mirror of
https://github.com/FFmpeg/FFmpeg.git
synced 2024-11-26 19:01:44 +02:00
314 lines
11 KiB
C
314 lines
11 KiB
C
/*
|
|
* CCITT Fax Group 3 and 4 decompression
|
|
* Copyright (c) 2008 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
|
|
*/
|
|
|
|
/**
|
|
* CCITT Fax Group 3 and 4 decompression
|
|
* @file faxcompr.c
|
|
* @author Konstantin Shishkov
|
|
*/
|
|
#include "avcodec.h"
|
|
#include "bitstream.h"
|
|
#include "faxcompr.h"
|
|
|
|
#define CCITT_SYMS 104
|
|
|
|
static const uint16_t ccitt_syms[CCITT_SYMS] = {
|
|
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
|
|
};
|
|
|
|
static const uint8_t ccitt_codes_bits[2][CCITT_SYMS] =
|
|
{
|
|
{
|
|
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
|
|
}
|
|
};
|
|
|
|
static const uint8_t ccitt_codes_lens[2][CCITT_SYMS] =
|
|
{
|
|
{
|
|
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
|
|
}
|
|
};
|
|
|
|
static const uint8_t ccitt_group3_2d_bits[11] = {
|
|
1, 1, 2, 2, 2, 1, 3, 3, 3, 1, 1
|
|
};
|
|
|
|
static const uint8_t ccitt_group3_2d_lens[11] = {
|
|
4, 3, 7, 6, 3, 1, 3, 6, 7, 7, 9
|
|
};
|
|
|
|
static VLC ccitt_vlc[2], ccitt_group3_2d_vlc;
|
|
|
|
av_cold void ff_ccitt_unpack_init(void)
|
|
{
|
|
static VLC_TYPE code_table1[528][2];
|
|
static VLC_TYPE code_table2[648][2];
|
|
int i;
|
|
static int initialized = 0;
|
|
|
|
if(initialized)
|
|
return;
|
|
ccitt_vlc[0].table = code_table1;
|
|
ccitt_vlc[0].table_allocated = 528;
|
|
ccitt_vlc[1].table = code_table2;
|
|
ccitt_vlc[1].table_allocated = 648;
|
|
for(i = 0; i < 2; i++){
|
|
init_vlc_sparse(&ccitt_vlc[i], 9, CCITT_SYMS,
|
|
ccitt_codes_lens[i], 1, 1,
|
|
ccitt_codes_bits[i], 1, 1,
|
|
ccitt_syms, 2, 2,
|
|
INIT_VLC_USE_NEW_STATIC);
|
|
}
|
|
INIT_VLC_STATIC(&ccitt_group3_2d_vlc, 9, 11,
|
|
ccitt_group3_2d_lens, 1, 1,
|
|
ccitt_group3_2d_bits, 1, 1, 512);
|
|
initialized = 1;
|
|
}
|
|
|
|
|
|
static int decode_group3_1d_line(AVCodecContext *avctx, GetBitContext *gb,
|
|
unsigned int pix_left, int *runs, const int *runend)
|
|
{
|
|
int mode = 0;
|
|
unsigned int run=0;
|
|
unsigned int t;
|
|
for(;;){
|
|
t = get_vlc2(gb, ccitt_vlc[mode].table, 9, 2);
|
|
run += t;
|
|
if(t < 64){
|
|
*runs++ = run;
|
|
if(runs >= runend){
|
|
av_log(avctx, AV_LOG_ERROR, "Run overrun\n");
|
|
return -1;
|
|
}
|
|
if(pix_left <= run){
|
|
if(pix_left == run)
|
|
break;
|
|
av_log(avctx, AV_LOG_ERROR, "Run went out of bounds\n");
|
|
return -1;
|
|
}
|
|
pix_left -= run;
|
|
run = 0;
|
|
mode = !mode;
|
|
}else if((int)t == -1){
|
|
av_log(avctx, AV_LOG_ERROR, "Incorrect code\n");
|
|
return -1;
|
|
}
|
|
}
|
|
*runs++ = 0;
|
|
return 0;
|
|
}
|
|
|
|
static int decode_group3_2d_line(AVCodecContext *avctx, GetBitContext *gb,
|
|
unsigned int width, int *runs, const int *runend, const int *ref)
|
|
{
|
|
int mode = 0, saved_run = 0, t;
|
|
int run_off = *ref++;
|
|
unsigned int offs=0, run= 0;
|
|
|
|
runend--; // for the last written 0
|
|
|
|
while(offs < width){
|
|
int cmode = get_vlc2(gb, ccitt_group3_2d_vlc.table, 9, 1);
|
|
if(cmode == -1){
|
|
av_log(avctx, AV_LOG_ERROR, "Incorrect mode VLC\n");
|
|
return -1;
|
|
}
|
|
if(!cmode){//pass mode
|
|
run_off += *ref++;
|
|
run = run_off - offs;
|
|
offs= run_off;
|
|
run_off += *ref++;
|
|
if(offs > width){
|
|
av_log(avctx, AV_LOG_ERROR, "Run went out of bounds\n");
