FFmpeg  4.1.11
jpeglsdec.c
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1 /*
2  * JPEG-LS decoder
3  * Copyright (c) 2003 Michael Niedermayer
4  * Copyright (c) 2006 Konstantin Shishkov
5  *
6  * This file is part of FFmpeg.
7  *
8  * FFmpeg is free software; you can redistribute it and/or
9  * modify it under the terms of the GNU Lesser General Public
10  * License as published by the Free Software Foundation; either
11  * version 2.1 of the License, or (at your option) any later version.
12  *
13  * FFmpeg is distributed in the hope that it will be useful,
14  * but WITHOUT ANY WARRANTY; without even the implied warranty of
15  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
16  * Lesser General Public License for more details.
17  *
18  * You should have received a copy of the GNU Lesser General Public
19  * License along with FFmpeg; if not, write to the Free Software
20  * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
21  */
22 
23 /**
24  * @file
25  * JPEG-LS decoder.
26  */
27 
28 #include "avcodec.h"
29 #include "get_bits.h"
30 #include "golomb.h"
31 #include "internal.h"
32 #include "mathops.h"
33 #include "mjpeg.h"
34 #include "mjpegdec.h"
35 #include "jpegls.h"
36 #include "jpeglsdec.h"
37 
38 /*
39  * Uncomment this to significantly speed up decoding of broken JPEG-LS
40  * (or test broken JPEG-LS decoder) and slow down ordinary decoding a bit.
41  *
42  * There is no Golomb code with length >= 32 bits possible, so check and
43  * avoid situation of 32 zeros, FFmpeg Golomb decoder is painfully slow
44  * on this errors.
45  */
46 //#define JLS_BROKEN
47 
48 /**
49  * Decode LSE block with initialization parameters
50  */
52 {
53  int id;
54  int tid, wt, maxtab, i, j;
55 
56  int len = get_bits(&s->gb, 16);
57  id = get_bits(&s->gb, 8);
58 
59  switch (id) {
60  case 1:
61  if (len < 13)
62  return AVERROR_INVALIDDATA;
63 
64  s->maxval = get_bits(&s->gb, 16);
65  s->t1 = get_bits(&s->gb, 16);
66  s->t2 = get_bits(&s->gb, 16);
67  s->t3 = get_bits(&s->gb, 16);
68  s->reset = get_bits(&s->gb, 16);
69 
70  if (s->avctx->debug & FF_DEBUG_PICT_INFO) {
71  av_log(s->avctx, AV_LOG_DEBUG, "Coding parameters maxval:%d T1:%d T2:%d T3:%d reset:%d\n",
72  s->maxval, s->t1, s->t2, s->t3, s->reset);
73  }
74 
75 // ff_jpegls_reset_coding_parameters(s, 0);
76  //FIXME quant table?
77  break;
78  case 2:
79  s->palette_index = 0;
80  case 3:
81  tid= get_bits(&s->gb, 8);
82  wt = get_bits(&s->gb, 8);
83 
84  if (len < 5)
85  return AVERROR_INVALIDDATA;
86 
87  if (wt < 1 || wt > MAX_COMPONENTS) {
88  avpriv_request_sample(s->avctx, "wt %d", wt);
89  return AVERROR_PATCHWELCOME;
90  }
91 
92  if (!s->maxval)
93  maxtab = 255;
94  else if ((5 + wt*(s->maxval+1)) < 65535)
95  maxtab = s->maxval;
96  else
97  maxtab = 65530/wt - 1;
98 
99  if (s->avctx->debug & FF_DEBUG_PICT_INFO) {
100  av_log(s->avctx, AV_LOG_DEBUG, "LSE palette %d tid:%d wt:%d maxtab:%d\n", id, tid, wt, maxtab);
101  }
102  if (maxtab >= 256) {
103  avpriv_request_sample(s->avctx, ">8bit palette");
