Libav
huffyuvdec.c
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1 /*
2  * huffyuv decoder
3  *
4  * Copyright (c) 2002-2003 Michael Niedermayer <michaelni@gmx.at>
5  *
6  * see http://www.pcisys.net/~melanson/codecs/huffyuv.txt for a description of
7  * the algorithm used
8  *
9  * This file is part of Libav.
10  *
11  * Libav is free software; you can redistribute it and/or
12  * modify it under the terms of the GNU Lesser General Public
13  * License as published by the Free Software Foundation; either
14  * version 2.1 of the License, or (at your option) any later version.
15  *
16  * Libav is distributed in the hope that it will be useful,
17  * but WITHOUT ANY WARRANTY; without even the implied warranty of
18  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
19  * Lesser General Public License for more details.
20  *
21  * You should have received a copy of the GNU Lesser General Public
22  * License along with Libav; if not, write to the Free Software
23  * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
24  */
25 
31 #include "avcodec.h"
32 #include "get_bits.h"
33 #include "huffyuv.h"
34 #include "thread.h"
35 
36 #define classic_shift_luma_table_size 42
38  34,36,35,69,135,232,9,16,10,24,11,23,12,16,13,10,14,8,15,8,
39  16,8,17,20,16,10,207,206,205,236,11,8,10,21,9,23,8,8,199,70,
40  69,68, 0
41 };
42 
43 #define classic_shift_chroma_table_size 59
45  66,36,37,38,39,40,41,75,76,77,110,239,144,81,82,83,84,85,118,183,
46  56,57,88,89,56,89,154,57,58,57,26,141,57,56,58,57,58,57,184,119,
47  214,245,116,83,82,49,80,79,78,77,44,75,41,40,39,38,37,36,34, 0
48 };
49 
50 static const unsigned char classic_add_luma[256] = {
51  3, 9, 5, 12, 10, 35, 32, 29, 27, 50, 48, 45, 44, 41, 39, 37,
52  73, 70, 68, 65, 64, 61, 58, 56, 53, 50, 49, 46, 44, 41, 38, 36,
53  68, 65, 63, 61, 58, 55, 53, 51, 48, 46, 45, 43, 41, 39, 38, 36,
54  35, 33, 32, 30, 29, 27, 26, 25, 48, 47, 46, 44, 43, 41, 40, 39,
55  37, 36, 35, 34, 32, 31, 30, 28, 27, 26, 24, 23, 22, 20, 19, 37,
56  35, 34, 33, 31, 30, 29, 27, 26, 24, 23, 21, 20, 18, 17, 15, 29,
57  27, 26, 24, 22, 21, 19, 17, 16, 14, 26, 25, 23, 21, 19, 18, 16,
58  15, 27, 25, 23, 21, 19, 17, 16, 14, 26, 25, 23, 21, 18, 17, 14,
59  12, 17, 19, 13, 4, 9, 2, 11, 1, 7, 8, 0, 16, 3, 14, 6,
60  12, 10, 5, 15, 18, 11, 10, 13, 15, 16, 19, 20, 22, 24, 27, 15,
61  18, 20, 22, 24, 26, 14, 17, 20, 22, 24, 27, 15, 18, 20, 23, 25,
62  28, 16, 19, 22, 25, 28, 32, 36, 21, 25, 29, 33, 38, 42, 45, 49,
63  28, 31, 34, 37, 40, 42, 44, 47, 49, 50, 52, 54, 56, 57, 59, 60,
64  62, 64, 66, 67, 69, 35, 37, 39, 40, 42, 43, 45, 47, 48, 51, 52,
65  54, 55, 57, 59, 60, 62, 63, 66, 67, 69, 71, 72, 38, 40, 42, 43,
66  46, 47, 49, 51, 26, 28, 30, 31, 33, 34, 18, 19, 11, 13, 7, 8,
