FFmpeg
ylc.c
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1 /*
2  * YUY2 Lossless Codec
3  *
4  * This file is part of FFmpeg.
5  *
6  * FFmpeg is free software; you can redistribute it and/or
7  * modify it under the terms of the GNU Lesser General Public
8  * License as published by the Free Software Foundation; either
9  * version 2.1 of the License, or (at your option) any later version.
10  *
11  * FFmpeg is distributed in the hope that it will be useful,
12  * but WITHOUT ANY WARRANTY; without even the implied warranty of
13  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
14  * Lesser General Public License for more details.
15  *
16  * You should have received a copy of the GNU Lesser General Public
17  * License along with FFmpeg; if not, write to the Free Software
18  * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
19  */
20 
21 #include <stdio.h>
22 #include <stdlib.h>
23 #include <string.h>
24 
25 #define YLC_VLC_BITS 10
26 
27 #include "libavutil/imgutils.h"
28 #include "libavutil/internal.h"
29 #include "libavutil/intreadwrite.h"
30 #include "libavutil/mem.h"
31 #include "avcodec.h"
32 #include "bswapdsp.h"
33 #include "get_bits.h"
34 #include "huffyuvdsp.h"
35 #include "internal.h"
36 #include "thread.h"
37 #include "unary.h"
38 
39 typedef struct YLCContext {
40  VLC vlc[4];
41  uint32_t table[1024];
42  uint8_t *table_bits;
43  uint8_t *bitstream_bits;
44  int table_bits_size;
45  int bitstream_bits_size;
46  BswapDSPContext bdsp;
47 } YLCContext;
48 
49 static av_cold int decode_init(AVCodecContext *avctx)
50 {
51  YLCContext *s = avctx->priv_data;
52 
53  avctx->pix_fmt = AV_PIX_FMT_YUYV422;
54  ff_bswapdsp_init(&s->bdsp);
55 
56  return 0;
57 }
58 
59 typedef struct Node {
60  int16_t sym;
61  int16_t n0;
62  uint32_t count;
63  int16_t l, r;
64 } Node;
65 
66 static void get_tree_codes(uint32_t *bits, int16_t *lens, uint8_t *xlat,
67  Node *nodes, int node,
68  uint32_t pfx, int pl, int *pos)
69 {
70  int s;
71 
72  s = nodes[node].sym;
73  if (s != -1) {
74  bits[*pos] = (~pfx) & ((1ULL << FFMAX(pl, 1)) - 1);
75  lens[*pos] = FFMAX(pl, 1);
76  xlat[*pos] = s + (pl == 0);
77  (*pos)++;
78  } else {
79  pfx <<= 1;
80  pl++;
81  get_tree_codes(bits, lens, xlat, nodes, nodes[node].l, pfx, pl,
82  pos);
83  pfx |= 1;
84  get_tree_codes(bits, lens, xlat, nodes, nodes[node].r, pfx, pl,
85  pos);
86  }
87 }
88 
89 static int build_vlc(AVCodecContext *avctx, VLC *vlc, const uint32_t *table)
90 {
91  Node nodes[512];
92  uint32_t bits[256];
93  int16_t lens[256];
94  uint8_t xlat[256];
95  int cur_node, i, j, pos = 0;
96 
97  ff_free_vlc(vlc);
98 
99  for (i = 0; i < 256; i++) {
100  nodes[i].count = table[i];
101  nodes[i].sym = i;
102  nodes[i].n0 = -2;
103  nodes[i].l = i;
104  nodes[i].r = i;
105  }
106 
107  cur_node = 256;
108  j = 0;
109  do {
110  for (i = 0; ; i++) {
111  int new_node = j;
112  int first_node = cur_node;
113  int second_node = cur_node;
114  unsigned nd, st;
115 
116  nodes[cur_node].count = -1;
117 
118  do {
119  int val = nodes[new_node].count;
120  if (val && (val < nodes[first_node].count)) {
