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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 
145  rac->prob[0] = 0;
146  rac->prob[257] = UINT_MAX;
147  /* Read probabilities from bitstream */
148  for (i = 1; i < 257; i++) {
149  if (lag_decode_prob(gb, &rac->prob[i]) < 0) {
150  av_log(rac->avctx, AV_LOG_ERROR, "Invalid probability encountered.\n");
151  return -1;
152  }
153  if ((uint64_t)cumul_prob + rac->prob[i] > UINT_MAX) {
154  av_log(rac->avctx, AV_LOG_ERROR, "Integer overflow encountered in cumulative probability calculation.\n");
155  return -1;
156  }
157  cumul_prob += rac->prob[i];
158  if (!rac->prob[i]) {
159  if (lag_decode_prob(gb, &prob)) {
160  av_log(rac->avctx, AV_LOG_ERROR, "Invalid probability run encountered.\n");
161  return -1;
162  }
163  if (prob > 256 - i)
164  prob = 256 - i;
165  for (j = 0; j < prob; j++)
166  rac->prob[++i] = 0;
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  /* Scale probabilities so cumulative probability is an even power of 2. */
176  scale_factor = av_log2(cumul_prob);
177 
178  if (cumul_prob & (cumul_prob - 1)) {
179  uint64_t mul = softfloat_reciprocal(cumul_prob);
180  for (i = 1; i <= 128; i++) {
181  rac->prob[i] = softfloat_mul(rac->prob[i], mul);
182  scaled_cumul_prob += rac->prob[i];
183  }
184  if (scaled_cumul_prob <= 0) {
185  av_log(rac->avctx, AV_LOG_ERROR, "Scaled probabilities invalid\n");
186  return AVERROR_INVALIDDATA;
187  }
188  for (; i < 257; i++) {
189  rac->prob[i] = softfloat_mul(rac->prob[i], mul);
190  scaled_cumul_prob += rac->prob[i];
191  }
192 
193  scale_factor++;
194  if (scale_factor >= 32U)
195  return AVERROR_INVALIDDATA;
196  cumulative_target = 1U << scale_factor;
197 
198  if (scaled_cumul_prob > cumulative_target) {
199  av_log(rac->avctx, AV_LOG_ERROR,
200  "Scaled probabilities are larger than target!\n");
201  return -1;
202  }
203 
204  scaled_cumul_prob = cumulative_target - scaled_cumul_prob;
205 
206  for (i = 1; scaled_cumul_prob; i = (i & 0x7f) + 1) {
207  if (rac->prob[i]) {
208  rac->prob[i]++;
209  scaled_cumul_prob--;
210  }
211  /* Comment from reference source:
212  * if (b & 0x80 == 0) { // order of operations is 'wrong'; it has been left this way
213  * // since the compression change is negligible and fixing it
214  * // breaks backwards compatibility
215  * b =- (signed int)b;
216  * b &= 0xFF;
217  * } else {
218  * b++;
219  * b &= 0x7f;
220  * }
221  */
222  }
223  }
224 
225  rac->scale = scale_factor;
226 
227  /* Fill probability array with cumulative probability for each symbol. */
228  for (i = 1; i < 257; i++)
229  rac->prob[i] += rac->prob[i - 1];
230 
231  return 0;
232 }
233 
235  uint8_t *diff, int w, int *left,
236  int *left_top)
237 {
238  /* This is almost identical to add_hfyu_median_pred in huffyuvdsp.h.
239  * However the &0xFF on the gradient predictor yields incorrect output
240  * for lagarith.
