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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 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 
26 /**
27  * @file
28  * huffyuv decoder
29  */
30 
31 #include "avcodec.h"
32 #include "dsputil.h"
33 #include "get_bits.h"
34 #include "huffyuv.h"
35 #include "thread.h"
36 
37 #define classic_shift_luma_table_size 42
38 static const unsigned char classic_shift_luma[classic_shift_luma_table_size + FF_INPUT_BUFFER_PADDING_SIZE] = {
39  34,36,35,69,135,232,9,16,10,24,11,23,12,16,13,10,14,8,15,8,
40  16,8,17,20,16,10,207,206,205,236,11,8,10,21,9,23,8,8,199,70,
41  69,68, 0,
42  0,0,0,0,0,0,0,0,
43 };
44 
45 #define classic_shift_chroma_table_size 59
46 static const unsigned char classic_shift_chroma[classic_shift_chroma_table_size + FF_INPUT_BUFFER_PADDING_SIZE] = {
47  66,36,37,38,39,40,41,75,76,77,110,239,144,81,82,83,84,85,118,183,
48  56,57,88,89,56,89,154,57,58,57,26,141,57,56,58,57,58,57,184,119,
49  214,245,116,83,82,49,80,79,78,77,44,75,41,40,39,38,37,36,34, 0,
50  0,0,0,0,0,0,0,0,
51 };
52 
53 static const unsigned char classic_add_luma[256] = {
54  3, 9, 5, 12, 10, 35, 32, 29, 27, 50, 48, 45, 44, 41, 39, 37,
55  73, 70, 68, 65, 64, 61, 58, 56, 53, 50, 49, 46, 44, 41, 38, 36,
56  68, 65, 63, 61, 58, 55, 53, 51, 48, 46, 45, 43, 41, 39, 38, 36,
57  35, 33, 32, 30, 29, 27, 26, 25, 48, 47, 46, 44, 43, 41, 40, 39,
58  37, 36, 35, 34, 32, 31, 30, 28, 27, 26, 24, 23, 22, 20, 19, 37,
59  35, 34, 33, 31, 30, 29, 27, 26, 24, 23, 21, 20, 18, 17, 15, 29,
60  27, 26, 24, 22, 21, 19, 17, 16, 14, 26, 25, 23, 21, 19, 18, 16,
61  15, 27, 25, 23, 21, 19, 17, 16, 14, 26, 25, 23, 21, 18, 17, 14,
62  12, 17, 19, 13, 4, 9, 2, 11, 1, 7, 8, 0, 16, 3, 14, 6,
63  12, 10, 5, 15, 18, 11, 10, 13, 15, 16, 19, 20, 22, 24, 27, 15,
64  18, 20, 22, 24, 26, 14, 17, 20, 22, 24, 27, 15, 18, 20, 23, 25,
65  28, 16, 19, 22, 25, 28, 32, 36, 21, 25, 29, 33, 38, 42, 45, 49,
66  28, 31, 34, 37, 40, 42, 44, 47, 49, 50, 52, 54, 56, 57, 59, 60,
67  62, 64, 66, 67, 69, 35, 37, 39, 40, 42, 43, 45, 47, 48, 51, 52,
68  54, 55, 57, 59, 60, 62, 63, 66, 67, 69, 71, 72, 38, 40, 42, 43,
69  46, 47, 49, 51, 26, 28, 30, 31, 33, 34, 18, 19, 11, 13, 7, 8,
70 };
71 
72 static const unsigned char classic_add_chroma[256] = {
73  3, 1, 2, 2, 2, 2, 3, 3, 7, 5, 7, 5, 8, 6, 11, 9,
74  7, 13, 11, 10, 9, 8, 7, 5, 9, 7, 6, 4, 7, 5, 8, 7,
75  11, 8, 13, 11, 19, 15, 22, 23, 20, 33, 32, 28, 27, 29, 51, 77,
76  43, 45, 76, 81, 46, 82, 75, 55, 56,144, 58, 80, 60, 74,147, 63,