121  if (val >= nodes[second_node].count) {
122  first_node = new_node;
123  } else {
124  first_node = second_node;
125  second_node = new_node;
126  }
127  }
128  new_node += 1;
129  } while (new_node != cur_node);
130 
131  if (first_node == cur_node)
132  break;
133 
134  nd = nodes[second_node].count;
135  st = nodes[first_node].count;
136  nodes[second_node].count = 0;
137  nodes[first_node].count = 0;
138  if (nd >= UINT32_MAX - st) {
139  av_log(avctx, AV_LOG_ERROR, "count overflow\n");
140  return AVERROR_INVALIDDATA;
141  }
142  nodes[cur_node].count = nd + st;
143  nodes[cur_node].sym = -1;
144  nodes[cur_node].n0 = cur_node;
145  nodes[cur_node].l = first_node;
146  nodes[cur_node].r = second_node;
147  cur_node++;
148  }
149  j++;
150  } while (cur_node - 256 == j);
151 
152  get_tree_codes(bits, lens, xlat, nodes, cur_node - 1, 0, 0, &pos);
153 
154  return ff_init_vlc_sparse(vlc, YLC_VLC_BITS, pos, lens, 2, 2,
155  bits, 4, 4, xlat, 1, 1, 0);
156 }
157 
158 static const uint8_t table_y1[] = {
159  0xFE, 0xFE, 0xFE, 0xFE, 0xFE, 0xFE, 0xFE, 0xFE,
160  0xFE, 0xFE, 0xFE, 0xFE, 0xFE, 0xFE, 0xFE, 0xFE,
161  0xFE, 0xFE, 0xFE, 0xFE, 0xFE, 0xFE, 0xFE, 0xFE,
162  0xFE, 0xFE, 0xFE, 0xFE, 0xFE, 0xFE, 0xFE, 0xFE,
163  0xFE, 0xFE, 0xFE, 0xFE, 0xFE, 0xFE, 0xFE, 0xFE,
164  0xFE, 0xFE, 0xFE, 0xFE, 0xFE, 0xFF, 0xFF, 0xFF,
165  0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF,
166  0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF,
167  0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF,
168  0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF,
169  0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF,
170  0xFF, 0xFF, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
171  0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
172  0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
173  0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
174  0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
175  0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x01,
176  0x01, 0x01, 0x01, 0x01, 0x01, 0x01, 0x01, 0x01,
177  0x01, 0x01, 0x01, 0x01, 0x01, 0x01, 0x01, 0x01,
178  0x01, 0x01, 0x01, 0x01, 0x01, 0x01, 0x01, 0x01,
179  0x01, 0x01, 0x01, 0x01, 0x01, 0x01, 0x01, 0x01,
180  0x01, 0x01, 0x01, 0x01, 0x01, 0x01, 0x01, 0x01,
181  0x01, 0x01, 0x01, 0x01, 0x02, 0x02, 0x02, 0x02,
182  0x02, 0x02, 0x02, 0x02, 0x02, 0x02, 0x02, 0x02,
183  0x02, 0x02, 0x02, 0x02, 0x02, 0x02, 0x02, 0x02,
184  0x02, 0x02, 0x02, 0x02, 0x02, 0x02, 0x02, 0x02,
185  0x02, 0x02, 0x02, 0x02, 0x02, 0x02, 0x02, 0x02,
186  0x02, 0x02, 0x02, 0x02, 0x02, 0x02, 0x02, 0x02,
187  0x02, 0x00,
188 };
189 
190 static const uint8_t table_u[] = {
191  0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF,
192  0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0x00,
193  0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
194  0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x01, 0x01,
195  0x01, 0x01, 0x01, 0x01, 0x01, 0x01, 0x01, 0x01,
196  0x01, 0x01, 0x01, 0x01, 0x01, 0xFF, 0xFF, 0xFF,
197  0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF,
