[libav.git] / libavcodec / faxcompr.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()
{
    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++];
        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_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;
}
Commit	Line	Data
8d48db31 MN	1	/*
	2	* CCITT Fax Group 3 and 4 decompression
	3	* Copyright (c) 2008 Konstantin Shishkov
	4	*
	5	* This file is part of FFmpeg.
	6	*
	7	* FFmpeg is free software; you can redistribute it and/or
	8	* modify it under the terms of the GNU Lesser General Public
	9	* License as published by the Free Software Foundation; either
	10	* version 2.1 of the License, or (at your option) any later version.
	11	*
	12	* FFmpeg is distributed in the hope that it will be useful,
	13	* but WITHOUT ANY WARRANTY; without even the implied warranty of
	14	* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
	15	* Lesser General Public License for more details.
	16	*
	17	* You should have received a copy of the GNU Lesser General Public
	18	* License along with FFmpeg; if not, write to the Free Software
	19	* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
	20	*/
	21
	22	/**
	23	* CCITT Fax Group 3 and 4 decompression
	24	* @file faxcompr.c
	25	* @author Konstantin Shishkov
	26	*/
	27	#include "avcodec.h"
	28	#include "bitstream.h"
	29	#include "faxcompr.h"
	30
	31	#define CCITT_SYMS 104
	32
	33	static const uint16_t ccitt_syms[CCITT_SYMS] = {
	34	0, 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12,
	35	13, 14, 15, 16, 17, 18, 19, 20, 21, 22, 23, 24, 25,
	36	26, 27, 28, 29, 30, 31, 32, 33, 34, 35, 36, 37, 38,
	37	39, 40, 41, 42, 43, 44, 45, 46, 47, 48, 49, 50, 51,
	38	52, 53, 54, 55, 56, 57, 58, 59, 60, 61, 62, 63, 64,
	39	128, 192, 256, 320, 384, 448, 512, 576, 640, 704, 768, 832, 896,
	40	960, 1024, 1088, 1152, 1216, 1280, 1344, 1408, 1472, 1536, 1600, 1664, 1728,
	41	1792, 1856, 1920, 1984, 2048, 2112, 2176, 2240, 2304, 2368, 2432, 2496, 2560
	42	};
	43
	44	static const uint8_t ccitt_codes_bits[2][CCITT_SYMS] =
	45	{
	46	{
	47	0x35, 0x07, 0x07, 0x08, 0x0B, 0x0C, 0x0E, 0x0F, 0x13, 0x14, 0x07, 0x08, 0x08,
	48	0x03, 0x34, 0x35, 0x2A, 0x2B, 0x27, 0x0C, 0x08, 0x17, 0x03, 0x04, 0x28, 0x2B,
	49	0x13, 0x24, 0x18, 0x02, 0x03, 0x1A, 0x1B, 0x12, 0x13, 0x14, 0x15, 0x16, 0x17,
	50	0x28, 0x29, 0x2A, 0x2B, 0x2C, 0x2D, 0x04, 0x05, 0x0A, 0x0B, 0x52, 0x53, 0x54,
	51	0x55, 0x24, 0x25, 0x58, 0x59, 0x5A, 0x5B, 0x4A, 0x4B, 0x32, 0x33, 0x34, 0x1B,
	52	0x12, 0x17, 0x37, 0x36, 0x37, 0x64, 0x65, 0x68, 0x67, 0xCC, 0xCD, 0xD2, 0xD3,
	53	0xD4, 0xD5, 0xD6, 0xD7, 0xD8, 0xD9, 0xDA, 0xDB, 0x98, 0x99, 0x9A, 0x18, 0x9B,
