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path: root/libavcodec/jpeglsenc.c (plain)
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1/*
2 * JPEG-LS encoder
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 encoder.
26 */
27
28#include "avcodec.h"
29#include "get_bits.h"
30#include "put_bits.h"
31#include "golomb.h"
32#include "internal.h"
33#include "mathops.h"
34#include "mjpeg.h"
35#include "mjpegenc.h"
36#include "jpegls.h"
37
38typedef struct JPEGLSContext {
39 AVClass *class;
40
41 int pred;
42} JPEGLSContext;
43
44/**
45 * Encode error from regular symbol
46 */
47static inline void ls_encode_regular(JLSState *state, PutBitContext *pb, int Q,
48 int err)
49{
50 int k;
51 int val;
52 int map;
53
54 for (k = 0; (state->N[Q] << k) < state->A[Q]; k++)
55 ;
56
57 map = !state->near && !k && (2 * state->B[Q] <= -state->N[Q]);
58
59 if (err < 0)
60 err += state->range;
61 if (err >= (state->range + 1 >> 1)) {
62 err -= state->range;
63 val = 2 * FFABS(err) - 1 - map;
64 } else
65 val = 2 * err + map;
66
67 set_ur_golomb_jpegls(pb, val, k, state->limit, state->qbpp);
68
69 ff_jpegls_update_state_regular(state, Q, err);
70}
71
72/**
73 * Encode error from run termination
74 */
75static inline void ls_encode_runterm(JLSState *state, PutBitContext *pb,
76 int RItype, int err, int limit_add)
77{
78 int k;
79 int val, map;
80 int Q = 365 + RItype;
81 int temp;
82
83 temp = state->A[Q];
84 if (RItype)
85 temp += state->N[Q] >> 1;
86 for (k = 0; (state->N[Q] << k) < temp; k++)
87 ;
88 map = 0;
89 if (!k && err && (2 * state->B[Q] < state->N[Q]))
90 map = 1;
91
92 if (err < 0)
93 val = -(2 * err) - 1 - RItype + map;
94 else
95 val = 2 * err - RItype - map;
96 set_ur_golomb_jpegls(pb, val, k, state->limit - limit_add - 1, state->qbpp);
97
98 if (err < 0)
99 state->B[Q]++;
100 state->A[Q] += (val + 1 - RItype) >> 1;
101
102 ff_jpegls_downscale_state(state, Q);
103}
104
105/**
106 * Encode run value as specified by JPEG-LS standard
107 */
108static inline void ls_encode_run(JLSState *state, PutBitContext *pb, int run,
109 int comp, int trail)
110{
111 while (run >= (1 << ff_log2_run[state->run_index[comp]])) {
112 put_bits(pb, 1, 1);
113 run -= 1 << ff_log2_run[state->run_index[comp]];
114 if (state->run_index[comp] < 31)
115 state->run_index[comp]++;
116 }
117 /* if hit EOL, encode another full run, else encode aborted run */
118 if (!trail && run) {
119 put_bits(pb, 1, 1);
120 } else if (trail) {
121 put_bits(pb, 1, 0);
122 if (ff_log2_run[state->run_index[comp]])
123 put_bits(pb, ff_log2_run[state->run_index[comp]], run);
124 }
125}
126
127/**
128 * Encode one line of image
129 */
130static inline void ls_encode_line(JLSState *state, PutBitContext *pb,
131 void *last, void *cur, int last2, int w,
132 int stride, int comp, int bits)
133{
134 int x = 0;
135 int Ra, Rb, Rc, Rd;
136 int D0, D1, D2;
137
138 while (x < w) {
139 int err, pred, sign;
140
141 /* compute gradients */
142 Ra = x ? R(cur, x - stride) : R(last, x);
143 Rb = R(last, x);
144 Rc = x ? R(last, x - stride) : last2;
145 Rd = (x >= w - stride) ? R(last, x) : R(last, x + stride);
146 D0 = Rd - Rb;
147 D1 = Rb - Rc;
148 D2 = Rc - Ra;