198  0xFF, 0xFF, 0xFF, 0xFF, 0x00, 0x00, 0x00, 0x00,
199  0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
200  0x00, 0x00, 0x00, 0x01, 0x01, 0x01, 0x01, 0x01,
201  0x01, 0x01, 0x01, 0x01, 0x01, 0x01, 0x01, 0x01,
202  0x01, 0x01, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF,
203  0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF,
204  0xFF, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
205  0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
206  0x01, 0x01, 0x01, 0x01, 0x01, 0x01, 0x01, 0x01,
207  0x01, 0x01, 0x01, 0x01, 0x01, 0x01, 0x01, 0xFF,
208  0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF,
209  0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0x00, 0x00,
210  0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
211  0x00, 0x00, 0x00, 0x00, 0x00, 0x01, 0x01, 0x01,
212  0x01, 0x01, 0x01, 0x01, 0x01, 0x01, 0x01, 0x01,
213  0x01, 0x01, 0x01, 0x01, 0xFF, 0xFF, 0xFF, 0xFF,
214  0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF,
215  0xFF, 0xFF, 0xFF, 0x00, 0x00, 0x00, 0x00, 0x00,
216  0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
217  0x00, 0x00, 0x01, 0x01, 0x01, 0x01, 0x01, 0x01,
218  0x01, 0x01, 0x01, 0x01, 0x01, 0x01, 0x01, 0x01,
219  0x01, 0x00,
220 };
221 
222 static const uint8_t table_y2[] = {
223  0xFC, 0xFC, 0xFC, 0xFD, 0xFD, 0xFD, 0xFE, 0xFE,
224  0xFE, 0xFF, 0xFF, 0xFF, 0x00, 0x00, 0x00, 0xFC,
225  0xFC, 0xFC, 0xFD, 0xFD, 0xFD, 0xFE, 0xFE, 0xFE,
226  0xFF, 0xFF, 0xFF, 0x00, 0x00, 0x00, 0xFC, 0xFC,
227  0xFC, 0xFD, 0xFD, 0xFD, 0xFE, 0xFE, 0xFE, 0xFF,
228  0xFF, 0xFF, 0x00, 0x00, 0x00, 0xFD, 0xFD, 0xFD,
229  0xFE, 0xFE, 0xFE, 0xFF, 0xFF, 0xFF, 0x00, 0x00,
230  0x00, 0x01, 0x01, 0x01, 0xFD, 0xFD, 0xFD, 0xFE,
231  0xFE, 0xFE, 0xFF, 0xFF, 0xFF, 0x00, 0x00, 0x00,
232  0x01, 0x01, 0x01, 0xFD, 0xFD, 0xFD, 0xFE, 0xFE,
233  0xFE, 0xFF, 0xFF, 0xFF, 0x00, 0x00, 0x00, 0x01,
234  0x01, 0x01, 0xFE, 0xFE, 0xFE, 0xFF, 0xFF, 0xFF,
235  0x00, 0x00, 0x00, 0x01, 0x01, 0x01, 0x02, 0x02,
236  0x02, 0xFE, 0xFE, 0xFE, 0xFF, 0xFF, 0xFF, 0x00,
237  0x00, 0x00, 0x01, 0x01, 0x01, 0x02, 0x02, 0x02,
238  0xFE, 0xFE, 0xFE, 0xFF, 0xFF, 0xFF, 0x00, 0x00,
239  0x00, 0x01, 0x01, 0x01, 0x02, 0x02, 0x02, 0xFF,
240  0xFF, 0xFF, 0x00, 0x00, 0x00, 0x01, 0x01, 0x01,
241  0x02, 0x02, 0x02, 0x03, 0x03, 0x03, 0xFF, 0xFF,
242  0xFF, 0x00, 0x00, 0x00, 0x01, 0x01, 0x01, 0x02,
243  0x02, 0x02, 0x03, 0x03, 0x03, 0xFF, 0xFF, 0xFF,
244  0x00, 0x00, 0x00, 0x01, 0x01, 0x01, 0x02, 0x02,
245  0x02, 0x03, 0x03, 0x03, 0x00, 0x00, 0x00, 0x01,
246  0x01, 0x01, 0x02, 0x02, 0x02, 0x03, 0x03, 0x03,
247  0x04, 0x04, 0x04, 0x00, 0x00, 0x00, 0x01, 0x01,
248  0x01, 0x02, 0x02, 0x02, 0x03, 0x03, 0x03, 0x04,
249  0x04, 0x04, 0x00, 0x00, 0x00, 0x01, 0x01, 0x01,
250  0x02, 0x02, 0x02, 0x03, 0x03, 0x03, 0x04, 0x04,
251  0x04, 0x00,
252 };
253 
254 static const uint8_t table_v[] = {
255  0xFF, 0x00, 0x01, 0xFF, 0x00, 0x01, 0xFF, 0x00,
256  0x01, 0xFF, 0x00, 0x01, 0xFF, 0x00, 0x01, 0xFF,
257  0x00, 0x01, 0xFF, 0x00, 0x01, 0xFF, 0x00, 0x01,
258  0xFF, 0x00, 0x01, 0xFF, 0x00, 0x01, 0xFF, 0x00,
259  0x01, 0xFF, 0x00, 0x01, 0xFF, 0x00, 0x01, 0xFF,
260  0x00, 0x01, 0xFF, 0x00, 0x01, 0xFF, 0x00, 0x01,
