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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_init(AVCodecContext *avctx)
276 {
277  HYuvContext *s = avctx->priv_data;
278  int ret;
279 
280  ff_huffyuvdsp_init(&s->hdsp);
281  memset(s->vlc, 0, 4 * sizeof(VLC));
282 
283  s->interlaced = avctx->height > 288;
284  s->bgr32 = 1;
285 
286  if (avctx->extradata_size) {
287  if ((avctx->bits_per_coded_sample & 7) &&
288  avctx->bits_per_coded_sample != 12)
289  s->version = 1; // do such files exist at all?
290  else if (avctx->extradata_size > 3 && avctx->extradata[3] == 0)
291  s->version = 2;
292  else
293  s->version = 3;
294  } else
295  s->version = 0;
296 
297  s->bps = 8;
298  s->n = 1<<s->bps;
299  s->vlc_n = FFMIN(s->n, MAX_VLC_N);
300  s->chroma = 1;
301  if (s->version >= 2) {
302  int method, interlace;
303 
304  if (avctx->extradata_size < 4)
305  return AVERROR_INVALIDDATA;
306 
307  method = avctx->extradata[0];
308  s->decorrelate = method & 64 ? 1 : 0;
309  s->predictor = method & 63;
310  if (s->version == 2) {
311  s->bitstream_bpp = avctx->extradata[1];
312  if (s->bitstream_bpp == 0)
313  s->bitstream_bpp = avctx->bits_per_coded_sample & ~7;
314  } else {
315  s->bps = (avctx->extradata[1] >> 4) + 1;
316  s->n = 1<<s->bps;
317  s->vlc_n = FFMIN(s->n, MAX_VLC_N);
318  s->chroma_h_shift = avctx->extradata[1] & 3;
319  s->chroma_v_shift = (avctx->extradata[1] >> 2) & 3;
320  s->yuv = !!(avctx->extradata[2] & 1);
321  s->chroma= !!(avctx->extradata[2] & 3);
322  s->alpha = !!(avctx->extradata[2] & 4);
323  }
324  interlace = (avctx->extradata[2] & 0x30) >> 4;
325  s->interlaced = (interlace == 1) ? 1 : (interlace == 2) ? 0 : s->interlaced;
326  s->context = avctx->extradata[2] & 0x40 ? 1 : 0;
327 
328  if ((ret = read_huffman_tables(s, avctx->extradata + 4,
329  avctx->extradata_size - 4)) < 0)
330  return ret;
331  } else {
332  switch (avctx->bits_per_coded_sample & 7) {
333  case 1:
334  s->predictor = LEFT;
335  s->decorrelate = 0;
336  break;
337  case 2:
338  s->predictor = LEFT;
339  s->decorrelate = 1;
340  break;
341  case 3:
342  s->predictor = PLANE;
343  s->decorrelate = avctx->bits_per_coded_sample >= 24;
344  break;
345  case 4:
346  s->predictor = MEDIAN;
347  s->decorrelate = 0;
348  break;
349  default:
350  s->predictor = LEFT; // OLD
351  s->decorrelate = 0;
352  break;
353  }
354  s->bitstream_bpp = avctx->bits_per_coded_sample & ~7;
355  s->context = 0;
356 
357  if ((ret = read_old_huffman_tables(s)) < 0)
358  return ret;
359  }
360 
361  if (s->version <= 2) {
362  switch (s->bitstream_bpp) {
363  case 12:
364  avctx->pix_fmt = AV_PIX_FMT_YUV420P;
365  s->yuv = 1;
366  break;
367  case 16:
368  if (s->yuy2)
369  avctx->pix_fmt = AV_PIX_FMT_YUYV422;
370  else
371  avctx->pix_fmt = AV_PIX_FMT_YUV422P;
372  s->yuv = 1;
373  break;
374  case 24:
375  if (s->bgr32)
376  avctx->pix_fmt = AV_PIX_FMT_0RGB32;
377  else
378  avctx->pix_fmt = AV_PIX_FMT_BGR24;
379  break;
380  case 32:
381  av_assert0(s->bgr32);
382  avctx->pix_fmt = AV_PIX_FMT_RGB32;
383  s->alpha = 1;
384  break;
385  default:
386  return AVERROR_INVALIDDATA;
387  }
388  av_pix_fmt_get_chroma_sub_sample(avctx->pix_fmt,
389  &s->chroma_h_shift,
390  &s->chroma_v_shift);
391  } else {
392  switch ( (s->chroma<<10) | (s->yuv<<9) | (s->alpha<<8) | ((s->bps-1)<<4) | s->chroma_h_shift | (s->chroma_v_shift<<2)) {
393  case 0x070:
394  avctx->pix_fmt = AV_PIX_FMT_GRAY8;
395  break;
396  case 0x0F0:
397  avctx->pix_fmt = AV_PIX_FMT_GRAY16;
398  break;
399  case 0x170:
400  avctx->pix_fmt = AV_PIX_FMT_GRAY8A;
401  break;
402  case 0x470:
403  avctx->pix_fmt = AV_PIX_FMT_GBRP;
404  break;
405  case 0x480:
406  avctx->pix_fmt = AV_PIX_FMT_GBRP9;
