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;
43  int64_t lzf_size;
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 (pos + num_literals < HISTORY_SIZE) {
97  bytestream2_get_buffer(gb, history + pos, num_literals);
98  pos += num_literals;
99  } else {
100  while (num_literals-- > 0) {
101  history[pos++] = bytestream2_get_byte(gb);
102  if (pos == HISTORY_SIZE) {
103  bytestream2_put_buffer(pb, history, HISTORY_SIZE);
104  pos = 0;
105  }
106  }
107  }
108 
109  if (bytestream2_get_bytes_left(gb) <= 0)
110  break;
111 
112  delta = bytestream2_get_le16(gb);
113  if (delta == 0)
114  return 0;
115  match_length = 4 + (token & 0x0F);
116  if (match_length == 4 + 0x0F) {
117  uint8_t current;
118 
119  do {
120  current = bytestream2_get_byte(gb);
121  match_length += current;
122  } while (current == 255);
123  }
124  reference_pos = (pos >= delta) ? (pos - delta) : (HISTORY_SIZE + pos - delta);
125  if (pos + match_length < HISTORY_SIZE && reference_pos + match_length < HISTORY_SIZE) {
126  if (pos >= reference_pos + match_length || reference_pos >= pos + match_length) {
127  memcpy(history + pos, history + reference_pos, match_length);
128  pos += match_length;
129  } else {
130  while (match_length-- > 0)
131  history[pos++] = history[reference_pos++];
132  }
133  } else {
134  while (match_length-- > 0) {
135  history[pos++] = history[reference_pos++];
136  if (pos == HISTORY_SIZE) {
137  bytestream2_put_buffer(pb, history, HISTORY_SIZE);
138  pos = 0;
139  }
140  reference_pos %= HISTORY_SIZE;
141  }
142  }
143  }
144 
145  bytestream2_put_buffer(pb, history, pos);
146 
147  return bytestream2_tell_p(pb);
148 }
149 
150 static int decode_blocks(AVCodecContext *avctx, AVFrame *p,
151  unsigned uncompressed_size)
152 {
153  NotchLCContext *s = avctx->priv_data;
154  GetByteContext rgb, dgb, *gb = &s->gb;
156  int ylinesize, ulinesize, vlinesize, alinesize;
157  uint16_t *dsty, *dstu, *dstv, *dsta;
158  int ret;
159 
160  s->texture_size_x = bytestream2_get_le32(gb);
161  s->texture_size_y = bytestream2_get_le32(gb);
162 
163  ret = ff_set_dimensions(avctx, s->texture_size_x, s->texture_size_y);
164  if (ret < 0)
165  return ret;
166 
167  s->uv_offset_data_offset = bytestream2_get_le32(gb);
168  if (s->uv_offset_data_offset >= UINT_MAX / 4)
169  return AVERROR_INVALIDDATA;
170  s->uv_offset_data_offset *= 4;
171  if (s->uv_offset_data_offset >= uncompressed_size)
172  return AVERROR_INVALIDDATA;
173 
174  s->y_control_data_offset = bytestream2_get_le32(gb);
175  if (s->y_control_data_offset >= UINT_MAX / 4)
176  return AVERROR_INVALIDDATA;
177  s->y_control_data_offset *= 4;
178  if (s->y_control_data_offset >= uncompressed_size)
179  return AVERROR_INVALIDDATA;
180 
181  s->a_control_word_offset = bytestream2_get_le32(gb);
182  if (s->a_control_word_offset >= UINT_MAX / 4)
183  return AVERROR_INVALIDDATA;
184  s->a_control_word_offset *= 4;
185  if (s->a_control_word_offset >= uncompressed_size)
186  return AVERROR_INVALIDDATA;
187 
188  s->uv_data_offset = bytestream2_get_le32(gb);
189  if (s->uv_data_offset >= UINT_MAX / 4)
190  return AVERROR_INVALIDDATA;
191  s->uv_data_offset *= 4;
192  if (s->uv_data_offset >= uncompressed_size)
193  return AVERROR_INVALIDDATA;
194 
