FFmpeg
ylc.c
Go to the documentation of this file.
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 <string.h>
22 
23 #define YLC_VLC_BITS 10
24 
25 #include "libavutil/intreadwrite.h"
26 #include "libavutil/mem.h"
27 #include "libavutil/pixfmt.h"
28 #include "avcodec.h"
29 #include "bswapdsp.h"
30 #include "codec_internal.h"
31 #include "get_bits.h"
32 #include "thread.h"
33 #include "unary.h"
34 
35 typedef struct YLCContext {
36  VLC vlc[4];
37  uint32_t table[256];
38  uint8_t *buffer;
39  int buffer_size;
40  BswapDSPContext bdsp;
41 } YLCContext;
42 
43 static av_cold int decode_init(AVCodecContext *avctx)
44 {
45  YLCContext *s = avctx->priv_data;
46 
47  avctx->pix_fmt = AV_PIX_FMT_YUYV422;
48  ff_bswapdsp_init(&s->bdsp);
49 
50  return 0;
51 }
52 
53 typedef struct Node {
54  int16_t sym;
55  uint32_t count;
56  int16_t l, r;
57 } Node;
58 
59 static void get_tree_codes(uint32_t *bits, int16_t *lens, uint8_t *xlat,
60  Node *nodes, int node,
61  uint32_t pfx, int pl, int *pos)
62 {
63  int s;
64 
65  s = nodes[node].sym;
66  if (s != -1) {
67  bits[*pos] = (~pfx) & ((1ULL << FFMAX(pl, 1)) - 1);
68  lens[*pos] = FFMAX(pl, 1);
69  xlat[*pos] = s + (pl == 0);
70  (*pos)++;
71  } else {
72  pfx <<= 1;
73  pl++;
74  get_tree_codes(bits, lens, xlat, nodes, nodes[node].l, pfx, pl,
75  pos);
76  pfx |= 1;
77  get_tree_codes(bits, lens, xlat, nodes, nodes[node].r, pfx, pl,
78  pos);
79  }
80 }
81 
82 static int build_vlc(AVCodecContext *avctx, VLC *vlc, const uint32_t *table)
83 {
84  Node nodes[512];
85  uint32_t bits[256];
86  int16_t lens[256];
87  uint8_t xlat[256];
88  int cur_node, i, j, pos = 0;
89 
90  ff_vlc_free(vlc);
91 
92  for (i = 0; i < 256; i++) {
93  nodes[i].count = table[i];
94  nodes[i].sym = i;
95  nodes[i].l = i;
96  nodes[i].r = i;
97  }
98 
99  cur_node = 256;
100  j = 0;
101  do {
102  for (i = 0; ; i++) {
103  int new_node = j;
104  int first_node = cur_node;
105  int second_node = cur_node;
106  unsigned nd, st;
107 
108  nodes[cur_node].count = -1;
109 
110  do {
111  int val = nodes[new_node].count;
112  if (val && (val < nodes[first_node].count)) {
113  if (val >= nodes[second_node].count) {
114  first_node = new_node;
115  } else {
116  first_node = second_node;
117  second_node = new_node;
118  }
119  }
120  new_node += 1;
121  } while (new_node != cur_node);
122 
123  if (first_node == cur_node)
124  break;
125 
126  nd = nodes[second_node].count;
127  st = nodes[first_node].count;
128  nodes[second_node].count = 0;
129  nodes[first_node].count = 0;
130  if (nd >= UINT32_MAX - st) {
131  av_log(avctx, AV_LOG_ERROR, "count overflow\n");
132  return AVERROR_INVALIDDATA;
133  }
134  nodes[cur_node].count = nd + st;
135  nodes[cur_node].sym = -1;
136  nodes[cur_node].l = first_node;
137  nodes[cur_node].r = second_node;
138  cur_node++;
139  }
140  j++;
141  } while (cur_node - 256 == j);
142 
