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huffyuvdec.c
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1 /*
2  * huffyuv decoder
3  *
4  * Copyright (c) 2002-2014 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 FFmpeg.
10  *
11  * FFmpeg 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  * FFmpeg 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 FFmpeg; if not, write to the Free Software
23  * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
24  *
25  * yuva, gray, 4:4:4, 4:1:1, 4:1:0 and >8 bit per sample support sponsored by NOA
26  */
27 
28 /**
29  * @file
30  * huffyuv decoder
31  */
32 
33 #define UNCHECKED_BITSTREAM_READER 1
34 
35 #include "avcodec.h"
36 #include "get_bits.h"
37 #include "huffyuv.h"
38 #include "huffyuvdsp.h"
39 #include "thread.h"
40 #include "libavutil/pixdesc.h"
41 
42 #define classic_shift_luma_table_size 42
43 static const unsigned char classic_shift_luma[classic_shift_luma_table_size + FF_INPUT_BUFFER_PADDING_SIZE] = {
44  34, 36, 35, 69, 135, 232, 9, 16, 10, 24, 11, 23, 12, 16, 13, 10,
45  14, 8, 15, 8, 16, 8, 17, 20, 16, 10, 207, 206, 205, 236, 11, 8,
46  10, 21, 9, 23, 8, 8, 199, 70, 69, 68, 0,
47  0,0,0,0,0,0,0,0,
48 };
49 
50 #define classic_shift_chroma_table_size 59
51 static const unsigned char classic_shift_chroma[classic_shift_chroma_table_size + FF_INPUT_BUFFER_PADDING_SIZE] = {
52  66, 36, 37, 38, 39, 40, 41, 75, 76, 77, 110, 239, 144, 81, 82, 83,
53  84, 85, 118, 183, 56, 57, 88, 89, 56, 89, 154, 57, 58, 57, 26, 141,
54  57, 56, 58, 57, 58, 57, 184, 119, 214, 245, 116, 83, 82, 49, 80, 79,
55  78, 77, 44, 75, 41, 40, 39, 38, 37, 36, 34, 0,
56  0,0,0,0,0,0,0,0,
57 };
58 
59 static const unsigned char classic_add_luma[256] = {
60  3, 9, 5, 12, 10, 35, 32, 29, 27, 50, 48, 45, 44, 41, 39, 37,
61  73, 70, 68, 65, 64, 61, 58, 56, 53, 50, 49, 46, 44, 41, 38, 36,
62  68, 65, 63, 61, 58, 55, 53, 51, 48, 46, 45, 43, 41, 39, 38, 36,
63  35, 33, 32, 30, 29, 27, 26, 25, 48, 47, 46, 44, 43, 41, 40, 39,
64  37, 36, 35, 34, 32, 31, 30, 28, 27, 26, 24, 23, 22, 20, 19, 37,
65  35, 34, 33, 31, 30, 29, 27, 26, 24, 23, 21, 20, 18, 17, 15, 29,
66  27, 26, 24, 22, 21, 19, 17, 16, 14, 26, 25, 23, 21, 19, 18, 16,
67  15, 27, 25, 23, 21, 19, 17, 16, 14, 26, 25, 23, 21, 18, 17, 14,
68  12, 17, 19, 13, 4, 9, 2, 11, 1, 7, 8, 0, 16, 3, 14, 6,
69  12, 10, 5, 15, 18, 11, 10, 13, 15, 16, 19, 20, 22, 24, 27, 15,
70  18, 20, 22, 24, 26, 14, 17, 20, 22, 24, 27, 15, 18, 20, 23, 25,
71  28, 16, 19, 22, 25, 28, 32, 36, 21, 25, 29, 33, 38, 42, 45, 49,
72  28, 31, 34, 37, 40, 42, 44, 47, 49, 50, 52, 54, 56, 57, 59, 60,
73  62, 64, 66, 67, 69, 35, 37, 39, 40, 42, 43, 45, 47, 48, 51, 52,
74  54, 55, 57, 59, 60, 62, 63, 66, 67, 69, 71, 72, 38, 40, 42, 43,
75  46, 47, 49, 51, 26, 28, 30, 31, 33, 34, 18, 19, 11, 13, 7, 8,
76 };
77 
78 static const unsigned char classic_add_chroma[256] = {
79  3, 1, 2, 2, 2, 2, 3, 3, 7, 5, 7, 5, 8, 6, 11, 9,
80  7, 13, 11, 10, 9, 8, 7, 5, 9, 7, 6, 4, 7, 5, 8, 7,
81  11, 8, 13, 11, 19, 15, 22, 23, 20, 33, 32, 28, 27, 29, 51, 77,
82  43, 45, 76, 81, 46, 82, 75, 55, 56, 144, 58, 80, 60, 74, 147, 63,
83  143, 65, 66, 67, 68, 69, 70, 71, 72, 73, 74, 75, 76, 77, 78, 79,
84  80, 81, 82, 83, 84, 85, 86, 87, 88, 89, 90, 91, 27, 30, 21, 22,
85  17, 14, 5, 6, 100, 54, 47, 50, 51, 53, 106, 107, 108, 109, 110, 111,
86  112, 113, 114, 115, 4, 117, 118, 92, 94, 121, 122, 3, 124, 103, 2, 1,
87  0, 129, 130, 131, 120, 119, 126, 125, 136, 137, 138, 139, 140, 141, 142, 134,
88  135, 132, 133, 104, 64, 101, 62, 57, 102, 95, 93, 59, 61, 28, 97, 96,
89  52, 49, 48, 29, 32, 25, 24, 46, 23, 98, 45, 44, 43, 20, 42, 41,
90  19, 18, 99, 40, 15, 39, 38, 16, 13, 12, 11, 37, 10, 9, 8, 36,
91  7, 128, 127, 105, 123, 116, 35, 34, 33, 145, 31, 79, 42, 146, 78, 26,
92  83, 48, 49, 50, 44, 47, 26, 31, 30, 18, 17, 19, 21, 24, 25, 13,
93  14, 16, 17, 18, 20, 21, 12, 14, 15, 9, 10, 6, 9, 6, 5, 8,
94  6, 12, 8, 10, 7, 9, 6, 4, 6, 2, 2, 3, 3, 3, 3, 2,
95 };
96 
97 static int read_len_table(uint8_t *dst, GetBitContext *gb, int n)
98 {
99  int i, val, repeat;
100 
101  for (i = 0; i < n;) {
102  repeat = get_bits(gb, 3);
103  val = get_bits(gb, 5);
104  if (repeat == 0)
105  repeat = get_bits(gb, 8);
106  if (i + repeat > n || get_bits_left(gb) < 0) {
107  av_log(NULL, AV_LOG_ERROR, "Error reading huffman table\n");
108  return AVERROR_INVALIDDATA;
109  }
110  while (repeat--)
111  dst[i++] = val;
112  }
113  return 0;
114 }
115 
116 static int generate_joint_tables(HYuvContext *s)
117 {
118  int ret;
119  uint16_t *symbols = av_mallocz(5 << VLC_BITS);
120  uint16_t *bits;
121  uint8_t *len;
122  if (!symbols)
123  return AVERROR(ENOMEM);
124  bits = symbols + (1 << VLC_BITS);
125  len = (uint8_t *)(bits + (1 << VLC_BITS));
126 
127  if (s->bitstream_bpp < 24 || s->version > 2) {
128  int p, i, y, u;
129  for (p = 0; p < 4; p++) {
130  int p0 = s->version > 2 ? p : 0;
