libavcodec/huffman.c File Reference

huffman tree builder and VLC generator Copyright (c) 2006 Konstantin Shishkov More...

#include "avcodec.h"
#include "get_bits.h"
#include "huffman.h"

Go to the source code of this file.

Defines
#define	HNODE   -1
Functions
static void	get_tree_codes (uint32_t *bits, int16_t *lens, uint8_t *xlat, Node *nodes, int node, uint32_t pfx, int pl, int *pos, int no_zero_count)
static int	build_huff_tree (VLC *vlc, Node *nodes, int head, int flags)
int	ff_huff_build_tree (AVCodecContext *avctx, VLC *vlc, int nb_codes, Node *nodes, HuffCmp cmp, int flags)
	nodes size must be 2*nb_codes first nb_codes nodes.count must be set

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Detailed Description

huffman tree builder and VLC generator Copyright (c) 2006 Konstantin Shishkov

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

Definition in file huffman.c.

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Define Documentation

#define HNODE   -1

Definition at line 28 of file huffman.c.

Referenced by ff_huff_build_tree(), and get_tree_codes().

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Function Documentation

static int build_huff_tree	(	VLC *	vlc,
		Node *	nodes,
		int	head,
		int	flags
	)			[static]

Definition at line 52 of file huffman.c.

Referenced by ff_huff_build_tree().

int ff_huff_build_tree	(	AVCodecContext *	avctx,
		VLC *	vlc,
		int	nb_codes,
		Node *	nodes,
		HuffCmp	cmp,
		int	flags
	)

nodes size must be 2*nb_codes first nb_codes nodes.count must be set

Definition at line 69 of file huffman.c.

Referenced by fraps2_decode_plane(), and vp6_build_huff_tree().

static void get_tree_codes	(	uint32_t *	bits,
		int16_t *	lens,
		uint8_t *	xlat,
		Node *	nodes,
		int	node,
		uint32_t	pfx,
		int	pl,
		int *	pos,
		int	no_zero_count
	)			[static]

Definition at line 31 of file huffman.c.

Referenced by build_huff_tree().