FFmpeg coverage

Directory: ../../../ffmpeg/
File: src/libavcodec/lagarith.c
Date: 2026-05-03 13:33:45
Exec Total Coverage
Lines: 282 387 72.9%
Functions: 13 14 92.9%
Branches: 137 210 65.2%
Line Branch Exec Source
1 /*
2 * Lagarith lossless decoder
3 * Copyright (c) 2009 Nathan Caldwell <saintdev (at) gmail.com>
4 *
5 * This file is part of FFmpeg.
6 *
7 * FFmpeg is free software; you can redistribute it and/or
8 * modify it under the terms of the GNU Lesser General Public
9 * License as published by the Free Software Foundation; either
10 * version 2.1 of the License, or (at your option) any later version.
11 *
12 * FFmpeg is distributed in the hope that it will be useful,
13 * but WITHOUT ANY WARRANTY; without even the implied warranty of
14 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
15 * Lesser General Public License for more details.
16 *
17 * You should have received a copy of the GNU Lesser General Public
18 * License along with FFmpeg; if not, write to the Free Software
19 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
20 */
21
22 /**
23 * @file
24 * Lagarith lossless decoder
25 * @author Nathan Caldwell
26 */
27
28 #include <inttypes.h>
29
30 #include "libavutil/attributes.h"
31 #include "libavutil/thread.h"
32
33 #include "avcodec.h"
34 #include "codec_internal.h"
35 #include "get_bits.h"
36 #include "mathops.h"
37 #include "lagarithrac.h"
38 #include "lossless_videodsp.h"
39 #include "thread.h"
40
41 #define VLC_BITS 7
42
43 enum LagarithFrameType {
44 FRAME_RAW = 1, /**< uncompressed */
45 FRAME_U_RGB24 = 2, /**< unaligned RGB24 */
46 FRAME_ARITH_YUY2 = 3, /**< arithmetic coded YUY2 */
47 FRAME_ARITH_RGB24 = 4, /**< arithmetic coded RGB24 */
48 FRAME_SOLID_GRAY = 5, /**< solid grayscale color frame */
49 FRAME_SOLID_COLOR = 6, /**< solid non-grayscale color frame */
50 FRAME_OLD_ARITH_RGB = 7, /**< obsolete arithmetic coded RGB (no longer encoded by upstream since version 1.1.0) */
51 FRAME_ARITH_RGBA = 8, /**< arithmetic coded RGBA */
52 FRAME_SOLID_RGBA = 9, /**< solid RGBA color frame */
53 FRAME_ARITH_YV12 = 10, /**< arithmetic coded YV12 */
54 FRAME_REDUCED_RES = 11, /**< reduced resolution YV12 frame */
55 };
56
57 typedef struct LagarithContext {
58 AVCodecContext *avctx;
59 LLVidDSPContext llviddsp;
60 int zeros; /**< number of consecutive zero bytes encountered */
61 int zeros_rem; /**< number of zero bytes remaining to output */
62 } LagarithContext;
63
64 static VLCElem lag_tab[1 << VLC_BITS];
65
66 static const uint8_t lag_bits[] = {
67 7, 7, 2, 7, 3, 4, 5, 6, 7, 7, 7, 7, 7, 6, 7, 4, 5, 7, 7, 7, 7,
68 5, 6, 7, 7, 7, 7, 7, 7, 6, 7, 7, 7, 7, 7, 6, 7, 7, 7, 7, 7, 7, 7,
69 7, 7, 7, 7, 7, 7, 7, 7, 7, 7,
70 };
71
72 static const uint8_t lag_codes[] = {
73 0x01, 0x02, 0x03, 0x03, 0x03, 0x03, 0x03, 0x03, 0x04, 0x05,
74 0x08, 0x09, 0x0A, 0x0B, 0x0B, 0x0B, 0x0B, 0x10, 0x11, 0x12, 0x13,
75 0x13, 0x13, 0x14, 0x15, 0x20, 0x21, 0x22, 0x23, 0x23, 0x24, 0x25,
76 0x28, 0x29, 0x2A, 0x2B, 0x2B, 0x40, 0x41, 0x42, 0x43, 0x44, 0x45,
77 0x48, 0x49, 0x4A, 0x4B, 0x50, 0x51, 0x52, 0x53, 0x54, 0x55,
78 };
79
80 static const uint8_t lag_symbols[] = {
81 20, 12, 0, 12, 1, 2, 4, 7, 7, 28, 4, 25, 17,
82 10, 17, 3, 6, 2, 23, 15, 15, 5, 9, 10, 31, 1, 22,
83 14, 14, 8, 9, 30, 6, 27, 19, 11, 19, 0, 21, 13, 13,
84 8, 29, 5, 26, 18, 18, 3, 24, 16, 16, 11, 32,
85 };
86
87 9 static av_cold void lag_init_static_data(void)
88 {
89 9 VLC_INIT_STATIC_SPARSE_TABLE(lag_tab, VLC_BITS, FF_ARRAY_ELEMS(lag_bits),
90 lag_bits, 1, 1, lag_codes, 1, 1, lag_symbols, 1, 1, 0);
91 9 }
92
93 /**
94 * Compute the 52-bit mantissa of 1/(double)denom.
