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 "dsputil.h"
33 #include "get_bits.h"
34 #include "huffyuv.h"
35 #include "thread.h"
36 
37 #define classic_shift_luma_table_size 42
39  34,36,35,69,135,232,9,16,10,24,11,23,12,16,13,10,14,8,15,8,
40  16,8,17,20,16,10,207,206,205,236,11,8,10,21,9,23,8,8,199,70,
41  69,68, 0
42 };
43 
44 #define classic_shift_chroma_table_size 59
46  66,36,37,38,39,40,41,75,76,77,110,239,144,81,82,83,84,85,118,183,
47  56,57,88,89,56,89,154,57,58,57,26,141,57,56,58,57,58,57,184,119,
48  214,245,116,83,82,49,80,79,78,77,44,75,41,40,39,38,37,36,34, 0
49 };
50 
51 static const unsigned char classic_add_luma[256] = {
52  3, 9, 5, 12, 10, 35, 32, 29, 27, 50, 48, 45, 44, 41, 39, 37,
53  73, 70, 68, 65, 64, 61, 58, 56, 53, 50, 49, 46, 44, 41, 38, 36,
54  68, 65, 63, 61, 58, 55, 53, 51, 48, 46, 45, 43, 41, 39, 38, 36,
55  35, 33, 32, 30, 29, 27, 26, 25, 48, 47, 46, 44, 43, 41, 40, 39,
56  37, 36, 35, 34, 32, 31, 30, 28, 27, 26, 24, 23, 22, 20, 19, 37,
57  35, 34, 33, 31, 30, 29, 27, 26, 24, 23, 21, 20, 18, 17, 15, 29,
58  27, 26, 24, 22, 21, 19, 17, 16, 14, 26, 25, 23, 21, 19, 18, 16,
59  15, 27, 25, 23, 21, 19, 17, 16, 14, 26, 25, 23, 21, 18, 17, 14,
60  12, 17, 19, 13, 4, 9, 2, 11, 1, 7, 8, 0, 16, 3, 14, 6,
61  12, 10, 5, 15, 18, 11, 10, 13, 15, 16, 19, 20, 22, 24, 27, 15,
62  18, 20, 22, 24, 26, 14, 17, 20, 22, 24, 27, 15, 18, 20, 23, 25,
63  28, 16, 19, 22, 25, 28, 32, 36, 21, 25, 29, 33, 38, 42, 45, 49,
64  28, 31, 34, 37, 40, 42, 44, 47, 49, 50, 52, 54, 56, 57, 59, 60,
65  62, 64, 66, 67, 69, 35, 37, 39, 40, 42, 43, 45, 47, 48, 51, 52,
66  54, 55, 57, 59, 60, 62, 63, 66, 67, 69, 71, 72, 38, 40, 42, 43,
67  46, 47, 49, 51, 26, 28, 30, 31, 33, 34, 18, 19, 11, 13, 7, 8,
68 };
69 
70 static const unsigned char classic_add_chroma[256] = {
71  3, 1, 2, 2, 2, 2, 3, 3, 7, 5, 7, 5, 8, 6, 11, 9,
72  7, 13, 11, 10, 9, 8, 7, 5, 9, 7, 6, 4, 7, 5, 8, 7,
73  11, 8, 13, 11, 19, 15, 22, 23, 20, 33, 32, 28, 27, 29, 51, 77,
74  43, 45, 76, 81, 46, 82, 75, 55, 56,144, 58, 80, 60, 74,147, 63,
75  143, 65, 66, 67, 68, 69, 70, 71, 72, 73, 74, 75, 76, 77, 78, 79,
76  80, 81, 82, 83, 84, 85, 86, 87, 88, 89, 90, 91, 27, 30, 21, 22,
