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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 */
60 
61 /**
62  * Compute the 52-bit mantissa of 1/(double)denom.
63  * This crazy format uses floats in an entropy coder and we have to match x86
64  * rounding exactly, thus ordinary floats aren't portable enough.
65  * @param denom denominator
66  * @return 52-bit mantissa
67  * @see softfloat_mul
68  */
69 static uint64_t softfloat_reciprocal(uint32_t denom)
70 {
71  int shift = av_log2(denom - 1) + 1;
72  uint64_t ret = (1ULL << 52) / denom;
73  uint64_t err = (1ULL << 52) - ret * denom;
74  ret <<= shift;
75  err <<= shift;
76  err += denom / 2;
77  return ret + err / denom;
78 }
79 
80 /**
81  * (uint32_t)(x*f), where f has the given mantissa, and exponent 0
82  * Used in combination with softfloat_reciprocal computes x/(double)denom.
83  * @param x 32-bit integer factor
84  * @param mantissa mantissa of f with exponent 0
85  * @return 32-bit integer value (x*f)
86  * @see softfloat_reciprocal
87  */
88 static uint32_t softfloat_mul(uint32_t x, uint64_t mantissa)
89 {
90  uint64_t l = x * (mantissa & 0xffffffff);
91  uint64_t h = x * (mantissa >> 32);
92  h += l >> 32;
93  l &= 0xffffffff;
94  l += 1LL << av_log2(h >> 21);
95  h += l >> 32;
96  return h >> 20;
97 }
98 
99 static uint8_t lag_calc_zero_run(int8_t x)
100 {
101  return (x * 2) ^ (x >> 7);
102 }
103 
104 static int lag_decode_prob(GetBitContext *gb, uint32_t *value)
105 {
106  static const uint8_t series[] = { 1, 2, 3, 5, 8, 13, 21 };
107  int i;
108  int bit = 0;
109  int bits = 0;
110  int prevbit = 0;
111  unsigned val;
112 
113  for (i = 0; i < 7; i++) {
114  if (prevbit && bit)
115  break;
116  prevbit = bit;
117  bit = get_bits1(gb);
118  if (bit && !prevbit)
119  bits += series[i];
120  }
121  bits--;
122  if (bits < 0 || bits > 31) {
123  *value = 0;
124  return -1;
125  } else if (bits == 0) {
126  *value = 0;
127  return 0;
128  }
129 
130  val = get_bits_long(gb, bits);
131  val |= 1U << bits;
132 
133  *value = val - 1;
134 
135  return 0;
136 }
137 
139 {
140  int i, j, scale_factor;
141  unsigned prob, cumulative_target;
142  unsigned cumul_prob = 0;
143  unsigned scaled_cumul_prob = 0;
144  int nnz = 0;
145 
146  rac->prob[0] = 0;
147  rac->prob[257] = UINT_MAX;
148  /* Read probabilities from bitstream */
149  for (i = 1; i < 257; i++) {
150  if (lag_decode_prob(gb, &rac->prob[i]) < 0) {
151  av_log(rac->avctx, AV_LOG_ERROR, "Invalid probability encountered.\n");
152  return -1;
153  }
154  if ((uint64_t)cumul_prob + rac->prob[i] > UINT_MAX) {
155  av_log(rac->avctx, AV_LOG_ERROR, "Integer overflow encountered in cumulative probability calculation.\n");
156  return -1;
157  }
158  cumul_prob += rac->prob[i];
159  if (!rac->prob[i]) {
160  if (lag_decode_prob(gb, &prob)) {
161  av_log(rac->avctx, AV_LOG_ERROR, "Invalid probability run encountered.\n");
162  return -1;
163  }
164  if (prob > 256 - i)
165  prob = 256 - i;
166  for (j = 0; j < prob; j++)
167  rac->prob[++i] = 0;
168  }else {
169  nnz++;
170  }
171  }
172 
173  if (!cumul_prob) {
174  av_log(rac->avctx, AV_LOG_ERROR, "All probabilities are 0!\n");
175  return -1;
176  }
177 
178  if (nnz == 1 && (show_bits_long(gb, 32) & 0xFFFFFF)) {
179  return AVERROR_INVALIDDATA;
180  }
181 
182  /* Scale probabilities so cumulative probability is an even power of 2. */
183  scale_factor = av_log2(cumul_prob);
184 
185  if (cumul_prob & (cumul_prob - 1)) {
186  uint64_t mul = softfloat_reciprocal(cumul_prob);
187  for (i = 1; i <= 128; i++) {
188  rac->prob[i] = softfloat_mul(rac->prob[i], mul);