241  */
242  int i;
243  uint8_t l, lt;
244 
245  l = *left;
246  lt = *left_top;
247 
248  for (i = 0; i < w; i++) {
249  l = mid_pred(l, src1[i], l + src1[i] - lt) + diff[i];
250  lt = src1[i];
251  dst[i] = l;
252  }
253 
254  *left = l;
255  *left_top = lt;
256 }
257 
259  int width, int stride, int line)
260 {
261  int L, TL;
262 
263  if (!line) {
264  /* Left prediction only for first line */
265  L = l->llviddsp.add_left_pred(buf, buf, width, 0);
266  } else {
267  /* Left pixel is actually prev_row[width] */
268  L = buf[width - stride - 1];
269 
270  if (line == 1) {
271  /* Second line, left predict first pixel, the rest of the line is median predicted
272  * NOTE: In the case of RGB this pixel is top predicted */
273  TL = l->avctx->pix_fmt == AV_PIX_FMT_YUV420P ? buf[-stride] : L;
274  } else {
275  /* Top left is 2 rows back, last pixel */
276  TL = buf[width - (2 * stride) - 1];
277  }
278 
279  add_lag_median_prediction(buf, buf - stride, buf,
280  width, &L, &TL);
281  }
282 }
283 
285  int width, int stride, int line,
286  int is_luma)
287 {
288  int L, TL;
289 
290  if (!line) {
291  L= buf[0];
292  if (is_luma)
293  buf[0] = 0;
294  l->llviddsp.add_left_pred(buf, buf, width, 0);
295  if (is_luma)
296  buf[0] = L;
297  return;
298  }
299  if (line == 1) {
300  const int HEAD = is_luma ? 4 : 2;
301  int i;
302 
303  L = buf[width - stride - 1];
304  TL = buf[HEAD - stride - 1];
305  for (i = 0; i < HEAD; i++) {
306  L += buf[i];
307  buf[i] = L;
308  }
309  for (; i < width; i++) {
310  L = mid_pred(L & 0xFF, buf[i - stride], (L + buf[i - stride] - TL) & 0xFF) + buf[i];
311  TL = buf[i - stride];
312  buf[i] = L;
313  }
314  } else {
315  TL = buf[width - (2 * stride) - 1];
316  L = buf[width - stride - 1];
317  l->llviddsp.add_median_pred(buf, buf - stride, buf, width, &L, &TL);
318  }
319 }
320 
322  uint8_t *dst, int width, int stride,
323  int esc_count)
324 {
325  int i = 0;
326  int ret = 0;
327 
328  if (!esc_count)
329  esc_count = -1;
330 
331  /* Output any zeros remaining from the previous run */
332 handle_zeros:
333  if (l->zeros_rem) {
334  int count = FFMIN(l->zeros_rem, width - i);
335  memset(dst + i, 0, count);
336  i += count;
337  l->zeros_rem -= count;
338  }
339 
340  while (i < width) {
341  dst[i] = lag_get_rac(rac);
342  ret++;
343 
344  if (dst[i])
345  l->zeros = 0;
346  else
347  l->zeros++;
348 
349  i++;
350  if (l->zeros == esc_count) {
351  int index = lag_get_rac(rac);
352  ret++;
353 
354  l->zeros = 0;
355 
356  l->zeros_rem = lag_calc_zero_run(index);
357  goto handle_zeros;
358  }
359  }
360  return ret;
361 }
362 
364  const uint8_t *src, const uint8_t *src_end,
365  int width, int esc_count)
366 {
367  int i = 0;
368  int count;
369  uint8_t zero_run = 0;
370  const uint8_t *src_start = src;
371  uint8_t mask1 = -(esc_count < 2);
372  uint8_t mask2 = -(esc_count < 3);
373  uint8_t *end = dst + (width - 2);
374 
375  avpriv_request_sample(l->avctx, "zero_run_line");
376 
377  memset(dst, 0, width);
378 
379 output_zeros:
380  if (l->zeros_rem) {
381  count = FFMIN(l->zeros_rem, width - i);
382  if (end - dst < count) {
383  av_log(l->avctx, AV_LOG_ERROR, "Too many zeros remaining.\n");
384  return AVERROR_INVALIDDATA;
385  }
386 
387  memset(dst, 0, count);
388  l->zeros_rem -= count;
389  dst += count;
390  }
391 
392  while (dst < end) {
393  i = 0;
394  while (!zero_run && dst + i < end) {
395  i++;
396  if (i+2 >= src_end - src)
397  return AVERROR_INVALIDDATA;
398  zero_run =
399  !(src[i] | (src[i + 1] & mask1) | (src[i + 2] & mask2));
400  }
401  if (zero_run) {
402  zero_run = 0;
403  i += esc_count;
404  memcpy(dst, src, i);
405  dst += i;
406  l->zeros_rem = lag_calc_zero_run(src[i]);
407 
408  src += i + 1;
409  goto output_zeros;
410  } else {
411  memcpy(dst, src, i);
412  src += i;
413  dst += i;
414  }
415  }
416  return src - src_start;
417 }
418 
419 
420 
422  int width, int height, int stride,
