FFmpeg coverage


Directory: ../../../ffmpeg/
File: src/libavcodec/lagarith.c
Date: 2021-09-22 05:58:22
Exec Total Coverage
Lines: 285 381 74.8%
Branches: 142 206 68.9%

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 "avcodec.h"
31 #include "get_bits.h"
32 #include "internal.h"
33 #include "mathops.h"
34 #include "lagarithrac.h"
35 #include "lossless_videodsp.h"
36 #include "thread.h"
37
38 enum LagarithFrameType {
39 FRAME_RAW = 1, /**< uncompressed */
40 FRAME_U_RGB24 = 2, /**< unaligned RGB24 */
41 FRAME_ARITH_YUY2 = 3, /**< arithmetic coded YUY2 */
42 FRAME_ARITH_RGB24 = 4, /**< arithmetic coded RGB24 */
43 FRAME_SOLID_GRAY = 5, /**< solid grayscale color frame */
44 FRAME_SOLID_COLOR = 6, /**< solid non-grayscale color frame */
45 FRAME_OLD_ARITH_RGB = 7, /**< obsolete arithmetic coded RGB (no longer encoded by upstream since version 1.1.0) */
46 FRAME_ARITH_RGBA = 8, /**< arithmetic coded RGBA */
47 FRAME_SOLID_RGBA = 9, /**< solid RGBA color frame */
48 FRAME_ARITH_YV12 = 10, /**< arithmetic coded YV12 */
49 FRAME_REDUCED_RES = 11, /**< reduced resolution YV12 frame */
50 };
51
52 typedef struct LagarithContext {
53 AVCodecContext *avctx;
54 LLVidDSPContext llviddsp;
55 int zeros; /**< number of consecutive zero bytes encountered */
56 int zeros_rem; /**< number of zero bytes remaining to output */
57 } LagarithContext;
58
59 /**
60 * Compute the 52-bit mantissa of 1/(double)denom.
61 * This crazy format uses floats in an entropy coder and we have to match x86
62 * rounding exactly, thus ordinary floats aren't portable enough.
63 * @param denom denominator
64 * @return 52-bit mantissa
65 * @see softfloat_mul
66 */
67 124 static uint64_t softfloat_reciprocal(uint32_t denom)
68 {
69 124 int shift = av_log2(denom - 1) + 1;
70 124 uint64_t ret = (1ULL << 52) / denom;
71 124 uint64_t err = (1ULL << 52) - ret * denom;
72 124 ret <<= shift;
73 124 err <<= shift;
74 124 err += denom / 2;
75 124 return ret + err / denom;
76 }
77
78 /**
79 * (uint32_t)(x*f), where f has the given mantissa, and exponent 0
80 * Used in combination with softfloat_reciprocal computes x/(double)denom.
81 * @param x 32-bit integer factor
82 * @param mantissa mantissa of f with exponent 0
83 * @return 32-bit integer value (x*f)
84 * @see softfloat_reciprocal
85 */
86 31744 static uint32_t softfloat_mul(uint32_t x, uint64_t mantissa)
87 {
88 31744 uint64_t l = x * (mantissa & 0xffffffff);
89 31744 uint64_t h = x * (mantissa >> 32);
90 31744 h += l >> 32;
91 31744 l &= 0xffffffff;
92 31744 l += 1LL << av_log2(h >> 21);
93 31744 h += l >> 32;
94 31744 return h >> 20;
95 }
96
97 462516 static uint8_t lag_calc_zero_run(int8_t x)
98 {
99 462516 return (x * 2) ^ (x >> 7);
100 }
101
102 21140 static int lag_decode_prob(GetBitContext *gb, uint32_t *value)
103 {
104 static const uint8_t series[] = { 1, 2, 3, 5, 8, 13, 21 };
105 int i;
106 21140 int bit = 0;
107 21140 int bits = 0;
108 21140 int prevbit = 0;
109 unsigned val;
110
111
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97990 for (i = 0; i < 7; i++) {
112
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97888 if (prevbit && bit)
113 21038 break;
114 76850 prevbit = bit;
115 76850 bit = get_bits1(gb);
116
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76850 if (bit && !prevbit)
117 26585 bits += series[i];
118 }
119 21140 bits--;
120
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21140 if (bits < 0 || bits > 31) {
121 *value = 0;
122 return -1;
123
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21140 } else if (bits == 0) {
124 3841 *value = 0;
125 3841 return 0;
126 }
127
128 17299 val = get_bits_long(gb, bits);
129 17299 val |= 1U << bits;
130
131 17299 *value = val - 1;
132
133 17299 return 0;
134 }
135
136 126 static int lag_read_prob_header(lag_rac *rac, GetBitContext *gb)
137 {
138 int i, j, scale_factor;
139 unsigned prob, cumulative_target;
140 126 unsigned cumul_prob = 0;
141 126 unsigned scaled_cumul_prob = 0;
142 126 int nnz = 0;
143
144 126 rac->prob[0] = 0;
145 126 rac->prob[257] = UINT_MAX;
146 /* Read probabilities from bitstream */
