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  int ret;
113 
114  if (s->bitstream_bpp < 24) {
115  int p, i, y, u;
116  for (p = 0; p < 3; p++) {
117  for (i = y = 0; y < 256; y++) {
118  int len0 = s->len[0][y];
119  int limit = VLC_BITS - len0;
120  if(limit <= 0)
121  continue;
122  for (u = 0; u < 256; u++) {
123  int len1 = s->len[p][u];
124  if (len1 > limit)
125  continue;
126  len[i] = len0 + len1;
127  bits[i] = (s->bits[0][y] << len1) + s->bits[p][u];
128  symbols[i] = (y << 8) + u;
129  if(symbols[i] != 0xffff) // reserved to mean "invalid"
130  i++;
131  }
132  }
133  ff_free_vlc(&s->vlc[3 + p]);
134  if ((ret = ff_init_vlc_sparse(&s->vlc[3 + p], VLC_BITS, i, len, 1, 1,
135  bits, 2, 2, symbols, 2, 2, 0)) < 0)
136  return ret;
137  }
138  } else {
139  uint8_t (*map)[4] = (uint8_t(*)[4])s->pix_bgr_map;
140  int i, b, g, r, code;
141  int p0 = s->decorrelate;
142  int p1 = !s->decorrelate;
143  // restrict the range to +/-16 because that's pretty much guaranteed to
144  // cover all the combinations that fit in 11 bits total, and it doesn't
145  // matter if we miss a few rare codes.
146  for (i = 0, g = -16; g < 16; g++) {
147  int len0 = s->len[p0][g & 255];
148  int limit0 = VLC_BITS - len0;
149  if (limit0 < 2)
150  continue;
151  for (b = -16; b < 16; b++) {
152  int len1 = s->len[p1][b & 255];
153  int limit1 = limit0 - len1;
154  if (limit1 < 1)
155  continue;
156  code = (s->bits[p0][g & 255] << len1) + s->bits[p1][b & 255];
157  for (r = -16; r < 16; r++) {
158  int len2 = s->len[2][r & 255];
159  if (len2 > limit1)
160  continue;
161  len[i] = len0 + len1 + len2;
162  bits[i] = (code << len2) + s->bits[2][r & 255];
163  if (s->decorrelate) {
164  map[i][G] = g;
165  map[i][B] = g + b;
166  map[i][R] = g + r;
167  } else {
168  map[i][B] = g;
169  map[i][G] = b;
170  map[i][R] = r;
171  }
172  i++;
173  }
174  }
175  }
176  ff_free_vlc(&s->vlc[3]);
177  if ((ret = init_vlc(&s->vlc[3], VLC_BITS, i, len, 1, 1,
178  bits, 2, 2, 0)) < 0)
179  return ret;
180  }
181  return 0;
182 }
183 
184 static int read_huffman_tables(HYuvContext *s, const uint8_t *src, int length)
185 {
186  GetBitContext gb;
187  int i, ret;
188 
189  if ((ret = init_get_bits(&gb, src, length * 8)) < 0)
190  return ret;
191 
192  for (i = 0; i < 3; i++) {
193  if ((ret = read_len_table(s->len[i], &gb)) < 0)
194  return ret;
195  if ((ret = ff_huffyuv_generate_bits_table(s->bits[i], s->len[i])) < 0)
196  return ret;
197  ff_free_vlc(&s->vlc[i]);
198  if ((ret = init_vlc(&s->vlc[i], VLC_BITS, 256, s->len[i], 1, 1,
199  s->bits[i], 4, 4, 0)) < 0)
200  return ret;
201  }
202 
203  if ((ret = generate_joint_tables(s)) < 0)
204  return ret;
205 
206  return (get_bits_count(&gb) + 7) / 8;
207 }
208 
210 {
211  GetBitContext gb;
212  int i, ret;
213 
214  if ((ret = init_get_bits(&gb, classic_shift_luma,
216  return ret;
217  if ((ret = read_len_table(s->len[0], &gb)) < 0)
