FFmpeg
notchlc.c
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1 /*
2  * NotchLC decoder
3  * Copyright (c) 2020 Paul B Mahol
4  *
5  * This file is part of FFmpeg.
6  *
7  * FFmpeg is free software; you can redistribute it and/or
8  * modify it under the terms of the GNU Lesser General Public
9  * License as published by the Free Software Foundation; either
10  * version 2.1 of the License, or (at your option) any later version.
11  *
12  * FFmpeg is distributed in the hope that it will be useful,
13  * but WITHOUT ANY WARRANTY; without even the implied warranty of
14  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
15  * Lesser General Public License for more details.
16  *
17  * You should have received a copy of the GNU Lesser General Public
18  * License along with FFmpeg; if not, write to the Free Software
19  * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
20  */
21 
22 #include <stdio.h>
23 #include <string.h>
24 
25 #define BITSTREAM_READER_LE
26 #include "libavutil/mem.h"
27 #include "avcodec.h"
28 #include "bytestream.h"
29 #include "codec_internal.h"
30 #include "decode.h"
31 #include "get_bits.h"
32 #include "lzf.h"
33 #include "thread.h"
34 
35 typedef struct NotchLCContext {
36  unsigned compressed_size;
37  unsigned format;
38 
41 
42  uint8_t *lzf_buffer;
44 
45  unsigned texture_size_x;
46  unsigned texture_size_y;
51  unsigned y_data_offset;
52  unsigned uv_data_offset;
53  unsigned y_data_size;
54  unsigned a_data_offset;
55  unsigned uv_count_offset;
56  unsigned a_count_size;
57  unsigned data_end;
58 
62 
64 {
67  avctx->colorspace = AVCOL_SPC_RGB;
70 
71  return 0;
72 }
73 
74 #define HISTORY_SIZE (64 * 1024)
75 
76 static int lz4_decompress(AVCodecContext *avctx,
77  GetByteContext *gb,
78  PutByteContext *pb)
79 {
80  unsigned reference_pos, delta, pos = 0;
81  uint8_t history[64 * 1024];
82  int match_length;
83 
84  while (bytestream2_get_bytes_left(gb) > 0) {
85  uint8_t token = bytestream2_get_byte(gb);
86  int num_literals = token >> 4;
87 
88  if (num_literals == 15) {
89  unsigned char current;
90  do {
91  current = bytestream2_get_byte(gb);
92  num_literals += current;
93  } while (current == 255);
94  }
95 
96  if (bytestream2_get_bytes_left(gb) < num_literals)
97  return AVERROR_INVALIDDATA;
98 
99  if (pos + num_literals < HISTORY_SIZE) {
100  bytestream2_get_buffer(gb, history + pos, num_literals);
101  pos += num_literals;
102  } else {
103  while (num_literals-- > 0) {
104  history[pos++] = bytestream2_get_byte(gb);
105  if (pos == HISTORY_SIZE) {
106  bytestream2_put_buffer(pb, history, HISTORY_SIZE);
107  pos = 0;
108  }
109  }
110  }
111 
112  if (bytestream2_get_bytes_left(gb) <= 0)
113  break;
114 
115  delta = bytestream2_get_le16(gb);
116  if (delta == 0)
117  return 0;
118  match_length = 4 + (token & 0x0F);
119  if (match_length == 4 + 0x0F) {
120  uint8_t current;
121 
122  do {
123  current = bytestream2_get_byte(gb);
124  match_length += current;
