FFmpeg coverage


Directory: ../../../ffmpeg/
File: src/libavcodec/pixlet.c
Date: 2022-07-05 19:52:29
Exec Total Coverage
Lines: 336 406 82.8%
Branches: 114 178 64.0%

Line Branch Exec Source
1 /*
2 * Apple Pixlet decoder
3 * Copyright (c) 2016 Paul B Mahol
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 #include <stdint.h>
23
24 #include "libavutil/imgutils.h"
25 #include "libavutil/intmath.h"
26 #include "libavutil/opt.h"
27
28 #include "avcodec.h"
29 #include "bytestream.h"
30 #include "codec_internal.h"
31 #include "get_bits.h"
32 #include "internal.h"
33 #include "thread.h"
34 #include "unary.h"
35
36 #define NB_LEVELS 4
37
38 #define PIXLET_MAGIC 0xDEADBEEF
39
40 #define H 0
41 #define V 1
42
43 typedef struct SubBand {
44 unsigned width, height;
45 unsigned size;
46 unsigned x, y;
47 } SubBand;
48
49 typedef struct PixletContext {
50 AVClass *class;
51
52 GetByteContext gb;
53 GetBitContext bc;
54
55 int levels;
56 int depth;
57 int w, h;
58
59 int16_t *filter[2];
60 int16_t *prediction;
61 int64_t scaling[4][2][NB_LEVELS];
62 uint16_t lut[65536];
63 SubBand band[4][NB_LEVELS * 3 + 1];
64 } PixletContext;
65
66 2 static av_cold int pixlet_init(AVCodecContext *avctx)
67 {
68 2 avctx->pix_fmt = AV_PIX_FMT_YUV420P16;
69 2 avctx->color_range = AVCOL_RANGE_JPEG;
70 2 return 0;
71 }
72
73 3 static void free_buffers(AVCodecContext *avctx)
74 {
75 3 PixletContext *ctx = avctx->priv_data;
76
77 3 av_freep(&ctx->filter[0]);
78 3 av_freep(&ctx->filter[1]);
79 3 av_freep(&ctx->prediction);
80 3 }
81
82 2 static av_cold int pixlet_close(AVCodecContext *avctx)
83 {
84 2 PixletContext *ctx = avctx->priv_data;
85 2 free_buffers(avctx);
86 2 ctx->w = 0;
87 2 ctx->h = 0;
88 2 return 0;
89 }
90
91 1 static int init_decoder(AVCodecContext *avctx)
92 {
93 1 PixletContext *ctx = avctx->priv_data;
94 int i, plane;
95
96 1 ctx->filter[0] = av_malloc_array(ctx->h, sizeof(int16_t));
97 1 ctx->filter[1] = av_malloc_array(FFMAX(ctx->h, ctx->w) + 16, sizeof(int16_t));
98 1 ctx->prediction = av_malloc_array((ctx->w >> NB_LEVELS), sizeof(int16_t));
99
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1 if (!ctx->filter[0] || !ctx->filter[1] || !ctx->prediction)
100 return AVERROR(ENOMEM);
101
102
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4 for (plane = 0; plane < 3; plane++) {
103 3 unsigned shift = plane > 0;
104 3 unsigned w = ctx->w >> shift;
105 3 unsigned h = ctx->h >> shift;
106
107 3 ctx->band[plane][0].width = w >> NB_LEVELS;
108 3 ctx->band[plane][0].height = h >> NB_LEVELS;
109 3 ctx->band[plane][0].size = (w >> NB_LEVELS) * (h >> NB_LEVELS);
110
111
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39 for (i = 0; i < NB_LEVELS * 3; i++) {
112 36 unsigned scale = ctx->levels - (i / 3);
113
114 36 ctx->band[plane][i + 1].width = w >> scale;
115 36 ctx->band[plane][i + 1].height = h >> scale;
116 36 ctx->band[plane][i + 1].size = (w >> scale) * (h >> scale);
117
118 36 ctx->band[plane][i + 1].x = (w >> scale) * (((i + 1) % 3) != 2);
119 36 ctx->band[plane][i + 1].y = (h >> scale) * (((i + 1) % 3) != 1);
120 }
121 }
122
123 1 return 0;
124 }
125
126 9 static int read_low_coeffs(AVCodecContext *avctx, int16_t *dst, int size,
127 int width, ptrdiff_t stride)
128 {
129 9 PixletContext *ctx = avctx->priv_data;
130 9 GetBitContext *bc = &ctx->bc;
