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 #include "libavutil/imgutils.h"
26 #include "libavutil/internal.h"
27 #include "libavutil/intreadwrite.h"
28 #include "libavutil/mem.h"
29 #include "avcodec.h"
30 #include "bswapdsp.h"
31 #include "get_bits.h"
32 #include "huffyuvdsp.h"
33 #include "internal.h"
34 #include "thread.h"
35 #include "unary.h"
36 
37 typedef struct YLCContext {
38  VLC vlc[4];
39  uint32_t table[1024];
40  uint8_t *table_bits;
41  uint8_t *bitstream_bits;
42  int table_bits_size;
43  int bitstream_bits_size;
44  BswapDSPContext bdsp;
45 } YLCContext;
46 
47 static av_cold int decode_init(AVCodecContext *avctx)
48 {
49  YLCContext *s = avctx->priv_data;
50 
51  avctx->pix_fmt = AV_PIX_FMT_YUYV422;
52  ff_bswapdsp_init(&s->bdsp);
53 
54  return 0;
55 }
56 
57 typedef struct Node {
58  int16_t sym;
59  int16_t n0;
60  uint32_t count;
61  int16_t l, r;
62 } Node;
63 
64 static void get_tree_codes(uint32_t *bits, int16_t *lens, uint8_t *xlat,
65  Node *nodes, int node,
66  uint32_t pfx, int pl, int *pos)
67 {
68  int s;
69 
70  s = nodes[node].sym;
71  if (s != -1) {
72  bits[*pos] = (~pfx) & ((1ULL << FFMAX(pl, 1)) - 1);
73  lens[*pos] = FFMAX(pl, 1);
74  xlat[*pos] = s + (pl == 0);
75  (*pos)++;
76  } else {
77  pfx <<= 1;
78  pl++;
79  get_tree_codes(bits, lens, xlat, nodes, nodes[node].l, pfx, pl,
80  pos);
81  pfx |= 1;
82  get_tree_codes(bits, lens, xlat, nodes, nodes[node].r, pfx, pl,
83  pos);
84  }
85 }
86 
87 static int build_vlc(AVCodecContext *avctx, VLC *vlc, const uint32_t *table)
88 {
89  Node nodes[512];
90  uint32_t bits[256];
91  int16_t lens[256];
92  uint8_t xlat[256];
93  int cur_node, i, j, pos = 0;
94 
95  ff_free_vlc(vlc);
96 
97  for (i = 0; i < 256; i++) {
98  nodes[i].count = table[i];
99  nodes[i].sym = i;
100  nodes[i].n0 = -2;
101  nodes[i].l = i;
102  nodes[i].r = i;
103  }
104 
105  cur_node = 256;
106  j = 0;
107  do {
108  for (i = 0; ; i++) {
109  int new_node = j;
110  int first_node = cur_node;
111  int second_node = cur_node;
112  unsigned nd, st;
113 
114  nodes[cur_node].count = -1;
115 
116  do {
117  int val = nodes[new_node].count;
118  if (val && (val < nodes[first_node].count)) {
119  if (val >= nodes[second_node].count) {
120  first_node = new_node;
121  } else {
122  first_node = second_node;
123  second_node = new_node;
124  }
125  }
126  new_node += 1;
127  } while (new_node != cur_node);
128 
129  if (first_node == cur_node)
130  break;
131 
132  nd = nodes[second_node].count;
133  st = nodes[first_node].count;
134  nodes[second_node].count = 0;
135  nodes[first_node].count = 0;
136  if (nd >= UINT32_MAX - st) {
137  av_log(avctx, AV_LOG_ERROR, "count overflow\n");
138  return AVERROR_INVALIDDATA;
139  }
140  nodes[cur_node].count = nd + st;
141  nodes[cur_node].sym = -1;
142  nodes[cur_node].n0 = cur_node;
143  nodes[cur_node].l = first_node;
144  nodes[cur_node].r = second_node;
145  cur_node++;
146  }
147  j++;
148  } while (cur_node - 256 == j);
149 
150  get_tree_codes(bits, lens, xlat, nodes, cur_node - 1, 0, 0, &pos);
151 
152  return ff_init_vlc_sparse(vlc, 10, pos, lens, 2, 2, bits, 4, 4, xlat, 1, 1, 0);
153 }
154 
155 static const uint8_t table_y1[] = {
156  0xFE, 0xFE, 0xFE, 0xFE, 0xFE, 0xFE, 0xFE, 0xFE,
157  0xFE, 0xFE, 0xFE, 0xFE, 0xFE, 0xFE, 0xFE, 0xFE,
158  0xFE, 0xFE, 0xFE, 0xFE, 0xFE, 0xFE, 0xFE, 0xFE,
