iirfilter: add fate test

Change the test program to output text instead of binary files so
it can be compared easily in FATE.
Signed-off-by: Mans Rullgard <mans@mansr.com>

libavcodec/iirfilter.c

@@ -311,6 +311,9 @@ av_cold void ff_iir_filter_free_coeffs(struct FFIIRFilterCoeffs *coeffs)
 }
 
 #ifdef TEST
+#undef printf
+#include <stdio.h>
+
 #define FILT_ORDER 4
 #define SIZE 1024
 int main(void)
@@ -320,7 +323,6 @@ int main(void)
     float cutoff_coeff = 0.4;
     int16_t x[SIZE], y[SIZE];
     int i;
-    FILE* fd;
 
     fcoeffs = ff_iir_filter_init_coeffs(NULL, FF_FILTER_TYPE_BUTTERWORTH,
                                         FF_FILTER_MODE_LOWPASS, FILT_ORDER,
@@ -333,13 +335,8 @@ int main(void)
 
     ff_iir_filter(fcoeffs, fstate, SIZE, x, 1, y, 1);
 
-    fd = fopen("in.bin", "w");
-    fwrite(x, sizeof(x[0]), SIZE, fd);
-    fclose(fd);
-
-    fd = fopen("out.bin", "w");
-    fwrite(y, sizeof(y[0]), SIZE, fd);
-    fclose(fd);
+    for (i = 0; i < SIZE; i++)
+        printf("%6d %6d\n", x[i], y[i]);
 
     ff_iir_filter_free_coeffs(fcoeffs);
     ff_iir_filter_free_state(fstate);

tests/fate2.mak

@@ -218,3 +218,7 @@ fate-musepack7: CMD = pcm -i $(SAMPLES)/musepack/inside-mp7.mpc
 fate-musepack7: CMP = oneoff
 fate-musepack7: REF = $(SAMPLES)/musepack/inside-mp7.pcm
 fate-musepack7: FUZZ = 1
+
+FATE_TESTS += fate-iirfilter
+fate-iirfilter: libavcodec/iirfilter-test$(EXESUF)
+fate-iirfilter: CMD = run libavcodec/iirfilter-test