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[256];
42  uint8_t *buffer;
43  int buffer_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  uint32_t count;
60  int16_t l, r;
61 } Node;
62 
63 static void get_tree_codes(uint32_t *bits, int16_t *lens, uint8_t *xlat,
64  Node *nodes, int node,
65  uint32_t pfx, int pl, int *pos)
66 {
67  int s;
68 
69  s = nodes[node].sym;
70  if (s != -1) {
71  bits[*pos] = (~pfx) & ((1ULL << FFMAX(pl, 1)) - 1);
72  lens[*pos] = FFMAX(pl, 1);
73  xlat[*pos] = s + (pl == 0);
74  (*pos)++;
75  } else {
76  pfx <<= 1;
77  pl++;
78  get_tree_codes(bits, lens, xlat, nodes, nodes[node].l, pfx, pl,
79  pos);
80  pfx |= 1;
81  get_tree_codes(bits, lens, xlat, nodes, nodes[node].r, pfx, pl,
82  pos);
83  }
84 }
85 
86 static int build_vlc(AVCodecContext *avctx, VLC *vlc, const uint32_t *table)
87 {
88  Node nodes[512];
89  uint32_t bits[256];
90  int16_t lens[256];
91  uint8_t xlat[256];
92  int cur_node, i, j, pos = 0;
93 
94  ff_free_vlc(vlc);
95 
96  for (i = 0; i < 256; i++) {
97  nodes[i].count = table[i];
98  nodes[i].sym = i;
99  nodes[i].l = i;
100  nodes[i].r = i;
101  }
102 
103  cur_node = 256;
104  j = 0;
105  do {
106  for (i = 0; ; i++) {
107  int new_node = j;
108  int first_node = cur_node;
109  int second_node = cur_node;
110  unsigned nd, st;
111 
112  nodes[cur_node].count = -1;
113 
114  do {
115  int val = nodes[new_node].count;
116  if (val && (val < nodes[first_node].count)) {
117  if (val >= nodes[second_node].count) {
118  first_node = new_node;
119  } else {
120  first_node = second_node;
121  second_node = new_node;
122  }
123  }
124  new_node += 1;
125  } while (new_node != cur_node);
126 
127  if (first_node == cur_node)
128  break;
129 
130  nd = nodes[second_node].count;
131  st = nodes[first_node].count;
132  nodes[second_node].count = 0;
133  nodes[first_node].count = 0;
134  if (nd >= UINT32_MAX - st) {
135  av_log(avctx, AV_LOG_ERROR, "count overflow\n");
136  return AVERROR_INVALIDDATA;
137  }
138  nodes[cur_node].count = nd + st;
139  nodes[cur_node].sym = -1;
140  nodes[cur_node].l = first_node;
141  nodes[cur_node].r = second_node;
142  cur_node++;
143  }
144  j++;
145  } while (cur_node - 256 == j);
146 
147  get_tree_codes(bits, lens, xlat, nodes, cur_node - 1, 0, 0, &pos);
148 
149  return ff_init_vlc_sparse(vlc, YLC_VLC_BITS, pos, lens, 2, 2,
150  bits, 4, 4, xlat, 1, 1, 0);
151 }
152 
153 static const uint8_t table_y1[] = {
154  0xFE, 0xFE, 0xFE, 0xFE, 0xFE, 0xFE, 0xFE, 0xFE,
155  0xFE, 0xFE, 0xFE, 0xFE, 0xFE, 0xFE, 0xFE, 0xFE,
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, 0xFF, 0xFF, 0xFF,
160  0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF,
