FFmpeg
faxcompr.c
Go to the documentation of this file.
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  * @file
24  * CCITT Fax Group 3 and 4 decompression
25  * @author Konstantin Shishkov
26  */
27 #include "libavutil/thread.h"
28 #include "avcodec.h"
29 #include "get_bits.h"
30 #include "put_bits.h"
31 #include "faxcompr.h"
32 
33 #define CCITT_SYMS 104
34 
35 static const uint16_t ccitt_syms[CCITT_SYMS] = {
36  0, 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12,
37  13, 14, 15, 16, 17, 18, 19, 20, 21, 22, 23, 24, 25,
38  26, 27, 28, 29, 30, 31, 32, 33, 34, 35, 36, 37, 38,
39  39, 40, 41, 42, 43, 44, 45, 46, 47, 48, 49, 50, 51,
40  52, 53, 54, 55, 56, 57, 58, 59, 60, 61, 62, 63, 64,
41  128, 192, 256, 320, 384, 448, 512, 576, 640, 704, 768, 832, 896,
42  960, 1024, 1088, 1152, 1216, 1280, 1344, 1408, 1472, 1536, 1600, 1664, 1728,
43  1792, 1856, 1920, 1984, 2048, 2112, 2176, 2240, 2304, 2368, 2432, 2496, 2560
44 };
45 
46 static const uint8_t ccitt_codes_bits[2][CCITT_SYMS] =
47 {
48  {
49  0x35, 0x07, 0x07, 0x08, 0x0B, 0x0C, 0x0E, 0x0F, 0x13, 0x14, 0x07, 0x08, 0x08,
50  0x03, 0x34, 0x35, 0x2A, 0x2B, 0x27, 0x0C, 0x08, 0x17, 0x03, 0x04, 0x28, 0x2B,
51  0x13, 0x24, 0x18, 0x02, 0x03, 0x1A, 0x1B, 0x12, 0x13, 0x14, 0x15, 0x16, 0x17,
52  0x28, 0x29, 0x2A, 0x2B, 0x2C, 0x2D, 0x04, 0x05, 0x0A, 0x0B, 0x52, 0x53, 0x54,
53  0x55, 0x24, 0x25, 0x58, 0x59, 0x5A, 0x5B, 0x4A, 0x4B, 0x32, 0x33, 0x34, 0x1B,
54  0x12, 0x17, 0x37, 0x36, 0x37, 0x64, 0x65, 0x68, 0x67, 0xCC, 0xCD, 0xD2, 0xD3,
55  0xD4, 0xD5, 0xD6, 0xD7, 0xD8, 0xD9, 0xDA, 0xDB, 0x98, 0x99, 0x9A, 0x18, 0x9B,
56  0x08, 0x0C, 0x0D, 0x12, 0x13, 0x14, 0x15, 0x16, 0x17, 0x1C, 0x1D, 0x1E, 0x1F
57  },
58  {
59  0x37, 0x02, 0x03, 0x02, 0x03, 0x03, 0x02, 0x03, 0x05, 0x04, 0x04, 0x05, 0x07,
60  0x04, 0x07, 0x18, 0x17, 0x18, 0x08, 0x67, 0x68, 0x6C, 0x37, 0x28, 0x17, 0x18,
61  0xCA, 0xCB, 0xCC, 0xCD, 0x68, 0x69, 0x6A, 0x6B, 0xD2, 0xD3, 0xD4, 0xD5, 0xD6,
62  0xD7, 0x6C, 0x6D, 0xDA, 0xDB, 0x54, 0x55, 0x56, 0x57, 0x64, 0x65, 0x52, 0x53,
63  0x24, 0x37, 0x38, 0x27, 0x28, 0x58, 0x59, 0x2B, 0x2C, 0x5A, 0x66, 0x67, 0x0F,
64  0xC8, 0xC9, 0x5B, 0x33, 0x34, 0x35, 0x6C, 0x6D, 0x4A, 0x4B, 0x4C, 0x4D, 0x72,
65  0x73, 0x74, 0x75, 0x76, 0x77, 0x52, 0x53, 0x54, 0x55, 0x5A, 0x5B, 0x64, 0x65,
66  0x08, 0x0C, 0x0D, 0x12, 0x13, 0x14, 0x15, 0x16, 0x17, 0x1C, 0x1D, 0x1E, 0x1F
67  }
68 };
69 
70 static const uint8_t ccitt_codes_lens[2][CCITT_SYMS] =
71 {
72  {
73  8, 6, 4, 4, 4, 4, 4, 4, 5, 5, 5, 5, 6, 6, 6, 6, 6, 6, 7, 7,
74  7, 7, 7, 7, 7, 7, 7, 7, 7, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8,
75  8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8,
76  8, 8, 8, 8, 5, 5, 6, 7, 8, 8, 8, 8, 8, 8, 9, 9, 9, 9, 9, 9,
77  9, 9, 9, 9, 9, 9, 9, 9, 9, 6, 9, 11, 11, 11, 12, 12, 12, 12, 12, 12,
78  12, 12, 12, 12
79  },
80  {
81  10, 3, 2, 2, 3, 4, 4, 5, 6, 6, 7, 7, 7, 8, 8, 9, 10, 10, 10, 11,
82  11, 11, 11, 11, 11, 11, 12, 12, 12, 12, 12, 12, 12, 12, 12, 12, 12, 12, 12, 12,