159  0xFE, 0xFE, 0xFE, 0xFE, 0xFE, 0xFE, 0xFE, 0xFE,
160  0xFE, 0xFE, 0xFE, 0xFE, 0xFE, 0xFE, 0xFE, 0xFE,
161  0xFE, 0xFE, 0xFE, 0xFE, 0xFE, 0xFF, 0xFF, 0xFF,
162  0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF,
163  0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF,
164  0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF,
165  0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF,
166  0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF,
167  0xFF, 0xFF, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
168  0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
169  0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
170  0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
171  0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
172  0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x01,
173  0x01, 0x01, 0x01, 0x01, 0x01, 0x01, 0x01, 0x01,
174  0x01, 0x01, 0x01, 0x01, 0x01, 0x01, 0x01, 0x01,
175  0x01, 0x01, 0x01, 0x01, 0x01, 0x01, 0x01, 0x01,
176  0x01, 0x01, 0x01, 0x01, 0x01, 0x01, 0x01, 0x01,
177  0x01, 0x01, 0x01, 0x01, 0x01, 0x01, 0x01, 0x01,
178  0x01, 0x01, 0x01, 0x01, 0x02, 0x02, 0x02, 0x02,
179  0x02, 0x02, 0x02, 0x02, 0x02, 0x02, 0x02, 0x02,
180  0x02, 0x02, 0x02, 0x02, 0x02, 0x02, 0x02, 0x02,
181  0x02, 0x02, 0x02, 0x02, 0x02, 0x02, 0x02, 0x02,
182  0x02, 0x02, 0x02, 0x02, 0x02, 0x02, 0x02, 0x02,
183  0x02, 0x02, 0x02, 0x02, 0x02, 0x02, 0x02, 0x02,
184  0x02, 0x00,
185 };
186 
187 static const uint8_t table_u[] = {
188  0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF,
189  0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0x00,
190  0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
191  0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x01, 0x01,
192  0x01, 0x01, 0x01, 0x01, 0x01, 0x01, 0x01, 0x01,
193  0x01, 0x01, 0x01, 0x01, 0x01, 0xFF, 0xFF, 0xFF,
194  0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF,
195  0xFF, 0xFF, 0xFF, 0xFF, 0x00, 0x00, 0x00, 0x00,
196  0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
197  0x00, 0x00, 0x00, 0x01, 0x01, 0x01, 0x01, 0x01,
198  0x01, 0x01, 0x01, 0x01, 0x01, 0x01, 0x01, 0x01,
199  0x01, 0x01, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF,
200  0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF,
201  0xFF, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
202  0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
203  0x01, 0x01, 0x01, 0x01, 0x01, 0x01, 0x01, 0x01,
204  0x01, 0x01, 0x01, 0x01, 0x01, 0x01, 0x01, 0xFF,
205  0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF,
206  0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0x00, 0x00,
207  0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
208  0x00, 0x00, 0x00, 0x00, 0x00, 0x01, 0x01, 0x01,
209  0x01, 0x01, 0x01, 0x01, 0x01, 0x01, 0x01, 0x01,
210  0x01, 0x01, 0x01, 0x01, 0xFF, 0xFF, 0xFF, 0xFF,
211  0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF,
212  0xFF, 0xFF, 0xFF, 0x00, 0x00, 0x00, 0x00, 0x00,
213  0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
214  0x00, 0x00, 0x01, 0x01, 0x01, 0x01, 0x01, 0x01,
215  0x01, 0x01, 0x01, 0x01, 0x01, 0x01, 0x01, 0x01,
216  0x01, 0x00,
217 };
218 
219 static const uint8_t table_y2[] = {
220  0xFC, 0xFC, 0xFC, 0xFD, 0xFD, 0xFD, 0xFE, 0xFE,
221  0xFE, 0xFF, 0xFF, 0xFF, 0x00, 0x00, 0x00, 0xFC,
