FFmpeg  4.4.4
pixlet.c
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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 
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  uint16_t lut[65536];
62  SubBand band[4][NB_LEVELS * 3 + 1];
64 
66 {
69  return 0;
70 }
71 
72 static void free_buffers(AVCodecContext *avctx)
73 {
74  PixletContext *ctx = avctx->priv_data;
75 
76  av_freep(&ctx->filter[0]);
77  av_freep(&ctx->filter[1]);
78  av_freep(&ctx->prediction);
79 }
80 
82 {
83  PixletContext *ctx = avctx->priv_data;
84  free_buffers(avctx);
85  ctx->w = 0;
86  ctx->h = 0;
87  return 0;
88 }
89 
90 static int init_decoder(AVCodecContext *avctx)
91 {
92  PixletContext *ctx = avctx->priv_data;
93  int i, plane;
94 
95  ctx->filter[0] = av_malloc_array(ctx->h, sizeof(int16_t));
96  ctx->filter[1] = av_malloc_array(FFMAX(ctx->h, ctx->w) + 16, sizeof(int16_t));
97  ctx->prediction = av_malloc_array((ctx->w >> NB_LEVELS), sizeof(int16_t));
98  if (!ctx->filter[0] || !ctx->filter[1] || !ctx->prediction)
99  return AVERROR(ENOMEM);
100 
101  for (plane = 0; plane < 3; plane++) {
102  unsigned shift = plane > 0;
103  unsigned w = ctx->w >> shift;
104  unsigned h = ctx->h >> shift;
105 
106  ctx->band[plane][0].width = w >> NB_LEVELS;
107  ctx->band[plane][0].height = h >> NB_LEVELS;
108  ctx->band[plane][0].size = (w >> NB_LEVELS) * (h >> NB_LEVELS);
109 
110  for (i = 0; i < NB_LEVELS * 3; i++) {
111  unsigned scale = ctx->levels - (i / 3);
112 
113  ctx->band[plane][i + 1].width = w >> scale;
114  ctx->band[plane][i + 1].height = h >> scale;
115  ctx->band[plane][i + 1].size = (w >> scale) * (h >> scale);
116 
117  ctx->band[plane][i + 1].x = (w >> scale) * (((i + 1) % 3) != 2);
118  ctx->band[plane][i + 1].y = (h >> scale) * (((i + 1) % 3) != 1);
119  }
120  }
121 
122  return 0;
123 }
124 
125 static int read_low_coeffs(AVCodecContext *avctx, int16_t *dst, int size,
126  int width, ptrdiff_t stride)
127 {
128  PixletContext *ctx = avctx->priv_data;
129  GetBitContext *bc = &ctx->bc;
130  unsigned cnt1, nbits, k, j = 0, i = 0;
131  int64_t value, state = 3;
132  int rlen, escape, flag = 0;
133 
134  while (i < size) {
135  nbits = FFMIN(ff_clz((state >> 8) + 3) ^ 0x1F, 14);
136 
137  cnt1 = get_unary(bc, 0, 8);
138  if (cnt1 < 8) {
139  value = show_bits(bc, nbits);
140  if (value <= 1) {
141  skip_bits(bc, nbits - 1);
142  escape = ((1 << nbits) - 1) * cnt1;
143  } else {
144  skip_bits(bc, nbits);
145  escape = value + ((1 << nbits) - 1) * cnt1 - 1;
146  }
147  } else {
148  escape = get_bits(bc, 16);
149  }
150 
151  value = -((escape + flag) & 1) | 1;
152  dst[j++] = value * ((escape + flag + 1) >> 1);
153  i++;
154  if (j == width) {
155  j = 0;
156  dst += stride;
157  }
158  state = 120 * (escape + flag) + state - (120 * state >> 8);
159  flag = 0;
160 
161  if (state * 4ULL > 0xFF || i >= size)
162  continue;
163 
164  nbits = ((state + 8) >> 5) + (state ? ff_clz(state) : 32) - 24;
165  escape = av_mod_uintp2(16383, nbits);
166  cnt1 = get_unary(bc, 0, 8);
167  if (cnt1 > 7) {
168  rlen = get_bits(bc, 16);
169  } else {
170  value = show_bits(bc, nbits);
