[FFmpeg-soc] [soc]: r499 - dirac/golomb_lookup.c

[marco]

Author: marco
Date: Sat Jul 21 14:30:30 2007
New Revision: 499

Log:
A small program that was used to generate ff_interleaved_dirac_golomb_vlc_len and ff_interleaved_dirac_golomb_vlc_code.


Added:
   dirac/golomb_lookup.c

Added: dirac/golomb_lookup.c
==============================================================================
--- (empty file)
+++ dirac/golomb_lookup.c	Sat Jul 21 14:30:30 2007
@@ -0,0 +1,94 @@
+/* -*-  indent-tabs-mode:nil; c-basic-offset:4;  -*- */
+/*
+ * Copyright (C) 2007 Marco Gerards <marco at gnu.org>
+ *
+ * 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>
+
+static int byte = 0;
+static int cnt = 0;
+
+static int getbit(void)
+{
+    int ret = (byte & 128)? 1:0;
+    byte <<= 1;
+    cnt--;
+    if (cnt < 0)
+        ret = 1;
+
+    return ret;
+}
+
+static int dirac_golomb_val(i) {
+    unsigned int val = 0;
+
+    byte = i;
+    cnt = 8;
+
+    while (! getbit()) {
+        if (getbit())
+            val++;
+        val <<= 1;
+    }
+    val >>= 1;
+
+    printf("%d, ", val);
+    return val;
+}
+
+static int dirac_golomb_bits(i) {
+    unsigned int val = 0;
+    int pos = 0;
+
+    byte = i;
+    cnt = 8;
+
+    while (! getbit()) {
+        if (getbit())
+            val++;
+        val <<= 1;
+        pos += 2;
+    }
+    val >>= 1;
+    pos++;
+
+    printf("%d,", pos);
+    return val;
+}
+
+
+int main (void) {
+    unsigned int i;
+
+    for (i = 0; i <= 255; i++) {
+        dirac_golomb_val(i);
+        if (i % 16 == 15)
+            printf("\n");
+    }
+
+    printf ("\n\n\n");
+
+    for (i = 0; i <= 255; i++) {
+        dirac_golomb_bits(i);
+        if (i % 16 == 15)
+            printf("\n");
+    }
+
+    return 0;
+}