make bench smart; don't assume input/output ports

Makefile

@@ -30,6 +30,9 @@ all: options ${ALL}
 bench: all ${BENCH}
 	@echo LD ${BENCH} ${MID} -o $@
 	@${CC} ${ALL_CFLAGS} ${BENCH} -o $@ ${ALL_LDFLAGS} -rdynamic -ldl
+
+.PHONY: benchmark
+benchmark: bench
 	./benchtime ./bench ${AGAINST}
 
 .PHONY: options

README.md

@@ -21,7 +21,7 @@ white noise generator. loud, full-range, 0dBFS. don't say i didn't warn you.
 
 ## build notes
 
-`make` it. optional `bench` benchmarking target, doesn't build on Windows.
+`make` it. optional `benchmark` target which doesn't build on Windows.
 
 if you're using gcc, try `CFLAGS='-O3 -ffast-math'`.
 `-march=native` actually seems to degrade performance slightly, but YMMV.

bench.c

@@ -1,4 +1,5 @@
 #include <stdlib.h>
+#include <stdio.h>
 #include <assert.h>
 #include <time.h>
 
@@ -10,13 +11,14 @@ enum {
 	BLOCK_SIZE=2048
 };
 
-float inputs[BLOCK_SIZE];
-float outputs[BLOCK_SIZE];
 void *plug = NULL;
+static float *audio_buffer;
+static int audio_count = 0;
 
 static void
 cleanup() {
 	dlclose(plug);
+	if (audio_count) free(audio_buffer);
 }
 
 static const LADSPA_Descriptor*
@@ -43,12 +45,21 @@ main(int argc, char **argv) {
 	LADSPA_Handle h = d->instantiate(d, 44100);
 	assert(h);
 
-	d->connect_port(h, 0, inputs);
+	// we're lazy so we don't distinguish inputs and outputs
-	d->connect_port(h, 1, outputs);
+	for (int i = 0; i < d->PortCount; i++)
+		if (LADSPA_IS_PORT_AUDIO(d->PortDescriptors[i]))
+			audio_count++;
+
+	audio_buffer = calloc(audio_count*BLOCK_SIZE, sizeof(float));
+
+	int a = 0;
+	for (int i = 0; i < d->PortCount; i++)
+		if (LADSPA_IS_PORT_AUDIO(d->PortDescriptors[i]))
+			d->connect_port(h, i, audio_buffer + a++*BLOCK_SIZE);
 
 	mirand = time(NULL);
-	for (int i = 0; i < BLOCK_SIZE; i++)
+	for (int i = 0; i < audio_count*BLOCK_SIZE; i++)
-		inputs[i] = whitenoise();
+		audio_buffer[i] = whitenoise();
 
 	if (d->activate) d->activate(h);
 	for (int i = 0; i < 64*64*8; i++)

benchtime

@@ -2,6 +2,12 @@
 bench="$1"
 against="$2"
 
+cleanup() {
+    echo -e "\e[0;"
+    exit 0
+}
+trap cleanup INT
+
 TIMEFORMAT='%3R'
 for i in {1..8}; do
     time "$bench" "$against"