	54	0x08, 0x0C, 0x0D, 0x12, 0x13, 0x14, 0x15, 0x16, 0x17, 0x1C, 0x1D, 0x1E, 0x1F
	55	},
	56	{
	57	0x37, 0x02, 0x03, 0x02, 0x03, 0x03, 0x02, 0x03, 0x05, 0x04, 0x04, 0x05, 0x07,
	58	0x04, 0x07, 0x18, 0x17, 0x18, 0x08, 0x67, 0x68, 0x6C, 0x37, 0x28, 0x17, 0x18,
	59	0xCA, 0xCB, 0xCC, 0xCD, 0x68, 0x69, 0x6A, 0x6B, 0xD2, 0xD3, 0xD4, 0xD5, 0xD6,
	60	0xD7, 0x6C, 0x6D, 0xDA, 0xDB, 0x54, 0x55, 0x56, 0x57, 0x64, 0x65, 0x52, 0x53,
	61	0x24, 0x37, 0x38, 0x27, 0x28, 0x58, 0x59, 0x2B, 0x2C, 0x5A, 0x66, 0x67, 0x0F,
	62	0xC8, 0xC9, 0x5B, 0x33, 0x34, 0x35, 0x6C, 0x6D, 0x4A, 0x4B, 0x4C, 0x4D, 0x72,
	63	0x73, 0x74, 0x75, 0x76, 0x77, 0x52, 0x53, 0x54, 0x55, 0x5A, 0x5B, 0x64, 0x65,
	64	0x08, 0x0C, 0x0D, 0x12, 0x13, 0x14, 0x15, 0x16, 0x17, 0x1C, 0x1D, 0x1E, 0x1F
65	}
66	};
67
68	static const uint8_t ccitt_codes_lens[2][CCITT_SYMS] =
69	{
70	{
71	8, 6, 4, 4, 4, 4, 4, 4, 5, 5, 5, 5, 6, 6, 6, 6, 6, 6, 7, 7,
72	7, 7, 7, 7, 7, 7, 7, 7, 7, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8,
73	8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8,
74	8, 8, 8, 8, 5, 5, 6, 7, 8, 8, 8, 8, 8, 8, 9, 9, 9, 9, 9, 9,
75	9, 9, 9, 9, 9, 9, 9, 9, 9, 6, 9, 11, 11, 11, 12, 12, 12, 12, 12, 12,
76	12, 12, 12, 12
77	},
78	{
79	10, 3, 2, 2, 3, 4, 4, 5, 6, 6, 7, 7, 7, 8, 8, 9, 10, 10, 10, 11,
80	11, 11, 11, 11, 11, 11, 12, 12, 12, 12, 12, 12, 12, 12, 12, 12, 12, 12, 12, 12,
81	12, 12, 12, 12, 12, 12, 12, 12, 12, 12, 12, 12, 12, 12, 12, 12, 12, 12, 12, 12,
82	12, 12, 12, 12, 10, 12, 12, 12, 12, 12, 12, 13, 13, 13, 13, 13, 13, 13, 13, 13,
83	13, 13, 13, 13, 13, 13, 13, 13, 13, 13, 13, 11, 11, 11, 12, 12, 12, 12, 12, 12,
84	12, 12, 12, 12
85	}
86	};
87
88	static const uint8_t ccitt_group3_2d_bits[11] = {
89	1, 1, 2, 2, 2, 1, 3, 3, 3, 1, 1
90	};
91
92	static const uint8_t ccitt_group3_2d_lens[11] = {
93	4, 3, 7, 6, 3, 1, 3, 6, 7, 7, 9
94	};
95
96	static VLC ccitt_vlc[2], ccitt_group3_2d_vlc;
97
98	av_cold void ff_ccitt_unpack_init()
99	{
100	static VLC_TYPE code_table1[528][2];
101	static VLC_TYPE code_table2[648][2];
102	int i;
103	static int initialized = 0;
104
105	if(initialized)
106	return;
107	ccitt_vlc[0].table = code_table1;
108	ccitt_vlc[0].table_allocated = 528;
109	ccitt_vlc[1].table = code_table2;
110	ccitt_vlc[1].table_allocated = 648;
111	for(i = 0; i < 2; i++){
112	init_vlc_sparse(&ccitt_vlc[i], 9, CCITT_SYMS,
113	ccitt_codes_lens[i], 1, 1,
114	ccitt_codes_bits[i], 1, 1,
115	ccitt_syms, 2, 2,
116	INIT_VLC_USE_NEW_STATIC);
117	}
118	INIT_VLC_STATIC(&ccitt_group3_2d_vlc, 9, 11,
119	ccitt_group3_2d_lens, 1, 1,
120	ccitt_group3_2d_bits, 1, 1, 512);
121	initialized = 1;
122	}
123
124