131 9 unsigned cnt1, nbits, k, j = 0, i = 0;
132 9 int64_t value, state = 3;
133 9 int rlen, escape, flag = 0;
134
135
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12 while (i < size) {
136 3 nbits = FFMIN(ff_clz((state >> 8) + 3) ^ 0x1F, 14);
137
138 3 cnt1 = get_unary(bc, 0, 8);
139
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3 if (cnt1 < 8) {
140 value = show_bits(bc, nbits);
141 if (value <= 1) {
142 skip_bits(bc, nbits - 1);
143 escape = ((1 << nbits) - 1) * cnt1;
144 } else {
145 skip_bits(bc, nbits);
146 escape = value + ((1 << nbits) - 1) * cnt1 - 1;
147 }
148 } else {
149 3 escape = get_bits(bc, 16);
150 }
151
152 3 value = -((escape + flag) & 1) | 1;
153 3 dst[j++] = value * ((escape + flag + 1) >> 1);
154 3 i++;
155
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3 if (j == width) {
156 3 j = 0;
157 3 dst += stride;
158 }
159 3 state = 120 * (escape + flag) + state - (120 * state >> 8);
160 3 flag = 0;
161
162
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3 if (state * 4ULL > 0xFF || i >= size)
163 3 continue;
164
165 nbits = ((state + 8) >> 5) + (state ? ff_clz(state) : 32) - 24;
166 escape = av_mod_uintp2(16383, nbits);
167 cnt1 = get_unary(bc, 0, 8);
168 if (cnt1 > 7) {
169 rlen = get_bits(bc, 16);
170 } else {
171 value = show_bits(bc, nbits);
172 if (value > 1) {
173 skip_bits(bc, nbits);
174 rlen = value + escape * cnt1 - 1;
175 } else {
176 skip_bits(bc, nbits - 1);
177 rlen = escape * cnt1;
178 }
179 }
180
181 if (rlen > size - i)
182 return AVERROR_INVALIDDATA;
183 i += rlen;
184
185 for (k = 0; k < rlen; k++) {
186 dst[j++] = 0;
187 if (j == width) {
188 j = 0;
189 dst += stride;
190 }
191 }
192
193 state = 0;
194 flag = rlen < 0xFFFF ? 1 : 0;
195 }
196
197 9 align_get_bits(bc);
198 9 return get_bits_count(bc) >> 3;
199 }
200
201 36 static int read_high_coeffs(AVCodecContext *avctx, uint8_t *src, int16_t *dst,
202 int size, int c, int a, int d,
203 int width, ptrdiff_t stride)
204 {
205 36 PixletContext *ctx = avctx->priv_data;
206 36 GetBitContext *bc = &ctx->bc;
207 36 unsigned cnt1, shbits, rlen, nbits, length, i = 0, j = 0, k;
208 36 int ret, escape, pfx, value, yflag, xflag, flag = 0;
209 36 int64_t state = 3, tmp;
210
211 36 ret = init_get_bits8(bc, src, bytestream2_get_bytes_left(&ctx->gb));
212
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36 if (ret < 0)
213 return ret;
214
215
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36 if (a ^ (a >> 31)) {
216 36 nbits = 33 - ff_clz(a ^ (a >> 31));
217
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36 if (nbits > 16)
218 return AVERROR_INVALIDDATA;
219 } else {
220 nbits = 1;
221 }
222
223 36 length = 25 - nbits;
224
225
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751 while (i < size) {
226
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715 if (((state >> 8) + 3) & 0xFFFFFFF)
227 715 value = ff_clz((state >> 8) + 3) ^ 0x1F;
228 else
229 value = -1;
230
231 715 cnt1 = get_unary(bc, 0, length);
232
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715 if (cnt1 >= length) {
233 46 cnt1 = get_bits(bc, nbits);
234 } else {
235 669 pfx = 14 + ((((uint64_t)(value - 14)) >> 32) & (value - 14));
236
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669 if (pfx < 1 || pfx > 25)
237 return AVERROR_INVALIDDATA;