222  0xFC, 0xFC, 0xFD, 0xFD, 0xFD, 0xFE, 0xFE, 0xFE,
223  0xFF, 0xFF, 0xFF, 0x00, 0x00, 0x00, 0xFC, 0xFC,
224  0xFC, 0xFD, 0xFD, 0xFD, 0xFE, 0xFE, 0xFE, 0xFF,
225  0xFF, 0xFF, 0x00, 0x00, 0x00, 0xFD, 0xFD, 0xFD,
226  0xFE, 0xFE, 0xFE, 0xFF, 0xFF, 0xFF, 0x00, 0x00,
227  0x00, 0x01, 0x01, 0x01, 0xFD, 0xFD, 0xFD, 0xFE,
228  0xFE, 0xFE, 0xFF, 0xFF, 0xFF, 0x00, 0x00, 0x00,
229  0x01, 0x01, 0x01, 0xFD, 0xFD, 0xFD, 0xFE, 0xFE,
230  0xFE, 0xFF, 0xFF, 0xFF, 0x00, 0x00, 0x00, 0x01,
231  0x01, 0x01, 0xFE, 0xFE, 0xFE, 0xFF, 0xFF, 0xFF,
232  0x00, 0x00, 0x00, 0x01, 0x01, 0x01, 0x02, 0x02,
233  0x02, 0xFE, 0xFE, 0xFE, 0xFF, 0xFF, 0xFF, 0x00,
234  0x00, 0x00, 0x01, 0x01, 0x01, 0x02, 0x02, 0x02,
235  0xFE, 0xFE, 0xFE, 0xFF, 0xFF, 0xFF, 0x00, 0x00,
236  0x00, 0x01, 0x01, 0x01, 0x02, 0x02, 0x02, 0xFF,
237  0xFF, 0xFF, 0x00, 0x00, 0x00, 0x01, 0x01, 0x01,
238  0x02, 0x02, 0x02, 0x03, 0x03, 0x03, 0xFF, 0xFF,
239  0xFF, 0x00, 0x00, 0x00, 0x01, 0x01, 0x01, 0x02,
240  0x02, 0x02, 0x03, 0x03, 0x03, 0xFF, 0xFF, 0xFF,
241  0x00, 0x00, 0x00, 0x01, 0x01, 0x01, 0x02, 0x02,
242  0x02, 0x03, 0x03, 0x03, 0x00, 0x00, 0x00, 0x01,
243  0x01, 0x01, 0x02, 0x02, 0x02, 0x03, 0x03, 0x03,
244  0x04, 0x04, 0x04, 0x00, 0x00, 0x00, 0x01, 0x01,
245  0x01, 0x02, 0x02, 0x02, 0x03, 0x03, 0x03, 0x04,
246  0x04, 0x04, 0x00, 0x00, 0x00, 0x01, 0x01, 0x01,
247  0x02, 0x02, 0x02, 0x03, 0x03, 0x03, 0x04, 0x04,
248  0x04, 0x00,
249 };
250 
251 static const uint8_t table_v[] = {
252  0xFF, 0x00, 0x01, 0xFF, 0x00, 0x01, 0xFF, 0x00,
253  0x01, 0xFF, 0x00, 0x01, 0xFF, 0x00, 0x01, 0xFF,
254  0x00, 0x01, 0xFF, 0x00, 0x01, 0xFF, 0x00, 0x01,
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, 0x00,
281 };
282 
283 static int decode_frame(AVCodecContext *avctx,
284  void *data, int *got_frame,
285  AVPacket *avpkt)
286 {
287  int TL[4] = { 128, 128, 128, 128 };
288  int L[4] = { 128, 128, 128, 128 };
289  YLCContext *s = avctx->priv_data;
290  ThreadFrame frame = { .f = data };
291  const uint8_t *buf = avpkt->data;
292  int ret, x, y, toffset, boffset;
293  AVFrame * const p = data;
294  GetBitContext gb;
295  uint8_t *dst;
296 
297  if (avpkt->size <= 16)
298  return AVERROR_INVALIDDATA;
299 
300  if (AV_RL32(buf) != MKTAG('Y', 'L', 'C', '0') ||
301  AV_RL32(buf + 4) != 0)
302  return AVERROR_INVALIDDATA;
303 
304  toffset = AV_RL32(buf + 8);
305  if (toffset < 16 || toffset >= avpkt->size)
306  return AVERROR_INVALIDDATA;
307 
308  boffset = AV_RL32(buf + 12);
309  if (toffset >= boffset || boffset >= avpkt->size)
310  return AVERROR_INVALIDDATA;
311 
312  if ((ret = ff_thread_get_buffer(avctx, &frame, 0)) < 0)
313  return ret;
314 
315  av_fast_malloc(&s->table_bits, &s->table_bits_size,
316  boffset - toffset + AV_INPUT_BUFFER_PADDING_SIZE);
317  if (!s->table_bits)
318  return AVERROR(ENOMEM);
319 
320  memcpy(s->table_bits, avpkt->data + toffset, boffset - toffset);
321  memset(s->table_bits + boffset - toffset, 0, AV_INPUT_BUFFER_PADDING_SIZE);
322  s->bdsp.bswap_buf((uint32_t *) s->table_bits,
323  (uint32_t *) s->table_bits,
324  (boffset - toffset + 3) >> 2);
325  if ((ret = init_get_bits8(&gb, s->table_bits, boffset - toffset)) < 0)
326  return ret;
327 
328  for (x = 0; x < 1024; x++) {
329  unsigned len = get_unary(&gb, 1, 31);
330  uint32_t val = ((1U << len) - 1) + get_bits_long(&gb, len);
331 
332  s->table[x] = val;
333  }