218  return ret;
219 
220  if ((ret = init_get_bits(&gb, classic_shift_chroma,
222  return ret;
223  if ((ret = read_len_table(s->len[1], &gb)) < 0)
224  return ret;
225 
226  for(i=0; i<256; i++) s->bits[0][i] = classic_add_luma [i];
227  for(i=0; i<256; i++) s->bits[1][i] = classic_add_chroma[i];
228 
229  if (s->bitstream_bpp >= 24) {
230  memcpy(s->bits[1], s->bits[0], 256 * sizeof(uint32_t));
231  memcpy(s->len[1] , s->len [0], 256 * sizeof(uint8_t));
232  }
233  memcpy(s->bits[2], s->bits[1], 256 * sizeof(uint32_t));
234  memcpy(s->len[2] , s->len [1], 256 * sizeof(uint8_t));
235 
236  for (i = 0; i < 3; i++) {
237  ff_free_vlc(&s->vlc[i]);
238  if ((ret = init_vlc(&s->vlc[i], VLC_BITS, 256, s->len[i], 1, 1,
239  s->bits[i], 4, 4, 0)) < 0)
240  return ret;
241  }
242 
243  if ((ret = generate_joint_tables(s)) < 0)
244  return ret;
245 
246  return 0;
247 }
248 
250 {
251  HYuvContext *s = avctx->priv_data;
252  int ret;
253 
254  ff_huffyuv_common_init(avctx);
255  memset(s->vlc, 0, 3 * sizeof(VLC));
256 
257  s->interlaced = s->height > 288;
258 
259  s->bgr32 = 1;
260 
261  if (avctx->extradata_size) {
262  if ((avctx->bits_per_coded_sample & 7) &&
263  avctx->bits_per_coded_sample != 12)
264  s->version = 1; // do such files exist at all?
265  else
266  s->version = 2;
267  } else
268  s->version = 0;
269 
270  if (s->version == 2) {
271  int method, interlace;
272 
273  if (avctx->extradata_size < 4)
274  return -1;
275 
276  method = ((uint8_t*)avctx->extradata)[0];
277  s->decorrelate = method & 64 ? 1 : 0;
278  s->predictor = method & 63;
279  s->bitstream_bpp = ((uint8_t*)avctx->extradata)[1];
280  if (s->bitstream_bpp == 0)
281  s->bitstream_bpp = avctx->bits_per_coded_sample & ~7;
282  interlace = (((uint8_t*)avctx->extradata)[2] & 0x30) >> 4;
283  s->interlaced = (interlace == 1) ? 1 : (interlace == 2) ? 0 : s->interlaced;
284  s->context = ((uint8_t*)avctx->extradata)[2] & 0x40 ? 1 : 0;
285 
286  if ((ret = read_huffman_tables(s, ((uint8_t*)avctx->extradata) + 4,
287  avctx->extradata_size - 4)) < 0)
288  return ret;
289  }else{
290  switch (avctx->bits_per_coded_sample & 7) {
291  case 1:
292  s->predictor = LEFT;
293  s->decorrelate = 0;
294  break;
295  case 2:
296  s->predictor = LEFT;
297  s->decorrelate = 1;
298  break;
299  case 3:
300  s->predictor = PLANE;
301  s->decorrelate = avctx->bits_per_coded_sample >= 24;
302  break;
303  case 4:
304  s->predictor = MEDIAN;
305  s->decorrelate = 0;
306  break;
307  default:
308  s->predictor = LEFT; //OLD
309  s->decorrelate = 0;
310  break;
311  }
312  s->bitstream_bpp = avctx->bits_per_coded_sample & ~7;
313  s->context = 0;
314 
315  if ((ret = read_old_huffman_tables(s)) < 0)
316  return ret;
317  }
318 
319  switch (s->bitstream_bpp) {
320  case 12:
321  avctx->pix_fmt = AV_PIX_FMT_YUV420P;
322  break;
323  case 16:
324  if (s->yuy2) {
325  avctx->pix_fmt = AV_PIX_FMT_YUYV422;