238 669 cnt1 *= (1 << pfx) - 1;
239 669 shbits = show_bits(bc, pfx);
240
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669 if (shbits <= 1) {
241 394 skip_bits(bc, pfx - 1);
242 } else {
243 275 skip_bits(bc, pfx);
244 275 cnt1 += shbits - 1;
245 }
246 }
247
248 715 xflag = flag + cnt1;
249 715 yflag = xflag;
250
251
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715 if (flag + cnt1 == 0) {
252 251 value = 0;
253 } else {
254 464 xflag &= 1u;
255 464 tmp = (int64_t)c * ((yflag + 1) >> 1) + (c >> 1);
256 464 value = xflag + (tmp ^ -xflag);
257 }
258
259 715 i++;
260 715 dst[j++] = value;
261
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715 if (j == width) {
262 85 j = 0;
263 85 dst += stride;
264 }
265 715 state += (int64_t)d * (uint64_t)yflag - ((int64_t)(d * (uint64_t)state) >> 8);
266
267 715 flag = 0;
268
269
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715 if ((uint64_t)state > 0xFF / 4 || i >= size)
270 651 continue;
271
272
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64 pfx = ((state + 8) >> 5) + (state ? ff_clz(state) : 32) - 24;
273 64 escape = av_mod_uintp2(16383, pfx);
274 64 cnt1 = get_unary(bc, 0, 8);
275
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64 if (cnt1 < 8) {
276
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62 if (pfx < 1 || pfx > 25)
277 return AVERROR_INVALIDDATA;
278
279 62 value = show_bits(bc, pfx);
280
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62 if (value > 1) {
281 40 skip_bits(bc, pfx);
282 40 rlen = value + escape * cnt1 - 1;
283 } else {
284 22 skip_bits(bc, pfx - 1);
285 22 rlen = escape * cnt1;
286 }
287 } else {
288
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2 if (get_bits1(bc))
289 value = get_bits(bc, 16);
290 else
291 2 value = get_bits(bc, 8);
292
293 2 rlen = value + 8 * escape;
294 }
295
296
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64 if (rlen > 0xFFFF || i + rlen > size)
297 return AVERROR_INVALIDDATA;
298 64 i += rlen;
299
300
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879 for (k = 0; k < rlen; k++) {
301 815 dst[j++] = 0;
302
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815 if (j == width) {
303 95 j = 0;
304 95 dst += stride;
305 }
306 }
307
308 64 state = 0;
309 64 flag = rlen < 0xFFFF ? 1 : 0;
310 }
311
312 36 align_get_bits(bc);
313 36 return get_bits_count(bc) >> 3;
314 }
315
316 3 static int read_highpass(AVCodecContext *avctx, uint8_t *ptr,
317 int plane, AVFrame *frame)
318 {
319 3 PixletContext *ctx = avctx->priv_data;
320 3 ptrdiff_t stride = frame->linesize[plane] / 2;
321 int i, ret;
322
323
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39 for (i = 0; i < ctx->levels * 3; i++) {
324 36 int32_t a = bytestream2_get_be32(&ctx->gb);
325 36 int32_t b = bytestream2_get_be32(&ctx->gb);
326 36 int32_t c = bytestream2_get_be32(&ctx->gb);
327 36 int32_t d = bytestream2_get_be32(&ctx->gb);
328 36 int16_t *dest = (int16_t *)frame->data[plane] +
329 36 ctx->band[plane][i + 1].x +
330 36 ctx->band[plane][i + 1].y * stride;
331 36 unsigned size = ctx->band[plane][i + 1].size;
332 36 uint32_t magic = bytestream2_get_be32(&ctx->gb);
333
334
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36 if (magic != PIXLET_MAGIC) {
335 av_log(avctx, AV_LOG_ERROR,
336 "wrong magic number: 0x%08"PRIX32" for plane %d, band %d\n",