147
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18610 for (i = 1; i < 257; i++) {
148
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18484 if (lag_decode_prob(gb, &rac->prob[i]) < 0) {
149 av_log(rac->avctx, AV_LOG_ERROR, "Invalid probability encountered.\n");
150 return -1;
151 }
152
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18484 if ((uint64_t)cumul_prob + rac->prob[i] > UINT_MAX) {
153 av_log(rac->avctx, AV_LOG_ERROR, "Integer overflow encountered in cumulative probability calculation.\n");
154 return -1;
155 }
156 18484 cumul_prob += rac->prob[i];
157
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18484 if (!rac->prob[i]) {
158
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2656 if (lag_decode_prob(gb, &prob)) {
159 av_log(rac->avctx, AV_LOG_ERROR, "Invalid probability run encountered.\n");
160 return -1;
161 }
162
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2656 if (prob > 256 - i)
163 prob = 256 - i;
164
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16428 for (j = 0; j < prob; j++)
165 13772 rac->prob[++i] = 0;
166 }else {
167 15828 nnz++;
168 }
169 }
170
171
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126 if (!cumul_prob) {
172 av_log(rac->avctx, AV_LOG_ERROR, "All probabilities are 0!\n");
173 return -1;
174 }
175
176
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126 if (nnz == 1 && (show_bits_long(gb, 32) & 0xFFFFFF)) {
177 return AVERROR_INVALIDDATA;
178 }
179
180 /* Scale probabilities so cumulative probability is an even power of 2. */
181 126 scale_factor = av_log2(cumul_prob);
182
183
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126 if (cumul_prob & (cumul_prob - 1)) {
184 124 uint64_t mul = softfloat_reciprocal(cumul_prob);
185
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15996 for (i = 1; i <= 128; i++) {
186 15872 rac->prob[i] = softfloat_mul(rac->prob[i], mul);
187 15872 scaled_cumul_prob += rac->prob[i];
188 }
189
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124 if (scaled_cumul_prob <= 0) {
190 av_log(rac->avctx, AV_LOG_ERROR, "Scaled probabilities invalid\n");
191 return AVERROR_INVALIDDATA;
192 }
193
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15996 for (; i < 257; i++) {
194 15872 rac->prob[i] = softfloat_mul(rac->prob[i], mul);
195 15872 scaled_cumul_prob += rac->prob[i];
196 }
197
198 124 scale_factor++;
199
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124 if (scale_factor >= 32U)
200 return AVERROR_INVALIDDATA;
201 124 cumulative_target = 1U << scale_factor;
202
203
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124 if (scaled_cumul_prob > cumulative_target) {
204 av_log(rac->avctx, AV_LOG_ERROR,
205 "Scaled probabilities are larger than target!\n");
206 return -1;
207 }
208
209 124 scaled_cumul_prob = cumulative_target - scaled_cumul_prob;
210
211
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12875 for (i = 1; scaled_cumul_prob; i = (i & 0x7f) + 1) {
212
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12751 if (rac->prob[i]) {
213 7341 rac->prob[i]++;
214 7341 scaled_cumul_prob--;
215 }
216 /* Comment from reference source:
217 * if (b & 0x80 == 0) { // order of operations is 'wrong'; it has been left this way
218 * // since the compression change is negligible and fixing it
219 * // breaks backwards compatibility
220 * b =- (signed int)b;
221 * b &= 0xFF;
222 * } else {
223 * b++;
224 * b &= 0x7f;
225 * }
226 */
227 }
228 }
229
230
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126 if (scale_factor > 23)
231 return AVERROR_INVALIDDATA;
232
233 126 rac->scale = scale_factor;
234
235 /* Fill probability array with cumulative probability for each symbol. */
236
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32382 for (i = 1; i < 257; i++)
237 32256 rac->prob[i] += rac->prob[i - 1];
238
239 126 return 0;
240 }
241
242 49320 static void add_lag_median_prediction(uint8_t *dst, uint8_t *src1,
243 uint8_t *diff, int w, int *left,
244 int *left_top)
245 {
246 /* This is almost identical to add_hfyu_median_pred in huffyuvdsp.h.