77  143, 65, 66, 67, 68, 69, 70, 71, 72, 73, 74, 75, 76, 77, 78, 79,
78  80, 81, 82, 83, 84, 85, 86, 87, 88, 89, 90, 91, 27, 30, 21, 22,
79  17, 14, 5, 6,100, 54, 47, 50, 51, 53,106,107,108,109,110,111,
80  112,113,114,115, 4,117,118, 92, 94,121,122, 3,124,103, 2, 1,
81  0,129,130,131,120,119,126,125,136,137,138,139,140,141,142,134,
82  135,132,133,104, 64,101, 62, 57,102, 95, 93, 59, 61, 28, 97, 96,
83  52, 49, 48, 29, 32, 25, 24, 46, 23, 98, 45, 44, 43, 20, 42, 41,
84  19, 18, 99, 40, 15, 39, 38, 16, 13, 12, 11, 37, 10, 9, 8, 36,
85  7,128,127,105,123,116, 35, 34, 33,145, 31, 79, 42,146, 78, 26,
86  83, 48, 49, 50, 44, 47, 26, 31, 30, 18, 17, 19, 21, 24, 25, 13,
87  14, 16, 17, 18, 20, 21, 12, 14, 15, 9, 10, 6, 9, 6, 5, 8,
88  6, 12, 8, 10, 7, 9, 6, 4, 6, 2, 2, 3, 3, 3, 3, 2,
89 };
90 
91 static int read_len_table(uint8_t *dst, GetBitContext *gb)
92 {
93  int i, val, repeat;
94 
95  for (i = 0; i < 256;) {
96  repeat = get_bits(gb, 3);
97  val = get_bits(gb, 5);
98  if (repeat == 0)
99  repeat = get_bits(gb, 8);
100  if (i + repeat > 256 || get_bits_left(gb) < 0) {
101  av_log(NULL, AV_LOG_ERROR, "Error reading huffman table\n");
102  return -1;
103  }
104  while (repeat--)
105  dst[i++] = val;
106  }
107  return 0;
108 }
109 
110 static void generate_joint_tables(HYuvContext *s)
111 {
112  uint16_t symbols[1 << VLC_BITS];
113  uint16_t bits[1 << VLC_BITS];
114  uint8_t len[1 << VLC_BITS];
115  if (s->bitstream_bpp < 24) {
116  int p, i, y, u;
117  for (p = 0; p < 3; p++) {
118  for (i = y = 0; y < 256; y++) {
119  int len0 = s->len[0][y];
120  int limit = VLC_BITS - len0;
121  if(limit <= 0 || !len0)
122  continue;
123  for (u = 0; u < 256; u++) {
124  int len1 = s->len[p][u];
125  if (len1 > limit || !len1)
126  continue;
127  av_assert0(i < (1 << VLC_BITS));
128  len[i] = len0 + len1;
129  bits[i] = (s->bits[0][y] << len1) + s->bits[p][u];
130  symbols[i] = (y << 8) + u;
131  if(symbols[i] != 0xffff) // reserved to mean "invalid"
132  i++;
133  }
134  }
135  ff_free_vlc(&s->vlc[3 + p]);
136  ff_init_vlc_sparse(&s->vlc[3 + p], VLC_BITS, i, len, 1, 1,
137  bits, 2, 2, symbols, 2, 2, 0);
138  }
139  } else {
140  uint8_t (*map)[4] = (uint8_t(*)[4])s->pix_bgr_map;
141  int i, b, g, r, code;
142  int p0 = s->decorrelate;
143  int p1 = !s->decorrelate;
144  // restrict the range to +/-16 because that's pretty much guaranteed to
145  // cover all the combinations that fit in 11 bits total, and it doesn't
146  // matter if we miss a few rare codes.
