FFmpeg coverage

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 <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
39			uint8_t *uncompressed_buffer;
40			unsigned uncompressed_size;
41
42			uint8_t *lzf_buffer;
43			int64_t lzf_size;
44
45			unsigned texture_size_x;
46			unsigned texture_size_y;
47			unsigned y_data_row_offsets;
48			unsigned uv_offset_data_offset;
49			unsigned y_control_data_offset;
50			unsigned a_control_word_offset;
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
59			GetByteContext gb;
60			PutByteContext pb;
61			} NotchLCContext;
62
63		✗	static av_cold int decode_init(AVCodecContext *avctx)
64			{
65		✗	avctx->pix_fmt = AV_PIX_FMT_YUVA444P12;
66		✗	avctx->color_range = AVCOL_RANGE_JPEG;
67		✗	avctx->colorspace = AVCOL_SPC_RGB;
68		✗	avctx->color_primaries = AVCOL_PRI_BT709;
69		✗	avctx->color_trc = AVCOL_TRC_IEC61966_2_1;
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;
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->flags |= AV_FRAME_FLAG_KEY;
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			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,
546			FF_CODEC_DECODE_CB(decode_frame),
547			.p.capabilities = AV_CODEC_CAP_DR1 | AV_CODEC_CAP_FRAME_THREADS,
548			};
549