FFmpeg  4.3
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  if (scale_factor > 23)
230  return AVERROR_INVALIDDATA;
231 
232  rac->scale = scale_factor;
233 
234  /* Fill probability array with cumulative probability for each symbol. */
235  for (i = 1; i < 257; i++)
236  rac->prob[i] += rac->prob[i - 1];
237 
238  return 0;
239 }
240 
242  uint8_t *diff, int w, int *left,
243  int *left_top)
244 {
245  /* This is almost identical to add_hfyu_median_pred in huffyuvdsp.h.
246  * However the &0xFF on the gradient predictor yields incorrect output
247  * for lagarith.
248  */
249  int i;
250  uint8_t l, lt;
251 
252  l = *left;
253  lt = *left_top;
254 
255  for (i = 0; i < w; i++) {
256  l = mid_pred(l, src1[i], l + src1[i] - lt) + diff[i];
257  lt = src1[i];
258  dst[i] = l;
259  }
260 
261  *left = l;
262  *left_top = lt;
263 }
264 
265 static void lag_pred_line(LagarithContext *l, uint8_t *buf,
266  int width, int stride, int line)
267 {
268  int L, TL;
269 
270  if (!line) {
271  /* Left prediction only for first line */
272  L = l->llviddsp.add_left_pred(buf, buf, width, 0);
273  } else {
274  /* Left pixel is actually prev_row[width] */
275  L = buf[width - stride - 1];
276 
277  if (line == 1) {
278  /* Second line, left predict first pixel, the rest of the line is median predicted
279  * NOTE: In the case of RGB this pixel is top predicted */
280  TL = l->avctx->pix_fmt == AV_PIX_FMT_YUV420P ? buf[-stride] : L;
281  } else {
282  /* Top left is 2 rows back, last pixel */
283  TL = buf[width - (2 * stride) - 1];
284  }
285 
286  add_lag_median_prediction(buf, buf - stride, buf,
287  width, &L, &TL);
288  }
289 }
290 
292  int width, int stride, int line,
293  int is_luma)
294 {
295  int L, TL;
296 
297  if (!line) {
298  L= buf[0];
299  if (is_luma)
300  buf[0] = 0;
301  l->llviddsp.add_left_pred(buf, buf, width, 0);
302  if (is_luma)
303  buf[0] = L;
304  return;
305  }
306  if (line == 1) {
307  const int HEAD = is_luma ? 4 : 2;
308  int i;
309 
310  L = buf[width - stride - 1];
311  TL = buf[HEAD - stride - 1];
312  for (i = 0; i < HEAD; i++) {
313  L += buf[i];
314  buf[i] = L;
315  }
316  for (; i < width; i++) {
317  L = mid_pred(L & 0xFF, buf[i - stride], (L + buf[i - stride] - TL) & 0xFF) + buf[i];
318  TL = buf[i - stride];
319  buf[i] = L;
320  }
321  } else {
322  TL = buf[width - (2 * stride) - 1];
323  L = buf[width - stride - 1];
324  l->llviddsp.add_median_pred(buf, buf - stride, buf, width, &L, &TL);
325  }
326 }
327 
329  uint8_t *dst, int width, int stride,
330  int esc_count)
331 {
332  int i = 0;
333  int ret = 0;
334 
335  if (!esc_count)
336  esc_count = -1;
337 
338  /* Output any zeros remaining from the previous run */
339 handle_zeros:
340  if (l->zeros_rem) {
341  int count = FFMIN(l->zeros_rem, width - i);
342  memset(dst + i, 0, count);
343  i += count;
344  l->zeros_rem -= count;
345  }
346 
347  while (i < width) {
348  dst[i] = lag_get_rac(rac);
349  ret++;
350 
351  if (dst[i])
352  l->zeros = 0;
353  else
354  l->zeros++;
355 
356  i++;
357  if (l->zeros == esc_count) {
358  int index = lag_get_rac(rac);
359  ret++;
360 
361  l->zeros = 0;
362 
363  l->zeros_rem = lag_calc_zero_run(index);
364  goto handle_zeros;
365  }
366  }
367  return ret;
368 }
369 