149
150 /* run mode */
151 if ((FFABS(D0) <= state->near) &&
152 (FFABS(D1) <= state->near) &&
153 (FFABS(D2) <= state->near)) {
154 int RUNval, RItype, run;
155
156 run = 0;
157 RUNval = Ra;
158 while (x < w && (FFABS(R(cur, x) - RUNval) <= state->near)) {
159 run++;
160 W(cur, x, Ra);
161 x += stride;
162 }
163 ls_encode_run(state, pb, run, comp, x < w);
164 if (x >= w)
165 return;
166 Rb = R(last, x);
167 RItype = FFABS(Ra - Rb) <= state->near;
168 pred = RItype ? Ra : Rb;
169 err = R(cur, x) - pred;
170
171 if (!RItype && Ra > Rb)
172 err = -err;
173
174 if (state->near) {
175 if (err > 0)
176 err = (state->near + err) / state->twonear;
177 else
178 err = -(state->near - err) / state->twonear;
179
180 if (RItype || (Rb >= Ra))
181 Ra = av_clip(pred + err * state->twonear, 0, state->maxval);
182 else
183 Ra = av_clip(pred - err * state->twonear, 0, state->maxval);
184 W(cur, x, Ra);
185 }
186 if (err < 0)
187 err += state->range;
188 if (err >= state->range + 1 >> 1)
189 err -= state->range;
190
191 ls_encode_runterm(state, pb, RItype, err,
192 ff_log2_run[state->run_index[comp]]);
193
194 if (state->run_index[comp] > 0)
195 state->run_index[comp]--;
196 } else { /* regular mode */
197 int context;
198
199 context = ff_jpegls_quantize(state, D0) * 81 +
200 ff_jpegls_quantize(state, D1) * 9 +
201 ff_jpegls_quantize(state, D2);
202 pred = mid_pred(Ra, Ra + Rb - Rc, Rb);
203
204 if (context < 0) {
205 context = -context;
206 sign = 1;
207 pred = av_clip(pred - state->C[context], 0, state->maxval);
208 err = pred - R(cur, x);
209 } else {
210 sign = 0;
211 pred = av_clip(pred + state->C[context], 0, state->maxval);
212 err = R(cur, x) - pred;
213 }
214
215 if (state->near) {
216 if (err > 0)
217 err = (state->near + err) / state->twonear;
218 else
219 err = -(state->near - err) / state->twonear;
220 if (!sign)
221 Ra = av_clip(pred + err * state->twonear, 0, state->maxval);
222 else
223 Ra = av_clip(pred - err * state->twonear, 0, state->maxval);
224 W(cur, x, Ra);
225 }
226
227 ls_encode_regular(state, pb, context, err);
228 }
229 x += stride;
230 }
231}
232
233static void ls_store_lse(JLSState *state, PutBitContext *pb)
234{
235 /* Test if we have default params and don't need to store LSE */
236 JLSState state2 = { 0 };
237 state2.bpp = state->bpp;
238 state2.near = state->near;
239 ff_jpegls_reset_coding_parameters(&state2, 1);
240 if (state->T1 == state2.T1 &&
241 state->T2 == state2.T2 &&
242 state->T3 == state2.T3 &&
243 state->reset == state2.reset)
244 return;
245 /* store LSE type 1 */
246 put_marker(pb, LSE);
247 put_bits(pb, 16, 13);
248 put_bits(pb, 8, 1);
249 put_bits(pb, 16, state->maxval);
250 put_bits(pb, 16, state->T1);
251 put_bits(pb, 16, state->T2);
252 put_bits(pb, 16, state->T3);
253 put_bits(pb, 16, state->reset);
254}
255
256static int encode_picture_ls(AVCodecContext *avctx, AVPacket *pkt,
257 const AVFrame *pict, int *got_packet)
258{
259 JPEGLSContext *ctx = avctx->priv_data;
260 const AVFrame *const p = pict;
261 PutBitContext pb, pb2;
262 GetBitContext gb;
263 uint8_t *buf2 = NULL;
264 uint8_t *zero = NULL;
265 uint8_t *cur = NULL;
266 uint8_t *last = NULL;