143  get_tree_codes(bits, lens, xlat, nodes, cur_node - 1, 0, 0, &pos);
144 
145  return ff_vlc_init_sparse(vlc, YLC_VLC_BITS, pos, lens, 2, 2,
146  bits, 4, 4, xlat, 1, 1, 0);
147 }
148 
149 static const uint8_t table_y1[] = {
150  0xFE, 0xFE, 0xFE, 0xFE, 0xFE, 0xFE, 0xFE, 0xFE,
151  0xFE, 0xFE, 0xFE, 0xFE, 0xFE, 0xFE, 0xFE, 0xFE,
152  0xFE, 0xFE, 0xFE, 0xFE, 0xFE, 0xFE, 0xFE, 0xFE,
153  0xFE, 0xFE, 0xFE, 0xFE, 0xFE, 0xFE, 0xFE, 0xFE,
154  0xFE, 0xFE, 0xFE, 0xFE, 0xFE, 0xFE, 0xFE, 0xFE,
155  0xFE, 0xFE, 0xFE, 0xFE, 0xFE, 0xFF, 0xFF, 0xFF,
156  0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF,
157  0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF,
158  0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF,
159  0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF,
160  0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF,
161  0xFF, 0xFF, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
162  0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
163  0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
164  0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
165  0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
166  0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x01,
167  0x01, 0x01, 0x01, 0x01, 0x01, 0x01, 0x01, 0x01,
168  0x01, 0x01, 0x01, 0x01, 0x01, 0x01, 0x01, 0x01,
169  0x01, 0x01, 0x01, 0x01, 0x01, 0x01, 0x01, 0x01,
170  0x01, 0x01, 0x01, 0x01, 0x01, 0x01, 0x01, 0x01,
171  0x01, 0x01, 0x01, 0x01, 0x01, 0x01, 0x01, 0x01,
172  0x01, 0x01, 0x01, 0x01, 0x02, 0x02, 0x02, 0x02,
173  0x02, 0x02, 0x02, 0x02, 0x02, 0x02, 0x02, 0x02,
174  0x02, 0x02, 0x02, 0x02, 0x02, 0x02, 0x02, 0x02,
175  0x02, 0x02, 0x02, 0x02, 0x02, 0x02, 0x02, 0x02,
176  0x02, 0x02, 0x02, 0x02, 0x02, 0x02, 0x02, 0x02,
177  0x02, 0x02, 0x02, 0x02, 0x02, 0x02, 0x02, 0x02,
178  0x02, 0x00,
179 };
180 
181 static const uint8_t table_u[] = {
182  0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF,
183  0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0x00,
184  0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
185  0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x01, 0x01,
186  0x01, 0x01, 0x01, 0x01, 0x01, 0x01, 0x01, 0x01,
187  0x01, 0x01, 0x01, 0x01, 0x01, 0xFF, 0xFF, 0xFF,
188  0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF,
189  0xFF, 0xFF, 0xFF, 0xFF, 0x00, 0x00, 0x00, 0x00,
190  0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
191  0x00, 0x00, 0x00, 0x01, 0x01, 0x01, 0x01, 0x01,
192  0x01, 0x01, 0x01, 0x01, 0x01, 0x01, 0x01, 0x01,
193  0x01, 0x01, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF,
194  0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF,
195  0xFF, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
196  0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
197  0x01, 0x01, 0x01, 0x01, 0x01, 0x01, 0x01, 0x01,
198  0x01, 0x01, 0x01, 0x01, 0x01, 0x01, 0x01, 0xFF,
199  0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF,
