FFmpeg  4.0
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] = 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; (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; (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 
199  /* decode mapped error */
200  map = 0;
201  if (!k && (RItype || ret) && (2 * state->B[Q] < state->N[Q]))
202  map = 1;
203  ret += RItype + map;
204 
205  if (ret & 1) {
206  ret = map - (ret + 1 >> 1);
207  state->B[Q]++;
208  } else {
209  ret = ret >> 1;
210  }
211 
212  if(FFABS(ret) > 0xFFFF)
213  return -0x10000;
214  /* update state */
215  state->A[Q] += FFABS(ret) - RItype;
216  ret *= state->twonear;
217  ff_jpegls_downscale_state(state, Q);
218 
219  return ret;
220 }
221 
222 /**
223  * Decode one line of image
224  */
226  void *last, void *dst, int last2, int w,
227  int stride, int comp, int bits)
228 {
229  int i, x = 0;
230  int Ra, Rb, Rc, Rd;
231  int D0, D1, D2;
232 
233  while (x < w) {
234  int err, pred;
235 
236  if (get_bits_left(&s->gb) <= 0)
237  return;
238 
239  /* compute gradients */
240  Ra = x ? R(dst, x - stride) : R(last, x);
241  Rb = R(last, x);
242  Rc = x ? R(last, x - stride) : last2;
243  Rd = (x >= w - stride) ? R(last, x) : R(last, x + stride);
244  D0 = Rd - Rb;
245  D1 = Rb - Rc;
246  D2 = Rc - Ra;
247  /* run mode */
248  if ((FFABS(D0) <= state->near) &&
249  (FFABS(D1) <= state->near) &&
250  (FFABS(D2) <= state->near)) {
251  int r;
252  int RItype;
253 
254  /* decode full runs while available */
255  while (get_bits1(&s->gb)) {
256  int r;
257  r = 1 << ff_log2_run[state->run_index[comp]];
258  if (x + r * stride > w)
259  r = (w - x) / stride;
260  for (i = 0; i < r; i++) {
261  W(dst, x, Ra);
262  x += stride;
263  }
264  /* if EOL reached, we stop decoding */
265  if (r != 1 << ff_log2_run[state->run_index[comp]])
266  return;
267  if (state->run_index[comp] < 31)
268  state->run_index[comp]++;
269  if (x + stride > w)
270  return;
271  }
272  /* decode aborted run */
273  r = ff_log2_run[state->run_index[comp]];
274  if (r)
275  r = get_bits_long(&s->gb, r);
276  if (x + r * stride > w) {
277  r = (w - x) / stride;
278  }
279  for (i = 0; i < r; i++) {
280  W(dst, x, Ra);
281  x += stride;
282  }
283 
284  if (x >= w) {
285  av_log(NULL, AV_LOG_ERROR, "run overflow\n");
286  av_assert0(x <= w);
287  return;
288  }
289 
290  /* decode run termination value */
291  Rb = R(last, x);
292  RItype = (FFABS(Ra - Rb) <= state->near) ? 1 : 0;
293  err = ls_get_code_runterm(&s->gb, state, RItype,
294  ff_log2_run[state->run_index[comp]]);
295  if (state->run_index[comp])
296  state->run_index[comp]--;
297 
298  if (state->near && RItype) {
299  pred = Ra + err;
300  } else {
301  if (Rb < Ra)
302  pred = Rb - err;
303  else
304  pred = Rb + err;
305  }
306  } else { /* regular mode */
307  int context, sign;
308 
309  context = ff_jpegls_quantize(state, D0) * 81 +
310  ff_jpegls_quantize(state, D1) * 9 +
311  ff_jpegls_quantize(state, D2);
312  pred = mid_pred(Ra, Ra + Rb - Rc, Rb);
313 
314  if (context < 0) {
315  context = -context;
316  sign = 1;
317  } else {
318  sign = 0;
319  }
320 
321  if (sign) {
322  pred = av_clip(pred - state->C[context], 0, state->maxval);
323  err = -ls_get_code_regular(&s->gb, state, context);
324  } else {
325  pred = av_clip(pred + state->C[context], 0, state->maxval);
326  err = ls_get_code_regular(&s->gb, state, context);
327  }
328 
329  /* we have to do something more for near-lossless coding */
330  pred += err;
331  }
332  if (state->near) {
333  if (pred < -state->near)
334  pred += state->range * state->twonear;
335  else if (pred > state->maxval + state->near)
336  pred -= state->range * state->twonear;
337  pred = av_clip(pred, 0, state->maxval);
338  }
339 
340  pred &= state->maxval;
341  W(dst, x, pred);
342  x += stride;
343  }
344 }
345 
347  int point_transform, int ilv)
348 {
349  int i, t = 0;
350  uint8_t *zero, *last, *cur;
351  JLSState *state;
352  int off = 0, stride = 1, width, shift, ret = 0;
353 
354  zero = av_mallocz(s->picture_ptr->linesize[0]);
355  if (!zero)
356  return AVERROR(ENOMEM);
357  last = zero;
358  cur = s->picture_ptr->data[0];
359 
