3 * Copyright (c) 2020 Paul B Mahol
5 * This file is part of FFmpeg.
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.
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.
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
26 #define BITSTREAM_READER_LE
27 #include "libavutil/intreadwrite.h"
29 #include "bytestream.h"
35 typedef struct NotchLCContext {
36 unsigned compressed_size;
39 uint8_t *uncompressed_buffer;
40 unsigned uncompressed_size;
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;
54 unsigned a_data_offset;
55 unsigned uv_count_offset;
56 unsigned a_count_size;
63 static av_cold int decode_init(AVCodecContext *avctx)
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;
74 #define HISTORY_SIZE (64 * 1024)
76 static int lz4_decompress(AVCodecContext *avctx,
80 unsigned reference_pos, match_length, delta, pos = 0;
81 uint8_t history[64 * 1024];
83 while (bytestream2_get_bytes_left(gb) > 0) {
84 uint8_t token = bytestream2_get_byte(gb);
85 unsigned num_literals = token >> 4;
87 if (num_literals == 15) {
88 unsigned char current;
90 current = bytestream2_get_byte(gb);
91 num_literals += current;
92 } while (current == 255);
95 if (pos + num_literals < HISTORY_SIZE) {
96 bytestream2_get_buffer(gb, history + pos, num_literals);
99 while (num_literals-- > 0) {
100 history[pos++] = bytestream2_get_byte(gb);
101 if (pos == HISTORY_SIZE) {
102 bytestream2_put_buffer(pb, history, HISTORY_SIZE);
108 if (bytestream2_get_bytes_left(gb) <= 0)
111 delta = bytestream2_get_le16(gb);
114 match_length = 4 + (token & 0x0F);
115 if (match_length == 4 + 0x0F) {
119 current = bytestream2_get_byte(gb);
120 match_length += current;
121 } while (current == 255);
123 reference_pos = (pos >= delta) ? (pos - delta) : (HISTORY_SIZE + pos - delta);
124 if (pos + match_length < HISTORY_SIZE && reference_pos + match_length < HISTORY_SIZE) {
125 if (pos >= reference_pos + match_length || reference_pos >= pos + match_length) {
126 memcpy(history + pos, history + reference_pos, match_length);
129 while (match_length-- > 0)
130 history[pos++] = history[reference_pos++];
133 while (match_length-- > 0) {
134 history[pos++] = history[reference_pos++];
135 if (pos == HISTORY_SIZE) {
136 bytestream2_put_buffer(pb, history, HISTORY_SIZE);
139 reference_pos %= HISTORY_SIZE;
144 bytestream2_put_buffer(pb, history, pos);
146 return bytestream2_tell_p(pb);
149 static int decode_blocks(AVCodecContext *avctx, AVFrame *p, ThreadFrame *frame,
150 unsigned uncompressed_size)
152 NotchLCContext *s = avctx->priv_data;
153 GetByteContext rgb, dgb, *gb = &s->gb;
155 int ylinesize, ulinesize, vlinesize, alinesize;
156 uint16_t *dsty, *dstu, *dstv, *dsta;
159 s->texture_size_x = bytestream2_get_le32(gb);
160 s->texture_size_y = bytestream2_get_le32(gb);
162 ret = ff_set_dimensions(avctx, s->texture_size_x, s->texture_size_y);
166 s->uv_offset_data_offset = bytestream2_get_le32(gb);
167 if (s->uv_offset_data_offset >= UINT_MAX / 4)
168 return AVERROR_INVALIDDATA;
169 s->uv_offset_data_offset *= 4;
170 if (s->uv_offset_data_offset >= uncompressed_size)