77  17, 14, 5, 6,100, 54, 47, 50, 51, 53,106,107,108,109,110,111,
78  112,113,114,115, 4,117,118, 92, 94,121,122, 3,124,103, 2, 1,
79  0,129,130,131,120,119,126,125,136,137,138,139,140,141,142,134,
80  135,132,133,104, 64,101, 62, 57,102, 95, 93, 59, 61, 28, 97, 96,
81  52, 49, 48, 29, 32, 25, 24, 46, 23, 98, 45, 44, 43, 20, 42, 41,
82  19, 18, 99, 40, 15, 39, 38, 16, 13, 12, 11, 37, 10, 9, 8, 36,
83  7,128,127,105,123,116, 35, 34, 33,145, 31, 79, 42,146, 78, 26,
84  83, 48, 49, 50, 44, 47, 26, 31, 30, 18, 17, 19, 21, 24, 25, 13,
85  14, 16, 17, 18, 20, 21, 12, 14, 15, 9, 10, 6, 9, 6, 5, 8,
86  6, 12, 8, 10, 7, 9, 6, 4, 6, 2, 2, 3, 3, 3, 3, 2,
87 };
88 
89 static int read_len_table(uint8_t *dst, GetBitContext *gb)
90 {
91  int i, val, repeat;
92 
93  for (i = 0; i < 256;) {
94  repeat = get_bits(gb, 3);
95  val = get_bits(gb, 5);
96  if (repeat == 0)
97  repeat = get_bits(gb, 8);
98  if (i + repeat > 256 || get_bits_left(gb) < 0) {
99  av_log(NULL, AV_LOG_ERROR, "Error reading huffman table\n");
100  return -1;
101  }
102  while (repeat--)
103  dst[i++] = val;
104  }
105  return 0;
106 }
107 
109 {
110  uint16_t symbols[1 << VLC_BITS];
111  uint16_t bits[1 << VLC_BITS];
112  uint8_t len[1 << VLC_BITS];
113  if (s->bitstream_bpp < 24) {
114  int p, i, y, u;
115  for (p = 0; p < 3; p++) {
116  for (i = y = 0; y < 256; y++) {
117  int len0 = s->len[0][y];
118  int limit = VLC_BITS - len0;
119  if(limit <= 0)
120  continue;
121  for (u = 0; u < 256; u++) {
122  int len1 = s->len[p][u];
123  if (len1 > limit)
124  continue;
125  len[i] = len0 + len1;
126  bits[i] = (s->bits[0][y] << len1) + s->bits[p][u];
127  symbols[i] = (y << 8) + u;
128  if(symbols[i] != 0xffff) // reserved to mean "invalid"
129  i++;
130  }
131  }
132  ff_free_vlc(&s->vlc[3 + p]);
133  ff_init_vlc_sparse(&s->vlc[3 + p], VLC_BITS, i, len, 1, 1,
134  bits, 2, 2, symbols, 2, 2, 0);
135  }
136  } else {
137  uint8_t (*map)[4] = (uint8_t(*)[4])s->pix_bgr_map;
138  int i, b, g, r, code;
139  int p0 = s->decorrelate;
140  int p1 = !s->decorrelate;
141  // restrict the range to +/-16 because that's pretty much guaranteed to
142  // cover all the combinations that fit in 11 bits total, and it doesn't
143  // matter if we miss a few rare codes.