360  state = av_mallocz(sizeof(JLSState));
361  if (!state) {
362  av_free(zero);
363  return AVERROR(ENOMEM);
364  }
365  /* initialize JPEG-LS state from JPEG parameters */
366  state->near = near;
367  state->bpp = (s->bits < 2) ? 2 : s->bits;
368  state->maxval = s->maxval;
369  state->T1 = s->t1;
370  state->T2 = s->t2;
371  state->T3 = s->t3;
372  state->reset = s->reset;
374  ff_jpegls_init_state(state);
375 
376  if (s->bits <= 8)
377  shift = point_transform + (8 - s->bits);
378  else
379  shift = point_transform + (16 - s->bits);
380 
381  if (shift >= 16) {
382  ret = AVERROR_INVALIDDATA;
383  goto end;
384  }
385 
386  if (s->avctx->debug & FF_DEBUG_PICT_INFO) {
388  "JPEG-LS params: %ix%i NEAR=%i MV=%i T(%i,%i,%i) "
389  "RESET=%i, LIMIT=%i, qbpp=%i, RANGE=%i\n",
390  s->width, s->height, state->near, state->maxval,
391  state->T1, state->T2, state->T3,
392  state->reset, state->limit, state->qbpp, state->range);
393  av_log(s->avctx, AV_LOG_DEBUG, "JPEG params: ILV=%i Pt=%i BPP=%i, scan = %i\n",
394  ilv, point_transform, s->bits, s->cur_scan);
395  }
396  if (get_bits_left(&s->gb) < s->height) {
397  ret = AVERROR_INVALIDDATA;
398  goto end;
399  }
400  if (ilv == 0) { /* separate planes */
401  if (s->cur_scan > s->nb_components) {
402  ret = AVERROR_INVALIDDATA;
403  goto end;
404  }
405  stride = (s->nb_components > 1) ? 3 : 1;
406  off = av_clip(s->cur_scan - 1, 0, stride - 1);
407  width = s->width * stride;
408  cur += off;
409  for (i = 0; i < s->height; i++) {
410  if (s->bits <= 8) {
411  ls_decode_line(state, s, last, cur, t, width, stride, off, 8);
412  t = last[0];
413  } else {
414  ls_decode_line(state, s, last, cur, t, width, stride, off, 16);
415  t = *((uint16_t *)last);
416  }
417  last = cur;
418  cur += s->picture_ptr->linesize[0];
419 
420  if (s->restart_interval && !--s->restart_count) {
421  align_get_bits(&s->gb);
422  skip_bits(&s->gb, 16); /* skip RSTn */
423  }
424  }
425  } else if (ilv == 1) { /* line interleaving */
426  int j;
427  int Rc[3] = { 0, 0, 0 };
428  stride = (s->nb_components > 1) ? 3 : 1;
429  memset(cur, 0, s->picture_ptr->linesize[0]);
430  width = s->width * stride;
431  for (i = 0; i < s->height; i++) {
432  for (j = 0; j < stride; j++) {
433  ls_decode_line(state, s, last + j, cur + j,
434  Rc[j], width, stride, j, 8);
435  Rc[j] = last[j];
436 
437  if (s->restart_interval && !--s->restart_count) {
438  align_get_bits(&s->gb);
439  skip_bits(&s->gb, 16); /* skip RSTn */
440  }
441  }
442  last = cur;
443  cur += s->picture_ptr->linesize[0];
444  }
445  } else if (ilv == 2) { /* sample interleaving */
446  avpriv_report_missing_feature(s->avctx, "Sample interleaved images");
447  ret = AVERROR_PATCHWELCOME;
448  goto end;
449  } else { /* unknown interleaving */
450  avpriv_report_missing_feature(s->avctx, "Unknown interleaved images");
451  ret = AVERROR_PATCHWELCOME;
452  goto end;
453  }
454 
455  if (s->xfrm && s->nb_components == 3) {
456  int x, w;
457 
458  w = s->width * s->nb_components;
459 
460  if (s->bits <= 8) {
461  uint8_t *src = s->picture_ptr->data[0];
462 
463  for (i = 0; i < s->height; i++) {
464  switch(s->xfrm) {
465  case 1:
466  for (x = off; x < w; x += 3) {
467  src[x ] += src[x+1] + 128;
468  src[x+2] += src[x+1] + 128;
469  }
470  break;
471  case 2:
472  for (x = off; x < w; x += 3) {
473  src[x ] += src[x+1] + 128;
474  src[x+2] += ((src[x ] + src[x+1])>>1) + 128;
475  }
476  break;
477  case 3:
478  for (x = off; x < w; x += 3) {
479  int g = src[x+0] - ((src[x+2]+src[x+1])>>2) + 64;
480  src[x+0] = src[x+2] + g + 128;
481  src[x+2] = src[x+1] + g + 128;
482  src[x+1] = g;
483  }
484  break;
485  case 4:
486  for (x = off; x < w; x += 3) {
487  int r = src[x+0] - (( 359 * (src[x+2]-128) + 490) >> 8);
488  int g = src[x+0] - (( 88 * (src[x+1]-128) - 183 * (src[x+2]-128) + 30) >> 8);
489  int b = src[x+0] + ((454 * (src[x+1]-128) + 574) >> 8);
490  src[x+0] = av_clip_uint8(r);
491  src[x+1] = av_clip_uint8(g);
492  src[x+2] = av_clip_uint8(b);
493  }
494  break;
495  }
496  src += s->picture_ptr->linesize[0];
497  }
498  }else
499  avpriv_report_missing_feature(s->avctx, "16bit xfrm");
500  }
501 