371  const uint8_t *src, const uint8_t *src_end,
372  int width, int esc_count)
373 {
374  int i = 0;
375  int count;
376  uint8_t zero_run = 0;
377  const uint8_t *src_start = src;
378  uint8_t mask1 = -(esc_count < 2);
379  uint8_t mask2 = -(esc_count < 3);
380  uint8_t *end = dst + (width - 2);
381 
382  avpriv_request_sample(l->avctx, "zero_run_line");
383 
384  memset(dst, 0, width);
385 
386 output_zeros:
387  if (l->zeros_rem) {
388  count = FFMIN(l->zeros_rem, width - i);
389  if (end - dst < count) {
390  av_log(l->avctx, AV_LOG_ERROR, "Too many zeros remaining.\n");
391  return AVERROR_INVALIDDATA;
392  }
393 
394  memset(dst, 0, count);
395  l->zeros_rem -= count;
396  dst += count;
397  }
398 
399  while (dst < end) {
400  i = 0;
401  while (!zero_run && dst + i < end) {
402  i++;
403  if (i+2 >= src_end - src)
404  return AVERROR_INVALIDDATA;
405  zero_run =
406  !(src[i] | (src[i + 1] & mask1) | (src[i + 2] & mask2));
407  }
408  if (zero_run) {
409  zero_run = 0;
410  i += esc_count;
411  memcpy(dst, src, i);
412  dst += i;
413  l->zeros_rem = lag_calc_zero_run(src[i]);
414 
415  src += i + 1;
416  goto output_zeros;
417  } else {
418  memcpy(dst, src, i);
419  src += i;
420  dst += i;
421  }
422  }
423  return src - src_start;
424 }
425 
426 
427 
429  int width, int height, int stride,
430  const uint8_t *src, int src_size)
431 {
432  int i = 0;
433  int read = 0;
434  uint32_t length;
435  uint32_t offset = 1;
436  int esc_count;
437  GetBitContext gb;
438  lag_rac rac;
439  const uint8_t *src_end = src + src_size;
440  int ret;
441 
442  rac.avctx = l->avctx;
443  l->zeros = 0;
444 
445  if(src_size < 2)
446  return AVERROR_INVALIDDATA;
447 
448  esc_count = src[0];
449  if (esc_count < 4) {
450  length = width * height;
451  if(src_size < 5)
452  return AVERROR_INVALIDDATA;
453  if (esc_count && AV_RL32(src + 1) < length) {
454  length = AV_RL32(src + 1);
455  offset += 4;
456  }
457 
458  if ((ret = init_get_bits8(&gb, src + offset, src_size - offset)) < 0)
459  return ret;
460 
461  if (lag_read_prob_header(&rac, &gb) < 0)
462  return -1;
463 
464  ff_lag_rac_init(&rac, &gb, length - stride);
465  for (i = 0; i < height; i++) {
466  if (rac.overread > MAX_OVERREAD)
467  return AVERROR_INVALIDDATA;
468  read += lag_decode_line(l, &rac, dst + (i * stride), width,
469  stride, esc_count);
470  }
471 
472  if (read > length)
474  "Output more bytes than length (%d of %"PRIu32")\n", read,
475  length);
476  } else if (esc_count < 8) {
477  esc_count -= 4;
478  src ++;
479  src_size --;
480  if (esc_count > 0) {
481  /* Zero run coding only, no range coding. */
482  for (i = 0; i < height; i++) {
483  int res = lag_decode_zero_run_line(l, dst + (i * stride), src,
484  src_end, width, esc_count);
485  if (res < 0)
486  return res;
487  src += res;
488  }
489  } else {
490  if (src_size < width * height)
491  return AVERROR_INVALIDDATA; // buffer not big enough
492  /* Plane is stored uncompressed */
493  for (i = 0; i < height; i++) {
494  memcpy(dst + (i * stride), src, width);
495  src += width;
496  }
497  }
498  } else if (esc_count == 0xff) {
499  /* Plane is a solid run of given value */
500  for (i = 0; i < height; i++)
501  memset(dst + i * stride, src[1], width);
502  /* Do not apply prediction.