104  return AVERROR_PATCHWELCOME;
105  }
106  maxtab = FFMIN(maxtab, (len - 5) / wt + s->palette_index);
107 
108  if (s->palette_index > maxtab)
109  return AVERROR_INVALIDDATA;
110 
111  if ((s->avctx->pix_fmt == AV_PIX_FMT_GRAY8 || s->avctx->pix_fmt == AV_PIX_FMT_PAL8) &&
113  uint32_t *pal = (uint32_t *)s->picture_ptr->data[1];
114  int shift = 0;
115 
116  if (s->avctx->bits_per_raw_sample > 0 && s->avctx->bits_per_raw_sample < 8) {
117  maxtab = FFMIN(maxtab, (1<<s->avctx->bits_per_raw_sample)-1);
118  shift = 8 - s->avctx->bits_per_raw_sample;
119  }
120 
121  s->picture_ptr->format =
123  for (i=s->palette_index; i<=maxtab; i++) {
124  uint8_t k = i << shift;
125  pal[k] = wt < 4 ? 0xFF000000 : 0;
126  for (j=0; j<wt; j++) {
127  pal[k] |= get_bits(&s->gb, 8) << (8*(wt-j-1));
128  }
129  }
130  s->palette_index = i;
131  }
132  break;
133  case 4:
134  avpriv_request_sample(s->avctx, "oversize image");
135  return AVERROR(ENOSYS);
136  default:
137  av_log(s->avctx, AV_LOG_ERROR, "invalid id %d\n", id);
138  return AVERROR_INVALIDDATA;
139  }
140  ff_dlog(s->avctx, "ID=%i, T=%i,%i,%i\n", id, s->t1, s->t2, s->t3);
141 
142  return 0;
143 }
144 
145 /**
146  * Get context-dependent Golomb code, decode it and update context
147  */
148 static inline int ls_get_code_regular(GetBitContext *gb, JLSState *state, int Q)
149 {
150  int k, ret;
151 
152  for (k = 0; ((unsigned)state->N[Q] << k) < state->A[Q]; k++)
153  ;
154 
155 #ifdef JLS_BROKEN
156  if (!show_bits_long(gb, 32))
157  return -1;
158 #endif
159  ret = get_ur_golomb_jpegls(gb, k, state->limit, state->qbpp);
160 
161  /* decode mapped error */
162  if (ret & 1)
163  ret = -(ret + 1 >> 1);
164  else
165  ret >>= 1;
166 
167  /* for NEAR=0, k=0 and 2*B[Q] <= - N[Q] mapping is reversed */
168  if (!state->near && !k && (2 * state->B[Q] <= -state->N[Q]))
169  ret = -(ret + 1);
170 
171  ret = ff_jpegls_update_state_regular(state, Q, ret);
172 
173  return ret;
174 }
175 
176 /**
177  * Get Golomb code, decode it and update state for run termination
178  */
180  int RItype, int limit_add)
181 {
182  int k, ret, temp, map;
183  int Q = 365 + RItype;
184 
185  temp = state->A[Q];
186  if (RItype)
187  temp += state->N[Q] >> 1;
188 
189  for (k = 0; ((unsigned)state->N[Q] << k) < temp; k++)
190  ;
191 
192 #ifdef JLS_BROKEN
193  if (!show_bits_long(gb, 32))
194  return -1;
195 #endif
196  ret = get_ur_golomb_jpegls(gb, k, state->limit - limit_add - 1,
197  state->qbpp);
198  if (ret < 0)
199  return -0x10000;
200 
201  /* decode mapped error */
202  map = 0;
203  if (!k && (RItype || ret) && (2 * state->B[Q] < state->N[Q]))
204  map = 1;
205  ret += RItype + map;
206 
207  if (ret & 1) {
208  ret = map - (ret + 1 >> 1);
209  state->B[Q]++;
210  } else {
211  ret = ret >> 1;
212  }
213 
214  if (FFABS(ret) > 0xFFFF)
215  return -0x10000;
216  /* update state */
217  state->A[Q] += FFABS(ret) - RItype;
218  ret *= state->twonear;
219  ff_jpegls_downscale_state(state, Q);
220 
221  return ret;
222 }
223 
224 /**