131  for (i = y = 0; y < s->vlc_n; y++) {
132  int len0 = s->len[p0][y];
133  int limit = VLC_BITS - len0;
134  if (limit <= 0 || !len0)
135  continue;
136  if ((sign_extend(y, 8) & (s->vlc_n-1)) != y)
137  continue;
138  for (u = 0; u < s->vlc_n; u++) {
139  int len1 = s->len[p][u];
140  if (len1 > limit || !len1)
141  continue;
142  if ((sign_extend(u, 8) & (s->vlc_n-1)) != u)
143  continue;
144  av_assert0(i < (1 << VLC_BITS));
145  len[i] = len0 + len1;
146  bits[i] = (s->bits[p0][y] << len1) + s->bits[p][u];
147  symbols[i] = (y << 8) + (u & 0xFF);
148  i++;
149  }
150  }
151  ff_free_vlc(&s->vlc[4 + p]);
152  if ((ret = ff_init_vlc_sparse(&s->vlc[4 + p], VLC_BITS, i, len, 1, 1,
153  bits, 2, 2, symbols, 2, 2, 0)) < 0)
154  goto out;
155  }
156  } else {
157  uint8_t (*map)[4] = (uint8_t(*)[4]) s->pix_bgr_map;
158  int i, b, g, r, code;
159  int p0 = s->decorrelate;
160  int p1 = !s->decorrelate;
161  /* Restrict the range to +/-16 because that's pretty much guaranteed
162  * to cover all the combinations that fit in 11 bits total, and it
163  * does not matter if we miss a few rare codes. */
164  for (i = 0, g = -16; g < 16; g++) {
165  int len0 = s->len[p0][g & 255];
166  int limit0 = VLC_BITS - len0;
167  if (limit0 < 2 || !len0)
168  continue;
169  for (b = -16; b < 16; b++) {
170  int len1 = s->len[p1][b & 255];
171  int limit1 = limit0 - len1;
172  if (limit1 < 1 || !len1)
173  continue;
174  code = (s->bits[p0][g & 255] << len1) + s->bits[p1][b & 255];
175  for (r = -16; r < 16; r++) {
176  int len2 = s->len[2][r & 255];
177  if (len2 > limit1 || !len2)
178  continue;
179  av_assert0(i < (1 << VLC_BITS));
180  len[i] = len0 + len1 + len2;
181  bits[i] = (code << len2) + s->bits[2][r & 255];
182  if (s->decorrelate) {
183  map[i][G] = g;
184  map[i][B] = g + b;
185  map[i][R] = g + r;
186  } else {
187  map[i][B] = g;
188  map[i][G] = b;
189  map[i][R] = r;
190  }
191  i++;
192  }
193  }
194  }
195  ff_free_vlc(&s->vlc[4]);
196  if ((ret = init_vlc(&s->vlc[4], VLC_BITS, i, len, 1, 1,
197  bits, 2, 2, 0)) < 0)
198  goto out;
199  }
200  ret = 0;
201 out:
202  av_freep(&symbols);
203  return ret;
204 }
205 
206 static int read_huffman_tables(HYuvContext *s, const uint8_t *src, int length)
207 {
208  GetBitContext gb;
209  int i, ret;
210  int count = 3;
211 
212  if ((ret = init_get_bits(&gb, src, length * 8)) < 0)
213  return ret;
214 
215  if (s->version > 2)
216  count = 1 + s->alpha + 2*s->chroma;
217 
218  for (i = 0; i < count; i++) {
219  if ((ret = read_len_table(s->len[i], &gb, s->vlc_n)) < 0)
220  return ret;
221  if ((ret = ff_huffyuv_generate_bits_table(s->bits[i], s->len[i], s->vlc_n)) < 0)
222  return ret;
223  ff_free_vlc(&s->vlc[i]);
224  if ((ret = init_vlc(&s->vlc[i], VLC_BITS, s->vlc_n, s->len[i], 1, 1,
225  s->bits[i], 4, 4, 0)) < 0)
226  return ret;
227  }
228 
229  if ((ret = generate_joint_tables(s)) < 0)
230  return ret;
231 
232  return (get_bits_count(&gb) + 7) / 8;
233 }
234 
235 static int read_old_huffman_tables(HYuvContext *s)
236 {
237  GetBitContext gb;
238  int i, ret;
239 
240  init_get_bits(&gb, classic_shift_luma,
241  classic_shift_luma_table_size * 8);
242  if ((ret = read_len_table(s->len[0], &gb, 256)) < 0)
243  return ret;
244 
245  init_get_bits(&gb, classic_shift_chroma,
246  classic_shift_chroma_table_size * 8);
247  if ((ret = read_len_table(s->len[1], &gb, 256)) < 0)
248  return ret;
249 
250  for (i = 0; i < 256; i++)
251  s->bits[0][i] = classic_add_luma[i];
252  for (i = 0; i < 256; i++)
253  s->bits[1][i] = classic_add_chroma[i];
254 
255  if (s->bitstream_bpp >= 24) {
256  memcpy(s->bits[1], s->bits[0], 256 * sizeof(uint32_t));
257  memcpy(s->len[1], s->len[0], 256 * sizeof(uint8_t));
258  }
259  memcpy(s->bits[2], s->bits[1], 256 * sizeof(uint32_t));
260  memcpy(s->len[2], s->len[1], 256 * sizeof(uint8_t));
261 
262  for (i = 0; i < 4; i++) {
263  ff_free_vlc(&s->vlc[i]);
264  if ((ret = init_vlc(&s->vlc[i], VLC_BITS, 256, s->len[i], 1, 1,
265  s->bits[i], 4, 4, 0)) < 0)
266  return ret;
267  }
268 
269  if ((ret = generate_joint_tables(s)) < 0)
270  return ret;
271 
272  return 0;
273 }
274 
275 static av_cold int decode_end(AVCodecContext *avctx)
276 {
277  HYuvContext *s = avctx->priv_data;
278  int i;
279 
280  ff_huffyuv_common_end(s);
281  av_freep(&s->bitstream_buffer);
282 
283  for (i = 0; i < 8; i++)
284  ff_free_vlc(&s->vlc[i]);
285 
286  return 0;
287 }
288 
289 static av_cold int decode_init(AVCodecContext *avctx)
290 {
291  HYuvContext *s = avctx->priv_data;
292  int ret;
293 
294  ff_huffyuvdsp_init(&s->hdsp);
295  memset(s->vlc, 0, 4 * sizeof(VLC));
296 
297  s->interlaced = avctx->height > 288;
298  s->bgr32 = 1;
299 
300  if (avctx->extradata_size) {
301  if ((avctx->bits_per_coded_sample & 7) &&
302  avctx->bits_per_coded_sample != 12)
303  s->version = 1; // do such files exist at all?