161  0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 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, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
166  0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
167  0x00, 0x00, 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, 0x01,
171  0x01, 0x01, 0x01, 0x01, 0x01, 0x01, 0x01, 0x01,
172  0x01, 0x01, 0x01, 0x01, 0x01, 0x01, 0x01, 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, 0x02, 0x02, 0x02, 0x02,
177  0x02, 0x02, 0x02, 0x02, 0x02, 0x02, 0x02, 0x02,
178  0x02, 0x02, 0x02, 0x02, 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, 0x00,
183 };
184 
185 static const uint8_t table_u[] = {
186  0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF,
187  0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0x00,
188  0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
189  0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x01, 0x01,
190  0x01, 0x01, 0x01, 0x01, 0x01, 0x01, 0x01, 0x01,
191  0x01, 0x01, 0x01, 0x01, 0x01, 0xFF, 0xFF, 0xFF,
192  0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF,
193  0xFF, 0xFF, 0xFF, 0xFF, 0x00, 0x00, 0x00, 0x00,
194  0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
195  0x00, 0x00, 0x00, 0x01, 0x01, 0x01, 0x01, 0x01,
196  0x01, 0x01, 0x01, 0x01, 0x01, 0x01, 0x01, 0x01,
197  0x01, 0x01, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF,
198  0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF,
199  0xFF, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
200  0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
201  0x01, 0x01, 0x01, 0x01, 0x01, 0x01, 0x01, 0x01,
202  0x01, 0x01, 0x01, 0x01, 0x01, 0x01, 0x01, 0xFF,
203  0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF,
204  0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0x00, 0x00,
205  0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
206  0x00, 0x00, 0x00, 0x00, 0x00, 0x01, 0x01, 0x01,
207  0x01, 0x01, 0x01, 0x01, 0x01, 0x01, 0x01, 0x01,
208  0x01, 0x01, 0x01, 0x01, 0xFF, 0xFF, 0xFF, 0xFF,
209  0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF,
210  0xFF, 0xFF, 0xFF, 0x00, 0x00, 0x00, 0x00, 0x00,
211  0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
212  0x00, 0x00, 0x01, 0x01, 0x01, 0x01, 0x01, 0x01,
213  0x01, 0x01, 0x01, 0x01, 0x01, 0x01, 0x01, 0x01,
214  0x01, 0x00,
215 };
216 
217 static const uint8_t table_y2[] = {
218  0xFC, 0xFC, 0xFC, 0xFD, 0xFD, 0xFD, 0xFE, 0xFE,
219  0xFE, 0xFF, 0xFF, 0xFF, 0x00, 0x00, 0x00, 0xFC,
220  0xFC, 0xFC, 0xFD, 0xFD, 0xFD, 0xFE, 0xFE, 0xFE,
221  0xFF, 0xFF, 0xFF, 0x00, 0x00, 0x00, 0xFC, 0xFC,
222  0xFC, 0xFD, 0xFD, 0xFD, 0xFE, 0xFE, 0xFE, 0xFF,
223  0xFF, 0xFF, 0x00, 0x00, 0x00, 0xFD, 0xFD, 0xFD,
224  0xFE, 0xFE, 0xFE, 0xFF, 0xFF, 0xFF, 0x00, 0x00,
225  0x00, 0x01, 0x01, 0x01, 0xFD, 0xFD, 0xFD, 0xFE,
226  0xFE, 0xFE, 0xFF, 0xFF, 0xFF, 0x00, 0x00, 0x00,