225  * Decode one line of image
226  */
228  void *last, void *dst, int last2, int w,
229  int stride, int comp, int bits)
230 {
231  int i, x = 0;
232  int Ra, Rb, Rc, Rd;
233  int D0, D1, D2;
234 
235  while (x < w) {
236  int err, pred;
237 
238  if (get_bits_left(&s->gb) <= 0)
239  return;
240 
241  /* compute gradients */
242  Ra = x ? R(dst, x - stride) : R(last, x);
243  Rb = R(last, x);
244  Rc = x ? R(last, x - stride) : last2;
245  Rd = (x >= w - stride) ? R(last, x) : R(last, x + stride);
246  D0 = Rd - Rb;
247  D1 = Rb - Rc;
248  D2 = Rc - Ra;
249  /* run mode */
250  if ((FFABS(D0) <= state->near) &&
251  (FFABS(D1) <= state->near) &&
252  (FFABS(D2) <= state->near)) {
253  int r;
254  int RItype;
255 
256  /* decode full runs while available */
257  while (get_bits1(&s->gb)) {
258  int r;
259  r = 1 << ff_log2_run[state->run_index[comp]];
260  if (x + r * stride > w)
261  r = (w - x) / stride;
262  for (i = 0; i < r; i++) {
263  W(dst, x, Ra);
264  x += stride;
265  }
266  /* if EOL reached, we stop decoding */
267  if (r != 1 << ff_log2_run[state->run_index[comp]])
268  return;
269  if (state->run_index[comp] < 31)
270  state->run_index[comp]++;
271  if (x + stride > w)
272  return;
273  }
274  /* decode aborted run */
275  r = ff_log2_run[state->run_index[comp]];
276  if (r)
277  r = get_bits_long(&s->gb, r);
278  if (x + r * stride > w) {
279  r = (w - x) / stride;
280  }
281  for (i = 0; i < r; i++) {
282  W(dst, x, Ra);
283  x += stride;
284  }
285 
286  if (x >= w) {
287  av_log(NULL, AV_LOG_ERROR, "run overflow\n");
288  av_assert0(x <= w);
289  return;
290  }
291 
292  /* decode run termination value */
293  Rb = R(last, x);
294  RItype = (FFABS(Ra - Rb) <= state->near) ? 1 : 0;
295  err = ls_get_code_runterm(&s->gb, state, RItype,
296  ff_log2_run[state->run_index[comp]]);
297  if (state->run_index[comp])
298  state->run_index[comp]--;
299 
300  if (state->near && RItype) {
301  pred = Ra + err;
302  } else {
303  if (Rb < Ra)
304  pred = Rb - err;
305  else
306  pred = Rb + err;
307  }
308  } else { /* regular mode */
309  int context, sign;
310 
311  context = ff_jpegls_quantize(state, D0) * 81 +
312  ff_jpegls_quantize(state, D1) * 9 +
313  ff_jpegls_quantize(state, D2);
314  pred = mid_pred(Ra, Ra + Rb - Rc, Rb);
315 
316  if (context < 0) {
317  context = -context;
318  sign = 1;
319  } else {
320  sign = 0;
321  }
322 
323  if (sign) {
324  pred = av_clip(pred - state->C[context], 0, state->maxval);
325  err = -ls_get_code_regular(&s->gb, state, context);
326  } else {
327  pred = av_clip(pred + state->C[context], 0, state->maxval);
328  err = ls_get_code_regular(&s->gb, state, context);
329  }
330 
331  /* we have to do something more for near-lossless coding */
332  pred += err;
333  }
334  if (state->near) {
335  if (pred < -state->near)
336  pred += state->range * state->twonear;
337  else if (pred > state->maxval + state->near)
338  pred -= state->range * state->twonear;
339  pred = av_clip(pred, 0, state->maxval);
340  }
341 
342  pred &= state->maxval;