125	static int decode_group3_1d_line(AVCodecContext avctx, GetBitContext gb,
126	int pix_left, int *runs)
127	{
128	int mode = 0, run = 0;
129	unsigned int t;
130	for(;;){
131	t = get_vlc2(gb, ccitt_vlc[mode].table, 9, 2);
132	run += t;
133	if(t < 64){
134	pix_left -= run;
135	*runs++ = run;
136	if(pix_left <= 0){
137	if(!pix_left)
138	break;
139	runs[-1] = 0;
140	av_log(avctx, AV_LOG_ERROR, "Run went out of bounds\n");
141	return -1;
142	}
143	run = 0;
144	mode = !mode;
145	}else if((int)t == -1){
146	av_log(avctx, AV_LOG_ERROR, "Incorrect code\n");
147	return -1;
148	}
149	}
150	*runs++ = 0;
151	return 0;
152	}
153
154	static int decode_group3_2d_line(AVCodecContext avctx, GetBitContext gb,
155	int pix_left, int runs, const int ref)
156	{
157	int mode = 0, offs = 0, run = 0, saved_run = 0, t;
158	int run_off = *ref++;
159	int *run_start = runs;
160
161	while(pix_left > 0){
162	int cmode = get_vlc2(gb, ccitt_group3_2d_vlc.table, 9, 1);
163	if(cmode == -1){
164	av_log(avctx, AV_LOG_ERROR, "Incorrect mode VLC\n");
165	return -1;
166	}
167	//sync line pointers
168	if(runs != run_start)while(run_off <= offs && run_off < avctx->width){
169	run_off += *ref++;
170	run_off += *ref++;
171	}
172	if(!cmode){//pass mode
173	run_off += *ref++;
174	run = run_off - offs;
175	run_off += *ref++;
176	pix_left -= run;
177	if(pix_left < 0){
178	av_log(avctx, AV_LOG_ERROR, "Run went out of bounds\n");
179	return -1;
180	}
181	offs += run;
182	saved_run += run;
183	}else if(cmode == 1){//horizontal mode
184	int k;
185	for(k = 0; k < 2; k++){
186	run = 0;
187	for(;;){
188	t = get_vlc2(gb, ccitt_vlc[mode].table, 9, 2);
189	if(t == -1){
190	av_log(avctx, AV_LOG_ERROR, "Incorrect code\n");
191	return -1;
192	}
193	run += t;
194	if(t < 64)
195	break;
196	}
197	*runs++ = run + saved_run;
198	saved_run = 0;
199	if(pix_left < run){
200	av_log(avctx, AV_LOG_ERROR, "Run went out of bounds\n");
201	return -1;
202	}
203	pix_left -= run;
204	offs += run;
205	mode = !mode;
206	}
207	}else if(cmode == 9 \|\| cmode == 10){
208	av_log(avctx, AV_LOG_ERROR, "Special modes are not supported (yet)\n");
209	return -1;
210	}else{//vertical mode
211	run = run_off - offs + (cmode - 5);
212	if(cmode >= 5)
213	run_off += *ref++;
214	else
215	run_off -= *--ref;
216	pix_left -= run;
217	if(pix_left < 0){
218	av_log(avctx, AV_LOG_ERROR, "Run went out of bounds\n");
219	return -1;
220	}
221	offs += run;
222	*runs++ = run + saved_run;
223	saved_run = 0;
224	mode = !mode;
225	}
226	}
227	*runs++ = saved_run;
228	*runs++ = 0;
229	return 0;
230	}
231
232	static void put_line(uint8_t dst, int size, int width, const int runs)
233	{
234	PutBitContext pb;
