FFmpeg  4.3.7
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  if (i > end - dst ||
412  i >= src_end - src)
413  return AVERROR_INVALIDDATA;
414  memcpy(dst, src, i);
415  dst += i;
416  l->zeros_rem = lag_calc_zero_run(src[i]);
417 
418  src += i + 1;
419  goto output_zeros;
420  } else {
421  memcpy(dst, src, i);
422  src += i;
423  dst += i;
424  }
425  }
426  return src - src_start;
427 }
428 
429 
430 
432  int width, int height, int stride,
433  const uint8_t *src, int src_size)
434 {
435  int i = 0;
436  int read = 0;
437  uint32_t length;
438  uint32_t offset = 1;
439  int esc_count;
440  GetBitContext gb;
441  lag_rac rac;
442  const uint8_t *src_end = src + src_size;
443  int ret;
444 
445  rac.avctx = l->avctx;
446  l->zeros = 0;
447 
448  if(src_size < 2)
449  return AVERROR_INVALIDDATA;
450 
451  esc_count = src[0];
452  if (esc_count < 4) {
453  length = width * height;
454  if(src_size < 5)
455  return AVERROR_INVALIDDATA;
456  if (esc_count && AV_RL32(src + 1) < length) {
457  length = AV_RL32(src + 1);
458  offset += 4;
459  }
460 
461  if ((ret = init_get_bits8(&gb, src + offset, src_size - offset)) < 0)
462  return ret;
463 
464  if (lag_read_prob_header(&rac, &gb) < 0)
465  return -1;
466 
467  ff_lag_rac_init(&rac, &gb, length - stride);
468  for (i = 0; i < height; i++) {
469  if (rac.overread > MAX_OVERREAD)
470  return AVERROR_INVALIDDATA;
471  read += lag_decode_line(l, &rac, dst + (i * stride), width,
472  stride, esc_count);
473  }
474 
475  if (read > length)
477  "Output more bytes than length (%d of %"PRIu32")\n", read,
478  length);
479  } else if (esc_count < 8) {
480  esc_count -= 4;
481  src ++;
482  src_size --;
483  if (esc_count > 0) {
484  /* Zero run coding only, no range coding. */
485  for (i = 0; i < height; i++) {
486  int res = lag_decode_zero_run_line(l, dst + (i * stride), src,
487  src_end, width, esc_count);
488  if (res < 0)
489  return res;
490  src += res;
491  }
492  } else {
493  if (src_size < width * height)
494  return AVERROR_INVALIDDATA; // buffer not big enough
495  /* Plane is stored uncompressed */
496  for (i = 0; i < height; i++) {
497  memcpy(dst + (i * stride), src, width);
498  src += width;
499  }
500  }
501  } else if (esc_count == 0xff) {
502  /* Plane is a solid run of given value */
503  for (i = 0; i < height; i++)
504  memset(dst + i * stride, src[1], width);
505  /* Do not apply prediction.
506  Note: memset to 0 above, setting first value to src[1]
507  and applying prediction gives the same result. */
508  return 0;
509  } else {
511  "Invalid zero run escape code! (%#x)\n", esc_count);
512  return -1;
513  }
514 
515  if (l->avctx->pix_fmt != AV_PIX_FMT_YUV422P) {
516  for (i = 0; i < height; i++) {
517  lag_pred_line(l, dst, width, stride, i);
518  dst += stride;
519  }
520  } else {
521  for (i = 0; i < height; i++) {
522  lag_pred_line_yuy2(l, dst, width, stride, i,
523  width == l->avctx->width);
524  dst += stride;
525  }
526  }
527 
528  return 0;
529 }
530 
531 /**
532  * Decode a frame.