227  0x01, 0x01, 0x01, 0xFD, 0xFD, 0xFD, 0xFE, 0xFE,
228  0xFE, 0xFF, 0xFF, 0xFF, 0x00, 0x00, 0x00, 0x01,
229  0x01, 0x01, 0xFE, 0xFE, 0xFE, 0xFF, 0xFF, 0xFF,
230  0x00, 0x00, 0x00, 0x01, 0x01, 0x01, 0x02, 0x02,
231  0x02, 0xFE, 0xFE, 0xFE, 0xFF, 0xFF, 0xFF, 0x00,
232  0x00, 0x00, 0x01, 0x01, 0x01, 0x02, 0x02, 0x02,
233  0xFE, 0xFE, 0xFE, 0xFF, 0xFF, 0xFF, 0x00, 0x00,
234  0x00, 0x01, 0x01, 0x01, 0x02, 0x02, 0x02, 0xFF,
235  0xFF, 0xFF, 0x00, 0x00, 0x00, 0x01, 0x01, 0x01,
236  0x02, 0x02, 0x02, 0x03, 0x03, 0x03, 0xFF, 0xFF,
237  0xFF, 0x00, 0x00, 0x00, 0x01, 0x01, 0x01, 0x02,
238  0x02, 0x02, 0x03, 0x03, 0x03, 0xFF, 0xFF, 0xFF,
239  0x00, 0x00, 0x00, 0x01, 0x01, 0x01, 0x02, 0x02,
240  0x02, 0x03, 0x03, 0x03, 0x00, 0x00, 0x00, 0x01,
241  0x01, 0x01, 0x02, 0x02, 0x02, 0x03, 0x03, 0x03,
242  0x04, 0x04, 0x04, 0x00, 0x00, 0x00, 0x01, 0x01,
243  0x01, 0x02, 0x02, 0x02, 0x03, 0x03, 0x03, 0x04,
244  0x04, 0x04, 0x00, 0x00, 0x00, 0x01, 0x01, 0x01,
245  0x02, 0x02, 0x02, 0x03, 0x03, 0x03, 0x04, 0x04,
246  0x04, 0x00,
247 };
248 
249 static const uint8_t table_v[] = {
250  0xFF, 0x00, 0x01, 0xFF, 0x00, 0x01, 0xFF, 0x00,
251  0x01, 0xFF, 0x00, 0x01, 0xFF, 0x00, 0x01, 0xFF,
252  0x00, 0x01, 0xFF, 0x00, 0x01, 0xFF, 0x00, 0x01,
253  0xFF, 0x00, 0x01, 0xFF, 0x00, 0x01, 0xFF, 0x00,
254  0x01, 0xFF, 0x00, 0x01, 0xFF, 0x00, 0x01, 0xFF,
255  0x00, 0x01, 0xFF, 0x00, 0x01, 0xFF, 0x00, 0x01,
256  0xFF, 0x00, 0x01, 0xFF, 0x00, 0x01, 0xFF, 0x00,
257  0x01, 0xFF, 0x00, 0x01, 0xFF, 0x00, 0x01, 0xFF,
258  0x00, 0x01, 0xFF, 0x00, 0x01, 0xFF, 0x00, 0x01,
259  0xFF, 0x00, 0x01, 0xFF, 0x00, 0x01, 0xFF, 0x00,
260  0x01, 0xFF, 0x00, 0x01, 0xFF, 0x00, 0x01, 0xFF,
261  0x00, 0x01, 0xFF, 0x00, 0x01, 0xFF, 0x00, 0x01,
262  0xFF, 0x00, 0x01, 0xFF, 0x00, 0x01, 0xFF, 0x00,
263  0x01, 0xFF, 0x00, 0x01, 0xFF, 0x00, 0x01, 0xFF,
264  0x00, 0x01, 0xFF, 0x00, 0x01, 0xFF, 0x00, 0x01,
265  0xFF, 0x00, 0x01, 0xFF, 0x00, 0x01, 0xFF, 0x00,
266  0x01, 0xFF, 0x00, 0x01, 0xFF, 0x00, 0x01, 0xFF,
267  0x00, 0x01, 0xFF, 0x00, 0x01, 0xFF, 0x00, 0x01,
268  0xFF, 0x00, 0x01, 0xFF, 0x00, 0x01, 0xFF, 0x00,
269  0x01, 0xFF, 0x00, 0x01, 0xFF, 0x00, 0x01, 0xFF,
270  0x00, 0x01, 0xFF, 0x00, 0x01, 0xFF, 0x00, 0x01,
271  0xFF, 0x00, 0x01, 0xFF, 0x00, 0x01, 0xFF, 0x00,
272  0x01, 0xFF, 0x00, 0x01, 0xFF, 0x00, 0x01, 0xFF,
273  0x00, 0x01, 0xFF, 0x00, 0x01, 0xFF, 0x00, 0x01,
274  0xFF, 0x00, 0x01, 0xFF, 0x00, 0x01, 0xFF, 0x00,
275  0x01, 0xFF, 0x00, 0x01, 0xFF, 0x00, 0x01, 0xFF,
276  0x00, 0x01, 0xFF, 0x00, 0x01, 0xFF, 0x00, 0x01,
277  0xFF, 0x00, 0x01, 0xFF, 0x00, 0x01, 0xFF, 0x00,
278  0x01, 0x00,
279 };
280 
281 static int decode_frame(AVCodecContext *avctx,
282  void *data, int *got_frame,
283  AVPacket *avpkt)
284 {
285  int TL[4] = { 128, 128, 128, 128 };