195  s->y_data_size = bytestream2_get_le32(gb);
196  if (s->y_data_size >= UINT_MAX / 4)
197  return AVERROR_INVALIDDATA;
198 
199  s->a_data_offset = bytestream2_get_le32(gb);
200  if (s->a_data_offset >= UINT_MAX / 4)
201  return AVERROR_INVALIDDATA;
202  s->a_data_offset *= 4;
203  if (s->a_data_offset >= uncompressed_size)
204  return AVERROR_INVALIDDATA;
205 
206  s->a_count_size = bytestream2_get_le32(gb);
207  if (s->a_count_size >= UINT_MAX / 4)
208  return AVERROR_INVALIDDATA;
209  s->a_count_size *= 4;
210  if (s->a_count_size >= uncompressed_size)
211  return AVERROR_INVALIDDATA;
212 
213  s->data_end = bytestream2_get_le32(gb);
214  if (s->data_end > uncompressed_size)
215  return AVERROR_INVALIDDATA;
216 
217  s->y_data_row_offsets = bytestream2_tell(gb);
218  if (s->data_end <= s->y_data_size)
219  return AVERROR_INVALIDDATA;
220  s->y_data_offset = s->data_end - s->y_data_size;
221  if (s->y_data_offset <= s->a_data_offset)
222  return AVERROR_INVALIDDATA;
223  s->uv_count_offset = s->y_data_offset - s->a_data_offset;
224 
225  if ((ret = ff_thread_get_buffer(avctx, p, 0)) < 0)
226  return ret;
227 
228  rgb = *gb;
229  dgb = *gb;
230  bytestream2_seek(&rgb, s->y_data_row_offsets, SEEK_SET);
231  bytestream2_seek(gb, s->y_control_data_offset, SEEK_SET);
232 
233  if (bytestream2_get_bytes_left(gb) < (avctx->height + 3) / 4 * ((avctx->width + 3) / 4) * 4)
234  return AVERROR_INVALIDDATA;
235 
236  dsty = (uint16_t *)p->data[0];
237  dsta = (uint16_t *)p->data[3];
238  ylinesize = p->linesize[0] / 2;
239  alinesize = p->linesize[3] / 2;
240 
241  for (int y = 0; y < avctx->height; y += 4) {
242  const unsigned row_offset = bytestream2_get_le32(&rgb);
243 
244  bytestream2_seek(&dgb, s->y_data_offset + row_offset, SEEK_SET);
245 
247  for (int x = 0; x < avctx->width; x += 4) {
248  unsigned item = bytestream2_get_le32(gb);
249  unsigned y_min = item & 4095;
250  unsigned y_max = (item >> 12) & 4095;
251  unsigned y_diff = y_max - y_min;
252  unsigned control[4];
253 
254  control[0] = (item >> 24) & 3;
255  control[1] = (item >> 26) & 3;
256  control[2] = (item >> 28) & 3;
257  control[3] = (item >> 30) & 3;
258 
259  for (int i = 0; i < 4; i++) {
260  const int nb_bits = control[i] + 1;
261  const int div = (1 << nb_bits) - 1;
262  const int add = div - 1;
263 
264  dsty[x + i * ylinesize + 0] = av_clip_uintp2(y_min + ((y_diff * get_bits(&bit, nb_bits) + add) / div), 12);
265  dsty[x + i * ylinesize + 1] = av_clip_uintp2(y_min + ((y_diff * get_bits(&bit, nb_bits) + add) / div), 12);
266  dsty[x + i * ylinesize + 2] = av_clip_uintp2(y_min + ((y_diff * get_bits(&bit, nb_bits) + add) / div), 12);
267  dsty[x + i * ylinesize + 3] = av_clip_uintp2(y_min + ((y_diff * get_bits(&bit, nb_bits) + add) / div), 12);
268  }
269  }
270 
271  dsty += 4 * ylinesize;
272  }
273 
274  rgb = *gb;
275  dgb = *gb;
276  bytestream2_seek(gb, s->a_control_word_offset, SEEK_SET);
277  if (s->uv_count_offset == s->a_control_word_offset) {
278  for (int y = 0; y < avctx->height; y++) {
279  for (int x = 0; x < avctx->width; x++)
280  dsta[x] = 4095;
281  dsta += alinesize;
282  }
283  } else {
284  if (bytestream2_get_bytes_left(gb) < (avctx->height + 15) / 16 * ((avctx->width + 15) / 16) * 8)
285  return AVERROR_INVALIDDATA;
286 
