shallow zip-file copy from codec2 e9d726bf20

1 files changed, 111 insertions, 0 deletions

diff --git a/unittest/t48_8.c b/unittest/t48_8.c
new file mode 100644
index 0000000..2e277a3
--- /dev/null
+++ b/unittest/t48_8.c
@@ -0,0 +1,111 @@
+/*
+   t48_8.c
+   David Rowe
+   May 10 2012
+
+   Unit test for 48 to 8 kHz sample rate conversion functions.  I
+   evaluated output by plotting using Octave and looking for jaggies:
+
+     pl("../unittest/out48.raw",1,3000)
+     pl("../unittest/out8.raw",1,3000)
+
+   Listening to it also shows up anything nasty:
+
+     $ play -s -2 -r 48000 out48.raw
+     $ play -s -2 -r 8000 out8.raw
+
+  */
+
+#include <assert.h>
+#include <math.h>
+#include <stdlib.h>
+#include <stdio.h>
+#include "codec2_fdmdv.h"
+
+#define N8         180        /* processing buffer size at 8 kHz */
+#define N48        (N8*FDMDV_OS_48)
+#define MEM8       FDMDV_OS_TAPS_48_8K
+#define FRAMES     50
+#define TWO_PI     6.283185307
+#define FS         48000
+
+#define SINE
+
+int main() {
+    float in8k[MEM8 + N8];
+    short in8k_short[N8];
+    float out48k[N48];
+    short out48k_short[N48];
+    FILE *f48;
+
+    float in48k[FDMDV_OS_TAPS_48K + N48];
+    float out8k[N48];
+    short out8k_short[N8];
+    FILE *f8, *f8in;
+
+    int i,f,t,t1;
+    float freq = 800.0;
+
+    f48 = fopen("out48.raw", "wb");
+    assert(f48 != NULL);
+    f8 = fopen("out8.raw", "wb");
+    assert(f8 != NULL);
+    f8in = fopen("in8.raw", "wb");
+    assert(f8in != NULL);
+
+    /* clear filter memories */
+
+    for(i=0; i<MEM8; i++)
+	in8k[i] = 0.0;
+    for(i=0; i<FDMDV_OS_TAPS_48K; i++)
+	in48k[i] = 0.0;
+
+    t = t1 = 0;
+    for(f=0; f<FRAMES; f++) {
+
+#ifdef DC
+	for(i=0; i<N8; i++)
+	    in8k[MEM8+i] = 16000.0;
+#endif
+#ifdef SINE
+	for(i=0; i<N8; i++,t++)
+	    in8k[MEM8+i] = 16000.0*cos(TWO_PI*t*freq/(FS/FDMDV_OS_48));
+#endif
+	for(i=0; i<N8; i++)
+	    in8k_short[i] = (short)in8k[i];
+	fwrite(in8k_short, sizeof(short), N8, f8in);
+
+	/* upsample  */
+
+	fdmdv_8_to_48(out48k, &in8k[MEM8], N8);
+
+	/* save 48k to disk for plotting and check out */
+
+	for(i=0; i<N48; i++)
+	    out48k_short[i] = (short)out48k[i];
+	fwrite(out48k_short, sizeof(short), N48, f48);
+
+	/* add a 10 kHz spurious signal for fun, we want down sampler to
+	   knock this out */
+
+	for(i=0; i<N48; i++,t1++)
+	    in48k[i+FDMDV_OS_TAPS_48K] = out48k[i] + 16000.0*cos(TWO_PI*t1*1E4/FS);
+
+	/* downsample */
+
+	fdmdv_48_to_8(out8k, &in48k[FDMDV_OS_TAPS_48K], N8);
+
+	/* save 8k to disk for plotting and check out */
+
+	for(i=0; i<N8; i++)
+	    out8k_short[i] = (short)out8k[i];
+	fwrite(out8k_short, sizeof(short), N8, f8);
+
+    }
+
+    fclose(f48);
+    fclose(f8);
+    fclose(f8in);
+    return 0;
+
+}