95 * This crazy format uses floats in an entropy coder and we have to match x86
96 * rounding exactly, thus ordinary floats aren't portable enough.
97 * @param denom denominator
98 * @return 52-bit mantissa
99 * @see softfloat_mul
100 */
101 124 static uint64_t softfloat_reciprocal(uint32_t denom)
102 {
103 124 int shift = av_log2(denom - 1) + 1;
104 124 uint64_t ret = (1ULL << 52) / denom;
105 124 uint64_t err = (1ULL << 52) - ret * denom;
106 124 ret <<= shift;
107 124 err <<= shift;
108 124 err += denom / 2;
109 124 return ret + err / denom;
110 }
111
112 /**
113 * (uint32_t)(x*f), where f has the given mantissa, and exponent 0
114 * Used in combination with softfloat_reciprocal computes x/(double)denom.
115 * @param x 32-bit integer factor
116 * @param mantissa mantissa of f with exponent 0
117 * @return 32-bit integer value (x*f)
118 * @see softfloat_reciprocal
119 */
120 31744 static uint32_t softfloat_mul(uint32_t x, uint64_t mantissa)
121 {
122 31744 uint64_t l = x * (mantissa & 0xffffffff);
123 31744 uint64_t h = x * (mantissa >> 32);
124 31744 h += l >> 32;
125 31744 l &= 0xffffffff;
126 31744 l += 1LL << av_log2(h >> 21);
127 31744 h += l >> 32;
128 31744 return h >> 20;
129 }
130
131 462516 static uint8_t lag_calc_zero_run(int8_t x)
132 {
133 462516 return (x * 2) ^ (x >> 7);
134 }
135
136 21140 static int lag_decode_prob(GetBitContext *gb, uint32_t *value)
137 {
138 unsigned val, bits;
139
140 21140 bits = get_vlc2(gb, lag_tab, VLC_BITS, 1);
141
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 21140 if (bits > 31) {
142 ✗ *value = 0;
143 ✗ return AVERROR_INVALIDDATA;
144
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 21140 } else if (bits == 0) {
145 3841 *value = 0;
146 3841 return 0;
147 }
148
149 17299 val = get_bits_long(gb, bits);
150 17299 val |= 1U << bits;
151
152 17299 *value = val - 1;
153
154 17299 return 0;
155 }
156
157 126 static int lag_read_prob_header(lag_rac *rac, GetBitContext *gb)
158 {
159 int i, j, scale_factor;
160 unsigned prob, cumulative_target;
161 126 unsigned cumul_prob = 0;
162 126 unsigned scaled_cumul_prob = 0;
163 126 int nnz = 0;
164
165 126 rac->prob[0] = 0;
166 126 rac->prob[257] = UINT_MAX;
167 /* Read probabilities from bitstream */
168
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 18610 for (i = 1; i < 257; i++) {
169
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 18484 if (lag_decode_prob(gb, &rac->prob[i]) < 0) {
170 ✗ av_log(rac->logctx, AV_LOG_ERROR, "Invalid probability encountered.\n");
171 ✗ return AVERROR_INVALIDDATA;
172 }
173
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 18484 if ((uint64_t)cumul_prob + rac->prob[i] > UINT_MAX) {
174 ✗ av_log(rac->logctx, AV_LOG_ERROR, "Integer overflow encountered in cumulative probability calculation.\n");
175 ✗ return AVERROR_INVALIDDATA;
176 }
177 18484 cumul_prob += rac->prob[i];
178
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 18484 if (!rac->prob[i]) {
179
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 2656 if (lag_decode_prob(gb, &prob)) {
180 ✗ av_log(rac->logctx, AV_LOG_ERROR, "Invalid probability run encountered.\n");
181 ✗ return AVERROR_INVALIDDATA;
182 }
183
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 2656 if (prob > 256 - i)
