ffmpeg/libavcodec/jpeglsdec.c

   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 "mathops.h"
  32 #include "mjpeg.h"
  33 #include "mjpegdec.h"
  34 #include "jpegls.h"
  35 #include "jpeglsdec.h"
  36
  37 /*
  38  * Uncomment this to significantly speed up decoding of broken JPEG-LS
  39  * (or test broken JPEG-LS decoder) and slow down ordinary decoding a bit.
  40  *
  41  * There is no Golomb code with length >= 32 bits possible, so check and
  42  * avoid situation of 32 zeros, FFmpeg Golomb decoder is painfully slow
  43  * on this errors.
  44  */
  45 //#define JLS_BROKEN
  46
  47 /**
  48  * Decode LSE block with initialization parameters
  49  */
  50 int ff_jpegls_decode_lse(MJpegDecodeContext *s)
  51 {
  52     int id;
  53     int tid, wt, maxtab, i, j;
  54
  55     int len = get_bits(&s->gb, 16);
  56     id = get_bits(&s->gb, 8);
  57
  58     switch (id) {
  59     case 1:
  60         if (len < 13)
  61             return AVERROR_INVALIDDATA;
  62
  63         s->maxval = get_bits(&s->gb, 16);
  64         s->t1     = get_bits(&s->gb, 16);
  65         s->t2     = get_bits(&s->gb, 16);
  66         s->t3     = get_bits(&s->gb, 16);
  67         s->reset  = get_bits(&s->gb, 16);
  68
  69         if(s->avctx->debug & FF_DEBUG_PICT_INFO) {
  70             av_log(s->avctx, AV_LOG_DEBUG, "Coding parameters maxval:%d T1:%d T2:%d T3:%d reset:%d\n",
  71                    s->maxval, s->t1, s->t2, s->t3, s->reset);
  72         }
  73
  74 //        ff_jpegls_reset_coding_parameters(s, 0);
  75         //FIXME quant table?
  76         break;
  77     case 2:
  78         s->palette_index = 0;
  79     case 3:
  80         tid= get_bits(&s->gb, 8);
  81         wt = get_bits(&s->gb, 8);
  82
  83         if (len < 5)
  84             return AVERROR_INVALIDDATA;
  85
  86         if (wt < 1 || wt > MAX_COMPONENTS) {
  87             avpriv_request_sample(s->avctx, "wt %d", wt);
  88             return AVERROR_PATCHWELCOME;
  89         }
  90
  91         if (!s->maxval)
  92             maxtab = 255;
  93         else if ((5 + wt*(s->maxval+1)) < 65535)
  94             maxtab = s->maxval;
  95         else
  96             maxtab = 65530/wt - 1;
  97
  98         if(s->avctx->debug & FF_DEBUG_PICT_INFO) {
  99             av_log(s->avctx, AV_LOG_DEBUG, "LSE palette %d tid:%d wt:%d maxtab:%d\n", id, tid, wt, maxtab);
 100         }
 101         if (maxtab >= 256) {
 102             avpriv_request_sample(s->avctx, ">8bit palette");
 103             return AVERROR_PATCHWELCOME;
 104         }
 105         maxtab = FFMIN(maxtab, (len - 5) / wt + s->palette_index);
 106
 107         if (s->palette_index > maxtab)
 108             return AVERROR_INVALIDDATA;
 109
 110         if ((s->avctx->pix_fmt == AV_PIX_FMT_GRAY8 || s->avctx->pix_fmt == AV_PIX_FMT_PAL8) &&
 111             (s->picture_ptr->format == AV_PIX_FMT_GRAY8 || s->picture_ptr->format == AV_PIX_FMT_PAL8)) {
 112             uint32_t *pal = (uint32_t *)s->picture_ptr->data[1];
 113             s->picture_ptr->format =
 114             s->avctx->pix_fmt = AV_PIX_FMT_PAL8;
 115             for (i=s->palette_index; i<=maxtab; i++) {
 116                 pal[i] = 0;
 117                 for (j=0; j<wt; j++) {
 118                     pal[i] |= get_bits(&s->gb, 8) << (8*(wt-j-1));
 119                 }
 120             }
 121             s->palette_index = i;
 122         }
 123         break;
 124     case 4:
 125         avpriv_request_sample(s->avctx, "oversize image");
 126         return AVERROR(ENOSYS);