407  break;
408  case 0x490:
409  avctx->pix_fmt = AV_PIX_FMT_GBRP10;
410  break;
411  case 0x4B0:
412  avctx->pix_fmt = AV_PIX_FMT_GBRP12;
413  break;
414  case 0x4D0:
415  avctx->pix_fmt = AV_PIX_FMT_GBRP14;
416  break;
417  case 0x4F0:
418  avctx->pix_fmt = AV_PIX_FMT_GBRP16;
419  break;
420  case 0x570:
421  avctx->pix_fmt = AV_PIX_FMT_GBRAP;
422  break;
423  case 0x670:
424  avctx->pix_fmt = AV_PIX_FMT_YUV444P;
425  break;
426  case 0x680:
427  avctx->pix_fmt = AV_PIX_FMT_YUV444P9;
428  break;
429  case 0x690:
430  avctx->pix_fmt = AV_PIX_FMT_YUV444P10;
431  break;
432  case 0x6B0:
433  avctx->pix_fmt = AV_PIX_FMT_YUV444P12;
434  break;
435  case 0x6D0:
436  avctx->pix_fmt = AV_PIX_FMT_YUV444P14;
437  break;
438  case 0x6F0:
439  avctx->pix_fmt = AV_PIX_FMT_YUV444P16;
440  break;
441  case 0x671:
442  avctx->pix_fmt = AV_PIX_FMT_YUV422P;
443  break;
444  case 0x681:
445  avctx->pix_fmt = AV_PIX_FMT_YUV422P9;
446  break;
447  case 0x691:
448  avctx->pix_fmt = AV_PIX_FMT_YUV422P10;
449  break;
450  case 0x6B1:
451  avctx->pix_fmt = AV_PIX_FMT_YUV422P12;
452  break;
453  case 0x6D1:
454  avctx->pix_fmt = AV_PIX_FMT_YUV422P14;
455  break;
456  case 0x6F1:
457  avctx->pix_fmt = AV_PIX_FMT_YUV422P16;
458  break;
459  case 0x672:
460  avctx->pix_fmt = AV_PIX_FMT_YUV411P;
461  break;
462  case 0x674:
463  avctx->pix_fmt = AV_PIX_FMT_YUV440P;
464  break;
465  case 0x675:
466  avctx->pix_fmt = AV_PIX_FMT_YUV420P;
467  break;
468  case 0x685:
469  avctx->pix_fmt = AV_PIX_FMT_YUV420P9;
470  break;
471  case 0x695:
472  avctx->pix_fmt = AV_PIX_FMT_YUV420P10;
473  break;
474  case 0x6B5:
475  avctx->pix_fmt = AV_PIX_FMT_YUV420P12;
476  break;
477  case 0x6D5:
478  avctx->pix_fmt = AV_PIX_FMT_YUV420P14;
479  break;
480  case 0x6F5:
481  avctx->pix_fmt = AV_PIX_FMT_YUV420P16;
482  break;
483  case 0x67A:
484  avctx->pix_fmt = AV_PIX_FMT_YUV410P;
485  break;
486  case 0x770:
487  avctx->pix_fmt = AV_PIX_FMT_YUVA444P;
488  break;
489  case 0x780:
490  avctx->pix_fmt = AV_PIX_FMT_YUVA444P9;
491  break;
492  case 0x790:
493  avctx->pix_fmt = AV_PIX_FMT_YUVA444P10;
494  break;
495  case 0x7F0:
496  avctx->pix_fmt = AV_PIX_FMT_YUVA444P16;
497  break;
498  case 0x771:
499  avctx->pix_fmt = AV_PIX_FMT_YUVA422P;
500  break;
501  case 0x781:
502  avctx->pix_fmt = AV_PIX_FMT_YUVA422P9;
503  break;
504  case 0x791:
505  avctx->pix_fmt = AV_PIX_FMT_YUVA422P10;
506  break;
507  case 0x7F1:
508  avctx->pix_fmt = AV_PIX_FMT_YUVA422P16;
509  break;
510  case 0x775:
511  avctx->pix_fmt = AV_PIX_FMT_YUVA420P;
512  break;
513  case 0x785:
514  avctx->pix_fmt = AV_PIX_FMT_YUVA420P9;
515  break;
516  case 0x795:
517  avctx->pix_fmt = AV_PIX_FMT_YUVA420P10;
518  break;
519  case 0x7F5:
520  avctx->pix_fmt = AV_PIX_FMT_YUVA420P16;
521  break;
522  default:
523  return AVERROR_INVALIDDATA;
524  }
525  }
526 
527  ff_huffyuv_common_init(avctx);
528 
529  if ((avctx->pix_fmt == AV_PIX_FMT_YUV422P || avctx->pix_fmt == AV_PIX_FMT_YUV420P) && avctx->width & 1) {
530  av_log(avctx, AV_LOG_ERROR, "width must be even for this colorspace\n");
531  return AVERROR_INVALIDDATA;
532  }
533  if (s->predictor == MEDIAN && avctx->pix_fmt == AV_PIX_FMT_YUV422P &&
534  avctx->width % 4) {
535  av_log(avctx, AV_LOG_ERROR, "width must be a multiple of 4 "
536  "for this combination of colorspace and predictor type.\n");
537  return AVERROR_INVALIDDATA;
538  }
539 
540  if ((ret = ff_huffyuv_alloc_temp(s)) < 0) {
541  ff_huffyuv_common_end(s);
542  return ret;
543  }
544 
545  return 0;
546 }
547 
548 static av_cold int decode_init_thread_copy(AVCodecContext *avctx)
549 {
550  HYuvContext *s = avctx->priv_data;
551  int i, ret;
552 
553  if ((ret = ff_huffyuv_alloc_temp(s)) < 0) {
554  ff_huffyuv_common_end(s);