184 ✗ prob = 256 - i;
185
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 16428 for (j = 0; j < prob; j++)
186 13772 rac->prob[++i] = 0;
187 }else {
188 15828 nnz++;
189 }
190 }
191
192
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 126 if (!cumul_prob) {
193 ✗ av_log(rac->logctx, AV_LOG_ERROR, "All probabilities are 0!\n");
194 ✗ return AVERROR_INVALIDDATA;
195 }
196
197
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 126 if (nnz == 1 && (show_bits_long(gb, 32) & 0xFFFFFF)) {
198 ✗ return AVERROR_INVALIDDATA;
199 }
200
201 /* Scale probabilities so cumulative probability is an even power of 2. */
202 126 scale_factor = av_log2(cumul_prob);
203
204
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 126 if (cumul_prob & (cumul_prob - 1)) {
205 124 uint64_t mul = softfloat_reciprocal(cumul_prob);
206
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 15996 for (i = 1; i <= 128; i++) {
207 15872 rac->prob[i] = softfloat_mul(rac->prob[i], mul);
208 15872 scaled_cumul_prob += rac->prob[i];
209 }
210
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 124 if (scaled_cumul_prob <= 0) {
211 ✗ av_log(rac->logctx, AV_LOG_ERROR, "Scaled probabilities invalid\n");
212 ✗ return AVERROR_INVALIDDATA;
213 }
214
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 15996 for (; i < 257; i++) {
215 15872 rac->prob[i] = softfloat_mul(rac->prob[i], mul);
216 15872 scaled_cumul_prob += rac->prob[i];
217 }
218
219 124 scale_factor++;
220
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 124 if (scale_factor >= 32U)
221 ✗ return AVERROR_INVALIDDATA;
222 124 cumulative_target = 1U << scale_factor;
223
224
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 124 if (scaled_cumul_prob > cumulative_target) {
225 ✗ av_log(rac->logctx, AV_LOG_ERROR,
226 "Scaled probabilities are larger than target!\n");
227 ✗ return AVERROR_INVALIDDATA;
228 }
229
230 124 scaled_cumul_prob = cumulative_target - scaled_cumul_prob;
231
232
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 12875 for (i = 1; scaled_cumul_prob; i = (i & 0x7f) + 1) {
233
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 12751 if (rac->prob[i]) {
234 7341 rac->prob[i]++;
235 7341 scaled_cumul_prob--;
236 }
237 /* Comment from reference source:
238 * if (b & 0x80 == 0) { // order of operations is 'wrong'; it has been left this way
239 * // since the compression change is negligible and fixing it
240 * // breaks backwards compatibility
241 * b =- (signed int)b;
242 * b &= 0xFF;
243 * } else {
244 * b++;
245 * b &= 0x7f;
246 * }
247 */
248 }
249 }
250
251
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 126 if (scale_factor > 23)
252 ✗ return AVERROR_INVALIDDATA;
253
254 126 rac->scale = scale_factor;
255
256 /* Fill probability array with cumulative probability for each symbol. */
257
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 32382 for (i = 1; i < 257; i++)
258 32256 rac->prob[i] += rac->prob[i - 1];
259
260 126 return 0;
261 }
262
263 49320 static void add_lag_median_prediction(uint8_t *dst, uint8_t *src1,
264 uint8_t *diff, int w, int *left,
265 int *left_top)
266 {
267 /* This is almost identical to add_hfyu_median_pred in huffyuvdsp.h.