261  0xFF, 0x00, 0x01, 0xFF, 0x00, 0x01, 0xFF, 0x00,
262  0x01, 0xFF, 0x00, 0x01, 0xFF, 0x00, 0x01, 0xFF,
263  0x00, 0x01, 0xFF, 0x00, 0x01, 0xFF, 0x00, 0x01,
264  0xFF, 0x00, 0x01, 0xFF, 0x00, 0x01, 0xFF, 0x00,
265  0x01, 0xFF, 0x00, 0x01, 0xFF, 0x00, 0x01, 0xFF,
266  0x00, 0x01, 0xFF, 0x00, 0x01, 0xFF, 0x00, 0x01,
267  0xFF, 0x00, 0x01, 0xFF, 0x00, 0x01, 0xFF, 0x00,
268  0x01, 0xFF, 0x00, 0x01, 0xFF, 0x00, 0x01, 0xFF,
269  0x00, 0x01, 0xFF, 0x00, 0x01, 0xFF, 0x00, 0x01,
270  0xFF, 0x00, 0x01, 0xFF, 0x00, 0x01, 0xFF, 0x00,
271  0x01, 0xFF, 0x00, 0x01, 0xFF, 0x00, 0x01, 0xFF,
272  0x00, 0x01, 0xFF, 0x00, 0x01, 0xFF, 0x00, 0x01,
273  0xFF, 0x00, 0x01, 0xFF, 0x00, 0x01, 0xFF, 0x00,
274  0x01, 0xFF, 0x00, 0x01, 0xFF, 0x00, 0x01, 0xFF,
275  0x00, 0x01, 0xFF, 0x00, 0x01, 0xFF, 0x00, 0x01,
276  0xFF, 0x00, 0x01, 0xFF, 0x00, 0x01, 0xFF, 0x00,
277  0x01, 0xFF, 0x00, 0x01, 0xFF, 0x00, 0x01, 0xFF,
278  0x00, 0x01, 0xFF, 0x00, 0x01, 0xFF, 0x00, 0x01,
279  0xFF, 0x00, 0x01, 0xFF, 0x00, 0x01, 0xFF, 0x00,
280  0x01, 0xFF, 0x00, 0x01, 0xFF, 0x00, 0x01, 0xFF,
281  0x00, 0x01, 0xFF, 0x00, 0x01, 0xFF, 0x00, 0x01,
282  0xFF, 0x00, 0x01, 0xFF, 0x00, 0x01, 0xFF, 0x00,
283  0x01, 0x00,
284 };
285 
286 static int decode_frame(AVCodecContext *avctx,
287  void *data, int *got_frame,
288  AVPacket *avpkt)
289 {
290  int TL[4] = { 128, 128, 128, 128 };
291  int L[4] = { 128, 128, 128, 128 };
292  YLCContext *s = avctx->priv_data;
293  ThreadFrame frame = { .f = data };
294  const uint8_t *buf = avpkt->data;
295  int ret, x, y, toffset, boffset;
296  AVFrame * const p = data;
297  GetBitContext gb;
298  uint8_t *dst;
299 
300  if (avpkt->size <= 16)
301  return AVERROR_INVALIDDATA;
302 
303  if (AV_RL32(buf) != MKTAG('Y', 'L', 'C', '0') ||
304  AV_RL32(buf + 4) != 0)
305  return AVERROR_INVALIDDATA;
306 
307  toffset = AV_RL32(buf + 8);
308  if (toffset < 16 || toffset >= avpkt->size)
309  return AVERROR_INVALIDDATA;
310 
311  boffset = AV_RL32(buf + 12);
312  if (toffset >= boffset || boffset >= avpkt->size)
313  return AVERROR_INVALIDDATA;
314 
315  if ((ret = ff_thread_get_buffer(avctx, &frame, 0)) < 0)
316  return ret;
317 
318  av_fast_malloc(&s->table_bits, &s->table_bits_size,
319  boffset - toffset + AV_INPUT_BUFFER_PADDING_SIZE);
320  if (!s->table_bits)
321  return AVERROR(ENOMEM);
322 
323  memcpy(s->table_bits, avpkt->data + toffset, boffset - toffset);
324  memset(s->table_bits + boffset - toffset, 0, AV_INPUT_BUFFER_PADDING_SIZE);
325  s->bdsp.bswap_buf((uint32_t *) s->table_bits,
326  (uint32_t *) s->table_bits,
327  (boffset - toffset + 3) >> 2);
328  if ((ret = init_get_bits8(&gb, s->table_bits, boffset - toffset)) < 0)
329  return ret;
330 
331  for (x = 0; x < 1024; x++) {
332  unsigned len = get_unary(&gb, 1, 31);
333  uint32_t val = ((1U << len) - 1) + get_bits_long(&gb, len);
334 
335  s->table[x] = val;
336  }
337 
338  ret = build_vlc(avctx, &s->vlc[0], &s->table[0 ]);
339  if (ret < 0)
340  return ret;
341  ret = build_vlc(avctx, &s->vlc[1], &s->table[256]);
342  if (ret < 0)
343  return ret;
344  ret = build_vlc(avctx, &s->vlc[2], &s->table[512]);
