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