268 * However the &0xFF on the gradient predictor yields incorrect output
269 * for lagarith.
270 */
271 int i;
272 uint8_t l, lt;
273
274 49320 l = *left;
275 49320 lt = *left_top;
276
277
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 33426824 for (i = 0; i < w; i++) {
278 33377504 l = mid_pred(l, src1[i], l + src1[i] - lt) + diff[i];
279 33377504 lt = src1[i];
280 33377504 dst[i] = l;
281 }
282
283 49320 *left = l;
284 49320 *left_top = lt;
285 49320 }
286
287 49440 static void lag_pred_line(LagarithContext *l, uint8_t *buf,
288 int width, int stride, int line)
289 {
290 int L, TL;
291
292
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 49440 if (!line) {
293 /* Left prediction only for first line */
294 120 L = l->llviddsp.add_left_pred(buf, buf, width, 0);
295 } else {
296 /* Left pixel is actually prev_row[width] */
297 49320 L = buf[width - stride - 1];
298
299
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 49320 if (line == 1) {
300 /* Second line, left predict first pixel, the rest of the line is median predicted
301 * NOTE: In the case of RGB this pixel is top predicted */
302
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 120 TL = l->avctx->pix_fmt == AV_PIX_FMT_YUV420P ? buf[-stride] : L;
303 } else {
304 /* Top left is 2 rows back, last pixel */
305 49200 TL = buf[width - (2 * stride) - 1];
306 }
307
308 49320 add_lag_median_prediction(buf, buf - stride, buf,
309 width, &L, &TL);
310 }
311 49440 }
312
313 4608 static void lag_pred_line_yuy2(LagarithContext *l, uint8_t *buf,
314 int width, int stride, int line,
315 int is_luma)
316 {
317 int L, TL;
318
319
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 4608 if (!line) {
320 6 L= buf[0];
321
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 6 if (is_luma)
322 2 buf[0] = 0;
323 6 l->llviddsp.add_left_pred(buf, buf, width, 0);
324
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 6 if (is_luma)
325 2 buf[0] = L;
326 6 return;
327 }
328
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 4602 if (line == 1) {
329
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 6 const int HEAD = is_luma ? 4 : 2;
330 int i;
331
332 6 L = buf[width - stride - 1];
333 6 TL = buf[HEAD - stride - 1];
334
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 22 for (i = 0; i < HEAD; i++) {
335 16 L += buf[i];
336 16 buf[i] = L;
337 }
338
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 4086 for (; i < width; i++) {
339 4080 L = mid_pred(L & 0xFF, buf[i - stride], (L + buf[i - stride] - TL) & 0xFF) + buf[i];
340 4080 TL = buf[i - stride];
341 4080 buf[i] = L;
342 }
343 } else {
344 4596 TL = buf[width - (2 * stride) - 1];
345 4596 L = buf[width - stride - 1];
346 4596 l->llviddsp.add_median_pred(buf, buf - stride, buf, width, &L, &TL);
347 }
348 }
349
350 54048 static int lag_decode_line(LagarithContext *l, lag_rac *rac,
351 uint8_t *dst, int width, int stride,
352 int esc_count)
353 {
354 54048 int i = 0;
355 54048 int ret = 0;
356
357
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 54048 if (!esc_count)
358 1656 esc_count = -1;
359
360 /* Output any zeros remaining from the previous run */
361 54048 handle_zeros:
362
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 516564 if (l->zeros_rem) {
363 376521 int count = FFMIN(l->zeros_rem, width - i);
364 376521 memset(dst + i, 0, count);
365 376521 i += count;
366 376521 l->zeros_rem -= count;
367 }
368
369
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 4201623 while (i < width) {
370 4147575 dst[i] = lag_get_rac(rac);
