File size: 15,695 Bytes
8ead80b |
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 101 102 103 104 105 106 107 108 109 110 111 112 113 114 115 116 117 118 119 120 121 122 123 124 125 126 127 128 129 130 131 132 133 134 135 136 137 138 139 140 141 142 143 144 145 146 147 148 149 150 151 152 153 154 155 156 157 158 159 160 161 162 163 164 165 166 167 168 169 170 171 172 173 174 175 176 177 178 179 180 181 182 183 184 185 186 187 188 189 190 191 192 193 194 195 196 197 198 199 200 201 202 203 204 205 206 207 208 209 210 211 212 213 214 215 216 217 218 219 220 221 222 223 224 225 226 227 228 229 230 231 232 233 234 235 236 237 238 239 240 241 242 243 244 245 246 247 248 249 250 251 252 253 254 255 256 257 258 259 260 261 262 263 264 265 266 267 268 269 270 271 272 273 274 275 276 277 278 279 280 281 282 283 284 285 286 287 288 289 290 291 292 293 294 295 296 297 298 299 300 301 302 303 304 305 306 307 308 309 310 311 312 313 314 315 316 317 318 319 320 321 322 323 324 325 326 327 328 329 330 331 332 333 334 335 336 337 338 339 340 341 342 343 344 345 346 347 348 349 350 351 352 353 354 355 356 357 358 359 360 361 362 363 364 365 366 367 368 369 370 371 372 373 374 375 376 377 378 379 380 381 382 383 384 385 386 387 388 389 390 391 392 393 394 395 396 397 398 399 400 401 402 403 404 405 406 407 408 409 410 411 412 413 414 415 416 417 418 419 420 421 422 423 424 425 426 427 428 429 430 431 432 433 434 435 436 437 438 439 440 441 442 443 444 445 446 447 448 449 450 451 452 453 454 455 456 457 458 459 460 461 462 463 464 465 466 467 468 469 470 471 472 473 474 475 476 477 478 479 480 481 482 483 484 485 486 487 488 489 490 491 492 493 494 495 496 497 498 499 500 501 502 |
/*
* AV1 helper functions for muxers
* Copyright (c) 2018 James Almer <[email protected]>
*
* This file is part of FFmpeg.
*
* FFmpeg is free software; you can redistribute it and/or
* modify it under the terms of the GNU Lesser General Public
* License as published by the Free Software Foundation; either
* version 2.1 of the License, or (at your option) any later version.
*
* FFmpeg is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
* Lesser General Public License for more details.
*
* You should have received a copy of the GNU Lesser General Public
* License along with FFmpeg; if not, write to the Free Software
* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
*/
#include "libavutil/avassert.h"
#include "libavutil/mem.h"
#include "libavcodec/av1.h"
#include "libavcodec/av1_parse.h"
#include "libavcodec/defs.h"
#include "libavcodec/put_bits.h"
#include "av1.h"
#include "avio.h"
#include "avio_internal.h"
static int av1_filter_obus(AVIOContext *pb, const uint8_t *buf,
int size, int *offset)
{
const uint8_t *start = buf, *end = buf + size;
int off;
enum {
START_NOT_FOUND,
START_FOUND,
END_FOUND,
OFFSET_IMPOSSIBLE,
} state = START_NOT_FOUND;
off = size = 0;
while (buf < end) {
int64_t obu_size;
int start_pos, type, temporal_id, spatial_id;
int len = parse_obu_header(buf, end - buf, &obu_size, &start_pos,
&type, &temporal_id, &spatial_id);
if (len < 0)
return len;