144  for (i = 0, g = -16; g < 16; g++) {
145  int len0 = s->len[p0][g & 255];
146  int limit0 = VLC_BITS - len0;
147  if (limit0 < 2)
148  continue;
149  for (b = -16; b < 16; b++) {
150  int len1 = s->len[p1][b & 255];
151  int limit1 = limit0 - len1;
152  if (limit1 < 1)
153  continue;
154  code = (s->bits[p0][g & 255] << len1) + s->bits[p1][b & 255];
155  for (r = -16; r < 16; r++) {
156  int len2 = s->len[2][r & 255];
157  if (len2 > limit1)
158  continue;
159  len[i] = len0 + len1 + len2;
160  bits[i] = (code << len2) + s->bits[2][r & 255];
161  if (s->decorrelate) {
162  map[i][G] = g;
163  map[i][B] = g + b;
164  map[i][R] = g + r;
165  } else {
166  map[i][B] = g;
167  map[i][G] = b;
168  map[i][R] = r;
169  }
170  i++;
171  }
172  }
173  }
174  ff_free_vlc(&s->vlc[3]);
175  init_vlc(&s->vlc[3], VLC_BITS, i, len, 1, 1, bits, 2, 2, 0);
176  }
177 }
178 
179 static int read_huffman_tables(HYuvContext *s, const uint8_t *src, int length)
180 {
181  GetBitContext gb;
182  int i;
183 
184  init_get_bits(&gb, src, length * 8);
185 
186  for (i = 0; i < 3; i++) {
187  if (read_len_table(s->len[i], &gb) < 0)
188  return -1;
189  if (ff_huffyuv_generate_bits_table(s->bits[i], s->len[i]) < 0) {
190  return -1;
191  }
192  ff_free_vlc(&s->vlc[i]);
193  init_vlc(&s->vlc[i], VLC_BITS, 256, s->len[i], 1, 1,
194  s->bits[i], 4, 4, 0);
195  }
196 
198 
199  return (get_bits_count(&gb) + 7) / 8;
200 }
201 
203 {
204  GetBitContext gb;
205  int i;
206 
209  if (read_len_table(s->len[0], &gb) < 0)
210  return -1;
211 
214  if (read_len_table(s->len[1], &gb) < 0)
215  return -1;
216 
217  for(i=0; i<256; i++) s->bits[0][i] = classic_add_luma [i];
218  for(i=0; i<256; i++) s->bits[1][i] = classic_add_chroma[i];
219 
220  if (s->bitstream_bpp >= 24) {
221  memcpy(s->bits[1], s->bits[0], 256 * sizeof(uint32_t));
222  memcpy(s->len[1] , s->len [0], 256 * sizeof(uint8_t));
223  }
224  memcpy(s->bits[2], s->bits[1], 256 * sizeof(uint32_t));
225  memcpy(s->len[2] , s->len [1], 256 * sizeof(uint8_t));
226 
227  for (i = 0; i < 3; i++) {
228  ff_free_vlc(&s->vlc[i]);
229  init_vlc(&s->vlc[i], VLC_BITS, 256, s->len[i], 1, 1,
230  s->bits[i], 4, 4, 0);
231  }
232 
234 
235  return 0;
236 }
237 
239 {
240  HYuvContext *s = avctx->priv_data;
241 
242  ff_huffyuv_common_init(avctx);
243  memset(s->vlc, 0, 3 * sizeof(VLC));
244 
245  avctx->coded_frame = &s->picture;
246  s->interlaced = s->height > 288;
247 
248  s->bgr32 = 1;
249 
250  if (avctx->extradata_size) {
251  if ((avctx->bits_per_coded_sample & 7) &&
252  avctx->bits_per_coded_sample != 12)
253  s->version = 1; // do such files exist at all?
254  else
255  s->version = 2;
256  } else
257  s->version = 0;
258 
259  if (s->version == 2) {
260  int method, interlace;
261 
262  if (avctx->extradata_size < 4)
263  return -1;
264 
265  method = ((uint8_t*)avctx->extradata)[0];
266  s->decorrelate = method & 64 ? 1 : 0;
267  s->predictor = method & 63;
268  s->bitstream_bpp = ((uint8_t*)avctx->extradata)[1];
269  if (s->bitstream_bpp == 0)
270  s->bitstream_bpp = avctx->bits_per_coded_sample & ~7;
271  interlace = (((uint8_t*)avctx->extradata)[2] & 0x30) >> 4;
272  s->interlaced = (interlace == 1) ? 1 : (interlace == 2) ? 0 : s->interlaced;
273  s->context = ((uint8_t*)avctx->extradata)[2] & 0x40 ? 1 : 0;