247 * However the &0xFF on the gradient predictor yields incorrect output
248 * for lagarith.
249 */
250 int i;
251 uint8_t l, lt;
252
253 49320 l = *left;
254 49320 lt = *left_top;
255
256
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33426824 for (i = 0; i < w; i++) {
257 33377504 l = mid_pred(l, src1[i], l + src1[i] - lt) + diff[i];
258 33377504 lt = src1[i];
259 33377504 dst[i] = l;
260 }
261
262 49320 *left = l;
263 49320 *left_top = lt;
264 49320 }
265
266 49440 static void lag_pred_line(LagarithContext *l, uint8_t *buf,
267 int width, int stride, int line)
268 {
269 int L, TL;
270
271
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49440 if (!line) {
272 /* Left prediction only for first line */
273 120 L = l->llviddsp.add_left_pred(buf, buf, width, 0);
274 } else {
275 /* Left pixel is actually prev_row[width] */
276 49320 L = buf[width - stride - 1];
277
278
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49320 if (line == 1) {
279 /* Second line, left predict first pixel, the rest of the line is median predicted
280 * NOTE: In the case of RGB this pixel is top predicted */
281
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120 TL = l->avctx->pix_fmt == AV_PIX_FMT_YUV420P ? buf[-stride] : L;
282 } else {
283 /* Top left is 2 rows back, last pixel */
284 49200 TL = buf[width - (2 * stride) - 1];
285 }
286
287 49320 add_lag_median_prediction(buf, buf - stride, buf,
288 width, &L, &TL);
289 }
290 49440 }
291
292 4608 static void lag_pred_line_yuy2(LagarithContext *l, uint8_t *buf,
293 int width, int stride, int line,
294 int is_luma)
295 {
296 int L, TL;
297
298
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4608 if (!line) {
299 6 L= buf[0];
300
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6 if (is_luma)
301 2 buf[0] = 0;
302 6 l->llviddsp.add_left_pred(buf, buf, width, 0);
303
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6 if (is_luma)
304 2 buf[0] = L;
305 6 return;
306 }
307
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4602 if (line == 1) {
308
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6 const int HEAD = is_luma ? 4 : 2;
309 int i;
310
311 6 L = buf[width - stride - 1];
312 6 TL = buf[HEAD - stride - 1];
313
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22 for (i = 0; i < HEAD; i++) {
314 16 L += buf[i];
315 16 buf[i] = L;
316 }
317
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4086 for (; i < width; i++) {
318 4080 L = mid_pred(L & 0xFF, buf[i - stride], (L + buf[i - stride] - TL) & 0xFF) + buf[i];
319 4080 TL = buf[i - stride];
320 4080 buf[i] = L;
321 }
322 } else {
323 4596 TL = buf[width - (2 * stride) - 1];
324 4596 L = buf[width - stride - 1];
325 4596 l->llviddsp.add_median_pred(buf, buf - stride, buf, width, &L, &TL);
326 }
327 }
328
329 54048 static int lag_decode_line(LagarithContext *l, lag_rac *rac,
330 uint8_t *dst, int width, int stride,
331 int esc_count)
332 {
333 54048 int i = 0;
334 54048 int ret = 0;
335
336
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54048 if (!esc_count)
337 1656 esc_count = -1;
338
339 /* Output any zeros remaining from the previous run */
340 52392 handle_zeros:
341
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516564 if (l->zeros_rem) {
342 376521 int count = FFMIN(l->zeros_rem, width - i);
343 376521 memset(dst + i, 0, count);