189  scaled_cumul_prob += rac->prob[i];
190  }
191  if (scaled_cumul_prob <= 0) {
192  av_log(rac->avctx, AV_LOG_ERROR, "Scaled probabilities invalid\n");
193  return AVERROR_INVALIDDATA;
194  }
195  for (; i < 257; i++) {
196  rac->prob[i] = softfloat_mul(rac->prob[i], mul);
197  scaled_cumul_prob += rac->prob[i];
198  }
199 
200  scale_factor++;
201  if (scale_factor >= 32U)
202  return AVERROR_INVALIDDATA;
203  cumulative_target = 1U << scale_factor;
204 
205  if (scaled_cumul_prob > cumulative_target) {
206  av_log(rac->avctx, AV_LOG_ERROR,
207  "Scaled probabilities are larger than target!\n");
208  return -1;
209  }
210 
211  scaled_cumul_prob = cumulative_target - scaled_cumul_prob;
212 
213  for (i = 1; scaled_cumul_prob; i = (i & 0x7f) + 1) {
214  if (rac->prob[i]) {
215  rac->prob[i]++;
216  scaled_cumul_prob--;
217  }
218  /* Comment from reference source:
219  * if (b & 0x80 == 0) { // order of operations is 'wrong'; it has been left this way
220  * // since the compression change is negligible and fixing it
221  * // breaks backwards compatibility
222  * b =- (signed int)b;
223  * b &= 0xFF;
224  * } else {
225  * b++;
226  * b &= 0x7f;
227  * }
228  */
229  }
230  }
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 
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], *dst;
548  int i, j, planes = 3;
549  int ret;
550 
551  p->key_frame = 1;
552 
553  frametype = buf[0];
554 
555  offset_gu = AV_RL32(buf + 1);
556  offset_bv = AV_RL32(buf + 5);
557 
558  switch (frametype) {
559  case FRAME_SOLID_RGBA:
560  avctx->pix_fmt = AV_PIX_FMT_RGB32;
561  case FRAME_SOLID_GRAY:
562  if (frametype == FRAME_SOLID_GRAY)
563  if (avctx->bits_per_coded_sample == 24) {
564  avctx->pix_fmt = AV_PIX_FMT_RGB24;
565  } else {
566  avctx->pix_fmt = AV_PIX_FMT_0RGB32;
567  planes = 4;
568  }
569 
570  if ((ret = ff_thread_get_buffer(avctx, &frame, 0)) < 0)
571  return ret;
572 
573  dst = p->data[0];
574  if (frametype == FRAME_SOLID_RGBA) {
575  for (j = 0; j < avctx->height; j++) {
576  for (i = 0; i < avctx->width; i++)
577  AV_WN32(dst + i * 4, offset_gu);
578  dst += p->linesize[0];
579  }
580  } else {
581  for (j = 0; j < avctx->height; j++) {
582  memset(dst, buf[1], avctx->width * planes);
583  dst += p->linesize[0];
584  }
585  }
586  break;
587  case FRAME_SOLID_COLOR:
588  if (avctx->bits_per_coded_sample == 24) {
589  avctx->pix_fmt = AV_PIX_FMT_RGB24;
590  } else {
591  avctx->pix_fmt = AV_PIX_FMT_RGB32;
592  offset_gu |= 0xFFU << 24;
593  }
594 
595  if ((ret = ff_thread_get_buffer(avctx, &frame,0)) < 0)
596  return ret;
597 
598  dst = p->data[0];
599  for (j = 0; j < avctx->height; j++) {
600  for (i = 0; i < avctx->width; i++)
601  if (avctx->bits_per_coded_sample == 24) {
602  AV_WB24(dst + i * 3, offset_gu);
603  } else {
604  AV_WN32(dst + i * 4, offset_gu);
605  }
606  dst += p->linesize[0];
607  }
608  break;
609  case FRAME_ARITH_RGBA:
610  avctx->pix_fmt = AV_PIX_FMT_RGB32;
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_RGB24;
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  l->rgb_stride = FFALIGN(avctx->width, 16);
628  l->rgb_stride * avctx->height * planes + 1);
629  if (!l->rgb_planes) {
630  av_log(avctx, AV_LOG_ERROR, "cannot allocate temporary buffer\n");
631  return AVERROR(ENOMEM);
632  }
633  for (i = 0; i < planes; i++)
634  srcs[i] = l->rgb_planes + (i + 1) * l->rgb_stride * avctx->height - l->rgb_stride;
635  for (i = 0; i < planes; i++)
636  if (buf_size <= offs[i]) {
637  av_log(avctx, AV_LOG_ERROR,
638  "Invalid frame offsets\n");
639  return AVERROR_INVALIDDATA;
640  }
641 
642  for (i = 0; i < planes; i++)