171  if (value > 1) {
172  skip_bits(bc, nbits);
173  rlen = value + escape * cnt1 - 1;
174  } else {
175  skip_bits(bc, nbits - 1);
176  rlen = escape * cnt1;
177  }
178  }
179 
180  if (rlen > size - i)
181  return AVERROR_INVALIDDATA;
182  i += rlen;
183 
184  for (k = 0; k < rlen; k++) {
185  dst[j++] = 0;
186  if (j == width) {
187  j = 0;
188  dst += stride;
189  }
190  }
191 
192  state = 0;
193  flag = rlen < 0xFFFF ? 1 : 0;
194  }
195 
196  align_get_bits(bc);
197  return get_bits_count(bc) >> 3;
198 }
199 
200 static int read_high_coeffs(AVCodecContext *avctx, uint8_t *src, int16_t *dst,
201  int size, int c, int a, int d,
202  int width, ptrdiff_t stride)
203 {
204  PixletContext *ctx = avctx->priv_data;
205  GetBitContext *bc = &ctx->bc;
206  unsigned cnt1, shbits, rlen, nbits, length, i = 0, j = 0, k;
207  int ret, escape, pfx, value, yflag, xflag, flag = 0;
208  int64_t state = 3, tmp;
209 
211  if (ret < 0)
212  return ret;
213 
214  if (a ^ (a >> 31)) {
215  nbits = 33 - ff_clz(a ^ (a >> 31));
216  if (nbits > 16)
217  return AVERROR_INVALIDDATA;
218  } else {
219  nbits = 1;
220  }
221 
222  length = 25 - nbits;
223 
224  while (i < size) {
225  if (((state >> 8) + 3) & 0xFFFFFFF)
226  value = ff_clz((state >> 8) + 3) ^ 0x1F;
227  else
228  value = -1;
229 
230  cnt1 = get_unary(bc, 0, length);
231  if (cnt1 >= length) {
232  cnt1 = get_bits(bc, nbits);
233  } else {
234  pfx = 14 + ((((uint64_t)(value - 14)) >> 32) & (value - 14));
235  if (pfx < 1 || pfx > 25)
236  return AVERROR_INVALIDDATA;
237  cnt1 *= (1 << pfx) - 1;
238  shbits = show_bits(bc, pfx);
239  if (shbits <= 1) {
240  skip_bits(bc, pfx - 1);
241  } else {
242  skip_bits(bc, pfx);
243  cnt1 += shbits - 1;
244  }
245  }
246 
247  xflag = flag + cnt1;
248  yflag = xflag;
249 
250  if (flag + cnt1 == 0) {
251  value = 0;
252  } else {
253  xflag &= 1u;
254  tmp = (int64_t)c * ((yflag + 1) >> 1) + (c >> 1);
255  value = xflag + (tmp ^ -xflag);
256  }
257 
258  i++;
259  dst[j++] = value;
260  if (j == width) {
261  j = 0;
262  dst += stride;
263  }
264  state += (int64_t)d * (uint64_t)yflag - ((int64_t)(d * (uint64_t)state) >> 8);
265 
266  flag = 0;
267 
268  if ((uint64_t)state > 0xFF / 4 || i >= size)
269  continue;
270 
271  pfx = ((state + 8) >> 5) + (state ? ff_clz(state) : 32) - 24;
272  escape = av_mod_uintp2(16383, pfx);
273  cnt1 = get_unary(bc, 0, 8);
274  if (cnt1 < 8) {
275  if (pfx < 1 || pfx > 25)
276  return AVERROR_INVALIDDATA;
277 
278  value = show_bits(bc, pfx);
279  if (value > 1) {
280  skip_bits(bc, pfx);
281  rlen = value + escape * cnt1 - 1;
282  } else {
283  skip_bits(bc, pfx - 1);
284  rlen = escape * cnt1;
285  }
286  } else {
287  if (get_bits1(bc))
288  value = get_bits(bc, 16);
289  else
290  value = get_bits(bc, 8);
291 
292  rlen = value + 8 * escape;
293  }
294 
295  if (rlen > 0xFFFF || i + rlen > size)
296  return AVERROR_INVALIDDATA;
297  i += rlen;
298 
299  for (k = 0; k < rlen; k++) {
300  dst[j++] = 0;
301  if (j == width) {
302  j = 0;
303  dst += stride;
304  }
305  }
306 
307  state = 0;
308  flag = rlen < 0xFFFF ? 1 : 0;
309  }
310 
311  align_get_bits(bc);
