplayerdone].c = d->finished;

 		lastframe = 0;

+		if(saudio != nil){

+			audiosync = chancreate(sizeof(void*), 1);

+			audiofinished = chancreate(sizeof(void*), 0);

+			proccreate(audioproc, saudio, 4096);

+		}

+

 		for(done = 0; !done && !end;){

 			res = alt(a);

 			switch(res){

 			case Cframe:

 				drawframe(frame);

-				if(saudio != nil && audiofinished == nil){

-					audiofinished = chancreate(sizeof(void*), 0);

-					proccreate(audioproc, saudio, 4096);

-				}

 				break;

 			case Cplayerdone: