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lagarith.c
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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 "mathops.h"
33 #include "lagarithrac.h"
34 #include "lossless_videodsp.h"
35 #include "thread.h"
36 
38  FRAME_RAW = 1, /**< uncompressed */
39  FRAME_U_RGB24 = 2, /**< unaligned RGB24 */
40  FRAME_ARITH_YUY2 = 3, /**< arithmetic coded YUY2 */
41  FRAME_ARITH_RGB24 = 4, /**< arithmetic coded RGB24 */
42  FRAME_SOLID_GRAY = 5, /**< solid grayscale color frame */
43  FRAME_SOLID_COLOR = 6, /**< solid non-grayscale color frame */
44  FRAME_OLD_ARITH_RGB = 7, /**< obsolete arithmetic coded RGB (no longer encoded by upstream since version 1.1.0) */
45  FRAME_ARITH_RGBA = 8, /**< arithmetic coded RGBA */
46  FRAME_SOLID_RGBA = 9, /**< solid RGBA color frame */
47  FRAME_ARITH_YV12 = 10, /**< arithmetic coded YV12 */
48  FRAME_REDUCED_RES = 11, /**< reduced resolution YV12 frame */
49 };
50 
51 typedef struct LagarithContext {
54  int zeros; /**< number of consecutive zero bytes encountered */
55  int zeros_rem; /**< number of zero bytes remaining to output */
57 
58 /**
59  * Compute the 52-bit mantissa of 1/(double)denom.
60  * This crazy format uses floats in an entropy coder and we have to match x86
61  * rounding exactly, thus ordinary floats aren't portable enough.
62  * @param denom denominator
63  * @return 52-bit mantissa
64  * @see softfloat_mul
65  */
66 static uint64_t softfloat_reciprocal(uint32_t denom)
67 {
68  int shift = av_log2(denom - 1) + 1;
69  uint64_t ret = (1ULL << 52) / denom;
70  uint64_t err = (1ULL << 52) - ret * denom;
71  ret <<= shift;
72  err <<= shift;
73  err += denom / 2;
74  return ret + err / denom;
75 }
76 
77 /**
78  * (uint32_t)(x*f), where f has the given mantissa, and exponent 0
79  * Used in combination with softfloat_reciprocal computes x/(double)denom.
80  * @param x 32-bit integer factor
81  * @param mantissa mantissa of f with exponent 0
82  * @return 32-bit integer value (x*f)
83  * @see softfloat_reciprocal
84  */
85 static uint32_t softfloat_mul(uint32_t x, uint64_t mantissa)
86 {
87  uint64_t l = x * (mantissa & 0xffffffff);
88  uint64_t h = x * (mantissa >> 32);
89  h += l >> 32;
90  l &= 0xffffffff;
91  l += 1LL << av_log2(h >> 21);
92  h += l >> 32;
93  return h >> 20;
94 }
95 
96 static uint8_t lag_calc_zero_run(int8_t x)
97 {
98  return (x * 2) ^ (x >> 7);
99 }
100 
101 static int lag_decode_prob(GetBitContext *gb, uint32_t *value)
102 {
103  static const uint8_t series[] = { 1, 2, 3, 5, 8, 13, 21 };
104  int i;
105  int bit = 0;
106  int bits = 0;
107  int prevbit = 0;
108  unsigned val;
109 
110  for (i = 0; i < 7; i++) {
111  if (prevbit && bit)
112  break;
113  prevbit = bit;
114  bit = get_bits1(gb);
115  if (bit && !prevbit)
116  bits += series[i];
117  }
118  bits--;
119  if (bits < 0 || bits > 31) {
120  *value = 0;
121  return -1;
122  } else if (bits == 0) {
123  *value = 0;
124  return 0;
125  }
126 
127  val = get_bits_long(gb, bits);
128  val |= 1U << bits;
129 
130  *value = val - 1;
131 
132  return 0;
133 }
134 
136 {
137  int i, j, scale_factor;