147  for (i = 0, g = -16; g < 16; g++) {
148  int len0 = s->len[p0][g & 255];
149  int limit0 = VLC_BITS - len0;
150  if (limit0 < 2 || !len0)
151  continue;
152  for (b = -16; b < 16; b++) {
153  int len1 = s->len[p1][b & 255];
154  int limit1 = limit0 - len1;
155  if (limit1 < 1 || !len1)
156  continue;
157  code = (s->bits[p0][g & 255] << len1) + s->bits[p1][b & 255];
158  for (r = -16; r < 16; r++) {
159  int len2 = s->len[2][r & 255];
160  if (len2 > limit1 || !len2)
161  continue;
162  av_assert0(i < (1 << VLC_BITS));
163  len[i] = len0 + len1 + len2;
164  bits[i] = (code << len2) + s->bits[2][r & 255];
165  if (s->decorrelate) {
166  map[i][G] = g;
167  map[i][B] = g + b;
168  map[i][R] = g + r;
169  } else {
170  map[i][B] = g;
171  map[i][G] = b;
172  map[i][R] = r;
173  }
174  i++;
175  }
176  }
177  }
178  ff_free_vlc(&s->vlc[3]);
179  init_vlc(&s->vlc[3], VLC_BITS, i, len, 1, 1, bits, 2, 2, 0);
180  }
181 }
182 
183 static int read_huffman_tables(HYuvContext *s, const uint8_t *src, int length)
184 {
185  GetBitContext gb;
186  int i;
187  int ret;
188 
189  init_get_bits(&gb, src, length * 8);
190 
191  for (i = 0; i < 3; i++) {
192  if (read_len_table(s->len[i], &gb) < 0)
193  return -1;
194  if (ff_huffyuv_generate_bits_table(s->bits[i], s->len[i]) < 0) {
195  return -1;
196  }
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  generate_joint_tables(s);
204 
205  return (get_bits_count(&gb) + 7) / 8;
206 }
207 
208 static int read_old_huffman_tables(HYuvContext *s)
209 {
210  GetBitContext gb;
211  int i;
212  int ret;
213 
214  init_get_bits(&gb, classic_shift_luma,
215  classic_shift_luma_table_size * 8);
216  if (read_len_table(s->len[0], &gb) < 0)
217  return -1;
218 
219  init_get_bits(&gb, classic_shift_chroma,
220  classic_shift_chroma_table_size * 8);
221  if (read_len_table(s->len[1], &gb) < 0)
222  return -1;
223 
224  for(i=0; i<256; i++) s->bits[0][i] = classic_add_luma [i];
225  for(i=0; i<256; i++) s->bits[1][i] = classic_add_chroma[i];
226 
227  if (s->bitstream_bpp >= 24) {
228  memcpy(s->bits[1], s->bits[0], 256 * sizeof(uint32_t));
229  memcpy(s->len[1] , s->len [0], 256 * sizeof(uint8_t));
230  }
231  memcpy(s->bits[2], s->bits[1], 256 * sizeof(uint32_t));
232  memcpy(s->len[2] , s->len [1], 256 * sizeof(uint8_t));
233 
234  for (i = 0; i < 3; i++) {
235  ff_free_vlc(&s->vlc[i]);
236  if ((ret = init_vlc(&s->vlc[i], VLC_BITS, 256, s->len[i], 1, 1,
237  s->bits[i], 4, 4, 0)) < 0)
238  return ret;
239  }
240 
241  generate_joint_tables(s);
242 
243  return 0;
244 }
245 
246 static av_cold int decode_init(AVCodecContext *avctx)
247 {
248  HYuvContext *s = avctx->priv_data;
249 
250  ff_huffyuv_common_init(avctx);
251  memset(s->vlc, 0, 3 * sizeof(VLC));
252 
253  avctx->coded_frame = &s->picture;
254  avcodec_get_frame_defaults(&s->picture);
255  s->interlaced = s->height > 288;
256 
257  s->bgr32 = 1;
258 
259  if (avctx->extradata_size) {
260  if ((avctx->bits_per_coded_sample & 7) &&
261  avctx->bits_per_coded_sample != 12)
262  s->version = 1; // do such files exist at all?
263  else
264  s->version = 2;
265  } else
266  s->version = 0;
267 
268  if (s->version == 2) {
269  int method, interlace;
270 
271  if (avctx->extradata_size < 4)
272  return -1;
273 
274  method = ((uint8_t*)avctx->extradata)[0];
275  s->decorrelate = method & 64 ? 1 : 0;
276  s->predictor = method & 63;
277  s->bitstream_bpp = ((uint8_t*)avctx->extradata)[1];
278  if (s->bitstream_bpp == 0)
279  s->bitstream_bpp = avctx->bits_per_coded_sample & ~7;