304  else if (avctx->extradata_size > 3 && avctx->extradata[3] == 0)
305  s->version = 2;
306  else
307  s->version = 3;
308  } else
309  s->version = 0;
310 
311  s->bps = 8;
312  s->n = 1<<s->bps;
313  s->vlc_n = FFMIN(s->n, MAX_VLC_N);
314  s->chroma = 1;
315  if (s->version >= 2) {
316  int method, interlace;
317 
318  if (avctx->extradata_size < 4)
319  return AVERROR_INVALIDDATA;
320 
321  method = avctx->extradata[0];
322  s->decorrelate = method & 64 ? 1 : 0;
323  s->predictor = method & 63;
324  if (s->version == 2) {
325  s->bitstream_bpp = avctx->extradata[1];
326  if (s->bitstream_bpp == 0)
327  s->bitstream_bpp = avctx->bits_per_coded_sample & ~7;
328  } else {
329  s->bps = (avctx->extradata[1] >> 4) + 1;
330  s->n = 1<<s->bps;
331  s->vlc_n = FFMIN(s->n, MAX_VLC_N);
332  s->chroma_h_shift = avctx->extradata[1] & 3;
333  s->chroma_v_shift = (avctx->extradata[1] >> 2) & 3;
334  s->yuv = !!(avctx->extradata[2] & 1);
335  s->chroma= !!(avctx->extradata[2] & 3);
336  s->alpha = !!(avctx->extradata[2] & 4);
337  }
338  interlace = (avctx->extradata[2] & 0x30) >> 4;
339  s->interlaced = (interlace == 1) ? 1 : (interlace == 2) ? 0 : s->interlaced;
340  s->context = avctx->extradata[2] & 0x40 ? 1 : 0;
341 
342  if ((ret = read_huffman_tables(s, avctx->extradata + 4,
343  avctx->extradata_size - 4)) < 0)
344  goto error;
345  } else {
346  switch (avctx->bits_per_coded_sample & 7) {
347  case 1:
348  s->predictor = LEFT;
349  s->decorrelate = 0;
350  break;
351  case 2:
352  s->predictor = LEFT;
353  s->decorrelate = 1;
354  break;
355  case 3:
356  s->predictor = PLANE;
357  s->decorrelate = avctx->bits_per_coded_sample >= 24;
358  break;
359  case 4:
360  s->predictor = MEDIAN;
361  s->decorrelate = 0;
362  break;
363  default:
364  s->predictor = LEFT; // OLD
365  s->decorrelate = 0;
366  break;
367  }
368  s->bitstream_bpp = avctx->bits_per_coded_sample & ~7;
369  s->context = 0;
370 
371  if ((ret = read_old_huffman_tables(s)) < 0)
372  goto error;
373  }
374 
375  if (s->version <= 2) {
376  switch (s->bitstream_bpp) {
377  case 12:
378  avctx->pix_fmt = AV_PIX_FMT_YUV420P;
379  s->yuv = 1;
380  break;
381  case 16:
382  if (s->yuy2)
383  avctx->pix_fmt = AV_PIX_FMT_YUYV422;
384  else
385  avctx->pix_fmt = AV_PIX_FMT_YUV422P;
386  s->yuv = 1;
387  break;
388  case 24:
389  if (s->bgr32)
390  avctx->pix_fmt = AV_PIX_FMT_0RGB32;
391  else
392  avctx->pix_fmt = AV_PIX_FMT_BGR24;
393  break;
394  case 32:
395  av_assert0(s->bgr32);
396  avctx->pix_fmt = AV_PIX_FMT_RGB32;
397  s->alpha = 1;
398  break;
399  default:
400  ret = AVERROR_INVALIDDATA;
401  goto error;
402  }
403  av_pix_fmt_get_chroma_sub_sample(avctx->pix_fmt,
404  &s->chroma_h_shift,
405  &s->chroma_v_shift);
406  } else {
407  switch ( (s->chroma<<10) | (s->yuv<<9) | (s->alpha<<8) | ((s->bps-1)<<4) | s->chroma_h_shift | (s->chroma_v_shift<<2)) {
408  case 0x070:
409  avctx->pix_fmt = AV_PIX_FMT_GRAY8;
410  break;
411  case 0x0F0:
412  avctx->pix_fmt = AV_PIX_FMT_GRAY16;
413  break;
414  case 0x170:
415  avctx->pix_fmt = AV_PIX_FMT_GRAY8A;
416  break;
417  case 0x470:
418  avctx->pix_fmt = AV_PIX_FMT_GBRP;
419  break;
420  case 0x480:
421  avctx->pix_fmt = AV_PIX_FMT_GBRP9;
422  break;
423  case 0x490:
424  avctx->pix_fmt = AV_PIX_FMT_GBRP10;
425  break;
426  case 0x4B0:
427  avctx->pix_fmt = AV_PIX_FMT_GBRP12;
428  break;
429  case 0x4D0:
430  avctx->pix_fmt = AV_PIX_FMT_GBRP14;
431  break;
432  case 0x4F0:
433  avctx->pix_fmt = AV_PIX_FMT_GBRP16;
434  break;
435  case 0x570:
436  avctx->pix_fmt = AV_PIX_FMT_GBRAP;
437  break;
438  case 0x670:
439  avctx->pix_fmt = AV_PIX_FMT_YUV444P;
440  break;
441  case 0x680:
442  avctx->pix_fmt = AV_PIX_FMT_YUV444P9;
443  break;
444  case 0x690:
445  avctx->pix_fmt = AV_PIX_FMT_YUV444P10;
446  break;
447  case 0x6B0:
448  avctx->pix_fmt = AV_PIX_FMT_YUV444P12;
449  break;
450  case 0x6D0:
451  avctx->pix_fmt = AV_PIX_FMT_YUV444P14;
452  break;
453  case 0x6F0:
454  avctx->pix_fmt = AV_PIX_FMT_YUV444P16;
455  break;
456  case 0x671:
457  avctx->pix_fmt = AV_PIX_FMT_YUV422P;
458  break;
459  case 0x681:
460  avctx->pix_fmt = AV_PIX_FMT_YUV422P9;
461  break;
462  case 0x691:
463  avctx->pix_fmt = AV_PIX_FMT_YUV422P10;
464  break;
465  case 0x6B1:
466  avctx->pix_fmt = AV_PIX_FMT_YUV422P12;
467  break;
468  case 0x6D1:
469  avctx->pix_fmt = AV_PIX_FMT_YUV422P14;
470  break;
471  case 0x6F1:
472  avctx->pix_fmt = AV_PIX_FMT_YUV422P16;
473  break;
474  case 0x672:
475  avctx->pix_fmt = AV_PIX_FMT_YUV411P;
476  break;
477  case 0x674:
478  avctx->pix_fmt = AV_PIX_FMT_YUV440P;
479  break;
480  case 0x675:
481  avctx->pix_fmt = AV_PIX_FMT_YUV420P;
482  break;
483  case 0x685:
484  avctx->pix_fmt = AV_PIX_FMT_YUV420P9;
485  break;
486  case 0x695:
487  avctx->pix_fmt = AV_PIX_FMT_YUV420P10;
488  break;
489  case 0x6B5:
490  avctx->pix_fmt = AV_PIX_FMT_YUV420P12;