334 
335  ret = build_vlc(avctx, &s->vlc[0], &s->table[0 ]);
336  if (ret < 0)
337  return ret;
338  ret = build_vlc(avctx, &s->vlc[1], &s->table[256]);
339  if (ret < 0)
340  return ret;
341  ret = build_vlc(avctx, &s->vlc[2], &s->table[512]);
342  if (ret < 0)
343  return ret;
344  ret = build_vlc(avctx, &s->vlc[3], &s->table[768]);
345  if (ret < 0)
346  return ret;
347 
348  av_fast_malloc(&s->bitstream_bits, &s->bitstream_bits_size,
349  avpkt->size - boffset + AV_INPUT_BUFFER_PADDING_SIZE);
350  if (!s->bitstream_bits)
351  return AVERROR(ENOMEM);
352 
353  memcpy(s->bitstream_bits, avpkt->data + boffset, avpkt->size - boffset);
354  memset(s->bitstream_bits + avpkt->size - boffset, 0, AV_INPUT_BUFFER_PADDING_SIZE);
355  s->bdsp.bswap_buf((uint32_t *) s->bitstream_bits,
356  (uint32_t *) s->bitstream_bits,
357  (avpkt->size - boffset) >> 2);
358  if ((ret = init_get_bits8(&gb, s->bitstream_bits, avpkt->size - boffset)) < 0)
359  return ret;
360 
361  dst = p->data[0];
362  for (y = 0; y < avctx->height; y++) {
363  memset(dst, 0, avctx->width * 2);
364  dst += p->linesize[0];
365  }
366 
367  dst = p->data[0];
368  for (y = 0; y < avctx->height; y++) {
369  for (x = 0; x < avctx->width * 2 && y < avctx->height;) {
370  if (get_bits_left(&gb) <= 0)
371  return AVERROR_INVALIDDATA;
372 
373  if (get_bits1(&gb)) {
374  int val = get_vlc2(&gb, s->vlc[0].table, s->vlc[0].bits, 3);
375  if (val < 0) {
376  return AVERROR_INVALIDDATA;
377  } else if (val < 0xE1) {
378  dst[x ] = table_y1[val];
379  dst[x + 1] = table_u[val];
380  dst[x + 2] = table_y2[val];
381  dst[x + 3] = table_v[val];
382  x += 4;
383  } else {
384  int incr = (val - 0xDF) * 4;
385  if (x + incr >= avctx->width * 2) {
386  int iy = ((x + incr) / (avctx->width * 2));
387  x = (x + incr) % (avctx->width * 2);
388  y += iy;
389  dst += iy * p->linesize[0];
390  } else {
391  x += incr;
392  }
393  }
394  } else {
395  int y1, y2, u, v;
396 
397  y1 = get_vlc2(&gb, s->vlc[1].table, s->vlc[1].bits, 3);
398  u = get_vlc2(&gb, s->vlc[2].table, s->vlc[2].bits, 3);
399  y2 = get_vlc2(&gb, s->vlc[1].table, s->vlc[1].bits, 3);
400  v = get_vlc2(&gb, s->vlc[3].table, s->vlc[3].bits, 3);
401  if (y1 < 0 || y2 < 0 || u < 0 || v < 0)
402  return AVERROR_INVALIDDATA;
403  dst[x ] = y1;
404  dst[x + 1] = u;
405  dst[x + 2] = y1 + y2;
406  dst[x + 3] = v;
407  x += 4;
408  }
409  }
410  dst += p->linesize[0];
411  }
412 
413  dst = p->data[0];
414  for (x = 0; x < avctx->width * 2; x += 4) {
415  dst[x ] = dst[x ] + L[0];
416  dst[x + 2] = L[0] = dst[x + 2] + L[0];
417  L[1] = dst[x + 1] + L[1];
418  dst[x + 1] = L[1];
419  L[2] = dst[x + 3] + L[2];
420  dst[x + 3] = L[2];
421  }
422  dst += p->linesize[0];
423 
424  for (y = 1; y < avctx->height; y++) {
425  x = 0;
426  dst[x ] = dst[x ] + L[0] + dst[x + 0 - p->linesize[0]] - TL[0];
427  dst[x + 2] = L[0] = dst[x + 2] + L[0] + dst[x + 2 - p->linesize[0]] - TL[0];
428  TL[0] = dst[x + 2 - p->linesize[0]];
429  L[1] = dst[x + 1] + L[1] + dst[x + 1 - p->linesize[0]] - TL[1];
430  dst[x + 1] = L[1];
431  TL[1] = dst[x + 1 - p->linesize[0]];
432  L[2] = dst[x + 3] + L[2] + dst[x + 3 - p->linesize[0]] - TL[2];
433  dst[x + 3] = L[2];
434  TL[2] = dst[x + 3 - p->linesize[0]];
435  for (x = 4; x < avctx->width * 2; x += 4) {
436  dst[x ] = dst[x ] + L[0] + dst[x + 0 - p->linesize[0]] - TL[0];