171 return AVERROR_INVALIDDATA;
173 s->y_control_data_offset = bytestream2_get_le32(gb);
174 if (s->y_control_data_offset >= UINT_MAX / 4)
175 return AVERROR_INVALIDDATA;
176 s->y_control_data_offset *= 4;
177 if (s->y_control_data_offset >= uncompressed_size)
178 return AVERROR_INVALIDDATA;
180 s->a_control_word_offset = bytestream2_get_le32(gb);
181 if (s->a_control_word_offset >= UINT_MAX / 4)
182 return AVERROR_INVALIDDATA;
183 s->a_control_word_offset *= 4;
184 if (s->a_control_word_offset >= uncompressed_size)
185 return AVERROR_INVALIDDATA;
187 s->uv_data_offset = bytestream2_get_le32(gb);
188 if (s->uv_data_offset >= UINT_MAX / 4)
189 return AVERROR_INVALIDDATA;
190 s->uv_data_offset *= 4;
191 if (s->uv_data_offset >= uncompressed_size)
192 return AVERROR_INVALIDDATA;
194 s->y_data_size = bytestream2_get_le32(gb);
195 if (s->y_data_size >= UINT_MAX / 4)
196 return AVERROR_INVALIDDATA;
198 s->a_data_offset = bytestream2_get_le32(gb);
199 if (s->a_data_offset >= UINT_MAX / 4)
200 return AVERROR_INVALIDDATA;
201 s->a_data_offset *= 4;
202 if (s->a_data_offset >= uncompressed_size)
203 return AVERROR_INVALIDDATA;
205 s->a_count_size = bytestream2_get_le32(gb);
206 if (s->a_count_size >= UINT_MAX / 4)
207 return AVERROR_INVALIDDATA;
208 s->a_count_size *= 4;
209 if (s->a_count_size >= uncompressed_size)
210 return AVERROR_INVALIDDATA;
212 s->data_end = bytestream2_get_le32(gb);
213 if (s->data_end > uncompressed_size)
214 return AVERROR_INVALIDDATA;
216 s->y_data_row_offsets = bytestream2_tell(gb);
217 if (s->data_end <= s->y_data_size)
218 return AVERROR_INVALIDDATA;
219 s->y_data_offset = s->data_end - s->y_data_size;
220 if (s->y_data_offset <= s->a_data_offset)
221 return AVERROR_INVALIDDATA;
222 s->uv_count_offset = s->y_data_offset - s->a_data_offset;
224 if ((ret = ff_thread_get_buffer(avctx, frame, 0)) < 0)
229 bytestream2_seek(&rgb, s->y_data_row_offsets, SEEK_SET);
230 bytestream2_seek(gb, s->y_control_data_offset, SEEK_SET);
232 dsty = (uint16_t *)p->data[0];
233 dsta = (uint16_t *)p->data[3];
234 ylinesize = p->linesize[0] / 2;
235 alinesize = p->linesize[3] / 2;
237 for (int y = 0; y < avctx->height; y += 4) {
238 const unsigned row_offset = bytestream2_get_le32(&rgb);
240 bytestream2_seek(&dgb, s->y_data_offset + row_offset, SEEK_SET);
242 init_get_bits8(&bit, dgb.buffer, bytestream2_get_bytes_left(&dgb));
243 for (int x = 0; x < avctx->width; x += 4) {
244 unsigned item = bytestream2_get_le32(gb);
245 unsigned y_min = item & 4095;
246 unsigned y_max = (item >> 12) & 4095;
247 unsigned y_diff = y_max - y_min;
250 control[0] = (item >> 24) & 3;
251 control[1] = (item >> 26) & 3;
252 control[2] = (item >> 28) & 3;
253 control[3] = (item >> 30) & 3;
255 for (int i = 0; i < 4; i++) {
256 const int nb_bits = control[i] + 1;
257 const int div = (1 << nb_bits) - 1;
258 const int add = div - 1;
260 dsty[x + i * ylinesize + 0] = av_clip_uintp2(y_min + ((y_diff * get_bits(&bit, nb_bits) + add) / div), 12);
261 dsty[x + i * ylinesize + 1] = av_clip_uintp2(y_min + ((y_diff * get_bits(&bit, nb_bits) + add) / div), 12);