125  } while (current == 255);
126  }
127  reference_pos = (pos >= delta) ? (pos - delta) : (HISTORY_SIZE + pos - delta);
128  if (pos + match_length < HISTORY_SIZE && reference_pos + match_length < HISTORY_SIZE) {
129  if (pos >= reference_pos + match_length || reference_pos >= pos + match_length) {
130  memcpy(history + pos, history + reference_pos, match_length);
131  pos += match_length;
132  } else {
133  while (match_length-- > 0)
134  history[pos++] = history[reference_pos++];
135  }
136  } else {
137  while (match_length-- > 0) {
138  history[pos++] = history[reference_pos++];
139  if (pos == HISTORY_SIZE) {
140  bytestream2_put_buffer(pb, history, HISTORY_SIZE);
141  pos = 0;
142  }
143  reference_pos %= HISTORY_SIZE;
144  }
145  }
146  }
147 
148  bytestream2_put_buffer(pb, history, pos);
149 
150  return bytestream2_tell_p(pb);
151 }
152 
153 static int decode_blocks(AVCodecContext *avctx, AVFrame *p,
154  unsigned uncompressed_size)
155 {
156  NotchLCContext *s = avctx->priv_data;
157  GetByteContext rgb, dgb, *gb = &s->gb;
159  int ylinesize, ulinesize, vlinesize, alinesize;
160  uint16_t *dsty, *dstu, *dstv, *dsta;
161  int ret;
162 
163  s->texture_size_x = bytestream2_get_le32(gb);
164  s->texture_size_y = bytestream2_get_le32(gb);
165 
166  ret = ff_set_dimensions(avctx, s->texture_size_x, s->texture_size_y);
167  if (ret < 0)
168  return ret;
169 
170  s->uv_offset_data_offset = bytestream2_get_le32(gb);
171  if (s->uv_offset_data_offset >= UINT_MAX / 4)
172  return AVERROR_INVALIDDATA;
173  s->uv_offset_data_offset *= 4;
174  if (s->uv_offset_data_offset >= uncompressed_size)
175  return AVERROR_INVALIDDATA;
176 
177  s->y_control_data_offset = bytestream2_get_le32(gb);
178  if (s->y_control_data_offset >= UINT_MAX / 4)
179  return AVERROR_INVALIDDATA;
180  s->y_control_data_offset *= 4;
181  if (s->y_control_data_offset >= uncompressed_size)
182  return AVERROR_INVALIDDATA;
183 
184  s->a_control_word_offset = bytestream2_get_le32(gb);
185  if (s->a_control_word_offset >= UINT_MAX / 4)
186  return AVERROR_INVALIDDATA;
187  s->a_control_word_offset *= 4;
188  if (s->a_control_word_offset >= uncompressed_size)
189  return AVERROR_INVALIDDATA;
190 
191  s->uv_data_offset = bytestream2_get_le32(gb);
192  if (s->uv_data_offset >= UINT_MAX / 4)
193  return AVERROR_INVALIDDATA;
194  s->uv_data_offset *= 4;
195  if (s->uv_data_offset >= uncompressed_size)
196  return AVERROR_INVALIDDATA;
197 
198  s->y_data_size = bytestream2_get_le32(gb);
199  if (s->y_data_size >= UINT_MAX / 4)
200  return AVERROR_INVALIDDATA;
201 
202  s->a_data_offset = bytestream2_get_le32(gb);
203  if (s->a_data_offset >= UINT_MAX / 4)
204  return AVERROR_INVALIDDATA;
205  s->a_data_offset *= 4;
206  if (s->a_data_offset >= uncompressed_size)
207  return AVERROR_INVALIDDATA;
208 
209  s->a_count_size = bytestream2_get_le32(gb);
210  if (s->a_count_size >= UINT_MAX / 4)
211  return AVERROR_INVALIDDATA;
212  s->a_count_size *= 4;
213  if (s->a_count_size >= uncompressed_size)
214  return AVERROR_INVALIDDATA;
215 
216  s->data_end = bytestream2_get_le32(gb);
217  if (s->data_end > uncompressed_size)
218  return AVERROR_INVALIDDATA;
219 
220  s->y_data_row_offsets = bytestream2_tell(gb);
221  if (s->data_end <= s->y_data_size)
222  return AVERROR_INVALIDDATA;
223  s->y_data_offset = s->data_end - s->y_data_size;
224  if (s->y_data_offset <= s->a_data_offset)
225  return AVERROR_INVALIDDATA;
226  s->uv_count_offset = s->y_data_offset - s->a_data_offset;
227 
228  if ((ret = ff_thread_get_buffer(avctx, p, 0)) < 0)
229  return ret;
230 
231  rgb = *gb;
232  dgb = *gb;
233  bytestream2_seek(&rgb, s->y_data_row_offsets, SEEK_SET);
234  bytestream2_seek(gb, s->y_control_data_offset, SEEK_SET);
235 
236  if (bytestream2_get_bytes_left(gb) < (avctx->height + 3) / 4 * ((avctx->width + 3) / 4) * 4)
237  return AVERROR_INVALIDDATA;
238 
239  dsty = (uint16_t *)p->data[0];
240  dsta = (uint16_t *)p->data[3];
241  ylinesize = p->linesize[0] / 2;
242  alinesize = p->linesize[3] / 2;
243 
244  for (int y = 0; y < avctx->height; y += 4) {
245  const unsigned row_offset = bytestream2_get_le32(&rgb);
246 
247  bytestream2_seek(&dgb, s->y_data_offset + row_offset, SEEK_SET);
248 
250  if (ret < 0)
251  return ret;
252  for (int x = 0; x < avctx->width; x += 4) {
253  unsigned item = bytestream2_get_le32(gb);
254  unsigned y_min = item & 4095;
255  unsigned y_max = (item >> 12) & 4095;
256  unsigned y_diff = y_max - y_min;
257  unsigned control[4];
258 
259  control[0] = (item >> 24) & 3;
260  control[1] = (item >> 26) & 3;
261  control[2] = (item >> 28) & 3;
262  control[3] = (item >> 30) & 3;
263 
264  for (int i = 0; i < 4; i++) {
265  const int nb_bits = control[i] + 1;
266  const int div = (1 << nb_bits) - 1;
267  const int add = div - 1;
268 
269  dsty[x + i * ylinesize + 0] = av_clip_uintp2(y_min + ((y_diff * get_bits(&bit, nb_bits) + add) / div), 12);
270  dsty[x + i * ylinesize + 1] = av_clip_uintp2(y_min + ((y_diff * get_bits(&bit, nb_bits) + add) / div), 12);
271  dsty[x + i * ylinesize + 2] = av_clip_uintp2(y_min + ((y_diff * get_bits(&bit, nb_bits) + add) / div), 12);
272  dsty[x + i * ylinesize + 3] = av_clip_uintp2(y_min + ((y_diff * get_bits(&bit, nb_bits) + add) / div), 12);
273  }
274  }
275 
276  dsty += 4 * ylinesize;
277  }
278 
279  rgb = *gb;
280  dgb = *gb;
281  bytestream2_seek(gb, s->a_control_word_offset, SEEK_SET);
282  if (s->uv_count_offset == s->a_control_word_offset) {
283  for (int y = 0; y < avctx->height; y++) {
284  for (int x = 0; x < avctx->width; x++)
285  dsta[x] = 4095;
286  dsta += alinesize;
287  }
288  } else {
289  if (bytestream2_get_bytes_left(gb) < (avctx->height + 15) / 16 * ((avctx->width + 15) / 16) * 8)
290  return AVERROR_INVALIDDATA;
291 
292  for (int y = 0; y < avctx->height; y += 16) {
293  for (int x = 0; x < avctx->width; x += 16) {
294  unsigned m = bytestream2_get_le32(gb);