326  } else {
327  avctx->pix_fmt = AV_PIX_FMT_YUV422P;
328  }
329  break;
330  case 24:
331  case 32:
332  if (s->bgr32) {
333  avctx->pix_fmt = AV_PIX_FMT_RGB32;
334  } else {
335  avctx->pix_fmt = AV_PIX_FMT_BGR24;
336  }
337  break;
338  default:
339  return AVERROR_INVALIDDATA;
340  }
341 
342  if (s->predictor == MEDIAN && avctx->pix_fmt == AV_PIX_FMT_YUV422P &&
343  avctx->width % 4) {
344  av_log(avctx, AV_LOG_ERROR, "width must be multiple of 4 "
345  "for this combination of colorspace and predictor type.\n");
346  return AVERROR_INVALIDDATA;
347  }
348 
349  if ((ret = ff_huffyuv_alloc_temp(s)) < 0)
350  return ret;
351 
352  return 0;
353 }
354 
356 {
357  HYuvContext *s = avctx->priv_data;
358  int i, ret;
359 
360  if ((ret = ff_huffyuv_alloc_temp(s)) < 0)
361  return ret;
362 
363  for (i = 0; i < 6; i++)
364  s->vlc[i].table = NULL;
365 
366  if (s->version == 2) {
367  if ((ret = read_huffman_tables(s, ((uint8_t*)avctx->extradata) + 4,
368  avctx->extradata_size)) < 0)
369  return ret;
370  } else {
371  if ((ret = read_old_huffman_tables(s)) < 0)
372  return ret;
373  }
374 
375  return 0;
376 }
377 
378 /* TODO instead of restarting the read when the code isn't in the first level
379  * of the joint table, jump into the 2nd level of the individual table. */
380 #define READ_2PIX(dst0, dst1, plane1){\
381  uint16_t code = get_vlc2(&s->gb, s->vlc[3+plane1].table, VLC_BITS, 1);\
382  if(code != 0xffff){\
383  dst0 = code>>8;\
384  dst1 = code;\
385  }else{\
386  dst0 = get_vlc2(&s->gb, s->vlc[0].table, VLC_BITS, 3);\
387  dst1 = get_vlc2(&s->gb, s->vlc[plane1].table, VLC_BITS, 3);\
388  }\
389 }
390 
391 static void decode_422_bitstream(HYuvContext *s, int count)
392 {
393  int i;
394 
395  count /= 2;
396 
397  if (count >= (get_bits_left(&s->gb)) / (31 * 4)) {
398  for (i = 0; i < count && get_bits_left(&s->gb) > 0; i++) {
399  READ_2PIX(s->temp[0][2 * i ], s->temp[1][i], 1);
400  READ_2PIX(s->temp[0][2 * i + 1], s->temp[2][i], 2);
401  }
402  } else {
403  for (i = 0; i < count; i++) {
404  READ_2PIX(s->temp[0][2 * i ], s->temp[1][i], 1);
405  READ_2PIX(s->temp[0][2 * i + 1], s->temp[2][i], 2);
406  }
407  }
408 }
409 
410 static void decode_gray_bitstream(HYuvContext *s, int count)
411 {
412  int i;
413 
414  count/=2;
415 
416  if (count >= (get_bits_left(&s->gb)) / (31 * 2)) {
417  for (i = 0; i < count && get_bits_left(&s->gb) > 0; i++) {
418  READ_2PIX(s->temp[0][2 * i], s->temp[0][2 * i + 1], 0);
419  }
420  } else {
421  for(i=0; i<count; i++){
422  READ_2PIX(s->temp[0][2 * i], s->temp[0][2 * i + 1], 0);
423  }
424  }
425 }
426 
427 static av_always_inline void decode_bgr_1(HYuvContext *s, int count,
428  int decorrelate, int alpha)
429 {
430  int i;
431  for (i = 0; i < count; i++) {
432  int code = get_vlc2(&s->gb, s->vlc[3].table, VLC_BITS, 1);
433  if (code != -1) {
434  *(uint32_t*)&s->temp[0][4 * i] = s->pix_bgr_map[code];
