mirror of https://github.com/FFmpeg/FFmpeg.git
Will be activated after a little more reviewing and fixing by me. Commited now, so as to not lose history of that. Originally committed as revision 16323 to svn://svn.ffmpeg.org/ffmpeg/trunkpull/126/head
parent
df2a3f2714
commit
8d48db314e
2 changed files with 384 additions and 0 deletions
@ -0,0 +1,333 @@ |
||||
/*
|
||||
* 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() |
||||
{ |
||||
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, |
||||
int pix_left, int *runs) |
||||
{ |
||||
int mode = 0, run = 0; |
||||
unsigned int t; |
||||
for(;;){ |
||||
t = get_vlc2(gb, ccitt_vlc[mode].table, 9, 2); |
||||
run += t; |
||||
if(t < 64){ |
||||
pix_left -= run; |
||||
*runs++ = run; |
||||
if(pix_left <= 0){ |
||||
if(!pix_left) |
||||
break; |
||||
runs[-1] = 0; |
||||
av_log(avctx, AV_LOG_ERROR, "Run went out of bounds\n"); |
||||
return -1; |
||||
} |
||||
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, |
||||
int pix_left, int *runs, const int *ref) |
||||
{ |
||||
int mode = 0, offs = 0, run = 0, saved_run = 0, t; |
||||
int run_off = *ref++; |
||||
int *run_start = runs; |
||||
|
||||
while(pix_left > 0){ |
||||
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; |
||||
} |
||||
//sync line pointers
|
||||
if(runs != run_start)while(run_off <= offs && run_off < avctx->width){ |
||||
run_off += *ref++; |
||||
run_off += *ref++; |
||||
} |
||||
if(!cmode){//pass mode
|
||||
run_off += *ref++; |
||||
run = run_off - offs; |
||||
run_off += *ref++; |
||||
pix_left -= run; |
||||
if(pix_left < 0){ |
||||
av_log(avctx, AV_LOG_ERROR, "Run went out of bounds\n"); |
||||
return -1; |
||||
} |
||||
offs += run; |
||||
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; |
||||
saved_run = 0; |
||||
if(pix_left < run){ |
||||
av_log(avctx, AV_LOG_ERROR, "Run went out of bounds\n"); |
||||
return -1; |
||||
} |
||||
pix_left -= run; |
||||
offs += run; |
||||
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); |
||||
if(cmode >= 5) |
||||
run_off += *ref++; |
||||
else |
||||
run_off -= *--ref; |
||||
pix_left -= run; |
||||
if(pix_left < 0){ |
||||
av_log(avctx, AV_LOG_ERROR, "Run went out of bounds\n"); |
||||
return -1; |
||||
} |
||||
offs += run; |
||||
*runs++ = run + saved_run; |
||||
saved_run = 0; |
||||
mode = !mode; |
||||
} |
||||
} |
||||
*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++]; |
||||
if(!run){ |
||||
mode = !mode; |
||||
continue; |
||||
} |
||||
pix_left -= run; |
||||
for(; run > 16; run -= 16) |
||||
put_sbits(&pb, 16, -mode); |
||||
put_sbits(&pb, run, -mode); |
||||
mode = !mode; |
||||
} |
||||
} |
||||
|
||||
static int find_group3_syncmarker(GetBitContext *gb, int srcsize) |
||||
{ |
||||
int state = get_bits(gb, 12); |
||||
int rem = srcsize - get_bits_count(gb); |
||||
while((state & 0xFFF) != 1){ |
||||
state = (state << 1) | get_bits1(gb); |
||||
if(--rem <= 0) |
||||
return -1; |
||||
} |
||||
return 0; |
||||
} |
||||
|
||||
int ff_ccitt_unpack_1d(AVCodecContext *avctx, |
||||
const uint8_t *src, int srcsize, |
||||
uint8_t *dst, int height, int stride) |
||||
{ |
||||
int j; |
||||
GetBitContext gb; |
||||
int *runs, *last; |
||||
|
||||
runs = av_malloc(avctx->width * sizeof(runs[0])); |
||||
last = av_malloc(avctx->width * sizeof(last[0])); |
||||
init_get_bits(&gb, src, srcsize*8); |
||||
for(j = 0; j < height; j++){ |
||||
if(find_group3_syncmarker(&gb, srcsize*8) < 0) |
||||
break; |
||||
if(decode_group3_1d_line(avctx, &gb, avctx->width, runs) < 0){ |
||||
put_line(dst, stride, avctx->width, last); |
||||
}else{ |
||||
put_line(dst, stride, avctx->width, runs); |
||||
FFSWAP(int*, last, runs); |
||||
} |
||||
dst += stride; |
||||
} |
||||
av_free(runs); |
||||
av_free(last); |
||||
return 0; |
||||
} |
||||
|
||||
int ff_ccitt_unpack_2d(AVCodecContext *avctx, |
||||
const uint8_t *src, int srcsize, |
||||
uint8_t *dst, int height, int stride, int g4) |
||||
{ |
||||
int j; |
||||
GetBitContext gb; |
||||
int *runs, *ref; |
||||
int ret; |
||||
|
||||
runs = av_malloc((avctx->width + 2) * sizeof(runs[0])); |
||||
ref = av_malloc((avctx->width + 2) * 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++){ |
||||
if(g4){ |
||||
ret = decode_group3_2d_line(avctx, &gb, avctx->width, runs, ref); |
||||
if(ret < 0){ |
||||
av_free(runs); |
||||
av_free(ref); |
||||
return -1; |
||||
} |
||||
}else{ |
||||
if(find_group3_syncmarker(&gb, srcsize*8) < 0) |
||||
break; |
||||
if(get_bits1(&gb)) |
||||
ret = decode_group3_1d_line(avctx, &gb, avctx->width, runs); |
||||
else |
||||
ret = decode_group3_2d_line(avctx, &gb, avctx->width, runs, 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; |
||||
} |
@ -0,0 +1,51 @@ |
||||
/*
|
||||
* 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.h |
||||
* @author Konstantin Shishkov |
||||
*/ |
||||
#ifndef AVCODEC_FAXCOMPR_H |
||||
#define AVCODEC_FAXCOMPR_H |
||||
|
||||
#include "avcodec.h" |
||||
|
||||
/**
|
||||
* initialize upacker code |
||||
*/ |
||||
void ff_ccitt_unpack_init(); |
||||
|
||||
/**
|
||||
* unpack data compressed with CCITT Group 3 1-D method |
||||
*/ |
||||
int ff_ccitt_unpack_1d(AVCodecContext *avctx, |
||||
const uint8_t *src, int srcsize, |
||||
uint8_t *dst, int height, int stride); |
||||
|
||||
/**
|
||||
* unpack data compressed with CCITT Group 3 2-D or Group 4 method |
||||
*/ |
||||
int ff_ccitt_unpack_2d(AVCodecContext *avctx, |
||||
const uint8_t *src, int srcsize, |
||||
uint8_t *dst, int height, int stride, int g4); |
||||
|
||||
#endif /* AVCODEC_FAXCOMPR_H */ |
Loading…
Reference in new issue