371 4147575 ret++;
372
373
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 4147575 if (dst[i])
374 2802454 l->zeros = 0;
375 else
376 1345121 l->zeros++;
377
378 4147575 i++;
379
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 4147575 if (l->zeros == esc_count) {
380 462516 int index = lag_get_rac(rac);
381 462516 ret++;
382
383 462516 l->zeros = 0;
384
385 462516 l->zeros_rem = lag_calc_zero_run(index);
386 462516 goto handle_zeros;
387 }
388 }
389 54048 return ret;
390 }
391
392 ✗ static int lag_decode_zero_run_line(LagarithContext *l, uint8_t *dst,
393 const uint8_t *src, const uint8_t *src_end,
394 int width, int esc_count)
395 {
396 ✗ int i = 0;
397 int count;
398 ✗ uint8_t zero_run = 0;
399 ✗ const uint8_t *src_start = src;
400 ✗ uint8_t mask1 = -(esc_count < 2);
401 ✗ uint8_t mask2 = -(esc_count < 3);
402 ✗ uint8_t *end = dst + (width - 2);
403
404 ✗ avpriv_request_sample(l->avctx, "zero_run_line");
405
406 ✗ memset(dst, 0, width);
407
408 ✗ output_zeros:
409 ✗ if (l->zeros_rem) {
410 ✗ count = FFMIN(l->zeros_rem, width - i);
411 ✗ if (end - dst < count) {
412 ✗ av_log(l->avctx, AV_LOG_ERROR, "Too many zeros remaining.\n");
413 ✗ return AVERROR_INVALIDDATA;
414 }
415
416 ✗ memset(dst, 0, count);
417 ✗ l->zeros_rem -= count;
418 ✗ dst += count;
419 }
420
421 ✗ while (dst < end) {
422 ✗ i = 0;
423 ✗ while (!zero_run && dst + i < end) {
424 ✗ i++;
425 ✗ if (i+2 >= src_end - src)
426 ✗ return AVERROR_INVALIDDATA;
427 ✗ zero_run =
428 ✗ !(src[i] | (src[i + 1] & mask1) | (src[i + 2] & mask2));
429 }
430 ✗ if (zero_run) {
431 ✗ zero_run = 0;
432 ✗ i += esc_count;
433 ✗ if (i > end - dst ||
434 ✗ i >= src_end - src)
435 ✗ return AVERROR_INVALIDDATA;
436 ✗ memcpy(dst, src, i);
437 ✗ dst += i;
438 ✗ l->zeros_rem = lag_calc_zero_run(src[i]);
439
440 ✗ src += i + 1;
441 ✗ goto output_zeros;
442 } else {
443 ✗ memcpy(dst, src, i);
444 ✗ src += i;
445 ✗ dst += i;
446 }
447 }
448 ✗ return src - src_start;
449 }
450
451
452
453 134 static int lag_decode_arith_plane(LagarithContext *l, uint8_t *dst,
454 int width, int height, int stride,
455 const uint8_t *src, int src_size)
456 {
457 134 int i = 0;
458 134 int read = 0;
459 uint32_t length;
460 134 uint32_t offset = 1;
461 int esc_count;
462 GetBitContext gb;
463 lag_rac rac;
464 134 const uint8_t *src_end = src + src_size;
465 int ret;
466
467 134 rac.logctx = l->avctx;
468 134 l->zeros = 0;
469
470
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 134 if(src_size < 2)
471 ✗ return AVERROR_INVALIDDATA;
472
473 134 esc_count = src[0];
474
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 134 if (esc_count < 4) {
475 126 length = width * height;
476
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 126 if(src_size < 5)
477 ✗ return AVERROR_INVALIDDATA;
478
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 126 if (esc_count && AV_RL32(src + 1) < length) {
479 123 length = AV_RL32(src + 1);
480 123 offset += 4;
481 }
482
483
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 126 if ((ret = init_get_bits8(&gb, src + offset, src_size - offset)) < 0)
484 ✗ return ret;
485
486
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 126 if ((ret = lag_read_prob_header(&rac, &gb)) < 0)
487 ✗ return ret;
488
489 126 ff_lag_rac_init(&rac, &gb, length - stride);
490
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 54174 for (i = 0; i < height; i++) {
491
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 54048 if (rac.overread > MAX_OVERREAD)
492 ✗ return AVERROR_INVALIDDATA;