555  return ret;
556  }
557 
558  for (i = 0; i < 8; i++)
559  s->vlc[i].table = NULL;
560 
561  if (s->version >= 2) {
562  if ((ret = read_huffman_tables(s, avctx->extradata + 4,
563  avctx->extradata_size)) < 0)
564  return ret;
565  } else {
566  if ((ret = read_old_huffman_tables(s)) < 0)
567  return ret;
568  }
569 
570  return 0;
571 }
572 
573 /** Subset of GET_VLC for use in hand-roller VLC code */
574 #define VLC_INTERN(dst, table, gb, name, bits, max_depth) \
575  code = table[index][0]; \
576  n = table[index][1]; \
577  if (max_depth > 1 && n < 0) { \
578  LAST_SKIP_BITS(name, gb, bits); \
579  UPDATE_CACHE(name, gb); \
580  \
581  nb_bits = -n; \
582  index = SHOW_UBITS(name, gb, nb_bits) + code; \
583  code = table[index][0]; \
584  n = table[index][1]; \
585  if (max_depth > 2 && n < 0) { \
586  LAST_SKIP_BITS(name, gb, nb_bits); \
587  UPDATE_CACHE(name, gb); \
588  \
589  nb_bits = -n; \
590  index = SHOW_UBITS(name, gb, nb_bits) + code; \
591  code = table[index][0]; \
592  n = table[index][1]; \
593  } \
594  } \
595  dst = code; \
596  LAST_SKIP_BITS(name, gb, n)
597 
598 
599 #define GET_VLC_DUAL(dst0, dst1, name, gb, dtable, table1, table2, \
600  bits, max_depth, OP) \
601  do { \
602  unsigned int index = SHOW_UBITS(name, gb, bits); \
603  int code, n = dtable[index][1]; \
604  \
605  if (n<=0) { \
606  int nb_bits; \
607  VLC_INTERN(dst0, table1, gb, name, bits, max_depth); \
608  \
609  UPDATE_CACHE(re, gb); \
610  index = SHOW_UBITS(name, gb, bits); \
611  VLC_INTERN(dst1, table2, gb, name, bits, max_depth); \
612  } else { \
613  code = dtable[index][0]; \
614  OP(dst0, dst1, code); \
615  LAST_SKIP_BITS(name, gb, n); \
616  } \
617  } while (0)
618 
619 #define OP8bits(dst0, dst1, code) dst0 = code>>8; dst1 = code
620 
621 #define READ_2PIX(dst0, dst1, plane1) \
622  UPDATE_CACHE(re, &s->gb); \
623  GET_VLC_DUAL(dst0, dst1, re, &s->gb, s->vlc[4+plane1].table, \
624  s->vlc[0].table, s->vlc[plane1].table, VLC_BITS, 3, OP8bits)
625 
626 static void decode_422_bitstream(HYuvContext *s, int count)
627 {
628  int i, icount;
629  OPEN_READER(re, &s->gb);
630  count /= 2;
631 
632  icount = get_bits_left(&s->gb) / (32 * 4);
633  if (count >= icount) {
634  for (i = 0; i < icount; i++) {
635  READ_2PIX(s->temp[0][2 * i], s->temp[1][i], 1);
636  READ_2PIX(s->temp[0][2 * i + 1], s->temp[2][i], 2);
637  }
638  for (; i < count && BITS_LEFT(re, &s->gb) > 0; i++) {
639  READ_2PIX(s->temp[0][2 * i ], s->temp[1][i], 1);
640  if (BITS_LEFT(re, &s->gb) <= 0) break;
641  READ_2PIX(s->temp[0][2 * i + 1], s->temp[2][i], 2);
642  }
643  for (; i < count; i++)
644  s->temp[0][2 * i ] = s->temp[1][i] =
645  s->temp[0][2 * i + 1] = s->temp[2][i] = 0;
646  } else {
647  for (i = 0; i < count; i++) {
648  READ_2PIX(s->temp[0][2 * i], s->temp[1][i], 1);
649  READ_2PIX(s->temp[0][2 * i + 1], s->temp[2][i], 2);
650  }
651  }
652  CLOSE_READER(re, &s->gb);
653 }
654 
655 #define READ_2PIX_PLANE(dst0, dst1, plane, OP) \
656  UPDATE_CACHE(re, &s->gb); \
657  GET_VLC_DUAL(dst0, dst1, re, &s->gb, s->vlc[4+plane].table, \
658  s->vlc[plane].table, s->vlc[plane].table, VLC_BITS, 3, OP)
659 
660 #define OP14bits(dst0, dst1, code) dst0 = code>>8; dst1 = sign_extend(code, 8)
661 
662 /* TODO instead of restarting the read when the code isn't in the first level
663  * of the joint table, jump into the 2nd level of the individual table. */
664 #define READ_2PIX_PLANE16(dst0, dst1, plane){\
665  dst0 = get_vlc2(&s->gb, s->vlc[plane].table, VLC_BITS, 3)<<2;\
666  dst0 += get_bits(&s->gb, 2);\
667  dst1 = get_vlc2(&s->gb, s->vlc[plane].table, VLC_BITS, 3)<<2;\
668  dst1 += get_bits(&s->gb, 2);\
669 }
670 static void decode_plane_bitstream(HYuvContext *s, int width, int plane)