267 JLSState *state = NULL;
268 int i, size, ret;
269 int comps;
270
271#if FF_API_PRIVATE_OPT
272FF_DISABLE_DEPRECATION_WARNINGS
273 if (avctx->prediction_method)
274 ctx->pred = avctx->prediction_method;
275FF_ENABLE_DEPRECATION_WARNINGS
276#endif
277
278 if (avctx->pix_fmt == AV_PIX_FMT_GRAY8 ||
279 avctx->pix_fmt == AV_PIX_FMT_GRAY16)
280 comps = 1;
281 else
282 comps = 3;
283
284 if ((ret = ff_alloc_packet2(avctx, pkt, avctx->width *avctx->height * comps * 4 +
285 AV_INPUT_BUFFER_MIN_SIZE, 0)) < 0)
286 return ret;
287
288 buf2 = av_malloc(pkt->size);
289 if (!buf2)
290 goto memfail;
291
292 init_put_bits(&pb, pkt->data, pkt->size);
293 init_put_bits(&pb2, buf2, pkt->size);
294
295 /* write our own JPEG header, can't use mjpeg_picture_header */
296 put_marker(&pb, SOI);
297 put_marker(&pb, SOF48);
298 put_bits(&pb, 16, 8 + comps * 3); // header size depends on components
299 put_bits(&pb, 8, (avctx->pix_fmt == AV_PIX_FMT_GRAY16) ? 16 : 8); // bpp
300 put_bits(&pb, 16, avctx->height);
301 put_bits(&pb, 16, avctx->width);
302 put_bits(&pb, 8, comps); // components
303 for (i = 1; i <= comps; i++) {
304 put_bits(&pb, 8, i); // component ID
305 put_bits(&pb, 8, 0x11); // subsampling: none
306 put_bits(&pb, 8, 0); // Tiq, used by JPEG-LS ext
307 }
308
309 put_marker(&pb, SOS);
310 put_bits(&pb, 16, 6 + comps * 2);
311 put_bits(&pb, 8, comps);
312 for (i = 1; i <= comps; i++) {
313 put_bits(&pb, 8, i); // component ID
314 put_bits(&pb, 8, 0); // mapping index: none
315 }
316 put_bits(&pb, 8, ctx->pred);
317 put_bits(&pb, 8, (comps > 1) ? 1 : 0); // interleaving: 0 - plane, 1 - line
318 put_bits(&pb, 8, 0); // point transform: none
319
320 state = av_mallocz(sizeof(JLSState));
321 if (!state)
322 goto memfail;
323
324 /* initialize JPEG-LS state from JPEG parameters */
325 state->near = ctx->pred;
326 state->bpp = (avctx->pix_fmt == AV_PIX_FMT_GRAY16) ? 16 : 8;
327 ff_jpegls_reset_coding_parameters(state, 0);
328 ff_jpegls_init_state(state);
329
330 ls_store_lse(state, &pb);
331
332 zero = last = av_mallocz(FFABS(p->linesize[0]));
333 if (!zero)
334 goto memfail;
335
336 cur = p->data[0];
337 if (avctx->pix_fmt == AV_PIX_FMT_GRAY8) {
338 int t = 0;
339
340 for (i = 0; i < avctx->height; i++) {
341 ls_encode_line(state, &pb2, last, cur, t, avctx->width, 1, 0, 8);
342 t = last[0];
343 last = cur;
344 cur += p->linesize[0];
345 }
346 } else if (avctx->pix_fmt == AV_PIX_FMT_GRAY16) {
347 int t = 0;
348
349 for (i = 0; i < avctx->height; i++) {
350 ls_encode_line(state, &pb2, last, cur, t, avctx->width, 1, 0, 16);
351 t = *((uint16_t *)last);
352 last = cur;
353 cur += p->linesize[0];
354 }
355 } else if (avctx->pix_fmt == AV_PIX_FMT_RGB24) {
356 int j, width;
357 int Rc[3] = { 0, 0, 0 };
358
359 width = avctx->width * 3;
360 for (i = 0; i < avctx->height; i++) {
361 for (j = 0; j < 3; j++) {
362 ls_encode_line(state, &pb2, last + j, cur + j, Rc[j],
363 width, 3, j, 8);
364 Rc[j] = last[j];
365 }
366 last = cur;
367 cur += p->linesize[0];
368 }
369 } else if (avctx->pix_fmt == AV_PIX_FMT_BGR24) {
370 int j, width;
371 int Rc[3] = { 0, 0, 0 };
372
373 width = avctx->width * 3;
374 for (i = 0; i < avctx->height; i++) {