138  unsigned prob, cumulative_target;
139  unsigned cumul_prob = 0;
140  unsigned scaled_cumul_prob = 0;
141  int nnz = 0;
142 
143  rac->prob[0] = 0;
144  rac->prob[257] = UINT_MAX;
145  /* Read probabilities from bitstream */
146  for (i = 1; i < 257; i++) {
147  if (lag_decode_prob(gb, &rac->prob[i]) < 0) {
148  av_log(rac->avctx, AV_LOG_ERROR, "Invalid probability encountered.\n");
149  return -1;
150  }
151  if ((uint64_t)cumul_prob + rac->prob[i] > UINT_MAX) {
152  av_log(rac->avctx, AV_LOG_ERROR, "Integer overflow encountered in cumulative probability calculation.\n");
153  return -1;
154  }
155  cumul_prob += rac->prob[i];
156  if (!rac->prob[i]) {
157  if (lag_decode_prob(gb, &prob)) {
158  av_log(rac->avctx, AV_LOG_ERROR, "Invalid probability run encountered.\n");
159  return -1;
160  }
161  if (prob > 256 - i)
162  prob = 256 - i;
163  for (j = 0; j < prob; j++)
164  rac->prob[++i] = 0;
165  }else {
166  nnz++;
167  }
168  }
169 
170  if (!cumul_prob) {
171  av_log(rac->avctx, AV_LOG_ERROR, "All probabilities are 0!\n");
172  return -1;
173  }
174 
175  if (nnz == 1 && (show_bits_long(gb, 32) & 0xFFFFFF)) {
176  return AVERROR_INVALIDDATA;
177  }
178 
179  /* Scale probabilities so cumulative probability is an even power of 2. */
180  scale_factor = av_log2(cumul_prob);
181 
182  if (cumul_prob & (cumul_prob - 1)) {
183  uint64_t mul = softfloat_reciprocal(cumul_prob);
184  for (i = 1; i <= 128; i++) {
185  rac->prob[i] = softfloat_mul(rac->prob[i], mul);
186  scaled_cumul_prob += rac->prob[i];
187  }
188  if (scaled_cumul_prob <= 0) {
189  av_log(rac->avctx, AV_LOG_ERROR, "Scaled probabilities invalid\n");
190  return AVERROR_INVALIDDATA;
191  }
192  for (; i < 257; i++) {
193  rac->prob[i] = softfloat_mul(rac->prob[i], mul);
194  scaled_cumul_prob += rac->prob[i];
195  }
196 
197  scale_factor++;
198  if (scale_factor >= 32U)
199  return AVERROR_INVALIDDATA;
200  cumulative_target = 1U << scale_factor;
201 
202  if (scaled_cumul_prob > cumulative_target) {
203  av_log(rac->avctx, AV_LOG_ERROR,
204  "Scaled probabilities are larger than target!\n");
205  return -1;
206  }
207 
208  scaled_cumul_prob = cumulative_target - scaled_cumul_prob;
209 
210  for (i = 1; scaled_cumul_prob; i = (i & 0x7f) + 1) {
211  if (rac->prob[i]) {
212  rac->prob[i]++;
213  scaled_cumul_prob--;
214  }
215  /* Comment from reference source:
216  * if (b & 0x80 == 0) { // order of operations is 'wrong'; it has been left this way
217  * // since the compression change is negligible and fixing it
218  * // breaks backwards compatibility
219  * b =- (signed int)b;
220  * b &= 0xFF;
221  * } else {
222  * b++;
223  * b &= 0x7f;
224  * }
225  */
226  }
227  }
228 
229  rac->scale = scale_factor;
230 
231  /* Fill probability array with cumulative probability for each symbol. */
232  for (i = 1; i < 257; i++)
233  rac->prob[i] += rac->prob[i - 1];
234 
235  return 0;
236 }
237 
239  uint8_t *diff, int w, int *left,
240  int *left_top)
241 {
242  /* This is almost identical to add_hfyu_median_pred in huffyuvdsp.h.
243  * However the &0xFF on the gradient predictor yields incorrect output
244  * for lagarith.
245  */
246  int i;
247  uint8_t l, lt;
248 
249  l = *left;
250  lt = *left_top;
251 
252  for (i = 0; i < w; i++) {
253  l = mid_pred(l, src1[i], l + src1[i] - lt) + diff[i];
254  lt = src1[i];
255  dst[i] = l;
256  }
257 
258  *left = l;
259  *left_top = lt;
260 }
261 
263  int width, int stride, int line)
264 {
265  int L, TL;
266 
267  if (!line) {
268  /* Left prediction only for first line */
269  L = l->llviddsp.add_left_pred(buf, buf, width, 0);
270  } else {
271  /* Left pixel is actually prev_row[width] */
272  L = buf[width - stride - 1];
273 
274  if (line == 1) {
275  /* Second line, left predict first pixel, the rest of the line is median predicted
276  * NOTE: In the case of RGB this pixel is top predicted */
277  TL = l->avctx->pix_fmt == AV_PIX_FMT_YUV420P ? buf[-stride] : L;
278  } else {
279  /* Top left is 2 rows back, last pixel */
280  TL = buf[width - (2 * stride) - 1];
281  }
282 
283  add_lag_median_prediction(buf, buf - stride, buf,
284  width, &L, &TL);
285  }
286 }
287 
289  int width, int stride, int line,
290  int is_luma)
291 {
292  int L, TL;
293 
294  if (!line) {
295  L= buf[0];
296  if (is_luma)
297  buf[0] = 0;
298  l->llviddsp.add_left_pred(buf, buf, width, 0);
299  if (is_luma)
300  buf[0] = L;
301  return;
302  }
303  if (line == 1) {
304  const int HEAD = is_luma ? 4 : 2;
305  int i;
306 
307  L = buf[width - stride - 1];
308  TL = buf[HEAD - stride - 1];
309  for (i = 0; i < HEAD; i++) {
310  L += buf[i];
311  buf[i] = L;
312  }
313  for (; i < width; i++) {
314  L = mid_pred(L & 0xFF, buf[i - stride], (L + buf[i - stride] - TL) & 0xFF) + buf[i];
315  TL = buf[i - stride];
316  buf[i] = L;
317  }
318  } else {
319  TL = buf[width - (2 * stride) - 1];
320  L = buf[width - stride - 1];
321  l->llviddsp.add_median_pred(buf, buf - stride, buf, width, &L, &TL);
322  }
323 }
324 
326  uint8_t *dst, int width, int stride,
327  int esc_count)
328 {
329  int i = 0;
330  int ret = 0;
331 
332  if (!esc_count)
333  esc_count = -1;
334 
335  /* Output any zeros remaining from the previous run */
336 handle_zeros:
337  if (l->zeros_rem) {
338  int count = FFMIN(l->zeros_rem, width - i);
339  memset(dst + i, 0, count);
340  i += count;
341  l->zeros_rem -= count;
342  }
343 
344  while (i < width) {
345  dst[i] = lag_get_rac(rac);
346  ret++;
347 
348  if (dst[i])
349  l->zeros = 0;
350  else
351  l->zeros++;
352 
353  i++;
354  if (l->zeros == esc_count) {
355  int index = lag_get_rac(rac);
356  ret++;
357 
358  l->zeros = 0;
359 
360  l->zeros_rem = lag_calc_zero_run(index);
361  goto handle_zeros;
362  }
363  }
364  return ret;
365 }
366 
368  const uint8_t *src, const uint8_t *src_end,
369  int width, int esc_count)
370 {
371  int i = 0;
372  int count;
373  uint8_t zero_run = 0;
374  const uint8_t *src_start = src;
375  uint8_t mask1 = -(esc_count < 2);
376  uint8_t mask2 = -(esc_count < 3);
377  uint8_t *end = dst + (width - 2);
378 
379  avpriv_request_sample(l->avctx, "zero_run_line");
380 
381  memset(dst, 0, width);
382 
383 output_zeros:
384  if (l->zeros_rem) {
385  count = FFMIN(l->zeros_rem, width - i);
386  if (end - dst < count) {
387  av_log(l->avctx, AV_LOG_ERROR, "Too many zeros remaining.\n");
388  return AVERROR_INVALIDDATA;
389  }
390 
391  memset(dst, 0, count);
392  l->zeros_rem -= count;
393  dst += count;
394  }
395 
396  while (dst < end) {
397  i = 0;
398  while (!zero_run && dst + i < end) {
399  i++;
400  if (i+2 >= src_end - src)
401  return AVERROR_INVALIDDATA;
402  zero_run =
403  !(src[i] | (src[i + 1] & mask1) | (src[i + 2] & mask2));
404  }
405  if (zero_run) {
406  zero_run = 0;
407  i += esc_count;
408  memcpy(dst, src, i);
409  dst += i;
410  l->zeros_rem = lag_calc_zero_run(src[i]);
411 
412  src += i + 1;
413  goto output_zeros;
414  } else {
415  memcpy(dst, src, i);
416  src += i;
417  dst += i;
418  }
419  }
420  return src - src_start;
421 }
422 
423 
424 
426  int width, int height, int stride,
427  const uint8_t *src, int src_size)
428 {
429  int i = 0;
430  int read = 0;
431  uint32_t length;
432  uint32_t offset = 1;
433  int esc_count;
434  GetBitContext gb;
435  lag_rac rac;
436  const uint8_t *src_end = src + src_size;
437  int ret;
438 
439  rac.avctx = l->avctx;
440  l->zeros = 0;
441 
442  if(src_size < 2)
443  return AVERROR_INVALIDDATA;
444 
445  esc_count = src[0];
446  if (esc_count < 4) {
447  length = width * height;
448  if(src_size < 5)
449  return AVERROR_INVALIDDATA;
450  if (esc_count && AV_RL32(src + 1) < length) {
451  length = AV_RL32(src + 1);
452  offset += 4;
453  }
454 
455  if ((ret = init_get_bits8(&gb, src + offset, src_size - offset)) < 0)
456  return ret;
457 
458  if (lag_read_prob_header(&rac, &gb) < 0)
459  return -1;
460 
461  ff_lag_rac_init(&rac, &gb, length - stride);
462  for (i = 0; i < height; i++) {
463  if (rac.overread > MAX_OVERREAD)
464  return AVERROR_INVALIDDATA;
465  read += lag_decode_line(l, &rac, dst + (i * stride), width,
466  stride, esc_count);
467  }
468 
469  if (read > length)
471  "Output more bytes than length (%d of %"PRIu32")\n", read,
472  length);
473  } else if (esc_count < 8) {
474  esc_count -= 4;
475  src ++;
476  src_size --;
477  if (esc_count > 0) {
478  /* Zero run coding only, no range coding. */
479  for (i = 0; i < height; i++) {
480  int res = lag_decode_zero_run_line(l, dst + (i * stride), src,
481  src_end, width, esc_count);
482  if (res < 0)
483  return res;
484  src += res;
485  }
486  } else {
487  if (src_size < width * height)
488  return AVERROR_INVALIDDATA; // buffer not big enough
489  /* Plane is stored uncompressed */
490  for (i = 0; i < height; i++) {
491  memcpy(dst + (i * stride), src, width);
492  src += width;
493  }
494  }
495  } else if (esc_count == 0xff) {
496  /* Plane is a solid run of given value */
497  for (i = 0; i < height; i++)
498  memset(dst + i * stride, src[1], width);
499  /* Do not apply prediction.
500  Note: memset to 0 above, setting first value to src[1]
501  and applying prediction gives the same result. */
502  return 0;
503  } else {
505  "Invalid zero run escape code! (%#x)\n", esc_count);
506  return -1;
507  }
508 
509  if (l->avctx->pix_fmt != AV_PIX_FMT_YUV422P) {
510  for (i = 0; i < height; i++) {
511  lag_pred_line(l, dst, width, stride, i);
512  dst += stride;
513  }
514  } else {
515  for (i = 0; i < height; i++) {
516  lag_pred_line_yuy2(l, dst, width, stride, i,
517  width == l->avctx->width);
518  dst += stride;
519  }
520  }
521 
522  return 0;
523 }
524 
525 /**
526  * Decode a frame.
527  * @param avctx codec context
528  * @param data output AVFrame
529  * @param data_size size of output data or 0 if no picture is returned
530  * @param avpkt input packet
531  * @return number of consumed bytes on success or negative if decode fails
532  */
534  void *data, int *got_frame, AVPacket *avpkt)
535 {
536  const uint8_t *buf = avpkt->data;
537  unsigned int buf_size = avpkt->size;
538  LagarithContext *l = avctx->priv_data;
539  ThreadFrame frame = { .f = data };
540  AVFrame *const p = data;
541  uint8_t frametype;
542  uint32_t offset_gu = 0, offset_bv = 0, offset_ry = 9;
543  uint32_t offs[4];
544  uint8_t *srcs[4];
545  int i, j, planes = 3;
546  int ret;
547 
548  p->key_frame = 1;
550 
551  frametype = buf[0];
552 
553  offset_gu = AV_RL32(buf + 1);
554  offset_bv = AV_RL32(buf + 5);
555 
556  switch (frametype) {
557  case FRAME_SOLID_RGBA:
558  avctx->pix_fmt = AV_PIX_FMT_GBRAP;
559  case FRAME_SOLID_GRAY:
560  if (frametype == FRAME_SOLID_GRAY)
561  if (avctx->bits_per_coded_sample == 24) {
562  avctx->pix_fmt = AV_PIX_FMT_GBRP;
563  } else {
564  avctx->pix_fmt = AV_PIX_FMT_GBRAP;
565  planes = 4;
566  }
567 
568  if ((ret = ff_thread_get_buffer(avctx, &frame, 0)) < 0)
569  return ret;
570 
571  if (frametype == FRAME_SOLID_RGBA) {
572  for (i = 0; i < avctx->height; i++) {
573  memset(p->data[0] + i * p->linesize[0], buf[2], avctx->width);
574  memset(p->data[1] + i * p->linesize[1], buf[1], avctx->width);
575  memset(p->data[2] + i * p->linesize[2], buf[3], avctx->width);
576  memset(p->data[3] + i * p->linesize[3], buf[4], avctx->width);
577  }
578  } else {
579  for (i = 0; i < avctx->height; i++) {
580  for (j = 0; j < planes; j++)
581  memset(p->data[j] + i * p->linesize[j], buf[1], avctx->width);
582  }
583  }
584  break;
585  case FRAME_SOLID_COLOR:
586  if (avctx->bits_per_coded_sample == 24) {
587  avctx->pix_fmt = AV_PIX_FMT_GBRP;
588  } else {
589  avctx->pix_fmt = AV_PIX_FMT_GBRAP;
590  }
591 
592  if ((ret = ff_thread_get_buffer(avctx, &frame,0)) < 0)
593  return ret;
594 
595  for (i = 0; i < avctx->height; i++) {
596  memset(p->data[0] + i * p->linesize[0], buf[2], avctx->width);
597  memset(p->data[1] + i * p->linesize[1], buf[1], avctx->width);
598  memset(p->data[2] + i * p->linesize[2], buf[3], avctx->width);
599  if (avctx->pix_fmt == AV_PIX_FMT_GBRAP)
600  memset(p->data[3] + i * p->linesize[3], 0xFFu, avctx->width);
601  }
602  break;
603  case FRAME_ARITH_RGBA:
604  avctx->pix_fmt = AV_PIX_FMT_GBRAP;
605  planes = 4;
606  offset_ry += 4;
607  offs[3] = AV_RL32(buf + 9);
608  case FRAME_ARITH_RGB24:
609  case FRAME_U_RGB24:
610  if (frametype == FRAME_ARITH_RGB24 || frametype == FRAME_U_RGB24)
611  avctx->pix_fmt = AV_PIX_FMT_GBRP;
612 
613  if ((ret = ff_thread_get_buffer(avctx, &frame, 0)) < 0)
614  return ret;
615 
616  offs[0] = offset_bv;
617  offs[1] = offset_gu;
618  offs[2] = offset_ry;
619 
620  for (i = 0; i < planes; i++)
621  srcs[i] = p->data[i] + (avctx->height - 1) * p->linesize[i];
622  for (i = 0; i < planes; i++)
623  if (buf_size <= offs[i]) {
624  av_log(avctx, AV_LOG_ERROR,
625  "Invalid frame offsets\n");
626  return AVERROR_INVALIDDATA;
627  }
628 
629  for (i = 0; i < planes; i++)
630  lag_decode_arith_plane(l, srcs[i],
631  avctx->width, avctx->height,
632  -p->linesize[i], buf + offs[i],
633  buf_size - offs[i]);
634  for (i = 0; i < avctx->height; i++) {
635  l->llviddsp.add_bytes(p->data[0] + i * p->linesize[0], p->data[1] + i * p->linesize[1], avctx->width);
636  l->llviddsp.add_bytes(p->data[2] + i * p->linesize[2], p->data[1] + i * p->linesize[1], avctx->width);
637  }
638  FFSWAP(uint8_t*, p->data[0], p->data[1]);
639  FFSWAP(int, p->linesize[0], p->linesize[1]);
640  FFSWAP(uint8_t*, p->data[2], p->data[1]);
641  FFSWAP(int, p->linesize[2], p->linesize[1]);
642  break;
643  case FRAME_ARITH_YUY2:
644  avctx->pix_fmt = AV_PIX_FMT_YUV422P;
645 
646  if ((ret = ff_thread_get_buffer(avctx, &frame, 0)) < 0)
647  return ret;
648 
649  if (offset_ry >= buf_size ||
650  offset_gu >= buf_size ||
651  offset_bv >= buf_size) {
652  av_log(avctx, AV_LOG_ERROR,
653  "Invalid frame offsets\n");
654  return AVERROR_INVALIDDATA;
655  }
656 
657  lag_decode_arith_plane(l, p->data[0], avctx->width, avctx->height,
658  p->linesize[0], buf + offset_ry,
659  buf_size - offset_ry);
660  lag_decode_arith_plane(l, p->data[1], (avctx->width + 1) / 2,
661  avctx->height, p->linesize[1],
662  buf + offset_gu, buf_size - offset_gu);
663  lag_decode_arith_plane(l, p->data[2], (avctx->width + 1) / 2,
664  avctx->height, p->linesize[2],
665  buf + offset_bv, buf_size - offset_bv);
666  break;
667  case FRAME_ARITH_YV12:
668  avctx->pix_fmt = AV_PIX_FMT_YUV420P;
669 
670  if ((ret = ff_thread_get_buffer(avctx, &frame, 0)) < 0)
671  return ret;
672  if (buf_size <= offset_ry || buf_size <= offset_gu || buf_size <= offset_bv) {
673  return AVERROR_INVALIDDATA;
674  }
675 
676  if (offset_ry >= buf_size ||
677  offset_gu >= buf_size ||
678  offset_bv >= buf_size) {
679  av_log(avctx, AV_LOG_ERROR,
680  "Invalid frame offsets\n");
681  return AVERROR_INVALIDDATA;
682  }
683 
684  lag_decode_arith_plane(l, p->data[0], avctx->width, avctx->height,
685  p->linesize[0], buf + offset_ry,
686  buf_size - offset_ry);
687  lag_decode_arith_plane(l, p->data[2], (avctx->width + 1) / 2,
688  (avctx->height + 1) / 2, p->linesize[2],
689  buf + offset_gu, buf_size - offset_gu);
690  lag_decode_arith_plane(l, p->data[1], (avctx->width + 1) / 2,
691  (avctx->height + 1) / 2, p->linesize[1],
692  buf + offset_bv, buf_size - offset_bv);
693  break;
694  default:
695  av_log(avctx, AV_LOG_ERROR,
696  "Unsupported Lagarith frame type: %#"PRIx8"\n", frametype);
697  return AVERROR_PATCHWELCOME;
698  }
699 
700  *got_frame = 1;
701 
702  return buf_size;
703 }
704 
706 {
707  LagarithContext *l = avctx->priv_data;
708  l->avctx = avctx;
709 
711 
712  return 0;
713 }
714 
715 #if HAVE_THREADS
716 static av_cold int lag_decode_init_thread_copy(AVCodecContext *avctx)
717 {
718  LagarithContext *l = avctx->priv_data;
719  l->avctx = avctx;
720 
721  return 0;
722 }
723 #endif
724 
726  .name = "lagarith",
727  .long_name = NULL_IF_CONFIG_SMALL("Lagarith lossless"),
728  .type = AVMEDIA_TYPE_VIDEO,
729  .id = AV_CODEC_ID_LAGARITH,
730  .priv_data_size = sizeof(LagarithContext),
732  .init_thread_copy = ONLY_IF_THREADS_ENABLED(lag_decode_init_thread_copy),
733  .decode = lag_decode_frame,
735 };
static unsigned int show_bits_long(GetBitContext *s, int n)
Show 0-32 bits.
Definition: get_bits.h:587
AVCodecContext * avctx
Definition: lagarithrac.h:40
static uint8_t lag_get_rac(lag_rac *l)
Decode a single byte from the compressed plane described by *l.
Definition: lagarithrac.h:78
const char const char void * val
Definition: avisynth_c.h:771
#define AVERROR_INVALIDDATA
Invalid data found when processing input.
Definition: error.h:59
static int shift(int a, int b)
Definition: sonic.c:82
This structure describes decoded (raw) audio or video data.
Definition: frame.h:226
ptrdiff_t const GLvoid * data
Definition: opengl_enc.c:101
void ff_lag_rac_init(lag_rac *l, GetBitContext *gb, int length)
Definition: lagarithrac.c:33
#define AV_LOG_WARNING
Something somehow does not look correct.