337 magic, plane, i);
338 return AVERROR_INVALIDDATA;
339 }
340
341
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36 if (a == INT32_MIN)
342 return AVERROR_INVALIDDATA;
343
344 36 ret = read_high_coeffs(avctx, ptr + bytestream2_tell(&ctx->gb), dest, size,
345 36 c, (b >= FFABS(a)) ? b : a, d,
346
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36 ctx->band[plane][i + 1].width, stride);
347
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36 if (ret < 0) {
348 av_log(avctx, AV_LOG_ERROR,
349 "error in highpass coefficients for plane %d, band %d\n",
350 plane, i);
351 return ret;
352 }
353 36 bytestream2_skip(&ctx->gb, ret);
354 }
355
356 3 return 0;
357 }
358
359 3 static void lowpass_prediction(int16_t *dst, int16_t *pred,
360 int width, int height, ptrdiff_t stride)
361 {
362 int16_t val;
363 int i, j;
364
365 3 memset(pred, 0, width * sizeof(*pred));
366
367
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7 for (i = 0; i < height; i++) {
368 4 val = pred[0] + dst[0];
369 4 dst[0] = pred[0] = val;
370
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6 for (j = 1; j < width; j++) {
371 2 val = pred[j] + dst[j];
372 2 dst[j] = pred[j] = val;
373 2 dst[j] += dst[j-1];
374 }
375 4 dst += stride;
376 }
377 3 }
378
379 240 static void filterfn(int16_t *dest, int16_t *tmp, unsigned size, int64_t scale)
380 {
381 int16_t *low, *high, *ll, *lh, *hl, *hh;
382 int hsize, i, j;
383 int64_t value;
384
385 240 hsize = size >> 1;
386 240 low = tmp + 4;
387 240 high = &low[hsize + 8];
388
389 240 memcpy(low, dest, size);
390 240 memcpy(high, dest + hsize, size);
391
392 240 ll = &low[hsize];
393 240 lh = &low[hsize];
394 240 hl = &high[hsize];
395 240 hh = hl;
396
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1200 for (i = 4, j = 2; i; i--, j++, ll--, hh++, lh++, hl--) {
397 960 low[i - 5] = low[j - 1];
398 960 lh[0] = ll[-1];
399 960 high[i - 5] = high[j - 2];
400 960 hh[0] = hl[-2];
401 }
402
403
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2280 for (i = 0; i < hsize; i++) {
404 2040 value = (int64_t) low [i + 1] * -INT64_C(325392907) +
405 2040 (int64_t) low [i + 0] * INT64_C(3687786320) +
406 2040 (int64_t) low [i - 1] * -INT64_C(325392907) +
407 2040 (int64_t) high[i + 0] * INT64_C(1518500249) +
408 2040 (int64_t) high[i - 1] * INT64_C(1518500249);
409 2040 dest[i * 2] = av_clip_int16(((value >> 32) * (uint64_t)scale) >> 32);
410 }
411
412
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2280 for (i = 0; i < hsize; i++) {
413 2040 value = (int64_t) low [i + 2] * -INT64_C(65078576) +
414 2040 (int64_t) low [i + 1] * INT64_C(1583578880) +
415 2040 (int64_t) low [i + 0] * INT64_C(1583578880) +
416 2040 (int64_t) low [i - 1] * -INT64_C(65078576) +
417 2040 (int64_t) high[i + 1] * INT64_C(303700064) +
418 2040 (int64_t) high[i + 0] * -INT64_C(3644400640) +
419 2040 (int64_t) high[i - 1] * INT64_C(303700064);
420 2040 dest[i * 2 + 1] = av_clip_int16(((value >> 32) * (uint64_t)scale) >> 32);
421 }
422 240 }
423
424 3 static void reconstruction(AVCodecContext *avctx, int16_t *dest,
425 unsigned width, unsigned height, ptrdiff_t stride,
426 int64_t *scaling_h, int64_t *scaling_v)
427 {
428 3 PixletContext *ctx = avctx->priv_data;
429 unsigned scaled_width, scaled_height;
430 int16_t *ptr, *tmp;
431 int i, j, k;
432
