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Macros | Functions | Variables
faxcompr.c File Reference

CCITT Fax Group 3 and 4 decompression. More...

#include "avcodec.h"
#include "get_bits.h"
#include "put_bits.h"
#include "faxcompr.h"

Go to the source code of this file.

Macros

#define CCITT_SYMS   104
 

Functions

av_cold void ff_ccitt_unpack_init (void)
 initialize unpacker code More...
 
static int decode_uncompressed (AVCodecContext *avctx, GetBitContext *gb, unsigned int *pix_left, int **runs, const int *runend, int *mode)
 
static int decode_group3_1d_line (AVCodecContext *avctx, GetBitContext *gb, unsigned int pix_left, int *runs, const int *runend)
 
static int decode_group3_2d_line (AVCodecContext *avctx, GetBitContext *gb, unsigned int width, int *runs, const int *runend, const int *ref)
 
static void put_line (uint8_t *dst, int size, int width, const int *runs)
 
static int find_group3_syncmarker (GetBitContext *gb, int srcsize)
 
int ff_ccitt_unpack (AVCodecContext *avctx, const uint8_t *src, int srcsize, uint8_t *dst, int height, int stride, enum TiffCompr compr, int opts)
 unpack data compressed with CCITT Group 3 1/2-D or Group 4 method More...
 

Variables

static const uint16_t ccitt_syms [CCITT_SYMS]
 
static const uint8_t ccitt_codes_bits [2][CCITT_SYMS]
 
static const uint8_t ccitt_codes_lens [2][CCITT_SYMS]
 
static const uint8_t ccitt_group3_2d_bits [11]
 
static const uint8_t ccitt_group3_2d_lens [11]
 
static VLC ccitt_vlc [2]
 
static VLC ccitt_group3_2d_vlc
 

Detailed Description

CCITT Fax Group 3 and 4 decompression.

Author
Konstantin Shishkov

Definition in file faxcompr.c.

Macro Definition Documentation

#define CCITT_SYMS   104

Definition at line 32 of file faxcompr.c.

Referenced by ff_ccitt_unpack_init().

Function Documentation

av_cold void ff_ccitt_unpack_init ( void  )

initialize unpacker code

Definition at line 99 of file faxcompr.c.

Referenced by tiff_init().

static int decode_uncompressed ( AVCodecContext avctx,
GetBitContext gb,
unsigned int pix_left,
int **  runs,
const int runend,
int mode 
)
static

Definition at line 125 of file faxcompr.c.

Referenced by decode_group3_1d_line(), and decode_group3_2d_line().

static int decode_group3_1d_line ( AVCodecContext avctx,
GetBitContext gb,
unsigned int  pix_left,
int runs,
const int runend 
)
static

Definition at line 201 of file faxcompr.c.

Referenced by ff_ccitt_unpack().

static int decode_group3_2d_line ( AVCodecContext avctx,
GetBitContext gb,
unsigned int  width,
int runs,
const int runend,
const int ref 
)
static

Definition at line 245 of file faxcompr.c.

Referenced by ff_ccitt_unpack().

static void put_line ( uint8_t dst,
int  size,
int  width,
const int runs 
)
static

Definition at line 351 of file faxcompr.c.

Referenced by ff_ccitt_unpack().

static int find_group3_syncmarker ( GetBitContext gb,
int  srcsize 
)
static

Definition at line 369 of file faxcompr.c.

Referenced by ff_ccitt_unpack().

int ff_ccitt_unpack ( AVCodecContext avctx,
const uint8_t src,
int  srcsize,
uint8_t dst,
int  height,
int  stride,
enum TiffCompr  compr,
int  opts 
)

unpack data compressed with CCITT Group 3 1/2-D or Group 4 method

Definition at line 381 of file faxcompr.c.

Referenced by tiff_unpack_fax().

Variable Documentation

const uint16_t ccitt_syms[CCITT_SYMS]
static
Initial value:
= {
0, 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12,
13, 14, 15, 16, 17, 18, 19, 20, 21, 22, 23, 24, 25,
26, 27, 28, 29, 30, 31, 32, 33, 34, 35, 36, 37, 38,
39, 40, 41, 42, 43, 44, 45, 46, 47, 48, 49, 50, 51,
52, 53, 54, 55, 56, 57, 58, 59, 60, 61, 62, 63, 64,
128, 192, 256, 320, 384, 448, 512, 576, 640, 704, 768, 832, 896,
960, 1024, 1088, 1152, 1216, 1280, 1344, 1408, 1472, 1536, 1600, 1664, 1728,
1792, 1856, 1920, 1984, 2048, 2112, 2176, 2240, 2304, 2368, 2432, 2496, 2560
}

Definition at line 34 of file faxcompr.c.

