3 * Copyright (c) 2003 Michael Niedermayer
4 * Copyright (c) 2006 Konstantin Shishkov
6 * This file is part of FFmpeg.
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.
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.
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
35 #include "jpeglsdec.h"
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.
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
48 * Decode LSE block with initialization parameters
50 int ff_jpegls_decode_lse(MJpegDecodeContext *s)
53 int tid, wt, maxtab, i, j;
55 int len = get_bits(&s->gb, 16); /* length: FIXME: verify field validity */
56 id = get_bits(&s->gb, 8);
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);
66 // ff_jpegls_reset_coding_parameters(s, 0);
72 tid= get_bits(&s->gb, 8);
73 wt = get_bits(&s->gb, 8);
76 return AVERROR_INVALIDDATA;
78 if (wt < 1 || wt > MAX_COMPONENTS) {
79 avpriv_request_sample(s->avctx, "wt %d", wt);
80 return AVERROR_PATCHWELCOME;
85 else if ((5 + wt*(s->maxval+1)) < 65535)
88 maxtab = 65530/wt - 1;
90 if(s->avctx->debug & FF_DEBUG_PICT_INFO) {
91 av_log(s->avctx, AV_LOG_DEBUG, "LSE palette %d tid:%d wt:%d maxtab:%d\n", id, tid, wt, maxtab);
94 avpriv_request_sample(s->avctx, ">8bit palette");
95 return AVERROR_PATCHWELCOME;
97 maxtab = FFMIN(maxtab, (len - 5) / wt + s->palette_index);
99 if (s->palette_index > maxtab)
100 return AVERROR_INVALIDDATA;
102 if ((s->avctx->pix_fmt == AV_PIX_FMT_GRAY8 || s->avctx->pix_fmt == AV_PIX_FMT_PAL8) &&
103 (s->picture_ptr->format == AV_PIX_FMT_GRAY8 || s->picture_ptr->format == AV_PIX_FMT_PAL8)) {
104 uint32_t *pal = s->picture_ptr->data[1];
105 s->picture_ptr->format =
106 s->avctx->pix_fmt = AV_PIX_FMT_PAL8;
107 for (i=s->palette_index; i<=maxtab; i++) {
109 for (j=0; j<wt; j++) {
110 pal[i] |= get_bits(&s->gb, 8) << (8*(wt-j-1));
113 s->palette_index = i;
117 av_log(s->avctx, AV_LOG_ERROR, "oversize image not supported\n");
118 return AVERROR(ENOSYS);
120 av_log(s->avctx, AV_LOG_ERROR, "invalid id %d\n", id);
121 return AVERROR_INVALIDDATA;
123 av_dlog(s->avctx, "ID=%i, T=%i,%i,%i\n", id, s->t1, s->t2, s->t3);
129 * Get context-dependent Golomb code, decode it and update context
131 static inline int ls_get_code_regular(GetBitContext *gb, JLSState *state, int Q)
135 for (k = 0; (state->N[Q] << k) < state->A[Q]; k++)
139 if (!show_bits_long(gb, 32))
142 ret = get_ur_golomb_jpegls(gb, k, state->limit, state->qbpp);
144 /* decode mapped error */
146 ret = -(ret + 1 >> 1);
150 /* for NEAR=0, k=0 and 2*B[Q] <= - N[Q] mapping is reversed */
151 if (!state->near && !k && (2 * state->B[Q] <= -state->N[Q]))
154 ret = ff_jpegls_update_state_regular(state, Q, ret);
160 * Get Golomb code, decode it and update state for run termination
162 static inline int ls_get_code_runterm(GetBitContext *gb, JLSState *state,
163 int RItype, int limit_add)
165 int k, ret, temp, map;
166 int Q = 365 + RItype;
170 temp += state->N[Q] >> 1;
172 for (k = 0; (state->N[Q] << k) < temp; k++)
176 if (!show_bits_long(gb, 32))
179 ret = get_ur_golomb_jpegls(gb, k, state->limit - limit_add - 1,
182 /* decode mapped error */
184 if (!k && (RItype || ret) && (2 * state->B[Q] < state->N[Q]))