503  Note: memset to 0 above, setting first value to src[1]
504  and applying prediction gives the same result. */
505  return 0;
506  } else {
508  "Invalid zero run escape code! (%#x)\n", esc_count);
509  return -1;
510  }
511 
512  if (l->avctx->pix_fmt != AV_PIX_FMT_YUV422P) {
513  for (i = 0; i < height; i++) {
514  lag_pred_line(l, dst, width, stride, i);
515  dst += stride;
516  }
517  } else {
518  for (i = 0; i < height; i++) {
519  lag_pred_line_yuy2(l, dst, width, stride, i,
520  width == l->avctx->width);
521  dst += stride;
522  }
523  }
524 
525  return 0;
526 }
527 
528 /**
529  * Decode a frame.
530  * @param avctx codec context
531  * @param data output AVFrame
532  * @param data_size size of output data or 0 if no picture is returned
533  * @param avpkt input packet
534  * @return number of consumed bytes on success or negative if decode fails
535  */
537  void *data, int *got_frame, AVPacket *avpkt)
538 {
539  const uint8_t *buf = avpkt->data;
540  unsigned int buf_size = avpkt->size;
541  LagarithContext *l = avctx->priv_data;
542  ThreadFrame frame = { .f = data };
543  AVFrame *const p = data;
544  uint8_t frametype;
545  uint32_t offset_gu = 0, offset_bv = 0, offset_ry = 9;
546  uint32_t offs[4];
547  uint8_t *srcs[4];
548  int i, j, planes = 3;
549  int ret;
550 
551  p->key_frame = 1;
553 
554  frametype = buf[0];
555 
556  offset_gu = AV_RL32(buf + 1);
557  offset_bv = AV_RL32(buf + 5);
558 
559  switch (frametype) {
560  case FRAME_SOLID_RGBA:
561  avctx->pix_fmt = AV_PIX_FMT_GBRAP;
562  case FRAME_SOLID_GRAY:
563  if (frametype == FRAME_SOLID_GRAY)
564  if (avctx->bits_per_coded_sample == 24) {
565  avctx->pix_fmt = AV_PIX_FMT_GBRP;
566  } else {
567  avctx->pix_fmt = AV_PIX_FMT_GBRAP;
568  planes = 4;
569  }
570 
571  if ((ret = ff_thread_get_buffer(avctx, &frame, 0)) < 0)
572  return ret;
573 
574  if (frametype == FRAME_SOLID_RGBA) {
575  for (i = 0; i < avctx->height; i++) {
576  memset(p->data[0] + i * p->linesize[0], buf[2], avctx->width);
577  memset(p->data[1] + i * p->linesize[1], buf[1], avctx->width);
578  memset(p->data[2] + i * p->linesize[2], buf[3], avctx->width);
579  memset(p->data[3] + i * p->linesize[3], buf[4], avctx->width);
580  }
581  } else {
582  for (i = 0; i < avctx->height; i++) {
583  for (j = 0; j < planes; j++)
584  memset(p->data[j] + i * p->linesize[j], buf[1], avctx->width);
585  }
586  }
587  break;
588  case FRAME_SOLID_COLOR:
589  if (avctx->bits_per_coded_sample == 24) {
590  avctx->pix_fmt = AV_PIX_FMT_GBRP;
591  } else {
592  avctx->pix_fmt = AV_PIX_FMT_GBRAP;
593  }
594 
595  if ((ret = ff_thread_get_buffer(avctx, &frame,0)) < 0)
596  return ret;
597 
598  for (i = 0; i < avctx->height; i++) {
599  memset(p->data[0] + i * p->linesize[0], buf[2], avctx->width);
600  memset(p->data[1] + i * p->linesize[1], buf[1], avctx->width);
601  memset(p->data[2] + i * p->linesize[2], buf[3], avctx->width);
602  if (avctx->pix_fmt == AV_PIX_FMT_GBRAP)
603  memset(p->data[3] + i * p->linesize[3], 0xFFu, avctx->width);
604  }
605  break;