433 3 scaled_width = width >> NB_LEVELS;
434 3 scaled_height = height >> NB_LEVELS;
435 3 tmp = ctx->filter[0];
436
437
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15 for (i = 0; i < NB_LEVELS; i++) {
438 12 int64_t scale_v = scaling_v[i];
439 12 int64_t scale_h = scaling_h[i];
440 12 scaled_width <<= 1;
441 12 scaled_height <<= 1;
442
443 12 ptr = dest;
444
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132 for (j = 0; j < scaled_height; j++) {
445 120 filterfn(ptr, ctx->filter[1], scaled_width, scale_v);
446 120 ptr += stride;
447 }
448
449
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132 for (j = 0; j < scaled_width; j++) {
450 120 ptr = dest + j;
451
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2160 for (k = 0; k < scaled_height; k++) {
452 2040 tmp[k] = *ptr;
453 2040 ptr += stride;
454 }
455
456 120 filterfn(tmp, ctx->filter[1], scaled_height, scale_h);
457
458 120 ptr = dest + j;
459
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2160 for (k = 0; k < scaled_height; k++) {
460 2040 *ptr = tmp[k];
461 2040 ptr += stride;
462 }
463 }
464 }
465 3 }
466
467 1 static void build_luma_lut(AVCodecContext *avctx, int depth)
468 {
469 1 PixletContext *ctx = avctx->priv_data;
470 1 int max = (1 << depth) - 1;
471
472
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1 if (ctx->depth == depth)
473 return;
474 1 ctx->depth = depth;
475
476
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65537 for (int i = 0; i < FF_ARRAY_ELEMS(ctx->lut); i++)
477 65536 ctx->lut[i] = ((int64_t)i * i * 65535LL) / max / max;
478 }
479
480 1 static void postprocess_luma(AVCodecContext *avctx, AVFrame *frame,
481 int w, int h, int depth)
482 {
483 1 PixletContext *ctx = avctx->priv_data;
484 1 uint16_t *dsty = (uint16_t *)frame->data[0];
485 1 int16_t *srcy = (int16_t *)frame->data[0];
486 1 ptrdiff_t stridey = frame->linesize[0] / 2;
487 1 uint16_t *lut = ctx->lut;
488 int i, j;
489
490
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33 for (j = 0; j < h; j++) {
491
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1056 for (i = 0; i < w; i++) {
492
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1024 if (srcy[i] <= 0)
493 1 dsty[i] = 0;
494
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1023 else if (srcy[i] > ((1 << depth) - 1))
495 dsty[i] = 65535;
496 else
497 1023 dsty[i] = lut[srcy[i]];
498 }
499 32 dsty += stridey;
500 32 srcy += stridey;
501 }
502 1 }
503
504 1 static void postprocess_chroma(AVFrame *frame, int w, int h, int depth)
505 {
506 1 uint16_t *dstu = (uint16_t *)frame->data[1];
507 1 uint16_t *dstv = (uint16_t *)frame->data[2];
508 1 int16_t *srcu = (int16_t *)frame->data[1];
509 1 int16_t *srcv = (int16_t *)frame->data[2];
510 1 ptrdiff_t strideu = frame->linesize[1] / 2;
511 1 ptrdiff_t stridev = frame->linesize[2] / 2;
512 1 const unsigned add = 1 << (depth - 1);
513 1 const unsigned shift = 16 - depth;
514 int i, j;
515
516
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17 for (j = 0; j < h; j++) {
517
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272 for (i = 0; i < w; i++) {
518 256 dstu[i] = av_clip_uintp2_c(add + srcu[i], depth) << shift;
519 256 dstv[i] = av_clip_uintp2_c(add + srcv[i], depth) << shift;
520 }
521 16 dstu += strideu;
522 16 dstv += stridev;
523 16 srcu += strideu;