312  return get_bits_count(bc) >> 3;
313 }
314 
315 static int read_highpass(AVCodecContext *avctx, uint8_t *ptr,
316  int plane, AVFrame *frame)
317 {
318  PixletContext *ctx = avctx->priv_data;
319  ptrdiff_t stride = frame->linesize[plane] / 2;
320  int i, ret;
321 
322  for (i = 0; i < ctx->levels * 3; i++) {
323  int32_t a = bytestream2_get_be32(&ctx->gb);
324  int32_t b = bytestream2_get_be32(&ctx->gb);
325  int32_t c = bytestream2_get_be32(&ctx->gb);
326  int32_t d = bytestream2_get_be32(&ctx->gb);
327  int16_t *dest = (int16_t *)frame->data[plane] +
328  ctx->band[plane][i + 1].x +
329  ctx->band[plane][i + 1].y * stride;
330  unsigned size = ctx->band[plane][i + 1].size;
331  uint32_t magic = bytestream2_get_be32(&ctx->gb);
332 
333  if (magic != PIXLET_MAGIC) {
334  av_log(avctx, AV_LOG_ERROR,
335  "wrong magic number: 0x%08"PRIX32" for plane %d, band %d\n",
336  magic, plane, i);
337  return AVERROR_INVALIDDATA;
338  }
339 
340  if (a == INT32_MIN)
341  return AVERROR_INVALIDDATA;
342 
343  ret = read_high_coeffs(avctx, ptr + bytestream2_tell(&ctx->gb), dest, size,
344  c, (b >= FFABS(a)) ? b : a, d,
345  ctx->band[plane][i + 1].width, stride);
346  if (ret < 0) {
347  av_log(avctx, AV_LOG_ERROR,
348  "error in highpass coefficients for plane %d, band %d\n",
349  plane, i);
350  return ret;
351  }
352  bytestream2_skip(&ctx->gb, ret);
353  }
354 
355  return 0;
356 }
357 
358 static void lowpass_prediction(int16_t *dst, int16_t *pred,
359  int width, int height, ptrdiff_t stride)
360 {
361  int16_t val;
362  int i, j;
363 
364  memset(pred, 0, width * sizeof(*pred));
365 
366  for (i = 0; i < height; i++) {
367  val = pred[0] + dst[0];
368  dst[0] = pred[0] = val;
369  for (j = 1; j < width; j++) {
370  val = pred[j] + dst[j];
371  dst[j] = pred[j] = val;
372  dst[j] += dst[j-1];
373  }
374  dst += stride;
375  }
376 }
377 
378 static void filterfn(int16_t *dest, int16_t *tmp, unsigned size, int64_t scale)
379 {
380  int16_t *low, *high, *ll, *lh, *hl, *hh;
381  int hsize, i, j;
382  int64_t value;
383 
384  hsize = size >> 1;
385  low = tmp + 4;
386  high = &low[hsize + 8];
387 
388  memcpy(low, dest, size);
389  memcpy(high, dest + hsize, size);
390 
391  ll = &low[hsize];
392  lh = &low[hsize];
393  hl = &high[hsize];
394  hh = hl;
395  for (i = 4, j = 2; i; i--, j++, ll--, hh++, lh++, hl--) {
396  low[i - 5] = low[j - 1];
397  lh[0] = ll[-1];
398  high[i - 5] = high[j - 2];
399  hh[0] = hl[-2];
400  }
401 
402  for (i = 0; i < hsize; i++) {
403  value = (int64_t) low [i + 1] * -INT64_C(325392907) +
404  (int64_t) low [i + 0] * INT64_C(3687786320) +
405  (int64_t) low [i - 1] * -INT64_C(325392907) +
406  (int64_t) high[i + 0] * INT64_C(1518500249) +
407  (int64_t) high[i - 1] * INT64_C(1518500249);
408  dest[i * 2] = av_clip_int16(((value >> 32) * (uint64_t)scale) >> 32);
409  }
410 
411  for (i = 0; i < hsize; i++) {
412  value = (int64_t) low [i + 2] * -INT64_C(65078576) +
413  (int64_t) low [i + 1] * INT64_C(1583578880) +
414  (int64_t) low [i + 0] * INT64_C(1583578880) +
415  (int64_t) low [i - 1] * -INT64_C(65078576) +
416  (int64_t) high[i + 1] * INT64_C(303700064) +