345  if (ret < 0)
346  return ret;
347  ret = build_vlc(avctx, &s->vlc[3], &s->table[768]);
348  if (ret < 0)
349  return ret;
350 
351  av_fast_malloc(&s->bitstream_bits, &s->bitstream_bits_size,
352  avpkt->size - boffset + AV_INPUT_BUFFER_PADDING_SIZE);
353  if (!s->bitstream_bits)
354  return AVERROR(ENOMEM);
355 
356  memcpy(s->bitstream_bits, avpkt->data + boffset, avpkt->size - boffset);
357  memset(s->bitstream_bits + avpkt->size - boffset, 0, AV_INPUT_BUFFER_PADDING_SIZE);
358  s->bdsp.bswap_buf((uint32_t *) s->bitstream_bits,
359  (uint32_t *) s->bitstream_bits,
360  (avpkt->size - boffset) >> 2);
361  if ((ret = init_get_bits8(&gb, s->bitstream_bits, avpkt->size - boffset)) < 0)
362  return ret;
363 
364  dst = p->data[0];
365  for (y = 0; y < avctx->height; y++) {
366  memset(dst, 0, avctx->width * 2);
367  dst += p->linesize[0];
368  }
369 
370  dst = p->data[0];
371  for (y = 0; y < avctx->height; y++) {
372  for (x = 0; x < avctx->width * 2 && y < avctx->height;) {
373  if (get_bits_left(&gb) <= 0)
374  return AVERROR_INVALIDDATA;
375 
376  if (get_bits1(&gb)) {
377  int val = get_vlc2(&gb, s->vlc[0].table, YLC_VLC_BITS, 3);
378  if (val < 0) {
379  return AVERROR_INVALIDDATA;
380  } else if (val < 0xE1) {
381  dst[x ] = table_y1[val];
382  dst[x + 1] = table_u[val];
383  dst[x + 2] = table_y2[val];
384  dst[x + 3] = table_v[val];
385  x += 4;
386  } else {
387  int incr = (val - 0xDF) * 4;
388  if (x + incr >= avctx->width * 2) {
389  int iy = ((x + incr) / (avctx->width * 2));
390  x = (x + incr) % (avctx->width * 2);
391  y += iy;
392  dst += iy * p->linesize[0];
393  } else {
394  x += incr;
395  }
396  }
397  } else {
398  int y1, y2, u, v;
399 
400  y1 = get_vlc2(&gb, s->vlc[1].table, YLC_VLC_BITS, 3);
401  u = get_vlc2(&gb, s->vlc[2].table, YLC_VLC_BITS, 3);
402  y2 = get_vlc2(&gb, s->vlc[1].table, YLC_VLC_BITS, 3);
403  v = get_vlc2(&gb, s->vlc[3].table, YLC_VLC_BITS, 3);
404  if (y1 < 0 || y2 < 0 || u < 0 || v < 0)
405  return AVERROR_INVALIDDATA;
406  dst[x ] = y1;
407  dst[x + 1] = u;
408  dst[x + 2] = y1 + y2;
409  dst[x + 3] = v;
410  x += 4;
411  }
412  }
413  dst += p->linesize[0];
414  }
415 
416  dst = p->data[0];
417  for (x = 0; x < avctx->width * 2; x += 4) {
418  dst[x ] = dst[x ] + L[0];
419  dst[x + 2] = L[0] = dst[x + 2] + L[0];
420  L[1] = dst[x + 1] + L[1];
421  dst[x + 1] = L[1];
422  L[2] = dst[x + 3] + L[2];
423  dst[x + 3] = L[2];
424  }
425  dst += p->linesize[0];
426 
427  for (y = 1; y < avctx->height; y++) {
428  x = 0;
429  dst[x ] = dst[x ] + L[0] + dst[x + 0 - p->linesize[0]] - TL[0];
430  dst[x + 2] = L[0] = dst[x + 2] + L[0] + dst[x + 2 - p->linesize[0]] - TL[0];
431  TL[0] = dst[x + 2 - p->linesize[0]];
432  L[1] = dst[x + 1] + L[1] + dst[x + 1 - p->linesize[0]] - TL[1];
433  dst[x + 1] = L[1];
434  TL[1] = dst[x + 1 - p->linesize[0]];
435  L[2] = dst[x + 3] + L[2] + dst[x + 3 - p->linesize[0]] - TL[2];
436  dst[x + 3] = L[2];
437  TL[2] = dst[x + 3 - p->linesize[0]];
438  for (x = 4; x < avctx->width * 2; x += 4) {
439  dst[x ] = dst[x ] + L[0] + dst[x + 0 - p->linesize[0]] - TL[0];