67 };
68 
69 static const unsigned char classic_add_chroma[256] = {
70  3, 1, 2, 2, 2, 2, 3, 3, 7, 5, 7, 5, 8, 6, 11, 9,
71  7, 13, 11, 10, 9, 8, 7, 5, 9, 7, 6, 4, 7, 5, 8, 7,
72  11, 8, 13, 11, 19, 15, 22, 23, 20, 33, 32, 28, 27, 29, 51, 77,
73  43, 45, 76, 81, 46, 82, 75, 55, 56,144, 58, 80, 60, 74,147, 63,
74  143, 65, 66, 67, 68, 69, 70, 71, 72, 73, 74, 75, 76, 77, 78, 79,
75  80, 81, 82, 83, 84, 85, 86, 87, 88, 89, 90, 91, 27, 30, 21, 22,
76  17, 14, 5, 6,100, 54, 47, 50, 51, 53,106,107,108,109,110,111,
77  112,113,114,115, 4,117,118, 92, 94,121,122, 3,124,103, 2, 1,
78  0,129,130,131,120,119,126,125,136,137,138,139,140,141,142,134,
79  135,132,133,104, 64,101, 62, 57,102, 95, 93, 59, 61, 28, 97, 96,
80  52, 49, 48, 29, 32, 25, 24, 46, 23, 98, 45, 44, 43, 20, 42, 41,
81  19, 18, 99, 40, 15, 39, 38, 16, 13, 12, 11, 37, 10, 9, 8, 36,
82  7,128,127,105,123,116, 35, 34, 33,145, 31, 79, 42,146, 78, 26,
83  83, 48, 49, 50, 44, 47, 26, 31, 30, 18, 17, 19, 21, 24, 25, 13,
84  14, 16, 17, 18, 20, 21, 12, 14, 15, 9, 10, 6, 9, 6, 5, 8,
85  6, 12, 8, 10, 7, 9, 6, 4, 6, 2, 2, 3, 3, 3, 3, 2,
86 };
87 
88 static int read_len_table(uint8_t *dst, GetBitContext *gb)
89 {
90  int i, val, repeat;
91 
92  for (i = 0; i < 256;) {
93  repeat = get_bits(gb, 3);
94  val = get_bits(gb, 5);
95  if (repeat == 0)
96  repeat = get_bits(gb, 8);
97  if (i + repeat > 256 || get_bits_left(gb) < 0) {
98  av_log(NULL, AV_LOG_ERROR, "Error reading huffman table\n");
99  return -1;
100  }
101  while (repeat--)
102  dst[i++] = val;
103  }
104  return 0;
105 }
106 
108 {
109  uint16_t symbols[1 << VLC_BITS];
110  uint16_t bits[1 << VLC_BITS];
111  uint8_t len[1 << VLC_BITS];
112  if (s->bitstream_bpp < 24) {
113  int p, i, y, u;
114  for (p = 0; p < 3; p++) {
115  for (i = y = 0; y < 256; y++) {
116  int len0 = s->len[0][y];
117  int limit = VLC_BITS - len0;
118  if(limit <= 0)
119  continue;
120  for (u = 0; u < 256; u++) {
121  int len1 = s->len[p][u];
122  if (len1 > limit)
123  continue;
124  len[i] = len0 + len1;
125  bits[i] = (s->bits[0][y] << len1) + s->bits[p][u];
126  symbols[i] = (y << 8) + u;
127  if(symbols[i] != 0xffff) // reserved to mean "invalid"
128  i++;
129  }
130  }
131  ff_free_vlc(&s->vlc[3 + p]);
132  ff_init_vlc_sparse(&s->vlc[3 + p], VLC_BITS, i, len, 1, 1,
133  bits, 2, 2, symbols, 2, 2, 0);
134  }
135  } else {
136  uint8_t (*map)[4] = (uint8_t(*)[4])s->pix_bgr_map;
137  int i, b, g, r, code;
138  int p0 = s->decorrelate;
139  int p1 = !s->decorrelate;
140  // restrict the range to +/-16 because that's pretty much guaranteed to
141  // cover all the combinations that fit in 11 bits total, and it doesn't
142  // matter if we miss a few rare codes.