295  unsigned offset = bytestream2_get_le32(gb);
296  unsigned alpha0, alpha1;
297  uint64_t control;
298 
299  if (offset >= UINT_MAX / 4)
300  return AVERROR_INVALIDDATA;
301  offset = offset * 4 + s->uv_data_offset + s->a_data_offset;
302  if (offset >= s->data_end)
303  return AVERROR_INVALIDDATA;
304 
305  bytestream2_seek(&dgb, offset, SEEK_SET);
306  control = bytestream2_get_le64(&dgb);
307  alpha0 = control & 0xFF;
308  alpha1 = (control >> 8) & 0xFF;
309  control = control >> 16;
310 
311  for (int by = 0; by < 4; by++) {
312  for (int bx = 0; bx < 4; bx++) {
313  switch (m & 3) {
314  case 0:
315  for (int i = 0; i < 4; i++) {
316  for (int j = 0; j < 4; j++) {
317  dsta[x + (i + by * 4) * alinesize + bx * 4 + j] = 0;
318  }
319  }
320  break;
321  case 1:
322  for (int i = 0; i < 4; i++) {
323  for (int j = 0; j < 4; j++) {
324  dsta[x + (i + by * 4) * alinesize + bx * 4 + j] = 4095;
325  }
326  }
327  break;
328  case 2:
329  for (int i = 0; i < 4; i++) {
330  for (int j = 0; j < 4; j++) {
331  dsta[x + (i + by * 4) * alinesize + bx * 4 + j] = (alpha0 + (alpha1 - alpha0) * (control & 7)) << 4;
332  }
333  }
334  break;
335  default:
336  return AVERROR_INVALIDDATA;
337  }
338 
339  control >>= 3;
340  m >>= 2;
341  }
342  }
343  }
344 
345  dsta += 16 * alinesize;
346  }
347  }
348 
349  bytestream2_seek(&rgb, s->uv_offset_data_offset, SEEK_SET);
350 
351  dstu = (uint16_t *)p->data[1];
352  dstv = (uint16_t *)p->data[2];
353  ulinesize = p->linesize[1] / 2;
354  vlinesize = p->linesize[2] / 2;
355 
356  for (int y = 0; y < avctx->height; y += 16) {
357  for (int x = 0; x < avctx->width; x += 16) {
358  unsigned offset = bytestream2_get_le32(&rgb) * 4;
359  int u[16][16] = { 0 }, v[16][16] = { 0 };
360  int u0, v0, u1, v1, udif, vdif;
361  unsigned escape, is8x8, loc;
362 
363  bytestream2_seek(&dgb, s->uv_data_offset + offset, SEEK_SET);
364 
365  is8x8 = bytestream2_get_le16(&dgb);
366  escape = bytestream2_get_le16(&dgb);
367 
368  if (escape == 0 && is8x8 == 0) {
369  u0 = bytestream2_get_byte(&dgb);
370  v0 = bytestream2_get_byte(&dgb);
371  u1 = bytestream2_get_byte(&dgb);
372  v1 = bytestream2_get_byte(&dgb);
373  loc = bytestream2_get_le32(&dgb);
374  u0 = (u0 << 4) | (u0 & 0xF);
375  v0 = (v0 << 4) | (v0 & 0xF);
376  u1 = (u1 << 4) | (u1 & 0xF);
377  v1 = (v1 << 4) | (v1 & 0xF);
378  udif = u1 - u0;
379  vdif = v1 - v0;
380 
381  for (int i = 0; i < 16; i += 4) {
382  for (int j = 0; j < 16; j += 4) {
383  for (int ii = 0; ii < 4; ii++) {
384  for (int jj = 0; jj < 4; jj++) {
385  u[i + ii][j + jj] = u0 + ((udif * (int)(loc & 3) + 2) / 3);
386  v[i + ii][j + jj] = v0 + ((vdif * (int)(loc & 3) + 2) / 3);
387  }
388  }
389 
390  loc >>= 2;
391  }
392  }
393  } else {
394  for (int i = 0; i < 16; i += 8) {
395  for (int j = 0; j < 16; j += 8) {
396  if (is8x8 & 1) {
397  u0 = bytestream2_get_byte(&dgb);
398  v0 = bytestream2_get_byte(&dgb);
399  u1 = bytestream2_get_byte(&dgb);
400  v1 = bytestream2_get_byte(&dgb);