Definition: log.h:182
static int init_thread_copy(AVCodecContext *avctx)
Definition: tta.c:392
static av_cold int init(AVCodecContext *avctx)
Definition: avrndec.c:35
planar GBR 4:4:4 24bpp
Definition: pixfmt.h:168
int size
Definition: avcodec.h:1453
int av_log2(unsigned v)
Definition: intmath.c:26
enum AVPixelFormat pix_fmt
Pixel format, see AV_PIX_FMT_xxx.
Definition: avcodec.h:1750
#define src
Definition: vp8dsp.c:254
AVCodec.
Definition: avcodec.h:3441
static int lag_decode_arith_plane(LagarithContext *l, uint8_t *dst, int width, int height, int stride, const uint8_t *src, int src_size)
Definition: lagarith.c:425
int zeros
number of consecutive zero bytes encountered
Definition: lagarith.c:54
void(* add_bytes)(uint8_t *dst, uint8_t *src, ptrdiff_t w)
AVCodec ff_lagarith_decoder
Definition: lagarith.c:725
void void avpriv_request_sample(void *avc, const char *msg,...) av_printf_format(2
Log a generic warning message about a missing feature.
static int lag_decode_zero_run_line(LagarithContext *l, uint8_t *dst, const uint8_t *src, const uint8_t *src_end, int width, int esc_count)
Definition: lagarith.c:367
Lagarith range decoder.
uint8_t
#define av_cold
Definition: attributes.h:82
solid grayscale color frame
Definition: lagarith.c:42
static av_cold int end(AVCodecContext *avctx)
Definition: avrndec.c:90
static void lag_pred_line(LagarithContext *l, uint8_t *buf, int width, int stride, int line)
Definition: lagarith.c:262
Multithreading support functions.
int zeros_rem
number of zero bytes remaining to output
Definition: lagarith.c:55
static AVFrame * frame
#define height
unsigned scale
Number of bits of precision in range.
Definition: lagarithrac.h:43
uint8_t * data
Definition: avcodec.h:1452
bitstream reader API header.
int bits_per_coded_sample
bits per sample/pixel from the demuxer (needed for huffyuv).
Definition: avcodec.h:2760
#define av_log(a,...)
#define prob(name, subs,...)
Definition: cbs_vp9.c:374
#define U(x)
Definition: vp56_arith.h:37
uncompressed
Definition: lagarith.c:38
LagarithFrameType
Definition: lagarith.c:37
arithmetic coded RGB24
Definition: lagarith.c:41
#define AV_LOG_ERROR
Something went wrong and cannot losslessly be recovered.
Definition: log.h:176
static void add_lag_median_prediction(uint8_t *dst, uint8_t *src1, uint8_t *diff, int w, int *left, int *left_top)
Definition: lagarith.c:238
#define NULL_IF_CONFIG_SMALL(x)
Return NULL if CONFIG_SMALL is true, otherwise the argument without modification. ...
Definition: internal.h:186
AVCodecContext * avctx
Definition: lagarith.c:52
Definition: graph2dot.c:48
GLsizei GLsizei * length
Definition: opengl_enc.c:115
const char * name
Name of the codec implementation.
Definition: avcodec.h:3448
static const uint8_t offset[127][2]
Definition: vf_spp.c:92
GLsizei count
Definition: opengl_enc.c:109
#define AV_CODEC_CAP_FRAME_THREADS
Codec supports frame-level multithreading.
Definition: avcodec.h:1024
static const struct @305 planes[]
static av_cold int lag_decode_init(AVCodecContext *avctx)
Definition: lagarith.c:705
planar YUV 4:2:2, 16bpp, (1 Cr & Cb sample per 2x1 Y samples)
Definition: pixfmt.h:70
#define ONLY_IF_THREADS_ENABLED(x)
Define a function with only the non-default version specified.
Definition: internal.h:225
arithmetic coded YV12
Definition: lagarith.c:47
static uint64_t softfloat_reciprocal(uint32_t denom)
Compute the 52-bit mantissa of 1/(double)denom.
Definition: lagarith.c:66
enum AVPictureType pict_type
Picture type of the frame.
Definition: frame.h:309
obsolete arithmetic coded RGB (no longer encoded by upstream since version 1.1.0) ...
Definition: lagarith.c:44
#define FFMIN(a, b)
Definition: common.h:96
#define width
int width
picture width / height.