83  12, 12, 12, 12, 12, 12, 12, 12, 12, 12, 12, 12, 12, 12, 12, 12, 12, 12, 12, 12,
84  12, 12, 12, 12, 10, 12, 12, 12, 12, 12, 12, 13, 13, 13, 13, 13, 13, 13, 13, 13,
85  13, 13, 13, 13, 13, 13, 13, 13, 13, 13, 13, 11, 11, 11, 12, 12, 12, 12, 12, 12,
86  12, 12, 12, 12
87  }
88 };
89 
90 static const uint8_t ccitt_group3_2d_bits[11] = {
91  1, 1, 2, 2, 2, 1, 3, 3, 3, 1, 1
92 };
93 
94 static const uint8_t ccitt_group3_2d_lens[11] = {
95  4, 3, 7, 6, 3, 1, 3, 6, 7, 7, 9
96 };
97 
98 static VLC ccitt_vlc[2], ccitt_group3_2d_vlc;
99 
100 static av_cold void ccitt_unpack_init(void)
101 {
102  static VLC_TYPE code_table1[528][2];
103  static VLC_TYPE code_table2[648][2];
104  int i;
105 
106  ccitt_vlc[0].table = code_table1;
107  ccitt_vlc[0].table_allocated = 528;
108  ccitt_vlc[1].table = code_table2;
109  ccitt_vlc[1].table_allocated = 648;
110  for (i = 0; i < 2; i++) {
111  ff_init_vlc_sparse(&ccitt_vlc[i], 9, CCITT_SYMS,
112  ccitt_codes_lens[i], 1, 1,
113  ccitt_codes_bits[i], 1, 1,
114  ccitt_syms, 2, 2,
115  INIT_VLC_USE_NEW_STATIC);
116  }
117  INIT_VLC_STATIC(&ccitt_group3_2d_vlc, 9, 11,
118  ccitt_group3_2d_lens, 1, 1,
119  ccitt_group3_2d_bits, 1, 1, 512);
120 }
121 
122 av_cold void ff_ccitt_unpack_init(void)
123 {
124  static AVOnce init_static_once = AV_ONCE_INIT;
125  ff_thread_once(&init_static_once, ccitt_unpack_init);
126 }
127 
128 static int decode_uncompressed(AVCodecContext *avctx, GetBitContext *gb,
129  unsigned int *pix_left, int **runs,
130  const int *runend, int *mode)
131 {
132  int eob = 0;
133  int newmode;
134  int saved_run = 0;
135 
136  do {
137  int cwi, k;
138  int cw = 0;
139  int codes[2];
140  do {
141  cwi = show_bits(gb, 11);
142  if (!cwi) {
143  av_log(avctx, AV_LOG_ERROR, "Invalid uncompressed codeword\n");
144  return AVERROR_INVALIDDATA;
145  }
146  cwi = 10 - av_log2(cwi);
147  if (get_bits_left(gb) < cwi + 1)
148  return AVERROR_INVALIDDATA;
149  skip_bits(gb, cwi + 1);
150  if (cwi > 5) {
151  newmode = get_bits1(gb);
152  eob = 1;
153  cwi -= 6;
154  }
155  cw += cwi;
156  } while(cwi == 5);
157 
158  codes[0] = cw;
159  codes[1] = !eob;
160 
161  for (k = 0; k < 2; k++) {
162  if (codes[k]) {
163  if (*mode == !k) {
164  *(*runs)++ = saved_run;
165  if (*runs >= runend) {
166  av_log(avctx, AV_LOG_ERROR, "uncompressed run overrun\n");
167  return AVERROR_INVALIDDATA;
168  }
169  if (*pix_left <= saved_run) {
170  av_log(avctx, AV_LOG_ERROR, "uncompressed run went out of bounds\n");
171  return AVERROR_INVALIDDATA;
172  }
173  *pix_left -= saved_run;
174  saved_run = 0;
175  *mode = !*mode;
176  }
177  saved_run += codes[k];
178  }
179  }
180  } while (!eob);
181  *(*runs)++ = saved_run;
182  if (*runs >= runend) {
183  av_log(avctx, AV_LOG_ERROR, "uncompressed run overrun\n");
184  return AVERROR_INVALIDDATA;
185  }
186  if (*pix_left <= saved_run) {
187  if (*pix_left == saved_run)
188  return 1;