502  if (shift) { /* we need to do point transform or normalize samples */
503  int x, w;
504 
505  w = s->width * s->nb_components;
506 
507  if (s->bits <= 8) {
508  uint8_t *src = s->picture_ptr->data[0];
509 
510  for (i = 0; i < s->height; i++) {
511  for (x = off; x < w; x += stride)
512  src[x] <<= shift;
513  src += s->picture_ptr->linesize[0];
514  }
515  } else {
516  uint16_t *src = (uint16_t *)s->picture_ptr->data[0];
517 
518  for (i = 0; i < s->height; i++) {
519  for (x = 0; x < w; x++)
520  src[x] <<= shift;
521  src += s->picture_ptr->linesize[0] / 2;
522  }
523  }
524  }
525 
526 end:
527  av_free(state);
528  av_free(zero);
529 
530  return ret;
531 }
532 
534  .name = "jpegls",
535  .long_name = NULL_IF_CONFIG_SMALL("JPEG-LS"),
536  .type = AVMEDIA_TYPE_VIDEO,
537  .id = AV_CODEC_ID_JPEGLS,
538  .priv_data_size = sizeof(MJpegDecodeContext),
540  .close = ff_mjpeg_decode_end,
542  .capabilities = AV_CODEC_CAP_DR1,
543  .caps_internal = FF_CODEC_CAP_INIT_THREADSAFE,
544 };
static unsigned int show_bits_long(GetBitContext *s, int n)
Show 0-32 bits.
Definition: get_bits.h:405
int reset
Definition: jpegls.h:44
#define NULL
Definition: coverity.c:32
const uint8_t ff_log2_run[41]
Definition: bitstream.c:39
const char * s
Definition: avisynth_c.h:768
#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:269
else temp
Definition: vf_mcdeint.c:256
const char * g
Definition: vf_curves.c:112
static av_cold int init(AVCodecContext *avctx)
Definition: avrndec.c:35
const char * b
Definition: vf_curves.c:113
int C[365]
Definition: jpegls.h:43
enum AVPixelFormat pix_fmt
Pixel format, see AV_PIX_FMT_xxx.
Definition: avcodec.h:1727
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:305
int bits_per_raw_sample
Bits per sample/pixel of internal libavcodec pixel/sample format.
Definition: avcodec.h:2741
int limit
Definition: jpegls.h:44
#define src
Definition: vp8dsp.c:254
int stride
Definition: mace.c:144
AVCodec.
Definition: avcodec.h:3408
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
void void avpriv_request_sample(void *avc, const char *msg,...) av_printf_format(2
Log a generic warning message about a missing feature.
#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:73
#define FF_DEBUG_PICT_INFO
Definition: avcodec.h:2599
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:596
int ff_mjpeg_decode_frame(AVCodecContext *avctx, void *data, int *got_frame, AVPacket *avpkt)
Definition: mjpegdec.c:2236
#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:2715
#define NULL_IF_CONFIG_SMALL(x)
Return NULL if CONFIG_SMALL is true, otherwise the argument without modification. ...
Definition: internal.h:186
const char * r
Definition: vf_curves.c:111
#define AV_LOG_DEBUG
Stuff which is only useful for libav* developers.
Definition: log.h:197
#define zero
Definition: regdef.h:64
uint16_t width
Definition: gdv.c:47
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:3415
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
#define FFMIN(a, b)
Definition: common.h:96
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
static struct @271 state
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:291
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:225
int linesize[AV_NUM_DATA_POINTERS]
For video, size in bytes of each picture line.
Definition: frame.h:249
int debug
debug
Definition: avcodec.h:2598
int A[367]
Definition: jpegls.h:43
static unsigned int get_bits1(GetBitContext *s)
Definition: get_bits.h:321
int ff_jpegls_decode_picture(MJpegDecodeContext *s, int near, int point_transform, int ilv)
Definition: jpeglsdec.c:346
static void skip_bits(GetBitContext *s, int n)
Definition: get_bits.h:314
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:533
static unsigned int get_bits_long(GetBitContext *s, int n)
Read 0-32 bits.
Definition: get_bits.h:354
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:232
av_cold int ff_mjpeg_decode_init(AVCodecContext *avctx)
Definition: mjpegdec.c:127
Y , 8bpp.
Definition: pixfmt.h:70
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:472
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:959
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