435  } else if(decorrelate) {
436  s->temp[0][4 * i + G] = get_vlc2(&s->gb, s->vlc[1].table, VLC_BITS, 3);
437  s->temp[0][4 * i + B] = get_vlc2(&s->gb, s->vlc[0].table, VLC_BITS, 3) +
438  s->temp[0][4 * i + G];
439  s->temp[0][4 * i + R] = get_vlc2(&s->gb, s->vlc[2].table, VLC_BITS, 3) +
440  s->temp[0][4 * i + G];
441  } else {
442  s->temp[0][4 * i + B] = get_vlc2(&s->gb, s->vlc[0].table, VLC_BITS, 3);
443  s->temp[0][4 * i + G] = get_vlc2(&s->gb, s->vlc[1].table, VLC_BITS, 3);
444  s->temp[0][4 * i + R] = get_vlc2(&s->gb, s->vlc[2].table, VLC_BITS, 3);
445  }
446  if (alpha)
447  s->temp[0][4 * i + A] = get_vlc2(&s->gb, s->vlc[2].table, VLC_BITS, 3);
448  }
449 }
450 
451 static void decode_bgr_bitstream(HYuvContext *s, int count)
452 {
453  if (s->decorrelate) {
454  if (s->bitstream_bpp==24)
455  decode_bgr_1(s, count, 1, 0);
456  else
457  decode_bgr_1(s, count, 1, 1);
458  } else {
459  if (s->bitstream_bpp==24)
460  decode_bgr_1(s, count, 0, 0);
461  else
462  decode_bgr_1(s, count, 0, 1);
463  }
464 }
465 
466 static void draw_slice(HYuvContext *s, AVFrame *frame, int y)
467 {
468  int h, cy, i;
469  int offset[AV_NUM_DATA_POINTERS];
470 
471  if (s->avctx->draw_horiz_band==NULL)
472  return;
473 
474  h = y - s->last_slice_end;
475  y -= h;
476 
477  if (s->bitstream_bpp == 12) {
478  cy = y>>1;
479  } else {
480  cy = y;
481  }
482 
483  offset[0] = frame->linesize[0] * y;
484  offset[1] = frame->linesize[1] * cy;
485  offset[2] = frame->linesize[2] * cy;
486  for (i = 3; i < AV_NUM_DATA_POINTERS; i++)
487  offset[i] = 0;
488  emms_c();
489 
490  s->avctx->draw_horiz_band(s->avctx, frame, offset, y, 3, h);
491 
492  s->last_slice_end = y + h;
493 }
494 
495 static int decode_frame(AVCodecContext *avctx, void *data, int *got_frame,
496  AVPacket *avpkt)
497 {
498  const uint8_t *buf = avpkt->data;
499  int buf_size = avpkt->size;
500  HYuvContext *s = avctx->priv_data;
501  const int width = s->width;
502  const int width2 = s->width>>1;
503  const int height = s->height;
504  int fake_ystride, fake_ustride, fake_vstride;
505  ThreadFrame frame = { .f = data };
506  AVFrame * const p = data;
507  int table_size = 0, ret;
508 
511  buf_size + FF_INPUT_BUFFER_PADDING_SIZE);
512  if (!s->bitstream_buffer)
513  return AVERROR(ENOMEM);
514 
515  memset(s->bitstream_buffer + buf_size, 0, FF_INPUT_BUFFER_PADDING_SIZE);
516  s->dsp.bswap_buf((uint32_t*)s->bitstream_buffer,
517  (const uint32_t*)buf, buf_size / 4);
518 
519  if ((ret = ff_thread_get_buffer(avctx, &frame, 0)) < 0) {
520  av_log(avctx, AV_LOG_ERROR, "get_buffer() failed\n");
521  return ret;
522  }
523 
524  if (s->context) {
525  table_size = read_huffman_tables(s, s->bitstream_buffer, buf_size);
526  if (table_size < 0)
527  return table_size;
528  }
529 
530  if ((unsigned)(buf_size-table_size) >= INT_MAX / 8)
531  return -1;
532 
533  if ((ret = init_get_bits(&s->gb, s->bitstream_buffer + table_size,