401  loc = bytestream2_get_le32(&dgb);
402  u0 = (u0 << 4) | (u0 & 0xF);
403  v0 = (v0 << 4) | (v0 & 0xF);
404  u1 = (u1 << 4) | (u1 & 0xF);
405  v1 = (v1 << 4) | (v1 & 0xF);
406  udif = u1 - u0;
407  vdif = v1 - v0;
408 
409  for (int ii = 0; ii < 8; ii += 2) {
410  for (int jj = 0; jj < 8; jj += 2) {
411  for (int iii = 0; iii < 2; iii++) {
412  for (int jjj = 0; jjj < 2; jjj++) {
413  u[i + ii + iii][j + jj + jjj] = u0 + ((udif * (int)(loc & 3) + 2) / 3);
414  v[i + ii + iii][j + jj + jjj] = v0 + ((vdif * (int)(loc & 3) + 2) / 3);
415  }
416  }
417 
418  loc >>= 2;
419  }
420  }
421  } else if (escape) {
422  for (int ii = 0; ii < 8; ii += 4) {
423  for (int jj = 0; jj < 8; jj += 4) {
424  u0 = bytestream2_get_byte(&dgb);
425  v0 = bytestream2_get_byte(&dgb);
426  u1 = bytestream2_get_byte(&dgb);
427  v1 = bytestream2_get_byte(&dgb);
428  loc = bytestream2_get_le32(&dgb);
429  u0 = (u0 << 4) | (u0 & 0xF);
430  v0 = (v0 << 4) | (v0 & 0xF);
431  u1 = (u1 << 4) | (u1 & 0xF);
432  v1 = (v1 << 4) | (v1 & 0xF);
433  udif = u1 - u0;
434  vdif = v1 - v0;
435 
436  for (int iii = 0; iii < 4; iii++) {
437  for (int jjj = 0; jjj < 4; jjj++) {
438  u[i + ii + iii][j + jj + jjj] = u0 + ((udif * (int)(loc & 3) + 2) / 3);
439  v[i + ii + iii][j + jj + jjj] = v0 + ((vdif * (int)(loc & 3) + 2) / 3);
440 
441  loc >>= 2;
442  }
443  }
444  }
445  }
446  }
447 
448  is8x8 >>= 1;
449  }
450  }
451  }
452 
453  for (int i = 0; i < 16; i++) {
454  for (int j = 0; j < 16; j++) {
455  dstu[x + i * ulinesize + j] = u[i][j];
456  dstv[x + i * vlinesize + j] = v[i][j];
457  }
458  }
459  }
460 
461  dstu += 16 * ulinesize;
462  dstv += 16 * vlinesize;
463  }
464 
465  return 0;
466 }
467 
468 static int decode_frame(AVCodecContext *avctx, AVFrame *p,
469  int *got_frame, AVPacket *avpkt)
470 {
471  NotchLCContext *s = avctx->priv_data;
472  GetByteContext *gb = &s->gb;
473  PutByteContext *pb = &s->pb;
474  unsigned uncompressed_size;
475  int ret;
476 
477  if (avpkt->size <= 40)
478  return AVERROR_INVALIDDATA;
479 
480  bytestream2_init(gb, avpkt->data, avpkt->size);
481 
482  if (bytestream2_get_le32(gb) != MKBETAG('N','L','C','1'))
483  return AVERROR_INVALIDDATA;
484 
485  uncompressed_size = bytestream2_get_le32(gb);
486  s->compressed_size = bytestream2_get_le32(gb);
487  s->format = bytestream2_get_le32(gb);
488 
489  if (s->format > 2)
490  return AVERROR_PATCHWELCOME;
491 
492  if (s->format == 0) {
493  ret = ff_lzf_uncompress(gb, &s->lzf_buffer, &s->lzf_size);
494  if (ret < 0)
495  return ret;
496 
497  if (uncompressed_size > s->lzf_size)
498  return AVERROR_INVALIDDATA;
499 
500  bytestream2_init(gb, s->lzf_buffer, uncompressed_size);
501  } else if (s->format == 1) {
502  if (bytestream2_get_bytes_left(gb) < uncompressed_size / 255)
503  return AVERROR_INVALIDDATA;
504 
505  av_fast_padded_malloc(&s->uncompressed_buffer, &s->uncompressed_size,
506  uncompressed_size);
507  if (!s->uncompressed_buffer)