344 376521 i += count;
345 376521 l->zeros_rem -= count;
346 }
347
348
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4201623 while (i < width) {
349 4147575 dst[i] = lag_get_rac(rac);
350 4147575 ret++;
351
352
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4147575 if (dst[i])
353 2802454 l->zeros = 0;
354 else
355 1345121 l->zeros++;
356
357 4147575 i++;
358
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4147575 if (l->zeros == esc_count) {
359 462516 int index = lag_get_rac(rac);
360 462516 ret++;
361
362 462516 l->zeros = 0;
363
364 462516 l->zeros_rem = lag_calc_zero_run(index);
365 462516 goto handle_zeros;
366 }
367 }
368 54048 return ret;
369 }
370
371 static int lag_decode_zero_run_line(LagarithContext *l, uint8_t *dst,
372 const uint8_t *src, const uint8_t *src_end,
373 int width, int esc_count)
374 {
375 int i = 0;
376 int count;
377 uint8_t zero_run = 0;
378 const uint8_t *src_start = src;
379 uint8_t mask1 = -(esc_count < 2);
380 uint8_t mask2 = -(esc_count < 3);
381 uint8_t *end = dst + (width - 2);
382
383 avpriv_request_sample(l->avctx, "zero_run_line");
384
385 memset(dst, 0, width);
386
387 output_zeros:
388 if (l->zeros_rem) {
389 count = FFMIN(l->zeros_rem, width - i);
390 if (end - dst < count) {
391 av_log(l->avctx, AV_LOG_ERROR, "Too many zeros remaining.\n");
392 return AVERROR_INVALIDDATA;
393 }
394
395 memset(dst, 0, count);
396 l->zeros_rem -= count;
397 dst += count;
398 }
399
400 while (dst < end) {
401 i = 0;
402 while (!zero_run && dst + i < end) {
403 i++;
404 if (i+2 >= src_end - src)
405 return AVERROR_INVALIDDATA;
406 zero_run =
407 !(src[i] | (src[i + 1] & mask1) | (src[i + 2] & mask2));
408 }
409 if (zero_run) {
410 zero_run = 0;
411 i += esc_count;
412 memcpy(dst, src, i);
413 dst += i;
414 l->zeros_rem = lag_calc_zero_run(src[i]);
415
416 src += i + 1;
417 goto output_zeros;
418 } else {
419 memcpy(dst, src, i);
420 src += i;
421 dst += i;
422 }
423 }
424 return src - src_start;
425 }
426
427
428
429 134 static int lag_decode_arith_plane(LagarithContext *l, uint8_t *dst,
430 int width, int height, int stride,
431 const uint8_t *src, int src_size)
432 {
433 134 int i = 0;
434 134 int read = 0;
435 uint32_t length;
436 134 uint32_t offset = 1;
437 int esc_count;
438 GetBitContext gb;
439 lag_rac rac;
440 134 const uint8_t *src_end = src + src_size;
441 int ret;
442
443 134 rac.avctx = l->avctx;
444 134 l->zeros = 0;
445
446
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134 if(src_size < 2)
447 return AVERROR_INVALIDDATA;
448
449 134 esc_count = src[0];
450
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134 if (esc_count < 4) {
451 126 length = width * height;
452
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126 if(src_size < 5)
453 return AVERROR_INVALIDDATA;
454
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126 if (esc_count && AV_RL32(src + 1) < length) {
455 123 length = AV_RL32(src + 1);
456 123 offset += 4;
457 }
458
459
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126 if ((ret = init_get_bits8(&gb, src + offset, src_size - offset)) < 0)
460 return ret;
461
462
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126 if (lag_read_prob_header(&rac, &gb) < 0)
463 return -1;
464
465 126 ff_lag_rac_init(&rac, &gb, length - stride);
466
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54174 for (i = 0; i < height; i++) {