 127     default:
 128         av_log(s->avctx, AV_LOG_ERROR, "invalid id %d\n", id);
 129         return AVERROR_INVALIDDATA;
 130     }
 131     av_dlog(s->avctx, "ID=%i, T=%i,%i,%i\n", id, s->t1, s->t2, s->t3);
 132
 133     return 0;
 134 }
 135
 136 /**
 137  * Get context-dependent Golomb code, decode it and update context
 138  */
 139 static inline int ls_get_code_regular(GetBitContext *gb, JLSState *state, int Q)
 140 {
 141     int k, ret;
 142
 143     for (k = 0; (state->N[Q] << k) < state->A[Q]; k++)
 144         ;
 145
 146 #ifdef JLS_BROKEN
 147     if (!show_bits_long(gb, 32))
 148         return -1;
 149 #endif
 150     ret = get_ur_golomb_jpegls(gb, k, state->limit, state->qbpp);
 151
 152     /* decode mapped error */
 153     if (ret & 1)
 154         ret = -(ret + 1 >> 1);
 155     else
 156         ret >>= 1;
 157
 158     /* for NEAR=0, k=0 and 2*B[Q] <= - N[Q] mapping is reversed */
 159     if (!state->near && !k && (2 * state->B[Q] <= -state->N[Q]))
 160         ret = -(ret + 1);
 161
 162     ret = ff_jpegls_update_state_regular(state, Q, ret);
 163
 164     return ret;
 165 }
 166
 167 /**
 168  * Get Golomb code, decode it and update state for run termination
 169  */
 170 static inline int ls_get_code_runterm(GetBitContext *gb, JLSState *state,
 171                                       int RItype, int limit_add)
 172 {
 173     int k, ret, temp, map;
 174     int Q = 365 + RItype;
 175
 176     temp = state->A[Q];
 177     if (RItype)
 178         temp += state->N[Q] >> 1;
 179
 180     for (k = 0; (state->N[Q] << k) < temp; k++)
 181         ;
 182
 183 #ifdef JLS_BROKEN
 184     if (!show_bits_long(gb, 32))
 185         return -1;
 186 #endif
 187     ret = get_ur_golomb_jpegls(gb, k, state->limit - limit_add - 1,
 188                                state->qbpp);
 189
 190     /* decode mapped error */
 191     map = 0;
 192     if (!k && (RItype || ret) && (2 * state->B[Q] < state->N[Q]))
 193         map = 1;
 194     ret += RItype + map;
 195
 196     if (ret & 1) {
 197         ret = map - (ret + 1 >> 1);
 198         state->B[Q]++;
 199     } else {
 200         ret = ret >> 1;
 201     }
 202
 203     if(FFABS(ret) > 0xFFFF)
 204         return -0x10000;
 205     /* update state */
 206     state->A[Q] += FFABS(ret) - RItype;
 207     ret         *= state->twonear;
 208     ff_jpegls_downscale_state(state, Q);
 209
 210     return ret;
 211 }
 212
 213 /**
 214  * Decode one line of image
 215  */
 216 static inline void ls_decode_line(JLSState *state, MJpegDecodeContext *s,
 217                                   void *last, void *dst, int last2, int w,
 218                                   int stride, int comp, int bits)
 219 {
 220     int i, x = 0;
 221     int Ra, Rb, Rc, Rd;
 222     int D0, D1, D2;
 223
 224     while (x < w) {
 225         int err, pred;
 226
 227         /* compute gradients */
 228         Ra = x ? R(dst, x - stride) : R(last, x);
 229         Rb = R(last, x);
 230         Rc = x ? R(last, x - stride) : last2;
 231         Rd = (x >= w - stride) ? R(last, x) : R(last, x + stride);
 232         D0 = Rd - Rb;
 233         D1 = Rb - Rc;
 234         D2 = Rc - Ra;
 235         /* run mode */
 236         if ((FFABS(D0) <= state->near) &&
 237             (FFABS(D1) <= state->near) &&
 238             (FFABS(D2) <= state->near)) {
 239             int r;
 240             int RItype;
 241
 242             /* decode full runs while available */
 243             while (get_bits1(&s->gb)) {
 244                 int r;