287  for (int y = 0; y < avctx->height; y += 16) {
288  for (int x = 0; x < avctx->width; x += 16) {
289  unsigned m = bytestream2_get_le32(gb);
290  unsigned offset = bytestream2_get_le32(gb);
291  unsigned alpha0, alpha1;
292  uint64_t control;
293 
294  if (offset >= UINT_MAX / 4)
295  return AVERROR_INVALIDDATA;
296  offset = offset * 4 + s->uv_data_offset + s->a_data_offset;
297  if (offset >= s->data_end)
298  return AVERROR_INVALIDDATA;
299 
300  bytestream2_seek(&dgb, offset, SEEK_SET);
301  control = bytestream2_get_le64(&dgb);
302  alpha0 = control & 0xFF;
303  alpha1 = (control >> 8) & 0xFF;
304  control = control >> 16;
305 
306  for (int by = 0; by < 4; by++) {
307  for (int bx = 0; bx < 4; bx++) {
308  switch (m & 3) {
309  case 0:
310  for (int i = 0; i < 4; i++) {
311  for (int j = 0; j < 4; j++) {
312  dsta[x + (i + by * 4) * alinesize + bx * 4 + j] = 0;
313  }
314  }
315  break;
316  case 1:
317  for (int i = 0; i < 4; i++) {
318  for (int j = 0; j < 4; j++) {
319  dsta[x + (i + by * 4) * alinesize + bx * 4 + j] = 4095;
320  }
321  }
322  break;
323  case 2:
324  for (int i = 0; i < 4; i++) {
325  for (int j = 0; j < 4; j++) {
326  dsta[x + (i + by * 4) * alinesize + bx * 4 + j] = (alpha0 + (alpha1 - alpha0) * (control & 7)) << 4;
327  }
328  }
329  break;
330  default:
331  return AVERROR_INVALIDDATA;
332  }
333 
334  control >>= 3;
335  m >>= 2;
336  }
337  }
338  }
339 
340  dsta += 16 * alinesize;
341  }
342  }
343 
344  bytestream2_seek(&rgb, s->uv_offset_data_offset, SEEK_SET);
345 
346  dstu = (uint16_t *)p->data[1];
347  dstv = (uint16_t *)p->data[2];
348  ulinesize = p->linesize[1] / 2;
349  vlinesize = p->linesize[2] / 2;
350 
351  for (int y = 0; y < avctx->height; y += 16) {
352  for (int x = 0; x < avctx->width; x += 16) {
353  unsigned offset = bytestream2_get_le32(&rgb) * 4;
354  int u[16][16] = { 0 }, v[16][16] = { 0 };
355  int u0, v0, u1, v1, udif, vdif;
356  unsigned escape, is8x8, loc;
357 
358  bytestream2_seek(&dgb, s->uv_data_offset + offset, SEEK_SET);
359 
360  is8x8 = bytestream2_get_le16(&dgb);
361  escape = bytestream2_get_le16(&dgb);
362 
363  if (escape == 0 && is8x8 == 0) {
364  u0 = bytestream2_get_byte(&dgb);
365  v0 = bytestream2_get_byte(&dgb);
366  u1 = bytestream2_get_byte(&dgb);
367  v1 = bytestream2_get_byte(&dgb);
368  loc = bytestream2_get_le32(&dgb);
369  u0 = (u0 << 4) | (u0 & 0xF);
370  v0 = (v0 << 4) | (v0 & 0xF);
371  u1 = (u1 << 4) | (u1 & 0xF);
372  v1 = (v1 << 4) | (v1 & 0xF);
373  udif = u1 - u0;
374  vdif = v1 - v0;
375 
376  for (int i = 0; i < 16; i += 4) {
377  for (int j = 0; j < 16; j += 4) {
378  for (int ii = 0; ii < 4; ii++) {
379  for (int jj = 0; jj < 4; jj++) {
380  u[i + ii][j + jj] = u0 + ((udif * (int)(loc & 3) + 2) / 3);
381  v[i + ii][j + jj] = v0 + ((vdif * (int)(loc & 3) + 2) / 3);
382  }
383  }
384 
385  loc >>= 2;
386  }
387  }
388  } else {
389  for (int i = 0; i < 16; i += 8) {
390  for (int j = 0; j < 16; j += 8) {
391  if (is8x8 & 1) {
392  u0 = bytestream2_get_byte(&dgb);
393  v0 = bytestream2_get_byte(&dgb);
394  u1 = bytestream2_get_byte(&dgb);
395  v1 = bytestream2_get_byte(&dgb);
396  loc = bytestream2_get_le32(&dgb);
397  u0 = (u0 << 4) | (u0 & 0xF);
398  v0 = (v0 << 4) | (v0 & 0xF);
399  u1 = (u1 << 4) | (u1 & 0xF);