437  dst[x + 2] = L[0] = dst[x + 2] + L[0] + dst[x + 2 - p->linesize[0]] - TL[0];
438  TL[0] = dst[x + 2 - p->linesize[0]];
439  L[1] = dst[x + 1] + L[1] + dst[x + 1 - p->linesize[0]] - TL[1];
440  dst[x + 1] = L[1];
441  TL[1] = dst[x + 1 - p->linesize[0]];
442  L[2] = dst[x + 3] + L[2] + dst[x + 3 - p->linesize[0]] - TL[2];
443  dst[x + 3] = L[2];
444  TL[2] = dst[x + 3 - p->linesize[0]];
445  }
446  dst += p->linesize[0];
447  }
448 
449  p->pict_type = AV_PICTURE_TYPE_I;
450  p->key_frame = 1;
451  *got_frame = 1;
452 
453  return avpkt->size;
454 }
455 
456 static av_cold int decode_end(AVCodecContext *avctx)
457 {
458  YLCContext *s = avctx->priv_data;
459 
460  ff_free_vlc(&s->vlc[0]);
461  ff_free_vlc(&s->vlc[1]);
462  ff_free_vlc(&s->vlc[2]);
463  ff_free_vlc(&s->vlc[3]);
464  av_freep(&s->table_bits);
465  s->table_bits_size = 0;
466  av_freep(&s->bitstream_bits);
467  s->bitstream_bits_size = 0;
468 
469  return 0;
470 }
471 
472 AVCodec ff_ylc_decoder = {
473  .name = "ylc",
474  .long_name = NULL_IF_CONFIG_SMALL("YUY2 Lossless Codec"),
475  .type = AVMEDIA_TYPE_VIDEO,
476  .id = AV_CODEC_ID_YLC,
477  .priv_data_size = sizeof(YLCContext),
478  .init = decode_init,
479  .close = decode_end,
480  .decode = decode_frame,
481  .capabilities = AV_CODEC_CAP_DR1 | AV_CODEC_CAP_FRAME_THREADS,
482  .caps_internal = FF_CODEC_CAP_INIT_THREADSAFE,
483 };
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:39
decode_init
static av_cold int decode_init(AVCodecContext *avctx)
Definition: ylc.c:47
data
ptrdiff_t const GLvoid * data
Definition: opengl_enc.c:100
table_y1
static const uint8_t table_y1[]
Definition: ylc.c:155
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:219
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:273
YLCContext::table_bits_size
int table_bits_size
Definition: ylc.c:42
AVPacket::size
int size
Definition: packet.h:356
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:187
YLCContext
Definition: ylc.c:37
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:251
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:456
AVPacket::data
uint8_t * data
Definition: packet.h:355
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:40
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:283
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:267
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:38
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:41
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:64
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
VLC::bits
int bits
Definition: vlc.h:27
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:44
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:43
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:406
ff_ylc_decoder
AVCodec ff_ylc_decoder
Definition: ylc.c:472
AV_RL32
uint64_t_TMPL AV_WL64 unsigned int_TMPL AV_RL32
Definition: bytestream.h:87
build_vlc
static int build_vlc(AVCodecContext *avctx, VLC *vlc, const uint32_t *table)
Definition: ylc.c:87
val
static double val(void *priv, double ch)
Definition: aeval.c:76
AVPacket
This structure stores compressed data.
Definition: packet.h:332
ff_free_vlc
void ff_free_vlc(VLC *vlc)
Definition: bitstream.c:361
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:406
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