343  W(dst, x, pred);
344  x += stride;
345  }
346 }
347 
349  int point_transform, int ilv)
350 {
351  int i, t = 0;
352  uint8_t *zero, *last, *cur;
353  JLSState *state;
354  int off = 0, stride = 1, width, shift, ret = 0;
355 
356  zero = av_mallocz(s->picture_ptr->linesize[0]);
357  if (!zero)
358  return AVERROR(ENOMEM);
359  last = zero;
360  cur = s->picture_ptr->data[0];
361 
362  state = av_mallocz(sizeof(JLSState));
363  if (!state) {
364  av_free(zero);
365  return AVERROR(ENOMEM);
366  }
367  /* initialize JPEG-LS state from JPEG parameters */
368  state->near = near;
369  state->bpp = (s->bits < 2) ? 2 : s->bits;
370  state->maxval = s->maxval;
371  state->T1 = s->t1;
372  state->T2 = s->t2;
373  state->T3 = s->t3;
374  state->reset = s->reset;
376  ff_jpegls_init_state(state);
377 
378  if (s->bits <= 8)
379  shift = point_transform + (8 - s->bits);
380  else
381  shift = point_transform + (16 - s->bits);
382 
383  if (shift >= 16) {
384  ret = AVERROR_INVALIDDATA;
385  goto end;
386  }
387 
388  if (s->avctx->debug & FF_DEBUG_PICT_INFO) {
390  "JPEG-LS params: %ix%i NEAR=%i MV=%i T(%i,%i,%i) "
391  "RESET=%i, LIMIT=%i, qbpp=%i, RANGE=%i\n",
392  s->width, s->height, state->near, state->maxval,
393  state->T1, state->T2, state->T3,
394  state->reset, state->limit, state->qbpp, state->range);
395  av_log(s->avctx, AV_LOG_DEBUG, "JPEG params: ILV=%i Pt=%i BPP=%i, scan = %i\n",
396  ilv, point_transform, s->bits, s->cur_scan);
397  }
398  if (get_bits_left(&s->gb) < s->height) {
399  ret = AVERROR_INVALIDDATA;
400  goto end;
401  }
402  if (ilv == 0) { /* separate planes */
403  if (s->cur_scan > s->nb_components) {
404  ret = AVERROR_INVALIDDATA;
405  goto end;
406  }
407  stride = (s->nb_components > 1) ? 3 : 1;
408  off = av_clip(s->cur_scan - 1, 0, stride - 1);
409  width = s->width * stride;
410  cur += off;
411  for (i = 0; i < s->height; i++) {
412  if (s->bits <= 8) {
413  ls_decode_line(state, s, last, cur, t, width, stride, off, 8);
414  t = last[0];
415  } else {
416  ls_decode_line(state, s, last, cur, t, width, stride, off, 16);
417  t = *((uint16_t *)last);
418  }
419  last = cur;
420  cur += s->picture_ptr->linesize[0];
421 
422  if (s->restart_interval && !--s->restart_count) {
423  align_get_bits(&s->gb);
424  skip_bits(&s->gb, 16); /* skip RSTn */
425  }
426  }
427  } else if (ilv == 1) { /* line interleaving */
428  int j;
429  int Rc[3] = { 0, 0, 0 };
430  stride = (s->nb_components > 1) ? 3 : 1;
431  memset(cur, 0, s->picture_ptr->linesize[0]);
432  width = s->width * stride;
433  for (i = 0; i < s->height; i++) {
434  for (j = 0; j < stride; j++) {
435  ls_decode_line(state, s, last + j, cur + j,
436  Rc[j], width, stride, j, 8);
437  Rc[j] = last[j];
438 
439  if (s->restart_interval && !--s->restart_count) {
440  align_get_bits(&s->gb);
441  skip_bits(&s->gb, 16); /* skip RSTn */
442  }
443  }
444  last = cur;
445  cur += s->picture_ptr->linesize[0];
446  }
447  } else if (ilv == 2) { /* sample interleaving */