189  av_log(avctx, AV_LOG_ERROR, "uncompressed run went out of boundsE\n");
190  return AVERROR_INVALIDDATA;
191  }
192  *pix_left -= saved_run;
193  saved_run = 0;
194  *mode = !*mode;
195  if (newmode != *mode) { //FIXME CHECK
196  *(*runs)++ = 0;
197  if (*runs >= runend) {
198  av_log(avctx, AV_LOG_ERROR, "uncompressed run overrun\n");
199  return AVERROR_INVALIDDATA;
200  }
201  *mode = newmode;
202  }
203  return 0;
204 }
205 
206 static int decode_group3_1d_line(AVCodecContext *avctx, GetBitContext *gb,
207  unsigned int pix_left, int *runs,
208  const int *runend)
209 {
210  int mode = 0;
211  unsigned int run = 0;
212  unsigned int t;
213  for (;;) {
214  if (get_bits_left(gb) <= 0)
215  return AVERROR_INVALIDDATA;
216  t = get_vlc2(gb, ccitt_vlc[mode].table, 9, 2);
217  run += t;
218  if (t < 64) {
219  *runs++ = run;
220  if (runs >= runend) {
221  av_log(avctx, AV_LOG_ERROR, "Run overrun\n");
222  return AVERROR_INVALIDDATA;
223  }
224  if (pix_left <= run) {
225  if (pix_left == run)
226  break;
227  av_log(avctx, AV_LOG_ERROR, "Run went out of bounds\n");
228  return AVERROR_INVALIDDATA;
229  }
230  pix_left -= run;
231  run = 0;
232  mode = !mode;
233  } else if ((int)t == -1) {
234  if (get_bits_left(gb) > 12 && show_bits(gb, 12) == 15) {
235  int ret;
236  skip_bits(gb, 12);
237  ret = decode_uncompressed(avctx, gb, &pix_left, &runs, runend, &mode);
238  if (ret < 0) {
239  return ret;
240  } else if (ret)
241  break;
242  } else {
243  av_log(avctx, AV_LOG_ERROR, "Incorrect code\n");
244  return AVERROR_INVALIDDATA;
245  }
246  }
247  }
248  *runs++ = 0;
249  return 0;
250 }
251 
252 static int decode_group3_2d_line(AVCodecContext *avctx, GetBitContext *gb,
253  unsigned int width, int *runs,
254  const int *runend, const int *ref)
255 {
256  int mode = 0, saved_run = 0, t;
257  int run_off = *ref++;
258  unsigned int offs = 0, run = 0;
259 
260  while (offs < width) {
261  int cmode;
262  if (get_bits_left(gb) <= 0)
263  return AVERROR_INVALIDDATA;
264  cmode = get_vlc2(gb, ccitt_group3_2d_vlc.table, 9, 1);
265  if (cmode == -1) {
266  av_log(avctx, AV_LOG_ERROR, "Incorrect mode VLC\n");
267  return AVERROR_INVALIDDATA;
268  }
269  if (!cmode) { //pass mode
270  if (run_off < width)
271  run_off += *ref++;
272  run = run_off - offs;
273  offs = run_off;
274  if (run_off < width)
275  run_off += *ref++;
276  if (offs > width) {
277  av_log(avctx, AV_LOG_ERROR, "Run went out of bounds\n");
278  return AVERROR_INVALIDDATA;
279  }
280  saved_run += run;
281  } else if (cmode == 1) { //horizontal mode
282  int k;
283  for (k = 0; k < 2; k++) {
284  run = 0;
285  for (;;) {
286  if (get_bits_left(gb) <= 0)
287  return AVERROR_INVALIDDATA;
288  t = get_vlc2(gb, ccitt_vlc[mode].table, 9, 2);
289  if (t == -1) {
290  av_log(avctx, AV_LOG_ERROR, "Incorrect code\n");
291  return AVERROR_INVALIDDATA;
292  }
293  run += t;
294  if (t < 64)
295  break;
296  }
297  *runs++ = run + saved_run;
298  if (runs >= runend) {