671 {
672  int i, count = width/2;
673 
674  if (s->bps <= 8) {
675  OPEN_READER(re, &s->gb);
676  if (count >= (get_bits_left(&s->gb)) / (32 * 2)) {
677  for (i = 0; i < count && BITS_LEFT(re, &s->gb) > 0; i++) {
678  READ_2PIX_PLANE(s->temp[0][2 * i], s->temp[0][2 * i + 1], plane, OP8bits);
679  }
680  } else {
681  for(i=0; i<count; i++){
682  READ_2PIX_PLANE(s->temp[0][2 * i], s->temp[0][2 * i + 1], plane, OP8bits);
683  }
684  }
685  if( width&1 && BITS_LEFT(re, &s->gb)>0 ) {
686  unsigned int index;
687  int nb_bits, code, n;
688  UPDATE_CACHE(re, &s->gb);
689  index = SHOW_UBITS(re, &s->gb, VLC_BITS);
690  VLC_INTERN(s->temp[0][width-1], s->vlc[plane].table,
691  &s->gb, re, VLC_BITS, 3);
692  }
693  CLOSE_READER(re, &s->gb);
694  } else if (s->bps <= 14) {
695  OPEN_READER(re, &s->gb);
696  if (count >= (get_bits_left(&s->gb)) / (32 * 2)) {
697  for (i = 0; i < count && BITS_LEFT(re, &s->gb) > 0; i++) {
698  READ_2PIX_PLANE(s->temp16[0][2 * i], s->temp16[0][2 * i + 1], plane, OP14bits);
699  }
700  } else {
701  for(i=0; i<count; i++){
702  READ_2PIX_PLANE(s->temp16[0][2 * i], s->temp16[0][2 * i + 1], plane, OP14bits);
703  }
704  }
705  if( width&1 && BITS_LEFT(re, &s->gb)>0 ) {
706  unsigned int index;
707  int nb_bits, code, n;
708  UPDATE_CACHE(re, &s->gb);
709  index = SHOW_UBITS(re, &s->gb, VLC_BITS);
710  VLC_INTERN(s->temp16[0][width-1], s->vlc[plane].table,
711  &s->gb, re, VLC_BITS, 3);
712  }
713  CLOSE_READER(re, &s->gb);
714  } else {
715  if (count >= (get_bits_left(&s->gb)) / (32 * 2)) {
716  for (i = 0; i < count && get_bits_left(&s->gb) > 0; i++) {
717  READ_2PIX_PLANE16(s->temp16[0][2 * i], s->temp16[0][2 * i + 1], plane);
718  }
719  } else {
720  for(i=0; i<count; i++){
721  READ_2PIX_PLANE16(s->temp16[0][2 * i], s->temp16[0][2 * i + 1], plane);
722  }
723  }
724  if( width&1 && get_bits_left(&s->gb)>0 ) {
725  int dst = get_vlc2(&s->gb, s->vlc[plane].table, VLC_BITS, 3)<<2;
726  s->temp16[0][width-1] = dst + get_bits(&s->gb, 2);
727  }
728  }
729 }
730 
731 static void decode_gray_bitstream(HYuvContext *s, int count)
732 {
733  int i;
734  OPEN_READER(re, &s->gb);
735  count /= 2;
736 
737  if (count >= (get_bits_left(&s->gb)) / (32 * 2)) {
738  for (i = 0; i < count && BITS_LEFT(re, &s->gb) > 0; i++) {
739  READ_2PIX(s->temp[0][2 * i], s->temp[0][2 * i + 1], 0);
740  }
741  } else {
742  for (i = 0; i < count; i++) {
743  READ_2PIX(s->temp[0][2 * i], s->temp[0][2 * i + 1], 0);
744  }
745  }
746  CLOSE_READER(re, &s->gb);
747 }
748 
749 static av_always_inline void decode_bgr_1(HYuvContext *s, int count,
750  int decorrelate, int alpha)
751 {
752  int i;
753  OPEN_READER(re, &s->gb);
754 
755  for (i = 0; i < count && BITS_LEFT(re, &s->gb) > 0; i++) {
756  unsigned int index;
757  int code, n, nb_bits;
758 
759  UPDATE_CACHE(re, &s->gb);
760  index = SHOW_UBITS(re, &s->gb, VLC_BITS);
761  n = s->vlc[4].table[index][1];
762 
763  if (n>0) {
764  code = s->vlc[4].table[index][0];
765  *(uint32_t *) &s->temp[0][4 * i] = s->pix_bgr_map[code];
766  LAST_SKIP_BITS(re, &s->gb, n);
767  } else {
768  if (decorrelate) {
769  VLC_INTERN(s->temp[0][4 * i + G], s->vlc[1].table,
770  &s->gb, re, VLC_BITS, 3);
771 
772  UPDATE_CACHE(re, &s->gb);
773  index = SHOW_UBITS(re, &s->gb, VLC_BITS);
774  VLC_INTERN(code, s->vlc[0].table, &s->gb, re, VLC_BITS, 3);
775  s->temp[0][4 * i + B] = code + s->temp[0][4 * i + G];
776 
777  UPDATE_CACHE(re, &s->gb);
778  index = SHOW_UBITS(re, &s->gb, VLC_BITS);
779  VLC_INTERN(code, s->vlc[2].table, &s->gb, re, VLC_BITS, 3);
780  s->temp[0][4 * i + R] = code + s->temp[0][4 * i + G];
781  } else {
782  VLC_INTERN(s->temp[0][4 * i + B], s->vlc[0].table,