467
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54048 if (rac.overread > MAX_OVERREAD)
468 return AVERROR_INVALIDDATA;
469 54048 read += lag_decode_line(l, &rac, dst + (i * stride), width,
470 stride, esc_count);
471 }
472
473
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126 if (read > length)
474 av_log(l->avctx, AV_LOG_WARNING,
475 "Output more bytes than length (%d of %"PRIu32")\n", read,
476 length);
477
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8 } else if (esc_count < 8) {
478 esc_count -= 4;
479 src ++;
480 src_size --;
481 if (esc_count > 0) {
482 /* Zero run coding only, no range coding. */
483 for (i = 0; i < height; i++) {
484 int res = lag_decode_zero_run_line(l, dst + (i * stride), src,
485 src_end, width, esc_count);
486 if (res < 0)
487 return res;
488 src += res;
489 }
490 } else {
491 if (src_size < width * height)
492 return AVERROR_INVALIDDATA; // buffer not big enough
493 /* Plane is stored uncompressed */
494 for (i = 0; i < height; i++) {
495 memcpy(dst + (i * stride), src, width);
496 src += width;
497 }
498 }
499
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8 } else if (esc_count == 0xff) {
500 /* Plane is a solid run of given value */
501
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2888 for (i = 0; i < height; i++)
502 2880 memset(dst + i * stride, src[1], width);
503 /* Do not apply prediction.
504 Note: memset to 0 above, setting first value to src[1]
505 and applying prediction gives the same result. */
506 8 return 0;
507 } else {
508 av_log(l->avctx, AV_LOG_ERROR,
509 "Invalid zero run escape code! (%#x)\n", esc_count);
510 return -1;
511 }
512
513
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126 if (l->avctx->pix_fmt != AV_PIX_FMT_YUV422P) {
514
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49560 for (i = 0; i < height; i++) {
515 49440 lag_pred_line(l, dst, width, stride, i);
516 49440 dst += stride;
517 }
518 } else {
519
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4614 for (i = 0; i < height; i++) {
520 4608 lag_pred_line_yuy2(l, dst, width, stride, i,
521 4608 width == l->avctx->width);
522 4608 dst += stride;
523 }
524 }
525
526 126 return 0;
527 }
528
529 /**
530 * Decode a frame.
531 * @param avctx codec context
532 * @param data output AVFrame
533 * @param data_size size of output data or 0 if no picture is returned
534 * @param avpkt input packet
535 * @return number of consumed bytes on success or negative if decode fails
536 */
537 78 static int lag_decode_frame(AVCodecContext *avctx,
538 void *data, int *got_frame, AVPacket *avpkt)
539 {
540 78 const uint8_t *buf = avpkt->data;
541 78 unsigned int buf_size = avpkt->size;
542 78 LagarithContext *l = avctx->priv_data;
543 78 ThreadFrame frame = { .f = data };
544 78 AVFrame *const p = data;
545 uint8_t frametype;
546 78 uint32_t offset_gu = 0, offset_bv = 0, offset_ry = 9;
547 uint32_t offs[4];
548 uint8_t *srcs[4];
549 78 int i, j, planes = 3;
550 int ret;
551
552 78 p->key_frame = 1;
553 78 p->pict_type = AV_PICTURE_TYPE_I;
554
555 78 frametype = buf[0];
556
557 78 offset_gu = AV_RL32(buf + 1);
558 78 offset_bv = AV_RL32(buf + 5);
559
560
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78 switch (frametype) {
561 6 case FRAME_SOLID_RGBA:
562 6 avctx->pix_fmt = AV_PIX_FMT_GBRAP;
