libavcodec/huffman.c File Reference

huffman tree builder and VLC generator More...

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

Go to the source code of this file.

Data Structures
struct	HeapElem
Defines
#define	HNODE   -1
Functions
static void	heap_sift (HeapElem *h, int root, int size)
void	ff_huff_gen_len_table (uint8_t *dst, const uint64_t *stats)
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

Definition in file huffman.c.

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Define Documentation

#define HNODE   -1

Definition at line 32 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 115 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 133 of file huffman.c.

Referenced by fraps2_decode_plane(), and vp6_build_huff_tree().

void ff_huff_gen_len_table	(	uint8_t *	dst,
		const uint64_t *	stats
	)

Definition at line 53 of file huffman.c.

Referenced by encode_plane().

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 92 of file huffman.c.

Referenced by build_huff_tree().

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

Definition at line 39 of file huffman.c.

Referenced by ff_huff_gen_len_table().