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add benchmark mode (plays as fast as possible, audio disabled)

--- a/main.c

+++ b/main.c

@@ -24,6 +24,7 @@

 static int framedrop;

 static uvlong late;

 static int bw;

+static int benchmark;

 static void

 audioproc(void *x)

@@ -102,6 +103,7 @@

 	dispdelay = nanosec() - x;

+	if(!benchmark)

 	while(1){

 		x = nanosec();

 		if(x >= end - 1*1000ULL*1000ULL)

@@ -184,6 +186,9 @@

 		}

 		audio = EARGF(usage());

 		break;

+	case 'B':

+		benchmark++;

+		break;

 	case 'b':

 		bw++;

 		break;

@@ -230,7 +235,7 @@

 		for(j = 0; j < nstreams; j++){

 			if(stream[j].type == Svideo && svideo == nil)

 				svideo = stream+j;

-			else if(stream[j].type == Saudio && saudio == nil)

+			else if(stream[j].type == Saudio && saudio == nil && !benchmark)

 				saudio = stream+j;

 			else

 				Sclose(stream+j);