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
36 #include "jpeglsdec.h"
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.
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
49 * Decode LSE block with initialization parameters
51 int ff_jpegls_decode_lse(MJpegDecodeContext *s)
54 int tid, wt, maxtab, i, j;
56 int len = get_bits(&s->gb, 16);
57 id = get_bits(&s->gb, 8);
62 return AVERROR_INVALIDDATA;
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);
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);
75 // ff_jpegls_reset_coding_parameters(s, 0);
81 tid= get_bits(&s->gb, 8);
82 wt = get_bits(&s->gb, 8);
85 return AVERROR_INVALIDDATA;
87 if (wt < 1 || wt > MAX_COMPONENTS) {
88 avpriv_request_sample(s->avctx, "wt %d", wt);
89 return AVERROR_PATCHWELCOME;
94 else if ((5 + wt*(s->maxval+1)) < 65535)
97 maxtab = 65530/wt - 1;
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);
103 avpriv_request_sample(s->avctx, ">8bit palette");
104 return AVERROR_PATCHWELCOME;
106 maxtab = FFMIN(maxtab, (len - 5) / wt + s->palette_index);
108 if (s->palette_index > maxtab)
109 return AVERROR_INVALIDDATA;
111 if ((s->avctx->pix_fmt == AV_PIX_FMT_GRAY8 || s->avctx->pix_fmt == AV_PIX_FMT_PAL8) &&
112 (s->picture_ptr->format == AV_PIX_FMT_GRAY8 || s->picture_ptr->format == AV_PIX_FMT_PAL8)) {
113 uint32_t *pal = (uint32_t *)s->picture_ptr->data[1];
114 s->picture_ptr->format =
115 s->avctx->pix_fmt = AV_PIX_FMT_PAL8;
116 for (i=s->palette_index; i<=maxtab; i++) {
118 for (j=0; j<wt; j++) {
119 pal[i] |= get_bits(&s->gb, 8) << (8*(wt-j-1));
122 s->palette_index = i;
126 avpriv_request_sample(s->avctx, "oversize image");
127 return AVERROR(ENOSYS);
129 av_log(s->avctx, AV_LOG_ERROR, "invalid id %d\n", id);
130 return AVERROR_INVALIDDATA;
132 av_dlog(s->avctx, "ID=%i, T=%i,%i,%i\n", id, s->t1, s->t2, s->t3);
138 * Get context-dependent Golomb code, decode it and update context
140 static inline int ls_get_code_regular(GetBitContext *gb, JLSState *state, int Q)
144 for (k = 0; (state->N[Q] << k) < state->A[Q]; k++)
148 if (!show_bits_long(gb, 32))
151 ret = get_ur_golomb_jpegls(gb, k, state->limit, state->qbpp);
153 /* decode mapped error */
155 ret = -(ret + 1 >> 1);
159 /* for NEAR=0, k=0 and 2*B[Q] <= - N[Q] mapping is reversed */
160 if (!state->near && !k && (2 * state->B[Q] <= -state->N[Q]))
163 ret = ff_jpegls_update_state_regular(state, Q, ret);
169 * Get Golomb code, decode it and update state for run termination
171 static inline int ls_get_code_runterm(GetBitContext *gb, JLSState *state,
172 int RItype, int limit_add)
174 int k, ret, temp, map;
175 int Q = 365 + RItype;
179 temp += state->N[Q] >> 1;
181 for (k = 0; (state->N[Q] << k) < temp; k++)
185 if (!show_bits_long(gb, 32))
188 ret = get_ur_golomb_jpegls(gb, k, state->limit - limit_add - 1,
191 /* decode mapped error */
193 if (!k && (RItype || ret) && (2 * state->B[Q] < state->N[Q]))
198 ret = map - (ret + 1 >> 1);
204 if(FFABS(ret) > 0xFFFF)
207 state->A[Q] += FFABS(ret) - RItype;
208 ret *= state->twonear;
209 ff_jpegls_downscale_state(state, Q);
215 * Decode one line of image
