qdm2: Allow hard-coding VLC tables.

Also adds a lot of infrastructure necessary for it.
Some of it is a bit ugly though.
Increases binary size for hardcoded tables by about 12 kB,
which is about 15 kB from qdm2_table minus data and code
saved that was only used for creating it.

Signed-off-by: Reimar Döffinger <Reimar.Doeffinger@gmx.de>

1 files changed, 80 insertions, 0 deletions

diff --git a/libavcodec/tableprint_vlc.h b/libavcodec/tableprint_vlc.h
new file mode 100644
index 0000000000..aa4c82bbbf
--- /dev/null
+++ b/libavcodec/tableprint_vlc.h
@@ -0,0 +1,80 @@
+/*
+ * Helpers for generating hard-coded VLC tables
+ *
+ * Copyright (c) 2014 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 AVCODEC_TABLEPRINT_VLC_H
+#define AVCODEC_TABLEPRINT_VLC_H
+
+#define FFMPEG_CONFIG_H
+#define AVUTIL_LOG_H
+#define av_log(a, ...)
+#define av_dlog(a, ...)
+#define AVUTIL_MEM_H
+#define av_malloc(s) NULL
+#define av_malloc_array(a, b) NULL
+#define av_realloc_f(p, o, n) NULL
+#define av_free(p)
+#define av_freep(p)
+#define AVCODEC_AVCODEC_H
+#include "tableprint.h"
+#include "get_bits.h"
+#include "mathtables.c"
+#include "bitstream.c"
+
+#define REPLACE_DEFINE2(type) write_##type##_array
+#define REPLACE_DEFINE(type) REPLACE_DEFINE2(type)
+static void write_VLC_TYPE_array(const VLC_TYPE *p, int s) {
+    REPLACE_DEFINE(VLC_TYPE)(p, s);
+}
+
+WRITE_2D_FUNC(VLC_TYPE)
+
+static void write_vlc_type(const VLC *vlc, VLC_TYPE (*base_table)[2], const char *base_table_name)
+{
+    printf("    .bits = %i,\n", vlc->bits);
+    // Unfortunately need to cast away const currently
+    printf("    .table = (VLC_TYPE (*)[2])(%s + 0x%x),\n", base_table_name, (int)(vlc->table - base_table));
+    printf("    .table_size = 0x%x,\n", vlc->table_size);
+    printf("    .table_allocated = 0x%x,\n", vlc->table_allocated);
+}
+
+#define WRITE_VLC_TYPE(prefix, name, base_table)        \
+    do {                                                \
+        printf(prefix" VLC "#name" = {\n");             \
+        write_vlc_type(&name, base_table, #base_table); \
+        printf("};\n");                                 \
+    } while(0)
+
+#define WRITE_VLC_ARRAY(prefix, name, base_table)       \
+    do {                                                \
+        int i;                                          \
+        const size_t array_size = FF_ARRAY_ELEMS(name); \
+        printf(prefix" VLC "#name"[%"FMT"] = {{\n",     \
+               array_size);                             \
+        for (i = 0; i < array_size; i++) {              \
+            write_vlc_type(name + i,                    \
+                           base_table, #base_table);    \
+            if (i != array_size - 1) printf("}, {\n");  \
+        }                                               \
+        printf("}};\n");                                \
+    } while(0)
+
+#endif /* AVCODEC_TABLEPRINT_VLC_H */