200  0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0x00, 0x00,
201  0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
202  0x00, 0x00, 0x00, 0x00, 0x00, 0x01, 0x01, 0x01,
203  0x01, 0x01, 0x01, 0x01, 0x01, 0x01, 0x01, 0x01,
204  0x01, 0x01, 0x01, 0x01, 0xFF, 0xFF, 0xFF, 0xFF,
205  0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF,
206  0xFF, 0xFF, 0xFF, 0x00, 0x00, 0x00, 0x00, 0x00,
207  0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
208  0x00, 0x00, 0x01, 0x01, 0x01, 0x01, 0x01, 0x01,
209  0x01, 0x01, 0x01, 0x01, 0x01, 0x01, 0x01, 0x01,
210  0x01, 0x00,
211 };
212 
213 static const uint8_t table_y2[] = {
214  0xFC, 0xFC, 0xFC, 0xFD, 0xFD, 0xFD, 0xFE, 0xFE,
215  0xFE, 0xFF, 0xFF, 0xFF, 0x00, 0x00, 0x00, 0xFC,
216  0xFC, 0xFC, 0xFD, 0xFD, 0xFD, 0xFE, 0xFE, 0xFE,
217  0xFF, 0xFF, 0xFF, 0x00, 0x00, 0x00, 0xFC, 0xFC,
218  0xFC, 0xFD, 0xFD, 0xFD, 0xFE, 0xFE, 0xFE, 0xFF,
219  0xFF, 0xFF, 0x00, 0x00, 0x00, 0xFD, 0xFD, 0xFD,
220  0xFE, 0xFE, 0xFE, 0xFF, 0xFF, 0xFF, 0x00, 0x00,
221  0x00, 0x01, 0x01, 0x01, 0xFD, 0xFD, 0xFD, 0xFE,
222  0xFE, 0xFE, 0xFF, 0xFF, 0xFF, 0x00, 0x00, 0x00,
223  0x01, 0x01, 0x01, 0xFD, 0xFD, 0xFD, 0xFE, 0xFE,
224  0xFE, 0xFF, 0xFF, 0xFF, 0x00, 0x00, 0x00, 0x01,
225  0x01, 0x01, 0xFE, 0xFE, 0xFE, 0xFF, 0xFF, 0xFF,
226  0x00, 0x00, 0x00, 0x01, 0x01, 0x01, 0x02, 0x02,
227  0x02, 0xFE, 0xFE, 0xFE, 0xFF, 0xFF, 0xFF, 0x00,
228  0x00, 0x00, 0x01, 0x01, 0x01, 0x02, 0x02, 0x02,
229  0xFE, 0xFE, 0xFE, 0xFF, 0xFF, 0xFF, 0x00, 0x00,
230  0x00, 0x01, 0x01, 0x01, 0x02, 0x02, 0x02, 0xFF,
231  0xFF, 0xFF, 0x00, 0x00, 0x00, 0x01, 0x01, 0x01,
232  0x02, 0x02, 0x02, 0x03, 0x03, 0x03, 0xFF, 0xFF,
233  0xFF, 0x00, 0x00, 0x00, 0x01, 0x01, 0x01, 0x02,
234  0x02, 0x02, 0x03, 0x03, 0x03, 0xFF, 0xFF, 0xFF,
235  0x00, 0x00, 0x00, 0x01, 0x01, 0x01, 0x02, 0x02,
236  0x02, 0x03, 0x03, 0x03, 0x00, 0x00, 0x00, 0x01,
237  0x01, 0x01, 0x02, 0x02, 0x02, 0x03, 0x03, 0x03,
238  0x04, 0x04, 0x04, 0x00, 0x00, 0x00, 0x01, 0x01,
239  0x01, 0x02, 0x02, 0x02, 0x03, 0x03, 0x03, 0x04,
240  0x04, 0x04, 0x00, 0x00, 0x00, 0x01, 0x01, 0x01,
241  0x02, 0x02, 0x02, 0x03, 0x03, 0x03, 0x04, 0x04,
242  0x04, 0x00,
243 };
244 
245 static const uint8_t table_v[] = {
246  0xFF, 0x00, 0x01, 0xFF, 0x00, 0x01, 0xFF, 0x00,
247  0x01, 0xFF, 0x00, 0x01, 0xFF, 0x00, 0x01, 0xFF,
248  0x00, 0x01, 0xFF, 0x00, 0x01, 0xFF, 0x00, 0x01,
249  0xFF, 0x00, 0x01, 0xFF, 0x00, 0x01, 0xFF, 0x00,
250  0x01, 0xFF, 0x00, 0x01, 0xFF, 0x00, 0x01, 0xFF,
251  0x00, 0x01, 0xFF, 0x00, 0x01, 0xFF, 0x00, 0x01,
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, 0x00,
275 };
276 
277 static int decode_frame(AVCodecContext *avctx, AVFrame *p,
278  int *got_frame, AVPacket *avpkt)
279 {
280  int TL[4] = { 128, 128, 128, 128 };
281  int L[4] = { 128, 128, 128, 128 };
282  YLCContext *s = avctx->priv_data;
283  const uint8_t *buf = avpkt->data;
284  int ret, x, y, toffset, boffset;