Definition: avcodec.h:1713
uint8_t w
Definition: llviddspenc.c:38
GLsizei GLboolean const GLfloat * value
Definition: opengl_enc.c:109
arithmetic coded YUY2
Definition: lagarith.c:40
static int lag_decode_frame(AVCodecContext *avctx, void *data, int *got_frame, AVPacket *avpkt)
Decode a frame.
Definition: lagarith.c:533
static int lag_decode_prob(GetBitContext *gb, uint32_t *value)
Definition: lagarith.c:101
#define L(x)
Definition: vp56_arith.h:36
#define AVERROR_PATCHWELCOME
Not yet implemented in FFmpeg, patches welcome.
Definition: error.h:62
#define src1
Definition: h264pred.c:139
static int lag_decode_line(LagarithContext *l, lag_rac *rac, uint8_t *dst, int width, int stride, int esc_count)
Definition: lagarith.c:325
Libavcodec external API header.
uint32_t prob[258]
Table of cumulative probability for each symbol.
Definition: lagarithrac.h:53
int linesize[AV_NUM_DATA_POINTERS]
For video, size in bytes of each picture line.
Definition: frame.h:257
static int init_get_bits8(GetBitContext *s, const uint8_t *buffer, int byte_size)
Initialize GetBitContext.
Definition: get_bits.h:650
static uint32_t softfloat_mul(uint32_t x, uint64_t mantissa)
(uint32_t)(x*f), where f has the given mantissa, and exponent 0 Used in combination with softfloat_re...
Definition: lagarith.c:85
int ff_thread_get_buffer(AVCodecContext *avctx, ThreadFrame *f, int flags)
Wrapper around get_buffer() for frame-multithreaded codecs.
main external API structure.
Definition: avcodec.h:1540
void * buf
Definition: avisynth_c.h:690
int overread
Definition: lagarithrac.h:50
void ff_llviddsp_init(LLVidDSPContext *c)
static unsigned int get_bits1(GetBitContext *s)
Definition: get_bits.h:487
int index
Definition: gxfenc.c:89
#define MAX_OVERREAD
Definition: lagarithrac.h:51
#define mid_pred
Definition: mathops.h:97
static int lag_read_prob_header(lag_rac *rac, GetBitContext *gb)
Definition: lagarith.c:135
static unsigned int get_bits_long(GetBitContext *s, int n)
Read 0-32 bits.
Definition: get_bits.h:531
uint8_t * data[AV_NUM_DATA_POINTERS]
pointer to the picture/channel planes.
Definition: frame.h:240
GLint GLenum GLboolean GLsizei stride
Definition: opengl_enc.c:105
LLVidDSPContext llviddsp
Definition: lagarith.c:53
planar YUV 4:2:0, 12bpp, (1 Cr & Cb sample per 2x2 Y samples)
Definition: pixfmt.h:66
planar GBRA 4:4:4:4 32bpp
Definition: pixfmt.h:215
solid non-grayscale color frame
Definition: lagarith.c:43
void * priv_data
Definition: avcodec.h:1567
static uint8_t lag_calc_zero_run(int8_t x)
Definition: lagarith.c:96
static av_always_inline int diff(const uint32_t a, const uint32_t b)
int(* add_left_pred)(uint8_t *dst, const uint8_t *src, ptrdiff_t w, int left)
static void lag_pred_line_yuy2(LagarithContext *l, uint8_t *buf, int width, int stride, int line, int is_luma)
Definition: lagarith.c:288
int key_frame
1 -> keyframe, 0-> not
Definition: frame.h:304
solid RGBA color frame
Definition: lagarith.c:46
arithmetic coded RGBA
Definition: lagarith.c:45
reduced resolution YV12 frame
Definition: lagarith.c:48
unaligned RGB24
Definition: lagarith.c:39
#define FFSWAP(type, a, b)
Definition: common.h:99
#define stride
uint64_t_TMPL AV_WL64 unsigned int_TMPL AV_RL32
Definition: bytestream.h:87
This structure stores compressed data.
Definition: avcodec.h:1429
#define AV_CODEC_CAP_DR1
Codec uses get_buffer() for allocating buffers and supports custom allocators.
Definition: avcodec.h:968
void(* add_median_pred)(uint8_t *dst, const uint8_t *top, const uint8_t *diff, ptrdiff_t w, int *left, int *left_top)