493 54048 read += lag_decode_line(l, &rac, dst + (i * stride), width,
494 stride, esc_count);
495 }
496
497
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 126 if (read > length)
498 ✗ av_log(l->avctx, AV_LOG_WARNING,
499 "Output more bytes than length (%d of %"PRIu32")\n", read,
500 length);
501
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 8 } else if (esc_count < 8) {
502 ✗ esc_count -= 4;
503 ✗ src ++;
504 ✗ src_size --;
505 ✗ if (esc_count > 0) {
506 /* Zero run coding only, no range coding. */
507 ✗ for (i = 0; i < height; i++) {
508 ✗ int res = lag_decode_zero_run_line(l, dst + (i * stride), src,
509 src_end, width, esc_count);
510 ✗ if (res < 0)
511 ✗ return res;
512 ✗ src += res;
513 }
514 } else {
515 ✗ if (src_size < width * height)
516 ✗ return AVERROR_INVALIDDATA; // buffer not big enough
517 /* Plane is stored uncompressed */
518 ✗ for (i = 0; i < height; i++) {
519 ✗ memcpy(dst + (i * stride), src, width);
520 ✗ src += width;
521 }
522 }
523
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 8 } else if (esc_count == 0xff) {
524 /* Plane is a solid run of given value */
525
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 2888 for (i = 0; i < height; i++)
526 2880 memset(dst + i * stride, src[1], width);
527 /* Do not apply prediction.
528 Note: memset to 0 above, setting first value to src[1]
529 and applying prediction gives the same result. */
530 8 return 0;
531 } else {
532 ✗ av_log(l->avctx, AV_LOG_ERROR,
533 "Invalid zero run escape code! (%#x)\n", esc_count);
534 ✗ return AVERROR_INVALIDDATA;
535 }
536
537
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 126 if (l->avctx->pix_fmt != AV_PIX_FMT_YUV422P) {
538
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 49560 for (i = 0; i < height; i++) {
539 49440 lag_pred_line(l, dst, width, stride, i);
540 49440 dst += stride;
541 }
542 } else {
543
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 4614 for (i = 0; i < height; i++) {
544 4608 lag_pred_line_yuy2(l, dst, width, stride, i,
545 4608 width == l->avctx->width);
546 4608 dst += stride;
547 }
548 }
549
550 126 return 0;
551 }
552
553 /**
554 * Decode a frame.
555 * @param avctx codec context
556 * @param data output AVFrame
557 * @param data_size size of output data or 0 if no picture is returned
558 * @param avpkt input packet
559 * @return number of consumed bytes on success or negative if decode fails
560 */
561 78 static int lag_decode_frame(AVCodecContext *avctx, AVFrame *p,
562 int *got_frame, AVPacket *avpkt)
563 {
564 78 const uint8_t *buf = avpkt->data;
565 78 unsigned int buf_size = avpkt->size;
566 78 LagarithContext *l = avctx->priv_data;
567 uint8_t frametype;
568 78 uint32_t offset_gu = 0, offset_bv = 0, offset_ry = 9;
569 uint32_t offs[4];
570 uint8_t *srcs[4];
571 78 int i, j, planes = 3;
572 78 int ret = 0;
573
574 78 frametype = buf[0];
575
576 78 offset_gu = AV_RL32(buf + 1);
577 78 offset_bv = AV_RL32(buf + 5);
578
579
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 78 switch (frametype) {
580 6 case FRAME_SOLID_RGBA:
581 6 avctx->pix_fmt = AV_PIX_FMT_GBRAP;
582 av_fallthrough;
583 14 case FRAME_SOLID_GRAY:
584
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 14 if (frametype == FRAME_SOLID_GRAY)
585
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 8 if (avctx->bits_per_coded_sample == 24) {
586 8 avctx->pix_fmt = AV_PIX_FMT_GBRP;
587 } else {
588 ✗ avctx->pix_fmt = AV_PIX_FMT_GBRAP;
589 ✗ planes = 4;
590 }
591
592
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 14 if ((ret = ff_thread_get_buffer(avctx, p, 0)) < 0)
