FFmpeg coverage


Directory: ../../../ffmpeg/
File: src/libavcodec/notchlc.c
Date: 2022-07-04 00:18:54
Exec Total Coverage
Lines: 0 312 0.0%
Branches: 0 182 0.0%

Line Branch Exec Source
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 <stdlib.h>
24 #include <string.h>
25
26 #define BITSTREAM_READER_LE
27 #include "libavutil/intreadwrite.h"
28 #include "avcodec.h"
29 #include "bytestream.h"
30 #include "codec_internal.h"
31 #include "get_bits.h"
32 #include "internal.h"
33 #include "lzf.h"
34 #include "thread.h"
35
36 typedef struct NotchLCContext {
37 unsigned compressed_size;
38 unsigned format;
39
40 uint8_t *uncompressed_buffer;
41 unsigned uncompressed_size;
42
43 uint8_t *lzf_buffer;
44 int64_t lzf_size;
45
46 unsigned texture_size_x;
47 unsigned texture_size_y;
48 unsigned y_data_row_offsets;
49 unsigned uv_offset_data_offset;
50 unsigned y_control_data_offset;
51 unsigned a_control_word_offset;
52 unsigned y_data_offset;
53 unsigned uv_data_offset;
54 unsigned y_data_size;
55 unsigned a_data_offset;
56 unsigned uv_count_offset;
57 unsigned a_count_size;
58 unsigned data_end;
59
60 GetByteContext gb;
61 PutByteContext pb;
62 } NotchLCContext;
63
64 static av_cold int decode_init(AVCodecContext *avctx)
65 {
66 avctx->pix_fmt = AV_PIX_FMT_YUVA444P12;
67 avctx->color_range = AVCOL_RANGE_JPEG;
68 avctx->colorspace = AVCOL_SPC_RGB;
69 avctx->color_primaries = AVCOL_PRI_BT709;
70 avctx->color_trc = AVCOL_TRC_IEC61966_2_1;
71
72 return 0;
73 }
74
75 #define HISTORY_SIZE (64 * 1024)
76
77 static int lz4_decompress(AVCodecContext *avctx,
78 GetByteContext *gb,
79 PutByteContext *pb)
80 {
81 unsigned reference_pos, match_length, delta, pos = 0;
82 uint8_t history[64 * 1024];
83
84 while (bytestream2_get_bytes_left(gb) > 0) {
85 uint8_t token = bytestream2_get_byte(gb);
86 unsigned 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;
155 GetBitContext bit;
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
246 init_get_bits8(&bit, dgb.buffer, bytestream2_get_bytes_left(&dgb));
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
518 p->pict_type = AV_PICTURE_TYPE_I;
519 p->key_frame = 1;
520
521 *got_frame = 1;
522
523 return avpkt->size;
524 }
525
526 static av_cold int decode_end(AVCodecContext *avctx)
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
538 const FFCodec ff_notchlc_decoder = {
539 .p.name = "notchlc",
540 .p.long_name = NULL_IF_CONFIG_SMALL("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,
546 FF_CODEC_DECODE_CB(decode_frame),
547 .p.capabilities = AV_CODEC_CAP_DR1 | AV_CODEC_CAP_FRAME_THREADS,
548 .caps_internal = FF_CODEC_CAP_INIT_THREADSAFE,
549 };
550