606  case FRAME_ARITH_RGBA:
607  avctx->pix_fmt = AV_PIX_FMT_GBRAP;
608  planes = 4;
609  offset_ry += 4;
610  offs[3] = AV_RL32(buf + 9);
611  case FRAME_ARITH_RGB24:
612  case FRAME_U_RGB24:
613  if (frametype == FRAME_ARITH_RGB24 || frametype == FRAME_U_RGB24)
614  avctx->pix_fmt = AV_PIX_FMT_GBRP;
615 
616  if ((ret = ff_thread_get_buffer(avctx, &frame, 0)) < 0)
617  return ret;
618 
619  offs[0] = offset_bv;
620  offs[1] = offset_gu;
621  offs[2] = offset_ry;
622 
623  for (i = 0; i < planes; i++)
624  srcs[i] = p->data[i] + (avctx->height - 1) * p->linesize[i];
625  for (i = 0; i < planes; i++)
626  if (buf_size <= offs[i]) {
627  av_log(avctx, AV_LOG_ERROR,
628  "Invalid frame offsets\n");
629  return AVERROR_INVALIDDATA;
630  }
631 
632  for (i = 0; i < planes; i++)
633  lag_decode_arith_plane(l, srcs[i],
634  avctx->width, avctx->height,
635  -p->linesize[i], buf + offs[i],
636  buf_size - offs[i]);
637  for (i = 0; i < avctx->height; i++) {
638  l->llviddsp.add_bytes(p->data[0] + i * p->linesize[0], p->data[1] + i * p->linesize[1], avctx->width);
639  l->llviddsp.add_bytes(p->data[2] + i * p->linesize[2], p->data[1] + i * p->linesize[1], avctx->width);
640  }
641  FFSWAP(uint8_t*, p->data[0], p->data[1]);
642  FFSWAP(int, p->linesize[0], p->linesize[1]);
643  FFSWAP(uint8_t*, p->data[2], p->data[1]);
644  FFSWAP(int, p->linesize[2], p->linesize[1]);
645  break;
646  case FRAME_ARITH_YUY2:
647  avctx->pix_fmt = AV_PIX_FMT_YUV422P;
648 
649  if ((ret = ff_thread_get_buffer(avctx, &frame, 0)) < 0)
650  return ret;
651 
652  if (offset_ry >= buf_size ||
653  offset_gu >= buf_size ||
654  offset_bv >= buf_size) {
655  av_log(avctx, AV_LOG_ERROR,
656  "Invalid frame offsets\n");
657  return AVERROR_INVALIDDATA;
658  }
659 
660  lag_decode_arith_plane(l, p->data[0], avctx->width, avctx->height,
661  p->linesize[0], buf + offset_ry,
662  buf_size - offset_ry);
663  lag_decode_arith_plane(l, p->data[1], (avctx->width + 1) / 2,
664  avctx->height, p->linesize[1],
665  buf + offset_gu, buf_size - offset_gu);
666  lag_decode_arith_plane(l, p->data[2], (avctx->width + 1) / 2,
667  avctx->height, p->linesize[2],
668  buf + offset_bv, buf_size - offset_bv);
669  break;
670  case FRAME_ARITH_YV12:
671  avctx->pix_fmt = AV_PIX_FMT_YUV420P;
672 
673  if ((ret = ff_thread_get_buffer(avctx, &frame, 0)) < 0)
674  return ret;
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 
716  .name = "lagarith",
717  .long_name = NULL_IF_CONFIG_SMALL("Lagarith lossless"),
718  .type = AVMEDIA_TYPE_VIDEO,
719  .id = AV_CODEC_ID_LAGARITH,
720  .priv_data_size = sizeof(LagarithContext),
724 };
static unsigned int show_bits_long(GetBitContext *s, int n)
Show 0-32 bits.
Definition: get_bits.h:602
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
#define AVERROR_INVALIDDATA
Invalid data found when processing input.
Definition: error.h:59
int(* add_left_pred)(uint8_t *dst, const uint8_t *src, ptrdiff_t w, int left)
static int shift(int a, int b)
Definition: sonic.c:82
This structure describes decoded (raw) audio or video data.