783  &s->gb, re, VLC_BITS, 3);
784 
785  UPDATE_CACHE(re, &s->gb);
786  index = SHOW_UBITS(re, &s->gb, VLC_BITS);
787  VLC_INTERN(s->temp[0][4 * i + G], s->vlc[1].table,
788  &s->gb, re, VLC_BITS, 3);
789 
790  UPDATE_CACHE(re, &s->gb);
791  index = SHOW_UBITS(re, &s->gb, VLC_BITS);
792  VLC_INTERN(s->temp[0][4 * i + R], s->vlc[2].table,
793  &s->gb, re, VLC_BITS, 3);
794  }
795  }
796  if (alpha) {
797  UPDATE_CACHE(re, &s->gb);
798  index = SHOW_UBITS(re, &s->gb, VLC_BITS);
799  VLC_INTERN(s->temp[0][4 * i + A], s->vlc[2].table,
800  &s->gb, re, VLC_BITS, 3);
801  } else
802  s->temp[0][4 * i + A] = 0;
803  }
804  CLOSE_READER(re, &s->gb);
805 }
806 
807 static void decode_bgr_bitstream(HYuvContext *s, int count)
808 {
809  if (s->decorrelate) {
810  if (s->bitstream_bpp == 24)
811  decode_bgr_1(s, count, 1, 0);
812  else
813  decode_bgr_1(s, count, 1, 1);
814  } else {
815  if (s->bitstream_bpp == 24)
816  decode_bgr_1(s, count, 0, 0);
817  else
818  decode_bgr_1(s, count, 0, 1);
819  }
820 }
821 
822 static void draw_slice(HYuvContext *s, AVFrame *frame, int y)
823 {
824  int h, cy, i;
825  int offset[AV_NUM_DATA_POINTERS];
826 
827  if (!s->avctx->draw_horiz_band)
828  return;
829 
830  h = y - s->last_slice_end;
831  y -= h;
832 
833  if (s->bitstream_bpp == 12)
834  cy = y >> 1;
835  else
836  cy = y;
837 
838  offset[0] = frame->linesize[0] * y;
839  offset[1] = frame->linesize[1] * cy;
840  offset[2] = frame->linesize[2] * cy;
841  for (i = 3; i < AV_NUM_DATA_POINTERS; i++)
842  offset[i] = 0;
843  emms_c();
844 
845  s->avctx->draw_horiz_band(s->avctx, frame, offset, y, 3, h);
846 
847  s->last_slice_end = y + h;
848 }
849 
850 static int left_prediction(HYuvContext *s, uint8_t *dst, const uint8_t *src, int w, int acc)
851 {
852  if (s->bps <= 8) {
853  return s->hdsp.add_hfyu_left_pred(dst, src, w, acc);
854  } else {
855  return s->llviddsp.add_hfyu_left_pred_int16(( uint16_t *)dst, (const uint16_t *)src, s->n-1, w, acc);
856  }
857 }
858 
859 static void add_bytes(HYuvContext *s, uint8_t *dst, uint8_t *src, int w)
860 {
861  if (s->bps <= 8) {
862  s->hdsp.add_bytes(dst, src, w);
863  } else {
864  s->llviddsp.add_int16((uint16_t*)dst, (const uint16_t*)src, s->n - 1, w);
865  }
866 }
867 
868 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)
869 {
870  if (s->bps <= 8) {
871  s->hdsp.add_hfyu_median_pred(dst, src, diff, w, left, left_top);
872  } else {
873  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);
874  }
875 }
876 static int decode_frame(AVCodecContext *avctx, void *data, int *got_frame,
877  AVPacket *avpkt)
878 {
879  const uint8_t *buf = avpkt->data;
880  int buf_size = avpkt->size;
881  HYuvContext *s = avctx->priv_data;
882  const int width = s->width;
883  const int width2 = s->width >> 1;
884  const int height = s->height;
885  int fake_ystride, fake_ustride, fake_vstride;
886  ThreadFrame frame = { .f = data };
887  AVFrame *const p = data;
888  int table_size = 0, ret;
889 
890  av_fast_padded_malloc(&s->bitstream_buffer,
891  &s->bitstream_buffer_size,
892  buf_size);
893  if (!s->bitstream_buffer)
894  return AVERROR(ENOMEM);
895 
896  s->bdsp.bswap_buf((uint32_t *) s->bitstream_buffer,
897  (const uint32_t *) buf, buf_size / 4);
898 
899  if ((ret = ff_thread_get_buffer(avctx, &frame, 0)) < 0)
900  return ret;
901 
902  if (s->context) {
903  table_size = read_huffman_tables(s, s->bitstream_buffer, buf_size);
904  if (table_size < 0)
905  return table_size;
906  }
907 
908  if ((unsigned) (buf_size - table_size) >= INT_MAX / 8)
909  return AVERROR_INVALIDDATA;
910 
911  if ((ret = init_get_bits(&s->gb, s->bitstream_buffer + table_size,
912  (buf_size - table_size) * 8)) < 0)
913  return ret;
914 