switch (type) {
case AV1_OBU_TEMPORAL_DELIMITER:
case AV1_OBU_REDUNDANT_FRAME_HEADER:
case AV1_OBU_TILE_LIST:
case AV1_OBU_PADDING:
if (state == START_FOUND)
state = END_FOUND;
break;
default:
if (state == START_NOT_FOUND) {
off = buf - start;
state = START_FOUND;
} else if (state == END_FOUND) {
state = OFFSET_IMPOSSIBLE;
}
if (pb)
avio_write(pb, buf, len);
size += len;
break;
}
buf += len;
}
if (offset)
*offset = state != OFFSET_IMPOSSIBLE ? off : -1;
return size;
}
int ff_av1_filter_obus(AVIOContext *pb, const uint8_t *buf, int size)
{
return av1_filter_obus(pb, buf, size, NULL);
}
int ff_av1_filter_obus_buf(const uint8_t *in, uint8_t **out,
int *size, int *offset)
{
FFIOContext pb;
uint8_t *buf;
int len, off, ret;
len = ret = av1_filter_obus(NULL, in, *size, &off);
if (ret < 0) {
return ret;
}
if (off >= 0) {
*out = (uint8_t *)in;
*size = len;
*offset = off;
return 0;
}
buf = av_malloc(len + AV_INPUT_BUFFER_PADDING_SIZE);
if (!buf)
return AVERROR(ENOMEM);
ffio_init_write_context(&pb, buf, len);
ret = av1_filter_obus(&pb.pub, in, *size, NULL);
av_assert1(ret == len);
memset(buf + len, 0, AV_INPUT_BUFFER_PADDING_SIZE);
*out = buf;
*size = len;
*offset = 0;
return 0;
}
static inline void uvlc(GetBitContext *gb)
{
int leading_zeros = 0;
while (get_bits_left(gb)) {
if (get_bits1(gb))
break;
leading_zeros++;
}
if (leading_zeros >= 32)
return;
skip_bits_long(gb, leading_zeros);
}
static int parse_color_config(AV1SequenceParameters *seq_params, GetBitContext *gb)
{
int twelve_bit = 0;
int high_bitdepth = get_bits1(gb);
if (seq_params->profile == AV_PROFILE_AV1_PROFESSIONAL && high_bitdepth)
twelve_bit = get_bits1(gb);
seq_params->bitdepth = 8 + (high_bitdepth * 2) + (twelve_bit * 2);
if (seq_params->profile == AV_PROFILE_AV1_HIGH)
seq_params->monochrome = 0;
else
seq_params->monochrome = get_bits1(gb);
seq_params->color_description_present_flag = get_bits1(gb);
if (seq_params->color_description_present_flag) {
seq_params->color_primaries = get_bits(gb, 8);
seq_params->transfer_characteristics = get_bits(gb, 8);
seq_params->matrix_coefficients = get_bits(gb, 8);
} else {
seq_params->color_primaries = AVCOL_PRI_UNSPECIFIED;
seq_params->transfer_characteristics = AVCOL_TRC_UNSPECIFIED;
seq_params->matrix_coefficients = AVCOL_SPC_UNSPECIFIED;
}
if (seq_params->monochrome) {
seq_params->color_range = get_bits1(gb);
seq_params->chroma_subsampling_x = 1;
seq_params->chroma_subsampling_y = 1;
seq_params->chroma_sample_position = 0;
return 0;
} else if (seq_params->color_primaries == AVCOL_PRI_BT709 &&
seq_params->transfer_characteristics == AVCOL_TRC_IEC61966_2_1 &&
seq_params->matrix_coefficients == AVCOL_SPC_RGB) {
seq_params->chroma_subsampling_x = 0;
seq_params->chroma_subsampling_y = 0;
} else {
seq_params->color_range = get_bits1(gb);
if (seq_params->profile == AV_PROFILE_AV1_MAIN) {
seq_params->chroma_subsampling_x = 1;
seq_params->chroma_subsampling_y = 1;
} else if (seq_params->profile == AV_PROFILE_AV1_HIGH) {
seq_params->chroma_subsampling_x = 0;
seq_params->chroma_subsampling_y = 0;
} else {
if (twelve_bit) {
seq_params->chroma_subsampling_x = get_bits1(gb);