286  int L[4] = { 128, 128, 128, 128 };
287  YLCContext *s = avctx->priv_data;
288  ThreadFrame frame = { .f = data };
289  const uint8_t *buf = avpkt->data;
290  int ret, x, y, toffset, boffset;
291  AVFrame * const p = data;
292  GetBitContext gb;
293  uint8_t *dst;
294 
295  if (avpkt->size <= 16)
296  return AVERROR_INVALIDDATA;
297 
298  if (AV_RL32(buf) != MKTAG('Y', 'L', 'C', '0') ||
299  AV_RL32(buf + 4) != 0)
300  return AVERROR_INVALIDDATA;
301 
302  toffset = AV_RL32(buf + 8);
303  if (toffset < 16 || toffset >= avpkt->size)
304  return AVERROR_INVALIDDATA;
305 
306  boffset = AV_RL32(buf + 12);
307  if (toffset >= boffset || boffset >= avpkt->size)
308  return AVERROR_INVALIDDATA;
309 
310  if ((ret = ff_thread_get_buffer(avctx, &frame, 0)) < 0)
311  return ret;
312 
313  av_fast_malloc(&s->buffer, &s->buffer_size,
314  FFMAX(boffset - toffset, avpkt->size - boffset)
315  + AV_INPUT_BUFFER_PADDING_SIZE);
316  if (!s->buffer)
317  return AVERROR(ENOMEM);
318 
319  memcpy(s->buffer, avpkt->data + toffset, boffset - toffset);
320  memset(s->buffer + boffset - toffset, 0, AV_INPUT_BUFFER_PADDING_SIZE);
321  s->bdsp.bswap_buf((uint32_t *) s->buffer,
322  (uint32_t *) s->buffer,
323  (boffset - toffset + 3) >> 2);
324  if ((ret = init_get_bits8(&gb, s->buffer, boffset - toffset)) < 0)
325  return ret;
326 
327  for (int i = 0; i < 4; i++) {
328  for (x = 0; x < 256; 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[i], s->table);
336  if (ret < 0)
337  return ret;
338  }
339 
340  memcpy(s->buffer, avpkt->data + boffset, avpkt->size - boffset);
341  memset(s->buffer + avpkt->size - boffset, 0, AV_INPUT_BUFFER_PADDING_SIZE);
342  s->bdsp.bswap_buf((uint32_t *) s->buffer,
343  (uint32_t *) s->buffer,
344  (avpkt->size - boffset) >> 2);
345  if ((ret = init_get_bits8(&gb, s->buffer, avpkt->size - boffset)) < 0)
346  return ret;
347 
348  dst = p->data[0];
349  for (y = 0; y < avctx->height; y++) {
350  memset(dst, 0, avctx->width * 2);
351  dst += p->linesize[0];
352  }
353 
354  dst = p->data[0];
355  for (y = 0; y < avctx->height; y++) {
356  for (x = 0; x < avctx->width * 2 && y < avctx->height;) {
357  if (get_bits_left(&gb) <= 0)
358  return AVERROR_INVALIDDATA;
359 
360  if (get_bits1(&gb)) {
361  int val = get_vlc2(&gb, s->vlc[0].table, YLC_VLC_BITS, 3);
362  if (val < 0) {
363  return AVERROR_INVALIDDATA;
364  } else if (val < 0xE1) {
365  dst[x ] = table_y1[val];
366  dst[x + 1] = table_u[val];
367  dst[x + 2] = table_y2[val];
368  dst[x + 3] = table_v[val];
369  x += 4;
370  } else {
371  int incr = (val - 0xDF) * 4;
372  if (x + incr >= avctx->width * 2) {
373  int iy = ((x + incr) / (avctx->width * 2));
374  x = (x + incr) % (avctx->width * 2);
375  y += iy;
376  dst += iy * p->linesize[0];
377  } else {