508  return AVERROR(ENOMEM);
509 
510  bytestream2_init_writer(pb, s->uncompressed_buffer, s->uncompressed_size);
511 
512  ret = lz4_decompress(avctx, gb, pb);
513  if (ret != uncompressed_size)
514  return AVERROR_INVALIDDATA;
515 
516  bytestream2_init(gb, s->uncompressed_buffer, uncompressed_size);
517  }
518 
519  ret = decode_blocks(avctx, p, uncompressed_size);
520  if (ret < 0)
521  return ret;
522 
523  *got_frame = 1;
524 
525  return avpkt->size;
526 }
527 
529 {
530  NotchLCContext *s = avctx->priv_data;
531 
532  av_freep(&s->uncompressed_buffer);
533  s->uncompressed_size = 0;
534  av_freep(&s->lzf_buffer);
535  s->lzf_size = 0;
536 
537  return 0;
538 }
539 
541  .p.name = "notchlc",
542  CODEC_LONG_NAME("NotchLC"),
543  .p.type = AVMEDIA_TYPE_VIDEO,
544  .p.id = AV_CODEC_ID_NOTCHLC,
545  .priv_data_size = sizeof(NotchLCContext),
546  .init = decode_init,
547  .close = decode_end,
549  .p.capabilities = AV_CODEC_CAP_DR1 | AV_CODEC_CAP_FRAME_THREADS,
550 };
NotchLCContext::lzf_buffer
uint8_t * lzf_buffer
Definition: notchlc.c:42
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
AVCodecContext::colorspace
enum AVColorSpace colorspace
YUV colorspace type.
Definition: avcodec.h:691
GetByteContext
Definition: bytestream.h:33
NotchLCContext::y_data_offset
unsigned y_data_offset
Definition: notchlc.c:51
u
#define u(width, name, range_min, range_max)
Definition: cbs_h2645.c:251
av_clip_uintp2
#define av_clip_uintp2
Definition: common.h:124
int64_t
long long int64_t
Definition: coverity.c:34
bytestream2_seek
static av_always_inline int bytestream2_seek(GetByteContext *g, int offset, int whence)
Definition: bytestream.h:212
AVFrame
This structure describes decoded (raw) audio or video data.
Definition: frame.h:389
AVCodecContext::color_trc
enum AVColorTransferCharacteristic color_trc
Color Transfer Characteristic.
Definition: avcodec.h:684
AVCOL_RANGE_JPEG
@ AVCOL_RANGE_JPEG
Full range content.
Definition: pixfmt.h:686
AVPacket::data
uint8_t * data
Definition: packet.h:539
bytestream2_tell_p
static av_always_inline int bytestream2_tell_p(PutByteContext *p)
Definition: bytestream.h:197
FFCodec
Definition: codec_internal.h:127
AVCOL_SPC_RGB
@ AVCOL_SPC_RGB
order of coefficients is actually GBR, also IEC 61966-2-1 (sRGB), YZX and ST 428-1
Definition: pixfmt.h:610
NotchLCContext::compressed_size
unsigned compressed_size
Definition: notchlc.c:36
ff_set_dimensions
int ff_set_dimensions(AVCodecContext *s, int width, int height)
Check that the provided frame dimensions are valid and set them on the codec context.
Definition: utils.c:94
thread.h
AVFrame::data
uint8_t * data[AV_NUM_DATA_POINTERS]
pointer to the picture/channel planes.
Definition: frame.h:410
decode_blocks
static int decode_blocks(AVCodecContext *avctx, AVFrame *p, unsigned uncompressed_size)
Definition: notchlc.c:153
bit
#define bit(string, value)
Definition: cbs_mpeg2.c:56
get_bits
static unsigned int get_bits(GetBitContext *s, int n)
Read 1-25 bits.
