FFmpeg coverage

Directory: ../../../ffmpeg/
File: src/libavcodec/jpeglsenc.c
Date: 2025-11-03 23:54:27
Exec Total Coverage
Lines: 200 249 80.3%
Functions: 9 9 100.0%
Branches: 111 166 66.9%
Line Branch Exec Source
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 #define UNCHECKED_BITSTREAM_READER 1
29 #include "libavutil/mem.h"
30 #include "libavutil/opt.h"
31 #include "avcodec.h"
32 #include "bytestream.h"
33 #include "codec_internal.h"
34 #include "encode.h"
35 #include "get_bits.h"
36 #include "put_bits.h"
37 #include "put_golomb.h"
38 #include "mathops.h"
39 #include "mjpeg.h"
40 #include "jpegls.h"
41
42 typedef struct JPEGLSContext {
43 AVClass *class;
44
45 int pred;
46 int comps;
47
48 size_t size;
49 uint8_t *buf;
50 } JPEGLSContext;
51
52 800 static inline void put_marker_byteu(PutByteContext *pb, enum JpegMarker code)
53 {
54 800 bytestream2_put_byteu(pb, 0xff);
55 800 bytestream2_put_byteu(pb, code);
56 800 }
57
58 /**
59 * Encode error from regular symbol
60 */
61 43082291 static inline void ls_encode_regular(JLSState *state, PutBitContext *pb, int Q,
62 int err)
63 {
64 int k;
65 int val;
66 int map;
67
68
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 157370825 for (k = 0; (state->N[Q] << k) < state->A[Q]; k++)
69 ;
70
71
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 43082291 map = !state->near && !k && (2 * state->B[Q] <= -state->N[Q]);
72
73
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 43082291 if (err < 0)
74 22103040 err += state->range;
75
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 43082291 if (err >= (state->range + 1 >> 1)) {
76 22391239 err -= state->range;
77 22391239 val = 2 * FFABS(err) - 1 - map;
78 } else
79 20691052 val = 2 * err + map;
80
81 43082291 set_ur_golomb_jpegls(pb, val, k, state->limit, state->qbpp);
82
83 43082291 ff_jpegls_update_state_regular(state, Q, err);
84 43082291 }
85
86 /**
87 * Encode error from run termination
88 */
89 511058 static inline void ls_encode_runterm(JLSState *state, PutBitContext *pb,
90 int RItype, int err, int limit_add)
91 {
92 int k;
93 int val, map;
94 511058 int Q = 365 + RItype;
95 int temp;
96
97 511058 temp = state->A[Q];
98
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 511058 if (RItype)
99 285855 temp += state->N[Q] >> 1;
100
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 2112443 for (k = 0; (state->N[Q] << k) < temp; k++)
101 ;
102 511058 map = 0;
103
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 511058 if (!k && err && (2 * state->B[Q] < state->N[Q]))
104 3887 map = 1;
105
106
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 511058 if (err < 0)
107 224602 val = -(2 * err) - 1 - RItype + map;
108 else
109 286456 val = 2 * err - RItype - map;
110 511058 set_ur_golomb_jpegls(pb, val, k, state->limit - limit_add - 1, state->qbpp);
111
112
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 511058 if (err < 0)
113 224602 state->B[Q]++;
114 511058 state->A[Q] += (val + 1 - RItype) >> 1;
115
116 511058 ff_jpegls_downscale_state(state, Q);
117 511058 }
118
119 /**
120 * Encode run value as specified by JPEG-LS standard
121 */
122 516421 static inline void ls_encode_run(JLSState *state, PutBitContext *pb, int run,
123 int comp, int trail)
124 {
125
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 983239 while (run >= (1 << ff_log2_run[state->run_index[comp]])) {
126 466818 put_bits(pb, 1, 1);
127 466818 run -= 1 << ff_log2_run[state->run_index[comp]];
128
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 466818 if (state->run_index[comp] < 31)
129 466818 state->run_index[comp]++;
130 }
131 /* if hit EOL, encode another full run, else encode aborted run */
132
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 516421 if (!trail && run) {
133 4162 put_bits(pb, 1, 1);
134
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 512259 } else if (trail) {
135 511058 put_bits(pb, 1, 0);
136
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 511058 if (ff_log2_run[state->run_index[comp]])
137 414758 put_bits(pb, ff_log2_run[state->run_index[comp]], run);
138 }
139 516421 }
140
141 /**
142 * Encode one line of image
143 */
144 134700 static inline void ls_encode_line(JLSState *state, PutBitContext *pb,