534  (buf_size - table_size) * 8)) < 0)
535  return ret;
536 
537  fake_ystride = s->interlaced ? p->linesize[0] * 2 : p->linesize[0];
538  fake_ustride = s->interlaced ? p->linesize[1] * 2 : p->linesize[1];
539  fake_vstride = s->interlaced ? p->linesize[2] * 2 : p->linesize[2];
540 
541  s->last_slice_end = 0;
542 
543  if (s->bitstream_bpp < 24) {
544  int y, cy;
545  int lefty, leftu, leftv;
546  int lefttopy, lefttopu, lefttopv;
547 
548  if (s->yuy2) {
549  p->data[0][3] = get_bits(&s->gb, 8);
550  p->data[0][2] = get_bits(&s->gb, 8);
551  p->data[0][1] = get_bits(&s->gb, 8);
552  p->data[0][0] = get_bits(&s->gb, 8);
553 
554  av_log(avctx, AV_LOG_ERROR,
555  "YUY2 output is not implemented yet\n");
556  return -1;
557  } else {
558 
559  leftv = p->data[2][0] = get_bits(&s->gb, 8);
560  lefty = p->data[0][1] = get_bits(&s->gb, 8);
561  leftu = p->data[1][0] = get_bits(&s->gb, 8);
562  p->data[0][0] = get_bits(&s->gb, 8);
563 
564  switch (s->predictor) {
565  case LEFT:
566  case PLANE:
567  decode_422_bitstream(s, width-2);
568  lefty = s->dsp.add_hfyu_left_prediction(p->data[0] + 2, s->temp[0], width-2, lefty);
569  if (!(s->flags&CODEC_FLAG_GRAY)) {
570  leftu = s->dsp.add_hfyu_left_prediction(p->data[1] + 1, s->temp[1], width2 - 1, leftu);
571  leftv = s->dsp.add_hfyu_left_prediction(p->data[2] + 1, s->temp[2], width2 - 1, leftv);
572  }
573 
574  for (cy = y = 1; y < s->height; y++, cy++) {
575  uint8_t *ydst, *udst, *vdst;
576 
577  if (s->bitstream_bpp == 12) {
578  decode_gray_bitstream(s, width);
579 
580  ydst = p->data[0] + p->linesize[0] * y;
581 
582  lefty = s->dsp.add_hfyu_left_prediction(ydst, s->temp[0], width, lefty);
583  if (s->predictor == PLANE) {
584  if (y > s->interlaced)
585  s->dsp.add_bytes(ydst, ydst - fake_ystride, width);
586  }
587  y++;
588  if (y >= s->height) break;
589  }
590 
591  draw_slice(s, p, y);
592 
593  ydst = p->data[0] + p->linesize[0]*y;
594  udst = p->data[1] + p->linesize[1]*cy;
595  vdst = p->data[2] + p->linesize[2]*cy;
596 
597  decode_422_bitstream(s, width);
598  lefty = s->dsp.add_hfyu_left_prediction(ydst, s->temp[0], width, lefty);
599  if (!(s->flags & CODEC_FLAG_GRAY)) {
600  leftu= s->dsp.add_hfyu_left_prediction(udst, s->temp[1], width2, leftu);
601  leftv= s->dsp.add_hfyu_left_prediction(vdst, s->temp[2], width2, leftv);
602  }
603  if (s->predictor == PLANE) {
604  if (cy > s->interlaced) {
605  s->dsp.add_bytes(ydst, ydst - fake_ystride, width);
606  if (!(s->flags & CODEC_FLAG_GRAY)) {
607  s->dsp.add_bytes(udst, udst - fake_ustride, width2);
608  s->dsp.add_bytes(vdst, vdst - fake_vstride, width2);
609  }
610  }
611  }
612  }
613  draw_slice(s, p, height);
614 
615  break;
616  case MEDIAN:
617  /* first line except first 2 pixels is left predicted */
618  decode_422_bitstream(s, width - 2);
619  lefty= s->dsp.add_hfyu_left_prediction(p->data[0] + 2, s->temp[0], width - 2, lefty);