 245                 r = 1 << ff_log2_run[state->run_index[comp]];
 246                 if (x + r * stride > w)
 247                     r = (w - x) / stride;
 248                 for (i = 0; i < r; i++) {
 249                     W(dst, x, Ra);
 250                     x += stride;
 251                 }
 252                 /* if EOL reached, we stop decoding */
 253                 if (r != 1 << ff_log2_run[state->run_index[comp]])
 254                     return;
 255                 if (state->run_index[comp] < 31)
 256                     state->run_index[comp]++;
 257                 if (x + stride > w)
 258                     return;
 259             }
 260             /* decode aborted run */
 261             r = ff_log2_run[state->run_index[comp]];
 262             if (r)
 263                 r = get_bits_long(&s->gb, r);
 264             if (x + r * stride > w) {
 265                 r = (w - x) / stride;
 266             }
 267             for (i = 0; i < r; i++) {
 268                 W(dst, x, Ra);
 269                 x += stride;
 270             }
 271
 272             if (x >= w) {
 273                 av_log(NULL, AV_LOG_ERROR, "run overflow\n");
 274                 return;
 275             }
 276
 277             /* decode run termination value */
 278             Rb     = R(last, x);
 279             RItype = (FFABS(Ra - Rb) <= state->near) ? 1 : 0;
 280             err    = ls_get_code_runterm(&s->gb, state, RItype,
 281                                          ff_log2_run[state->run_index[comp]]);
 282             if (state->run_index[comp])
 283                 state->run_index[comp]--;
 284
 285             if (state->near && RItype) {
 286                 pred = Ra + err;
 287             } else {
 288                 if (Rb < Ra)
 289                     pred = Rb - err;
 290                 else
 291                     pred = Rb + err;
 292             }
 293         } else { /* regular mode */
 294             int context, sign;
 295
 296             context = ff_jpegls_quantize(state, D0) * 81 +
 297                       ff_jpegls_quantize(state, D1) *  9 +
 298                       ff_jpegls_quantize(state, D2);
 299             pred    = mid_pred(Ra, Ra + Rb - Rc, Rb);
 300
 301             if (context < 0) {
 302                 context = -context;
 303                 sign    = 1;
 304             } else {
 305                 sign = 0;
 306             }
 307
 308             if (sign) {
 309                 pred = av_clip(pred - state->C[context], 0, state->maxval);
 310                 err  = -ls_get_code_regular(&s->gb, state, context);
 311             } else {
 312                 pred = av_clip(pred + state->C[context], 0, state->maxval);
 313                 err  = ls_get_code_regular(&s->gb, state, context);
 314             }
 315
 316             /* we have to do something more for near-lossless coding */
 317             pred += err;
 318         }
 319         if (state->near) {
 320             if (pred < -state->near)
 321                 pred += state->range * state->twonear;
 322             else if (pred > state->maxval + state->near)
 323                 pred -= state->range * state->twonear;
 324             pred = av_clip(pred, 0, state->maxval);
 325         }
 326
 327         pred &= state->maxval;
 328         W(dst, x, pred);
 329         x += stride;
 330     }
 331 }
 332
 333 int ff_jpegls_decode_picture(MJpegDecodeContext *s, int near,
 334                              int point_transform, int ilv)
 335 {