400  v1 = (v1 << 4) | (v1 & 0xF);
401  udif = u1 - u0;
402  vdif = v1 - v0;
403 
404  for (int ii = 0; ii < 8; ii += 2) {
405  for (int jj = 0; jj < 8; jj += 2) {
406  for (int iii = 0; iii < 2; iii++) {
407  for (int jjj = 0; jjj < 2; jjj++) {
408  u[i + ii + iii][j + jj + jjj] = u0 + ((udif * (int)(loc & 3) + 2) / 3);
409  v[i + ii + iii][j + jj + jjj] = v0 + ((vdif * (int)(loc & 3) + 2) / 3);
410  }
411  }
412 
413  loc >>= 2;
414  }
415  }
416  } else if (escape) {
417  for (int ii = 0; ii < 8; ii += 4) {
418  for (int jj = 0; jj < 8; jj += 4) {
419  u0 = bytestream2_get_byte(&dgb);
420  v0 = bytestream2_get_byte(&dgb);
421  u1 = bytestream2_get_byte(&dgb);
422  v1 = bytestream2_get_byte(&dgb);
423  loc = bytestream2_get_le32(&dgb);
424  u0 = (u0 << 4) | (u0 & 0xF);
425  v0 = (v0 << 4) | (v0 & 0xF);
426  u1 = (u1 << 4) | (u1 & 0xF);
427  v1 = (v1 << 4) | (v1 & 0xF);
428  udif = u1 - u0;
429  vdif = v1 - v0;
430 
431  for (int iii = 0; iii < 4; iii++) {
432  for (int jjj = 0; jjj < 4; jjj++) {
433  u[i + ii + iii][j + jj + jjj] = u0 + ((udif * (int)(loc & 3) + 2) / 3);
434  v[i + ii + iii][j + jj + jjj] = v0 + ((vdif * (int)(loc & 3) + 2) / 3);
435 
436  loc >>= 2;
437  }
438  }
439  }
440  }
441  }
442 
443  is8x8 >>= 1;
444  }
445  }
446  }
447 
448  for (int i = 0; i < 16; i++) {
449  for (int j = 0; j < 16; j++) {
450  dstu[x + i * ulinesize + j] = u[i][j];
451  dstv[x + i * vlinesize + j] = v[i][j];
452  }
453  }
454  }
455 
456  dstu += 16 * ulinesize;
457  dstv += 16 * vlinesize;
458  }
459 
460  return 0;
461 }
462 
463 static int decode_frame(AVCodecContext *avctx, AVFrame *p,
464  int *got_frame, AVPacket *avpkt)
465 {
466  NotchLCContext *s = avctx->priv_data;
467  GetByteContext *gb = &s->gb;
468  PutByteContext *pb = &s->pb;
469  unsigned uncompressed_size;
470  int ret;
471 
472  if (avpkt->size <= 40)
473  return AVERROR_INVALIDDATA;
474 
475  bytestream2_init(gb, avpkt->data, avpkt->size);
476 
477  if (bytestream2_get_le32(gb) != MKBETAG('N','L','C','1'))
478  return AVERROR_INVALIDDATA;
479 
480  uncompressed_size = bytestream2_get_le32(gb);
481  s->compressed_size = bytestream2_get_le32(gb);
482  s->format = bytestream2_get_le32(gb);
483 
484  if (s->format > 2)
485  return AVERROR_PATCHWELCOME;
486 
487  if (s->format == 0) {
488  ret = ff_lzf_uncompress(gb, &s->lzf_buffer, &s->lzf_size);
489  if (ret < 0)
490  return ret;
491 
492  if (uncompressed_size > s->lzf_size)
493  return AVERROR_INVALIDDATA;
494 
495  bytestream2_init(gb, s->lzf_buffer, uncompressed_size);
496  } else if (s->format == 1) {
497  if (bytestream2_get_bytes_left(gb) < uncompressed_size / 255)
498  return AVERROR_INVALIDDATA;
499 
500  av_fast_padded_malloc(&s->uncompressed_buffer, &s->uncompressed_size,
501  uncompressed_size);
502  if (!s->uncompressed_buffer)
503  return AVERROR(ENOMEM);
504 
505  bytestream2_init_writer(pb, s->uncompressed_buffer, s->uncompressed_size);
506 
507  ret = lz4_decompress(avctx, gb, pb);
508  if (ret != uncompressed_size)
509  return AVERROR_INVALIDDATA;
510 
511  bytestream2_init(gb, s->uncompressed_buffer, uncompressed_size);
512  }
513 
514  ret = decode_blocks(avctx, p, uncompressed_size);
515  if (ret < 0)
516  return ret;
517 
519  p->flags |= AV_FRAME_FLAG_KEY;
520 
521  *got_frame = 1;