620  if (!(s->flags & CODEC_FLAG_GRAY)) {
621  leftu = s->dsp.add_hfyu_left_prediction(p->data[1] + 1, s->temp[1], width2 - 1, leftu);
622  leftv = s->dsp.add_hfyu_left_prediction(p->data[2] + 1, s->temp[2], width2 - 1, leftv);
623  }
624 
625  cy = y = 1;
626 
627  /* second line is left predicted for interlaced case */
628  if (s->interlaced) {
629  decode_422_bitstream(s, width);
630  lefty = s->dsp.add_hfyu_left_prediction(p->data[0] + p->linesize[0], s->temp[0], width, lefty);
631  if (!(s->flags & CODEC_FLAG_GRAY)) {
632  leftu = s->dsp.add_hfyu_left_prediction(p->data[1] + p->linesize[2], s->temp[1], width2, leftu);
633  leftv = s->dsp.add_hfyu_left_prediction(p->data[2] + p->linesize[1], s->temp[2], width2, leftv);
634  }
635  y++; cy++;
636  }
637 
638  /* next 4 pixels are left predicted too */
639  decode_422_bitstream(s, 4);
640  lefty = s->dsp.add_hfyu_left_prediction(p->data[0] + fake_ystride, s->temp[0], 4, lefty);
641  if (!(s->flags&CODEC_FLAG_GRAY)) {
642  leftu = s->dsp.add_hfyu_left_prediction(p->data[1] + fake_ustride, s->temp[1], 2, leftu);
643  leftv = s->dsp.add_hfyu_left_prediction(p->data[2] + fake_vstride, s->temp[2], 2, leftv);
644  }
645 
646  /* next line except the first 4 pixels is median predicted */
647  lefttopy = p->data[0][3];
648  decode_422_bitstream(s, width - 4);
649  s->dsp.add_hfyu_median_prediction(p->data[0] + fake_ystride+4, p->data[0]+4, s->temp[0], width-4, &lefty, &lefttopy);
650  if (!(s->flags&CODEC_FLAG_GRAY)) {
651  lefttopu = p->data[1][1];
652  lefttopv = p->data[2][1];
653  s->dsp.add_hfyu_median_prediction(p->data[1] + fake_ustride+2, p->data[1] + 2, s->temp[1], width2 - 2, &leftu, &lefttopu);
654  s->dsp.add_hfyu_median_prediction(p->data[2] + fake_vstride+2, p->data[2] + 2, s->temp[2], width2 - 2, &leftv, &lefttopv);
655  }
656  y++; cy++;
657 
658  for (; y<height; y++, cy++) {
659  uint8_t *ydst, *udst, *vdst;
660 
661  if (s->bitstream_bpp == 12) {
662  while (2 * cy > y) {
663  decode_gray_bitstream(s, width);
664  ydst = p->data[0] + p->linesize[0] * y;
665  s->dsp.add_hfyu_median_prediction(ydst, ydst - fake_ystride, s->temp[0], width, &lefty, &lefttopy);
666  y++;
667  }
668  if (y >= height) break;
669  }
670  draw_slice(s, p, y);
671 
672  decode_422_bitstream(s, width);
673 
674  ydst = p->data[0] + p->linesize[0] * y;
675  udst = p->data[1] + p->linesize[1] * cy;
676  vdst = p->data[2] + p->linesize[2] * cy;
677 
678  s->dsp.add_hfyu_median_prediction(ydst, ydst - fake_ystride, s->temp[0], width, &lefty, &lefttopy);
679  if (!(s->flags & CODEC_FLAG_GRAY)) {
680  s->dsp.add_hfyu_median_prediction(udst, udst - fake_ustride, s->temp[1], width2, &leftu, &lefttopu);
681  s->dsp.add_hfyu_median_prediction(vdst, vdst - fake_vstride, s->temp[2], width2, &leftv, &lefttopv);
682  }
683  }
684 
685  draw_slice(s, p, height);
686  break;
687  }
688  }
689  } else {
690  int y;
691  int leftr, leftg, leftb, lefta;