274 
275  if ( read_huffman_tables(s, ((uint8_t*)avctx->extradata) + 4,
276  avctx->extradata_size - 4) < 0)
277  return -1;
278  }else{
279  switch (avctx->bits_per_coded_sample & 7) {
280  case 1:
281  s->predictor = LEFT;
282  s->decorrelate = 0;
283  break;
284  case 2:
285  s->predictor = LEFT;
286  s->decorrelate = 1;
287  break;
288  case 3:
289  s->predictor = PLANE;
290  s->decorrelate = avctx->bits_per_coded_sample >= 24;
291  break;
292  case 4:
293  s->predictor = MEDIAN;
294  s->decorrelate = 0;
295  break;
296  default:
297  s->predictor = LEFT; //OLD
298  s->decorrelate = 0;
299  break;
300  }
301  s->bitstream_bpp = avctx->bits_per_coded_sample & ~7;
302  s->context = 0;
303 
304  if (read_old_huffman_tables(s) < 0)
305  return -1;
306  }
307 
308  switch (s->bitstream_bpp) {
309  case 12:
310  avctx->pix_fmt = AV_PIX_FMT_YUV420P;
311  break;
312  case 16:
313  if (s->yuy2) {
314  avctx->pix_fmt = AV_PIX_FMT_YUYV422;
315  } else {
316  avctx->pix_fmt = AV_PIX_FMT_YUV422P;
317  }
318  break;
319  case 24:
320  case 32:
321  if (s->bgr32) {
322  avctx->pix_fmt = AV_PIX_FMT_RGB32;
323  } else {
324  avctx->pix_fmt = AV_PIX_FMT_BGR24;
325  }
326  break;
327  default:
328  return AVERROR_INVALIDDATA;
329  }
330 
332 
333  return 0;
334 }
335 
337 {
338  HYuvContext *s = avctx->priv_data;
339  int i;
340 
341  avctx->coded_frame= &s->picture;
343 
344  for (i = 0; i < 6; i++)
345  s->vlc[i].table = NULL;
346 
347  if (s->version == 2) {
348  if (read_huffman_tables(s, ((uint8_t*)avctx->extradata) + 4,
349  avctx->extradata_size) < 0)
350  return -1;
351  } else {
352  if (read_old_huffman_tables(s) < 0)
353  return -1;
354  }
355 
356  return 0;
357 }
358 
359 /* TODO instead of restarting the read when the code isn't in the first level
360  * of the joint table, jump into the 2nd level of the individual table. */
361 #define READ_2PIX(dst0, dst1, plane1){\
362  uint16_t code = get_vlc2(&s->gb, s->vlc[3+plane1].table, VLC_BITS, 1);\
363  if(code != 0xffff){\
364  dst0 = code>>8;\
365  dst1 = code;\
366  }else{\
367  dst0 = get_vlc2(&s->gb, s->vlc[0].table, VLC_BITS, 3);\
368  dst1 = get_vlc2(&s->gb, s->vlc[plane1].table, VLC_BITS, 3);\
369  }\
370 }
371 
372 static void decode_422_bitstream(HYuvContext *s, int count)
373 {
374  int i;
375 
376  count /= 2;
377 
378  if (count >= (get_bits_left(&s->gb)) / (31 * 4)) {
379  for (i = 0; i < count && get_bits_left(&s->gb) > 0; i++) {
380  READ_2PIX(s->temp[0][2 * i ], s->temp[1][i], 1);
381  READ_2PIX(s->temp[0][2 * i + 1], s->temp[2][i], 2);
382  }
383  } else {
384  for (i = 0; i < count; i++) {
385  READ_2PIX(s->temp[0][2 * i ], s->temp[1][i], 1);
386  READ_2PIX(s->temp[0][2 * i + 1], s->temp[2][i], 2);
387  }
388  }
389 }
390 
391 static void decode_gray_bitstream(HYuvContext *s, int count)
392 {
393  int i;
394 
395  count/=2;
396 
397  if (count >= (get_bits_left(&s->gb)) / (31 * 2)) {
398  for (i = 0; i < count && get_bits_left(&s->gb) > 0; i++) {
399  READ_2PIX(s->temp[0][2 * i], s->temp[0][2 * i + 1], 0);
400  }
401  } else {
402  for(i=0; i<count; i++){
403  READ_2PIX(s->temp[0][2 * i], s->temp[0][2 * i + 1], 0);
404  }
405  }
406 }
407 
408 static av_always_inline void decode_bgr_1(HYuvContext *s, int count,
409  int decorrelate, int alpha)
410 {
411  int i;