143  for (i = 0, g = -16; g < 16; g++) {
144  int len0 = s->len[p0][g & 255];
145  int limit0 = VLC_BITS - len0;
146  if (limit0 < 2)
147  continue;
148  for (b = -16; b < 16; b++) {
149  int len1 = s->len[p1][b & 255];
150  int limit1 = limit0 - len1;
151  if (limit1 < 1)
152  continue;
153  code = (s->bits[p0][g & 255] << len1) + s->bits[p1][b & 255];
154  for (r = -16; r < 16; r++) {
155  int len2 = s->len[2][r & 255];
156  if (len2 > limit1)
157  continue;
158  len[i] = len0 + len1 + len2;
159  bits[i] = (code << len2) + s->bits[2][r & 255];
160  if (s->decorrelate) {
161  map[i][G] = g;
162  map[i][B] = g + b;
163  map[i][R] = g + r;
164  } else {
165  map[i][B] = g;
166  map[i][G] = b;
167  map[i][R] = r;
168  }
169  i++;
170  }
171  }
172  }
173  ff_free_vlc(&s->vlc[3]);
174  init_vlc(&s->vlc[3], VLC_BITS, i, len, 1, 1, bits, 2, 2, 0);
175  }
176 }
177 
178 static int read_huffman_tables(HYuvContext *s, const uint8_t *src, int length)
179 {
180  GetBitContext gb;
181  int i;
182 
183  init_get_bits(&gb, src, length * 8);
184 
185  for (i = 0; i < 3; i++) {
186  if (read_len_table(s->len[i], &gb) < 0)
187  return -1;
188  if (ff_huffyuv_generate_bits_table(s->bits[i], s->len[i]) < 0) {
189  return -1;
190  }
191  ff_free_vlc(&s->vlc[i]);
192  init_vlc(&s->vlc[i], VLC_BITS, 256, s->len[i], 1, 1,
193  s->bits[i], 4, 4, 0);
194  }
195 
197 
198  return (get_bits_count(&gb) + 7) / 8;
199 }
200 
202 {
203  GetBitContext gb;
204  int i;
205 
208  if (read_len_table(s->len[0], &gb) < 0)
209  return -1;
210 
213  if (read_len_table(s->len[1], &gb) < 0)
214  return -1;
215 
216  for(i=0; i<256; i++) s->bits[0][i] = classic_add_luma [i];
217  for(i=0; i<256; i++) s->bits[1][i] = classic_add_chroma[i];
218 
219  if (s->bitstream_bpp >= 24) {
220  memcpy(s->bits[1], s->bits[0], 256 * sizeof(uint32_t));
221  memcpy(s->len[1] , s->len [0], 256 * sizeof(uint8_t));
222  }
223  memcpy(s->bits[2], s->bits[1], 256 * sizeof(uint32_t));
224  memcpy(s->len[2] , s->len [1], 256 * sizeof(uint8_t));
225 
226  for (i = 0; i < 3; i++) {
227  ff_free_vlc(&s->vlc[i]);
228  init_vlc(&s->vlc[i], VLC_BITS, 256, s->len[i], 1, 1,
229  s->bits[i], 4, 4, 0);
230  }
231 
233 
234  return 0;
235 }
236 
238 {
239  HYuvContext *s = avctx->priv_data;
240 
241  ff_huffyuv_common_init(avctx);
242  memset(s->vlc, 0, 3 * sizeof(VLC));
243 
244  s->interlaced = s->height > 288;
245 
246  s->bgr32 = 1;
247 
248  if (avctx->extradata_size) {
249  if ((avctx->bits_per_coded_sample & 7) &&
250  avctx->bits_per_coded_sample != 12)
251  s->version = 1; // do such files exist at all?