 336     int i, t = 0;
 337     uint8_t *zero, *last, *cur;
 338     JLSState *state;
 339     int off = 0, stride = 1, width, shift, ret = 0;
 340
 341     zero = av_mallocz(s->picture_ptr->linesize[0]);
 342     last = zero;
 343     cur  = s->picture_ptr->data[0];
 344
 345     state = av_mallocz(sizeof(JLSState));
 346     /* initialize JPEG-LS state from JPEG parameters */
 347     state->near   = near;
 348     state->bpp    = (s->bits < 2) ? 2 : s->bits;
 349     state->maxval = s->maxval;
 350     state->T1     = s->t1;
 351     state->T2     = s->t2;
 352     state->T3     = s->t3;
 353     state->reset  = s->reset;
 354     ff_jpegls_reset_coding_parameters(state, 0);
 355     ff_jpegls_init_state(state);
 356
 357     if (s->bits <= 8)
 358         shift = point_transform + (8 - s->bits);
 359     else
 360         shift = point_transform + (16 - s->bits);
 361
 362     if (s->avctx->debug & FF_DEBUG_PICT_INFO) {
 363         av_log(s->avctx, AV_LOG_DEBUG,
 364                "JPEG-LS params: %ix%i NEAR=%i MV=%i T(%i,%i,%i) "
 365                "RESET=%i, LIMIT=%i, qbpp=%i, RANGE=%i\n",
 366                 s->width, s->height, state->near, state->maxval,
 367                 state->T1, state->T2, state->T3,
 368                 state->reset, state->limit, state->qbpp, state->range);
 369         av_log(s->avctx, AV_LOG_DEBUG, "JPEG params: ILV=%i Pt=%i BPP=%i, scan = %i\n",
 370                 ilv, point_transform, s->bits, s->cur_scan);
 371     }
 372     if (ilv == 0) { /* separate planes */
 373         if (s->cur_scan > s->nb_components) {
 374             ret = AVERROR_INVALIDDATA;
 375             goto end;
 376         }
 377         stride = (s->nb_components > 1) ? 3 : 1;
 378         off    = av_clip(s->cur_scan - 1, 0, stride - 1);
 379         width  = s->width * stride;
 380         cur   += off;
 381         for (i = 0; i < s->height; i++) {
 382             if (s->bits <= 8) {
 383                 ls_decode_line(state, s, last, cur, t, width, stride, off, 8);
 384                 t = last[0];
 385             } else {
 386                 ls_decode_line(state, s, last, cur, t, width, stride, off, 16);
 387                 t = *((uint16_t *)last);
 388             }
 389             last = cur;
 390             cur += s->picture_ptr->linesize[0];
 391
 392             if (s->restart_interval && !--s->restart_count) {
 393                 align_get_bits(&s->gb);
 394                 skip_bits(&s->gb, 16); /* skip RSTn */
 395             }
 396         }
 397     } else if (ilv == 1) { /* line interleaving */
 398         int j;
 399         int Rc[3] = { 0, 0, 0 };
 400         stride = (s->nb_components > 1) ? 3 : 1;
 401         memset(cur, 0, s->picture_ptr->linesize[0]);
 402         width = s->width * stride;
 403         for (i = 0; i < s->height; i++) {
 404             for (j = 0; j < stride; j++) {
 405                 ls_decode_line(state, s, last + j, cur + j,
 406                                Rc[j], width, stride, j, 8);
 407                 Rc[j] = last[j];
 408
 409                 if (s->restart_interval && !--s->restart_count) {
 410                     align_get_bits(&s->gb);
 411                     skip_bits(&s->gb, 16); /* skip RSTn */
 412                 }
 413             }
 414             last = cur;
 415             cur += s->picture_ptr->linesize[0];
 416         }
 417     } else if (ilv == 2) { /* sample interleaving */
 418         avpriv_report_missing_feature(s->avctx, "Sample interleaved images");
 419         ret = AVERROR_PATCHWELCOME;
