Tools used to process some raw audio data.

tools/chopper.c

@@ -0,0 +1,82 @@
+/*
+ * 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 CHOP_SZ 384000
+
+int main(int argc, char **argv)
+{
+    int *fds;
+    int i;
+    ssize_t rd, total;
+    short buf[CHOP_SZ];
+
+    fds = malloc((argc-1)*sizeof(int));
+    if (fds == NULL) {
+        perror("malloc");
+        exit(1);
+    }
+
+    /* Open each file */
+    for (i = 1; i < argc; i++) {
+        int fd = open(argv[i], O_RDONLY);
+        if (fd < 0) {
+            perror(argv[i]);
+            exit(1);
+        }
+        fds[i-1] = fd;
+    }
+
+    /* Loop over the input */
+    while (1) {
+        char haveInput = 0;
+
+        /* Loop over each file */
+        for (i = 0; i < argc - 1; i++) {
+            int fd = fds[i];
+            if (fd < 0) continue;
+            haveInput = 1;
+
+            /* Take an appropriate chunk */
+            total = 0;
+            while (total < sizeof(buf)) {
+                rd = read(fd, ((char *) buf) + total, sizeof(buf) - total);
+                if (rd <= 0) {
+                    close(fd);
+                    fds[i] = -1;
+                    break;
+                }
+                total += rd;
+            }
+            if (total == 0 || (total%sizeof(short)) != 0)
+                continue;
+
+            /* Write it out */
+            write(1, buf, total);
+        }
+
+        /* Stop if they were all ended */
+        if (!haveInput)
+            break;
+    }
+
+    return 0;
+}