262 dsty[x + i * ylinesize + 2] = av_clip_uintp2(y_min + ((y_diff * get_bits(&bit, nb_bits) + add) / div), 12);
263 dsty[x + i * ylinesize + 3] = av_clip_uintp2(y_min + ((y_diff * get_bits(&bit, nb_bits) + add) / div), 12);
267 dsty += 4 * ylinesize;
272 bytestream2_seek(gb, s->a_control_word_offset, SEEK_SET);
273 if (s->uv_count_offset == s->a_control_word_offset) {
274 for (int y = 0; y < avctx->height; y++) {
275 for (int x = 0; x < avctx->width; x++)
280 for (int y = 0; y < avctx->height; y += 16) {
281 for (int x = 0; x < avctx->width; x += 16) {
282 unsigned m = bytestream2_get_le32(gb);
283 unsigned offset = bytestream2_get_le32(gb);
284 unsigned alpha0, alpha1;
287 if (offset >= UINT_MAX / 4)
288 return AVERROR_INVALIDDATA;
289 offset = offset * 4 + s->uv_data_offset + s->a_data_offset;
290 if (offset >= s->data_end)
291 return AVERROR_INVALIDDATA;
293 bytestream2_seek(&dgb, offset, SEEK_SET);
294 control = bytestream2_get_le64(&dgb);
295 alpha0 = control & 0xFF;
296 alpha1 = (control >> 8) & 0xFF;
297 control = control >> 16;
299 for (int by = 0; by < 4; by++) {
300 for (int bx = 0; bx < 4; bx++) {
303 for (int i = 0; i < 4; i++) {
304 for (int j = 0; j < 4; j++) {
305 dsta[x + (i + by * 4) * alinesize + bx * 4 + j] = 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] = 4095;
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] = (alpha0 + (alpha1 - alpha0) * (control & 7)) << 4;
324 return AVERROR_INVALIDDATA;
333 dsta += 16 * alinesize;
337 bytestream2_seek(&rgb, s->uv_offset_data_offset, SEEK_SET);
339 dstu = (uint16_t *)p->data[1];
340 dstv = (uint16_t *)p->data[2];
341 ulinesize = p->linesize[1] / 2;
342 vlinesize = p->linesize[2] / 2;
344 for (int y = 0; y < avctx->height; y += 16) {
345 for (int x = 0; x < avctx->width; x += 16) {
346 unsigned offset = bytestream2_get_le32(&rgb) * 4;
347 int u[16][16] = { 0 }, v[16][16] = { 0 };
348 int u0, v0, u1, v1, udif, vdif;
349 unsigned escape, is8x8, loc;
351 bytestream2_seek(&dgb, s->uv_data_offset + offset, SEEK_SET);
353 is8x8 = bytestream2_get_le16(&dgb);
354 escape = bytestream2_get_le16(&dgb);
356 if (escape == 0 && is8x8 == 0) {
357 u0 = bytestream2_get_byte(&dgb);
358 v0 = bytestream2_get_byte(&dgb);
359 u1 = bytestream2_get_byte(&dgb);
360 v1 = bytestream2_get_byte(&dgb);
361 loc = bytestream2_get_le32(&dgb);
362 u0 = (u0 << 4) | (u0 & 0xF);
363 v0 = (v0 << 4) | (v0 & 0xF);
364 u1 = (u1 << 4) | (u1 & 0xF);
365 v1 = (v1 << 4) | (v1 & 0xF);
369 for (int i = 0; i < 16; i += 4) {
370 for (int j = 0; j < 16; j += 4) {
371 for (int ii = 0; ii < 4; ii++) {
372 for (int jj = 0; jj < 4; jj++) {
373 u[i + ii][j + jj] = u0 + ((udif * (int)(loc & 3) + 2) / 3);
374 v[i + ii][j + jj] = v0 + ((vdif * (int)(loc & 3) + 2) / 3);
382 for (int i = 0; i < 16; i += 8) {
383 for (int j = 0; j < 16; j += 8) {
385 u0 = bytestream2_get_byte(&dgb);
386 v0 = bytestream2_get_byte(&dgb);
387 u1 = bytestream2_get_byte(&dgb);
388 v1 = bytestream2_get_byte(&dgb);
389 loc = bytestream2_get_le32(&dgb);
390 u0 = (u0 << 4) | (u0 & 0xF);
391 v0 = (v0 << 4) | (v0 & 0xF);