423  const uint8_t *src, int src_size)
424 {
425  int i = 0;
426  int read = 0;
427  uint32_t length;
428  uint32_t offset = 1;
429  int esc_count;
430  GetBitContext gb;
431  lag_rac rac;
432  const uint8_t *src_end = src + src_size;
433  int ret;
434 
435  rac.avctx = l->avctx;
436  l->zeros = 0;
437 
438  if(src_size < 2)
439  return AVERROR_INVALIDDATA;
440 
441  esc_count = src[0];
442  if (esc_count < 4) {
443  length = width * height;
444  if(src_size < 5)
445  return AVERROR_INVALIDDATA;
446  if (esc_count && AV_RL32(src + 1) < length) {
447  length = AV_RL32(src + 1);
448  offset += 4;
449  }
450 
451  if ((ret = init_get_bits8(&gb, src + offset, src_size - offset)) < 0)
452  return ret;
453 
454  if (lag_read_prob_header(&rac, &gb) < 0)
455  return -1;
456 
457  ff_lag_rac_init(&rac, &gb, length - stride);
458  for (i = 0; i < height; i++) {
459  if (rac.overread > MAX_OVERREAD)
460  return AVERROR_INVALIDDATA;
461  read += lag_decode_line(l, &rac, dst + (i * stride), width,
462  stride, esc_count);
463  }
464 
465  if (read > length)
467  "Output more bytes than length (%d of %"PRIu32")\n", read,
468  length);
469  } else if (esc_count < 8) {
470  esc_count -= 4;
471  src ++;
472  src_size --;
473  if (esc_count > 0) {
474  /* Zero run coding only, no range coding. */
475  for (i = 0; i < height; i++) {
476  int res = lag_decode_zero_run_line(l, dst + (i * stride), src,
477  src_end, width, esc_count);
478  if (res < 0)
479  return res;
480  src += res;
481  }
482  } else {
483  if (src_size < width * height)
484  return AVERROR_INVALIDDATA; // buffer not big enough
485  /* Plane is stored uncompressed */
486  for (i = 0; i < height; i++) {
487  memcpy(dst + (i * stride), src, width);
488  src += width;
489  }
490  }
491  } else if (esc_count == 0xff) {
492  /* Plane is a solid run of given value */
493  for (i = 0; i < height; i++)
494  memset(dst + i * stride, src[1], width);
495  /* Do not apply prediction.
496  Note: memset to 0 above, setting first value to src[1]
497  and applying prediction gives the same result. */
498  return 0;
499  } else {
501  "Invalid zero run escape code! (%#x)\n", esc_count);
502  return -1;
503  }
504 
505  if (l->avctx->pix_fmt != AV_PIX_FMT_YUV422P) {
506  for (i = 0; i < height; i++) {
507  lag_pred_line(l, dst, width, stride, i);
508  dst += stride;
509  }
510  } else {
511  for (i = 0; i < height; i++) {
512  lag_pred_line_yuy2(l, dst, width, stride, i,
513  width == l->avctx->width);
514  dst += stride;
515  }
516  }
517 
518  return 0;
519 }
520 
521 /**
522  * Decode a frame.
523  * @param avctx codec context
524  * @param data output AVFrame
525  * @param data_size size of output data or 0 if no picture is returned
526  * @param avpkt input packet
527  * @return number of consumed bytes on success or negative if decode fails
528  */
530  void *data, int *got_frame, AVPacket *avpkt)
531 {
532  const uint8_t *buf = avpkt->data;
533  unsigned int buf_size = avpkt->size;
534  LagarithContext *l = avctx->priv_data;
535  ThreadFrame frame = { .f = data };
536  AVFrame *const p = data;
537  uint8_t frametype = 0;
538  uint32_t offset_gu = 0, offset_bv = 0, offset_ry = 9;
539  uint32_t offs[4];
540  uint8_t *srcs[4], *dst;
541  int i, j, planes = 3;
542  int ret;
543 
544  p->key_frame = 1;
545 
546  frametype = buf[0];
547 
548  offset_gu = AV_RL32(buf + 1);
549  offset_bv = AV_RL32(buf + 5);
550 
551  switch (frametype) {
552  case FRAME_SOLID_RGBA:
553  avctx->pix_fmt = AV_PIX_FMT_RGB32;
554  case FRAME_SOLID_GRAY:
555  if (frametype == FRAME_SOLID_GRAY)
556  if (avctx->bits_per_coded_sample == 24) {
557  avctx->pix_fmt = AV_PIX_FMT_RGB24;
558  } else {
559  avctx->pix_fmt = AV_PIX_FMT_0RGB32;
560  planes = 4;
561  }
562 
563  if ((ret = ff_thread_get_buffer(avctx, &frame, 0)) < 0)
564  return ret;
565 
566  dst = p->data[0];
567  if (frametype == FRAME_SOLID_RGBA) {
568  for (j = 0; j < avctx->height; j++) {
569  for (i = 0; i < avctx->width; i++)
