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 Libav.
   7  *
   8  * Libav 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  * Libav 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 Libav; 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_legacy.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, Libav Golomb decoder is painfully slow
  44  * on this errors.
  45  */
  46 //#define JLS_BROKEN
  47
  48 /**
  49  * Decode LSE block with initialization parameters
  50  */
  51 int ff_jpegls_decode_lse(MJpegDecodeContext *s)
  52 {
  53     int id;
  54
  55     skip_bits(&s->gb, 16);  /* length: FIXME: verify field validity */
  56     id = get_bits(&s->gb, 8);
  57
  58     switch (id) {
  59     case 1:
  60         s->maxval = get_bits(&s->gb, 16);
  61         s->t1     = get_bits(&s->gb, 16);
  62         s->t2     = get_bits(&s->gb, 16);
  63         s->t3     = get_bits(&s->gb, 16);
  64         s->reset  = get_bits(&s->gb, 16);
  65
  66 //        ff_jpegls_reset_coding_parameters(s, 0);
  67         //FIXME quant table?
  68         break;
  69     case 2:
  70     case 3:
  71         av_log(s->avctx, AV_LOG_ERROR, "palette not supported\n");
  72         return AVERROR(ENOSYS);
  73     case 4:
  74         av_log(s->avctx, AV_LOG_ERROR, "oversize image not supported\n");
  75         return AVERROR(ENOSYS);
  76     default:
  77         av_log(s->avctx, AV_LOG_ERROR, "invalid id %d\n", id);
  78         return AVERROR_INVALIDDATA;
  79     }
  80     ff_dlog(s->avctx, "ID=%i, T=%i,%i,%i\n", id, s->t1, s->t2, s->t3);
  81
  82     return 0;
  83 }
  84
  85 /**
  86  * Get context-dependent Golomb code, decode it and update context
  87  */
  88 static inline int ls_get_code_regular(GetBitContext *gb, JLSState *state, int Q)
  89 {
  90     int k, ret;
  91
  92     for (k = 0; (state->N[Q] << k) < state->A[Q]; k++)
  93         ;
  94
  95 #ifdef JLS_BROKEN
  96     if (!show_bits_long(gb, 32))
  97         return -1;
  98 #endif
  99     ret = get_ur_golomb_jpegls(gb, k, state->limit, state->qbpp);
 100
 101     /* decode mapped error */
 102     if (ret & 1)
 103         ret = -(ret + 1 >> 1);
 104     else
 105         ret >>= 1;
 106
 107     /* for NEAR=0, k=0 and 2*B[Q] <= - N[Q] mapping is reversed */
 108     if (!state->near && !k && (2 * state->B[Q] <= -state->N[Q]))
 109         ret = -(ret + 1);
 110
 111     ret = ff_jpegls_update_state_regular(state, Q, ret);
 112
 113     return ret;
 114 }
 115
 116 /**
 117  * Get Golomb code, decode it and update state for run termination
 118  */
 119 static inline int ls_get_code_runterm(GetBitContext *gb, JLSState *state,
 120                                       int RItype, int limit_add)
 121 {
 122     int k, ret, temp, map;
 123     int Q = 365 + RItype;
 124
 125     temp = state->A[Q];
 126     if (RItype)
 127         temp += state->N[Q] >> 1;
 128
 129     for (k = 0; (state->N[Q] << k) < temp; k++)
 130         ;
 131
 132 #ifdef JLS_BROKEN
 133     if (!show_bits_long(gb, 32))
 134         return -1;
 135 #endif
 136     ret = get_ur_golomb_jpegls(gb, k, state->limit - limit_add - 1,
 137                                state->qbpp);
 138
 139     /* decode mapped error */
 140     map = 0;
 141     if (!k && (RItype || ret) && (2 * state->B[Q] < state->N[Q]))
 142         map = 1;
 143     ret += RItype + map;
 144
 145     if (ret & 1) {
 146         ret = map - (ret + 1 >> 1);
 147         state->B[Q]++;
 148     } else {
 149         ret = ret >> 1;
 150     }
 151
 152     /* update state */
 153     state->A[Q] += FFABS(ret) - RItype;
 154     ret         *= state->twonear;
 155     ff_jpegls_downscale_state(state, Q);
 156
 157     return ret;
 158 }
 159
 160 /**
 161  * Decode one line of image
 162  */
 163 static inline void ls_decode_line(JLSState *state, MJpegDecodeContext *s,
 164                                   void *last, void *dst, int last2, int w,
 165                                   int stride, int comp, int bits)
 166 {
 167     int i, x = 0;
 168     int Ra, Rb, Rc, Rd;
 169     int D0, D1, D2;
 170
 171     while (x < w) {
 172         int err, pred;
 173
 174         /* compute gradients */
 175         Ra = x ? R(dst, x - stride) : R(last, x);
 176         Rb = R(last, x);
 177         Rc = x ? R(last, x - stride) : last2;
 178         Rd = (x >= w - stride) ? R(last, x) : R(last, x + stride);