440  dst[x + 2] = L[0] = dst[x + 2] + L[0] + dst[x + 2 - p->linesize[0]] - TL[0];
441  TL[0] = dst[x + 2 - p->linesize[0]];
442  L[1] = dst[x + 1] + L[1] + dst[x + 1 - p->linesize[0]] - TL[1];
443  dst[x + 1] = L[1];
444  TL[1] = dst[x + 1 - p->linesize[0]];
445  L[2] = dst[x + 3] + L[2] + dst[x + 3 - p->linesize[0]] - TL[2];
446  dst[x + 3] = L[2];
447  TL[2] = dst[x + 3 - p->linesize[0]];
448  }
449  dst += p->linesize[0];
450  }
451 
452  p->pict_type = AV_PICTURE_TYPE_I;
453  p->key_frame = 1;
454  *got_frame = 1;
455 
456  return avpkt->size;
457 }
458 
459 static av_cold int decode_end(AVCodecContext *avctx)
460 {
461  YLCContext *s = avctx->priv_data;
462 
463  ff_free_vlc(&s->vlc[0]);
464  ff_free_vlc(&s->vlc[1]);
465  ff_free_vlc(&s->vlc[2]);
466  ff_free_vlc(&s->vlc[3]);
467  av_freep(&s->table_bits);
468  s->table_bits_size = 0;
469  av_freep(&s->bitstream_bits);
470  s->bitstream_bits_size = 0;
471 
472  return 0;
473 }
474 
475 AVCodec ff_ylc_decoder = {
476  .name = "ylc",
477  .long_name = NULL_IF_CONFIG_SMALL("YUY2 Lossless Codec"),
478  .type = AVMEDIA_TYPE_VIDEO,
479  .id = AV_CODEC_ID_YLC,
480  .priv_data_size = sizeof(YLCContext),
481  .init = decode_init,
482  .close = decode_end,
483  .decode = decode_frame,
484  .capabilities = AV_CODEC_CAP_DR1 | AV_CODEC_CAP_FRAME_THREADS,
485  .caps_internal = FF_CODEC_CAP_INIT_THREADSAFE,
486 };
AVERROR_INVALIDDATA
#define AVERROR_INVALIDDATA
Invalid data found when processing input.
Definition: error.h:59
AVFrame
This structure describes decoded (raw) audio or video data.
Definition: frame.h:308
YLCContext::table
uint32_t table[1024]
Definition: ylc.c:41
decode_init
static av_cold int decode_init(AVCodecContext *avctx)
Definition: ylc.c:49
data
ptrdiff_t const GLvoid * data
Definition: opengl_enc.c:100
table_y1
static const uint8_t table_y1[]
Definition: ylc.c:158
ret
ret
Definition: filter_design.txt:187
imgutils.h
misc image utilities
mem.h
Memory handling functions.
table_y2
static const uint8_t table_y2[]
Definition: ylc.c:222
init
static av_cold int init(AVCodecContext *avctx)
Definition: avrndec.c:35
ff_init_vlc_sparse
int ff_init_vlc_sparse(VLC *vlc_arg, int nb_bits, int nb_codes, const void *bits, int bits_wrap, int bits_size, const void *codes, int codes_wrap, int codes_size, const void *symbols, int symbols_wrap, int symbols_size, int flags)
Definition: bitstream.c:275
YLCContext::table_bits_size
int table_bits_size
Definition: ylc.c:44
AVPacket::size
int size
Definition: packet.h:364
AVCodecContext::pix_fmt
enum AVPixelFormat pix_fmt
Pixel format, see AV_PIX_FMT_xxx.
Definition: avcodec.h:736
table_u
static const uint8_t table_u[]
Definition: ylc.c:190
YLCContext
Definition: ylc.c:39
AVCodec
AVCodec.
Definition: codec.h:190
decode
static void decode(AVCodecContext *dec_ctx, AVPacket *pkt, AVFrame *frame, FILE *outfile)
Definition: decode_audio.c:71
Node
Definition: agm.c:913
table_v
static const uint8_t table_v[]
Definition: ylc.c:254
FF_CODEC_CAP_INIT_THREADSAFE
#define FF_CODEC_CAP_INIT_THREADSAFE
The codec does not modify any global variables in the init function, allowing to call the init functi...
