From c787cb339ed7b49a303b7d8b7a5197b38e89c7c3 Mon Sep 17 00:00:00 2001
From: Reimar Döffinger <Reimar.Doeffinger@gmx.de>
Date: Sun, 21 Mar 2010 16:03:45 +0000
Subject: Add support for hard-coding the 256kB large dv_vlc_map table.

Originally committed as revision 22622 to svn://svn.ffmpeg.org/ffmpeg/trunk
---
 libavcodec/dv_tablegen.h | 96 ++++++++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 96 insertions(+)
 create mode 100644 libavcodec/dv_tablegen.h

(limited to 'libavcodec/dv_tablegen.h')

diff --git a/libavcodec/dv_tablegen.h b/libavcodec/dv_tablegen.h
new file mode 100644
index 0000000000..ee6e8220af
--- /dev/null
+++ b/libavcodec/dv_tablegen.h
@@ -0,0 +1,96 @@
+/*
+ * Header file for hardcoded DV tables
+ *
+ * Copyright (c) 2010 Reimar Döffinger <Reimar.Doeffinger@gmx.de>
+ *
+ * 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
+ */
+
+#ifndef DV_TABLEGEN_H
+#define DV_TABLEGEN_H
+
+#include <stdint.h>
+#include "dv_vlc_data.h"
+
+#if CONFIG_SMALL
+#define DV_VLC_MAP_RUN_SIZE 15
+#define DV_VLC_MAP_LEV_SIZE 23
+#else
+#define DV_VLC_MAP_RUN_SIZE  64
+#define DV_VLC_MAP_LEV_SIZE 512 //FIXME sign was removed so this should be /2 but needs check
+#endif
+
+/* VLC encoding lookup table */
+struct dv_vlc_pair {
+   uint32_t vlc;
+   uint32_t size;
+};
+
+#if CONFIG_HARDCODED_TABLES
+#define dv_vlc_map_tableinit()
+#include "libavcodec/dv_tables.h"
+#else
+static struct dv_vlc_pair dv_vlc_map[DV_VLC_MAP_RUN_SIZE][DV_VLC_MAP_LEV_SIZE];
+
+static void dv_vlc_map_tableinit(void)
+{
+    int i, j;
+    for (i = 0; i < NB_DV_VLC - 1; i++) {
+       if (dv_vlc_run[i] >= DV_VLC_MAP_RUN_SIZE)
+           continue;
+#if CONFIG_SMALL
+       if (dv_vlc_level[i] >= DV_VLC_MAP_LEV_SIZE)
+           continue;
+#endif
+
+       if (dv_vlc_map[dv_vlc_run[i]][dv_vlc_level[i]].size != 0)
+           continue;
+
+       dv_vlc_map[dv_vlc_run[i]][dv_vlc_level[i]].vlc  =
+           dv_vlc_bits[i] << (!!dv_vlc_level[i]);
+       dv_vlc_map[dv_vlc_run[i]][dv_vlc_level[i]].size =
+           dv_vlc_len[i] + (!!dv_vlc_level[i]);
+    }
+    for (i = 0; i < DV_VLC_MAP_RUN_SIZE; i++) {
+#if CONFIG_SMALL
+       for (j = 1; j < DV_VLC_MAP_LEV_SIZE; j++) {
+          if (dv_vlc_map[i][j].size == 0) {
+              dv_vlc_map[i][j].vlc = dv_vlc_map[0][j].vlc |
+                        (dv_vlc_map[i-1][0].vlc << (dv_vlc_map[0][j].size));
+              dv_vlc_map[i][j].size = dv_vlc_map[i-1][0].size +
+                                      dv_vlc_map[0][j].size;
+          }
+       }
+#else
+       for (j = 1; j < DV_VLC_MAP_LEV_SIZE/2; j++) {
+          if (dv_vlc_map[i][j].size == 0) {
+              dv_vlc_map[i][j].vlc = dv_vlc_map[0][j].vlc |
+                        (dv_vlc_map[i-1][0].vlc << (dv_vlc_map[0][j].size));
+              dv_vlc_map[i][j].size = dv_vlc_map[i-1][0].size +
+                                      dv_vlc_map[0][j].size;
+          }
+          dv_vlc_map[i][((uint16_t)(-j))&0x1ff].vlc =
+                                        dv_vlc_map[i][j].vlc | 1;
+          dv_vlc_map[i][((uint16_t)(-j))&0x1ff].size =
+                                        dv_vlc_map[i][j].size;
+       }
+#endif
+    }
+}
+#endif /* CONFIG_HARDCODED_TABLES */
+
+#endif /* DV_TABLEGEN_H */
-- 
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