533  * @param avctx codec context
534  * @param data output AVFrame
535  * @param data_size size of output data or 0 if no picture is returned
536  * @param avpkt input packet
537  * @return number of consumed bytes on success or negative if decode fails
538  */
540  void *data, int *got_frame, AVPacket *avpkt)
541 {
542  const uint8_t *buf = avpkt->data;
543  unsigned int buf_size = avpkt->size;
544  LagarithContext *l = avctx->priv_data;
545  ThreadFrame frame = { .f = data };
546  AVFrame *const p = data;
547  uint8_t frametype;
548  uint32_t offset_gu = 0, offset_bv = 0, offset_ry = 9;
549  uint32_t offs[4];
550  uint8_t *srcs[4];
551  int i, j, planes = 3;
552  int ret;
553 
554  p->key_frame = 1;
556 
557  frametype = buf[0];
558 
559  offset_gu = AV_RL32(buf + 1);
560  offset_bv = AV_RL32(buf + 5);
561 
562  switch (frametype) {
563  case FRAME_SOLID_RGBA:
564  avctx->pix_fmt = AV_PIX_FMT_GBRAP;
565  case FRAME_SOLID_GRAY:
566  if (frametype == FRAME_SOLID_GRAY)
567  if (avctx->bits_per_coded_sample == 24) {
568  avctx->pix_fmt = AV_PIX_FMT_GBRP;
569  } else {
570  avctx->pix_fmt = AV_PIX_FMT_GBRAP;
571  planes = 4;
572  }
573 
574  if ((ret = ff_thread_get_buffer(avctx, &frame, 0)) < 0)
575  return ret;
576 
577  if (frametype == FRAME_SOLID_RGBA) {
578  for (i = 0; i < avctx->height; i++) {
579  memset(p->data[0] + i * p->linesize[0], buf[2], avctx->width);
580  memset(p->data[1] + i * p->linesize[1], buf[1], avctx->width);
581  memset(p->data[2] + i * p->linesize[2], buf[3], avctx->width);
582  memset(p->data[3] + i * p->linesize[3], buf[4], avctx->width);
583  }
584  } else {
585  for (i = 0; i < avctx->height; i++) {
586  for (j = 0; j < planes; j++)
587  memset(p->data[j] + i * p->linesize[j], buf[1], avctx->width);
588  }
589  }
590  break;
591  case FRAME_SOLID_COLOR:
592  if (avctx->bits_per_coded_sample == 24) {
593  avctx->pix_fmt = AV_PIX_FMT_GBRP;
594  } else {
595  avctx->pix_fmt = AV_PIX_FMT_GBRAP;
596  }
597 
598  if ((ret = ff_thread_get_buffer(avctx, &frame,0)) < 0)
599  return ret;
600 
601  for (i = 0; i < avctx->height; i++) {
602  memset(p->data[0] + i * p->linesize[0], buf[2], avctx->width);
603  memset(p->data[1] + i * p->linesize[1], buf[1], avctx->width);
604  memset(p->data[2] + i * p->linesize[2], buf[3], avctx->width);
605  if (avctx->pix_fmt == AV_PIX_FMT_GBRAP)
606  memset(p->data[3] + i * p->linesize[3], 0xFFu, avctx->width);
607  }
608  break;
609  case FRAME_ARITH_RGBA:
610  avctx->pix_fmt = AV_PIX_FMT_GBRAP;
611  planes = 4;
612  offset_ry += 4;
613  offs[3] = AV_RL32(buf + 9);
614  case FRAME_ARITH_RGB24:
615  case FRAME_U_RGB24:
616  if (frametype == FRAME_ARITH_RGB24 || frametype == FRAME_U_RGB24)
617  avctx->pix_fmt = AV_PIX_FMT_GBRP;
618 
619  if ((ret = ff_thread_get_buffer(avctx, &frame, 0)) < 0)
620  return ret;
621 
622  offs[0] = offset_bv;
623  offs[1] = offset_gu;
624  offs[2] = offset_ry;
625 
626  for (i = 0; i < planes; i++)
627  srcs[i] = p->data[i] + (avctx->height - 1) * p->linesize[i];
628  for (i = 0; i < planes; i++)
629  if (buf_size <= offs[i]) {
630  av_log(avctx, AV_LOG_ERROR,
631  "Invalid frame offsets\n");
632  return AVERROR_INVALIDDATA;
633  }
634 
635  for (i = 0; i < planes; i++)