145 void *tmp, const void *in, int last2, int w,
146 int stride, int comp, int bits)
147 {
148 134700 int x = 0;
149
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 134700 int Ra = R(tmp, 0), Rb, Rc = last2, Rd;
150 int D0, D1, D2;
151
152
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 43728049 while (x < w) {
153 int err, pred, sign;
154
155 /* compute gradients */
156
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 43598712 Rb = R(tmp, x);
157
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 43598712 Rd = (x >= w - stride) ? R(tmp, x) : R(tmp, x + stride);
158 43598712 D0 = Rd - Rb;
159 43598712 D1 = Rb - Rc;
160 43598712 D2 = Rc - Ra;
161
162 /* run mode */
163
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 43598712 if ((FFABS(D0) <= state->near) &&
164
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 4643505 (FFABS(D1) <= state->near) &&
165
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 2133452 (FFABS(D2) <= state->near)) {
166 int RUNval, RItype, run;
167
168 516421 run = 0;
169 516421 RUNval = Ra;
170
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 2715672 while (x < w && (FFABS(R(in, x) - RUNval) <= state->near)) {
171 2199251 run++;
172
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 2199251 W(tmp, x, Ra);
173 2199251 x += stride;
174 }
175 516421 ls_encode_run(state, pb, run, comp, x < w);
176
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 516421 if (x >= w)
177 5363 return;
178
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 511058 Rb = R(tmp, x);
179 511058 RItype = FFABS(Ra - Rb) <= state->near;
180
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 511058 pred = RItype ? Ra : Rb;
181
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 511058 err = R(in, x) - pred;
182
183
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 511058 if (!RItype && Ra > Rb)
184 145241 err = -err;
185
186
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 511058 if (state->near) {
187 ✗ if (err > 0)
188 ✗ err = (state->near + err) / state->twonear;
189 else
190 ✗ err = -(state->near - err) / state->twonear;
191
192 ✗ if (RItype || (Rb >= Ra))
193 ✗ Ra = av_clip(pred + err * state->twonear, 0, state->maxval);
194 else
195 ✗ Ra = av_clip(pred - err * state->twonear, 0, state->maxval);
196 } else
197
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 511058 Ra = R(in, x);
198
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 511058 W(tmp, x, Ra);
199
200
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 511058 if (err < 0)
201 228701 err += state->range;
202
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 511058 if (err >= state->range + 1 >> 1)
203 224602 err -= state->range;
204
205 511058 ls_encode_runterm(state, pb, RItype, err,
206 511058 ff_log2_run[state->run_index[comp]]);
207
208
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 511058 if (state->run_index[comp] > 0)
209 464801 state->run_index[comp]--;
210 } else { /* regular mode */
211 int context;
212
213 43082291 context = ff_jpegls_quantize(state, D0) * 81 +
214 43082291 ff_jpegls_quantize(state, D1) * 9 +
215 43082291 ff_jpegls_quantize(state, D2);
216 43082291 pred = mid_pred(Ra, Ra + Rb - Rc, Rb);
217
218
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 43082291 if (context < 0) {
219 17406898 context = -context;
220 17406898 sign = 1;
221 17406898 pred = av_clip(pred - state->C[context], 0, state->maxval);
222
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 17406898 err = pred - R(in, x);
223 } else {
224 25675393 sign = 0;
225 25675393 pred = av_clip(pred + state->C[context], 0, state->maxval);
226
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 25675393 err = R(in, x) - pred;
227 }
228
229
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 43082291 if (state->near) {
230 ✗ if (err > 0)
231 ✗ err = (state->near + err) / state->twonear;
232 else
233 ✗ err = -(state->near - err) / state->twonear;
234 ✗ if (!sign)
235 ✗ Ra = av_clip(pred + err * state->twonear, 0, state->maxval);
236 else
237 ✗ Ra = av_clip(pred - err * state->twonear, 0, state->maxval);
238 } else
239
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 43082291 Ra = R(in, x);