491  break;
492  case 0x6D5:
493  avctx->pix_fmt = AV_PIX_FMT_YUV420P14;
494  break;
495  case 0x6F5:
496  avctx->pix_fmt = AV_PIX_FMT_YUV420P16;
497  break;
498  case 0x67A:
499  avctx->pix_fmt = AV_PIX_FMT_YUV410P;
500  break;
501  case 0x770:
502  avctx->pix_fmt = AV_PIX_FMT_YUVA444P;
503  break;
504  case 0x780:
505  avctx->pix_fmt = AV_PIX_FMT_YUVA444P9;
506  break;
507  case 0x790:
508  avctx->pix_fmt = AV_PIX_FMT_YUVA444P10;
509  break;
510  case 0x7F0:
511  avctx->pix_fmt = AV_PIX_FMT_YUVA444P16;
512  break;
513  case 0x771:
514  avctx->pix_fmt = AV_PIX_FMT_YUVA422P;
515  break;
516  case 0x781:
517  avctx->pix_fmt = AV_PIX_FMT_YUVA422P9;
518  break;
519  case 0x791:
520  avctx->pix_fmt = AV_PIX_FMT_YUVA422P10;
521  break;
522  case 0x7F1:
523  avctx->pix_fmt = AV_PIX_FMT_YUVA422P16;
524  break;
525  case 0x775:
526  avctx->pix_fmt = AV_PIX_FMT_YUVA420P;
527  break;
528  case 0x785:
529  avctx->pix_fmt = AV_PIX_FMT_YUVA420P9;
530  break;
531  case 0x795:
532  avctx->pix_fmt = AV_PIX_FMT_YUVA420P10;
533  break;
534  case 0x7F5:
535  avctx->pix_fmt = AV_PIX_FMT_YUVA420P16;
536  break;
537  default:
538  ret = AVERROR_INVALIDDATA;
539  goto error;
540  }
541  }
542 
543  ff_huffyuv_common_init(avctx);
544 
545  if ((avctx->pix_fmt == AV_PIX_FMT_YUV422P || avctx->pix_fmt == AV_PIX_FMT_YUV420P) && avctx->width & 1) {
546  av_log(avctx, AV_LOG_ERROR, "width must be even for this colorspace\n");
547  ret = AVERROR_INVALIDDATA;
548  goto error;
549  }
550  if (s->predictor == MEDIAN && avctx->pix_fmt == AV_PIX_FMT_YUV422P &&
551  avctx->width % 4) {
552  av_log(avctx, AV_LOG_ERROR, "width must be a multiple of 4 "
553  "for this combination of colorspace and predictor type.\n");
554  ret = AVERROR_INVALIDDATA;
555  goto error;
556  }
557 
558  if ((ret = ff_huffyuv_alloc_temp(s)) < 0) {
559  ff_huffyuv_common_end(s);
560  goto error;
561  }
562 
563  return 0;
564  error:
565  decode_end(avctx);
566  return ret;
567 }
568 
569 static av_cold int decode_init_thread_copy(AVCodecContext *avctx)
570 {
571  HYuvContext *s = avctx->priv_data;
572  int i, ret;
573 
574  if ((ret = ff_huffyuv_alloc_temp(s)) < 0) {
575  ff_huffyuv_common_end(s);
576  return ret;
577  }
578 
579  for (i = 0; i < 8; i++)
580  s->vlc[i].table = NULL;
581 
582  if (s->version >= 2) {
583  if ((ret = read_huffman_tables(s, avctx->extradata + 4,
584  avctx->extradata_size)) < 0)
585  return ret;
586  } else {
587  if ((ret = read_old_huffman_tables(s)) < 0)
588  return ret;
589  }
590 
591  return 0;
592 }
593 
594 /** Subset of GET_VLC for use in hand-roller VLC code */
595 #define VLC_INTERN(dst, table, gb, name, bits, max_depth) \
596  code = table[index][0]; \
597  n = table[index][1]; \
598  if (max_depth > 1 && n < 0) { \
599  LAST_SKIP_BITS(name, gb, bits); \
600  UPDATE_CACHE(name, gb); \
601  \
602  nb_bits = -n; \
603  index = SHOW_UBITS(name, gb, nb_bits) + code; \
604  code = table[index][0]; \
605  n = table[index][1]; \
606  if (max_depth > 2 && n < 0) { \
607  LAST_SKIP_BITS(name, gb, nb_bits); \
608  UPDATE_CACHE(name, gb); \
609  \
610  nb_bits = -n; \
611  index = SHOW_UBITS(name, gb, nb_bits) + code; \
612  code = table[index][0]; \
613  n = table[index][1]; \
614  } \
615  } \
616  dst = code; \
617  LAST_SKIP_BITS(name, gb, n)
618 
619 
620 #define GET_VLC_DUAL(dst0, dst1, name, gb, dtable, table1, table2, \
621  bits, max_depth, OP) \
622  do { \
623  unsigned int index = SHOW_UBITS(name, gb, bits); \
624  int code, n = dtable[index][1]; \
625  \
626  if (n<=0) { \
627  int nb_bits; \
628  VLC_INTERN(dst0, table1, gb, name, bits, max_depth); \
629  \
630  UPDATE_CACHE(re, gb); \
631  index = SHOW_UBITS(name, gb, bits); \
632  VLC_INTERN(dst1, table2, gb, name, bits, max_depth); \
633  } else { \
634  code = dtable[index][0]; \
635  OP(dst0, dst1, code); \
636  LAST_SKIP_BITS(name, gb, n); \
637  } \
638  } while (0)
639 
640 #define OP8bits(dst0, dst1, code) dst0 = code>>8; dst1 = code
641 
642 #define READ_2PIX(dst0, dst1, plane1) \
643  UPDATE_CACHE(re, &s->gb); \
644  GET_VLC_DUAL(dst0, dst1, re, &s->gb, s->vlc[4+plane1].table, \
645  s->vlc[0].table, s->vlc[plane1].table, VLC_BITS, 3, OP8bits)
646 
647 static void decode_422_bitstream(HYuvContext *s, int count)
648 {
649  int i, icount;
650  OPEN_READER(re, &s->gb);
651  count /= 2;
652 
653  icount = get_bits_left(&s->gb) / (32 * 4);
654  if (count >= icount) {
655  for (i = 0; i < icount; i++) {
656  READ_2PIX(s->temp[0][2 * i], s->temp[1][i], 1);
657  READ_2PIX(s->temp[0][2 * i + 1], s->temp[2][i], 2);
658  }
659  for (; i < count && BITS_LEFT(re, &s->gb) > 0; i++) {
660  READ_2PIX(s->temp[0][2 * i ], s->temp[1][i], 1);
661  if (BITS_LEFT(re, &s->gb) <= 0) break;
662  READ_2PIX(s->temp[0][2 * i + 1], s->temp[2][i], 2);
663  }
664  for (; i < count; i++)
665  s->temp[0][2 * i ] = s->temp[1][i] =
666  s->temp[0][2 * i + 1] = s->temp[2][i] = 0;