bc0f7a9c	235	int run, mode = ~0, pix_left = width, run_idx = 0;
8d48db31 MN	236
	237	init_put_bits(&pb, dst, size*8);
	238	while(pix_left > 0){
	239	run = runs[run_idx++];
bc0f7a9c	240	mode = ~mode;
8d48db31 MN	241	pix_left -= run;
8d48db31 MN	242	for(; run > 16; run -= 16)
bc0f7a9c	243	put_sbits(&pb, 16, mode);
68d48cc5	244	if(run)
679f3fa9	245	put_sbits(&pb, run, mode);
8d48db31 MN	246	}
	247	}
	248
	249	static int find_group3_syncmarker(GetBitContext *gb, int srcsize)
	250	{
eb12536a MN	251	unsigned int state = -1;
	252	srcsize -= get_bits_count(gb);
	253	while(srcsize-- > 0){
	254	state+= state + get_bits1(gb);
ec5bdf49	255	if((state & 0xFFF) == 1)
eb12536a	256	return 0;
8d48db31	257	}
eb12536a	258	return -1;
8d48db31 MN	259	}
	260
	261	int ff_ccitt_unpack_1d(AVCodecContext *avctx,
	262	const uint8_t *src, int srcsize,
	263	uint8_t *dst, int height, int stride)
	264	{
	265	int j;
	266	GetBitContext gb;
	267	int runs, last;
	268
	269	runs = av_malloc(avctx->width * sizeof(runs[0]));
	270	last = av_malloc(avctx->width * sizeof(last[0]));
	271	init_get_bits(&gb, src, srcsize*8);
	272	for(j = 0; j < height; j++){
	273	if(find_group3_syncmarker(&gb, srcsize*8) < 0)
	274	break;
	275	if(decode_group3_1d_line(avctx, &gb, avctx->width, runs) < 0){
	276	put_line(dst, stride, avctx->width, last);
	277	}else{
	278	put_line(dst, stride, avctx->width, runs);
	279	FFSWAP(int*, last, runs);
	280	}
	281	dst += stride;
	282	}
	283	av_free(runs);
	284	av_free(last);
	285	return 0;
	286	}
	287
	288	int ff_ccitt_unpack_2d(AVCodecContext *avctx,
	289	const uint8_t *src, int srcsize,
	290	uint8_t *dst, int height, int stride, int g4)
	291	{
	292	int j;
	293	GetBitContext gb;
	294	int runs, ref;
	295	int ret;
	296
	297	runs = av_malloc((avctx->width + 2) * sizeof(runs[0]));
	298	ref = av_malloc((avctx->width + 2) * sizeof(ref[0]));
	299	ref[0] = avctx->width;
	300	ref[1] = 0;
	301	ref[2] = 0;
	302	init_get_bits(&gb, src, srcsize*8);
	303	for(j = 0; j < height; j++){
	304	if(g4){
	305	ret = decode_group3_2d_line(avctx, &gb, avctx->width, runs, ref);
	306	if(ret < 0){
	307	av_free(runs);
	308	av_free(ref);
	309	return -1;
	310	}
	311	}else{
	312	if(find_group3_syncmarker(&gb, srcsize*8) < 0)
	313	break;
	314	if(get_bits1(&gb))
	315	ret = decode_group3_1d_line(avctx, &gb, avctx->width, runs);
	316	else
	317	ret = decode_group3_2d_line(avctx, &gb, avctx->width, runs, ref);
	318	}
	319	if(ret < 0){
	320	put_line(dst, stride, avctx->width, ref);
	321	}else{
	322	put_line(dst, stride, avctx->width, runs);
323	FFSWAP(int*, runs, ref);
324	}
325	dst += stride;
326	}
327	av_free(runs);
328	av_free(ref);
329	return 0;
330	}