Referenced by ff_ccitt_unpack_init().

const uint8_t ccitt_codes_bits[2][CCITT_SYMS]
static
Initial value:
=
{
{
0x35, 0x07, 0x07, 0x08, 0x0B, 0x0C, 0x0E, 0x0F, 0x13, 0x14, 0x07, 0x08, 0x08,
0x03, 0x34, 0x35, 0x2A, 0x2B, 0x27, 0x0C, 0x08, 0x17, 0x03, 0x04, 0x28, 0x2B,
0x13, 0x24, 0x18, 0x02, 0x03, 0x1A, 0x1B, 0x12, 0x13, 0x14, 0x15, 0x16, 0x17,
0x28, 0x29, 0x2A, 0x2B, 0x2C, 0x2D, 0x04, 0x05, 0x0A, 0x0B, 0x52, 0x53, 0x54,
0x55, 0x24, 0x25, 0x58, 0x59, 0x5A, 0x5B, 0x4A, 0x4B, 0x32, 0x33, 0x34, 0x1B,
0x12, 0x17, 0x37, 0x36, 0x37, 0x64, 0x65, 0x68, 0x67, 0xCC, 0xCD, 0xD2, 0xD3,
0xD4, 0xD5, 0xD6, 0xD7, 0xD8, 0xD9, 0xDA, 0xDB, 0x98, 0x99, 0x9A, 0x18, 0x9B,
0x08, 0x0C, 0x0D, 0x12, 0x13, 0x14, 0x15, 0x16, 0x17, 0x1C, 0x1D, 0x1E, 0x1F
},
{
0x37, 0x02, 0x03, 0x02, 0x03, 0x03, 0x02, 0x03, 0x05, 0x04, 0x04, 0x05, 0x07,
0x04, 0x07, 0x18, 0x17, 0x18, 0x08, 0x67, 0x68, 0x6C, 0x37, 0x28, 0x17, 0x18,
0xCA, 0xCB, 0xCC, 0xCD, 0x68, 0x69, 0x6A, 0x6B, 0xD2, 0xD3, 0xD4, 0xD5, 0xD6,
0xD7, 0x6C, 0x6D, 0xDA, 0xDB, 0x54, 0x55, 0x56, 0x57, 0x64, 0x65, 0x52, 0x53,
0x24, 0x37, 0x38, 0x27, 0x28, 0x58, 0x59, 0x2B, 0x2C, 0x5A, 0x66, 0x67, 0x0F,
0xC8, 0xC9, 0x5B, 0x33, 0x34, 0x35, 0x6C, 0x6D, 0x4A, 0x4B, 0x4C, 0x4D, 0x72,
0x73, 0x74, 0x75, 0x76, 0x77, 0x52, 0x53, 0x54, 0x55, 0x5A, 0x5B, 0x64, 0x65,
0x08, 0x0C, 0x0D, 0x12, 0x13, 0x14, 0x15, 0x16, 0x17, 0x1C, 0x1D, 0x1E, 0x1F
}
}

Definition at line 45 of file faxcompr.c.

Referenced by ff_ccitt_unpack_init().

const uint8_t ccitt_codes_lens[2][CCITT_SYMS]
static
Initial value:
=
{
{
8, 6, 4, 4, 4, 4, 4, 4, 5, 5, 5, 5, 6, 6, 6, 6, 6, 6, 7, 7,
7, 7, 7, 7, 7, 7, 7, 7, 7, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8,
8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8,
8, 8, 8, 8, 5, 5, 6, 7, 8, 8, 8, 8, 8, 8, 9, 9, 9, 9, 9, 9,
9, 9, 9, 9, 9, 9, 9, 9, 9, 6, 9, 11, 11, 11, 12, 12, 12, 12, 12, 12,
12, 12, 12, 12
},
{
10, 3, 2, 2, 3, 4, 4, 5, 6, 6, 7, 7, 7, 8, 8, 9, 10, 10, 10, 11,
11, 11, 11, 11, 11, 11, 12, 12, 12, 12, 12, 12, 12, 12, 12, 12, 12, 12, 12, 12,
12, 12, 12, 12, 12, 12, 12, 12, 12, 12, 12, 12, 12, 12, 12, 12, 12, 12, 12, 12,
12, 12, 12, 12, 10, 12, 12, 12, 12, 12, 12, 13, 13, 13, 13, 13, 13, 13, 13, 13,
13, 13, 13, 13, 13, 13, 13, 13, 13, 13, 13, 11, 11, 11, 12, 12, 12, 12, 12, 12,
12, 12, 12, 12
}
}

Definition at line 69 of file faxcompr.c.

Referenced by ff_ccitt_unpack_init().

const uint8_t ccitt_group3_2d_bits[11]
static
Initial value:
= {
1, 1, 2, 2, 2, 1, 3, 3, 3, 1, 1
}

Definition at line 89 of file faxcompr.c.

Referenced by ff_ccitt_unpack_init().

const uint8_t ccitt_group3_2d_lens[11]
static
Initial value:
= {
4, 3, 7, 6, 3, 1, 3, 6, 7, 7, 9
}

Definition at line 93 of file faxcompr.c.

Referenced by ff_ccitt_unpack_init().

VLC ccitt_vlc[2]
static

Definition at line 97 of file faxcompr.c.

VLC ccitt_group3_2d_vlc
static

Definition at line 97 of file faxcompr.c.