412  for (i = 0; i < count; i++) {
413  int code = get_vlc2(&s->gb, s->vlc[3].table, VLC_BITS, 1);
414  if (code != -1) {
415  *(uint32_t*)&s->temp[0][4 * i] = s->pix_bgr_map[code];
416  } else if(decorrelate) {
417  s->temp[0][4 * i + G] = get_vlc2(&s->gb, s->vlc[1].table, VLC_BITS, 3);
418  s->temp[0][4 * i + B] = get_vlc2(&s->gb, s->vlc[0].table, VLC_BITS, 3) +
419  s->temp[0][4 * i + G];
420  s->temp[0][4 * i + R] = get_vlc2(&s->gb, s->vlc[2].table, VLC_BITS, 3) +
421  s->temp[0][4 * i + G];
422  } else {
423  s->temp[0][4 * i + B] = get_vlc2(&s->gb, s->vlc[0].table, VLC_BITS, 3);
424  s->temp[0][4 * i + G] = get_vlc2(&s->gb, s->vlc[1].table, VLC_BITS, 3);
425  s->temp[0][4 * i + R] = get_vlc2(&s->gb, s->vlc[2].table, VLC_BITS, 3);
426  }
427  if (alpha)
428  s->temp[0][4 * i + A] = get_vlc2(&s->gb, s->vlc[2].table, VLC_BITS, 3);
429  }
430 }
431 
432 static void decode_bgr_bitstream(HYuvContext *s, int count)
433 {
434  if (s->decorrelate) {
435  if (s->bitstream_bpp==24)
436  decode_bgr_1(s, count, 1, 0);
437  else
438  decode_bgr_1(s, count, 1, 1);
439  } else {
440  if (s->bitstream_bpp==24)
441  decode_bgr_1(s, count, 0, 0);
442  else
443  decode_bgr_1(s, count, 0, 1);
444  }
445 }
446 
447 static void draw_slice(HYuvContext *s, int y)
448 {
449  int h, cy, i;
450  int offset[AV_NUM_DATA_POINTERS];
451 
452  if (s->avctx->draw_horiz_band==NULL)
453  return;
454 
455  h = y - s->last_slice_end;
456  y -= h;
457 
458  if (s->bitstream_bpp == 12) {
459  cy = y>>1;
460  } else {
461  cy = y;
462  }
463 
464  offset[0] = s->picture.linesize[0]*y;
465  offset[1] = s->picture.linesize[1]*cy;
466  offset[2] = s->picture.linesize[2]*cy;
467  for (i = 3; i < AV_NUM_DATA_POINTERS; i++)
468  offset[i] = 0;
469  emms_c();
470 
471  s->avctx->draw_horiz_band(s->avctx, &s->picture, offset, y, 3, h);
472 
473  s->last_slice_end = y + h;
474 }
475 
476 static int decode_frame(AVCodecContext *avctx, void *data, int *got_frame,
477  AVPacket *avpkt)
478 {
479  const uint8_t *buf = avpkt->data;
480  int buf_size = avpkt->size;
481  HYuvContext *s = avctx->priv_data;
482  const int width = s->width;
483  const int width2 = s->width>>1;
484  const int height = s->height;
485  int fake_ystride, fake_ustride, fake_vstride;
486  AVFrame * const p = &s->picture;
487  int table_size = 0;
488 
489  AVFrame *picture = data;
490 
493  buf_size + FF_INPUT_BUFFER_PADDING_SIZE);
494  if (!s->bitstream_buffer)
495  return AVERROR(ENOMEM);
496 
497  memset(s->bitstream_buffer + buf_size, 0, FF_INPUT_BUFFER_PADDING_SIZE);
498  s->dsp.bswap_buf((uint32_t*)s->bitstream_buffer,
499  (const uint32_t*)buf, buf_size / 4);
500 
501  if (p->data[0])
502  ff_thread_release_buffer(avctx, p);
503 
504  p->reference = 0;
505  if (ff_thread_get_buffer(avctx, p) < 0) {
506  av_log(avctx, AV_LOG_ERROR, "get_buffer() failed\n");
507  return -1;
508  }
509 
510  if (s->context) {
511  table_size = read_huffman_tables(s, s->bitstream_buffer, buf_size);
512  if (table_size < 0)
513  return -1;
514  }
515 
516  if ((unsigned)(buf_size-table_size) >= INT_MAX / 8)
517  return -1;
518 
519  init_get_bits(&s->gb, s->bitstream_buffer+table_size,
520  (buf_size-table_size) * 8);
521 
522  fake_ystride = s->interlaced ? p->linesize[0] * 2 : p->linesize[0];
523  fake_ustride = s->interlaced ? p->linesize[1] * 2 : p->linesize[1];