280  interlace = (((uint8_t*)avctx->extradata)[2] & 0x30) >> 4;
281  s->interlaced = (interlace == 1) ? 1 : (interlace == 2) ? 0 : s->interlaced;
282  s->context = ((uint8_t*)avctx->extradata)[2] & 0x40 ? 1 : 0;
283 
284  if ( read_huffman_tables(s, ((uint8_t*)avctx->extradata) + 4,
285  avctx->extradata_size - 4) < 0)
286  return AVERROR_INVALIDDATA;
287  }else{
288  switch (avctx->bits_per_coded_sample & 7) {
289  case 1:
290  s->predictor = LEFT;
291  s->decorrelate = 0;
292  break;
293  case 2:
294  s->predictor = LEFT;
295  s->decorrelate = 1;
296  break;
297  case 3:
298  s->predictor = PLANE;
299  s->decorrelate = avctx->bits_per_coded_sample >= 24;
300  break;
301  case 4:
302  s->predictor = MEDIAN;
303  s->decorrelate = 0;
304  break;
305  default:
306  s->predictor = LEFT; //OLD
307  s->decorrelate = 0;
308  break;
309  }
310  s->bitstream_bpp = avctx->bits_per_coded_sample & ~7;
311  s->context = 0;
312 
313  if (read_old_huffman_tables(s) < 0)
314  return AVERROR_INVALIDDATA;
315  }
316 
317  switch (s->bitstream_bpp) {
318  case 12:
319  avctx->pix_fmt = AV_PIX_FMT_YUV420P;
320  break;
321  case 16:
322  if (s->yuy2) {
323  avctx->pix_fmt = AV_PIX_FMT_YUYV422;
324  } else {
325  avctx->pix_fmt = AV_PIX_FMT_YUV422P;
326  }
327  break;
328  case 24:
329  case 32:
330  if (s->bgr32) {
331  avctx->pix_fmt = AV_PIX_FMT_RGB32;
332  } else {
333  avctx->pix_fmt = AV_PIX_FMT_BGR24;
334  }
335  break;
336  default:
337  return AVERROR_INVALIDDATA;
338  }
339 
340  if ((avctx->pix_fmt == AV_PIX_FMT_YUV422P || avctx->pix_fmt == AV_PIX_FMT_YUV420P) && avctx->width & 1) {
341  av_log(avctx, AV_LOG_ERROR, "width must be even for this colorspace\n");
342  return AVERROR_INVALIDDATA;
343  }
344  if (s->predictor == MEDIAN && avctx->pix_fmt == AV_PIX_FMT_YUV422P && avctx->width%4) {
345  av_log(avctx, AV_LOG_ERROR, "width must be a multiple of 4 this colorspace and predictor\n");
346  return AVERROR_INVALIDDATA;
347  }
348  if (ff_huffyuv_alloc_temp(s)) {
349  ff_huffyuv_common_end(s);
350  return AVERROR(ENOMEM);
351  }
352 
353  return 0;
354 }
355 
356 static av_cold int decode_init_thread_copy(AVCodecContext *avctx)
357 {
358  HYuvContext *s = avctx->priv_data;
359  int i;
360 
361  avctx->coded_frame= &s->picture;
362  if (ff_huffyuv_alloc_temp(s)) {
363  ff_huffyuv_common_end(s);
364  return AVERROR(ENOMEM);
365  }
366 
367  for (i = 0; i < 6; i++)
368  s->vlc[i].table = NULL;
369 
370  if (s->version == 2) {
371  if (read_huffman_tables(s, ((uint8_t*)avctx->extradata) + 4,
372  avctx->extradata_size) < 0)
373  return AVERROR_INVALIDDATA;
374  } else {
375  if (read_old_huffman_tables(s) < 0)
376  return AVERROR_INVALIDDATA;
377  }
378 
379  return 0;
380 }
381 
382 /* TODO instead of restarting the read when the code isn't in the first level
383  * of the joint table, jump into the 2nd level of the individual table. */
384 #define READ_2PIX(dst0, dst1, plane1){\
385  uint16_t code = get_vlc2(&s->gb, s->vlc[3+plane1].table, VLC_BITS, 1);\
386  if(code != 0xffff){\
387  dst0 = code>>8;\
388  dst1 = code;\
389  }else{\
390  dst0 = get_vlc2(&s->gb, s->vlc[0].table, VLC_BITS, 3);\
391  dst1 = get_vlc2(&s->gb, s->vlc[plane1].table, VLC_BITS, 3);\
392  }\
393 }
394 
395 static void decode_422_bitstream(HYuvContext *s, int count)
396 {
397  int i;
398 
399  count /= 2;
400 
401  if (count >= (get_bits_left(&s->gb)) / (31 * 4)) {
402  for (i = 0; i < count && get_bits_left(&s->gb) > 0; i++) {
403  READ_2PIX(s->temp[0][2 * i ], s->temp[1][i], 1);
404  READ_2PIX(s->temp[0][2 * i + 1], s->temp[2][i], 2);
405  }
406  } else {