299  av_log(avctx, AV_LOG_ERROR, "Run overrun\n");
300  return AVERROR_INVALIDDATA;
301  }
302  saved_run = 0;
303  offs += run;
304  if (offs > width || run > width) {
305  av_log(avctx, AV_LOG_ERROR, "Run went out of bounds\n");
306  return AVERROR_INVALIDDATA;
307  }
308  mode = !mode;
309  }
310  } else if (cmode == 9 || cmode == 10) {
311  int xxx;
312  if (get_bits_left(gb) < 3)
313  return AVERROR_INVALIDDATA;
314  xxx = get_bits(gb, 3);
315  if (cmode == 9 && xxx == 7) {
316  int ret;
317  int pix_left = width - offs;
318 
319  if (saved_run) {
320  av_log(avctx, AV_LOG_ERROR, "saved run %d on entering uncompressed mode\n", saved_run);
321  return AVERROR_INVALIDDATA;
322  }
323  ret = decode_uncompressed(avctx, gb, &pix_left, &runs, runend, &mode);
324  offs = width - pix_left;
325  if (ret < 0) {
326  return ret;
327  } else if (ret)
328  break;
329  } else {
330  avpriv_report_missing_feature(avctx, "Special mode %d xxx=%d support", cmode, xxx);
331  return AVERROR_PATCHWELCOME;
332  }
333  } else { //vertical mode
334  run = run_off - offs + (cmode - 5);
335  run_off -= *--ref;
336  offs += run;
337  if (offs > width || run > width) {
338  av_log(avctx, AV_LOG_ERROR, "Run went out of bounds\n");
339  return AVERROR_INVALIDDATA;
340  }
341  *runs++ = run + saved_run;
342  if (runs >= runend) {
343  av_log(avctx, AV_LOG_ERROR, "Run overrun\n");
344  return AVERROR_INVALIDDATA;
345  }
346  saved_run = 0;
347  mode = !mode;
348  }
349  //sync line pointers
350  while (offs < width && run_off <= offs) {
351  run_off += *ref++;
352  run_off += *ref++;
353  }
354  }
355  *runs++ = saved_run;
356  if (saved_run) {
357  if (runs >= runend) {
358  av_log(avctx, AV_LOG_ERROR, "Run overrun\n");
359  return -1;
360  }
361  *runs++ = 0;
362  }
363  return 0;
364 }
365 
366 static void put_line(uint8_t *dst, int size, int width, const int *runs)
367 {
368  PutBitContext pb;
369  int run, mode = ~0, pix_left = width, run_idx = 0;
370 
371  init_put_bits(&pb, dst, size);
372  while (pix_left > 0) {
373  run = runs[run_idx++];
374  mode = ~mode;
375  pix_left -= run;
376  for (; run > 16; run -= 16)
377  put_sbits(&pb, 16, mode);
378  if (run)
379  put_sbits(&pb, run, mode);
380  }
381  flush_put_bits(&pb);
382 }
383 
384 static int find_group3_syncmarker(GetBitContext *gb, int srcsize)
385 {
386  unsigned int state = -1;
387  srcsize -= get_bits_count(gb);
388  while (srcsize-- > 0) {
389  state += state + get_bits1(gb);
390  if ((state & 0xFFF) == 1)
391  return 0;
392  }
393  return -1;
394 }
395 
396 int ff_ccitt_unpack(AVCodecContext *avctx, const uint8_t *src, int srcsize,
397  uint8_t *dst, int height, int stride,
398  enum TiffCompr compr, int opts)
399 {
400  int j;
401  GetBitContext gb;
402  int *runs, *ref = NULL, *runend;
403  int ret;
404  int runsize = avctx->width + 2;
405  int has_eol;
406 
407  runs = av_malloc_array(runsize, sizeof(runs[0]));