915  fake_ystride = s->interlaced ? p->linesize[0] * 2 : p->linesize[0];
916  fake_ustride = s->interlaced ? p->linesize[1] * 2 : p->linesize[1];
917  fake_vstride = s->interlaced ? p->linesize[2] * 2 : p->linesize[2];
918 
919  s->last_slice_end = 0;
920 
921  if (s->version > 2) {
922  int plane;
923  for(plane = 0; plane < 1 + 2*s->chroma + s->alpha; plane++) {
924  int left, lefttop, y;
925  int w = width;
926  int h = height;
927  int fake_stride = fake_ystride;
928 
929  if (s->chroma && (plane == 1 || plane == 2)) {
930  w >>= s->chroma_h_shift;
931  h >>= s->chroma_v_shift;
932  fake_stride = plane == 1 ? fake_ustride : fake_vstride;
933  }
934 
935  switch (s->predictor) {
936  case LEFT:
937  case PLANE:
938  decode_plane_bitstream(s, w, plane);
939  left = left_prediction(s, p->data[plane], s->temp[0], w, 0);
940 
941  for (y = 1; y < h; y++) {
942  uint8_t *dst = p->data[plane] + p->linesize[plane]*y;
943 
944  decode_plane_bitstream(s, w, plane);
945  left = left_prediction(s, dst, s->temp[0], w, left);
946  if (s->predictor == PLANE) {
947  if (y > s->interlaced) {
948  add_bytes(s, dst, dst - fake_stride, w);
949  }
950  }
951  }
952 
953  break;
954  case MEDIAN:
955  decode_plane_bitstream(s, w, plane);
956  left= left_prediction(s, p->data[plane], s->temp[0], w, 0);
957 
958  y = 1;
959 
960  /* second line is left predicted for interlaced case */
961  if (s->interlaced) {
962  decode_plane_bitstream(s, w, plane);
963  left = left_prediction(s, p->data[plane] + p->linesize[plane], s->temp[0], w, left);
964  y++;
965  }
966 
967  lefttop = p->data[plane][0];
968  decode_plane_bitstream(s, w, plane);
969  add_median_prediction(s, p->data[plane] + fake_stride, p->data[plane], s->temp[0], w, &left, &lefttop);
970  y++;
971 
972  for (; y<h; y++) {
973  uint8_t *dst;
974 
975  decode_plane_bitstream(s, w, plane);
976 
977  dst = p->data[plane] + p->linesize[plane] * y;
978 
979  add_median_prediction(s, dst, dst - fake_stride, s->temp[0], w, &left, &lefttop);
980  }
981 
982  break;
983  }
984  }
985  draw_slice(s, p, height);
986  } else if (s->bitstream_bpp < 24) {
987  int y, cy;
988  int lefty, leftu, leftv;
989  int lefttopy, lefttopu, lefttopv;
990 
991  if (s->yuy2) {
992  p->data[0][3] = get_bits(&s->gb, 8);
993  p->data[0][2] = get_bits(&s->gb, 8);
994  p->data[0][1] = get_bits(&s->gb, 8);
995  p->data[0][0] = get_bits(&s->gb, 8);
996 
997  av_log(avctx, AV_LOG_ERROR,
998  "YUY2 output is not implemented yet\n");
999  return AVERROR_PATCHWELCOME;
1000  } else {
1001  leftv =
1002  p->data[2][0] = get_bits(&s->gb, 8);
1003  lefty =
1004  p->data[0][1] = get_bits(&s->gb, 8);
1005  leftu =
1006  p->data[1][0] = get_bits(&s->gb, 8);
1007  p->data[0][0] = get_bits(&s->gb, 8);
1008 
1009  switch (s->predictor) {
1010  case LEFT:
1011  case PLANE:
1012  decode_422_bitstream(s, width - 2);
1013  lefty = s->hdsp.add_hfyu_left_pred(p->data[0] + 2, s->temp[0],
1014  width - 2, lefty);
1015  if (!(s->flags & CODEC_FLAG_GRAY)) {
1016  leftu = s->hdsp.add_hfyu_left_pred(p->data[1] + 1, s->temp[1], width2 - 1, leftu);
1017  leftv = s->hdsp.add_hfyu_left_pred(p->data[2] + 1, s->temp[2], width2 - 1, leftv);
1018  }
1019 
1020  for (cy = y = 1; y < s->height; y++, cy++) {
1021  uint8_t *ydst, *udst, *vdst;
1022 
1023  if (s->bitstream_bpp == 12) {
1024  decode_gray_bitstream(s, width);
1025 
1026  ydst = p->data[0] + p->linesize[0] * y;
1027 
1028  lefty = s->hdsp.add_hfyu_left_pred(ydst, s->temp[0],
1029  width, lefty);
1030  if (s->predictor == PLANE) {
1031  if (y > s->interlaced)
1032  s->hdsp.add_bytes(ydst, ydst - fake_ystride, width);
1033  }
1034  y++;
1035  if (y >= s->height)
1036  break;
1037  }
1038 
1039  draw_slice(s, p, y);
1040 