636  lag_decode_arith_plane(l, srcs[i],
637  avctx->width, avctx->height,
638  -p->linesize[i], buf + offs[i],
639  buf_size - offs[i]);
640  for (i = 0; i < avctx->height; i++) {
641  l->llviddsp.add_bytes(p->data[0] + i * p->linesize[0], p->data[1] + i * p->linesize[1], avctx->width);
642  l->llviddsp.add_bytes(p->data[2] + i * p->linesize[2], p->data[1] + i * p->linesize[1], avctx->width);
643  }
644  FFSWAP(uint8_t*, p->data[0], p->data[1]);
645  FFSWAP(int, p->linesize[0], p->linesize[1]);
646  FFSWAP(uint8_t*, p->data[2], p->data[1]);
647  FFSWAP(int, p->linesize[2], p->linesize[1]);
648  break;
649  case FRAME_ARITH_YUY2:
650  avctx->pix_fmt = AV_PIX_FMT_YUV422P;
651 
652  if ((ret = ff_thread_get_buffer(avctx, &frame, 0)) < 0)
653  return ret;
654 
655  if (offset_ry >= buf_size ||
656  offset_gu >= buf_size ||
657  offset_bv >= buf_size) {
658  av_log(avctx, AV_LOG_ERROR,
659  "Invalid frame offsets\n");
660  return AVERROR_INVALIDDATA;
661  }
662 
663  lag_decode_arith_plane(l, p->data[0], avctx->width, avctx->height,
664  p->linesize[0], buf + offset_ry,
665  buf_size - offset_ry);
666  lag_decode_arith_plane(l, p->data[1], (avctx->width + 1) / 2,
667  avctx->height, p->linesize[1],
668  buf + offset_gu, buf_size - offset_gu);
669  lag_decode_arith_plane(l, p->data[2], (avctx->width + 1) / 2,
670  avctx->height, p->linesize[2],
671  buf + offset_bv, buf_size - offset_bv);
672  break;
673  case FRAME_ARITH_YV12:
674  avctx->pix_fmt = AV_PIX_FMT_YUV420P;
675 
676  if ((ret = ff_thread_get_buffer(avctx, &frame, 0)) < 0)
677  return ret;
678 
679  if (offset_ry >= buf_size ||
680  offset_gu >= buf_size ||
681  offset_bv >= buf_size) {
682  av_log(avctx, AV_LOG_ERROR,
683  "Invalid frame offsets\n");
684  return AVERROR_INVALIDDATA;
685  }
686 
687  lag_decode_arith_plane(l, p->data[0], avctx->width, avctx->height,
688  p->linesize[0], buf + offset_ry,
689  buf_size - offset_ry);
690  lag_decode_arith_plane(l, p->data[2], (avctx->width + 1) / 2,
691  (avctx->height + 1) / 2, p->linesize[2],
692  buf + offset_gu, buf_size - offset_gu);
693  lag_decode_arith_plane(l, p->data[1], (avctx->width + 1) / 2,
694  (avctx->height + 1) / 2, p->linesize[1],
695  buf + offset_bv, buf_size - offset_bv);
696  break;
697  default:
698  av_log(avctx, AV_LOG_ERROR,
699  "Unsupported Lagarith frame type: %#"PRIx8"\n", frametype);
700  return AVERROR_PATCHWELCOME;
701  }
702 
703  *got_frame = 1;
704 
705  return buf_size;
706 }
707 
709 {
710  LagarithContext *l = avctx->priv_data;
711  l->avctx = avctx;
712 
714 
715  return 0;
716 }
717 
719  .name = "lagarith",
720  .long_name = NULL_IF_CONFIG_SMALL("Lagarith lossless"),
721  .type = AVMEDIA_TYPE_VIDEO,
722  .id = AV_CODEC_ID_LAGARITH,
723  .priv_data_size = sizeof(LagarithContext),
727 };
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:431
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:718
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:92
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:188
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:708
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:539
#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