692  const int last_line = (height - 1) * p->linesize[0];
693 
694  if (s->bitstream_bpp == 32) {
695  lefta = p->data[0][last_line+A] = get_bits(&s->gb, 8);
696  leftr = p->data[0][last_line+R] = get_bits(&s->gb, 8);
697  leftg = p->data[0][last_line+G] = get_bits(&s->gb, 8);
698  leftb = p->data[0][last_line+B] = get_bits(&s->gb, 8);
699  } else {
700  leftr = p->data[0][last_line+R] = get_bits(&s->gb, 8);
701  leftg = p->data[0][last_line+G] = get_bits(&s->gb, 8);
702  leftb = p->data[0][last_line+B] = get_bits(&s->gb, 8);
703  lefta = p->data[0][last_line+A] = 255;
704  skip_bits(&s->gb, 8);
705  }
706 
707  if (s->bgr32) {
708  switch (s->predictor) {
709  case LEFT:
710  case PLANE:
711  decode_bgr_bitstream(s, width - 1);
712  s->dsp.add_hfyu_left_prediction_bgr32(p->data[0] + last_line+4, s->temp[0], width - 1, &leftr, &leftg, &leftb, &lefta);
713 
714  for (y = s->height - 2; y >= 0; y--) { //Yes it is stored upside down.
715  decode_bgr_bitstream(s, width);
716 
717  s->dsp.add_hfyu_left_prediction_bgr32(p->data[0] + p->linesize[0]*y, s->temp[0], width, &leftr, &leftg, &leftb, &lefta);
718  if (s->predictor == PLANE) {
719  if (s->bitstream_bpp != 32) lefta = 0;
720  if ((y & s->interlaced) == 0 &&
721  y < s->height - 1 - s->interlaced) {
722  s->dsp.add_bytes(p->data[0] + p->linesize[0] * y,
723  p->data[0] + p->linesize[0] * y +
724  fake_ystride, fake_ystride);
725  }
726  }
727  }
728  // just 1 large slice as this is not possible in reverse order
729  draw_slice(s, p, height);
730  break;
731  default:
732  av_log(avctx, AV_LOG_ERROR,
733  "prediction type not supported!\n");
734  }
735  }else{
736  av_log(avctx, AV_LOG_ERROR,
737  "BGR24 output is not implemented yet\n");
738  return -1;
739  }
740  }
741  emms_c();
742 
743  *got_frame = 1;
744 
745  return (get_bits_count(&s->gb) + 31) / 32 * 4 + table_size;
746 }
747 
749 {
750  HYuvContext *s = avctx->priv_data;
751  int i;
752 
755 
756  for (i = 0; i < 6; i++) {
757  ff_free_vlc(&s->vlc[i]);
758  }
759 
760  return 0;
761 }
762 
763 #if CONFIG_HUFFYUV_DECODER
764 AVCodec ff_huffyuv_decoder = {
765  .name = "huffyuv",
766  .long_name = NULL_IF_CONFIG_SMALL("Huffyuv / HuffYUV"),
767  .type = AVMEDIA_TYPE_VIDEO,
768  .id = AV_CODEC_ID_HUFFYUV,
769  .priv_data_size = sizeof(HYuvContext),
770  .init = decode_init,
771  .close = decode_end,
772  .decode = decode_frame,
773  .capabilities = CODEC_CAP_DR1 | CODEC_CAP_DRAW_HORIZ_BAND |
776 };
777 #endif
778 
779 #if CONFIG_FFVHUFF_DECODER
780 AVCodec ff_ffvhuff_decoder = {
781  .name = "ffvhuff",
782  .long_name = NULL_IF_CONFIG_SMALL("Huffyuv FFmpeg variant"),
783  .type = AVMEDIA_TYPE_VIDEO,
784  .id = AV_CODEC_ID_FFVHUFF,
785  .priv_data_size = sizeof(HYuvContext),
786  .init = decode_init,
787  .close = decode_end,
788  .decode = decode_frame,
789  .capabilities = CODEC_CAP_DR1 | CODEC_CAP_DRAW_HORIZ_BAND |
792 };
793 #endif