667  } else {
668  for (i = 0; i < count; i++) {
669  READ_2PIX(s->temp[0][2 * i], s->temp[1][i], 1);
670  READ_2PIX(s->temp[0][2 * i + 1], s->temp[2][i], 2);
671  }
672  }
673  CLOSE_READER(re, &s->gb);
674 }
675 
676 #define READ_2PIX_PLANE(dst0, dst1, plane, OP) \
677  UPDATE_CACHE(re, &s->gb); \
678  GET_VLC_DUAL(dst0, dst1, re, &s->gb, s->vlc[4+plane].table, \
679  s->vlc[plane].table, s->vlc[plane].table, VLC_BITS, 3, OP)
680 
681 #define OP14bits(dst0, dst1, code) dst0 = code>>8; dst1 = sign_extend(code, 8)
682 
683 /* TODO instead of restarting the read when the code isn't in the first level
684  * of the joint table, jump into the 2nd level of the individual table. */
685 #define READ_2PIX_PLANE16(dst0, dst1, plane){\
686  dst0 = get_vlc2(&s->gb, s->vlc[plane].table, VLC_BITS, 3)<<2;\
687  dst0 += get_bits(&s->gb, 2);\
688  dst1 = get_vlc2(&s->gb, s->vlc[plane].table, VLC_BITS, 3)<<2;\
689  dst1 += get_bits(&s->gb, 2);\
690 }
691 static void decode_plane_bitstream(HYuvContext *s, int width, int plane)
692 {
693  int i, count = width/2;
694 
695  if (s->bps <= 8) {
696  OPEN_READER(re, &s->gb);
697  if (count >= (get_bits_left(&s->gb)) / (32 * 2)) {
698  for (i = 0; i < count && BITS_LEFT(re, &s->gb) > 0; i++) {
699  READ_2PIX_PLANE(s->temp[0][2 * i], s->temp[0][2 * i + 1], plane, OP8bits);
700  }
701  } else {
702  for(i=0; i<count; i++){
703  READ_2PIX_PLANE(s->temp[0][2 * i], s->temp[0][2 * i + 1], plane, OP8bits);
704  }
705  }
706  if( width&1 && BITS_LEFT(re, &s->gb)>0 ) {
707  unsigned int index;
708  int nb_bits, code, n;
709  UPDATE_CACHE(re, &s->gb);
710  index = SHOW_UBITS(re, &s->gb, VLC_BITS);
711  VLC_INTERN(s->temp[0][width-1], s->vlc[plane].table,
712  &s->gb, re, VLC_BITS, 3);
713  }
714  CLOSE_READER(re, &s->gb);
715  } else if (s->bps <= 14) {
716  OPEN_READER(re, &s->gb);
717  if (count >= (get_bits_left(&s->gb)) / (32 * 2)) {
718  for (i = 0; i < count && BITS_LEFT(re, &s->gb) > 0; i++) {
719  READ_2PIX_PLANE(s->temp16[0][2 * i], s->temp16[0][2 * i + 1], plane, OP14bits);
720  }
721  } else {
722  for(i=0; i<count; i++){
723  READ_2PIX_PLANE(s->temp16[0][2 * i], s->temp16[0][2 * i + 1], plane, OP14bits);
724  }
725  }
726  if( width&1 && BITS_LEFT(re, &s->gb)>0 ) {
727  unsigned int index;
728  int nb_bits, code, n;
729  UPDATE_CACHE(re, &s->gb);
730  index = SHOW_UBITS(re, &s->gb, VLC_BITS);
731  VLC_INTERN(s->temp16[0][width-1], s->vlc[plane].table,
732  &s->gb, re, VLC_BITS, 3);
733  }
734  CLOSE_READER(re, &s->gb);
735  } else {
736  if (count >= (get_bits_left(&s->gb)) / (32 * 2)) {
737  for (i = 0; i < count && get_bits_left(&s->gb) > 0; i++) {
738  READ_2PIX_PLANE16(s->temp16[0][2 * i], s->temp16[0][2 * i + 1], plane);
739  }
740  } else {
741  for(i=0; i<count; i++){
742  READ_2PIX_PLANE16(s->temp16[0][2 * i], s->temp16[0][2 * i + 1], plane);
743  }
744  }
745  if( width&1 && get_bits_left(&s->gb)>0 ) {
746  int dst = get_vlc2(&s->gb, s->vlc[plane].table, VLC_BITS, 3)<<2;
747  s->temp16[0][width-1] = dst + get_bits(&s->gb, 2);
748  }
749  }
750 }
751 
752 static void decode_gray_bitstream(HYuvContext *s, int count)
753 {
754  int i;
755  OPEN_READER(re, &s->gb);
756  count /= 2;
757 
758  if (count >= (get_bits_left(&s->gb)) / (32 * 2)) {
759  for (i = 0; i < count && BITS_LEFT(re, &s->gb) > 0; i++) {
760  READ_2PIX(s->temp[0][2 * i], s->temp[0][2 * i + 1], 0);
761  }
762  } else {
763  for (i = 0; i < count; i++) {
764  READ_2PIX(s->temp[0][2 * i], s->temp[0][2 * i + 1], 0);
765  }
766  }
767  CLOSE_READER(re, &s->gb);
768 }
769 
770 static av_always_inline void decode_bgr_1(HYuvContext *s, int count,
771  int decorrelate, int alpha)
772 {
773  int i;
774  OPEN_READER(re, &s->gb);
775 
776  for (i = 0; i < count && BITS_LEFT(re, &s->gb) > 0; i++) {
777  unsigned int index;
778  int code, n, nb_bits;
779 
780  UPDATE_CACHE(re, &s->gb);
781  index = SHOW_UBITS(re, &s->gb, VLC_BITS);
782  n = s->vlc[4].table[index][1];
783 
784  if (n>0) {
785  code = s->vlc[4].table[index][0];
786  *(uint32_t *) &s->temp[0][4 * i] = s->pix_bgr_map[code];
787  LAST_SKIP_BITS(re, &s->gb, n);
788  } else {
789  if (decorrelate) {
790  VLC_INTERN(s->temp[0][4 * i + G], s->vlc[1].table,
791  &s->gb, re, VLC_BITS, 3);
792 
793  UPDATE_CACHE(re, &s->gb);
794  index = SHOW_UBITS(re, &s->gb, VLC_BITS);
795  VLC_INTERN(code, s->vlc[0].table, &s->gb, re, VLC_BITS, 3);
796  s->temp[0][4 * i + B] = code + s->temp[0][4 * i + G];
797 
798  UPDATE_CACHE(re, &s->gb);
799  index = SHOW_UBITS(re, &s->gb, VLC_BITS);
800  VLC_INTERN(code, s->vlc[2].table, &s->gb, re, VLC_BITS, 3);
801  s->temp[0][4 * i + R] = code + s->temp[0][4 * i + G];
802  } else {
803  VLC_INTERN(s->temp[0][4 * i + B], s->vlc[0].table,
804  &s->gb, re, VLC_BITS, 3);
805 
806  UPDATE_CACHE(re, &s->gb);
807  index = SHOW_UBITS(re, &s->gb, VLC_BITS);