 420         goto end;
 421     }
 422
 423     if (s->xfrm && s->nb_components == 3) {
 424         int x, w;
 425
 426         w = s->width * s->nb_components;
 427
 428         if (s->bits <= 8) {
 429             uint8_t *src = s->picture_ptr->data[0];
 430
 431             for (i = 0; i < s->height; i++) {
 432                 switch(s->xfrm) {
 433                 case 1:
 434                     for (x = off; x < w; x += 3) {
 435                         src[x  ] += src[x+1] + 128;
 436                         src[x+2] += src[x+1] + 128;
 437                     }
 438                     break;
 439                 case 2:
 440                     for (x = off; x < w; x += 3) {
 441                         src[x  ] += src[x+1] + 128;
 442                         src[x+2] += ((src[x  ] + src[x+1])>>1) + 128;
 443                     }
 444                     break;
 445                 case 3:
 446                     for (x = off; x < w; x += 3) {
 447                         int g = src[x+0] - ((src[x+2]+src[x+1])>>2) + 64;
 448                         src[x+0] = src[x+2] + g + 128;
 449                         src[x+2] = src[x+1] + g + 128;
 450                         src[x+1] = g;
 451                     }
 452                     break;
 453                 case 4:
 454                     for (x = off; x < w; x += 3) {
 455                         int r    = src[x+0] - ((                       359 * (src[x+2]-128) + 490) >> 8);
 456                         int g    = src[x+0] - (( 88 * (src[x+1]-128) - 183 * (src[x+2]-128) +  30) >> 8);
 457                         int b    = src[x+0] + ((454 * (src[x+1]-128)                        + 574) >> 8);
 458                         src[x+0] = av_clip_uint8(r);
 459                         src[x+1] = av_clip_uint8(g);
 460                         src[x+2] = av_clip_uint8(b);
 461                     }
 462                     break;
 463                 }
 464                 src += s->picture_ptr->linesize[0];
 465             }
 466         }else
 467             avpriv_report_missing_feature(s->avctx, "16bit xfrm");
 468     }
 469
 470     if (shift) { /* we need to do point transform or normalize samples */
 471         int x, w;
 472
 473         w = s->width * s->nb_components;
 474
 475         if (s->bits <= 8) {
 476             uint8_t *src = s->picture_ptr->data[0];
 477
 478             for (i = 0; i < s->height; i++) {
 479                 for (x = off; x < w; x += stride)
 480                     src[x] <<= shift;
 481                 src += s->picture_ptr->linesize[0];
 482             }
 483         } else {
 484             uint16_t *src = (uint16_t *)s->picture_ptr->data[0];
 485
 486             for (i = 0; i < s->height; i++) {
 487                 for (x = 0; x < w; x++)
 488                     src[x] <<= shift;
 489                 src += s->picture_ptr->linesize[0] / 2;
 490             }
 491         }
 492     }
 493
 494 end:
 495     av_free(state);
 496     av_free(zero);
 497
 498     return ret;
 499 }
 500
 501 AVCodec ff_jpegls_decoder = {
 502     .name           = "jpegls",
 503     .long_name      = NULL_IF_CONFIG_SMALL("JPEG-LS"),
 504     .type           = AVMEDIA_TYPE_VIDEO,
 505     .id             = AV_CODEC_ID_JPEGLS,
 506     .priv_data_size = sizeof(MJpegDecodeContext),
 507     .init           = ff_mjpeg_decode_init,
 508     .close          = ff_mjpeg_decode_end,
 509     .decode         = ff_mjpeg_decode_frame,
 510     .capabilities   = CODEC_CAP_DR1,
 511 };