375 for (j = 2; j >= 0; j--) {
376 ls_encode_line(state, &pb2, last + j, cur + j, Rc[j],
377 width, 3, j, 8);
378 Rc[j] = last[j];
379 }
380 last = cur;
381 cur += p->linesize[0];
382 }
383 }
384
385 av_freep(&zero);
386 av_freep(&state);
387
388 /* the specification says that after doing 0xff escaping unused bits in
389 * the last byte must be set to 0, so just append 7 "optional" zero bits
390 * to avoid special-casing. */
391 put_bits(&pb2, 7, 0);
392 size = put_bits_count(&pb2);
393 flush_put_bits(&pb2);
394 /* do escape coding */
395 init_get_bits(&gb, buf2, size);
396 size -= 7;
397 while (get_bits_count(&gb) < size) {
398 int v;
399 v = get_bits(&gb, 8);
400 put_bits(&pb, 8, v);
401 if (v == 0xFF) {
402 v = get_bits(&gb, 7);
403 put_bits(&pb, 8, v);
404 }
405 }
406 avpriv_align_put_bits(&pb);
407 av_freep(&buf2);
408
409 /* End of image */
410 put_marker(&pb, EOI);
411 flush_put_bits(&pb);
412
413 emms_c();
414
415 pkt->size = put_bits_count(&pb) >> 3;
416 pkt->flags |= AV_PKT_FLAG_KEY;
417 *got_packet = 1;
418 return 0;
419
420memfail:
421 av_packet_unref(pkt);
422 av_freep(&buf2);
423 av_freep(&state);
424 av_freep(&zero);
425 return AVERROR(ENOMEM);
426}
427
428static av_cold int encode_init_ls(AVCodecContext *ctx)
429{
430#if FF_API_CODED_FRAME
431FF_DISABLE_DEPRECATION_WARNINGS
432 ctx->coded_frame->pict_type = AV_PICTURE_TYPE_I;
433 ctx->coded_frame->key_frame = 1;
434FF_ENABLE_DEPRECATION_WARNINGS
435#endif
436
437 if (ctx->pix_fmt != AV_PIX_FMT_GRAY8 &&
438 ctx->pix_fmt != AV_PIX_FMT_GRAY16 &&
439 ctx->pix_fmt != AV_PIX_FMT_RGB24 &&
440 ctx->pix_fmt != AV_PIX_FMT_BGR24) {
441 av_log(ctx, AV_LOG_ERROR,
442 "Only grayscale and RGB24/BGR24 images are supported\n");
443 return -1;
444 }
445 return 0;
446}
447
448#define OFFSET(x) offsetof(JPEGLSContext, x)
449#define VE AV_OPT_FLAG_VIDEO_PARAM | AV_OPT_FLAG_ENCODING_PARAM
450static const AVOption options[] = {
451{ "pred", "Prediction method", OFFSET(pred), AV_OPT_TYPE_INT, { .i64 = 0 }, 0, 2, VE, "pred" },
452 { "left", NULL, 0, AV_OPT_TYPE_CONST, { .i64 = 0 }, INT_MIN, INT_MAX, VE, "pred" },
453 { "plane", NULL, 0, AV_OPT_TYPE_CONST, { .i64 = 1 }, INT_MIN, INT_MAX, VE, "pred" },
454 { "median", NULL, 0, AV_OPT_TYPE_CONST, { .i64 = 2 }, INT_MIN, INT_MAX, VE, "pred" },
455
456 { NULL},
457};
458
459static const AVClass jpegls_class = {
460 .class_name = "jpegls",
461 .item_name = av_default_item_name,
462 .option = options,
463 .version = LIBAVUTIL_VERSION_INT,
464};
465
466AVCodec ff_jpegls_encoder = {
467 .name = "jpegls",
468 .long_name = NULL_IF_CONFIG_SMALL("JPEG-LS"),
469 .type = AVMEDIA_TYPE_VIDEO,
470 .id = AV_CODEC_ID_JPEGLS,
471 .priv_data_size = sizeof(JPEGLSContext),
472 .priv_class = &jpegls_class,
473 .init = encode_init_ls,
474 .capabilities = AV_CODEC_CAP_FRAME_THREADS | AV_CODEC_CAP_INTRA_ONLY,
475 .encode2 = encode_picture_ls,
476 .pix_fmts = (const enum AVPixelFormat[]) {
477 AV_PIX_FMT_BGR24, AV_PIX_FMT_RGB24,
478 AV_PIX_FMT_GRAY8, AV_PIX_FMT_GRAY16,
479 AV_PIX_FMT_NONE
480 },
481 .caps_internal = FF_CODEC_CAP_INIT_THREADSAFE |
482 FF_CODEC_CAP_INIT_CLEANUP,
483};
484
generated by cgit at 2024-05-17 03:05:26 (GMT)