Definition: get_bits.h:335
rgb
Definition: rpzaenc.c:60
FFCodec::p
AVCodec p
The public AVCodec.
Definition: codec_internal.h:131
AVCOL_TRC_IEC61966_2_1
@ AVCOL_TRC_IEC61966_2_1
IEC 61966-2-1 (sRGB or sYCC)
Definition: pixfmt.h:594
NotchLCContext::texture_size_x
unsigned texture_size_x
Definition: notchlc.c:45
GetBitContext
Definition: get_bits.h:108
NotchLCContext::format
unsigned format
Definition: notchlc.c:37
decode_init
static av_cold int decode_init(AVCodecContext *avctx)
Definition: notchlc.c:63
NotchLCContext::texture_size_y
unsigned texture_size_y
Definition: notchlc.c:46
AVCodecContext::color_primaries
enum AVColorPrimaries color_primaries
Chromaticity coordinates of the source primaries.
Definition: avcodec.h:677
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
NotchLCContext::pb
PutByteContext pb
Definition: notchlc.c:60
bytestream2_init_writer
static av_always_inline void bytestream2_init_writer(PutByteContext *p, uint8_t *buf, int buf_size)
Definition: bytestream.h:147
FF_CODEC_DECODE_CB
#define FF_CODEC_DECODE_CB(func)
Definition: codec_internal.h:311
s
#define s(width, name)
Definition: cbs_vp9.c:198
NotchLCContext::y_data_size
unsigned y_data_size
Definition: notchlc.c:53
bytestream2_put_buffer
static av_always_inline unsigned int bytestream2_put_buffer(PutByteContext *p, const uint8_t *src, unsigned int size)
Definition: bytestream.h:286
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:1049
GetByteContext::buffer
const uint8_t * buffer
Definition: bytestream.h:34
AV_PIX_FMT_YUVA444P12
#define AV_PIX_FMT_YUVA444P12
Definition: pixfmt.h:520
decode.h
get_bits.h
CODEC_LONG_NAME
#define CODEC_LONG_NAME(str)
Definition: codec_internal.h:296
AV_CODEC_CAP_FRAME_THREADS
#define AV_CODEC_CAP_FRAME_THREADS
Codec supports frame-level multithreading.
Definition: codec.h:110
NotchLCContext::lzf_size
int64_t lzf_size
Definition: notchlc.c:43
AVERROR_PATCHWELCOME
#define AVERROR_PATCHWELCOME
Not yet implemented in FFmpeg, patches welcome.
Definition: error.h:64
AVCodecContext::color_range
enum AVColorRange color_range
MPEG vs JPEG YUV range.
Definition: avcodec.h:701
NotchLCContext::y_control_data_offset
unsigned y_control_data_offset
Definition: notchlc.c:49
AVCOL_PRI_BT709
@ AVCOL_PRI_BT709
also ITU-R BT1361 / IEC 61966-2-4 / SMPTE RP 177 Annex B
Definition: pixfmt.h:557
NotchLCContext
Definition: notchlc.c:35
bytestream2_get_buffer
static av_always_inline unsigned int bytestream2_get_buffer(GetByteContext *g, uint8_t *dst, unsigned int size)
Definition: bytestream.h:267
bytestream2_get_bytes_left
static av_always_inline int bytestream2_get_bytes_left(GetByteContext *g)
Definition: bytestream.h:158
bytestream2_tell
static av_always_inline int bytestream2_tell(GetByteContext *g)
Definition: bytestream.h:192
HISTORY_SIZE
#define HISTORY_SIZE
Definition: notchlc.c:74
PutByteContext
Definition: bytestream.h:37
init
int(* init)(AVBSFContext *ctx)
Definition: dts2pts.c:368
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:540
codec_internal.h
NotchLCContext::gb
GetByteContext gb
Definition: notchlc.c:59
NotchLCContext::y_data_row_offsets
unsigned y_data_row_offsets
Definition: notchlc.c:47