378  x += incr;
379  }
380  }
381  } else {
382  int y1, y2, u, v;
383 
384  y1 = get_vlc2(&gb, s->vlc[1].table, YLC_VLC_BITS, 3);
385  u = get_vlc2(&gb, s->vlc[2].table, YLC_VLC_BITS, 3);
386  y2 = get_vlc2(&gb, s->vlc[1].table, YLC_VLC_BITS, 3);
387  v = get_vlc2(&gb, s->vlc[3].table, YLC_VLC_BITS, 3);
388  if (y1 < 0 || y2 < 0 || u < 0 || v < 0)
389  return AVERROR_INVALIDDATA;
390  dst[x ] = y1;
391  dst[x + 1] = u;
392  dst[x + 2] = y1 + y2;
393  dst[x + 3] = v;
394  x += 4;
395  }
396  }
397  dst += p->linesize[0];
398  }
399 
400  dst = p->data[0];
401  for (x = 0; x < avctx->width * 2; x += 4) {
402  dst[x ] = dst[x ] + L[0];
403  dst[x + 2] = L[0] = dst[x + 2] + L[0];
404  L[1] = dst[x + 1] + L[1];
405  dst[x + 1] = L[1];
406  L[2] = dst[x + 3] + L[2];
407  dst[x + 3] = L[2];
408  }
409  dst += p->linesize[0];
410 
411  for (y = 1; y < avctx->height; y++) {
412  x = 0;
413  dst[x ] = dst[x ] + L[0] + dst[x + 0 - p->linesize[0]] - TL[0];
414  dst[x + 2] = L[0] = dst[x + 2] + L[0] + dst[x + 2 - p->linesize[0]] - TL[0];
415  TL[0] = dst[x + 2 - p->linesize[0]];
416  L[1] = dst[x + 1] + L[1] + dst[x + 1 - p->linesize[0]] - TL[1];
417  dst[x + 1] = L[1];
418  TL[1] = dst[x + 1 - p->linesize[0]];
419  L[2] = dst[x + 3] + L[2] + dst[x + 3 - p->linesize[0]] - TL[2];
420  dst[x + 3] = L[2];
421  TL[2] = dst[x + 3 - p->linesize[0]];
422  for (x = 4; x < avctx->width * 2; x += 4) {
423  dst[x ] = dst[x ] + L[0] + dst[x + 0 - p->linesize[0]] - TL[0];
424  dst[x + 2] = L[0] = dst[x + 2] + L[0] + dst[x + 2 - p->linesize[0]] - TL[0];
425  TL[0] = dst[x + 2 - p->linesize[0]];
426  L[1] = dst[x + 1] + L[1] + dst[x + 1 - p->linesize[0]] - TL[1];
427  dst[x + 1] = L[1];
428  TL[1] = dst[x + 1 - p->linesize[0]];
429  L[2] = dst[x + 3] + L[2] + dst[x + 3 - p->linesize[0]] - TL[2];
430  dst[x + 3] = L[2];
431  TL[2] = dst[x + 3 - p->linesize[0]];
432  }
433  dst += p->linesize[0];
434  }
435 
436  p->pict_type = AV_PICTURE_TYPE_I;
437  p->key_frame = 1;
438  *got_frame = 1;
439 
440  return avpkt->size;
441 }
442 
443 static av_cold int decode_end(AVCodecContext *avctx)
444 {
445  YLCContext *s = avctx->priv_data;
446 
447  for (int i = 0; i < FF_ARRAY_ELEMS(s->vlc); i++)
448  ff_free_vlc(&s->vlc[i]);
449  av_freep(&s->buffer);
450  s->buffer_size = 0;
451 
452  return 0;
453 }
454 
455 const AVCodec ff_ylc_decoder = {
456  .name = "ylc",
457  .long_name = NULL_IF_CONFIG_SMALL("YUY2 Lossless Codec"),
458  .type = AVMEDIA_TYPE_VIDEO,
459  .id = AV_CODEC_ID_YLC,
460  .priv_data_size = sizeof(YLCContext),
461  .init = decode_init,
462  .close = decode_end,
463  .decode = decode_frame,
464  .capabilities = AV_CODEC_CAP_DR1 | AV_CODEC_CAP_FRAME_THREADS,
465  .caps_internal = FF_CODEC_CAP_INIT_THREADSAFE,
466 };
AVCodec
AVCodec.