448  avpriv_report_missing_feature(s->avctx, "Sample interleaved images");
449  ret = AVERROR_PATCHWELCOME;
450  goto end;
451  } else { /* unknown interleaving */
452  avpriv_report_missing_feature(s->avctx, "Unknown interleaved images");
453  ret = AVERROR_PATCHWELCOME;
454  goto end;
455  }
456 
457  if (s->xfrm && s->nb_components == 3) {
458  int x, w;
459 
460  w = s->width * s->nb_components;
461 
462  if (s->bits <= 8) {
463  uint8_t *src = s->picture_ptr->data[0];
464 
465  for (i = 0; i < s->height; i++) {
466  switch(s->xfrm) {
467  case 1:
468  for (x = off; x + 2 < w; x += 3) {
469  src[x ] += src[x+1] + 128;
470  src[x+2] += src[x+1] + 128;
471  }
472  break;
473  case 2:
474  for (x = off; x + 2 < w; x += 3) {
475  src[x ] += src[x+1] + 128;
476  src[x+2] += ((src[x ] + src[x+1])>>1) + 128;
477  }
478  break;
479  case 3:
480  for (x = off; x + 2 < w; x += 3) {
481  int g = src[x+0] - ((src[x+2]+src[x+1])>>2) + 64;
482  src[x+0] = src[x+2] + g + 128;
483  src[x+2] = src[x+1] + g + 128;
484  src[x+1] = g;
485  }
486  break;
487  case 4:
488  for (x = off; x + 2 < w; x += 3) {
489  int r = src[x+0] - (( 359 * (src[x+2]-128) + 490) >> 8);
490  int g = src[x+0] - (( 88 * (src[x+1]-128) - 183 * (src[x+2]-128) + 30) >> 8);
491  int b = src[x+0] + ((454 * (src[x+1]-128) + 574) >> 8);
492  src[x+0] = av_clip_uint8(r);
493  src[x+1] = av_clip_uint8(g);
494  src[x+2] = av_clip_uint8(b);
495  }
496  break;
497  }
498  src += s->picture_ptr->linesize[0];
499  }
500  }else
501  avpriv_report_missing_feature(s->avctx, "16bit xfrm");
502  }
503 
504  if (shift) { /* we need to do point transform or normalize samples */
505  int x, w;
506 
507  w = s->width * s->nb_components;
508 
509  if (s->bits <= 8) {
510  uint8_t *src = s->picture_ptr->data[0];
511 
512  for (i = 0; i < s->height; i++) {
513  for (x = off; x < w; x += stride)
514  src[x] <<= shift;
515  src += s->picture_ptr->linesize[0];
516  }
517  } else {
518  uint16_t *src = (uint16_t *)s->picture_ptr->data[0];
519 
520  for (i = 0; i < s->height; i++) {
521  for (x = 0; x < w; x++)
522  src[x] <<= shift;
523  src += s->picture_ptr->linesize[0] / 2;
524  }
525  }
526  }
527 
528 end:
529  av_free(state);
530  av_free(zero);
531 
532  return ret;
533 }
534 
536  .name = "jpegls",
537  .long_name = NULL_IF_CONFIG_SMALL("JPEG-LS"),
538  .type = AVMEDIA_TYPE_VIDEO,
539  .id = AV_CODEC_ID_JPEGLS,
540  .priv_data_size = sizeof(MJpegDecodeContext),
542  .close = ff_mjpeg_decode_end,
544  .capabilities = AV_CODEC_CAP_DR1,
545  .caps_internal = FF_CODEC_CAP_INIT_THREADSAFE,
546 };
static unsigned int show_bits_long(GetBitContext *s, int n)
Show 0-32 bits.
Definition: get_bits.h:587
int reset
Definition: jpegls.h:44
#define NULL
Definition: coverity.c:32
const uint8_t ff_log2_run[41]
Definition: bitstream.c:39
#define AVERROR_INVALIDDATA
Invalid data found when processing input.
Definition: error.h:59
int T2
Definition: jpegls.h:42
static int shift(int a, int b)
Definition: sonic.c:82
static unsigned int get_bits(GetBitContext *s, int n)
Read 1-25 bits.