522 
523  return avpkt->size;
524 }
525 
527 {
528  NotchLCContext *s = avctx->priv_data;
529 
530  av_freep(&s->uncompressed_buffer);
531  s->uncompressed_size = 0;
532  av_freep(&s->lzf_buffer);
533  s->lzf_size = 0;
534 
535  return 0;
536 }
537 
539  .p.name = "notchlc",
540  CODEC_LONG_NAME("NotchLC"),
541  .p.type = AVMEDIA_TYPE_VIDEO,
542  .p.id = AV_CODEC_ID_NOTCHLC,
543  .priv_data_size = sizeof(NotchLCContext),
544  .init = decode_init,
545  .close = decode_end,
547  .p.capabilities = AV_CODEC_CAP_DR1 | AV_CODEC_CAP_FRAME_THREADS,
548 };
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:685
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:123
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:375
AVCodecContext::color_trc
enum AVColorTransferCharacteristic color_trc
Color Transfer Characteristic.
Definition: avcodec.h:678
AVCOL_RANGE_JPEG
@ AVCOL_RANGE_JPEG
Full range content.
Definition: pixfmt.h:686
AVPacket::data
uint8_t * data
Definition: packet.h:524
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
AVFrame::flags
int flags
Frame flags, a combination of AV_FRAME_FLAGS.
Definition: frame.h:647
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:396
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 FFCodec caps_internal and use ff_thread_get_buffer() to allocate frames. 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
decode_blocks
static int decode_blocks(AVCodecContext *avctx, AVFrame *p, unsigned uncompressed_size)
Definition: notchlc.c:150
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
v0
#define v0
Definition: regdef.h:26
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:671
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
AV_FRAME_FLAG_KEY
#define AV_FRAME_FLAG_KEY
A flag to mark frames that are keyframes.
Definition: frame.h:626
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:287
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
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:272
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:695
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
AV_PICTURE_TYPE_I
@ AV_PICTURE_TYPE_I
Intra.
Definition: avutil.h:279
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
AVFrame::pict_type
enum AVPictureType pict_type
Picture type of the frame.
Definition: frame.h:477
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
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:463
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:618
AVCodecContext::pix_fmt
enum AVPixelFormat pix_fmt
Pixel format, see AV_PIX_FMT_xxx.
Definition: avcodec.h:657
avcodec.h
decode_end
static av_cold int decode_end(AVCodecContext *avctx)
Definition: notchlc.c:526
ret
ret
Definition: filter_design.txt:187
pos
unsigned int pos
Definition: spdifenc.c:414
AVCodecContext
main external API structure.
Definition: avcodec.h:445
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:538
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:501
AVCodecContext::priv_data
void * priv_data
Definition: avcodec.h:472
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:618
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:420
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
int
int
Definition: ffmpeg_filter.c:424
lzf.h