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Sread: workaround for timestamps going backwards

--- a/stream.c

+++ b/stream.c

@@ -67,7 +67,16 @@

 	if((res = s->ops.read(s, f)) == 0){

 		if(s->t₀ == Zt₀)

 			s->t₀ = f->timestamp;

-		f->timestamp -= s->t₀;

+		/*

+		 * timestamps going backwards means clock wasn't monotonically

+		 * increasing. perhaps nanosec() or nsec() is to blame.

+		 * just work around it in any case, instead of hanging without

+		 * displaying any frames.

+		 */

+		if(f->timestamp > s->t₀)

+			f->timestamp -= s->t₀;

+		else

+			f->timestamp = 0;

 	}

 	return res;