285  GetBitContext gb;
286  uint8_t *dst;
287 
288  if (avpkt->size <= 16)
289  return AVERROR_INVALIDDATA;
290 
291  if (AV_RL32(buf) != MKTAG('Y', 'L', 'C', '0') ||
292  AV_RL32(buf + 4) != 0)
293  return AVERROR_INVALIDDATA;
294 
295  toffset = AV_RL32(buf + 8);
296  if (toffset < 16 || toffset >= avpkt->size)
297  return AVERROR_INVALIDDATA;
298 
299  boffset = AV_RL32(buf + 12);
300  if (toffset >= boffset || boffset >= avpkt->size)
301  return AVERROR_INVALIDDATA;
302 
303  if ((ret = ff_thread_get_buffer(avctx, p, 0)) < 0)
304  return ret;
305 
306  av_fast_malloc(&s->buffer, &s->buffer_size,
307  FFMAX(boffset - toffset, avpkt->size - boffset)
308  + AV_INPUT_BUFFER_PADDING_SIZE);
309  if (!s->buffer)
310  return AVERROR(ENOMEM);
311 
312  memcpy(s->buffer, avpkt->data + toffset, boffset - toffset);
313  memset(s->buffer + boffset - toffset, 0, AV_INPUT_BUFFER_PADDING_SIZE);
314  s->bdsp.bswap_buf((uint32_t *) s->buffer,
315  (uint32_t *) s->buffer,
316  (boffset - toffset + 3) >> 2);
317  if ((ret = init_get_bits8(&gb, s->buffer, boffset - toffset)) < 0)
318  return ret;
319 
320  for (int i = 0; i < 4; i++) {
321  for (x = 0; x < 256; x++) {
322  unsigned len = get_unary(&gb, 1, 31);
323  uint32_t val = ((1U << len) - 1) + get_bits_long(&gb, len);
324 
325  s->table[x] = val;
326  }
327 
328  ret = build_vlc(avctx, &s->vlc[i], s->table);
329  if (ret < 0)
330  return ret;
331  }
332 
333  memcpy(s->buffer, avpkt->data + boffset, avpkt->size - boffset);
334  memset(s->buffer + avpkt->size - boffset, 0, AV_INPUT_BUFFER_PADDING_SIZE);
335  s->bdsp.bswap_buf((uint32_t *) s->buffer,
336  (uint32_t *) s->buffer,
337  (avpkt->size - boffset) >> 2);
338  if ((ret = init_get_bits8(&gb, s->buffer, avpkt->size - boffset)) < 0)
339  return ret;
340 
341  dst = p->data[0];
342  for (y = 0; y < avctx->height; y++) {
343  memset(dst, 0, avctx->width * 2);
344  dst += p->linesize[0];
345  }
346 
347  dst = p->data[0];
348  for (y = 0; y < avctx->height; y++) {
349  for (x = 0; x < avctx->width * 2 && y < avctx->height;) {
350  if (get_bits_left(&gb) <= 0)
351  return AVERROR_INVALIDDATA;
352 
353  if (get_bits1(&gb)) {
354  int val = get_vlc2(&gb, s->vlc[0].table, YLC_VLC_BITS, 3);
355  if (val < 0) {
356  return AVERROR_INVALIDDATA;
357  } else if (val < 0xE1) {
358  dst[x ] = table_y1[val];
359  dst[x + 1] = table_u[val];
360  dst[x + 2] = table_y2[val];
361  dst[x + 3] = table_v[val];
362  x += 4;
363  } else {
364  int incr = (val - 0xDF) * 4;
365  if (x + incr >= avctx->width * 2) {
366  int iy = ((x + incr) / (avctx->width * 2));
367  x = (x + incr) % (avctx->width * 2);
368  y += iy;
369  dst += iy * p->linesize[0];
370  } else {
371  x += incr;
372  }
373  }
374  } else {
375  int y1, y2, u, v;
376 
377  y1 = get_vlc2(&gb, s->vlc[1].table, YLC_VLC_BITS, 3);
378  u = get_vlc2(&gb, s->vlc[2].table, YLC_VLC_BITS, 3);
379  y2 = get_vlc2(&gb, s->vlc[1].table, YLC_VLC_BITS, 3);