 179         D0 = Rd - Rb;
 180         D1 = Rb - Rc;
 181         D2 = Rc - Ra;
 182         /* run mode */
 183         if ((FFABS(D0) <= state->near) &&
 184             (FFABS(D1) <= state->near) &&
 185             (FFABS(D2) <= state->near)) {
 186             int r;
 187             int RItype;
 188
 189             /* decode full runs while available */
 190             while (get_bits1(&s->gb)) {
 191                 int r;
 192                 r = 1 << ff_log2_run[state->run_index[comp]];
 193                 if (x + r * stride > w)
 194                     r = (w - x) / stride;
 195                 for (i = 0; i < r; i++) {
 196                     W(dst, x, Ra);
 197                     x += stride;
 198                 }
 199                 /* if EOL reached, we stop decoding */
 200                 if (r != 1 << ff_log2_run[state->run_index[comp]])
 201                     return;
 202                 if (state->run_index[comp] < 31)
 203                     state->run_index[comp]++;
 204                 if (x + stride > w)
 205                     return;
 206             }
 207             /* decode aborted run */
 208             r = ff_log2_run[state->run_index[comp]];
 209             if (r)
 210                 r = get_bits_long(&s->gb, r);
 211             for (i = 0; i < r; i++) {
 212                 W(dst, x, Ra);
 213                 x += stride;
 214             }
 215
 216             /* decode run termination value */
 217             Rb     = R(last, x);
 218             RItype = (FFABS(Ra - Rb) <= state->near) ? 1 : 0;
 219             err    = ls_get_code_runterm(&s->gb, state, RItype,
 220                                          ff_log2_run[state->run_index[comp]]);
 221             if (state->run_index[comp])
 222                 state->run_index[comp]--;
 223
 224             if (state->near && RItype) {
 225                 pred = Ra + err;
 226             } else {
 227                 if (Rb < Ra)
 228                     pred = Rb - err;
 229                 else
 230                     pred = Rb + err;
 231             }
 232         } else { /* regular mode */
 233             int context, sign;
 234
 235             context = ff_jpegls_quantize(state, D0) * 81 +
 236                       ff_jpegls_quantize(state, D1) *  9 +
 237                       ff_jpegls_quantize(state, D2);
 238             pred    = mid_pred(Ra, Ra + Rb - Rc, Rb);
 239
 240             if (context < 0) {
 241                 context = -context;
 242                 sign    = 1;
 243             } else {
 244                 sign = 0;
 245             }
 246
 247             if (sign) {
 248                 pred = av_clip(pred - state->C[context], 0, state->maxval);
 249                 err  = -ls_get_code_regular(&s->gb, state, context);
 250             } else {
 251                 pred = av_clip(pred + state->C[context], 0, state->maxval);
 252                 err  = ls_get_code_regular(&s->gb, state, context);
 253             }
 254
 255             /* we have to do something more for near-lossless coding */
 256             pred += err;
 257         }
 258         if (state->near) {
 259             if (pred < -state->near)
 260                 pred += state->range * state->twonear;
 261             else if (pred > state->maxval + state->near)
 262                 pred -= state->range * state->twonear;
 263             pred = av_clip(pred, 0, state->maxval);
 264         }
 265
 266         pred &= state->maxval;
 267         W(dst, x, pred);
 268         x += stride;
 269     }
 270 }
 271
 272 int ff_jpegls_decode_picture(MJpegDecodeContext *s, int near,
 273                              int point_transform, int ilv)
 274 {
 275     int i, t = 0;
 276     uint8_t *zero, *last, *cur;
 277     JLSState *state;
 278     int off = 0, stride = 1, width, shift, ret = 0;
 279
 280     zero = av_mallocz(s->picture_ptr->linesize[0]);
 281     if (!zero)
 282         return AVERROR(ENOMEM);
 283     last = zero;
 284     cur  = s->picture_ptr->data[0];
 285
 286     state = av_mallocz(sizeof(JLSState));
 287     if (!state) {
 288         av_free(zero);
 289         return AVERROR(ENOMEM);
 290     }
 291     /* initialize JPEG-LS state from JPEG parameters */
 292     state->near   = near;
 293     state->bpp    = (s->bits < 2) ? 2 : s->bits;