Definition: internal.h:40
uint8_t
uint8_t
Definition: audio_convert.c:194
av_cold
#define av_cold
Definition: attributes.h:88
BswapDSPContext::bswap_buf
void(* bswap_buf)(uint32_t *dst, const uint32_t *src, int w)
Definition: bswapdsp.h:25
thread.h
Multithreading support functions.
u
#define u(width, name, range_min, range_max)
Definition: cbs_h2645.c:262
decode_end
static av_cold int decode_end(AVCodecContext *avctx)
Definition: ylc.c:459
AVPacket::data
uint8_t * data
Definition: packet.h:363
get_bits.h
bitstream reader API header.
av_log
#define av_log(a,...)
Definition: tableprint_vlc.h:28
YLCContext::table_bits
uint8_t * table_bits
Definition: ylc.c:42
U
#define U(x)
Definition: vp56_arith.h:37
decode_frame
static int decode_frame(AVCodecContext *avctx, void *data, int *got_frame, AVPacket *avpkt)
Definition: ylc.c:286
get_bits_left
static int get_bits_left(GetBitContext *gb)
Definition: get_bits.h:849
AV_LOG_ERROR
#define AV_LOG_ERROR
Something went wrong and cannot losslessly be recovered.
Definition: log.h:194
AV_CODEC_ID_YLC
Definition: codec_id.h:268
NULL_IF_CONFIG_SMALL
#define NULL_IF_CONFIG_SMALL(x)
Return NULL if CONFIG_SMALL is true, otherwise the argument without modification. ...
Definition: internal.h:153
YLCContext::vlc
VLC vlc[4]
Definition: ylc.c:40
r
const char * r
Definition: vf_curves.c:114
pos
unsigned int pos
Definition: spdifenc.c:410
YLCContext::bitstream_bits
uint8_t * bitstream_bits
Definition: ylc.c:43
AVCodec::name
const char * name
Name of the codec implementation.
Definition: codec.h:197
bits
uint8_t bits
Definition: vp3data.h:202
count
GLsizei count
Definition: opengl_enc.c:108
FFMAX
#define FFMAX(a, b)
Definition: common.h:94
AV_CODEC_CAP_FRAME_THREADS
#define AV_CODEC_CAP_FRAME_THREADS
Codec supports frame-level multithreading.
Definition: codec.h:106
VLC
Definition: vlc.h:26
Node::r
int16_t r
Definition: mvha.c:53
ff_thread_get_buffer
the pkt_dts and pkt_pts fields in AVFrame will work as usual Restrictions on codec whose streams don t reset across will not work because their bitstreams cannot be decoded in parallel *The contents of buffers must not be read before as well as code calling up to before the decode process starts Call have so the codec calls ff_thread_report set FF_CODEC_CAP_ALLOCATE_PROGRESS in AVCodec caps_internal and use ff_thread_get_buffer() to allocate frames.The frames must then be freed with ff_thread_release_buffer().Otherwise decode directly into the user-supplied frames.Call ff_thread_report_progress() after some part of the current picture has decoded.A good place to put this is where draw_horiz_band() is called-add this if it isn't called anywhere
get_tree_codes
static void get_tree_codes(uint32_t *bits, int16_t *lens, uint8_t *xlat, Node *nodes, int node, uint32_t pfx, int pl, int *pos)
Definition: ylc.c:66
av_fast_malloc
void av_fast_malloc(void *ptr, unsigned int *size, size_t min_size)
Allocate a buffer, reusing the given one if large enough.
Definition: mem.c:502
internal.h
common internal API header
AV_PICTURE_TYPE_I
Intra.
Definition: avutil.h:274
AVFrame::pict_type
enum AVPictureType pict_type
Picture type of the frame.
Definition: frame.h:391
Node::l
int16_t l
Definition: mvha.c:53
AVCodecContext::width
int width
picture width / height.
Definition: avcodec.h:699
frame
these buffered frames must be flushed immediately if a new input produces new the filter must not call request_frame to get more It must just process the frame or queue it The task of requesting more frames is left to the filter s request_frame method or the application If a filter has several the filter must be ready for frames arriving randomly on any input any filter with several inputs will most likely require some kind of queuing mechanism It is perfectly acceptable to have a limited queue and to drop frames when the inputs are too unbalanced request_frame For filters that do not use the this method is called when a frame is wanted on an output For a it should directly call filter_frame on the corresponding output For a if there are queued frames already one of these frames should be pushed If the filter should request a frame on one of its repeatedly until at least one frame has been pushed Return or at least make progress towards producing a frame
Definition: filter_design.txt:255
s
#define s(width, name)
Definition: cbs_vp9.c:257
get_vlc2
static av_always_inline int get_vlc2(GetBitContext *s, VLC_TYPE(*table)[2], int bits, int max_depth)
Parse a vlc code.