189 ret = map - (ret + 1 >> 1);
195 if(FFABS(ret) > 0xFFFF)
198 state->A[Q] += FFABS(ret) - RItype;
199 ret *= state->twonear;
200 ff_jpegls_downscale_state(state, Q);
206 * Decode one line of image
208 static inline void ls_decode_line(JLSState *state, MJpegDecodeContext *s,
209 void *last, void *dst, int last2, int w,
210 int stride, int comp, int bits)
219 /* compute gradients */
220 Ra = x ? R(dst, x - stride) : R(last, x);
222 Rc = x ? R(last, x - stride) : last2;
223 Rd = (x >= w - stride) ? R(last, x) : R(last, x + stride);
228 if ((FFABS(D0) <= state->near) &&
229 (FFABS(D1) <= state->near) &&
230 (FFABS(D2) <= state->near)) {
234 /* decode full runs while available */
235 while (get_bits1(&s->gb)) {
237 r = 1 << ff_log2_run[state->run_index[comp]];
238 if (x + r * stride > w)
239 r = (w - x) / stride;
240 for (i = 0; i < r; i++) {
244 /* if EOL reached, we stop decoding */
245 if (r != 1 << ff_log2_run[state->run_index[comp]])
247 if (state->run_index[comp] < 31)
248 state->run_index[comp]++;
252 /* decode aborted run */
253 r = ff_log2_run[state->run_index[comp]];
255 r = get_bits_long(&s->gb, r);
256 if (x + r * stride > w) {
257 r = (w - x) / stride;
259 for (i = 0; i < r; i++) {
264 /* decode run termination value */
266 RItype = (FFABS(Ra - Rb) <= state->near) ? 1 : 0;
267 err = ls_get_code_runterm(&s->gb, state, RItype,
268 ff_log2_run[state->run_index[comp]]);
269 if (state->run_index[comp])
270 state->run_index[comp]--;
272 if (state->near && RItype) {
280 } else { /* regular mode */
283 context = ff_jpegls_quantize(state, D0) * 81 +
284 ff_jpegls_quantize(state, D1) * 9 +
285 ff_jpegls_quantize(state, D2);
286 pred = mid_pred(Ra, Ra + Rb - Rc, Rb);
296 pred = av_clip(pred - state->C[context], 0, state->maxval);
297 err = -ls_get_code_regular(&s->gb, state, context);
299 pred = av_clip(pred + state->C[context], 0, state->maxval);
300 err = ls_get_code_regular(&s->gb, state, context);
303 /* we have to do something more for near-lossless coding */
307 if (pred < -state->near)
308 pred += state->range * state->twonear;
309 else if (pred > state->maxval + state->near)
310 pred -= state->range * state->twonear;
311 pred = av_clip(pred, 0, state->maxval);
314 pred &= state->maxval;
320 int ff_jpegls_decode_picture(MJpegDecodeContext *s, int near,
321 int point_transform, int ilv)
324 uint8_t *zero, *last, *cur;
326 int off = 0, stride = 1, width, shift, ret = 0;
328 zero = av_mallocz(s->picture_ptr->linesize[0]);
330 cur = s->picture_ptr->data[0];
332 state = av_mallocz(sizeof(JLSState));
333 /* initialize JPEG-LS state from JPEG parameters */
335 state->bpp = (s->bits < 2) ? 2 : s->bits;
336 state->maxval = s->maxval;
340 state->reset = s->reset;
341 ff_jpegls_reset_coding_parameters(state, 0);
342 ff_jpegls_init_state(state);
345 shift = point_transform + (8 - s->bits);
347 shift = point_transform + (16 - s->bits);
349 if (s->avctx->debug & FF_DEBUG_PICT_INFO) {
350 av_log(s->avctx, AV_LOG_DEBUG,
351 "JPEG-LS params: %ix%i NEAR=%i MV=%i T(%i,%i,%i) "
352 "RESET=%i, LIMIT=%i, qbpp=%i, RANGE=%i\n",
353 s->width, s->height, state->near, state->maxval,
354 state->T1, state->T2, state->T3,
355 state->reset, state->limit, state->qbpp, state->range);