524  fake_vstride = s->interlaced ? p->linesize[2] * 2 : p->linesize[2];
525 
526  s->last_slice_end = 0;
527 
528  if (s->bitstream_bpp < 24) {
529  int y, cy;
530  int lefty, leftu, leftv;
531  int lefttopy, lefttopu, lefttopv;
532 
533  if (s->yuy2) {
534  p->data[0][3] = get_bits(&s->gb, 8);
535  p->data[0][2] = get_bits(&s->gb, 8);
536  p->data[0][1] = get_bits(&s->gb, 8);
537  p->data[0][0] = get_bits(&s->gb, 8);
538 
539  av_log(avctx, AV_LOG_ERROR,
540  "YUY2 output is not implemented yet\n");
541  return -1;
542  } else {
543 
544  leftv = p->data[2][0] = get_bits(&s->gb, 8);
545  lefty = p->data[0][1] = get_bits(&s->gb, 8);
546  leftu = p->data[1][0] = get_bits(&s->gb, 8);
547  p->data[0][0] = get_bits(&s->gb, 8);
548 
549  switch (s->predictor) {
550  case LEFT:
551  case PLANE:
552  decode_422_bitstream(s, width-2);
553  lefty = s->dsp.add_hfyu_left_prediction(p->data[0] + 2, s->temp[0], width-2, lefty);
554  if (!(s->flags&CODEC_FLAG_GRAY)) {
555  leftu = s->dsp.add_hfyu_left_prediction(p->data[1] + 1, s->temp[1], width2 - 1, leftu);
556  leftv = s->dsp.add_hfyu_left_prediction(p->data[2] + 1, s->temp[2], width2 - 1, leftv);
557  }
558 
559  for (cy = y = 1; y < s->height; y++, cy++) {
560  uint8_t *ydst, *udst, *vdst;
561 
562  if (s->bitstream_bpp == 12) {
563  decode_gray_bitstream(s, width);
564 
565  ydst = p->data[0] + p->linesize[0] * y;
566 
567  lefty = s->dsp.add_hfyu_left_prediction(ydst, s->temp[0], width, lefty);
568  if (s->predictor == PLANE) {
569  if (y > s->interlaced)
570  s->dsp.add_bytes(ydst, ydst - fake_ystride, width);
571  }
572  y++;
573  if (y >= s->height) break;
574  }
575 
576  draw_slice(s, y);
577 
578  ydst = p->data[0] + p->linesize[0]*y;
579  udst = p->data[1] + p->linesize[1]*cy;
580  vdst = p->data[2] + p->linesize[2]*cy;
581 
582  decode_422_bitstream(s, width);
583  lefty = s->dsp.add_hfyu_left_prediction(ydst, s->temp[0], width, lefty);
584  if (!(s->flags & CODEC_FLAG_GRAY)) {
585  leftu= s->dsp.add_hfyu_left_prediction(udst, s->temp[1], width2, leftu);
586  leftv= s->dsp.add_hfyu_left_prediction(vdst, s->temp[2], width2, leftv);
587  }
588  if (s->predictor == PLANE) {
589  if (cy > s->interlaced) {
590  s->dsp.add_bytes(ydst, ydst - fake_ystride, width);
591  if (!(s->flags & CODEC_FLAG_GRAY)) {
592  s->dsp.add_bytes(udst, udst - fake_ustride, width2);
593  s->dsp.add_bytes(vdst, vdst - fake_vstride, width2);
594  }
595  }
596  }
597  }
598  draw_slice(s, height);
599 
600  break;
601  case MEDIAN:
602  /* first line except first 2 pixels is left predicted */
603  decode_422_bitstream(s, width - 2);
604  lefty= s->dsp.add_hfyu_left_prediction(p->data[0] + 2, s->temp[0], width - 2, lefty);
605  if (!(s->flags & CODEC_FLAG_GRAY)) {
606  leftu = s->dsp.add_hfyu_left_prediction(p->data[1] + 1, s->temp[1], width2 - 1, leftu);
607  leftv = s->dsp.add_hfyu_left_prediction(p->data[2] + 1, s->temp[2], width2 - 1, leftv);
608  }
609 
610  cy = y = 1;
611 
612  /* second line is left predicted for interlaced case */
613  if (s->interlaced) {
614  decode_422_bitstream(s, width);
615  lefty = s->dsp.add_hfyu_left_prediction(p->data[0] + p->linesize[0], s->temp[0], width, lefty);
616  if (!(s->flags & CODEC_FLAG_GRAY)) {