Definition: get_bits.h:797
L
#define L(x)
Definition: vp56_arith.h:36
avcodec.h
Libavcodec external API header.
AVFrame::linesize
int linesize[AV_NUM_DATA_POINTERS]
For video, size in bytes of each picture line.
Definition: frame.h:339
init_get_bits8
static int init_get_bits8(GetBitContext *s, const uint8_t *buffer, int byte_size)
Initialize GetBitContext.
Definition: get_bits.h:677
AVCodecContext
main external API structure.
Definition: avcodec.h:526
AV_PIX_FMT_YUYV422
packed YUV 4:2:2, 16bpp, Y0 Cb Y1 Cr
Definition: pixfmt.h:67
get_bits1
static unsigned int get_bits1(GetBitContext *s)
Definition: get_bits.h:498
Node::n0
int16_t n0
Definition: huffman.h:34
Node::sym
int16_t sym
Definition: huffman.h:33
get_bits_long
static unsigned int get_bits_long(GetBitContext *s, int n)
Read 0-32 bits.
Definition: get_bits.h:546
AVFrame::data
uint8_t * data[AV_NUM_DATA_POINTERS]
pointer to the picture/channel planes.
Definition: frame.h:322
YLCContext::bdsp
BswapDSPContext bdsp
Definition: ylc.c:46
internal.h
common internal api header.
get_unary
static int get_unary(GetBitContext *gb, int stop, int len)
Get unary code of limited length.
Definition: unary.h:46
AV_INPUT_BUFFER_PADDING_SIZE
#define AV_INPUT_BUFFER_PADDING_SIZE
Required number of additionally allocated bytes at the end of the input bitstream for decoding...
Definition: avcodec.h:215
ff_bswapdsp_init
av_cold void ff_bswapdsp_init(BswapDSPContext *c)
Definition: bswapdsp.c:49
AVCodecContext::priv_data
void * priv_data
Definition: avcodec.h:553
len
int len
Definition: vorbis_enc_data.h:452
VLC::table
VLC_TYPE(* table)[2]
code, bits
Definition: vlc.h:28
AVFrame::key_frame
int key_frame
1 -> keyframe, 0-> not
Definition: frame.h:386
Node::count
uint32_t count
Definition: huffman.h:35
YLCContext::bitstream_bits_size
int bitstream_bits_size
Definition: ylc.c:45
av_freep
#define av_freep(p)
Definition: tableprint_vlc.h:35
AVMEDIA_TYPE_VIDEO
Definition: avutil.h:201
AVERROR
Filter the word “frame” indicates either a video frame or a group of audio as stored in an AVFrame structure Format for each input and each output the list of supported formats For video that means pixel format For audio that means channel sample they are references to shared objects When the negotiation mechanism computes the intersection of the formats supported at each end of a all references to both lists are replaced with a reference to the intersection And when a single format is eventually chosen for a link amongst the remaining all references to the list are updated That means that if a filter requires that its input and output have the same format amongst a supported all it has to do is use a reference to the same list of formats query_formats can leave some formats unset and return AVERROR(EAGAIN) to cause the negotiation mechanism toagain later.That can be used by filters with complex requirements to use the format negotiated on one link to set the formats supported on another.Frame references ownership and permissions
MKTAG
#define MKTAG(a, b, c, d)
Definition: common.h:405
ff_ylc_decoder
AVCodec ff_ylc_decoder
Definition: ylc.c:475
AV_RL32
uint64_t_TMPL AV_WL64 unsigned int_TMPL AV_RL32
Definition: bytestream.h:91
build_vlc
static int build_vlc(AVCodecContext *avctx, VLC *vlc, const uint32_t *table)
Definition: ylc.c:89
val
static double val(void *priv, double ch)
Definition: aeval.c:76
AVPacket
This structure stores compressed data.
Definition: packet.h:340
ff_free_vlc
void ff_free_vlc(VLC *vlc)
Definition: bitstream.c:365
AV_CODEC_CAP_DR1
#define AV_CODEC_CAP_DR1
Codec uses get_buffer() for allocating buffers and supports custom allocators.
Definition: codec.h:50
i
int i
Definition: input.c:407
YLC_VLC_BITS
#define YLC_VLC_BITS
Definition: ylc.c:25
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