563 14 case FRAME_SOLID_GRAY:
564
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14 if (frametype == FRAME_SOLID_GRAY)
565
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8 if (avctx->bits_per_coded_sample == 24) {
566 8 avctx->pix_fmt = AV_PIX_FMT_GBRP;
567 } else {
568 avctx->pix_fmt = AV_PIX_FMT_GBRAP;
569 planes = 4;
570 }
571
572
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14 if ((ret = ff_thread_get_buffer(avctx, &frame, 0)) < 0)
573 return ret;
574
575
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14 if (frametype == FRAME_SOLID_RGBA) {
576
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2886 for (i = 0; i < avctx->height; i++) {
577 2880 memset(p->data[0] + i * p->linesize[0], buf[2], avctx->width);
578 2880 memset(p->data[1] + i * p->linesize[1], buf[1], avctx->width);
579 2880 memset(p->data[2] + i * p->linesize[2], buf[3], avctx->width);
580 2880 memset(p->data[3] + i * p->linesize[3], buf[4], avctx->width);
581 }
582 } else {
583
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2888 for (i = 0; i < avctx->height; i++) {
584
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11520 for (j = 0; j < planes; j++)
585 8640 memset(p->data[j] + i * p->linesize[j], buf[1], avctx->width);
586 }
587 }
588 14 break;
589 26 case FRAME_SOLID_COLOR:
590
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26 if (avctx->bits_per_coded_sample == 24) {
591 26 avctx->pix_fmt = AV_PIX_FMT_GBRP;
592 } else {
593 avctx->pix_fmt = AV_PIX_FMT_GBRAP;
594 }
595
596
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26 if ((ret = ff_thread_get_buffer(avctx, &frame,0)) < 0)
597 return ret;
598
599
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6266 for (i = 0; i < avctx->height; i++) {
600 6240 memset(p->data[0] + i * p->linesize[0], buf[2], avctx->width);
601 6240 memset(p->data[1] + i * p->linesize[1], buf[1], avctx->width);
602 6240 memset(p->data[2] + i * p->linesize[2], buf[3], avctx->width);
603
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6240 if (avctx->pix_fmt == AV_PIX_FMT_GBRAP)
604 memset(p->data[3] + i * p->linesize[3], 0xFFu, avctx->width);
605 }
606 26 break;
607 20 case FRAME_ARITH_RGBA:
608 20 avctx->pix_fmt = AV_PIX_FMT_GBRAP;
609 20 planes = 4;
610 20 offset_ry += 4;
611 20 offs[3] = AV_RL32(buf + 9);
612 33 case FRAME_ARITH_RGB24:
613 case FRAME_U_RGB24:
614
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33 if (frametype == FRAME_ARITH_RGB24 || frametype == FRAME_U_RGB24)
615 13 avctx->pix_fmt = AV_PIX_FMT_GBRP;
616
617
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33 if ((ret = ff_thread_get_buffer(avctx, &frame, 0)) < 0)
618 return ret;
619
620 33 offs[0] = offset_bv;
621 33 offs[1] = offset_gu;
622 33 offs[2] = offset_ry;
623
624
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152 for (i = 0; i < planes; i++)
625 119 srcs[i] = p->data[i] + (avctx->height - 1) * p->linesize[i];
626
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152 for (i = 0; i < planes; i++)
627
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119 if (buf_size <= offs[i]) {
628 av_log(avctx, AV_LOG_ERROR,
629 "Invalid frame offsets\n");
630 return AVERROR_INVALIDDATA;
631 }
632
633
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152 for (i = 0; i < planes; i++)
634 119 lag_decode_arith_plane(l, srcs[i],
635 avctx->width, avctx->height,