407  for (i = 0; i < count; i++) {
408  READ_2PIX(s->temp[0][2 * i ], s->temp[1][i], 1);
409  READ_2PIX(s->temp[0][2 * i + 1], s->temp[2][i], 2);
410  }
411  }
412 }
413 
414 static void decode_gray_bitstream(HYuvContext *s, int count)
415 {
416  int i;
417 
418  count/=2;
419 
420  if (count >= (get_bits_left(&s->gb)) / (31 * 2)) {
421  for (i = 0; i < count && get_bits_left(&s->gb) > 0; i++) {
422  READ_2PIX(s->temp[0][2 * i], s->temp[0][2 * i + 1], 0);
423  }
424  } else {
425  for(i=0; i<count; i++){
426  READ_2PIX(s->temp[0][2 * i], s->temp[0][2 * i + 1], 0);
427  }
428  }
429 }
430 
431 static av_always_inline void decode_bgr_1(HYuvContext *s, int count,
432  int decorrelate, int alpha)
433 {
434  int i;
435  for (i = 0; i < count; i++) {
436  int code = get_vlc2(&s->gb, s->vlc[3].table, VLC_BITS, 1);
437  if (code != -1) {
438  *(uint32_t*)&s->temp[0][4 * i] = s->pix_bgr_map[code];
439  } else if(decorrelate) {
440  s->temp[0][4 * i + G] = get_vlc2(&s->gb, s->vlc[1].table, VLC_BITS, 3);
441  s->temp[0][4 * i + B] = get_vlc2(&s->gb, s->vlc[0].table, VLC_BITS, 3) +
442  s->temp[0][4 * i + G];
443  s->temp[0][4 * i + R] = get_vlc2(&s->gb, s->vlc[2].table, VLC_BITS, 3) +
444  s->temp[0][4 * i + G];
445  } else {
446  s->temp[0][4 * i + B] = get_vlc2(&s->gb, s->vlc[0].table, VLC_BITS, 3);
447  s->temp[0][4 * i + G] = get_vlc2(&s->gb, s->vlc[1].table, VLC_BITS, 3);
448  s->temp[0][4 * i + R] = get_vlc2(&s->gb, s->vlc[2].table, VLC_BITS, 3);
449  }
450  if (alpha)
451  s->temp[0][4 * i + A] = get_vlc2(&s->gb, s->vlc[2].table, VLC_BITS, 3);
452  }
453 }
454 
455 static void decode_bgr_bitstream(HYuvContext *s, int count)
456 {
457  if (s->decorrelate) {
458  if (s->bitstream_bpp==24)
459  decode_bgr_1(s, count, 1, 0);
460  else
461  decode_bgr_1(s, count, 1, 1);
462  } else {
463  if (s->bitstream_bpp==24)
464  decode_bgr_1(s, count, 0, 0);
465  else
466  decode_bgr_1(s, count, 0, 1);
467  }
468 }
469 
470 static void draw_slice(HYuvContext *s, int y)
471 {
472  int h, cy, i;
473  int offset[AV_NUM_DATA_POINTERS];
474 
475  if (s->avctx->draw_horiz_band==NULL)
476  return;
477 
478  h = y - s->last_slice_end;
479  y -= h;
480 
481  if (s->bitstream_bpp == 12) {
482  cy = y>>1;
483  } else {
484  cy = y;
485  }
486 
487  offset[0] = s->picture.linesize[0]*y;
488  offset[1] = s->picture.linesize[1]*cy;
489  offset[2] = s->picture.linesize[2]*cy;
490  for (i = 3; i < AV_NUM_DATA_POINTERS; i++)
491  offset[i] = 0;
492  emms_c();
493 
494  s->avctx->draw_horiz_band(s->avctx, &s->picture, offset, y, 3, h);
495 
496  s->last_slice_end = y + h;
497 }
498 
499 static int decode_frame(AVCodecContext *avctx, void *data, int *got_frame,
500  AVPacket *avpkt)
501 {
502  const uint8_t *buf = avpkt->data;
503  int buf_size = avpkt->size;
504  HYuvContext *s = avctx->priv_data;
505  const int width = s->width;
506  const int width2 = s->width>>1;
507  const int height = s->height;
508  int fake_ystride, fake_ustride, fake_vstride;
509  AVFrame * const p = &s->picture;
510  int table_size = 0, ret;
511 
512  AVFrame *picture = data;
513 
514  av_fast_padded_malloc(&s->bitstream_buffer,
515  &s->bitstream_buffer_size,
516  buf_size);
517  if (!s->bitstream_buffer)
518  return AVERROR(ENOMEM);
519 
520  s->dsp.bswap_buf((uint32_t*)s->bitstream_buffer,
521  (const uint32_t*)buf, buf_size / 4);
522 
523  if (p->data[0])
524  ff_thread_release_buffer(avctx, p);
525 
526  p->reference = 0;
527  if ((ret = ff_thread_get_buffer(avctx, p)) < 0) {
528  av_log(avctx, AV_LOG_ERROR, "get_buffer() failed\n");