417  (int64_t) high[i + 0] * -INT64_C(3644400640) +
418  (int64_t) high[i - 1] * INT64_C(303700064);
419  dest[i * 2 + 1] = av_clip_int16(((value >> 32) * (uint64_t)scale) >> 32);
420  }
421 }
422 
423 static void reconstruction(AVCodecContext *avctx, int16_t *dest,
424  unsigned width, unsigned height, ptrdiff_t stride,
425  int64_t *scaling_h, int64_t *scaling_v)
426 {
427  PixletContext *ctx = avctx->priv_data;
428  unsigned scaled_width, scaled_height;
429  int16_t *ptr, *tmp;
430  int i, j, k;
431 
432  scaled_width = width >> NB_LEVELS;
433  scaled_height = height >> NB_LEVELS;
434  tmp = ctx->filter[0];
435 
436  for (i = 0; i < NB_LEVELS; i++) {
437  int64_t scale_v = scaling_v[i];
438  int64_t scale_h = scaling_h[i];
439  scaled_width <<= 1;
440  scaled_height <<= 1;
441 
442  ptr = dest;
443  for (j = 0; j < scaled_height; j++) {
444  filterfn(ptr, ctx->filter[1], scaled_width, scale_v);
445  ptr += stride;
446  }
447 
448  for (j = 0; j < scaled_width; j++) {
449  ptr = dest + j;
450  for (k = 0; k < scaled_height; k++) {
451  tmp[k] = *ptr;
452  ptr += stride;
453  }
454 
455  filterfn(tmp, ctx->filter[1], scaled_height, scale_h);
456 
457  ptr = dest + j;
458  for (k = 0; k < scaled_height; k++) {
459  *ptr = tmp[k];
460  ptr += stride;
461  }
462  }
463  }
464 }
465 
466 static void build_luma_lut(AVCodecContext *avctx, int depth)
467 {
468  PixletContext *ctx = avctx->priv_data;
469  int max = (1 << depth) - 1;
470 
471  if (ctx->depth == depth)
472  return;
473  ctx->depth = depth;
474 
475  for (int i = 0; i < FF_ARRAY_ELEMS(ctx->lut); i++)
476  ctx->lut[i] = ((int64_t)i * i * 65535LL) / max / max;
477 }
478 
480  int w, int h, int depth)
481 {
482  PixletContext *ctx = avctx->priv_data;
483  uint16_t *dsty = (uint16_t *)frame->data[0];
484  int16_t *srcy = (int16_t *)frame->data[0];
485  ptrdiff_t stridey = frame->linesize[0] / 2;
486  uint16_t *lut = ctx->lut;
487  int i, j;
488 
489  for (j = 0; j < h; j++) {
490  for (i = 0; i < w; i++) {
491  if (srcy[i] <= 0)
492  dsty[i] = 0;
493  else if (srcy[i] > ((1 << depth) - 1))
494  dsty[i] = 65535;
495  else
496  dsty[i] = lut[srcy[i]];
497  }
498  dsty += stridey;
499  srcy += stridey;
500  }
501 }
502 
503 static void postprocess_chroma(AVFrame *frame, int w, int h, int depth)
504 {
505  uint16_t *dstu = (uint16_t *)frame->data[1];
506  uint16_t *dstv = (uint16_t *)frame->data[2];
507  int16_t *srcu = (int16_t *)frame->data[1];
508  int16_t *srcv = (int16_t *)frame->data[2];
509  ptrdiff_t strideu = frame->linesize[1] / 2;
510  ptrdiff_t stridev = frame->linesize[2] / 2;
511  const unsigned add = 1 << (depth - 1);
512  const unsigned shift = 16 - depth;
513  int i, j;
514 
515  for (j = 0; j < h; j++) {
516  for (i = 0; i < w; i++) {
517  dstu[i] = av_clip_uintp2_c(add + srcu[i], depth) << shift;
518  dstv[i] = av_clip_uintp2_c(add + srcv[i], depth) << shift;
519  }
520  dstu += strideu;
521  dstv += stridev;
522  srcu += strideu;
523  srcv += stridev;
524  }
525 }
526 
527 static int decode_plane(AVCodecContext *avctx, int plane,
528  const AVPacket *avpkt, AVFrame *frame)
529 {
