huffman.c File Reference

huffman tree builder and VLC generator More...

#include <stdint.h>
#include "libavutil/qsort.h"
#include "libavutil/common.h"
#include "avcodec.h"
#include "huffman.h"
#include "vlc.h"

Go to the source code of this file.

Data Structures
struct	HeapElem

Macros
#define	HNODE   -1

Functions
static void	heap_sift (HeapElem *h, int root, int size)
int	ff_huff_gen_len_table (uint8_t *dst, const uint64_t *stats, int stats_size, int skip0)
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 nb_bits)
int	ff_huff_build_tree (AVCodecContext *avctx, VLC *vlc, int nb_codes, int nb_bits, Node *nodes, HuffCmp cmp, int flags)
	nodes size must be 2*nb_codes first nb_codes nodes.count must be set More...

Detailed Description

huffman tree builder and VLC generator

Definition in file huffman.c.

Macro Definition Documentation

HNODE

#define HNODE   -1

Definition at line 37 of file huffman.c.

Referenced by ff_huff_build_tree(), and get_tree_codes().

Function Documentation

heap_sift()

static void heap_sift ( HeapElem *  h, int  root, int  size  )

static

Definition at line 44 of file huffman.c.

Referenced by ff_huff_gen_len_table().

ff_huff_gen_len_table()

int ff_huff_gen_len_table	(	uint8_t *	dst,
		const uint64_t *	stats,
		int	stats_size,
		int	skip0
	)

Definition at line 58 of file huffman.c.

Referenced by encode_plane(), and store_huffman_tables().

get_tree_codes()

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 116 of file huffman.c.

Referenced by build_huff_tree().

build_huff_tree()

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

static

Definition at line 139 of file huffman.c.

Referenced by ff_huff_build_tree().

ff_huff_build_tree()

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

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

Definition at line 157 of file huffman.c.

Referenced by fraps2_decode_plane(), and vp6_build_huff_tree().