240
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 43082291 W(tmp, x, Ra);
241
242 43082291 ls_encode_regular(state, pb, context, err);
243 }
244 43593349 Rc = Rb;
245 43593349 x += stride;
246 }
247 }
248
249 200 static void ls_store_lse(JLSState *state, PutByteContext *pb)
250 {
251 /* Test if we have default params and don't need to store LSE */
252 200 JLSState state2 = { 0 };
253 200 state2.bpp = state->bpp;
254 200 state2.near = state->near;
255 200 ff_jpegls_reset_coding_parameters(&state2, 1);
256
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 200 if (state->T1 == state2.T1 &&
257
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 200 state->T2 == state2.T2 &&
258
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 200 state->T3 == state2.T3 &&
259
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 200 state->reset == state2.reset)
260 200 return;
261 /* store LSE type 1 */
262 ✗ put_marker_byteu(pb, LSE);
263 ✗ bytestream2_put_be16u(pb, 13);
264 ✗ bytestream2_put_byteu(pb, 1);
265 ✗ bytestream2_put_be16u(pb, state->maxval);
266 ✗ bytestream2_put_be16u(pb, state->T1);
267 ✗ bytestream2_put_be16u(pb, state->T2);
268 ✗ bytestream2_put_be16u(pb, state->T3);
269 ✗ bytestream2_put_be16u(pb, state->reset);
270 }
271
272 200 static int encode_picture_ls(AVCodecContext *avctx, AVPacket *pkt,
273 const AVFrame *pict, int *got_packet)
274 {
275 200 JPEGLSContext *ctx = avctx->priv_data;
276 200 const AVFrame *const p = pict;
277 PutByteContext pb;
278 PutBitContext pb2;
279 GetBitContext gb;
280 const uint8_t *in;
281 200 uint8_t *last = NULL;
282 200 JLSState state = { 0 };
283 size_t size;
284 int i, ret, size_in_bits;
285 int comps;
286
287 200 last = av_mallocz(FFABS(p->linesize[0]));
288
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 200 if (!last)
289 ✗ return AVERROR(ENOMEM);
290
291 200 init_put_bits(&pb2, ctx->buf, ctx->size);
292
293 200 comps = ctx->comps;
294 /* initialize JPEG-LS state from JPEG parameters */
295 200 state.near = ctx->pred;
296
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 200 state.bpp = (avctx->pix_fmt == AV_PIX_FMT_GRAY16) ? 16 : 8;
297 200 ff_jpegls_reset_coding_parameters(&state, 0);
298 200 ff_jpegls_init_state(&state);
299
300 200 in = p->data[0];
301
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 200 if (avctx->pix_fmt == AV_PIX_FMT_GRAY8) {
302 ✗ int t = 0;
303
304 ✗ for (i = 0; i < avctx->height; i++) {
305 ✗ int last0 = last[0];
306 ✗ ls_encode_line(&state, &pb2, last, in, t, avctx->width, 1, 0, 8);
307 ✗ t = last0;
308 ✗ in += p->linesize[0];
309 }
310
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 200 } else if (avctx->pix_fmt == AV_PIX_FMT_GRAY16) {
311 ✗ int t = 0;
312
313 ✗ for (i = 0; i < avctx->height; i++) {
314 ✗ int last0 = *((uint16_t *)last);
315 ✗ ls_encode_line(&state, &pb2, last, in, t, avctx->width, 1, 0, 16);
316 ✗ t = last0;
317 ✗ in += p->linesize[0];
318 }
319
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 200 } else if (avctx->pix_fmt == AV_PIX_FMT_RGB24) {
320 int j, width;
321 200 int Rc[3] = { 0, 0, 0 };
322
323 200 width = avctx->width * 3;
324
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 45100 for (i = 0; i < avctx->height; i++) {
325
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 179600 for (j = 0; j < 3; j++) {
326 134700 int last0 = last[j];
327 134700 ls_encode_line(&state, &pb2, last + j, in + j, Rc[j],
328 width, 3, j, 8);
329 134700 Rc[j] = last0;
330 }
331 44900 in += p->linesize[0];
332 }
333 ✗ } else if (avctx->pix_fmt == AV_PIX_FMT_BGR24) {
334 int j, width;
335 ✗ int Rc[3] = { 0, 0, 0 };
336
337 ✗ width = avctx->width * 3;
338 ✗ for (i = 0; i < avctx->height; i++) {
339 ✗ for (j = 2; j >= 0; j--) {
340 ✗ int last0 = last[j];
341 ✗ ls_encode_line(&state, &pb2, last + j, in + j, Rc[j],
342 width, 3, j, 8);
343 ✗ Rc[j] = last0;
344 }
345 ✗ in += p->linesize[0];
346 }
347 }
348 200 av_free(last);
349 /* Now the actual image data has been written, which enables us to estimate
350 * the needed packet size: For every 15 input bits, an escape bit might be
351 * added below; and if put_bits_count % 15 is >= 8, then another bit might
352 * be added.