Definition: frame.h:300
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 av_cold int init(AVCodecContext *avctx)
Definition: avrndec.c:35
#define avpriv_request_sample(...)
planar GBR 4:4:4 24bpp
Definition: pixfmt.h:168
int size
Definition: packet.h:356
enum AVPixelFormat pix_fmt
Pixel format, see AV_PIX_FMT_xxx.
Definition: avcodec.h:736
int stride
Definition: mace.c:144
AVCodec.
Definition: codec.h:190
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:428
static void decode(AVCodecContext *dec_ctx, AVPacket *pkt, AVFrame *frame, FILE *outfile)
Definition: decode_audio.c:71
int zeros
number of consecutive zero bytes encountered
Definition: lagarith.c:54
AVCodec ff_lagarith_decoder
Definition: lagarith.c:715
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:370
Lagarith range decoder.
uint8_t
#define av_cold
Definition: attributes.h:88
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:265
Multithreading support functions.
int zeros_rem
number of zero bytes remaining to output
Definition: lagarith.c:55
static AVFrame * frame
const char data[16]
Definition: mxf.c:91
#define height
unsigned scale
Number of bits of precision in range.
Definition: lagarithrac.h:43
uint8_t * data
Definition: packet.h:355
void(* add_median_pred)(uint8_t *dst, const uint8_t *top, const uint8_t *diff, ptrdiff_t w, int *left, int *left_top)
bitstream reader API header.
int bits_per_coded_sample
bits per sample/pixel from the demuxer (needed for huffyuv).
Definition: avcodec.h:1750
#define av_log(a,...)
#define prob(name, subs,...)
Definition: cbs_vp9.c:373
#define U(x)
Definition: vp56_arith.h:37
#define src
Definition: vp8dsp.c:254
uncompressed
Definition: lagarith.c:38
LagarithFrameType
Definition: lagarith.c:37
arithmetic coded RGB24
Definition: lagarith.c:41
#define i(width, name, range_min, range_max)
Definition: cbs_h2645.c:269
#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:241
#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
const char * name
Name of the codec implementation.
Definition: codec.h:197
uint8_t bits
Definition: vp3data.h:202
static const uint8_t offset[127][2]
Definition: vf_spp.c:93
#define AV_CODEC_CAP_FRAME_THREADS
Codec supports frame-level multithreading.
Definition: codec.h:106
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
arithmetic coded YV12
Definition: lagarith.c:47
static const struct @315 planes[]
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:383
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:699
uint8_t w
Definition: llviddspenc.c:38
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:536
#define AV_RL32
Definition: intreadwrite.h:146
static int lag_decode_prob(GetBitContext *gb, uint32_t *value)
Definition: lagarith.c:101
#define L(x)
Definition: vp56_arith.h:36
#define av_log2
Definition: intmath.h:83
#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:328
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:331
static int init_get_bits8(GetBitContext *s, const uint8_t *buffer, int byte_size)
Initialize GetBitContext.
Definition: get_bits.h:677
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:526
int overread
Definition: lagarithrac.h:50
void ff_llviddsp_init(LLVidDSPContext *c)
static unsigned int get_bits1(GetBitContext *s)
Definition: get_bits.h:498
double value
Definition: eval.c:98
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:546
uint8_t * data[AV_NUM_DATA_POINTERS]
pointer to the picture/channel planes.
Definition: frame.h:314
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
#define bit(string, value)
Definition: cbs_mpeg2.c:58
solid non-grayscale color frame
Definition: lagarith.c:43
void * priv_data
Definition: avcodec.h:553
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)
static void lag_pred_line_yuy2(LagarithContext *l, uint8_t *buf, int width, int stride, int line, int is_luma)
Definition: lagarith.c:291
int key_frame
1 -> keyframe, 0-> not
Definition: frame.h:378
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
void(* add_bytes)(uint8_t *dst, uint8_t *src, ptrdiff_t w)
static double val(void *priv, double ch)
Definition: aeval.c:76
This structure stores compressed data.
Definition: packet.h:332
#define AV_CODEC_CAP_DR1
Codec uses get_buffer() for allocating buffers and supports custom allocators.
Definition: codec.h:50