524 16 srcv += stridev;
525 }
526 1 }
527
528 3 static int decode_plane(AVCodecContext *avctx, int plane,
529 const AVPacket *avpkt, AVFrame *frame)
530 {
531 3 PixletContext *ctx = avctx->priv_data;
532 3 ptrdiff_t stride = frame->linesize[plane] / 2;
533 3 unsigned shift = plane > 0;
534 int16_t *dst;
535 int i, ret;
536
537
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15 for (i = ctx->levels - 1; i >= 0; i--) {
538 12 int32_t h = sign_extend(bytestream2_get_be32(&ctx->gb), 32);
539 12 int32_t v = sign_extend(bytestream2_get_be32(&ctx->gb), 32);
540
541
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12 if (!h || !v)
542 return AVERROR_INVALIDDATA;
543
544 12 ctx->scaling[plane][H][i] = (1000000ULL << 32) / h;
545 12 ctx->scaling[plane][V][i] = (1000000ULL << 32) / v;
546 }
547
548 3 bytestream2_skip(&ctx->gb, 4);
549
550 3 dst = (int16_t *)frame->data[plane];
551 3 dst[0] = sign_extend(bytestream2_get_be16(&ctx->gb), 16);
552
553 3 ret = init_get_bits8(&ctx->bc, avpkt->data + bytestream2_tell(&ctx->gb),
554 bytestream2_get_bytes_left(&ctx->gb));
555
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3 if (ret < 0)
556 return ret;
557
558 3 ret = read_low_coeffs(avctx, dst + 1, ctx->band[plane][0].width - 1,
559 3 ctx->band[plane][0].width - 1, 0);
560
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3 if (ret < 0) {
561 av_log(avctx, AV_LOG_ERROR,
562 "error in lowpass coefficients for plane %d, top row\n", plane);
563 return ret;
564 }
565
566 3 ret = read_low_coeffs(avctx, dst + stride,
567 3 ctx->band[plane][0].height - 1, 1, stride);
568
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3 if (ret < 0) {
569 av_log(avctx, AV_LOG_ERROR,
570 "error in lowpass coefficients for plane %d, left column\n",
571 plane);
572 return ret;
573 }
574
575 3 ret = read_low_coeffs(avctx, dst + stride + 1,
576 3 (ctx->band[plane][0].width - 1) * (ctx->band[plane][0].height - 1),
577 3 ctx->band[plane][0].width - 1, stride);
578
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3 if (ret < 0) {
579 av_log(avctx, AV_LOG_ERROR,
580 "error in lowpass coefficients for plane %d, rest\n", plane);
581 return ret;
582 }
583
584 3 bytestream2_skip(&ctx->gb, ret);
585
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3 if (bytestream2_get_bytes_left(&ctx->gb) <= 0) {
586 av_log(avctx, AV_LOG_ERROR, "no bytes left\n");
587 return AVERROR_INVALIDDATA;
588 }
589
590 3 ret = read_highpass(avctx, avpkt->data, plane, frame);
591
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3 if (ret < 0)
592 return ret;
593
594 3 lowpass_prediction(dst, ctx->prediction, ctx->band[plane][0].width,
595 3 ctx->band[plane][0].height, stride);
596
597 3 reconstruction(avctx, (int16_t *)frame->data[plane], ctx->w >> shift,
598 3 ctx->h >> shift, stride, ctx->scaling[plane][H],
599 3 ctx->scaling[plane][V]);
600
601 3 return 0;
602 }
603
604 1 static int pixlet_decode_frame(AVCodecContext *avctx, AVFrame *p,
605 int *got_frame, AVPacket *avpkt)
606 {
607 1 PixletContext *ctx = avctx->priv_data;
608 int i, w, h, width, height, ret, version;
609 uint32_t pktsize, depth;
610
611 1 bytestream2_init(&ctx->gb, avpkt->data, avpkt->size);
612
613 1 pktsize = bytestream2_get_be32(&ctx->gb);
614
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1 if (pktsize <= 44 || pktsize - 4 > bytestream2_get_bytes_left(&ctx->gb)) {