356 av_log(s->avctx, AV_LOG_DEBUG, "JPEG params: ILV=%i Pt=%i BPP=%i, scan = %i\n",
357 ilv, point_transform, s->bits, s->cur_scan);
359 if (ilv == 0) { /* separate planes */
360 if (s->cur_scan > s->nb_components) {
361 ret = AVERROR_INVALIDDATA;
364 stride = (s->nb_components > 1) ? 3 : 1;
365 off = av_clip(s->cur_scan - 1, 0, stride - 1);
366 width = s->width * stride;
368 for (i = 0; i < s->height; i++) {
370 ls_decode_line(state, s, last, cur, t, width, stride, off, 8);
373 ls_decode_line(state, s, last, cur, t, width, stride, off, 16);
374 t = *((uint16_t *)last);
377 cur += s->picture_ptr->linesize[0];
379 if (s->restart_interval && !--s->restart_count) {
380 align_get_bits(&s->gb);
381 skip_bits(&s->gb, 16); /* skip RSTn */
384 } else if (ilv == 1) { /* line interleaving */
386 int Rc[3] = { 0, 0, 0 };
387 stride = (s->nb_components > 1) ? 3 : 1;
388 memset(cur, 0, s->picture_ptr->linesize[0]);
389 width = s->width * stride;
390 for (i = 0; i < s->height; i++) {
391 for (j = 0; j < stride; j++) {
392 ls_decode_line(state, s, last + j, cur + j,
393 Rc[j], width, stride, j, 8);
396 if (s->restart_interval && !--s->restart_count) {
397 align_get_bits(&s->gb);
398 skip_bits(&s->gb, 16); /* skip RSTn */
402 cur += s->picture_ptr->linesize[0];
404 } else if (ilv == 2) { /* sample interleaving */
405 avpriv_report_missing_feature(s->avctx, "Sample interleaved images");
406 ret = AVERROR_PATCHWELCOME;
410 if (s->xfrm && s->nb_components == 3) {
413 w = s->width * s->nb_components;
416 uint8_t *src = s->picture_ptr->data[0];
418 for (i = 0; i < s->height; i++) {
421 for (x = off; x < w; x += 3) {
422 src[x ] += src[x+1] + 128;
423 src[x+2] += src[x+1] + 128;
427 for (x = off; x < w; x += 3) {
428 src[x ] += src[x+1] + 128;
429 src[x+2] += ((src[x ] + src[x+1])>>1) + 128;
433 for (x = off; x < w; x += 3) {
434 int g = src[x+0] - ((src[x+2]+src[x+1])>>2) + 64;
435 src[x+0] = src[x+2] + g + 128;
436 src[x+2] = src[x+1] + g + 128;
441 for (x = off; x < w; x += 3) {
442 int r = src[x+0] - (( 359 * (src[x+2]-128) + 490) >> 8);
443 int g = src[x+0] - (( 88 * (src[x+1]-128) - 183 * (src[x+2]-128) + 30) >> 8);
444 int b = src[x+0] + ((454 * (src[x+1]-128) + 574) >> 8);
445 src[x+0] = av_clip_uint8(r);
446 src[x+1] = av_clip_uint8(g);
447 src[x+2] = av_clip_uint8(b);
451 src += s->picture_ptr->linesize[0];
454 avpriv_report_missing_feature(s->avctx, "16bit xfrm");
457 if (shift) { /* we need to do point transform or normalize samples */
460 w = s->width * s->nb_components;
463 uint8_t *src = s->picture_ptr->data[0];
465 for (i = 0; i < s->height; i++) {
466 for (x = off; x < w; x += stride)
468 src += s->picture_ptr->linesize[0];
471 uint16_t *src = (uint16_t *)s->picture_ptr->data[0];
473 for (i = 0; i < s->height; i++) {
474 for (x = 0; x < w; x++)
476 src += s->picture_ptr->linesize[0] / 2;
488 AVCodec ff_jpegls_decoder = {
490 .long_name = NULL_IF_CONFIG_SMALL("JPEG-LS"),
491 .type = AVMEDIA_TYPE_VIDEO,
492 .id = AV_CODEC_ID_JPEGLS,
493 .priv_data_size = sizeof(MJpegDecodeContext),
494 .init = ff_mjpeg_decode_init,
495 .close = ff_mjpeg_decode_end,
496 .decode = ff_mjpeg_decode_frame,
497 .capabilities = CODEC_CAP_DR1,