353 * Furthermore the specification says that after doing 0xff escaping unused
354 * bits in the last byte must be set to 0, so just append 7 "optional" zero
355 * bits to avoid special-casing. This also simplifies the size calculation:
356 * Properly rounding up is now automatically baked-in. */
357 200 put_bits(&pb2, 7, 0);
358 /* Make sure that the bit count + padding is representable in an int;
359 necessary for put_bits_count() as well as for using a GetBitContext. */
360
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 200 if (put_bytes_count(&pb2, 0) > INT_MAX / 8 - AV_INPUT_BUFFER_PADDING_SIZE)
361 ✗ return AVERROR(ERANGE);
362 200 size_in_bits = put_bits_count(&pb2);
363 200 flush_put_bits(&pb2);
364 200 size = size_in_bits * 2U / 15;
365 200 size += 2 + 2 + 2 + 1 + 2 + 2 + 1 + comps * (1 + 1 + 1) + 2 + 2 + 1
366 200 + comps * (1 + 1) + 1 + 1 + 1; /* Header */
367 200 size += 2 + 2 + 1 + 2 + 2 + 2 + 2 + 2; /* LSE */
368 200 size += 2; /* EOI */
369
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 200 if ((ret = ff_get_encode_buffer(avctx, pkt, size, 0)) < 0)
370 ✗ return ret;
371
372 200 bytestream2_init_writer(&pb, pkt->data, pkt->size);
373
374 /* write our own JPEG header, can't use mjpeg_picture_header */
375 200 put_marker_byteu(&pb, SOI);
376 200 put_marker_byteu(&pb, SOF48);
377 200 bytestream2_put_be16u(&pb, 8 + comps * 3); // header size depends on components
378
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 200 bytestream2_put_byteu(&pb, (avctx->pix_fmt == AV_PIX_FMT_GRAY16) ? 16 : 8); // bpp
379 200 bytestream2_put_be16u(&pb, avctx->height);
380 200 bytestream2_put_be16u(&pb, avctx->width);
381 200 bytestream2_put_byteu(&pb, comps); // components
382
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 800 for (i = 1; i <= comps; i++) {
383 600 bytestream2_put_byteu(&pb, i); // component ID
384 600 bytestream2_put_byteu(&pb, 0x11); // subsampling: none
385 600 bytestream2_put_byteu(&pb, 0); // Tiq, used by JPEG-LS ext
386 }
387
388 200 put_marker_byteu(&pb, SOS);
389 200 bytestream2_put_be16u(&pb, 6 + comps * 2);
390 200 bytestream2_put_byteu(&pb, comps);
391
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 800 for (i = 1; i <= comps; i++) {
392 600 bytestream2_put_byteu(&pb, i); // component ID
393 600 bytestream2_put_byteu(&pb, 0); // mapping index: none
394 }
395 200 bytestream2_put_byteu(&pb, ctx->pred);
396 200 bytestream2_put_byteu(&pb, (comps > 1) ? 1 : 0); // interleaving: 0 - plane, 1 - line
397 200 bytestream2_put_byteu(&pb, 0); // point transform: none
398
399 200 ls_store_lse(&state, &pb);
400
401 /* do escape coding */
402 200 init_get_bits(&gb, pb2.buf, size_in_bits);
403 200 size_in_bits -= 7;
404
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 25690423 while (get_bits_count(&gb) < size_in_bits) {
405 int v;
406 25690023 v = get_bits(&gb, 8);
407 25690023 bytestream2_put_byteu(&pb, v);
408
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 25690023 if (v == 0xFF) {