636 119 -p->linesize[i], buf + offs[i],
637 119 buf_size - offs[i]);
638
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13793 for (i = 0; i < avctx->height; i++) {
639 13760 l->llviddsp.add_bytes(p->data[0] + i * p->linesize[0], p->data[1] + i * p->linesize[1], avctx->width);
640 13760 l->llviddsp.add_bytes(p->data[2] + i * p->linesize[2], p->data[1] + i * p->linesize[1], avctx->width);
641 }
642 33 FFSWAP(uint8_t*, p->data[0], p->data[1]);
643 33 FFSWAP(int, p->linesize[0], p->linesize[1]);
644 33 FFSWAP(uint8_t*, p->data[2], p->data[1]);
645 33 FFSWAP(int, p->linesize[2], p->linesize[1]);
646 33 break;
647 2 case FRAME_ARITH_YUY2:
648 2 avctx->pix_fmt = AV_PIX_FMT_YUV422P;
649
650
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2 if ((ret = ff_thread_get_buffer(avctx, &frame, 0)) < 0)
651 return ret;
652
653
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2 if (offset_ry >= buf_size ||
654
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2 offset_gu >= buf_size ||
655 offset_bv >= buf_size) {
656 av_log(avctx, AV_LOG_ERROR,
657 "Invalid frame offsets\n");
658 return AVERROR_INVALIDDATA;
659 }
660
661 2 lag_decode_arith_plane(l, p->data[0], avctx->width, avctx->height,
662 p->linesize[0], buf + offset_ry,
663 2 buf_size - offset_ry);
664 2 lag_decode_arith_plane(l, p->data[1], (avctx->width + 1) / 2,
665 avctx->height, p->linesize[1],
666 2 buf + offset_gu, buf_size - offset_gu);
667 2 lag_decode_arith_plane(l, p->data[2], (avctx->width + 1) / 2,
668 avctx->height, p->linesize[2],
669 2 buf + offset_bv, buf_size - offset_bv);
670 2 break;
671 3 case FRAME_ARITH_YV12:
672 3 avctx->pix_fmt = AV_PIX_FMT_YUV420P;
673
674
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3 if ((ret = ff_thread_get_buffer(avctx, &frame, 0)) < 0)
675 return ret;
676
677
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3 if (offset_ry >= buf_size ||
678
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3 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 3 lag_decode_arith_plane(l, p->data[0], avctx->width, avctx->height,
686 p->linesize[0], buf + offset_ry,
687 3 buf_size - offset_ry);
688 3 lag_decode_arith_plane(l, p->data[2], (avctx->width + 1) / 2,
689 3 (avctx->height + 1) / 2, p->linesize[2],
690 3 buf + offset_gu, buf_size - offset_gu);
691 3 lag_decode_arith_plane(l, p->data[1], (avctx->width + 1) / 2,
692 3 (avctx->height + 1) / 2, p->linesize[1],
693 3 buf + offset_bv, buf_size - offset_bv);
694 3 break;
695 default:
696 av_log(avctx, AV_LOG_ERROR,
697 "Unsupported Lagarith frame type: %#"PRIx8"\n", frametype);
698 return AVERROR_PATCHWELCOME;
699 }
700
701 78 *got_frame = 1;
702
703 78 return buf_size;
704 }
705
706 18 static av_cold int lag_decode_init(AVCodecContext *avctx)
707 {
708 18 LagarithContext *l = avctx->priv_data;
709 18 l->avctx = avctx;
710
711 18 ff_llviddsp_init(&l->llviddsp);
712
713 18 return 0;
714 }
715
716 const AVCodec ff_lagarith_decoder = {
717 .name = "lagarith",
718 .long_name = NULL_IF_CONFIG_SMALL("Lagarith lossless"),
719 .type = AVMEDIA_TYPE_VIDEO,
720 .id = AV_CODEC_ID_LAGARITH,
721 .priv_data_size = sizeof(LagarithContext),
722 .init = lag_decode_init,
723 .decode = lag_decode_frame,
724 .capabilities = AV_CODEC_CAP_DR1 | AV_CODEC_CAP_FRAME_THREADS,
725 .caps_internal = FF_CODEC_CAP_INIT_THREADSAFE,
726 };
727