252  else
253  s->version = 2;
254  } else
255  s->version = 0;
256 
257  if (s->version == 2) {
258  int method, interlace;
259 
260  if (avctx->extradata_size < 4)
261  return -1;
262 
263  method = ((uint8_t*)avctx->extradata)[0];
264  s->decorrelate = method & 64 ? 1 : 0;
265  s->predictor = method & 63;
266  s->bitstream_bpp = ((uint8_t*)avctx->extradata)[1];
267  if (s->bitstream_bpp == 0)
268  s->bitstream_bpp = avctx->bits_per_coded_sample & ~7;
269  interlace = (((uint8_t*)avctx->extradata)[2] & 0x30) >> 4;
270  s->interlaced = (interlace == 1) ? 1 : (interlace == 2) ? 0 : s->interlaced;
271  s->context = ((uint8_t*)avctx->extradata)[2] & 0x40 ? 1 : 0;
272 
273  if ( read_huffman_tables(s, ((uint8_t*)avctx->extradata) + 4,
274  avctx->extradata_size - 4) < 0)
275  return -1;
276  }else{
277  switch (avctx->bits_per_coded_sample & 7) {
278  case 1:
279  s->predictor = LEFT;
280  s->decorrelate = 0;
281  break;
282  case 2:
283  s->predictor = LEFT;
284  s->decorrelate = 1;
285  break;
286  case 3:
287  s->predictor = PLANE;
288  s->decorrelate = avctx->bits_per_coded_sample >= 24;
289  break;
290  case 4:
291  s->predictor = MEDIAN;
292  s->decorrelate = 0;
293  break;
294  default:
295  s->predictor = LEFT; //OLD
296  s->decorrelate = 0;
297  break;
298  }
299  s->bitstream_bpp = avctx->bits_per_coded_sample & ~7;
300  s->context = 0;
301 
302  if (read_old_huffman_tables(s) < 0)
303  return -1;
304  }
305 
306  switch (s->bitstream_bpp) {
307  case 12:
308  avctx->pix_fmt = AV_PIX_FMT_YUV420P;
309  break;
310  case 16:
311  if (s->yuy2) {
312  avctx->pix_fmt = AV_PIX_FMT_YUYV422;
313  } else {
314  avctx->pix_fmt = AV_PIX_FMT_YUV422P;
315  }
316  break;
317  case 24:
318  case 32:
319  if (s->bgr32) {
320  avctx->pix_fmt = AV_PIX_FMT_RGB32;
321  } else {
322  avctx->pix_fmt = AV_PIX_FMT_BGR24;
323  }
324  break;
325  default:
326  return AVERROR_INVALIDDATA;
327  }
328 
330 
331  return 0;
332 }
333 
335 {
336  HYuvContext *s = avctx->priv_data;
337  int i;
338 
340 
341  for (i = 0; i < 6; i++)
342  s->vlc[i].table = NULL;
343 
344  if (s->version == 2) {
345  if (read_huffman_tables(s, ((uint8_t*)avctx->extradata) + 4,
346  avctx->extradata_size) < 0)
347  return -1;
348  } else {
349  if (read_old_huffman_tables(s) < 0)
350  return -1;
351  }
352 
353  return 0;
354 }
355 
356 /* TODO instead of restarting the read when the code isn't in the first level
357  * of the joint table, jump into the 2nd level of the individual table. */
358 #define READ_2PIX(dst0, dst1, plane1){\
359  uint16_t code = get_vlc2(&s->gb, s->vlc[3+plane1].table, VLC_BITS, 1);\
360  if(code != 0xffff){\
361  dst0 = code>>8;\
362  dst1 = code;\
363  }else{\
364  dst0 = get_vlc2(&s->gb, s->vlc[0].table, VLC_BITS, 3);\
365  dst1 = get_vlc2(&s->gb, s->vlc[plane1].table, VLC_BITS, 3);\
366  }\
367 }
368 
369 static void decode_422_bitstream(HYuvContext *s, int count)
370 {
371  int i;
372 
373  count /= 2;
374 
375  if (count >= (get_bits_left(&s->gb)) / (31 * 4)) {
376  for (i = 0; i < count && get_bits_left(&s->gb) > 0; i++) {
377  READ_2PIX(s->temp[0][2 * i ], s->temp[1][i], 1);