1041  ydst = p->data[0] + p->linesize[0] * y;
1042  udst = p->data[1] + p->linesize[1] * cy;
1043  vdst = p->data[2] + p->linesize[2] * cy;
1044 
1045  decode_422_bitstream(s, width);
1046  lefty = s->hdsp.add_hfyu_left_pred(ydst, s->temp[0],
1047  width, lefty);
1048  if (!(s->flags & CODEC_FLAG_GRAY)) {
1049  leftu = s->hdsp.add_hfyu_left_pred(udst, s->temp[1], width2, leftu);
1050  leftv = s->hdsp.add_hfyu_left_pred(vdst, s->temp[2], width2, leftv);
1051  }
1052  if (s->predictor == PLANE) {
1053  if (cy > s->interlaced) {
1054  s->hdsp.add_bytes(ydst, ydst - fake_ystride, width);
1055  if (!(s->flags & CODEC_FLAG_GRAY)) {
1056  s->hdsp.add_bytes(udst, udst - fake_ustride, width2);
1057  s->hdsp.add_bytes(vdst, vdst - fake_vstride, width2);
1058  }
1059  }
1060  }
1061  }
1062  draw_slice(s, p, height);
1063 
1064  break;
1065  case MEDIAN:
1066  /* first line except first 2 pixels is left predicted */
1067  decode_422_bitstream(s, width - 2);
1068  lefty = s->hdsp.add_hfyu_left_pred(p->data[0] + 2, s->temp[0],
1069  width - 2, lefty);
1070  if (!(s->flags & CODEC_FLAG_GRAY)) {
1071  leftu = s->hdsp.add_hfyu_left_pred(p->data[1] + 1, s->temp[1], width2 - 1, leftu);
1072  leftv = s->hdsp.add_hfyu_left_pred(p->data[2] + 1, s->temp[2], width2 - 1, leftv);
1073  }
1074 
1075  cy = y = 1;
1076 
1077  /* second line is left predicted for interlaced case */
1078  if (s->interlaced) {
1079  decode_422_bitstream(s, width);
1080  lefty = s->hdsp.add_hfyu_left_pred(p->data[0] + p->linesize[0],
1081  s->temp[0], width, lefty);
1082  if (!(s->flags & CODEC_FLAG_GRAY)) {
1083  leftu = s->hdsp.add_hfyu_left_pred(p->data[1] + p->linesize[2], s->temp[1], width2, leftu);
1084  leftv = s->hdsp.add_hfyu_left_pred(p->data[2] + p->linesize[1], s->temp[2], width2, leftv);
1085  }
1086  y++;
1087  cy++;
1088  }
1089 
1090  /* next 4 pixels are left predicted too */
1091  decode_422_bitstream(s, 4);
1092  lefty = s->hdsp.add_hfyu_left_pred(p->data[0] + fake_ystride,
1093  s->temp[0], 4, lefty);
1094  if (!(s->flags & CODEC_FLAG_GRAY)) {
1095  leftu = s->hdsp.add_hfyu_left_pred(p->data[1] + fake_ustride, s->temp[1], 2, leftu);
1096  leftv = s->hdsp.add_hfyu_left_pred(p->data[2] + fake_vstride, s->temp[2], 2, leftv);
1097  }
1098 
1099  /* next line except the first 4 pixels is median predicted */
1100  lefttopy = p->data[0][3];
1101  decode_422_bitstream(s, width - 4);
1102  s->hdsp.add_hfyu_median_pred(p->data[0] + fake_ystride + 4,
1103  p->data[0] + 4, s->temp[0],
1104  width - 4, &lefty, &lefttopy);
1105  if (!(s->flags & CODEC_FLAG_GRAY)) {
1106  lefttopu = p->data[1][1];
1107  lefttopv = p->data[2][1];
1108  s->hdsp.add_hfyu_median_pred(p->data[1] + fake_ustride + 2, p->data[1] + 2, s->temp[1], width2 - 2, &leftu, &lefttopu);
1109  s->hdsp.add_hfyu_median_pred(p->data[2] + fake_vstride + 2, p->data[2] + 2, s->temp[2], width2 - 2, &leftv, &lefttopv);
1110  }
1111  y++;
1112  cy++;
1113 
1114  for (; y < height; y++, cy++) {
1115  uint8_t *ydst, *udst, *vdst;
1116 
1117  if (s->bitstream_bpp == 12) {
1118  while (2 * cy > y) {
1119  decode_gray_bitstream(s, width);
1120  ydst = p->data[0] + p->linesize[0] * y;
1121  s->hdsp.add_hfyu_median_pred(ydst, ydst - fake_ystride,
1122  s->temp[0], width,
1123  &lefty, &lefttopy);
1124  y++;
1125  }
1126  if (y >= height)
1127  break;
1128  }
1129  draw_slice(s, p, y);
1130 
1131  decode_422_bitstream(s, width);
1132 
1133  ydst = p->data[0] + p->linesize[0] * y;
1134  udst = p->data[1] + p->linesize[1] * cy;
1135  vdst = p->data[2] + p->linesize[2] * cy;
1136 
1137  s->hdsp.add_hfyu_median_pred(ydst, ydst - fake_ystride,
1138  s->temp[0], width,
1139  &lefty, &lefttopy);
1140  if (!(s->flags & CODEC_FLAG_GRAY)) {