Definition: get_bits.h:381
else temp
Definition: vf_mcdeint.c:256
const char * g
Definition: vf_curves.c:115
static av_cold int init(AVCodecContext *avctx)
Definition: avrndec.c:35
#define avpriv_request_sample(...)
const char * b
Definition: vf_curves.c:116
int C[365]
Definition: jpegls.h:43
enum AVPixelFormat pix_fmt
Pixel format, see AV_PIX_FMT_xxx.
Definition: avcodec.h:1743
int twonear
Definition: jpegls.h:45
static int get_ur_golomb_jpegls(GetBitContext *gb, int k, int limit, int esc_len)
read unsigned golomb rice code (jpegls).
Definition: golomb.h:428
int bits_per_raw_sample
Bits per sample/pixel of internal libavcodec pixel/sample format.
Definition: avcodec.h:2757
int limit
Definition: jpegls.h:44
#define src
Definition: vp8dsp.c:254
int stride
Definition: mace.c:144
AVCodec.
Definition: avcodec.h:3424
JPEG-LS decoder.
MJPEG encoder and decoder.
static void decode(AVCodecContext *dec_ctx, AVPacket *pkt, AVFrame *frame, FILE *outfile)
Definition: decode_audio.c:42
int bpp
Definition: jpegls.h:44
#define av_assert0(cond)
assert() equivalent, that is always enabled.
Definition: avassert.h:37
int maxval
Definition: jpegls.h:44
#define FF_CODEC_CAP_INIT_THREADSAFE
The codec does not modify any global variables in the init function, allowing to call the init functi...
Definition: internal.h:40
uint8_t
8 bits with AV_PIX_FMT_RGB32 palette
Definition: pixfmt.h:77
#define FF_DEBUG_PICT_INFO
Definition: avcodec.h:2615
static av_cold int end(AVCodecContext *avctx)
Definition: avrndec.c:90
AVFrame * picture_ptr
Definition: mjpegdec.h:100
#define MAX_COMPONENTS
Definition: mjpegdec.h:44
#define ff_dlog(a,...)
bitstream reader API header.
#define av_log(a,...)
static int get_bits_left(GetBitContext *gb)
Definition: get_bits.h:814
int ff_mjpeg_decode_frame(AVCodecContext *avctx, void *data, int *got_frame, AVPacket *avpkt)
Definition: mjpegdec.c:2253
#define i(width, name, range_min, range_max)
Definition: cbs_h2645.c:258
#define AV_LOG_ERROR
Something went wrong and cannot losslessly be recovered.
Definition: log.h:176
#define R
Definition: huffyuvdsp.h:34
#define AVERROR(e)
Definition: error.h:43
av_cold int ff_mjpeg_decode_end(AVCodecContext *avctx)
Definition: mjpegdec.c:2732
#define NULL_IF_CONFIG_SMALL(x)
Return NULL if CONFIG_SMALL is true, otherwise the argument without modification. ...
Definition: internal.h:188
const char * r
Definition: vf_curves.c:114
#define AV_LOG_DEBUG
Stuff which is only useful for libav* developers.
Definition: log.h:197
#define zero
Definition: regdef.h:64
void ff_jpegls_reset_coding_parameters(JLSState *s, int reset_all)
Calculate JPEG-LS codec values.
Definition: jpegls.c:62
void * av_mallocz(size_t size)
Allocate a memory block with alignment suitable for all memory accesses (including vectors if availab...
Definition: mem.c:236
const char * name
Name of the codec implementation.
Definition: avcodec.h:3431
static int ff_jpegls_update_state_regular(JLSState *state, int Q, int err)
Definition: jpegls.h:99
int B[367]
Definition: jpegls.h:43
int ff_jpegls_decode_lse(MJpegDecodeContext *s)
Decode LSE block with initialization parameters.
Definition: jpeglsdec.c:51
int near
Definition: jpegls.h:45
static struct @303 state
#define FFMIN(a, b)
Definition: common.h:96
#define width
uint8_t w
Definition: llviddspenc.c:38
#define FFABS(a)
Absolute value, Note, INT_MIN / INT64_MIN result in undefined behavior as they are not representable ...