570  AV_WN32(dst + i * 4, offset_gu);
571  dst += p->linesize[0];
572  }
573  } else {
574  for (j = 0; j < avctx->height; j++) {
575  memset(dst, buf[1], avctx->width * planes);
576  dst += p->linesize[0];
577  }
578  }
579  break;
580  case FRAME_SOLID_COLOR:
581  if (avctx->bits_per_coded_sample == 24) {
582  avctx->pix_fmt = AV_PIX_FMT_RGB24;
583  } else {
584  avctx->pix_fmt = AV_PIX_FMT_RGB32;
585  offset_gu |= 0xFFU << 24;
586  }
587 
588  if ((ret = ff_thread_get_buffer(avctx, &frame,0)) < 0)
589  return ret;
590 
591  dst = p->data[0];
592  for (j = 0; j < avctx->height; j++) {
593  for (i = 0; i < avctx->width; i++)
594  if (avctx->bits_per_coded_sample == 24) {
595  AV_WB24(dst + i * 3, offset_gu);
596  } else {
597  AV_WN32(dst + i * 4, offset_gu);
598  }
599  dst += p->linesize[0];
600  }
601  break;
602  case FRAME_ARITH_RGBA:
603  avctx->pix_fmt = AV_PIX_FMT_RGB32;
604  planes = 4;
605  offset_ry += 4;
606  offs[3] = AV_RL32(buf + 9);
607  case FRAME_ARITH_RGB24:
608  case FRAME_U_RGB24:
609  if (frametype == FRAME_ARITH_RGB24 || frametype == FRAME_U_RGB24)
610  avctx->pix_fmt = AV_PIX_FMT_RGB24;
611 
612  if ((ret = ff_thread_get_buffer(avctx, &frame, 0)) < 0)
613  return ret;
614 
615  offs[0] = offset_bv;
616  offs[1] = offset_gu;
617  offs[2] = offset_ry;
618 
619  l->rgb_stride = FFALIGN(avctx->width, 16);
621  l->rgb_stride * avctx->height * planes + 1);
622  if (!l->rgb_planes) {
623  av_log(avctx, AV_LOG_ERROR, "cannot allocate temporary buffer\n");
624  return AVERROR(ENOMEM);
625  }
626  for (i = 0; i < planes; i++)
627  srcs[i] = l->rgb_planes + (i + 1) * l->rgb_stride * avctx->height - l->rgb_stride;
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  -l->rgb_stride, buf + offs[i],
639  buf_size - offs[i]);
640  dst = p->data[0];
641  for (i = 0; i < planes; i++)
642  srcs[i] = l->rgb_planes + i * l->rgb_stride * avctx->height;
643  for (j = 0; j < avctx->height; j++) {
644  for (i = 0; i < avctx->width; i++) {
645  uint8_t r, g, b, a;
646  r = srcs[0][i];
647  g = srcs[1][i];
648  b = srcs[2][i];
649  r += g;
650  b += g;
651  if (frametype == FRAME_ARITH_RGBA) {
652  a = srcs[3][i];
653  AV_WN32(dst + i * 4, MKBETAG(a, r, g, b));
654  } else {
655  dst[i * 3 + 0] = r;
656  dst[i * 3 + 1] = g;
657  dst[i * 3 + 2] = b;
658  }
659  }
660  dst += p->linesize[0];
661  for (i = 0; i < planes; i++)
662  srcs[i] += l->rgb_stride;
663  }
664  break;
665  case FRAME_ARITH_YUY2:
666  avctx->pix_fmt = AV_PIX_FMT_YUV422P;
667 
668  if ((ret = ff_thread_get_buffer(avctx, &frame, 0)) < 0)
669  return ret;
670 
671  if (offset_ry >= buf_size ||
672  offset_gu >= buf_size ||
673  offset_bv >= buf_size) {
674  av_log(avctx, AV_LOG_ERROR,
675  "Invalid frame offsets\n");
676  return AVERROR_INVALIDDATA;
677  }
678 
679  lag_decode_arith_plane(l, p->data[0], avctx->width, avctx->height,
680  p->linesize[0], buf + offset_ry,
681  buf_size - offset_ry);
682  lag_decode_arith_plane(l, p->data[1], (avctx->width + 1) / 2,
683  avctx->height, p->linesize[1],
684  buf + offset_gu, buf_size - offset_gu);
685  lag_decode_arith_plane(l, p->data[2], (avctx->width + 1) / 2,
686  avctx->height, p->linesize[2],
687  buf + offset_bv, buf_size - offset_bv);
688  break;
689  case FRAME_ARITH_YV12:
690  avctx->pix_fmt = AV_PIX_FMT_YUV420P;
691 
692  if ((ret = ff_thread_get_buffer(avctx, &frame, 0)) < 0)
693  return ret;
694  if (buf_size <= offset_ry || buf_size <= offset_gu || buf_size <= offset_bv) {
695  return AVERROR_INVALIDDATA;
696  }
697 
698  if (offset_ry >= buf_size ||
699  offset_gu >= buf_size ||
700  offset_bv >= buf_size) {
701  av_log(avctx, AV_LOG_ERROR,
702  "Invalid frame offsets\n");
703  return AVERROR_INVALIDDATA;
704  }
705 
706  lag_decode_arith_plane(l, p->data[0], avctx->width, avctx->height,
707  p->linesize[0], buf + offset_ry,
708  buf_size - offset_ry);
709  lag_decode_arith_plane(l, p->data[2], (avctx->width + 1) / 2,