530  PixletContext *ctx = avctx->priv_data;
531  ptrdiff_t stride = frame->linesize[plane] / 2;
532  unsigned shift = plane > 0;
533  int16_t *dst;
534  int i, ret;
535 
536  for (i = ctx->levels - 1; i >= 0; i--) {
537  int32_t h = sign_extend(bytestream2_get_be32(&ctx->gb), 32);
538  int32_t v = sign_extend(bytestream2_get_be32(&ctx->gb), 32);
539 
540  if (!h || !v)
541  return AVERROR_INVALIDDATA;
542 
543  ctx->scaling[plane][H][i] = (1000000ULL << 32) / h;
544  ctx->scaling[plane][V][i] = (1000000ULL << 32) / v;
545  }
546 
547  bytestream2_skip(&ctx->gb, 4);
548 
549  dst = (int16_t *)frame->data[plane];
550  dst[0] = sign_extend(bytestream2_get_be16(&ctx->gb), 16);
551 
552  ret = init_get_bits8(&ctx->bc, avpkt->data + bytestream2_tell(&ctx->gb),
554  if (ret < 0)
555  return ret;
556 
557  ret = read_low_coeffs(avctx, dst + 1, ctx->band[plane][0].width - 1,
558  ctx->band[plane][0].width - 1, 0);
559  if (ret < 0) {
560  av_log(avctx, AV_LOG_ERROR,
561  "error in lowpass coefficients for plane %d, top row\n", plane);
562  return ret;
563  }
564 
565  ret = read_low_coeffs(avctx, dst + stride,
566  ctx->band[plane][0].height - 1, 1, stride);
567  if (ret < 0) {
568  av_log(avctx, AV_LOG_ERROR,
569  "error in lowpass coefficients for plane %d, left column\n",
570  plane);
571  return ret;
572  }
573 
574  ret = read_low_coeffs(avctx, dst + stride + 1,
575  (ctx->band[plane][0].width - 1) * (ctx->band[plane][0].height - 1),
576  ctx->band[plane][0].width - 1, stride);
577  if (ret < 0) {
578  av_log(avctx, AV_LOG_ERROR,
579  "error in lowpass coefficients for plane %d, rest\n", plane);
580  return ret;
581  }
582 
583  bytestream2_skip(&ctx->gb, ret);
584  if (bytestream2_get_bytes_left(&ctx->gb) <= 0) {
585  av_log(avctx, AV_LOG_ERROR, "no bytes left\n");
586  return AVERROR_INVALIDDATA;
587  }
588 
589  ret = read_highpass(avctx, avpkt->data, plane, frame);
590  if (ret < 0)
591  return ret;
592 
593  lowpass_prediction(dst, ctx->prediction, ctx->band[plane][0].width,
594  ctx->band[plane][0].height, stride);
595 
596  reconstruction(avctx, (int16_t *)frame->data[plane], ctx->w >> shift,
597  ctx->h >> shift, stride, ctx->scaling[plane][H],
598  ctx->scaling[plane][V]);
599 
600  return 0;
601 }
602 
603 static int pixlet_decode_frame(AVCodecContext *avctx, void *data,
604  int *got_frame, AVPacket *avpkt)
605 {
606  PixletContext *ctx = avctx->priv_data;
607  int i, w, h, width, height, ret, version;
608  AVFrame *p = data;
609  ThreadFrame frame = { .f = data };
610  uint32_t pktsize, depth;
611 
612  bytestream2_init(&ctx->gb, avpkt->data, avpkt->size);
613 
614  pktsize = bytestream2_get_be32(&ctx->gb);
615  if (pktsize <= 44 || pktsize - 4 > bytestream2_get_bytes_left(&ctx->gb)) {
616  av_log(avctx, AV_LOG_ERROR, "Invalid packet size %"PRIu32"\n", pktsize);
617  return AVERROR_INVALIDDATA;
618  }
619 
620  version = bytestream2_get_le32(&ctx->gb);
621  if (version != 1)
622  avpriv_request_sample(avctx, "Version %d", version);
623 
624  bytestream2_skip(&ctx->gb, 4);
625  if (bytestream2_get_be32(&ctx->gb) != 1)
626  return AVERROR_INVALIDDATA;
627  bytestream2_skip(&ctx->gb, 4);