808  VLC_INTERN(s->temp[0][4 * i + G], s->vlc[1].table,
809  &s->gb, re, VLC_BITS, 3);
810 
811  UPDATE_CACHE(re, &s->gb);
812  index = SHOW_UBITS(re, &s->gb, VLC_BITS);
813  VLC_INTERN(s->temp[0][4 * i + R], s->vlc[2].table,
814  &s->gb, re, VLC_BITS, 3);
815  }
816  }
817  if (alpha) {
818  UPDATE_CACHE(re, &s->gb);
819  index = SHOW_UBITS(re, &s->gb, VLC_BITS);
820  VLC_INTERN(s->temp[0][4 * i + A], s->vlc[2].table,
821  &s->gb, re, VLC_BITS, 3);
822  } else
823  s->temp[0][4 * i + A] = 0;
824  }
825  CLOSE_READER(re, &s->gb);
826 }
827 
828 static void decode_bgr_bitstream(HYuvContext *s, int count)
829 {
830  if (s->decorrelate) {
831  if (s->bitstream_bpp == 24)
832  decode_bgr_1(s, count, 1, 0);
833  else
834  decode_bgr_1(s, count, 1, 1);
835  } else {
836  if (s->bitstream_bpp == 24)
837  decode_bgr_1(s, count, 0, 0);
838  else
839  decode_bgr_1(s, count, 0, 1);
840  }
841 }
842 
843 static void draw_slice(HYuvContext *s, AVFrame *frame, int y)
844 {
845  int h, cy, i;
846  int offset[AV_NUM_DATA_POINTERS];
847 
848  if (!s->avctx->draw_horiz_band)
849  return;
850 
851  h = y - s->last_slice_end;
852  y -= h;
853 
854  if (s->bitstream_bpp == 12)
855  cy = y >> 1;
856  else
857  cy = y;
858 
859  offset[0] = frame->linesize[0] * y;
860  offset[1] = frame->linesize[1] * cy;
861  offset[2] = frame->linesize[2] * cy;
862  for (i = 3; i < AV_NUM_DATA_POINTERS; i++)
863  offset[i] = 0;
864  emms_c();
865 
866  s->avctx->draw_horiz_band(s->avctx, frame, offset, y, 3, h);
867 
868  s->last_slice_end = y + h;
869 }
870 
871 static int left_prediction(HYuvContext *s, uint8_t *dst, const uint8_t *src, int w, int acc)
872 {
873  if (s->bps <= 8) {
874  return s->hdsp.add_hfyu_left_pred(dst, src, w, acc);
875  } else {
876  return s->llviddsp.add_hfyu_left_pred_int16(( uint16_t *)dst, (const uint16_t *)src, s->n-1, w, acc);
877  }
878 }
879 
880 static void add_bytes(HYuvContext *s, uint8_t *dst, uint8_t *src, int w)
881 {
882  if (s->bps <= 8) {
883  s->hdsp.add_bytes(dst, src, w);
884  } else {
885  s->llviddsp.add_int16((uint16_t*)dst, (const uint16_t*)src, s->n - 1, w);
886  }
887 }
888 
889 static void add_median_prediction(HYuvContext *s, uint8_t *dst, const uint8_t *src, const uint8_t *diff, int w, int *left, int *left_top)
890 {
891  if (s->bps <= 8) {
892  s->hdsp.add_hfyu_median_pred(dst, src, diff, w, left, left_top);
893  } else {
894  s->llviddsp.add_hfyu_median_pred_int16((uint16_t *)dst, (const uint16_t *)src, (const uint16_t *)diff, s->n-1, w, left, left_top);
895  }
896 }
897 static int decode_frame(AVCodecContext *avctx, void *data, int *got_frame,
898  AVPacket *avpkt)
899 {
900  const uint8_t *buf = avpkt->data;
901  int buf_size = avpkt->size;
902  HYuvContext *s = avctx->priv_data;
903  const int width = s->width;
904  const int width2 = s->width >> 1;
905  const int height = s->height;
906  int fake_ystride, fake_ustride, fake_vstride;
907  ThreadFrame frame = { .f = data };
908  AVFrame *const p = data;
909  int table_size = 0, ret;
910 
911  av_fast_padded_malloc(&s->bitstream_buffer,
912  &s->bitstream_buffer_size,
913  buf_size);
914  if (!s->bitstream_buffer)
915  return AVERROR(ENOMEM);
916 
917  s->bdsp.bswap_buf((uint32_t *) s->bitstream_buffer,
918  (const uint32_t *) buf, buf_size / 4);
919 
920  if ((ret = ff_thread_get_buffer(avctx, &frame, 0)) < 0)
921  return ret;
922 
923  if (s->context) {
924  table_size = read_huffman_tables(s, s->bitstream_buffer, buf_size);
925  if (table_size < 0)
926  return table_size;
927  }
928 
929  if ((unsigned) (buf_size - table_size) >= INT_MAX / 8)
930  return AVERROR_INVALIDDATA;
931 
932  if ((ret = init_get_bits(&s->gb, s->bitstream_buffer + table_size,
933  (buf_size - table_size) * 8)) < 0)
934  return ret;
935 
936  fake_ystride = s->interlaced ? p->linesize[0] * 2 : p->linesize[0];
937  fake_ustride = s->interlaced ? p->linesize[1] * 2 : p->linesize[1];
938  fake_vstride = s->interlaced ? p->linesize[2] * 2 : p->linesize[2];
939 
940  s->last_slice_end = 0;
941 
942  if (s->version > 2) {
943  int plane;
944  for(plane = 0; plane < 1 + 2*s->chroma + s->alpha; plane++) {
945  int left, lefttop, y;
946  int w = width;
947  int h = height;
948  int fake_stride = fake_ystride;
949 
950  if (s->chroma && (plane == 1 || plane == 2)) {
951  w >>= s->chroma_h_shift;
952  h >>= s->chroma_v_shift;
953  fake_stride = plane == 1 ? fake_ustride : fake_vstride;
954  }
955 
956  switch (s->predictor) {
957  case LEFT:
958  case PLANE:
959  decode_plane_bitstream(s, w, plane);
960  left = left_prediction(s, p->data[plane], s->temp[0], w, 0);
961 
962  for (y = 1; y < h; y++) {
963  uint8_t *dst = p->data[plane] + p->linesize[plane]*y;
964 
965  decode_plane_bitstream(s, w, plane);
966  left = left_prediction(s, dst, s->temp[0], w, left);
967  if (s->predictor == PLANE) {
968  if (y > s->interlaced) {
969  add_bytes(s, dst, dst - fake_stride, w);