|
|
return -1;
|
|
}
|
|
saved_run += run;
|
|
}else if(cmode == 1){//horizontal mode
|
|
int k;
|
|
for(k = 0; k < 2; k++){
|
|
run = 0;
|
|
for(;;){
|
|
t = get_vlc2(gb, ccitt_vlc[mode].table, 9, 2);
|
|
if(t == -1){
|
|
av_log(avctx, AV_LOG_ERROR, "Incorrect code\n");
|
|
return -1;
|
|
}
|
|
run += t;
|
|
if(t < 64)
|
|
break;
|
|
}
|
|
*runs++ = run + saved_run;
|
|
if(runs >= runend){
|
|
av_log(avctx, AV_LOG_ERROR, "Run overrun\n");
|
|
return -1;
|
|
}
|
|
saved_run = 0;
|
|
offs += run;
|
|
if(offs > width || run > width){
|
|
av_log(avctx, AV_LOG_ERROR, "Run went out of bounds\n");
|
|
return -1;
|
|
}
|
|
mode = !mode;
|
|
}
|
|
}else if(cmode == 9 || cmode == 10){
|
|
av_log(avctx, AV_LOG_ERROR, "Special modes are not supported (yet)\n");
|
|
return -1;
|
|
}else{//vertical mode
|
|
run = run_off - offs + (cmode - 5);
|
|
run_off -= *--ref;
|
|
offs += run;
|
|
if(offs > width || run > width){
|
|
av_log(avctx, AV_LOG_ERROR, "Run went out of bounds\n");
|
|
return -1;
|
|
}
|
|
*runs++ = run + saved_run;
|
|
if(runs >= runend){
|
|
av_log(avctx, AV_LOG_ERROR, "Run overrun\n");
|
|
return -1;
|
|
}
|
|
saved_run = 0;
|
|
mode = !mode;
|
|
}
|
|
//sync line pointers
|
|
while(run_off <= offs){
|
|
run_off += *ref++;
|
|
run_off += *ref++;
|
|
}
|
|
}
|
|
*runs++ = saved_run;
|
|
*runs++ = 0;
|
|
return 0;
|
|
}
|
|
|
|
static void put_line(uint8_t *dst, int size, int width, const int *runs)
|
|
{
|
|
PutBitContext pb;
|
|
int run, mode = ~0, pix_left = width, run_idx = 0;
|
|
|
|
init_put_bits(&pb, dst, size*8);
|
|
while(pix_left > 0){
|
|
run = runs[run_idx++];
|
|
mode = ~mode;
|
|
pix_left -= run;
|
|
for(; run > 16; run -= 16)
|
|
put_sbits(&pb, 16, mode);
|
|
if(run)
|
|
put_sbits(&pb, run, mode);
|
|
}
|
|
}
|
|
|
|
static int find_group3_syncmarker(GetBitContext *gb, int srcsize)
|
|
{
|
|
unsigned int state = -1;
|
|
srcsize -= get_bits_count(gb);
|
|
while(srcsize-- > 0){
|
|
state+= state + get_bits1(gb);
|
|
if((state & 0xFFF) == 1)
|
|
return 0;
|
|
}
|
|
return -1;
|
|
}
|
|
|
|
int ff_ccitt_unpack(AVCodecContext *avctx,
|
|
const uint8_t *src, int srcsize,
|
|
uint8_t *dst, int height, int stride, enum TiffCompr compr)
|
|
{
|
|
int j;
|
|
GetBitContext gb;
|
|
int *runs, *ref, *runend;
|
|
int ret;
|
|
int runsize= avctx->width + 2;
|
|
|
|
runs = av_malloc(runsize * sizeof(runs[0]));
|
|
ref = av_malloc(runsize * sizeof(ref[0]));
|
|
ref[0] = avctx->width;
|
|
ref[1] = 0;
|
|
ref[2] = 0;
|
|
init_get_bits(&gb, src, srcsize*8);
|
|
for(j = 0; j < height; j++){
|
|
runend = runs + runsize;
|
|
if(compr == TIFF_G4){
|
|
ret = decode_group3_2d_line(avctx, &gb, avctx->width, runs, runend, ref);
|
|
if(ret < 0){
|
|
av_free(runs);
|
|
av_free(ref);
|
|
return -1;
|
|
}
|
|
}else{
|
|
if(find_group3_syncmarker(&gb, srcsize*8) < 0)
|
|
break;
|
|
if(compr==TIFF_CCITT_RLE || get_bits1(&gb))
|
|
ret = decode_group3_1d_line(avctx, &gb, avctx->width, runs, runend);
|
|
else
|
|
ret = decode_group3_2d_line(avctx, &gb, avctx->width, runs, runend, ref);
|
|
}
|
|
if(ret < 0){
|
|
put_line(dst, stride, avctx->width, ref);
|
|
}else{
|
|
put_line(dst, stride, avctx->width, runs);
|
|
FFSWAP(int*, runs, ref);
|
|
}
|
|
dst += stride;
|
|
}
|
|
av_free(runs);
|
|
av_free(ref);
|
|
return 0;
|
|
}
|