378  READ_2PIX(s->temp[0][2 * i + 1], s->temp[2][i], 2);
379  }
380  } else {
381  for (i = 0; i < count; i++) {
382  READ_2PIX(s->temp[0][2 * i ], s->temp[1][i], 1);
383  READ_2PIX(s->temp[0][2 * i + 1], s->temp[2][i], 2);
384  }
385  }
386 }
387 
388 static void decode_gray_bitstream(HYuvContext *s, int count)
389 {
390  int i;
391 
392  count/=2;
393 
394  if (count >= (get_bits_left(&s->gb)) / (31 * 2)) {
395  for (i = 0; i < count && get_bits_left(&s->gb) > 0; i++) {
396  READ_2PIX(s->temp[0][2 * i], s->temp[0][2 * i + 1], 0);
397  }
398  } else {
399  for(i=0; i<count; i++){
400  READ_2PIX(s->temp[0][2 * i], s->temp[0][2 * i + 1], 0);
401  }
402  }
403 }
404 
405 static av_always_inline void decode_bgr_1(HYuvContext *s, int count,
406  int decorrelate, int alpha)
407 {
408  int i;
409  for (i = 0; i < count; i++) {
410  int code = get_vlc2(&s->gb, s->vlc[3].table, VLC_BITS, 1);
411  if (code != -1) {
412  *(uint32_t*)&s->temp[0][4 * i] = s->pix_bgr_map[code];
413  } else if(decorrelate) {
414  s->temp[0][4 * i + G] = get_vlc2(&s->gb, s->vlc[1].table, VLC_BITS, 3);
415  s->temp[0][4 * i + B] = get_vlc2(&s->gb, s->vlc[0].table, VLC_BITS, 3) +
416  s->temp[0][4 * i + G];
417  s->temp[0][4 * i + R] = get_vlc2(&s->gb, s->vlc[2].table, VLC_BITS, 3) +
418  s->temp[0][4 * i + G];
419  } else {
420  s->temp[0][4 * i + B] = get_vlc2(&s->gb, s->vlc[0].table, VLC_BITS, 3);
421  s->temp[0][4 * i + G] = get_vlc2(&s->gb, s->vlc[1].table, VLC_BITS, 3);
422  s->temp[0][4 * i + R] = get_vlc2(&s->gb, s->vlc[2].table, VLC_BITS, 3);
423  }
424  if (alpha)
425  s->temp[0][4 * i + A] = get_vlc2(&s->gb, s->vlc[2].table, VLC_BITS, 3);
426  }
427 }
428 
429 static void decode_bgr_bitstream(HYuvContext *s, int count)
430 {
431  if (s->decorrelate) {
432  if (s->bitstream_bpp==24)
433  decode_bgr_1(s, count, 1, 0);
434  else
435  decode_bgr_1(s, count, 1, 1);
436  } else {
437  if (s->bitstream_bpp==24)
438  decode_bgr_1(s, count, 0, 0);
439  else
440  decode_bgr_1(s, count, 0, 1);
441  }
442 }
443 
444 static void draw_slice(HYuvContext *s, AVFrame *frame, int y)
445 {
446  int h, cy, i;
447  int offset[AV_NUM_DATA_POINTERS];
448 
449  if (s->avctx->draw_horiz_band==NULL)
450  return;
451 
452  h = y - s->last_slice_end;
453  y -= h;
454 
455  if (s->bitstream_bpp == 12) {
456  cy = y>>1;
457  } else {
458  cy = y;
459  }
460 
461  offset[0] = frame->linesize[0] * y;
462  offset[1] = frame->linesize[1] * cy;
463  offset[2] = frame->linesize[2] * cy;
464  for (i = 3; i < AV_NUM_DATA_POINTERS; i++)
465  offset[i] = 0;
466  emms_c();
467 
468  s->avctx->draw_horiz_band(s->avctx, frame, offset, y, 3, h);
469 
470  s->last_slice_end = y + h;
471 }
472 
473 static int decode_frame(AVCodecContext *avctx, void *data, int *got_frame,
474  AVPacket *avpkt)
475 {
476  const uint8_t *buf = avpkt->data;
477  int buf_size = avpkt->size;
478  HYuvContext *s = avctx->priv_data;
479  const int width = s->width;
480  const int width2 = s->width>>1;
481  const int height = s->height;
482  int fake_ystride, fake_ustride, fake_vstride;
483  ThreadFrame frame = { .f = data };
484  AVFrame * const p = data;
485  int table_size = 0;
486 