617  leftu = s->dsp.add_hfyu_left_prediction(p->data[1] + p->linesize[2], s->temp[1], width2, leftu);
618  leftv = s->dsp.add_hfyu_left_prediction(p->data[2] + p->linesize[1], s->temp[2], width2, leftv);
619  }
620  y++; cy++;
621  }
622 
623  /* next 4 pixels are left predicted too */
624  decode_422_bitstream(s, 4);
625  lefty = s->dsp.add_hfyu_left_prediction(p->data[0] + fake_ystride, s->temp[0], 4, lefty);
626  if (!(s->flags&CODEC_FLAG_GRAY)) {
627  leftu = s->dsp.add_hfyu_left_prediction(p->data[1] + fake_ustride, s->temp[1], 2, leftu);
628  leftv = s->dsp.add_hfyu_left_prediction(p->data[2] + fake_vstride, s->temp[2], 2, leftv);
629  }
630 
631  /* next line except the first 4 pixels is median predicted */
632  lefttopy = p->data[0][3];
633  decode_422_bitstream(s, width - 4);
634  s->dsp.add_hfyu_median_prediction(p->data[0] + fake_ystride+4, p->data[0]+4, s->temp[0], width-4, &lefty, &lefttopy);
635  if (!(s->flags&CODEC_FLAG_GRAY)) {
636  lefttopu = p->data[1][1];
637  lefttopv = p->data[2][1];
638  s->dsp.add_hfyu_median_prediction(p->data[1] + fake_ustride+2, p->data[1] + 2, s->temp[1], width2 - 2, &leftu, &lefttopu);
639  s->dsp.add_hfyu_median_prediction(p->data[2] + fake_vstride+2, p->data[2] + 2, s->temp[2], width2 - 2, &leftv, &lefttopv);
640  }
641  y++; cy++;
642 
643  for (; y<height; y++, cy++) {
644  uint8_t *ydst, *udst, *vdst;
645 
646  if (s->bitstream_bpp == 12) {
647  while (2 * cy > y) {
648  decode_gray_bitstream(s, width);
649  ydst = p->data[0] + p->linesize[0] * y;
650  s->dsp.add_hfyu_median_prediction(ydst, ydst - fake_ystride, s->temp[0], width, &lefty, &lefttopy);
651  y++;
652  }
653  if (y >= height) break;
654  }
655  draw_slice(s, y);
656 
657  decode_422_bitstream(s, width);
658 
659  ydst = p->data[0] + p->linesize[0] * y;
660  udst = p->data[1] + p->linesize[1] * cy;
661  vdst = p->data[2] + p->linesize[2] * cy;
662 
663  s->dsp.add_hfyu_median_prediction(ydst, ydst - fake_ystride, s->temp[0], width, &lefty, &lefttopy);
664  if (!(s->flags & CODEC_FLAG_GRAY)) {
665  s->dsp.add_hfyu_median_prediction(udst, udst - fake_ustride, s->temp[1], width2, &leftu, &lefttopu);
666  s->dsp.add_hfyu_median_prediction(vdst, vdst - fake_vstride, s->temp[2], width2, &leftv, &lefttopv);
667  }
668  }
669 
670  draw_slice(s, height);
671  break;
672  }
673  }
674  } else {
675  int y;
676  int leftr, leftg, leftb, lefta;
677  const int last_line = (height - 1) * p->linesize[0];
678 
679  if (s->bitstream_bpp == 32) {
680  lefta = p->data[0][last_line+A] = get_bits(&s->gb, 8);
681  leftr = p->data[0][last_line+R] = get_bits(&s->gb, 8);
682  leftg = p->data[0][last_line+G] = get_bits(&s->gb, 8);
683  leftb = p->data[0][last_line+B] = get_bits(&s->gb, 8);
684  } else {
685  leftr = p->data[0][last_line+R] = get_bits(&s->gb, 8);
686  leftg = p->data[0][last_line+G] = get_bits(&s->gb, 8);
687  leftb = p->data[0][last_line+B] = get_bits(&s->gb, 8);
688  lefta = p->data[0][last_line+A] = 255;
689  skip_bits(&s->gb, 8);
690  }
691 
692  if (s->bgr32) {
693  switch (s->predictor) {
694  case LEFT:
695  case PLANE:
696  decode_bgr_bitstream(s, width - 1);
697  s->dsp.add_hfyu_left_prediction_bgr32(p->data[0] + last_line+4, s->temp[0], width - 1, &leftr, &leftg, &leftb, &lefta);
698 
699  for (y = s->height - 2; y >= 0; y--) { //Yes it is stored upside down.