628 
629  width = bytestream2_get_be32(&ctx->gb);
630  height = bytestream2_get_be32(&ctx->gb);
631 
632  if ( width > INT_MAX - (1U << (NB_LEVELS + 1))
633  || height > INT_MAX - (1U << (NB_LEVELS + 1)))
634  return AVERROR_INVALIDDATA;
635 
636  w = FFALIGN(width, 1 << (NB_LEVELS + 1));
637  h = FFALIGN(height, 1 << (NB_LEVELS + 1));
638 
639  ctx->levels = bytestream2_get_be32(&ctx->gb);
640  if (ctx->levels != NB_LEVELS)
641  return AVERROR_INVALIDDATA;
642  depth = bytestream2_get_be32(&ctx->gb);
643  if (depth < 8 || depth > 15) {
644  avpriv_request_sample(avctx, "Depth %d", depth);
645  return AVERROR_INVALIDDATA;
646  }
647 
648  build_luma_lut(avctx, depth);
649 
650  ret = ff_set_dimensions(avctx, w, h);
651  if (ret < 0)
652  return ret;
653  avctx->width = width;
654  avctx->height = height;
655 
656  if (ctx->w != w || ctx->h != h) {
657  free_buffers(avctx);
658  ctx->w = w;
659  ctx->h = h;
660 
661  ret = init_decoder(avctx);
662  if (ret < 0) {
663  free_buffers(avctx);
664  ctx->w = 0;
665  ctx->h = 0;
666  return ret;
667  }
668  }
669 
670  bytestream2_skip(&ctx->gb, 8);
671 
673  p->key_frame = 1;
675 
676  ret = ff_thread_get_buffer(avctx, &frame, 0);
677  if (ret < 0)
678  return ret;
679 
680  for (i = 0; i < 3; i++) {
681  ret = decode_plane(avctx, i, avpkt, frame.f);
682  if (ret < 0)
683  return ret;
684  if (avctx->flags & AV_CODEC_FLAG_GRAY)
685  break;
686  }
687 
688  postprocess_luma(avctx, frame.f, ctx->w, ctx->h, ctx->depth);
689  postprocess_chroma(frame.f, ctx->w >> 1, ctx->h >> 1, ctx->depth);
690 
691  *got_frame = 1;
692 
693  return pktsize;
694 }
695 
697  .name = "pixlet",
698  .long_name = NULL_IF_CONFIG_SMALL("Apple Pixlet"),
699  .type = AVMEDIA_TYPE_VIDEO,
700  .id = AV_CODEC_ID_PIXLET,
701  .init = pixlet_init,
702  .close = pixlet_close,
703  .decode = pixlet_decode_frame,
704  .priv_data_size = sizeof(PixletContext),
705  .capabilities = AV_CODEC_CAP_DR1 |
707  .caps_internal = FF_CODEC_CAP_INIT_THREADSAFE |
709 };
static double val(void *priv, double ch)
Definition: aeval.c:76
#define av_cold
Definition: attributes.h:88
uint8_t
int32_t
Libavcodec external API header.
static av_always_inline int bytestream2_get_bytes_left(GetByteContext *g)
Definition: bytestream.h:158
static av_always_inline void bytestream2_init(GetByteContext *g, const uint8_t *buf, int buf_size)
Definition: bytestream.h:137
static av_always_inline void bytestream2_skip(GetByteContext *g, unsigned int size)
Definition: bytestream.h:168
static av_always_inline int bytestream2_tell(GetByteContext *g)
Definition: bytestream.h:192
#define flag(name)
Definition: cbs_av1.c:553
static struct @321 state
#define FFMIN(a, b)
Definition: common.h:105
#define av_mod_uintp2
Definition: common.h:149
static av_always_inline av_const unsigned av_clip_uintp2_c(int a, int p)
Clip a signed integer to an unsigned power of two range.
Definition: common.h:302
#define av_clip_int16
Definition: common.h:137
#define FFMAX(a, b)
Definition: common.h:103
#define FFABS(a)
Absolute value, Note, INT_MIN / INT64_MIN result in undefined behavior as they are not representable ...