489  buf_size + FF_INPUT_BUFFER_PADDING_SIZE);
490  if (!s->bitstream_buffer)
491  return AVERROR(ENOMEM);
492 
493  memset(s->bitstream_buffer + buf_size, 0, FF_INPUT_BUFFER_PADDING_SIZE);
494  s->dsp.bswap_buf((uint32_t*)s->bitstream_buffer,
495  (const uint32_t*)buf, buf_size / 4);
496 
497  if (ff_thread_get_buffer(avctx, &frame, 0) < 0) {
498  av_log(avctx, AV_LOG_ERROR, "get_buffer() failed\n");
499  return -1;
500  }
501 
502  if (s->context) {
503  table_size = read_huffman_tables(s, s->bitstream_buffer, buf_size);
504  if (table_size < 0)
505  return -1;
506  }
507 
508  if ((unsigned)(buf_size-table_size) >= INT_MAX / 8)
509  return -1;
510 
511  init_get_bits(&s->gb, s->bitstream_buffer+table_size,
512  (buf_size-table_size) * 8);
513 
514  fake_ystride = s->interlaced ? p->linesize[0] * 2 : p->linesize[0];
515  fake_ustride = s->interlaced ? p->linesize[1] * 2 : p->linesize[1];
516  fake_vstride = s->interlaced ? p->linesize[2] * 2 : p->linesize[2];
517 
518  s->last_slice_end = 0;
519 
520  if (s->bitstream_bpp < 24) {
521  int y, cy;
522  int lefty, leftu, leftv;
523  int lefttopy, lefttopu, lefttopv;
524 
525  if (s->yuy2) {
526  p->data[0][3] = get_bits(&s->gb, 8);
527  p->data[0][2] = get_bits(&s->gb, 8);
528  p->data[0][1] = get_bits(&s->gb, 8);
529  p->data[0][0] = get_bits(&s->gb, 8);
530 
531  av_log(avctx, AV_LOG_ERROR,
532  "YUY2 output is not implemented yet\n");
533  return -1;
534  } else {
535 
536  leftv = p->data[2][0] = get_bits(&s->gb, 8);
537  lefty = p->data[0][1] = get_bits(&s->gb, 8);
538  leftu = p->data[1][0] = get_bits(&s->gb, 8);
539  p->data[0][0] = get_bits(&s->gb, 8);
540 
541  switch (s->predictor) {
542  case LEFT:
543  case PLANE:
544  decode_422_bitstream(s, width-2);
545  lefty = s->dsp.add_hfyu_left_prediction(p->data[0] + 2, s->temp[0], width-2, lefty);
546  if (!(s->flags&CODEC_FLAG_GRAY)) {
547  leftu = s->dsp.add_hfyu_left_prediction(p->data[1] + 1, s->temp[1], width2 - 1, leftu);
548  leftv = s->dsp.add_hfyu_left_prediction(p->data[2] + 1, s->temp[2], width2 - 1, leftv);
549  }
550 
551  for (cy = y = 1; y < s->height; y++, cy++) {
552  uint8_t *ydst, *udst, *vdst;
553 
554  if (s->bitstream_bpp == 12) {
555  decode_gray_bitstream(s, width);
556 
557  ydst = p->data[0] + p->linesize[0] * y;
558 
559  lefty = s->dsp.add_hfyu_left_prediction(ydst, s->temp[0], width, lefty);
560  if (s->predictor == PLANE) {
561  if (y > s->interlaced)
562  s->dsp.add_bytes(ydst, ydst - fake_ystride, width);
563  }
564  y++;
565  if (y >= s->height) break;
566  }
567 
568  draw_slice(s, p, y);
569 
570  ydst = p->data[0] + p->linesize[0]*y;
571  udst = p->data[1] + p->linesize[1]*cy;
572  vdst = p->data[2] + p->linesize[2]*cy;
573 
574  decode_422_bitstream(s, width);
575  lefty = s->dsp.add_hfyu_left_prediction(ydst, s->temp[0], width, lefty);
576  if (!(s->flags & CODEC_FLAG_GRAY)) {
577  leftu= s->dsp.add_hfyu_left_prediction(udst, s->temp[1], width2, leftu);
578  leftv= s->dsp.add_hfyu_left_prediction(vdst, s->temp[2], width2, leftv);
579  }
580  if (s->predictor == PLANE) {
581  if (cy > s->interlaced) {
582  s->dsp.add_bytes(ydst, ydst - fake_ystride, width);