380  v = get_vlc2(&gb, s->vlc[3].table, YLC_VLC_BITS, 3);
381  if (y1 < 0 || y2 < 0 || u < 0 || v < 0)
382  return AVERROR_INVALIDDATA;
383  dst[x ] = y1;
384  dst[x + 1] = u;
385  dst[x + 2] = y1 + y2;
386  dst[x + 3] = v;
387  x += 4;
388  }
389  }
390  dst += p->linesize[0];
391  }
392 
393  dst = p->data[0];
394  for (x = 0; x < avctx->width * 2; x += 4) {
395  dst[x ] = dst[x ] + L[0];
396  dst[x + 2] = L[0] = dst[x + 2] + L[0];
397  L[1] = dst[x + 1] + L[1];
398  dst[x + 1] = L[1];
399  L[2] = dst[x + 3] + L[2];
400  dst[x + 3] = L[2];
401  }
402  dst += p->linesize[0];
403 
404  for (y = 1; y < avctx->height; y++) {
405  x = 0;
406  dst[x ] = dst[x ] + L[0] + dst[x + 0 - p->linesize[0]] - TL[0];
407  dst[x + 2] = L[0] = dst[x + 2] + L[0] + dst[x + 2 - p->linesize[0]] - TL[0];
408  TL[0] = dst[x + 2 - p->linesize[0]];
409  L[1] = dst[x + 1] + L[1] + dst[x + 1 - p->linesize[0]] - TL[1];
410  dst[x + 1] = L[1];
411  TL[1] = dst[x + 1 - p->linesize[0]];
412  L[2] = dst[x + 3] + L[2] + dst[x + 3 - p->linesize[0]] - TL[2];
413  dst[x + 3] = L[2];
414  TL[2] = dst[x + 3 - p->linesize[0]];
415  for (x = 4; x < avctx->width * 2; x += 4) {
416  dst[x ] = dst[x ] + L[0] + dst[x + 0 - p->linesize[0]] - TL[0];
417  dst[x + 2] = L[0] = dst[x + 2] + L[0] + dst[x + 2 - p->linesize[0]] - TL[0];
418  TL[0] = dst[x + 2 - p->linesize[0]];
419  L[1] = dst[x + 1] + L[1] + dst[x + 1 - p->linesize[0]] - TL[1];
420  dst[x + 1] = L[1];
421  TL[1] = dst[x + 1 - p->linesize[0]];
422  L[2] = dst[x + 3] + L[2] + dst[x + 3 - p->linesize[0]] - TL[2];
423  dst[x + 3] = L[2];
424  TL[2] = dst[x + 3 - p->linesize[0]];
425  }
426  dst += p->linesize[0];
427  }
428 
429  p->pict_type = AV_PICTURE_TYPE_I;
430  p->flags |= AV_FRAME_FLAG_KEY;
431  *got_frame = 1;
432 
433  return avpkt->size;
434 }
435 
436 static av_cold int decode_end(AVCodecContext *avctx)
437 {
438  YLCContext *s = avctx->priv_data;
439 
440  for (int i = 0; i < FF_ARRAY_ELEMS(s->vlc); i++)
441  ff_vlc_free(&s->vlc[i]);
442  av_freep(&s->buffer);
443  s->buffer_size = 0;
444 
445  return 0;
446 }
447 
448 const FFCodec ff_ylc_decoder = {
449  .p.name = "ylc",
450  CODEC_LONG_NAME("YUY2 Lossless Codec"),
451  .p.type = AVMEDIA_TYPE_VIDEO,
452  .p.id = AV_CODEC_ID_YLC,
453  .priv_data_size = sizeof(YLCContext),
454  .init = decode_init,
455  .close = decode_end,
456  FF_CODEC_DECODE_CB(decode_frame),
457  .p.capabilities = AV_CODEC_CAP_DR1 | AV_CODEC_CAP_FRAME_THREADS,
458 };
bswapdsp.h
get_bits_left
static int get_bits_left(GetBitContext *gb)
Definition: get_bits.h:695
r
const char * r
Definition: vf_curves.c:127
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:898
YLCContext::buffer_size
int buffer_size
Definition: ylc.c:39
u
#define u(width, name, range_min, range_max)
Definition: cbs_h2645.c:251
get_bits_long
static unsigned int get_bits_long(GetBitContext *s, int n)
Read 0-32 bits.