593 ✗ return ret;
594
595
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 14 if (frametype == FRAME_SOLID_RGBA) {
596
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 2886 for (i = 0; i < avctx->height; i++) {
597 2880 memset(p->data[0] + i * p->linesize[0], buf[2], avctx->width);
598 2880 memset(p->data[1] + i * p->linesize[1], buf[1], avctx->width);
599 2880 memset(p->data[2] + i * p->linesize[2], buf[3], avctx->width);
600 2880 memset(p->data[3] + i * p->linesize[3], buf[4], avctx->width);
601 }
602 } else {
603
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 2888 for (i = 0; i < avctx->height; i++) {
604
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 11520 for (j = 0; j < planes; j++)
605 8640 memset(p->data[j] + i * p->linesize[j], buf[1], avctx->width);
606 }
607 }
608 14 break;
609 26 case FRAME_SOLID_COLOR:
610
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 26 if (avctx->bits_per_coded_sample == 24) {
611 26 avctx->pix_fmt = AV_PIX_FMT_GBRP;
612 } else {
613 ✗ avctx->pix_fmt = AV_PIX_FMT_GBRAP;
614 }
615
616
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 26 if ((ret = ff_thread_get_buffer(avctx, p,0)) < 0)
617 ✗ return ret;
618
619
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 6266 for (i = 0; i < avctx->height; i++) {
620 6240 memset(p->data[0] + i * p->linesize[0], buf[2], avctx->width);
621 6240 memset(p->data[1] + i * p->linesize[1], buf[1], avctx->width);
622 6240 memset(p->data[2] + i * p->linesize[2], buf[3], avctx->width);
623
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 6240 if (avctx->pix_fmt == AV_PIX_FMT_GBRAP)
624 ✗ memset(p->data[3] + i * p->linesize[3], 0xFFu, avctx->width);
625 }
626 26 break;
627 20 case FRAME_ARITH_RGBA:
628 20 avctx->pix_fmt = AV_PIX_FMT_GBRAP;
629 20 planes = 4;
630 20 offset_ry += 4;
631 20 offs[3] = AV_RL32(buf + 9);
632 av_fallthrough;
633 33 case FRAME_ARITH_RGB24:
634 case FRAME_U_RGB24:
635
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 33 if (frametype == FRAME_ARITH_RGB24 || frametype == FRAME_U_RGB24)
636 13 avctx->pix_fmt = AV_PIX_FMT_GBRP;
637
638
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 33 if ((ret = ff_thread_get_buffer(avctx, p, 0)) < 0)
639 ✗ return ret;
640
641 33 offs[0] = offset_bv;
642 33 offs[1] = offset_gu;
643 33 offs[2] = offset_ry;
644
645
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 152 for (i = 0; i < planes; i++)
646 119 srcs[i] = p->data[i] + (avctx->height - 1) * p->linesize[i];
647
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 152 for (i = 0; i < planes; i++)
648
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 119 if (buf_size <= offs[i]) {
649 ✗ av_log(avctx, AV_LOG_ERROR,
650 "Invalid frame offsets\n");
651 ✗ return AVERROR_INVALIDDATA;
652 }
653
654
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 152 for (i = 0; i < planes; i++) {
655 119 ret = lag_decode_arith_plane(l, srcs[i],
656 avctx->width, avctx->height,
657 119 -p->linesize[i], buf + offs[i],
658 119 buf_size - offs[i]);
659
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 119 if (ret < 0)
660 ✗ return ret;
661 }
662
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 13793 for (i = 0; i < avctx->height; i++) {
663 13760 l->llviddsp.add_bytes(p->data[0] + i * p->linesize[0], p->data[1] + i * p->linesize[1], avctx->width);
664 13760 l->llviddsp.add_bytes(p->data[2] + i * p->linesize[2], p->data[1] + i * p->linesize[1], avctx->width);
665 }
666 33 FFSWAP(uint8_t*, p->data[0], p->data[1]);