643  lag_decode_arith_plane(l, srcs[i],
644  avctx->width, avctx->height,
645  -l->rgb_stride, buf + offs[i],
646  buf_size - offs[i]);
647  dst = p->data[0];
648  for (i = 0; i < planes; i++)
649  srcs[i] = l->rgb_planes + i * l->rgb_stride * avctx->height;
650  for (j = 0; j < avctx->height; j++) {
651  for (i = 0; i < avctx->width; i++) {
652  uint8_t r, g, b, a;
653  r = srcs[0][i];
654  g = srcs[1][i];
655  b = srcs[2][i];
656  r += g;
657  b += g;
658  if (frametype == FRAME_ARITH_RGBA) {
659  a = srcs[3][i];
660  AV_WN32(dst + i * 4, MKBETAG(a, r, g, b));
661  } else {
662  dst[i * 3 + 0] = r;
663  dst[i * 3 + 1] = g;
664  dst[i * 3 + 2] = b;
665  }
666  }
667  dst += p->linesize[0];
668  for (i = 0; i < planes; i++)
669  srcs[i] += l->rgb_stride;
670  }
671  break;
672  case FRAME_ARITH_YUY2:
673  avctx->pix_fmt = AV_PIX_FMT_YUV422P;
674 
675  if ((ret = ff_thread_get_buffer(avctx, &frame, 0)) < 0)
676  return ret;
677 
678  if (offset_ry >= buf_size ||
679  offset_gu >= buf_size ||
680  offset_bv >= buf_size) {
681  av_log(avctx, AV_LOG_ERROR,
682  "Invalid frame offsets\n");
683  return AVERROR_INVALIDDATA;
684  }
685 
686  lag_decode_arith_plane(l, p->data[0], avctx->width, avctx->height,
687  p->linesize[0], buf + offset_ry,
688  buf_size - offset_ry);
689  lag_decode_arith_plane(l, p->data[1], (avctx->width + 1) / 2,
690  avctx->height, p->linesize[1],
691  buf + offset_gu, buf_size - offset_gu);
692  lag_decode_arith_plane(l, p->data[2], (avctx->width + 1) / 2,
693  avctx->height, p->linesize[2],
694  buf + offset_bv, buf_size - offset_bv);
695  break;
696  case FRAME_ARITH_YV12:
697  avctx->pix_fmt = AV_PIX_FMT_YUV420P;
698 
699  if ((ret = ff_thread_get_buffer(avctx, &frame, 0)) < 0)
700  return ret;
701  if (buf_size <= offset_ry || buf_size <= offset_gu || buf_size <= offset_bv) {
702  return AVERROR_INVALIDDATA;
703  }
704 
705  if (offset_ry >= buf_size ||
706  offset_gu >= buf_size ||
707  offset_bv >= buf_size) {
708  av_log(avctx, AV_LOG_ERROR,
709  "Invalid frame offsets\n");
710  return AVERROR_INVALIDDATA;
711  }
712 
713  lag_decode_arith_plane(l, p->data[0], avctx->width, avctx->height,
714  p->linesize[0], buf + offset_ry,
715  buf_size - offset_ry);
716  lag_decode_arith_plane(l, p->data[2], (avctx->width + 1) / 2,
717  (avctx->height + 1) / 2, p->linesize[2],
718  buf + offset_gu, buf_size - offset_gu);
719  lag_decode_arith_plane(l, p->data[1], (avctx->width + 1) / 2,
720  (avctx->height + 1) / 2, p->linesize[1],
721  buf + offset_bv, buf_size - offset_bv);
722  break;
723  default:
724  av_log(avctx, AV_LOG_ERROR,
725  "Unsupported Lagarith frame type: %#"PRIx8"\n", frametype);
726  return AVERROR_PATCHWELCOME;
727  }
728 
729  *got_frame = 1;
730 
731  return buf_size;
732 }
733 
735 {
736  LagarithContext *l = avctx->priv_data;
737  l->avctx = avctx;
738 
740 
741  return 0;
742 }
743 
744 #if HAVE_THREADS
745 static av_cold int lag_decode_init_thread_copy(AVCodecContext *avctx)
746 {
747  LagarithContext *l = avctx->priv_data;
748  l->avctx = avctx;
749 
750  return 0;
751 }
752 #endif
753 
755 {
756  LagarithContext *l = avctx->priv_data;
757 
758  av_freep(&l->rgb_planes);
759 
760  return 0;
761 }
762 
764  .name = "lagarith",
765  .long_name = NULL_IF_CONFIG_SMALL("Lagarith lossless"),
766  .type = AVMEDIA_TYPE_VIDEO,
767  .id = AV_CODEC_ID_LAGARITH,
768  .priv_data_size = sizeof(LagarithContext),
770  .init_thread_copy = ONLY_IF_THREADS_ENABLED(lag_decode_init_thread_copy),
771  .close = lag_decode_end,
772  .decode = lag_decode_frame,
774 };
static unsigned int show_bits_long(GetBitContext *s, int n)
Show 0-32 bits.