392 u1 = (u1 << 4) | (u1 & 0xF);
393 v1 = (v1 << 4) | (v1 & 0xF);
397 for (int ii = 0; ii < 8; ii += 2) {
398 for (int jj = 0; jj < 8; jj += 2) {
399 for (int iii = 0; iii < 2; iii++) {
400 for (int jjj = 0; jjj < 2; jjj++) {
401 u[i + ii + iii][j + jj + jjj] = u0 + ((udif * (int)(loc & 3) + 2) / 3);
402 v[i + ii + iii][j + jj + jjj] = v0 + ((vdif * (int)(loc & 3) + 2) / 3);
410 for (int ii = 0; ii < 8; ii += 4) {
411 for (int jj = 0; jj < 8; jj += 4) {
412 u0 = bytestream2_get_byte(&dgb);
413 v0 = bytestream2_get_byte(&dgb);
414 u1 = bytestream2_get_byte(&dgb);
415 v1 = bytestream2_get_byte(&dgb);
416 loc = bytestream2_get_le32(&dgb);
417 u0 = (u0 << 4) | (u0 & 0xF);
418 v0 = (v0 << 4) | (v0 & 0xF);
419 u1 = (u1 << 4) | (u1 & 0xF);
420 v1 = (v1 << 4) | (v1 & 0xF);
424 for (int iii = 0; iii < 4; iii++) {
425 for (int jjj = 0; jjj < 4; jjj++) {
426 u[i + ii + iii][j + jj + jjj] = u0 + ((udif * (int)(loc & 3) + 2) / 3);
427 v[i + ii + iii][j + jj + jjj] = v0 + ((vdif * (int)(loc & 3) + 2) / 3);
441 for (int i = 0; i < 16; i++) {
442 for (int j = 0; j < 16; j++) {
443 dstu[x + i * ulinesize + j] = u[i][j];
444 dstv[x + i * vlinesize + j] = v[i][j];
449 dstu += 16 * ulinesize;
450 dstv += 16 * vlinesize;
456 static int decode_frame(AVCodecContext *avctx,
457 void *data, int *got_frame,
460 NotchLCContext *s = avctx->priv_data;
461 ThreadFrame frame = { .f = data };
462 GetByteContext *gb = &s->gb;
463 PutByteContext *pb = &s->pb;
464 unsigned uncompressed_size;
468 if (avpkt->size <= 40)
469 return AVERROR_INVALIDDATA;
471 bytestream2_init(gb, avpkt->data, avpkt->size);
473 if (bytestream2_get_le32(gb) != MKBETAG('N','L','C','1'))
474 return AVERROR_INVALIDDATA;
476 uncompressed_size = bytestream2_get_le32(gb);
477 s->compressed_size = bytestream2_get_le32(gb);
478 s->format = bytestream2_get_le32(gb);
481 return AVERROR_PATCHWELCOME;
483 if (s->format == 0) {
484 ret = ff_lzf_uncompress(gb, &s->lzf_buffer, &s->lzf_size);
488 if (uncompressed_size > s->lzf_size)
489 return AVERROR_INVALIDDATA;
491 bytestream2_init(gb, s->lzf_buffer, uncompressed_size);
492 } else if (s->format == 1) {
493 av_fast_padded_malloc(&s->uncompressed_buffer, &s->uncompressed_size,
495 if (!s->uncompressed_buffer)
496 return AVERROR(ENOMEM);
498 bytestream2_init_writer(pb, s->uncompressed_buffer, s->uncompressed_size);
500 ret = lz4_decompress(avctx, gb, pb);
501 if (ret != uncompressed_size)
502 return AVERROR_INVALIDDATA;
504 bytestream2_init(gb, s->uncompressed_buffer, uncompressed_size);
507 ret = decode_blocks(avctx, p, &frame, uncompressed_size);
511 p->pict_type = AV_PICTURE_TYPE_I;
519 static av_cold int decode_end(AVCodecContext *avctx)
521 NotchLCContext *s = avctx->priv_data;
523 av_freep(&s->uncompressed_buffer);
524 s->uncompressed_size = 0;
525 av_freep(&s->lzf_buffer);
531 AVCodec ff_notchlc_decoder = {
533 .long_name = NULL_IF_CONFIG_SMALL("NotchLC"),
534 .type = AVMEDIA_TYPE_VIDEO,
535 .id = AV_CODEC_ID_NOTCHLC,
536 .priv_data_size = sizeof(NotchLCContext),
539 .decode = decode_frame,
540 .capabilities = AV_CODEC_CAP_DR1 | AV_CODEC_CAP_FRAME_THREADS,