Definition: common.h:72
#define s(width, name)
Definition: cbs_vp9.c:257
GetBitContext gb
Definition: mjpegdec.h:49
if(ret< 0)
Definition: vf_mcdeint.c:279
static const float pred[4]
Definition: siprdata.h:259
int qbpp
Definition: jpegls.h:44
static void comp(unsigned char *dst, ptrdiff_t dst_stride, unsigned char *src, ptrdiff_t src_stride, int add)
Definition: eamad.c:83
#define AVERROR_PATCHWELCOME
Not yet implemented in FFmpeg, patches welcome.
Definition: error.h:62
int format
format of the frame, -1 if unknown or unset Values correspond to enum AVPixelFormat for video frames...
Definition: frame.h:299
Libavcodec external API header.
static void ls_decode_line(JLSState *state, MJpegDecodeContext *s, void *last, void *dst, int last2, int w, int stride, int comp, int bits)
Decode one line of image.
Definition: jpeglsdec.c:227
int linesize[AV_NUM_DATA_POINTERS]
For video, size in bytes of each picture line.
Definition: frame.h:257
int debug
debug
Definition: avcodec.h:2614
int A[367]
Definition: jpegls.h:43
static unsigned int get_bits1(GetBitContext *s)
Definition: get_bits.h:487
int ff_jpegls_decode_picture(MJpegDecodeContext *s, int near, int point_transform, int ilv)
Definition: jpeglsdec.c:348
static void skip_bits(GetBitContext *s, int n)
Definition: get_bits.h:460
static int ls_get_code_regular(GetBitContext *gb, JLSState *state, int Q)
Get context-dependent Golomb code, decode it and update context.
Definition: jpeglsdec.c:148
#define W(a, i, v)
Definition: jpegls.h:124
JPEG-LS common code.
int T1
Definition: jpegls.h:42
int range
Definition: jpegls.h:44
int N[367]
Definition: jpegls.h:43
#define mid_pred
Definition: mathops.h:97
int reset
context halfing interval ?rename
Definition: mjpegdec.h:80
const VDPAUPixFmtMap * map
AVCodec ff_jpegls_decoder
Definition: jpeglsdec.c:535
static unsigned int get_bits_long(GetBitContext *s, int n)
Read 0-32 bits.
Definition: get_bits.h:531
void avpriv_report_missing_feature(void *avc, const char *msg,...) av_printf_format(2
Log a generic warning message about a missing feature.
uint8_t * data[AV_NUM_DATA_POINTERS]
pointer to the picture/channel planes.
Definition: frame.h:240
av_cold int ff_mjpeg_decode_init(AVCodecContext *avctx)
Definition: mjpegdec.c:127
Y , 8bpp.
Definition: pixfmt.h:74
common internal api header.
static int ls_get_code_runterm(GetBitContext *gb, JLSState *state, int RItype, int limit_add)
Get Golomb code, decode it and update state for run termination.
Definition: jpeglsdec.c:179
AVCodecContext * avctx
Definition: mjpegdec.h:48
#define av_free(p)
static int ff_jpegls_quantize(JLSState *s, int v)
Calculate quantized gradient value, used for context determination.
Definition: jpegls.h:57
int len
static const uint8_t * align_get_bits(GetBitContext *s)
Definition: get_bits.h:658
int T3
Definition: jpegls.h:42
void ff_jpegls_init_state(JLSState *state)
Calculate initial JPEG-LS parameters.
Definition: jpegls.c:31
MJPEG decoder.
exp golomb vlc stuff
enum AVCodecID id
#define AV_CODEC_CAP_DR1
Codec uses get_buffer() for allocating buffers and supports custom allocators.
Definition: avcodec.h:968
for(j=16;j >0;--j)
int run_index[4]
Definition: jpegls.h:46
static void ff_jpegls_downscale_state(JLSState *state, int Q)
Definition: jpegls.h:89