shallow zip-file copy from codec2 e9d726bf20

1 files changed, 47 insertions, 0 deletions

diff --git a/misc/16_8_short.c b/misc/16_8_short.c
new file mode 100644
index 0000000..a23722c
--- /dev/null
+++ b/misc/16_8_short.c
@@ -0,0 +1,47 @@
+/*
+   16_8_short.c
+   David Rowe
+   October 2018
+
+   Utility for resampling raw files from 16 to 8 kHz.
+*/
+
+#include <assert.h>
+#include <math.h>
+#include <stdlib.h>
+#include <stdio.h>
+#include "codec2_fdmdv.h"
+
+#define N8                        160 /* procssing buffer size at 8 kHz */
+#define N16             (N8*FDMDV_OS)
+
+int main(int argc, char *argv[]) {
+    short in16k_short[FDMDV_OS_TAPS_16K + N16];
+    FILE *f16;
+    short out8k_short[N16];
+    FILE *f8;
+    int i;
+
+    if (argc != 3) {
+        fprintf(stderr, "usage: %s 16kHz.raw 8kHz.raw\n", argv[0]);
+        exit(1);
+    }
+    f16 = fopen(argv[1], "rb");
+    assert(f16 != NULL);
+    f8 = fopen(argv[2], "wb");
+    assert(f8 != NULL);
+
+    /* clear filter memories */
+
+    for(i=0; i<FDMDV_OS_TAPS_16K; i++)
+	in16k_short[i] = 0;
+
+    while(fread(&in16k_short[FDMDV_OS_TAPS_16K], sizeof(short), N16, f16) == N16) {
+	fdmdv_16_to_8_short(out8k_short, &in16k_short[FDMDV_OS_TAPS_16K], N8);
+	fwrite(out8k_short, sizeof(short), N8, f8);
+    }
+
+    fclose(f16);
+    fclose(f8);
+    return 0;
+}