700  decode_bgr_bitstream(s, width);
701 
702  s->dsp.add_hfyu_left_prediction_bgr32(p->data[0] + p->linesize[0]*y, s->temp[0], width, &leftr, &leftg, &leftb, &lefta);
703  if (s->predictor == PLANE) {
704  if (s->bitstream_bpp != 32) lefta = 0;
705  if ((y & s->interlaced) == 0 &&
706  y < s->height - 1 - s->interlaced) {
707  s->dsp.add_bytes(p->data[0] + p->linesize[0] * y,
708  p->data[0] + p->linesize[0] * y +
709  fake_ystride, fake_ystride);
710  }
711  }
712  }
713  // just 1 large slice as this is not possible in reverse order
714  draw_slice(s, height);
715  break;
716  default:
717  av_log(avctx, AV_LOG_ERROR,
718  "prediction type not supported!\n");
719  }
720  }else{
721  av_log(avctx, AV_LOG_ERROR,
722  "BGR24 output is not implemented yet\n");
723  return -1;
724  }
725  }
726  emms_c();
727 
728  *picture = *p;
729  *got_frame = 1;
730 
731  return (get_bits_count(&s->gb) + 31) / 32 * 4 + table_size;
732 }
733 
735 {
736  HYuvContext *s = avctx->priv_data;
737  int i;
738 
739  if (s->picture.data[0])
740  avctx->release_buffer(avctx, &s->picture);
741 
744 
745  for (i = 0; i < 6; i++) {
746  ff_free_vlc(&s->vlc[i]);
747  }
748 
749  return 0;
750 }
751 
752 #if CONFIG_HUFFYUV_DECODER
753 AVCodec ff_huffyuv_decoder = {
754  .name = "huffyuv",
755  .type = AVMEDIA_TYPE_VIDEO,
756  .id = AV_CODEC_ID_HUFFYUV,
757  .priv_data_size = sizeof(HYuvContext),
758  .init = decode_init,
759  .close = decode_end,
760  .decode = decode_frame,
761  .capabilities = CODEC_CAP_DR1 | CODEC_CAP_DRAW_HORIZ_BAND |
762  CODEC_CAP_FRAME_THREADS,
764  .long_name = NULL_IF_CONFIG_SMALL("Huffyuv / HuffYUV"),
765 };
766 #endif
767 
768 #if CONFIG_FFVHUFF_DECODER
769 AVCodec ff_ffvhuff_decoder = {
770  .name = "ffvhuff",
771  .type = AVMEDIA_TYPE_VIDEO,
772  .id = AV_CODEC_ID_FFVHUFF,
773  .priv_data_size = sizeof(HYuvContext),
774  .init = decode_init,
775  .close = decode_end,
776  .decode = decode_frame,
777  .capabilities = CODEC_CAP_DR1 | CODEC_CAP_DRAW_HORIZ_BAND |
778  CODEC_CAP_FRAME_THREADS,
780  .long_name = NULL_IF_CONFIG_SMALL("Huffyuv FFmpeg variant"),
781 };
782 #endif