409 144308 v = get_bits(&gb, 7);
410 144308 bytestream2_put_byteu(&pb, v);
411 }
412 }
413
414 /* End of image */
415 200 put_marker_byteu(&pb, EOI);
416
417 200 av_shrink_packet(pkt, bytestream2_tell_p(&pb));
418 200 *got_packet = 1;
419 200 return 0;
420 }
421
422 4 static av_cold int encode_jpegls_init(AVCodecContext *avctx)
423 {
424 4 JPEGLSContext *ctx = avctx->priv_data;
425 size_t size;
426
427
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 4 if ((avctx->width | avctx->height) > UINT16_MAX) {
428 ✗ av_log(avctx, AV_LOG_ERROR, "Dimensions exceeding 65535x65535\n");
429 ✗ return AVERROR(EINVAL);
430 }
431
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 4 if (avctx->pix_fmt == AV_PIX_FMT_GRAY8 ||
432
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 4 avctx->pix_fmt == AV_PIX_FMT_GRAY16)
433 ✗ ctx->comps = 1;
434 else
435 4 ctx->comps = 3;
436 4 size = FF_INPUT_BUFFER_MIN_SIZE;
437 /* INT_MAX due to PutBit-API. */
438
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 4 if (avctx->width * (unsigned)avctx->height > (INT_MAX - size) / 4 / ctx->comps)
439 ✗ return AVERROR(ERANGE);
440 4 size += 4 * ctx->comps * avctx->width * avctx->height;
441 4 ctx->size = size;
442 4 ctx->buf = av_malloc(size + AV_INPUT_BUFFER_PADDING_SIZE);
443
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 4 if (!ctx->buf)
444 ✗ return AVERROR(ENOMEM);
445
446 4 return 0;
447 }
448
449 4 static av_cold int encode_jpegls_close(AVCodecContext *avctx)
450 {
451 4 JPEGLSContext *ctx = avctx->priv_data;
452
453 4 av_freep(&ctx->buf);
454 4 return 0;
455 }
456
457 #define OFFSET(x) offsetof(JPEGLSContext, x)
458 #define VE AV_OPT_FLAG_VIDEO_PARAM | AV_OPT_FLAG_ENCODING_PARAM
459 static const AVOption options[] = {
460 { "pred", "Prediction method", OFFSET(pred), AV_OPT_TYPE_INT, { .i64 = 0 }, 0, 2, VE, .unit = "pred" },
461 { "left", NULL, 0, AV_OPT_TYPE_CONST, { .i64 = 0 }, INT_MIN, INT_MAX, VE, .unit = "pred" },
462 { "plane", NULL, 0, AV_OPT_TYPE_CONST, { .i64 = 1 }, INT_MIN, INT_MAX, VE, .unit = "pred" },
463 { "median", NULL, 0, AV_OPT_TYPE_CONST, { .i64 = 2 }, INT_MIN, INT_MAX, VE, .unit = "pred" },
464
465 { NULL},
466 };
467
468 static const AVClass jpegls_class = {
469 .class_name = "jpegls",
470 .item_name = av_default_item_name,
471 .option = options,
472 .version = LIBAVUTIL_VERSION_INT,
473 };
474
475 const FFCodec ff_jpegls_encoder = {
476 .p.name = "jpegls",
477 CODEC_LONG_NAME("JPEG-LS"),
478 .p.type = AVMEDIA_TYPE_VIDEO,
479 .p.id = AV_CODEC_ID_JPEGLS,
480 .p.capabilities = AV_CODEC_CAP_DR1 | AV_CODEC_CAP_FRAME_THREADS |
481 AV_CODEC_CAP_ENCODER_REORDERED_OPAQUE,
482 .priv_data_size = sizeof(JPEGLSContext),
483 .p.priv_class = &jpegls_class,
484 .init = encode_jpegls_init,
485 FF_CODEC_ENCODE_CB(encode_picture_ls),
486 .close = encode_jpegls_close,
487 CODEC_PIXFMTS(AV_PIX_FMT_BGR24, AV_PIX_FMT_RGB24,
488 AV_PIX_FMT_GRAY8, AV_PIX_FMT_GRAY16),
489 .caps_internal = FF_CODEC_CAP_INIT_CLEANUP,
490 };
491