529  return ret;
530  }
531 
532  if (s->context) {
533  table_size = read_huffman_tables(s, s->bitstream_buffer, buf_size);
534  if (table_size < 0)
535  return AVERROR_INVALIDDATA;
536  }
537 
538  if ((unsigned)(buf_size-table_size) >= INT_MAX / 8)
539  return AVERROR_INVALIDDATA;
540 
541  init_get_bits(&s->gb, s->bitstream_buffer+table_size,
542  (buf_size-table_size) * 8);
543 
544  fake_ystride = s->interlaced ? p->linesize[0] * 2 : p->linesize[0];
545  fake_ustride = s->interlaced ? p->linesize[1] * 2 : p->linesize[1];
546  fake_vstride = s->interlaced ? p->linesize[2] * 2 : p->linesize[2];
547 
548  s->last_slice_end = 0;
549 
550  if (s->bitstream_bpp < 24) {
551  int y, cy;
552  int lefty, leftu, leftv;
553  int lefttopy, lefttopu, lefttopv;
554 
555  if (s->yuy2) {
556  p->data[0][3] = get_bits(&s->gb, 8);
557  p->data[0][2] = get_bits(&s->gb, 8);
558  p->data[0][1] = get_bits(&s->gb, 8);
559  p->data[0][0] = get_bits(&s->gb, 8);
560 
561  av_log(avctx, AV_LOG_ERROR,
562  "YUY2 output is not implemented yet\n");
563  return AVERROR_PATCHWELCOME;
564  } else {
565 
566  leftv = p->data[2][0] = get_bits(&s->gb, 8);
567  lefty = p->data[0][1] = get_bits(&s->gb, 8);
568  leftu = p->data[1][0] = get_bits(&s->gb, 8);
569  p->data[0][0] = get_bits(&s->gb, 8);
570 
571  switch (s->predictor) {
572  case LEFT:
573  case PLANE:
574  decode_422_bitstream(s, width-2);
575  lefty = s->dsp.add_hfyu_left_prediction(p->data[0] + 2, s->temp[0], width-2, lefty);
576  if (!(s->flags&CODEC_FLAG_GRAY)) {
577  leftu = s->dsp.add_hfyu_left_prediction(p->data[1] + 1, s->temp[1], width2 - 1, leftu);
578  leftv = s->dsp.add_hfyu_left_prediction(p->data[2] + 1, s->temp[2], width2 - 1, leftv);
579  }
580 
581  for (cy = y = 1; y < s->height; y++, cy++) {
582  uint8_t *ydst, *udst, *vdst;
583 
584  if (s->bitstream_bpp == 12) {
585  decode_gray_bitstream(s, width);
586 
587  ydst = p->data[0] + p->linesize[0] * y;
588 
589  lefty = s->dsp.add_hfyu_left_prediction(ydst, s->temp[0], width, lefty);
590  if (s->predictor == PLANE) {
591  if (y > s->interlaced)
592  s->dsp.add_bytes(ydst, ydst - fake_ystride, width);
593  }
594  y++;
595  if (y >= s->height) break;
596  }
597 
598  draw_slice(s, y);
599 
600  ydst = p->data[0] + p->linesize[0]*y;
601  udst = p->data[1] + p->linesize[1]*cy;
602  vdst = p->data[2] + p->linesize[2]*cy;
603 
604  decode_422_bitstream(s, width);
605  lefty = s->dsp.add_hfyu_left_prediction(ydst, s->temp[0], width, lefty);
606  if (!(s->flags & CODEC_FLAG_GRAY)) {
607  leftu= s->dsp.add_hfyu_left_prediction(udst, s->temp[1], width2, leftu);
608  leftv= s->dsp.add_hfyu_left_prediction(vdst, s->temp[2], width2, leftv);
609  }
610  if (s->predictor == PLANE) {
611  if (cy > s->interlaced) {
612  s->dsp.add_bytes(ydst, ydst - fake_ystride, width);
613  if (!(s->flags & CODEC_FLAG_GRAY)) {
614  s->dsp.add_bytes(udst, udst - fake_ustride, width2);
615  s->dsp.add_bytes(vdst, vdst - fake_vstride, width2);
616  }
617  }
618  }
619  }
620  draw_slice(s, height);
621 
622  break;
623  case MEDIAN:
624  /* first line except first 2 pixels is left predicted */
625  decode_422_bitstream(s, width - 2);
626  lefty= s->dsp.add_hfyu_left_prediction(p->data[0] + 2, s->temp[0], width - 2, lefty);
627  if (!(s->flags & CODEC_FLAG_GRAY)) {
628  leftu = s->dsp.add_hfyu_left_prediction(p->data[1] + 1, s->temp[1], width2 - 1, leftu);
629  leftv = s->dsp.add_hfyu_left_prediction(p->data[2] + 1, s->temp[2], width2 - 1, leftv);
630  }
631 
632  cy = y = 1;
633 
634  /* second line is left predicted for interlaced case */