583  if (!(s->flags & CODEC_FLAG_GRAY)) {
584  s->dsp.add_bytes(udst, udst - fake_ustride, width2);
585  s->dsp.add_bytes(vdst, vdst - fake_vstride, width2);
586  }
587  }
588  }
589  }
590  draw_slice(s, p, height);
591 
592  break;
593  case MEDIAN:
594  /* first line except first 2 pixels is left predicted */
595  decode_422_bitstream(s, width - 2);
596  lefty= s->dsp.add_hfyu_left_prediction(p->data[0] + 2, s->temp[0], width - 2, lefty);
597  if (!(s->flags & CODEC_FLAG_GRAY)) {
598  leftu = s->dsp.add_hfyu_left_prediction(p->data[1] + 1, s->temp[1], width2 - 1, leftu);
599  leftv = s->dsp.add_hfyu_left_prediction(p->data[2] + 1, s->temp[2], width2 - 1, leftv);
600  }
601 
602  cy = y = 1;
603 
604  /* second line is left predicted for interlaced case */
605  if (s->interlaced) {
606  decode_422_bitstream(s, width);
607  lefty = s->dsp.add_hfyu_left_prediction(p->data[0] + p->linesize[0], s->temp[0], width, lefty);
608  if (!(s->flags & CODEC_FLAG_GRAY)) {
609  leftu = s->dsp.add_hfyu_left_prediction(p->data[1] + p->linesize[2], s->temp[1], width2, leftu);
610  leftv = s->dsp.add_hfyu_left_prediction(p->data[2] + p->linesize[1], s->temp[2], width2, leftv);
611  }
612  y++; cy++;
613  }
614 
615  /* next 4 pixels are left predicted too */
616  decode_422_bitstream(s, 4);
617  lefty = s->dsp.add_hfyu_left_prediction(p->data[0] + fake_ystride, s->temp[0], 4, lefty);
618  if (!(s->flags&CODEC_FLAG_GRAY)) {
619  leftu = s->dsp.add_hfyu_left_prediction(p->data[1] + fake_ustride, s->temp[1], 2, leftu);
620  leftv = s->dsp.add_hfyu_left_prediction(p->data[2] + fake_vstride, s->temp[2], 2, leftv);
621  }
622 
623  /* next line except the first 4 pixels is median predicted */
624  lefttopy = p->data[0][3];
625  decode_422_bitstream(s, width - 4);
626  s->dsp.add_hfyu_median_prediction(p->data[0] + fake_ystride+4, p->data[0]+4, s->temp[0], width-4, &lefty, &lefttopy);
627  if (!(s->flags&CODEC_FLAG_GRAY)) {
628  lefttopu = p->data[1][1];
629  lefttopv = p->data[2][1];
630  s->dsp.add_hfyu_median_prediction(p->data[1] + fake_ustride+2, p->data[1] + 2, s->temp[1], width2 - 2, &leftu, &lefttopu);
631  s->dsp.add_hfyu_median_prediction(p->data[2] + fake_vstride+2, p->data[2] + 2, s->temp[2], width2 - 2, &leftv, &lefttopv);
632  }
633  y++; cy++;
634 
635  for (; y<height; y++, cy++) {
636  uint8_t *ydst, *udst, *vdst;
637 
638  if (s->bitstream_bpp == 12) {
639  while (2 * cy > y) {
640  decode_gray_bitstream(s, width);
641  ydst = p->data[0] + p->linesize[0] * y;
642  s->dsp.add_hfyu_median_prediction(ydst, ydst - fake_ystride, s->temp[0], width, &lefty, &lefttopy);
643  y++;
644  }
645  if (y >= height) break;
646  }
647  draw_slice(s, p, y);
648 
649  decode_422_bitstream(s, width);
650 
651  ydst = p->data[0] + p->linesize[0] * y;
652  udst = p->data[1] + p->linesize[1] * cy;
653  vdst = p->data[2] + p->linesize[2] * cy;
654 
655  s->dsp.add_hfyu_median_prediction(ydst, ydst - fake_ystride, s->temp[0], width, &lefty, &lefttopy);
656  if (!(s->flags & CODEC_FLAG_GRAY)) {
657  s->dsp.add_hfyu_median_prediction(udst, udst - fake_ustride, s->temp[1], width2, &leftu, &lefttopu);