217 static inline void ls_decode_line(JLSState *state, MJpegDecodeContext *s,
218 void *last, void *dst, int last2, int w,
219 int stride, int comp, int bits)
228 /* compute gradients */
229 Ra = x ? R(dst, x - stride) : R(last, x);
231 Rc = x ? R(last, x - stride) : last2;
232 Rd = (x >= w - stride) ? R(last, x) : R(last, x + stride);
237 if ((FFABS(D0) <= state->near) &&
238 (FFABS(D1) <= state->near) &&
239 (FFABS(D2) <= state->near)) {
243 /* decode full runs while available */
244 while (get_bits1(&s->gb)) {
246 r = 1 << ff_log2_run[state->run_index[comp]];
247 if (x + r * stride > w)
248 r = (w - x) / stride;
249 for (i = 0; i < r; i++) {
253 /* if EOL reached, we stop decoding */
254 if (r != 1 << ff_log2_run[state->run_index[comp]])
256 if (state->run_index[comp] < 31)
257 state->run_index[comp]++;
261 /* decode aborted run */
262 r = ff_log2_run[state->run_index[comp]];
264 r = get_bits_long(&s->gb, r);
265 if (x + r * stride > w) {
266 r = (w - x) / stride;
268 for (i = 0; i < r; i++) {
274 av_log(NULL, AV_LOG_ERROR, "run overflow\n");
278 /* decode run termination value */
280 RItype = (FFABS(Ra - Rb) <= state->near) ? 1 : 0;
281 err = ls_get_code_runterm(&s->gb, state, RItype,
282 ff_log2_run[state->run_index[comp]]);
283 if (state->run_index[comp])
284 state->run_index[comp]--;
286 if (state->near && RItype) {
294 } else { /* regular mode */
297 context = ff_jpegls_quantize(state, D0) * 81 +
298 ff_jpegls_quantize(state, D1) * 9 +
299 ff_jpegls_quantize(state, D2);
300 pred = mid_pred(Ra, Ra + Rb - Rc, Rb);
310 pred = av_clip(pred - state->C[context], 0, state->maxval);
311 err = -ls_get_code_regular(&s->gb, state, context);
313 pred = av_clip(pred + state->C[context], 0, state->maxval);
314 err = ls_get_code_regular(&s->gb, state, context);
317 /* we have to do something more for near-lossless coding */
321 if (pred < -state->near)
322 pred += state->range * state->twonear;
323 else if (pred > state->maxval + state->near)
324 pred -= state->range * state->twonear;
325 pred = av_clip(pred, 0, state->maxval);
328 pred &= state->maxval;
334 int ff_jpegls_decode_picture(MJpegDecodeContext *s, int near,
335 int point_transform, int ilv)
338 uint8_t *zero, *last, *cur;
340 int off = 0, stride = 1, width, shift, ret = 0;
342 zero = av_mallocz(s->picture_ptr->linesize[0]);
344 cur = s->picture_ptr->data[0];
346 state = av_mallocz(sizeof(JLSState));
347 /* initialize JPEG-LS state from JPEG parameters */
349 state->bpp = (s->bits < 2) ? 2 : s->bits;
350 state->maxval = s->maxval;
354 state->reset = s->reset;
355 ff_jpegls_reset_coding_parameters(state, 0);
356 ff_jpegls_init_state(state);
359 shift = point_transform + (8 - s->bits);
361 shift = point_transform + (16 - s->bits);
363 if (s->avctx->debug & FF_DEBUG_PICT_INFO) {
364 av_log(s->avctx, AV_LOG_DEBUG,
365 "JPEG-LS params: %ix%i NEAR=%i MV=%i T(%i,%i,%i) "
366 "RESET=%i, LIMIT=%i, qbpp=%i, RANGE=%i\n",
367 s->width, s->height, state->near, state->maxval,
368 state->T1, state->T2, state->T3,
369 state->reset, state->limit, state->qbpp, state->range);
370 av_log(s->avctx, AV_LOG_DEBUG, "JPEG params: ILV=%i Pt=%i BPP=%i, scan = %i\n",