970  }
971  }
972  }
973 
974  break;
975  case MEDIAN:
976  decode_plane_bitstream(s, w, plane);
977  left= left_prediction(s, p->data[plane], s->temp[0], w, 0);
978 
979  y = 1;
980 
981  /* second line is left predicted for interlaced case */
982  if (s->interlaced) {
983  decode_plane_bitstream(s, w, plane);
984  left = left_prediction(s, p->data[plane] + p->linesize[plane], s->temp[0], w, left);
985  y++;
986  }
987 
988  lefttop = p->data[plane][0];
989  decode_plane_bitstream(s, w, plane);
990  add_median_prediction(s, p->data[plane] + fake_stride, p->data[plane], s->temp[0], w, &left, &lefttop);
991  y++;
992 
993  for (; y<h; y++) {
994  uint8_t *dst;
995 
996  decode_plane_bitstream(s, w, plane);
997 
998  dst = p->data[plane] + p->linesize[plane] * y;
999 
1000  add_median_prediction(s, dst, dst - fake_stride, s->temp[0], w, &left, &lefttop);
1001  }
1002 
1003  break;
1004  }
1005  }
1006  draw_slice(s, p, height);
1007  } else if (s->bitstream_bpp < 24) {
1008  int y, cy;
1009  int lefty, leftu, leftv;
1010  int lefttopy, lefttopu, lefttopv;
1011 
1012  if (s->yuy2) {
1013  p->data[0][3] = get_bits(&s->gb, 8);
1014  p->data[0][2] = get_bits(&s->gb, 8);
1015  p->data[0][1] = get_bits(&s->gb, 8);
1016  p->data[0][0] = get_bits(&s->gb, 8);
1017 
1018  av_log(avctx, AV_LOG_ERROR,
1019  "YUY2 output is not implemented yet\n");
1020  return AVERROR_PATCHWELCOME;
1021  } else {
1022  leftv =
1023  p->data[2][0] = get_bits(&s->gb, 8);
1024  lefty =
1025  p->data[0][1] = get_bits(&s->gb, 8);
1026  leftu =
1027  p->data[1][0] = get_bits(&s->gb, 8);
1028  p->data[0][0] = get_bits(&s->gb, 8);
1029 
1030  switch (s->predictor) {
1031  case LEFT:
1032  case PLANE:
1033  decode_422_bitstream(s, width - 2);
1034  lefty = s->hdsp.add_hfyu_left_pred(p->data[0] + 2, s->temp[0],
1035  width - 2, lefty);
1036  if (!(s->flags & CODEC_FLAG_GRAY)) {
1037  leftu = s->hdsp.add_hfyu_left_pred(p->data[1] + 1, s->temp[1], width2 - 1, leftu);
1038  leftv = s->hdsp.add_hfyu_left_pred(p->data[2] + 1, s->temp[2], width2 - 1, leftv);
1039  }
1040 
1041  for (cy = y = 1; y < s->height; y++, cy++) {
1042  uint8_t *ydst, *udst, *vdst;
1043 
1044  if (s->bitstream_bpp == 12) {
1045  decode_gray_bitstream(s, width);
1046 
1047  ydst = p->data[0] + p->linesize[0] * y;
1048 
1049  lefty = s->hdsp.add_hfyu_left_pred(ydst, s->temp[0],
1050  width, lefty);
1051  if (s->predictor == PLANE) {
1052  if (y > s->interlaced)
1053  s->hdsp.add_bytes(ydst, ydst - fake_ystride, width);
1054  }
1055  y++;
1056  if (y >= s->height)
1057  break;
1058  }
1059 
1060  draw_slice(s, p, y);
1061 
1062  ydst = p->data[0] + p->linesize[0] * y;
1063  udst = p->data[1] + p->linesize[1] * cy;
1064  vdst = p->data[2] + p->linesize[2] * cy;
1065 
1066  decode_422_bitstream(s, width);
1067  lefty = s->hdsp.add_hfyu_left_pred(ydst, s->temp[0],
1068  width, lefty);
1069  if (!(s->flags & CODEC_FLAG_GRAY)) {
1070  leftu = s->hdsp.add_hfyu_left_pred(udst, s->temp[1], width2, leftu);
1071  leftv = s->hdsp.add_hfyu_left_pred(vdst, s->temp[2], width2, leftv);
1072  }
1073  if (s->predictor == PLANE) {
1074  if (cy > s->interlaced) {
1075  s->hdsp.add_bytes(ydst, ydst - fake_ystride, width);
1076  if (!(s->flags & CODEC_FLAG_GRAY)) {
1077  s->hdsp.add_bytes(udst, udst - fake_ustride, width2);
1078  s->hdsp.add_bytes(vdst, vdst - fake_vstride, width2);
1079  }
1080  }
1081  }
1082  }
1083  draw_slice(s, p, height);
1084 
1085  break;
1086  case MEDIAN:
1087  /* first line except first 2 pixels is left predicted */
1088  decode_422_bitstream(s, width - 2);
1089  lefty = s->hdsp.add_hfyu_left_pred(p->data[0] + 2, s->temp[0],
1090  width - 2, lefty);
1091  if (!(s->flags & CODEC_FLAG_GRAY)) {
1092  leftu = s->hdsp.add_hfyu_left_pred(p->data[1] + 1, s->temp[1], width2 - 1, leftu);
1093  leftv = s->hdsp.add_hfyu_left_pred(p->data[2] + 1, s->temp[2], width2 - 1, leftv);
1094  }
1095 
1096  cy = y = 1;
1097 
1098  /* second line is left predicted for interlaced case */
1099  if (s->interlaced) {
1100  decode_422_bitstream(s, width);
1101  lefty = s->hdsp.add_hfyu_left_pred(p->data[0] + p->linesize[0],
1102  s->temp[0], width, lefty);
1103  if (!(s->flags & CODEC_FLAG_GRAY)) {
1104  leftu = s->hdsp.add_hfyu_left_pred(p->data[1] + p->linesize[2], s->temp[1], width2, leftu);
1105  leftv = s->hdsp.add_hfyu_left_pred(p->data[2] + p->linesize[1], s->temp[2], width2, leftv);
1106  }
1107  y++;
1108  cy++;
1109  }
1110 
1111  /* next 4 pixels are left predicted too */
1112  decode_422_bitstream(s, 4);
1113  lefty = s->hdsp.add_hfyu_left_pred(p->data[0] + fake_ystride,
1114  s->temp[0], 4, lefty);
1115  if (!(s->flags & CODEC_FLAG_GRAY)) {
1116  leftu = s->hdsp.add_hfyu_left_pred(p->data[1] + fake_ustride, s->temp[1], 2, leftu);
1117  leftv = s->hdsp.add_hfyu_left_pred(p->data[2] + fake_vstride, s->temp[2], 2, leftv);
1118  }