Definition: common.h:72
#define max(a, b)
Definition: cuda_runtime.h:33
static AVFrame * frame
static float add(float src0, float src1)
double value
Definition: eval.c:98
bitstream reader API header.
static unsigned int get_bits1(GetBitContext *s)
Definition: get_bits.h:498
static void skip_bits(GetBitContext *s, int n)
Definition: get_bits.h:467
static int init_get_bits8(GetBitContext *s, const uint8_t *buffer, int byte_size)
Initialize GetBitContext.
Definition: get_bits.h:677
static int get_bits_count(const GetBitContext *s)
Definition: get_bits.h:219
static unsigned int get_bits(GetBitContext *s, int n)
Read 1-25 bits.
Definition: get_bits.h:379
static const uint8_t * align_get_bits(GetBitContext *s)
Definition: get_bits.h:693
static unsigned int show_bits(GetBitContext *s, int n)
Show 1-25 bits.
Definition: get_bits.h:446
#define AV_CODEC_CAP_DR1
Codec uses get_buffer() or get_encode_buffer() for allocating buffers and supports custom allocators.
Definition: codec.h:52
#define AV_CODEC_FLAG_GRAY
Only decode/encode grayscale.
Definition: avcodec.h:308
#define AV_CODEC_CAP_FRAME_THREADS
Codec supports frame-level multithreading.
Definition: codec.h:108
@ AV_CODEC_ID_PIXLET
Definition: codec_id.h:273
#define AVERROR_INVALIDDATA
Invalid data found when processing input.
Definition: error.h:59
#define AVERROR(e)
Definition: error.h:43
#define AV_LOG_ERROR
Something went wrong and cannot losslessly be recovered.
Definition: log.h:194
#define ff_clz
Definition: intmath.h:142
@ AVMEDIA_TYPE_VIDEO
Definition: avutil.h:201
@ AV_PICTURE_TYPE_I
Intra.
Definition: avutil.h:274
misc image utilities
int i
Definition: input.c:407
#define FF_CODEC_CAP_INIT_THREADSAFE
The codec does not modify any global variables in the init function, allowing to call the init functi...
Definition: internal.h:41
#define FF_CODEC_CAP_INIT_CLEANUP
The codec allows calling the close function for deallocation even if the init function returned a fai...
Definition: internal.h:49
int ff_set_dimensions(AVCodecContext *s, int width, int height)
Check that the provided frame dimensions are valid and set them on the codec context.
Definition: utils.c:84
common internal API header
#define NULL_IF_CONFIG_SMALL(x)
Return NULL if CONFIG_SMALL is true, otherwise the argument without modification.
Definition: internal.h:117
version
Definition: libkvazaar.c:326
uint8_t w
Definition: llviddspenc.c:39
int stride
Definition: mace.c:144
#define FFALIGN(x, a)
Definition: macros.h:48
static av_const int sign_extend(int val, unsigned bits)
Definition: mathops.h:130
const char data[16]
Definition: mxf.c:142
AVOptions.
#define AV_PIX_FMT_YUV420P16
Definition: pixfmt.h:410
@ AVCOL_RANGE_JPEG
Full range content.