371 ilv, point_transform, s->bits, s->cur_scan);
373 if (ilv == 0) { /* separate planes */
374 if (s->cur_scan > s->nb_components) {
375 ret = AVERROR_INVALIDDATA;
378 stride = (s->nb_components > 1) ? 3 : 1;
379 off = av_clip(s->cur_scan - 1, 0, stride - 1);
380 width = s->width * stride;
382 for (i = 0; i < s->height; i++) {
384 ls_decode_line(state, s, last, cur, t, width, stride, off, 8);
387 ls_decode_line(state, s, last, cur, t, width, stride, off, 16);
388 t = *((uint16_t *)last);
391 cur += s->picture_ptr->linesize[0];
393 if (s->restart_interval && !--s->restart_count) {
394 align_get_bits(&s->gb);
395 skip_bits(&s->gb, 16); /* skip RSTn */
398 } else if (ilv == 1) { /* line interleaving */
400 int Rc[3] = { 0, 0, 0 };
401 stride = (s->nb_components > 1) ? 3 : 1;
402 memset(cur, 0, s->picture_ptr->linesize[0]);
403 width = s->width * stride;
404 for (i = 0; i < s->height; i++) {
405 for (j = 0; j < stride; j++) {
406 ls_decode_line(state, s, last + j, cur + j,
407 Rc[j], width, stride, j, 8);
410 if (s->restart_interval && !--s->restart_count) {
411 align_get_bits(&s->gb);
412 skip_bits(&s->gb, 16); /* skip RSTn */
416 cur += s->picture_ptr->linesize[0];
418 } else if (ilv == 2) { /* sample interleaving */
419 avpriv_report_missing_feature(s->avctx, "Sample interleaved images");
420 ret = AVERROR_PATCHWELCOME;
424 if (s->xfrm && s->nb_components == 3) {
427 w = s->width * s->nb_components;
430 uint8_t *src = s->picture_ptr->data[0];
432 for (i = 0; i < s->height; i++) {
435 for (x = off; x < w; x += 3) {
436 src[x ] += src[x+1] + 128;
437 src[x+2] += src[x+1] + 128;
441 for (x = off; x < w; x += 3) {
442 src[x ] += src[x+1] + 128;
443 src[x+2] += ((src[x ] + src[x+1])>>1) + 128;
447 for (x = off; x < w; x += 3) {
448 int g = src[x+0] - ((src[x+2]+src[x+1])>>2) + 64;
449 src[x+0] = src[x+2] + g + 128;
450 src[x+2] = src[x+1] + g + 128;
455 for (x = off; x < w; x += 3) {
456 int r = src[x+0] - (( 359 * (src[x+2]-128) + 490) >> 8);
457 int g = src[x+0] - (( 88 * (src[x+1]-128) - 183 * (src[x+2]-128) + 30) >> 8);
458 int b = src[x+0] + ((454 * (src[x+1]-128) + 574) >> 8);
459 src[x+0] = av_clip_uint8(r);
460 src[x+1] = av_clip_uint8(g);
461 src[x+2] = av_clip_uint8(b);
465 src += s->picture_ptr->linesize[0];
468 avpriv_report_missing_feature(s->avctx, "16bit xfrm");
471 if (shift) { /* we need to do point transform or normalize samples */
474 w = s->width * s->nb_components;
477 uint8_t *src = s->picture_ptr->data[0];
479 for (i = 0; i < s->height; i++) {
480 for (x = off; x < w; x += stride)
482 src += s->picture_ptr->linesize[0];
485 uint16_t *src = (uint16_t *)s->picture_ptr->data[0];
487 for (i = 0; i < s->height; i++) {
488 for (x = 0; x < w; x++)
490 src += s->picture_ptr->linesize[0] / 2;
502 AVCodec ff_jpegls_decoder = {
504 .long_name = NULL_IF_CONFIG_SMALL("JPEG-LS"),
505 .type = AVMEDIA_TYPE_VIDEO,
506 .id = AV_CODEC_ID_JPEGLS,
507 .priv_data_size = sizeof(MJpegDecodeContext),
508 .init = ff_mjpeg_decode_init,
509 .close = ff_mjpeg_decode_end,
510 .decode = ff_mjpeg_decode_frame,
511 .capabilities = CODEC_CAP_DR1,
512 .caps_internal = FF_CODEC_CAP_INIT_THREADSAFE,