making act segmenter

1 files changed, 81 insertions, 0 deletions

diff --git a/ffmpeg/tools/trasher.c b/ffmpeg/tools/trasher.c
new file mode 100644
index 0000000..aaa09f4
--- /dev/null
+++ b/ffmpeg/tools/trasher.c
@@ -0,0 +1,81 @@
+/*
+ * Copyright (c) 2007 Michael Niedermayer
+ *
+ * This file is part of FFmpeg.
+ *
+ * FFmpeg is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU Lesser General Public
+ * License as published by the Free Software Foundation; either
+ * version 2.1 of the License, or (at your option) any later version.
+ *
+ * FFmpeg is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+ * Lesser General Public License for more details.
+ *
+ * You should have received a copy of the GNU Lesser General Public
+ * License along with FFmpeg; if not, write to the Free Software
+ * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
+ */
+
+#include <stdio.h>
+#include <stdlib.h>
+#include <inttypes.h>
+#include <errno.h>
+#include <string.h>
+
+static uint32_t state;
+static uint32_t ran(void)
+{
+    return state = state * 1664525 + 1013904223;
+}
+
+int main(int argc, char **argv)
+{
+    FILE *f;
+    int count, maxburst, length;
+
+    if (argc < 5) {
+        printf("USAGE: trasher <filename> <count> <maxburst> <seed>\n");
+        return 1;
+    }
+
+    f = fopen(argv[1], "rb+");
+    if (!f) {
+        perror(argv[1]);
+        return 2;
+    }
+    count    = atoi(argv[2]);
+    maxburst = atoi(argv[3]);
+    state    = atoi(argv[4]);
+
+    fseek(f, 0, SEEK_END);
+    length = ftell(f);
+    fseek(f, 0, SEEK_SET);
+
+    while (count--) {
+        int burst = 1 + ran() * (uint64_t) (abs(maxburst) - 1) / UINT32_MAX;
+        int pos   = ran() * (uint64_t) length / UINT32_MAX;
+        if (fseek(f, pos, SEEK_SET) < 0) {
+            fprintf(stderr, "seek failed\n");
+            return 1;
+        }
+
+        if (maxburst < 0)
+            burst = -maxburst;
+
+        if (pos + burst > length)
+            continue;
+
+        while (burst--) {
+            int val = ran() * 256ULL / UINT32_MAX;
+
+            if (maxburst < 0)
+                val = 0;
+
+            fwrite(&val, 1, 1, f);
+        }
+    }
+
+    return 0;
+}