1141  s->hdsp.add_hfyu_median_pred(udst, udst - fake_ustride, s->temp[1], width2, &leftu, &lefttopu);
1142  s->hdsp.add_hfyu_median_pred(vdst, vdst - fake_vstride, s->temp[2], width2, &leftv, &lefttopv);
1143  }
1144  }
1145 
1146  draw_slice(s, p, height);
1147  break;
1148  }
1149  }
1150  } else {
1151  int y;
1152  uint8_t left[4];
1153  const int last_line = (height - 1) * p->linesize[0];
1154 
1155  if (s->bitstream_bpp == 32) {
1156  left[A] = p->data[0][last_line + A] = get_bits(&s->gb, 8);
1157  left[R] = p->data[0][last_line + R] = get_bits(&s->gb, 8);
1158  left[G] = p->data[0][last_line + G] = get_bits(&s->gb, 8);
1159  left[B] = p->data[0][last_line + B] = get_bits(&s->gb, 8);
1160  } else {
1161  left[R] = p->data[0][last_line + R] = get_bits(&s->gb, 8);
1162  left[G] = p->data[0][last_line + G] = get_bits(&s->gb, 8);
1163  left[B] = p->data[0][last_line + B] = get_bits(&s->gb, 8);
1164  left[A] = p->data[0][last_line + A] = 255;
1165  skip_bits(&s->gb, 8);
1166  }
1167 
1168  if (s->bgr32) {
1169  switch (s->predictor) {
1170  case LEFT:
1171  case PLANE:
1172  decode_bgr_bitstream(s, width - 1);
1173  s->hdsp.add_hfyu_left_pred_bgr32(p->data[0] + last_line + 4,
1174  s->temp[0], width - 1, left);
1175 
1176  for (y = s->height - 2; y >= 0; y--) { // Yes it is stored upside down.
1177  decode_bgr_bitstream(s, width);
1178 
1179  s->hdsp.add_hfyu_left_pred_bgr32(p->data[0] + p->linesize[0] * y,
1180  s->temp[0], width, left);
1181  if (s->predictor == PLANE) {
1182  if (s->bitstream_bpp != 32)
1183  left[A] = 0;
1184  if ((y & s->interlaced) == 0 &&
1185  y < s->height - 1 - s->interlaced) {
1186  s->hdsp.add_bytes(p->data[0] + p->linesize[0] * y,
1187  p->data[0] + p->linesize[0] * y +
1188  fake_ystride, fake_ystride);
1189  }
1190  }
1191  }
1192  // just 1 large slice as this is not possible in reverse order
1193  draw_slice(s, p, height);
1194  break;
1195  default:
1196  av_log(avctx, AV_LOG_ERROR,
1197  "prediction type not supported!\n");
1198  }
1199  } else {
1200  av_log(avctx, AV_LOG_ERROR,
1201  "BGR24 output is not implemented yet\n");
1202  return AVERROR_PATCHWELCOME;
1203  }
1204  }
1205  emms_c();
1206 
1207  *got_frame = 1;
1208 
1209  return (get_bits_count(&s->gb) + 31) / 32 * 4 + table_size;
1210 }
1211 
1212 static av_cold int decode_end(AVCodecContext *avctx)
1213 {
1214  HYuvContext *s = avctx->priv_data;
1215  int i;
1216 
1217  ff_huffyuv_common_end(s);
1218  av_freep(&s->bitstream_buffer);
1219 
1220  for (i = 0; i < 8; i++)
1221  ff_free_vlc(&s->vlc[i]);
1222 
1223  return 0;
1224 }
1225 
1226 AVCodec ff_huffyuv_decoder = {
1227  .name = "huffyuv",
1228  .long_name = NULL_IF_CONFIG_SMALL("Huffyuv / HuffYUV"),
1229  .type = AVMEDIA_TYPE_VIDEO,
1230  .id = AV_CODEC_ID_HUFFYUV,
1231  .priv_data_size = sizeof(HYuvContext),
1232  .init = decode_init,
1233  .close = decode_end,
1234  .decode = decode_frame,
1235  .capabilities = CODEC_CAP_DR1 | CODEC_CAP_DRAW_HORIZ_BAND |
1236  CODEC_CAP_FRAME_THREADS,
1237  .init_thread_copy = ONLY_IF_THREADS_ENABLED(decode_init_thread_copy),
1238 };
1239 
1240 #if CONFIG_FFVHUFF_DECODER
1241 AVCodec ff_ffvhuff_decoder = {
1242  .name = "ffvhuff",
1243  .long_name = NULL_IF_CONFIG_SMALL("Huffyuv FFmpeg variant"),
1244  .type = AVMEDIA_TYPE_VIDEO,
1245  .id = AV_CODEC_ID_FFVHUFF,
1246  .priv_data_size = sizeof(HYuvContext),
1247  .init = decode_init,
1248  .close = decode_end,
1249  .decode = decode_frame,
1250  .capabilities = CODEC_CAP_DR1 | CODEC_CAP_DRAW_HORIZ_BAND |
1251  CODEC_CAP_FRAME_THREADS,
1252  .init_thread_copy = ONLY_IF_THREADS_ENABLED(decode_init_thread_copy),
1253 };
1254 #endif /* CONFIG_FFVHUFF_DECODER */
Generated on Sun Sep 14 2014 18:55:57 for FFmpeg by   doxygen 1.8.2