408  ref = av_malloc_array(runsize, sizeof(ref[0]));
409  if (!runs || !ref) {
410  ret = AVERROR(ENOMEM);
411  goto fail;
412  }
413  ref[0] = avctx->width;
414  ref[1] = 0;
415  ref[2] = 0;
416  if ((ret = init_get_bits8(&gb, src, srcsize)) < 0)
417  goto fail;
418  has_eol = show_bits(&gb, 12) == 1 || show_bits(&gb, 16) == 1;
419 
420  for (j = 0; j < height; j++) {
421  runend = runs + runsize;
422  if (compr == TIFF_G4) {
423  ret = decode_group3_2d_line(avctx, &gb, avctx->width, runs, runend,
424  ref);
425  if (ret < 0)
426  goto fail;
427  } else {
428  int g3d1 = (compr == TIFF_G3) && !(opts & 1);
429  if (compr != TIFF_CCITT_RLE &&
430  has_eol &&
431  find_group3_syncmarker(&gb, srcsize * 8) < 0)
432  break;
433  if (compr == TIFF_CCITT_RLE || g3d1 || get_bits1(&gb))
434  ret = decode_group3_1d_line(avctx, &gb, avctx->width, runs,
435  runend);
436  else
437  ret = decode_group3_2d_line(avctx, &gb, avctx->width, runs,
438  runend, ref);
439  if (compr == TIFF_CCITT_RLE)
440  align_get_bits(&gb);
441  }
442  if (avctx->err_recognition & AV_EF_EXPLODE && ret < 0)
443  goto fail;
444 
445  if (ret < 0) {
446  put_line(dst, stride, avctx->width, ref);
447  } else {
448  put_line(dst, stride, avctx->width, runs);
449  FFSWAP(int *, runs, ref);
450  }
451  dst += stride;
452  }
453  ret = 0;
454 fail:
455  av_free(runs);
456  av_free(ref);
457  return ret;
458 }
ccitt_group3_2d_bits
static const uint8_t ccitt_group3_2d_bits[11]
Definition: faxcompr.c:90
ccitt_codes_lens
static const uint8_t ccitt_codes_lens[2][CCITT_SYMS]
Definition: faxcompr.c:70
get_bits_left
static int get_bits_left(GetBitContext *gb)
Definition: get_bits.h:850
AVERROR
Filter the word “frame” indicates either a video frame or a group of audio as stored in an AVFrame structure Format for each input and each output the list of supported formats For video that means pixel format For audio that means channel sample they are references to shared objects When the negotiation mechanism computes the intersection of the formats supported at each end of a all references to both lists are replaced with a reference to the intersection And when a single format is eventually chosen for a link amongst the remaining all references to the list are updated That means that if a filter requires that its input and output have the same format amongst a supported all it has to do is use a reference to the same list of formats query_formats can leave some formats unset and return AVERROR(EAGAIN) to cause the negotiation mechanism toagain later. That can be used by filters with complex requirements to use the format negotiated on one link to set the formats supported on another. Frame references ownership and permissions
thread.h
INIT_VLC_STATIC
#define INIT_VLC_STATIC(vlc, bits, a, b, c, d, e, f, g, static_size)
Definition: vlc.h:120
AVCodecContext::err_recognition
int err_recognition
Error recognition; may misdetect some more or less valid parts as errors.