1119 
1120  /* next line except the first 4 pixels is median predicted */
1121  lefttopy = p->data[0][3];
1122  decode_422_bitstream(s, width - 4);
1123  s->hdsp.add_hfyu_median_pred(p->data[0] + fake_ystride + 4,
1124  p->data[0] + 4, s->temp[0],
1125  width - 4, &lefty, &lefttopy);
1126  if (!(s->flags & CODEC_FLAG_GRAY)) {
1127  lefttopu = p->data[1][1];
1128  lefttopv = p->data[2][1];
1129  s->hdsp.add_hfyu_median_pred(p->data[1] + fake_ustride + 2, p->data[1] + 2, s->temp[1], width2 - 2, &leftu, &lefttopu);
1130  s->hdsp.add_hfyu_median_pred(p->data[2] + fake_vstride + 2, p->data[2] + 2, s->temp[2], width2 - 2, &leftv, &lefttopv);
1131  }
1132  y++;
1133  cy++;
1134 
1135  for (; y < height; y++, cy++) {
1136  uint8_t *ydst, *udst, *vdst;
1137 
1138  if (s->bitstream_bpp == 12) {
1139  while (2 * cy > y) {
1140  decode_gray_bitstream(s, width);
1141  ydst = p->data[0] + p->linesize[0] * y;
1142  s->hdsp.add_hfyu_median_pred(ydst, ydst - fake_ystride,
1143  s->temp[0], width,
1144  &lefty, &lefttopy);
1145  y++;
1146  }
1147  if (y >= height)
1148  break;
1149  }
1150  draw_slice(s, p, y);
1151 
1152  decode_422_bitstream(s, width);
1153 
1154  ydst = p->data[0] + p->linesize[0] * y;
1155  udst = p->data[1] + p->linesize[1] * cy;
1156  vdst = p->data[2] + p->linesize[2] * cy;
1157 
1158  s->hdsp.add_hfyu_median_pred(ydst, ydst - fake_ystride,
1159  s->temp[0], width,
1160  &lefty, &lefttopy);
1161  if (!(s->flags & CODEC_FLAG_GRAY)) {
1162  s->hdsp.add_hfyu_median_pred(udst, udst - fake_ustride, s->temp[1], width2, &leftu, &lefttopu);
1163  s->hdsp.add_hfyu_median_pred(vdst, vdst - fake_vstride, s->temp[2], width2, &leftv, &lefttopv);
1164  }
1165  }
1166 
1167  draw_slice(s, p, height);
1168  break;
1169  }
1170  }
1171  } else {
1172  int y;
1173  uint8_t left[4];
1174  const int last_line = (height - 1) * p->linesize[0];
1175 
1176  if (s->bitstream_bpp == 32) {
1177  left[A] = p->data[0][last_line + A] = get_bits(&s->gb, 8);
1178  left[R] = p->data[0][last_line + R] = get_bits(&s->gb, 8);
1179  left[G] = p->data[0][last_line + G] = get_bits(&s->gb, 8);
1180  left[B] = p->data[0][last_line + B] = get_bits(&s->gb, 8);
1181  } else {
1182  left[R] = p->data[0][last_line + R] = get_bits(&s->gb, 8);
1183  left[G] = p->data[0][last_line + G] = get_bits(&s->gb, 8);
1184  left[B] = p->data[0][last_line + B] = get_bits(&s->gb, 8);
1185  left[A] = p->data[0][last_line + A] = 255;
1186  skip_bits(&s->gb, 8);
1187  }
1188 
1189  if (s->bgr32) {
1190  switch (s->predictor) {
1191  case LEFT:
1192  case PLANE:
1193  decode_bgr_bitstream(s, width - 1);
1194  s->hdsp.add_hfyu_left_pred_bgr32(p->data[0] + last_line + 4,
1195  s->temp[0], width - 1, left);
1196 
1197  for (y = s->height - 2; y >= 0; y--) { // Yes it is stored upside down.
1198  decode_bgr_bitstream(s, width);
1199 
1200  s->hdsp.add_hfyu_left_pred_bgr32(p->data[0] + p->linesize[0] * y,
1201  s->temp[0], width, left);
1202  if (s->predictor == PLANE) {
1203  if (s->bitstream_bpp != 32)
1204  left[A] = 0;
1205  if (y < s->height - 1 - s->interlaced) {
1206  s->hdsp.add_bytes(p->data[0] + p->linesize[0] * y,
1207  p->data[0] + p->linesize[0] * y +
1208  fake_ystride, 4 * width);
1209  }
1210  }
1211  }
1212  // just 1 large slice as this is not possible in reverse order
1213  draw_slice(s, p, height);
1214  break;
1215  default:
1216  av_log(avctx, AV_LOG_ERROR,
1217  "prediction type not supported!\n");
1218  }
1219  } else {
1220  av_log(avctx, AV_LOG_ERROR,
1221  "BGR24 output is not implemented yet\n");
1222  return AVERROR_PATCHWELCOME;
1223  }
1224  }
1225  emms_c();
1226 
1227  *got_frame = 1;
1228 
1229  return (get_bits_count(&s->gb) + 31) / 32 * 4 + table_size;
1230 }
1231 
1232 AVCodec ff_huffyuv_decoder = {
1233  .name = "huffyuv",
1234  .long_name = NULL_IF_CONFIG_SMALL("Huffyuv / HuffYUV"),
1235  .type = AVMEDIA_TYPE_VIDEO,
1236  .id = AV_CODEC_ID_HUFFYUV,
1237  .priv_data_size = sizeof(HYuvContext),
1238  .init = decode_init,
1239  .close = decode_end,
1240  .decode = decode_frame,
1241  .capabilities = CODEC_CAP_DR1 | CODEC_CAP_DRAW_HORIZ_BAND |
1242  CODEC_CAP_FRAME_THREADS,
1243  .init_thread_copy = ONLY_IF_THREADS_ENABLED(decode_init_thread_copy),
1244 };
1245 
1246 #if CONFIG_FFVHUFF_DECODER
1247 AVCodec ff_ffvhuff_decoder = {
1248  .name = "ffvhuff",
1249  .long_name = NULL_IF_CONFIG_SMALL("Huffyuv FFmpeg variant"),
1250  .type = AVMEDIA_TYPE_VIDEO,
1251  .id = AV_CODEC_ID_FFVHUFF,
1252  .priv_data_size = sizeof(HYuvContext),
1253  .init = decode_init,
1254  .close = decode_end,
1255  .decode = decode_frame,
1256  .capabilities = CODEC_CAP_DR1 | CODEC_CAP_DRAW_HORIZ_BAND |
1257  CODEC_CAP_FRAME_THREADS,
1258  .init_thread_copy = ONLY_IF_THREADS_ENABLED(decode_init_thread_copy),
1259 };
1260 #endif /* CONFIG_FFVHUFF_DECODER */
Generated on Fri Dec 5 2014 04:41:56 for FFmpeg by   doxygen 1.8.2