 294     state->maxval = s->maxval;
 295     state->T1     = s->t1;
 296     state->T2     = s->t2;
 297     state->T3     = s->t3;
 298     state->reset  = s->reset;
 299     ff_jpegls_reset_coding_parameters(state, 0);
 300     ff_jpegls_init_state(state);
 301
 302     if (s->bits <= 8)
 303         shift = point_transform + (8 - s->bits);
 304     else
 305         shift = point_transform + (16 - s->bits);
 306
 307     ff_dlog(s->avctx,
 308             "JPEG-LS params: %ix%i NEAR=%i MV=%i T(%i,%i,%i) "
 309             "RESET=%i, LIMIT=%i, qbpp=%i, RANGE=%i\n",
 310             s->width, s->height, state->near, state->maxval,
 311             state->T1, state->T2, state->T3,
 312             state->reset, state->limit, state->qbpp, state->range);
 313     ff_dlog(s->avctx, "JPEG params: ILV=%i Pt=%i BPP=%i, scan = %i\n",
 314             ilv, point_transform, s->bits, s->cur_scan);
 315     if (ilv == 0) { /* separate planes */
 316         if (s->cur_scan > s->nb_components) {
 317             ret = AVERROR_INVALIDDATA;
 318             goto end;
 319         }
 320         off    = s->cur_scan - 1;
 321         stride = (s->nb_components > 1) ? 3 : 1;
 322         width  = s->width * stride;
 323         cur   += off;
 324         for (i = 0; i < s->height; i++) {
 325             if (s->bits <= 8) {
 326                 ls_decode_line(state, s, last, cur, t, width, stride, off, 8);
 327                 t = last[0];
 328             } else {
 329                 ls_decode_line(state, s, last, cur, t, width, stride, off, 16);
 330                 t = *((uint16_t *)last);
 331             }
 332             last = cur;
 333             cur += s->picture_ptr->linesize[0];
 334
 335             if (s->restart_interval && !--s->restart_count) {
 336                 align_get_bits(&s->gb);
 337                 skip_bits(&s->gb, 16); /* skip RSTn */
 338             }
 339         }
 340     } else if (ilv == 1) { /* line interleaving */
 341         int j;
 342         int Rc[3] = { 0, 0, 0 };
 343         memset(cur, 0, s->picture_ptr->linesize[0]);
 344         width = s->width * 3;
 345         for (i = 0; i < s->height; i++) {
 346             for (j = 0; j < 3; j++) {
 347                 ls_decode_line(state, s, last + j, cur + j,
 348                                Rc[j], width, 3, j, 8);
 349                 Rc[j] = last[j];
 350
 351                 if (s->restart_interval && !--s->restart_count) {
 352                     align_get_bits(&s->gb);
 353                     skip_bits(&s->gb, 16); /* skip RSTn */
 354                 }
 355             }
 356             last = cur;
 357             cur += s->picture_ptr->linesize[0];
 358         }
 359     } else if (ilv == 2) { /* sample interleaving */
 360         avpriv_report_missing_feature(s->avctx, "Sample interleaved images");
 361         ret = AVERROR_PATCHWELCOME;
 362         goto end;
 363     }
 364
 365     if (shift) { /* we need to do point transform or normalize samples */
 366         int x, w;
 367
 368         w = s->width * s->nb_components;
 369
 370         if (s->bits <= 8) {
 371             uint8_t *src = s->picture_ptr->data[0];
 372
 373             for (i = 0; i < s->height; i++) {
 374                 for (x = off; x < w; x += stride)
 375                     src[x] <<= shift;
 376                 src += s->picture_ptr->linesize[0];
 377             }
 378         } else {
 379             uint16_t *src = (uint16_t *)s->picture_ptr->data[0];
 380
 381             for (i = 0; i < s->height; i++) {
 382                 for (x = 0; x < w; x++)
 383                     src[x] <<= shift;
 384                 src += s->picture_ptr->linesize[0] / 2;
 385             }
 386         }
 387     }
 388
 389 end:
 390     av_free(state);
 391     av_free(zero);
 392
 393     return ret;
 394 }
 395
 396 AVCodec ff_jpegls_decoder = {
 397     .name           = "jpegls",
 398     .long_name      = NULL_IF_CONFIG_SMALL("JPEG-LS"),
 399     .type           = AVMEDIA_TYPE_VIDEO,
 400     .id             = AV_CODEC_ID_JPEGLS,
 401     .priv_data_size = sizeof(MJpegDecodeContext),
 402     .init           = ff_mjpeg_decode_init,
 403     .close          = ff_mjpeg_decode_end,
 404     .decode         = ff_mjpeg_decode_frame,
 405     .capabilities   = AV_CODEC_CAP_DR1,
 406     .caps_internal  = FF_CODEC_CAP_INIT_THREADSAFE,
 407 };