615 av_log(avctx, AV_LOG_ERROR, "Invalid packet size %"PRIu32"\n", pktsize);
616 return AVERROR_INVALIDDATA;
617 }
618
619 1 version = bytestream2_get_le32(&ctx->gb);
620
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1 if (version != 1)
621 avpriv_request_sample(avctx, "Version %d", version);
622
623 1 bytestream2_skip(&ctx->gb, 4);
624
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1 if (bytestream2_get_be32(&ctx->gb) != 1)
625 return AVERROR_INVALIDDATA;
626 1 bytestream2_skip(&ctx->gb, 4);
627
628 1 width = bytestream2_get_be32(&ctx->gb);
629 1 height = bytestream2_get_be32(&ctx->gb);
630
631
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1 if ( width > INT_MAX - (1U << (NB_LEVELS + 1))
632
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1 || height > INT_MAX - (1U << (NB_LEVELS + 1)))
633 return AVERROR_INVALIDDATA;
634
635 1 w = FFALIGN(width, 1 << (NB_LEVELS + 1));
636 1 h = FFALIGN(height, 1 << (NB_LEVELS + 1));
637
638 1 ctx->levels = bytestream2_get_be32(&ctx->gb);
639
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1 if (ctx->levels != NB_LEVELS)
640 return AVERROR_INVALIDDATA;
641 1 depth = bytestream2_get_be32(&ctx->gb);
642
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1 if (depth < 8 || depth > 15) {
643 avpriv_request_sample(avctx, "Depth %d", depth);
644 return AVERROR_INVALIDDATA;
645 }
646
647 1 build_luma_lut(avctx, depth);
648
649 1 ret = ff_set_dimensions(avctx, w, h);
650
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1 if (ret < 0)
651 return ret;
652 1 avctx->width = width;
653 1 avctx->height = height;
654
655
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1 if (ctx->w != w || ctx->h != h) {
656 1 free_buffers(avctx);
657 1 ctx->w = w;
658 1 ctx->h = h;
659
660 1 ret = init_decoder(avctx);
661
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1 if (ret < 0) {
662 free_buffers(avctx);
663 ctx->w = 0;
664 ctx->h = 0;
665 return ret;
666 }
667 }
668
669 1 bytestream2_skip(&ctx->gb, 8);
670
671 1 p->pict_type = AV_PICTURE_TYPE_I;
672 1 p->key_frame = 1;
673 1 p->color_range = AVCOL_RANGE_JPEG;
674
675 1 ret = ff_thread_get_buffer(avctx, p, 0);
676
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1 if (ret < 0)
677 return ret;
678
679
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4 for (i = 0; i < 3; i++) {
680 3 ret = decode_plane(avctx, i, avpkt, p);
681
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3 if (ret < 0)
682 return ret;
683
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3 if (avctx->flags & AV_CODEC_FLAG_GRAY)
684 break;
685 }
686
687 1 postprocess_luma(avctx, p, ctx->w, ctx->h, ctx->depth);
688 1 postprocess_chroma(p, ctx->w >> 1, ctx->h >> 1, ctx->depth);
689
690 1 *got_frame = 1;
691
692 1 return pktsize;
693 }
694
695 const FFCodec ff_pixlet_decoder = {
696 .p.name = "pixlet",
697 .p.long_name = NULL_IF_CONFIG_SMALL("Apple Pixlet"),
698 .p.type = AVMEDIA_TYPE_VIDEO,
699 .p.id = AV_CODEC_ID_PIXLET,
700 .init = pixlet_init,
701 .close = pixlet_close,
702 FF_CODEC_DECODE_CB(pixlet_decode_frame),
703 .priv_data_size = sizeof(PixletContext),
704 .p.capabilities = AV_CODEC_CAP_DR1 |
705 AV_CODEC_CAP_FRAME_THREADS,
706 .caps_internal = FF_CODEC_CAP_INIT_THREADSAFE |
707 FF_CODEC_CAP_INIT_CLEANUP,
708 };
709