658  s->dsp.add_hfyu_median_prediction(vdst, vdst - fake_vstride, s->temp[2], width2, &leftv, &lefttopv);
659  }
660  }
661 
662  draw_slice(s, p, height);
663  break;
664  }
665  }
666  } else {
667  int y;
668  int leftr, leftg, leftb, lefta;
669  const int last_line = (height - 1) * p->linesize[0];
670 
671  if (s->bitstream_bpp == 32) {
672  lefta = p->data[0][last_line+A] = get_bits(&s->gb, 8);
673  leftr = p->data[0][last_line+R] = get_bits(&s->gb, 8);
674  leftg = p->data[0][last_line+G] = get_bits(&s->gb, 8);
675  leftb = p->data[0][last_line+B] = get_bits(&s->gb, 8);
676  } else {
677  leftr = p->data[0][last_line+R] = get_bits(&s->gb, 8);
678  leftg = p->data[0][last_line+G] = get_bits(&s->gb, 8);
679  leftb = p->data[0][last_line+B] = get_bits(&s->gb, 8);
680  lefta = p->data[0][last_line+A] = 255;
681  skip_bits(&s->gb, 8);
682  }
683 
684  if (s->bgr32) {
685  switch (s->predictor) {
686  case LEFT:
687  case PLANE:
688  decode_bgr_bitstream(s, width - 1);
689  s->dsp.add_hfyu_left_prediction_bgr32(p->data[0] + last_line+4, s->temp[0], width - 1, &leftr, &leftg, &leftb, &lefta);
690 
691  for (y = s->height - 2; y >= 0; y--) { //Yes it is stored upside down.
692  decode_bgr_bitstream(s, width);
693 
694  s->dsp.add_hfyu_left_prediction_bgr32(p->data[0] + p->linesize[0]*y, s->temp[0], width, &leftr, &leftg, &leftb, &lefta);
695  if (s->predictor == PLANE) {
696  if (s->bitstream_bpp != 32) lefta = 0;
697  if ((y & s->interlaced) == 0 &&
698  y < s->height - 1 - s->interlaced) {
699  s->dsp.add_bytes(p->data[0] + p->linesize[0] * y,
700  p->data[0] + p->linesize[0] * y +
701  fake_ystride, fake_ystride);
702  }
703  }
704  }
705  // just 1 large slice as this is not possible in reverse order
706  draw_slice(s, p, height);
707  break;
708  default:
709  av_log(avctx, AV_LOG_ERROR,
710  "prediction type not supported!\n");
711  }
712  }else{
713  av_log(avctx, AV_LOG_ERROR,
714  "BGR24 output is not implemented yet\n");
715  return -1;
716  }
717  }
718  emms_c();
719 
720  *got_frame = 1;
721 
722  return (get_bits_count(&s->gb) + 31) / 32 * 4 + table_size;
723 }
724 
726 {
727  HYuvContext *s = avctx->priv_data;
728  int i;
729 
732 
733  for (i = 0; i < 6; i++) {
734  ff_free_vlc(&s->vlc[i]);
735  }
736 
737  return 0;
738 }
739 
740 #if CONFIG_HUFFYUV_DECODER
741 AVCodec ff_huffyuv_decoder = {
742  .name = "huffyuv",
743  .long_name = NULL_IF_CONFIG_SMALL("Huffyuv / HuffYUV"),
744  .type = AVMEDIA_TYPE_VIDEO,
745  .id = AV_CODEC_ID_HUFFYUV,
746  .priv_data_size = sizeof(HYuvContext),
747  .init = decode_init,
748  .close = decode_end,
749  .decode = decode_frame,
750  .capabilities = CODEC_CAP_DR1 | CODEC_CAP_DRAW_HORIZ_BAND |
753 };
754 #endif
755 
756 #if CONFIG_FFVHUFF_DECODER
757 AVCodec ff_ffvhuff_decoder = {
758  .name = "ffvhuff",
759  .long_name = NULL_IF_CONFIG_SMALL("Huffyuv FFmpeg variant"),
760  .type = AVMEDIA_TYPE_VIDEO,
761  .id = AV_CODEC_ID_FFVHUFF,
762  .priv_data_size = sizeof(HYuvContext),
763  .init = decode_init,
764  .close = decode_end,
765  .decode = decode_frame,
766  .capabilities = CODEC_CAP_DR1 | CODEC_CAP_DRAW_HORIZ_BAND |
769 };
770 #endif