Definition: codec.h:197
bswapdsp.h
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:41
init
static av_cold int init(AVCodecContext *avctx)
Definition: avrndec.c:31
get_bits_left
static int get_bits_left(GetBitContext *gb)
Definition: get_bits.h:849
r
const char * r
Definition: vf_curves.c:116
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
Node
Definition: agm.c:915
YLCContext::buffer_size
int buffer_size
Definition: ylc.c:43
u
#define u(width, name, range_min, range_max)
Definition: cbs_h2645.c:264
MKTAG
#define MKTAG(a, b, c, d)
Definition: common.h:478
get_bits_long
static unsigned int get_bits_long(GetBitContext *s, int n)
Read 0-32 bits.
Definition: get_bits.h:546
table_v
static const uint8_t table_v[]
Definition: ylc.c:249
AVFrame
This structure describes decoded (raw) audio or video data.
Definition: frame.h:303
internal.h
AVPacket::data
uint8_t * data
Definition: packet.h:365
huffyuvdsp.h
table
static const uint16_t table[]
Definition: prosumer.c:206
data
const char data[16]
Definition: mxf.c:142
YLCContext
Definition: ylc.c:39
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
thread.h
AVFrame::data
uint8_t * data[AV_NUM_DATA_POINTERS]
pointer to the picture/channel planes.
Definition: frame.h:317
decode_frame
static int decode_frame(AVCodecContext *avctx, void *data, int *got_frame, AVPacket *avpkt)
Definition: ylc.c:281
U
#define U(x)
Definition: vp56_arith.h:37
GetBitContext
Definition: get_bits.h:61
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
AVFrame::key_frame
int key_frame
1 -> keyframe, 0-> not
Definition: frame.h:381
val
static double val(void *priv, double ch)
Definition: aeval.c:76
YLCContext::buffer
uint8_t * buffer
Definition: ylc.c:42
AV_LOG_ERROR
#define AV_LOG_ERROR
Something went wrong and cannot losslessly be recovered.
Definition: log.h:181
FF_ARRAY_ELEMS
#define FF_ARRAY_ELEMS(a)
Definition: sinewin_tablegen.c:29
av_cold
#define av_cold
Definition: attributes.h:90
init_get_bits8
static int init_get_bits8(GetBitContext *s, const uint8_t *buffer, int byte_size)
Initialize GetBitContext.
Definition: get_bits.h:677
table_y1
static const uint8_t table_y1[]
Definition: ylc.c:153
decode
static void decode(AVCodecContext *dec_ctx, AVPacket *pkt, AVFrame *frame, FILE *outfile)
Definition: decode_audio.c:71
intreadwrite.h
s
#define s(width, name)
Definition: cbs_vp9.c:257
bits
uint8_t bits
Definition: vp3data.h:141
get_bits.h
ff_free_vlc
void ff_free_vlc(VLC *vlc)
Definition: bitstream.c:420
decode_end
static av_cold int decode_end(AVCodecContext *avctx)
Definition: ylc.c:443
YLCContext::table
uint32_t table[256]
Definition: ylc.c:41
AV_CODEC_CAP_FRAME_THREADS
#define AV_CODEC_CAP_FRAME_THREADS
Codec supports frame-level multithreading.
Definition: codec.h:108
ff_bswapdsp_init
av_cold void ff_bswapdsp_init(BswapDSPContext *c)
Definition: bswapdsp.c:49
AV_PIX_FMT_YUYV422
@ AV_PIX_FMT_YUYV422
packed YUV 4:2:2, 16bpp, Y0 Cb Y1 Cr
Definition: pixfmt.h:67
AV_PICTURE_TYPE_I
@ AV_PICTURE_TYPE_I
Intra.