Definition: get_bits.h:405
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:218
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
packed RGB 8:8:8, 24bpp, RGBRGB...
Definition: pixfmt.h:68
const char * g
Definition: vf_curves.c:112
static av_cold int init(AVCodecContext *avctx)
Definition: avrndec.c:35
int size
Definition: avcodec.h:1434
const char * b
Definition: vf_curves.c:113
int av_log2(unsigned v)
Definition: intmath.c:26
enum AVPixelFormat pix_fmt
Pixel format, see AV_PIX_FMT_xxx.
Definition: avcodec.h:1730
#define src
Definition: vp8dsp.c:254
AVCodec.
Definition: avcodec.h:3411
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
int zeros
number of consecutive zero bytes encountered
Definition: lagarith.c:54
AVCodec ff_lagarith_decoder
Definition: lagarith.c:763
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:370
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:265
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:1433
static const struct @283 planes[]
bitstream reader API header.
int bits_per_coded_sample
bits per sample/pixel from the demuxer (needed for huffyuv).
Definition: avcodec.h:2737
#define FFALIGN(x, a)
Definition: macros.h:48
#define av_log(a,...)
#define prob(name, subs,...)
Definition: cbs_vp9.c:367
#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
#define AVERROR(e)
Definition: error.h:43
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
const char * r
Definition: vf_curves.c:111
AVCodecContext * avctx
Definition: lagarith.c:52
Definition: graph2dot.c:48
uint16_t width
Definition: gdv.c:47
GLsizei GLsizei * length
Definition: opengl_enc.c:115
const char * name
Name of the codec implementation.
Definition: avcodec.h:3418
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:1018
static av_cold int lag_decode_init(AVCodecContext *avctx)
Definition: lagarith.c:734
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
void av_fast_malloc(void *ptr, unsigned int *size, size_t min_size)
Allocate a buffer, reusing the given one if large enough.
Definition: mem.c:488
int rgb_planes_allocated
Definition: lagarith.c:57
static uint64_t softfloat_reciprocal(uint32_t denom)
Compute the 52-bit mantissa of 1/(double)denom.
Definition: lagarith.c:69
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
int width
picture width / height.
Definition: avcodec.h:1693
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:536
#define AV_WB24(p, d)
Definition: intreadwrite.h:450
static int lag_decode_prob(GetBitContext *gb, uint32_t *value)
Definition: lagarith.c:104
#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: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:249
static int init_get_bits8(GetBitContext *s, const uint8_t *buffer, int byte_size)
Initialize GetBitContext.
Definition: get_bits.h:464
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:88
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:1521
#define AV_PIX_FMT_RGB32
Definition: pixfmt.h:352
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:321
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:138
static unsigned int get_bits_long(GetBitContext *s, int n)
Read 0-32 bits.
Definition: get_bits.h:354
uint8_t * rgb_planes
Definition: lagarith.c:56
uint8_t * data[AV_NUM_DATA_POINTERS]
pointer to the picture/channel planes.
Definition: frame.h:232
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
static av_cold int lag_decode_end(AVCodecContext *avctx)
Definition: lagarith.c:754
#define AV_WN32(p, v)
Definition: intreadwrite.h:376
solid non-grayscale color frame
Definition: lagarith.c:43
#define MKBETAG(a, b, c, d)
Definition: common.h:367
void * priv_data
Definition: avcodec.h:1548
static uint8_t lag_calc_zero_run(int8_t x)
Definition: lagarith.c:99
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:291
int key_frame
1 -> keyframe, 0-> not
Definition: frame.h:296
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 av_freep(p)
#define stride
uint64_t_TMPL AV_WL64 unsigned int_TMPL AV_RL32
Definition: bytestream.h:87
This structure stores compressed data.
Definition: avcodec.h:1410
#define AV_CODEC_CAP_DR1
Codec uses get_buffer() for allocating buffers and supports custom allocators.
Definition: avcodec.h:962
for(j=16;j >0;--j)
void(* add_median_pred)(uint8_t *dst, const uint8_t *top, const uint8_t *diff, ptrdiff_t w, int *left, int *left_top)
#define AV_PIX_FMT_0RGB32
Definition: pixfmt.h:356