Tools used to process some raw audio data.

tools/noise-chopper.c

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+/*
+ * Copyright (c) 2018 Gregor Richards
+ *
+ * Permission to use, copy, modify, and/or distribute this software for any
+ * purpose with or without fee is hereby granted, provided that the above
+ * copyright notice and this permission notice appear in all copies.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
+ * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
+ * MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY
+ * SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
+ * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN ACTION
+ * OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF OR IN
+ * CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE. 
+ */
+
+#include <fcntl.h>
+#include <stdio.h>
+#include <stdlib.h>
+#include <sys/types.h>
+#include <unistd.h>
+
+#define TOTAL_SZ (10000000LL * 480)
+
+int main(int argc, char **argv)
+{
+    FILE *fh;
+    int i;
+    short *buf = NULL;
+    long perFileSz = TOTAL_SZ / (argc-1);
+    long fileSz;
+    size_t rd;
+
+    buf = malloc(perFileSz * sizeof(short));
+    if (!buf) {
+        perror("malloc");
+        return 1;
+    }
+
+    /* Loop over the input */
+    for (i = 1; i < argc; i++) {
+        /* Seek to the middle */
+        fh = fopen(argv[i], "rb");
+        fseek(fh, 0, SEEK_END);
+        fileSz = ftell(fh) / sizeof(short);
+        if (fileSz > perFileSz)
+            fseek(fh, (fileSz / 2 - perFileSz / 2) * sizeof(short), SEEK_SET);
+        else
+            fseek(fh, 0, SEEK_SET);
+
+        /* Read it in */
+        rd = fread(buf, sizeof(short), perFileSz, fh);
+        fclose(fh);
+
+        /* And write it out */
+        write(1, buf, rd * sizeof(short));
+    }
+
+    return 0;
+}