Definition: avcodec.h:1324
put_sbits
static void put_sbits(PutBitContext *pb, int n, int32_t value)
Definition: put_bits.h:280
init_put_bits
static void init_put_bits(PutBitContext *s, uint8_t *buffer, int buffer_size)
Initialize the PutBitContext s.
Definition: put_bits.h:61
get_bits_count
static int get_bits_count(const GetBitContext *s)
Definition: get_bits.h:220
TIFF_CCITT_RLE
@ TIFF_CCITT_RLE
Definition: tiff.h:122
state
static struct @321 state
table
static const uint16_t table[]
Definition: prosumer.c:206
get_vlc2
static av_always_inline int get_vlc2(GetBitContext *s, VLC_TYPE(*table)[2], int bits, int max_depth)
Parse a vlc code.
Definition: get_bits.h:798
find_group3_syncmarker
static int find_group3_syncmarker(GetBitContext *gb, int srcsize)
Definition: faxcompr.c:384
ccitt_codes_bits
static const uint8_t ccitt_codes_bits[2][CCITT_SYMS]
Definition: faxcompr.c:46
skip_bits
static void skip_bits(GetBitContext *s, int n)
Definition: get_bits.h:468
get_bits
static unsigned int get_bits(GetBitContext *s, int n)
Read 1-25 bits.
Definition: get_bits.h:380
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: faxcompr.c:396
VLC_TYPE
#define VLC_TYPE
Definition: vlc.h:24
fail
#define fail()
Definition: checkasm.h:128
GetBitContext
Definition: get_bits.h:62
ff_thread_once
static int ff_thread_once(char *control, void(*routine)(void))
Definition: thread.h:175
AV_LOG_ERROR
#define AV_LOG_ERROR
Something went wrong and cannot losslessly be recovered.
Definition: log.h:180
av_cold
#define av_cold
Definition: attributes.h:90
init_get_bits8
static int init_get_bits8(GetBitContext *s, const uint8_t *buffer, int byte_size)
Initialize GetBitContext.
Definition: get_bits.h:678
width
#define width
TIFF_G4
@ TIFF_G4
Definition: tiff.h:124
get_bits.h
PutBitContext
Definition: put_bits.h:49
ff_ccitt_unpack_init
av_cold void ff_ccitt_unpack_init(void)
initialize unpacker code
Definition: faxcompr.c:122
opts
AVDictionary * opts
Definition: movenc.c:50
AV_ONCE_INIT
#define AV_ONCE_INIT
Definition: thread.h:173
NULL
#define NULL
Definition: coverity.c:32
AVERROR_PATCHWELCOME
#define AVERROR_PATCHWELCOME
Not yet implemented in FFmpeg, patches welcome.