667 33 FFSWAP(int, p->linesize[0], p->linesize[1]);
668 33 FFSWAP(uint8_t*, p->data[2], p->data[1]);
669 33 FFSWAP(int, p->linesize[2], p->linesize[1]);
670 33 break;
671 2 case FRAME_ARITH_YUY2:
672 2 avctx->pix_fmt = AV_PIX_FMT_YUV422P;
673
674
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 2 if ((ret = ff_thread_get_buffer(avctx, p, 0)) < 0)
675 ✗ return ret;
676
677
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 2 if (offset_ry >= buf_size ||
678
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 2 offset_gu >= buf_size ||
679 offset_bv >= buf_size) {
680 ✗ av_log(avctx, AV_LOG_ERROR,
681 "Invalid frame offsets\n");
682 ✗ return AVERROR_INVALIDDATA;
683 }
684
685 2 ret = lag_decode_arith_plane(l, p->data[0], avctx->width, avctx->height,
686 p->linesize[0], buf + offset_ry,
687 2 buf_size - offset_ry);
688
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 2 if (ret < 0)
689 ✗ return ret;
690 2 ret = lag_decode_arith_plane(l, p->data[1], (avctx->width + 1) / 2,
691 avctx->height, p->linesize[1],
692 2 buf + offset_gu, buf_size - offset_gu);
693
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 2 if (ret < 0)
694 ✗ return ret;
695 2 ret = lag_decode_arith_plane(l, p->data[2], (avctx->width + 1) / 2,
696 avctx->height, p->linesize[2],
697 2 buf + offset_bv, buf_size - offset_bv);
698 2 break;
699 3 case FRAME_ARITH_YV12:
700 3 avctx->pix_fmt = AV_PIX_FMT_YUV420P;
701
702
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 3 if ((ret = ff_thread_get_buffer(avctx, p, 0)) < 0)
703 ✗ return ret;
704
705
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706
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 3 offset_gu >= buf_size ||
707 offset_bv >= buf_size) {
708 ✗ av_log(avctx, AV_LOG_ERROR,
709 "Invalid frame offsets\n");
710 ✗ return AVERROR_INVALIDDATA;
711 }
712
713 3 ret = lag_decode_arith_plane(l, p->data[0], avctx->width, avctx->height,
714 p->linesize[0], buf + offset_ry,
715 3 buf_size - offset_ry);
716
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 3 if (ret < 0)
717 ✗ return ret;
718 3 ret = lag_decode_arith_plane(l, p->data[2], (avctx->width + 1) / 2,
719 3 (avctx->height + 1) / 2, p->linesize[2],
720 3 buf + offset_gu, buf_size - offset_gu);
721
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 3 if (ret < 0)
722 ✗ return ret;
723 3 ret = lag_decode_arith_plane(l, p->data[1], (avctx->width + 1) / 2,
724 3 (avctx->height + 1) / 2, p->linesize[1],
725 3 buf + offset_bv, buf_size - offset_bv);
726 3 break;
727 ✗ default:
728 ✗ av_log(avctx, AV_LOG_ERROR,
729 "Unsupported Lagarith frame type: %#"PRIx8"\n", frametype);
730 ✗ return AVERROR_PATCHWELCOME;
731 }
732
733
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 78 if (ret < 0)
734 ✗ return ret;
735
736 78 *got_frame = 1;
737
738 78 return buf_size;
739 }
740
741 18 static av_cold int lag_decode_init(AVCodecContext *avctx)
742 {
743 static AVOnce init_static_once = AV_ONCE_INIT;
744 18 LagarithContext *l = avctx->priv_data;
745 18 l->avctx = avctx;
746
747 18 ff_llviddsp_init(&l->llviddsp);
748 18 ff_thread_once(&init_static_once, lag_init_static_data);
749
750 18 return 0;
751 }
752
753 const FFCodec ff_lagarith_decoder = {
754 .p.name = "lagarith",
755 CODEC_LONG_NAME("Lagarith lossless"),
756 .p.type = AVMEDIA_TYPE_VIDEO,
757 .p.id = AV_CODEC_ID_LAGARITH,
758 .priv_data_size = sizeof(LagarithContext),
759 .init = lag_decode_init,
760 FF_CODEC_DECODE_CB(lag_decode_frame),
761 .p.capabilities = AV_CODEC_CAP_DR1 | AV_CODEC_CAP_FRAME_THREADS,
762 };
763