Definition: get_bits.h:421
table_v
static const uint8_t table_v[]
Definition: ylc.c:245
AVFrame
This structure describes decoded (raw) audio or video data.
Definition: frame.h:374
AVPacket::data
uint8_t * data
Definition: packet.h:524
table
static const uint16_t table[]
Definition: prosumer.c:205
FFCodec
Definition: codec_internal.h:126
YLCContext
Definition: ylc.c:35
AVFrame::flags
int flags
Frame flags, a combination of AV_FRAME_FLAGS.
Definition: frame.h:646
FFMAX
#define FFMAX(a, b)
Definition: macros.h:47
thread.h
AVFrame::data
uint8_t * data[AV_NUM_DATA_POINTERS]
pointer to the picture/channel planes.
Definition: frame.h:395
FFCodec::p
AVCodec p
The public AVCodec.
Definition: codec_internal.h:130
GetBitContext
Definition: get_bits.h:108
val
static double val(void *priv, double ch)
Definition: aeval.c:78
YLCContext::buffer
uint8_t * buffer
Definition: ylc.c:38
AV_LOG_ERROR
#define AV_LOG_ERROR
Something went wrong and cannot losslessly be recovered.
Definition: log.h:180
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:545
table_y1
static const uint8_t table_y1[]
Definition: ylc.c:149
AV_FRAME_FLAG_KEY
#define AV_FRAME_FLAG_KEY
A flag to mark frames that are keyframes.
Definition: frame.h:625
FF_CODEC_DECODE_CB
#define FF_CODEC_DECODE_CB(func)
Definition: codec_internal.h:286
intreadwrite.h
s
#define s(width, name)
Definition: cbs_vp9.c:198
ff_thread_get_buffer
int ff_thread_get_buffer(AVCodecContext *avctx, AVFrame *f, int flags)
Wrapper around get_buffer() for frame-multithreaded codecs.
Definition: pthread_frame.c:975
bits
uint8_t bits
Definition: vp3data.h:128
get_bits.h
decode_end
static av_cold int decode_end(AVCodecContext *avctx)
Definition: ylc.c:436
CODEC_LONG_NAME
#define CODEC_LONG_NAME(str)
Definition: codec_internal.h:271
YLCContext::table
uint32_t table[256]
Definition: ylc.c:37
AV_CODEC_CAP_FRAME_THREADS
#define AV_CODEC_CAP_FRAME_THREADS
Codec supports frame-level multithreading.
Definition: codec.h:110
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:74
AV_PICTURE_TYPE_I
@ AV_PICTURE_TYPE_I
Intra.
Definition: avutil.h:279
get_bits1
static unsigned int get_bits1(GetBitContext *s)
Definition: get_bits.h:388
Node::l
int16_t l
Definition: mvha.c:50
decode_frame
static int decode_frame(AVCodecContext *avctx, AVFrame *p, int *got_frame, AVPacket *avpkt)
Definition: ylc.c:277
get_vlc2
static av_always_inline int get_vlc2(GetBitContext *s, const VLCElem *table, int bits, int max_depth)
Parse a vlc code.