635  if (s->interlaced) {
636  decode_422_bitstream(s, width);
637  lefty = s->dsp.add_hfyu_left_prediction(p->data[0] + p->linesize[0], s->temp[0], width, lefty);
638  if (!(s->flags & CODEC_FLAG_GRAY)) {
639  leftu = s->dsp.add_hfyu_left_prediction(p->data[1] + p->linesize[2], s->temp[1], width2, leftu);
640  leftv = s->dsp.add_hfyu_left_prediction(p->data[2] + p->linesize[1], s->temp[2], width2, leftv);
641  }
642  y++; cy++;
643  }
644 
645  /* next 4 pixels are left predicted too */
646  decode_422_bitstream(s, 4);
647  lefty = s->dsp.add_hfyu_left_prediction(p->data[0] + fake_ystride, s->temp[0], 4, lefty);
648  if (!(s->flags&CODEC_FLAG_GRAY)) {
649  leftu = s->dsp.add_hfyu_left_prediction(p->data[1] + fake_ustride, s->temp[1], 2, leftu);
650  leftv = s->dsp.add_hfyu_left_prediction(p->data[2] + fake_vstride, s->temp[2], 2, leftv);
651  }
652 
653  /* next line except the first 4 pixels is median predicted */
654  lefttopy = p->data[0][3];
655  decode_422_bitstream(s, width - 4);
656  s->dsp.add_hfyu_median_prediction(p->data[0] + fake_ystride+4, p->data[0]+4, s->temp[0], width-4, &lefty, &lefttopy);
657  if (!(s->flags&CODEC_FLAG_GRAY)) {
658  lefttopu = p->data[1][1];
659  lefttopv = p->data[2][1];
660  s->dsp.add_hfyu_median_prediction(p->data[1] + fake_ustride+2, p->data[1] + 2, s->temp[1], width2 - 2, &leftu, &lefttopu);
661  s->dsp.add_hfyu_median_prediction(p->data[2] + fake_vstride+2, p->data[2] + 2, s->temp[2], width2 - 2, &leftv, &lefttopv);
662  }
663  y++; cy++;
664 
665  for (; y<height; y++, cy++) {
666  uint8_t *ydst, *udst, *vdst;
667 
668  if (s->bitstream_bpp == 12) {
669  while (2 * cy > y) {
670  decode_gray_bitstream(s, width);
671  ydst = p->data[0] + p->linesize[0] * y;
672  s->dsp.add_hfyu_median_prediction(ydst, ydst - fake_ystride, s->temp[0], width, &lefty, &lefttopy);
673  y++;
674  }
675  if (y >= height) break;
676  }
677  draw_slice(s, y);
678 
679  decode_422_bitstream(s, width);
680 
681  ydst = p->data[0] + p->linesize[0] * y;
682  udst = p->data[1] + p->linesize[1] * cy;
683  vdst = p->data[2] + p->linesize[2] * cy;
684 
685  s->dsp.add_hfyu_median_prediction(ydst, ydst - fake_ystride, s->temp[0], width, &lefty, &lefttopy);
686  if (!(s->flags & CODEC_FLAG_GRAY)) {
687  s->dsp.add_hfyu_median_prediction(udst, udst - fake_ustride, s->temp[1], width2, &leftu, &lefttopu);
688  s->dsp.add_hfyu_median_prediction(vdst, vdst - fake_vstride, s->temp[2], width2, &leftv, &lefttopv);
689  }
690  }
691 
692  draw_slice(s, height);
693  break;
694  }
695  }
696  } else {
697  int y;
698  int leftr, leftg, leftb, lefta;
699  const int last_line = (height - 1) * p->linesize[0];
700 
701  if (s->bitstream_bpp == 32) {
702  lefta = p->data[0][last_line+A] = get_bits(&s->gb, 8);
703  leftr = p->data[0][last_line+R] = get_bits(&s->gb, 8);
704  leftg = p->data[0][last_line+G] = get_bits(&s->gb, 8);
705  leftb = p->data[0][last_line+B] = get_bits(&s->gb, 8);
706  } else {
707  leftr = p->data[0][last_line+R] = get_bits(&s->gb, 8);
708  leftg = p->data[0][last_line+G] = get_bits(&s->gb, 8);
709  leftb = p->data[0][last_line+B] = get_bits(&s->gb, 8);
710  lefta = p->data[0][last_line+A] = 255;
711  skip_bits(&s->gb, 8);
712  }
713 
714  if (s->bgr32) {
715  switch (s->predictor) {
716  case LEFT:
717  case PLANE:
718  decode_bgr_bitstream(s, width - 1);
719  s->dsp.add_hfyu_left_prediction_bgr32(p->data[0] + last_line+4, s->temp[0], width - 1, &leftr, &leftg, &leftb, &lefta);
720 
721  for (y = s->height - 2; y >= 0; y--) { //Yes it is stored upside down.