710  (avctx->height + 1) / 2, p->linesize[2],
711  buf + offset_gu, buf_size - offset_gu);
712  lag_decode_arith_plane(l, p->data[1], (avctx->width + 1) / 2,
713  (avctx->height + 1) / 2, p->linesize[1],
714  buf + offset_bv, buf_size - offset_bv);
715  break;
716  default:
717  av_log(avctx, AV_LOG_ERROR,
718  "Unsupported Lagarith frame type: %#"PRIx8"\n", frametype);
719  return AVERROR_PATCHWELCOME;
720  }
721 
722  *got_frame = 1;
723 
724  return buf_size;
725 }
726 
728 {
729  LagarithContext *l = avctx->priv_data;
730  l->avctx = avctx;
731 
733 
734  return 0;
735 }
736 
737 #if HAVE_THREADS
738 static av_cold int lag_decode_init_thread_copy(AVCodecContext *avctx)
739 {
740  LagarithContext *l = avctx->priv_data;
741  l->avctx = avctx;
742 
743  return 0;
744 }
745 #endif
746 
748 {
749  LagarithContext *l = avctx->priv_data;
750 
751  av_freep(&l->rgb_planes);
752 
753  return 0;
754 }
755 
757  .name = "lagarith",
758  .long_name = NULL_IF_CONFIG_SMALL("Lagarith lossless"),
759  .type = AVMEDIA_TYPE_VIDEO,
760  .id = AV_CODEC_ID_LAGARITH,
761  .priv_data_size = sizeof(LagarithContext),
763  .init_thread_copy = ONLY_IF_THREADS_ENABLED(lag_decode_init_thread_copy),
764  .close = lag_decode_end,
765  .decode = lag_decode_frame,
767 };
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:201
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:64
const char * g
Definition: vf_curves.c:112
static av_cold int init(AVCodecContext *avctx)
Definition: avrndec.c:35
int size
Definition: avcodec.h:1401
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:1697
#define src
Definition: vp8dsp.c:254
AVCodec.
Definition: avcodec.h:3351
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:421
int zeros
number of consecutive zero bytes encountered
Definition: lagarith.c:54
AVCodec ff_lagarith_decoder
Definition: lagarith.c:756
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:363
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:258
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:1400
bitstream reader API header.
int bits_per_coded_sample
bits per sample/pixel from the demuxer (needed for huffyuv).
Definition: avcodec.h:2704
#define FFALIGN(x, a)
Definition: macros.h:48
#define av_log(a,...)
#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:234
#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:3358
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:1012
static av_cold int lag_decode_init(AVCodecContext *avctx)
Definition: lagarith.c:727
planar YUV 4:2:2, 16bpp, (1 Cr & Cb sample per 2x1 Y samples)
Definition: pixfmt.h:66
#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:483
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:1660
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:529
#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:321
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:232
static int init_get_bits8(GetBitContext *s, const uint8_t *buffer, int byte_size)
Initialize GetBitContext.
Definition: get_bits.h:456
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:1488
#define AV_PIX_FMT_RGB32
Definition: pixfmt.h:342
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:313
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:346
uint8_t * rgb_planes
Definition: lagarith.c:56
uint8_t * data[AV_NUM_DATA_POINTERS]
pointer to the picture/channel planes.
Definition: frame.h:215
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:62
static av_cold int lag_decode_end(AVCodecContext *avctx)
Definition: lagarith.c:747
#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:1515
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:284
int key_frame
1 -> keyframe, 0-> not
Definition: frame.h:279
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:1377
#define AV_CODEC_CAP_DR1
Codec uses get_buffer() for allocating buffers and supports custom allocators.
Definition: avcodec.h:956
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:346