Definition: avutil.h:274
get_bits1
static unsigned int get_bits1(GetBitContext *s)
Definition: get_bits.h:498
Node::l
int16_t l
Definition: mvha.c:53
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:312
get_unary
static int get_unary(GetBitContext *gb, int stop, int len)
Get unary code of limited length.
Definition: unary.h:46
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:63
AVFrame::pict_type
enum AVPictureType pict_type
Picture type of the frame.
Definition: frame.h:386
AV_CODEC_CAP_DR1
#define AV_CODEC_CAP_DR1
Codec uses get_buffer() or get_encode_buffer() for allocating buffers and supports custom allocators.
Definition: codec.h:52
AVPacket::size
int size
Definition: packet.h:366
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:117
AV_CODEC_ID_YLC
@ AV_CODEC_ID_YLC
Definition: codec_id.h:270
FFMAX
#define FFMAX(a, b)
Definition: common.h:103
table_y2
static const uint8_t table_y2[]
Definition: ylc.c:217
Node::r
int16_t r
Definition: mvha.c:53
table_u
static const uint8_t table_u[]
Definition: ylc.c:185
unary.h
i
int i
Definition: input.c:407
internal.h
ff_ylc_decoder
const AVCodec ff_ylc_decoder
Definition: ylc.c:455
AVCodec::name
const char * name
Name of the codec implementation.
Definition: codec.h:204
len
int len
Definition: vorbis_enc_data.h:452
AVCodecContext::height
int height
Definition: avcodec.h:674
AVCodecContext::pix_fmt
enum AVPixelFormat pix_fmt
Pixel format, see AV_PIX_FMT_xxx.
Definition: avcodec.h:711
avcodec.h
ret
ret
Definition: filter_design.txt:187
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:264
pos
unsigned int pos
Definition: spdifenc.c:412
AV_INPUT_BUFFER_PADDING_SIZE
#define AV_INPUT_BUFFER_PADDING_SIZE
Definition: avcodec.h:192
AV_RL32
uint64_t_TMPL AV_WL64 unsigned int_TMPL AV_RL32
Definition: bytestream.h:92
L
#define L(x)
Definition: vp56_arith.h:36
AVCodecContext
main external API structure.
Definition: avcodec.h:501
ThreadFrame
Definition: thread.h:34
VLC
Definition: vlc.h:26
AVMEDIA_TYPE_VIDEO
@ AVMEDIA_TYPE_VIDEO
Definition: avutil.h:201
Node::sym
int16_t sym
Definition: huffman.h:33
mem.h
AVPacket
This structure stores compressed data.
Definition: packet.h:342
AVCodecContext::priv_data
void * priv_data
Definition: avcodec.h:528
build_vlc
static int build_vlc(AVCodecContext *avctx, VLC *vlc, const uint32_t *table)
Definition: ylc.c:86
av_freep
#define av_freep(p)
Definition: tableprint_vlc.h:35
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:508
AVCodecContext::width
int width
picture width / height.
Definition: avcodec.h:674
YLCContext::vlc
VLC vlc[4]
Definition: ylc.c:40
imgutils.h
YLC_VLC_BITS
#define YLC_VLC_BITS
Definition: ylc.c:25
AVFrame::linesize
int linesize[AV_NUM_DATA_POINTERS]
For video, size in bytes of each picture line.
Definition: frame.h:334
av_log
#define av_log(a,...)
Definition: tableprint_vlc.h:28
AVERROR_INVALIDDATA
#define AVERROR_INVALIDDATA
Invalid data found when processing input.
Definition: error.h:59
Node::count
uint32_t count
Definition: huffman.h:35
BswapDSPContext
Definition: bswapdsp.h:24
YLCContext::bdsp
BswapDSPContext bdsp
Definition: ylc.c:44
decode_init
static av_cold int decode_init(AVCodecContext *avctx)
Definition: ylc.c:47
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