722  decode_bgr_bitstream(s, width);
723 
724  s->dsp.add_hfyu_left_prediction_bgr32(p->data[0] + p->linesize[0]*y, s->temp[0], width, &leftr, &leftg, &leftb, &lefta);
725  if (s->predictor == PLANE) {
726  if (s->bitstream_bpp != 32) lefta = 0;
727  if ((y & s->interlaced) == 0 &&
728  y < s->height - 1 - s->interlaced) {
729  s->dsp.add_bytes(p->data[0] + p->linesize[0] * y,
730  p->data[0] + p->linesize[0] * y +
731  fake_ystride, fake_ystride);
732  }
733  }
734  }
735  // just 1 large slice as this is not possible in reverse order
736  draw_slice(s, height);
737  break;
738  default:
739  av_log(avctx, AV_LOG_ERROR,
740  "prediction type not supported!\n");
741  }
742  }else{
743  av_log(avctx, AV_LOG_ERROR,
744  "BGR24 output is not implemented yet\n");
745  return AVERROR_PATCHWELCOME;
746  }
747  }
748  emms_c();
749 
750  *picture = *p;
751  *got_frame = 1;
752 
753  return (get_bits_count(&s->gb) + 31) / 32 * 4 + table_size;
754 }
755 
756 static av_cold int decode_end(AVCodecContext *avctx)
757 {
758  HYuvContext *s = avctx->priv_data;
759  int i;
760 
761  if (s->picture.data[0])
762  avctx->release_buffer(avctx, &s->picture);
763 
764  ff_huffyuv_common_end(s);
765  av_freep(&s->bitstream_buffer);
766 
767  for (i = 0; i < 6; i++) {
768  ff_free_vlc(&s->vlc[i]);
769  }
770 
771  return 0;
772 }
773 
774 #if CONFIG_HUFFYUV_DECODER
775 AVCodec ff_huffyuv_decoder = {
776  .name = "huffyuv",
777  .type = AVMEDIA_TYPE_VIDEO,
778  .id = AV_CODEC_ID_HUFFYUV,
779  .priv_data_size = sizeof(HYuvContext),
780  .init = decode_init,
781  .close = decode_end,
782  .decode = decode_frame,
783  .capabilities = CODEC_CAP_DR1 | CODEC_CAP_DRAW_HORIZ_BAND |
784  CODEC_CAP_FRAME_THREADS,
785  .init_thread_copy = ONLY_IF_THREADS_ENABLED(decode_init_thread_copy),
786  .long_name = NULL_IF_CONFIG_SMALL("Huffyuv / HuffYUV"),
787 };
788 #endif
789 
790 #if CONFIG_FFVHUFF_DECODER
791 AVCodec ff_ffvhuff_decoder = {
792  .name = "ffvhuff",
793  .type = AVMEDIA_TYPE_VIDEO,
794  .id = AV_CODEC_ID_FFVHUFF,
795  .priv_data_size = sizeof(HYuvContext),
796  .init = decode_init,
797  .close = decode_end,
798  .decode = decode_frame,
799  .capabilities = CODEC_CAP_DR1 | CODEC_CAP_DRAW_HORIZ_BAND |
800  CODEC_CAP_FRAME_THREADS,
801  .init_thread_copy = ONLY_IF_THREADS_ENABLED(decode_init_thread_copy),
802  .long_name = NULL_IF_CONFIG_SMALL("Huffyuv FFmpeg variant"),
803 };
804 #endif
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