MKBETAG
#define MKBETAG(a, b, c, d)
Definition: macros.h:56
ff_lzf_uncompress
int ff_lzf_uncompress(GetByteContext *gb, uint8_t **buf, int64_t *size)
Definition: lzf.c:40
NotchLCContext::uv_data_offset
unsigned uv_data_offset
Definition: notchlc.c:52
NotchLCContext::uv_count_offset
unsigned uv_count_offset
Definition: notchlc.c:55
offset
it s the only field you need to keep assuming you have a context There is some magic you don t need to care about around this just let it vf offset
Definition: writing_filters.txt:86
AV_CODEC_ID_NOTCHLC
@ AV_CODEC_ID_NOTCHLC
Definition: codec_id.h:302
NotchLCContext::uv_offset_data_offset
unsigned uv_offset_data_offset
Definition: notchlc.c:48
NotchLCContext::data_end
unsigned data_end
Definition: notchlc.c:57
i
#define i(width, name, range_min, range_max)
Definition: cbs_h2645.c:256
decode_frame
static int decode_frame(AVCodecContext *avctx, AVFrame *p, int *got_frame, AVPacket *avpkt)
Definition: notchlc.c:468
delta
float delta
Definition: vorbis_enc_data.h:430
av_fast_padded_malloc
void av_fast_padded_malloc(void *ptr, unsigned int *size, size_t min_size)
Same behaviour av_fast_malloc but the buffer has additional AV_INPUT_BUFFER_PADDING_SIZE at the end w...
Definition: utils.c:52
AVCodec::name
const char * name
Name of the codec implementation.
Definition: codec.h:194
AVCodecContext::height
int height
Definition: avcodec.h:624
AVCodecContext::pix_fmt
enum AVPixelFormat pix_fmt
Pixel format, see AV_PIX_FMT_xxx.
Definition: avcodec.h:663
avcodec.h
decode_end
static av_cold int decode_end(AVCodecContext *avctx)
Definition: notchlc.c:528
ret
ret
Definition: filter_design.txt:187
pos
unsigned int pos
Definition: spdifenc.c:414
AVCodecContext
main external API structure.
Definition: avcodec.h:451
NotchLCContext::uncompressed_size
unsigned uncompressed_size
Definition: notchlc.c:40
NotchLCContext::a_data_offset
unsigned a_data_offset
Definition: notchlc.c:54
ff_notchlc_decoder
const FFCodec ff_notchlc_decoder
Definition: notchlc.c:540
AVMEDIA_TYPE_VIDEO
@ AVMEDIA_TYPE_VIDEO
Definition: avutil.h:201
mem.h
lz4_decompress
static int lz4_decompress(AVCodecContext *avctx, GetByteContext *gb, PutByteContext *pb)
Definition: notchlc.c:76
AVPacket
This structure stores compressed data.
Definition: packet.h:516
AVCodecContext::priv_data
void * priv_data
Definition: avcodec.h:478
NotchLCContext::a_control_word_offset
unsigned a_control_word_offset
Definition: notchlc.c:50
av_freep
#define av_freep(p)
Definition: tableprint_vlc.h:34
AVCodecContext::width
int width
picture width / height.
Definition: avcodec.h:624
bytestream.h
bytestream2_init
static av_always_inline void bytestream2_init(GetByteContext *g, const uint8_t *buf, int buf_size)
Definition: bytestream.h:137
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:434
rgb
static const SheerTable rgb[2]
Definition: sheervideodata.h:32
AVERROR_INVALIDDATA
#define AVERROR_INVALIDDATA
Invalid data found when processing input.
Definition: error.h:61
NotchLCContext::uncompressed_buffer
uint8_t * uncompressed_buffer
Definition: notchlc.c:39
NotchLCContext::a_count_size
unsigned a_count_size
Definition: notchlc.c:56
lzf.h