Definition: error.h:64
run
uint8_t run
Definition: svq3.c:201
get_bits1
static unsigned int get_bits1(GetBitContext *s)
Definition: get_bits.h:499
INIT_VLC_USE_NEW_STATIC
#define INIT_VLC_USE_NEW_STATIC
Definition: vlc.h:95
AV_EF_EXPLODE
#define AV_EF_EXPLODE
abort decoding on minor error detection
Definition: avcodec.h:1335
TIFF_G3
@ TIFF_G3
Definition: tiff.h:123
AVOnce
#define AVOnce
Definition: thread.h:172
ff_init_vlc_sparse
int ff_init_vlc_sparse(VLC *vlc, int nb_bits, int nb_codes, const void *bits, int bits_wrap, int bits_size, const void *codes, int codes_wrap, int codes_size, const void *symbols, int symbols_wrap, int symbols_size, int flags)
Definition: bitstream.c:317
ccitt_syms
static const uint16_t ccitt_syms[CCITT_SYMS]
Definition: faxcompr.c:35
ccitt_group3_2d_lens
static const uint8_t ccitt_group3_2d_lens[11]
Definition: faxcompr.c:94
VLC::table_allocated
int table_allocated
Definition: vlc.h:29
size
int size
Definition: twinvq_data.h:10344
avpriv_report_missing_feature
void avpriv_report_missing_feature(void *avc, const char *msg,...) av_printf_format(2
Log a generic warning message about a missing feature.
height
#define height
i
#define i(width, name, range_min, range_max)
Definition: cbs_h2645.c:271
show_bits
static unsigned int show_bits(GetBitContext *s, int n)
Show 1-25 bits.
Definition: get_bits.h:447
av_malloc_array
#define av_malloc_array(a, b)
Definition: tableprint_vlc.h:32
ccitt_unpack_init
static av_cold void ccitt_unpack_init(void)
Definition: faxcompr.c:100
decode_uncompressed
static int decode_uncompressed(AVCodecContext *avctx, GetBitContext *gb, unsigned int *pix_left, int **runs, const int *runend, int *mode)
Definition: faxcompr.c:128
avcodec.h
stride
#define stride
Definition: h264pred_template.c:537
ret
ret
Definition: filter_design.txt:187
ccitt_group3_2d_vlc
static VLC ccitt_group3_2d_vlc
Definition: faxcompr.c:98
FFSWAP
#define FFSWAP(type, a, b)
Definition: macros.h:52
align_get_bits
static const uint8_t * align_get_bits(GetBitContext *s)
Definition: get_bits.h:694
AVCodecContext
main external API structure.
Definition: avcodec.h:383
CCITT_SYMS
#define CCITT_SYMS
Definition: faxcompr.c:33
mode
mode
Definition: ebur128.h:83
VLC
Definition: vlc.h:26
ref
static int ref[MAX_W *MAX_W]
Definition: jpeg2000dwt.c:107
decode_group3_1d_line
static int decode_group3_1d_line(AVCodecContext *avctx, GetBitContext *gb, unsigned int pix_left, int *runs, const int *runend)
Definition: faxcompr.c:206
faxcompr.h
flush_put_bits
static void flush_put_bits(PutBitContext *s)
Pad the end of the output stream with zeros.
Definition: put_bits.h:142
av_free
#define av_free(p)
Definition: tableprint_vlc.h:34
src
INIT_CLIP pixel * src
Definition: h264pred_template.c:418
AVCodecContext::width
int width
picture width / height.
Definition: avcodec.h:556
TiffCompr
TiffCompr
list of TIFF, TIFF/EP and DNG compression types
Definition: tiff.h:120
av_log
#define av_log(a,...)
Definition: tableprint_vlc.h:28
AVERROR_INVALIDDATA
#define AVERROR_INVALIDDATA
Invalid data found when processing input.
Definition: error.h:61
put_bits.h
ccitt_vlc
static VLC ccitt_vlc[2]
Definition: faxcompr.c:98
decode_group3_2d_line
static int decode_group3_2d_line(AVCodecContext *avctx, GetBitContext *gb, unsigned int width, int *runs, const int *runend, const int *ref)
Definition: faxcompr.c:252
VLC::table
VLC_TYPE(* table)[2]
code, bits
Definition: vlc.h:28
av_log2
int av_log2(unsigned v)
Definition: intmath.c:26
put_line
static void put_line(uint8_t *dst, int size, int width, const int *runs)
Definition: faxcompr.c:366
Generated on Fri Jan 21 2022 19:21:21 for FFmpeg by   doxygen 1.8.17