1 files changed, 138 insertions, 0 deletions
diff --git a/image/codecs/indeo/vlc.h b/image/codecs/indeo/vlc.h
new file mode 100644
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+++ b/image/codecs/indeo/vlc.h
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+/* ScummVM - Graphic Adventure Engine
+ *
+ * ScummVM is the legal property of its developers, whose names
+ * are too numerous to list here. Please refer to the COPYRIGHT
+ * file distributed with this source distribution.
+ *
+ * This program is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU General Public License
+ * as published by the Free Software Foundation; either version 2
+ * of the License, or (at your option) any later version.
+ *
+ * This program 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 General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program; if not, write to the Free Software
+ * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
+ *
+ */
+
+#include "common/scummsys.h"
+
+/* VLC code
+ *
+ * Original copyright note: * Intel Indeo 4 (IV41, IV42, etc.) video decoder for ffmpeg
+ * written, produced, and directed by Alan Smithee
+ */
+
+#ifndef IMAGE_CODECS_INDEO_VLC_H
+#define IMAGE_CODECS_INDEO_VLC_H
+
+#include "image/codecs/indeo/get_bits.h"
+
+namespace Image {
+namespace Indeo {
+
+#define VLC_TYPE int16
+#define INIT_VLC_LE             2
+#define INIT_VLC_USE_NEW_STATIC 4
+
+struct VLCcode {
+	uint8 bits;
+	uint16 symbol;
+	
+	/**
+	 * codeword, with the first bit-to-be-read in the msb
+	 * (even if intended for a little-endian bitstream reader)
+	 */
+	uint32 code;
+};
+
+struct VLC {
+private:
+	static int compare_vlcspec(const void *a, const void *b);
+public:
+    int bits;
+    VLC_TYPE (*table)[2];	///< code, bits
+    int table_size, table_allocated;
+
+	VLC();
+	~VLC() { ff_free_vlc(); }
+
+
+	/* Build VLC decoding tables suitable for use with get_vlc().
+
+	'nb_bits' sets the decoding table size (2^nb_bits) entries. The
+	bigger it is, the faster is the decoding. But it should not be too
+	big to save memory and L1 cache. '9' is a good compromise.
+
+	'nb_codes' : number of vlcs codes
+
+	'bits' : table which gives the size (in bits) of each vlc code.
+
+	'codes' : table which gives the bit pattern of of each vlc code.
+
+	'symbols' : table which gives the values to be returned from get_vlc().
+
+	'xxx_wrap' : give the number of bytes between each entry of the
+	'bits' or 'codes' tables.
+
+	'xxx_size' : gives the number of bytes of each entry of the 'bits'
+	or 'codes' tables.
+
+	'wrap' and 'size' make it possible to use any memory configuration and types
+	(byte/word/long) to store the 'bits', 'codes', and 'symbols' tables.
+
+	'use_static' should be set to 1 for tables, which should be freed
+	with av_free_static(), 0 if ff_free_vlc() will be used.
+	*/
+	int init_vlc(int nb_bits, int nb_codes, const void *bits, int bits_wrap,
+		int bits_size, const void *codes, int codes_wrap, int codes_size,
+		const void *symbols, int symbols_wrap, int symbols_size, int flags);
+
+	int init_vlc(int nb_bits, int nb_codes, const void *bits, int bits_wrap, int bits_size,
+		const void *codes, int codes_wrap, int codes_size, int flags);
+
+	/**
+	 * Free VLC data
+	 */
+	void ff_free_vlc();
+
+	
+	/**
+	 * Build VLC decoding tables suitable for use with get_vlc().
+	 *
+	 * @param table_nb_bits  max length of vlc codes to store directly in this table
+	 *                       (Longer codes are delegated to subtables.)
+	 *
+	 * @param nb_codes       number of elements in codes[]
+	 *
+	 * @param codes          descriptions of the vlc codes
+	 *                       These must be ordered such that codes going into the same subtable are contiguous.
+	 *                       Sorting by VLCcode.code is sufficient, though not necessary.
+	 */
+	int build_table(int table_nb_bits, int nb_codes,
+		VLCcode *codes, int flags);
+
+	int alloc_table(int size, int use_static);
+};
+
+
+/**
+ * Reverse "nbits" bits of the value "val" and return the result
+ * in the least significant bits.
+ */
+extern uint16 inv_bits(uint16 val, int nbits);
+
+/**
+ * Swap the order of the bytes in the passed value
+ */
+extern uint32 bitswap_32(uint32 x);
+
+} // End of namespace Indeo
+} // End of namespace Image
+
+#endif