Definition: get_bits.h:652
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:59
AVFrame::pict_type
enum AVPictureType pict_type
Picture type of the frame.
Definition: frame.h:476
init
int(* init)(AVBSFContext *ctx)
Definition: dts2pts.c:366
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:525
codec_internal.h
AV_CODEC_ID_YLC
@ AV_CODEC_ID_YLC
Definition: codec_id.h:272
table_y2
static const uint8_t table_y2[]
Definition: ylc.c:213
ff_vlc_init_sparse
int ff_vlc_init_sparse(VLC *vlc, 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)
Build VLC decoding tables suitable for use with get_vlc2().
Definition: vlc.c:250
Node::r
int16_t r
Definition: mvha.c:50
table_u
static const uint8_t table_u[]
Definition: ylc.c:181
unary.h
i
#define i(width, name, range_min, range_max)
Definition: cbs_h2645.c:256
ff_ylc_decoder
const FFCodec ff_ylc_decoder
Definition: ylc.c:448
AVCodec::name
const char * name
Name of the codec implementation.
Definition: codec.h:194
len
int len
Definition: vorbis_enc_data.h:426
AVCodecContext::height
int height
Definition: avcodec.h:618
AVCodecContext::pix_fmt
enum AVPixelFormat pix_fmt
Pixel format, see AV_PIX_FMT_xxx.
Definition: avcodec.h:657
avcodec.h
ff_vlc_free
void ff_vlc_free(VLC *vlc)
Definition: vlc.c:580
ret
ret
Definition: filter_design.txt:187
pixfmt.h
pos
unsigned int pos
Definition: spdifenc.c:414
AV_INPUT_BUFFER_PADDING_SIZE
#define AV_INPUT_BUFFER_PADDING_SIZE
Definition: defs.h:40
AV_RL32
uint64_t_TMPL AV_WL64 unsigned int_TMPL AV_RL32
Definition: bytestream.h:92
U
#define U(x)
Definition: vpx_arith.h:37
AVCodecContext
main external API structure.
Definition: avcodec.h:445
VLC
Definition: vlc.h:36
L
#define L(x)
Definition: vpx_arith.h:36
AVMEDIA_TYPE_VIDEO
@ AVMEDIA_TYPE_VIDEO
Definition: avutil.h:201
Node::sym
int16_t sym
Definition: huffman.h:34
mem.h
AVPacket
This structure stores compressed data.
Definition: packet.h:501
AVCodecContext::priv_data
void * priv_data
Definition: avcodec.h:472
build_vlc
static int build_vlc(AVCodecContext *avctx, VLC *vlc, const uint32_t *table)
Definition: ylc.c:82
av_freep
#define av_freep(p)
Definition: tableprint_vlc.h:34
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:557
AVCodecContext::width
int width
picture width / height.
Definition: avcodec.h:618
YLCContext::vlc
VLC vlc[4]
Definition: ylc.c:36
YLC_VLC_BITS
#define YLC_VLC_BITS
Definition: ylc.c:23
AVFrame::linesize
int linesize[AV_NUM_DATA_POINTERS]
For video, a positive or negative value, which is typically indicating the size in bytes of each pict...
Definition: frame.h:419
av_log
#define av_log(a,...)
Definition: tableprint_vlc.h:27
AVERROR_INVALIDDATA
#define AVERROR_INVALIDDATA
Invalid data found when processing input.
Definition: error.h:61
MKTAG
#define MKTAG(a, b, c, d)
Definition: macros.h:55
Node::count
uint32_t count
Definition: huffman.h:36
BswapDSPContext
Definition: bswapdsp.h:24
YLCContext::bdsp
BswapDSPContext bdsp
Definition: ylc.c:40
decode_init
static av_cold int decode_init(AVCodecContext *avctx)
Definition: ylc.c:43
Generated on Wed Apr 24 2024 19:22:21 for FFmpeg by   doxygen 1.8.17