Definition: pixfmt.h:586
static int read_highpass(AVCodecContext *avctx, uint8_t *ptr, int plane, AVFrame *frame)
Definition: pixlet.c:315
#define PIXLET_MAGIC
Definition: pixlet.c:37
static int pixlet_decode_frame(AVCodecContext *avctx, void *data, int *got_frame, AVPacket *avpkt)
Definition: pixlet.c:603
static void filterfn(int16_t *dest, int16_t *tmp, unsigned size, int64_t scale)
Definition: pixlet.c:378
static void reconstruction(AVCodecContext *avctx, int16_t *dest, unsigned width, unsigned height, ptrdiff_t stride, int64_t *scaling_h, int64_t *scaling_v)
Definition: pixlet.c:423
#define NB_LEVELS
Definition: pixlet.c:35
static int read_low_coeffs(AVCodecContext *avctx, int16_t *dst, int size, int width, ptrdiff_t stride)
Definition: pixlet.c:125
static void lowpass_prediction(int16_t *dst, int16_t *pred, int width, int height, ptrdiff_t stride)
Definition: pixlet.c:358
AVCodec ff_pixlet_decoder
Definition: pixlet.c:696
static void postprocess_chroma(AVFrame *frame, int w, int h, int depth)
Definition: pixlet.c:503
static av_cold int pixlet_init(AVCodecContext *avctx)
Definition: pixlet.c:65
static void build_luma_lut(AVCodecContext *avctx, int depth)
Definition: pixlet.c:466
static av_cold int pixlet_close(AVCodecContext *avctx)
Definition: pixlet.c:81
static void postprocess_luma(AVCodecContext *avctx, AVFrame *frame, int w, int h, int depth)
Definition: pixlet.c:479
static int init_decoder(AVCodecContext *avctx)
Definition: pixlet.c:90
#define H
Definition: pixlet.c:39
static int decode_plane(AVCodecContext *avctx, int plane, const AVPacket *avpkt, AVFrame *frame)
Definition: pixlet.c:527
static void free_buffers(AVCodecContext *avctx)
Definition: pixlet.c:72
static int read_high_coeffs(AVCodecContext *avctx, uint8_t *src, int16_t *dst, int size, int c, int a, int d, int width, ptrdiff_t stride)
Definition: pixlet.c:200
#define V
Definition: pixlet.c:40
FF_ENABLE_DEPRECATION_WARNINGS int ff_thread_get_buffer(AVCodecContext *avctx, ThreadFrame *f, int flags)
Wrapper around get_buffer() for frame-multithreaded codecs.
#define FF_ARRAY_ELEMS(a)
static const float pred[4]
Definition: siprdata.h:259
static int shift(int a, int b)
Definition: sonic.c:82
Describe the class of an AVClass context structure.
Definition: log.h:67
main external API structure.
Definition: avcodec.h:536
enum AVPixelFormat pix_fmt
Pixel format, see AV_PIX_FMT_xxx.
Definition: avcodec.h:746
int width
picture width / height.
Definition: avcodec.h:709
enum AVColorRange color_range
MPEG vs JPEG YUV range.
Definition: avcodec.h:1171
int flags
AV_CODEC_FLAG_*.
Definition: avcodec.h:616
void * priv_data
Definition: avcodec.h:563
AVCodec.
Definition: codec.h:197
const char * name
Name of the codec implementation.
Definition: codec.h:204
This structure describes decoded (raw) audio or video data.
Definition: frame.h:318
uint8_t * data[AV_NUM_DATA_POINTERS]
pointer to the picture/channel planes.
Definition: frame.h:332
int key_frame
1 -> keyframe, 0-> not
Definition: frame.h:396
enum AVColorRange color_range
MPEG vs JPEG YUV range.
Definition: frame.h:562
int linesize[AV_NUM_DATA_POINTERS]
For video, size in bytes of each picture line.
Definition: frame.h:349
enum AVPictureType pict_type
Picture type of the frame.
Definition: frame.h:401
This structure stores compressed data.
Definition: packet.h:346
int size
Definition: packet.h:370
uint8_t * data
Definition: packet.h:369
uint16_t lut[65536]
Definition: pixlet.c:61
SubBand band[4][NB_LEVELS *3+1]
Definition: pixlet.c:62
int levels
Definition: pixlet.c:54
int depth
Definition: pixlet.c:55
GetBitContext bc
Definition: pixlet.c:52
int16_t * filter[2]
Definition: pixlet.c:58
GetByteContext gb
Definition: pixlet.c:51
int16_t * prediction
Definition: pixlet.c:59
int64_t scaling[4][2][NB_LEVELS]
Definition: pixlet.c:60
Definition: cfhd.h:111
unsigned height
Definition: pixlet.c:43
unsigned x
Definition: pixlet.c:45
int width
Definition: cfhd.h:114
unsigned y
Definition: pixlet.c:45
unsigned size
Definition: pixlet.c:44
#define av_malloc_array(a, b)
#define avpriv_request_sample(...)
#define av_freep(p)
#define av_log(a,...)
static uint8_t tmp[11]
Definition: aes_ctr.c:27
#define src
Definition: vp8dsp.c:255
AVFormatContext * ctx
Definition: movenc.c:48
#define height
#define width
int size
static int get_unary(GetBitContext *gb, int stop, int len)
Get unary code of limited length.
Definition: unary.h:46
const char * b
Definition: vf_curves.c:118
static double c[64]