if (seq_params->chroma_subsampling_x)
seq_params->chroma_subsampling_y = get_bits1(gb);
else
seq_params->chroma_subsampling_y = 0;
} else {
seq_params->chroma_subsampling_x = 1;
seq_params->chroma_subsampling_y = 0;
}
}
if (seq_params->chroma_subsampling_x && seq_params->chroma_subsampling_y)
seq_params->chroma_sample_position = get_bits(gb, 2);
}
skip_bits1(gb); // separate_uv_delta_q
return 0;
}
static int parse_sequence_header(AV1SequenceParameters *seq_params, const uint8_t *buf, int size)
{
GetBitContext gb;
int reduced_still_picture_header;
int frame_width_bits_minus_1, frame_height_bits_minus_1;
int size_bits, ret;
size_bits = get_obu_bit_length(buf, size, AV1_OBU_SEQUENCE_HEADER);
if (size_bits < 0)
return size_bits;
ret = init_get_bits(&gb, buf, size_bits);
if (ret < 0)
return ret;
memset(seq_params, 0, sizeof(*seq_params));
seq_params->profile = get_bits(&gb, 3);
skip_bits1(&gb); // still_picture
reduced_still_picture_header = get_bits1(&gb);
if (reduced_still_picture_header) {
seq_params->level = get_bits(&gb, 5);
seq_params->tier = 0;
} else {
int initial_display_delay_present_flag, operating_points_cnt_minus_1;
int decoder_model_info_present_flag, buffer_delay_length_minus_1;
if (get_bits1(&gb)) { // timing_info_present_flag
skip_bits_long(&gb, 32); // num_units_in_display_tick
skip_bits_long(&gb, 32); // time_scale
if (get_bits1(&gb)) // equal_picture_interval
uvlc(&gb); // num_ticks_per_picture_minus_1
decoder_model_info_present_flag = get_bits1(&gb);
if (decoder_model_info_present_flag) {
buffer_delay_length_minus_1 = get_bits(&gb, 5);
skip_bits_long(&gb, 32); // num_units_in_decoding_tick
skip_bits(&gb, 10); // buffer_removal_time_length_minus_1 (5)
// frame_presentation_time_length_minus_1 (5)
}
} else
decoder_model_info_present_flag = 0;
initial_display_delay_present_flag = get_bits1(&gb);
operating_points_cnt_minus_1 = get_bits(&gb, 5);
for (int i = 0; i <= operating_points_cnt_minus_1; i++) {
int seq_level_idx, seq_tier;
skip_bits(&gb, 12); // operating_point_idc
seq_level_idx = get_bits(&gb, 5);
if (seq_level_idx > 7)
seq_tier = get_bits1(&gb);
else
seq_tier = 0;
if (decoder_model_info_present_flag) {
if (get_bits1(&gb)) { // decoder_model_present_for_this_op
skip_bits_long(&gb, buffer_delay_length_minus_1 + 1); // decoder_buffer_delay
skip_bits_long(&gb, buffer_delay_length_minus_1 + 1); // encoder_buffer_delay
skip_bits1(&gb); // low_delay_mode_flag
}
}
if (initial_display_delay_present_flag) {
if (get_bits1(&gb)) // initial_display_delay_present_for_this_op
skip_bits(&gb, 4); // initial_display_delay_minus_1
}
if (i == 0) {
seq_params->level = seq_level_idx;
seq_params->tier = seq_tier;
}
}
}
frame_width_bits_minus_1 = get_bits(&gb, 4);
frame_height_bits_minus_1 = get_bits(&gb, 4);
skip_bits(&gb, frame_width_bits_minus_1 + 1); // max_frame_width_minus_1
skip_bits(&gb, frame_height_bits_minus_1 + 1); // max_frame_height_minus_1
if (!reduced_still_picture_header) {
if (get_bits1(&gb)) // frame_id_numbers_present_flag
skip_bits(&gb, 7); // delta_frame_id_length_minus_2 (4), additional_frame_id_length_minus_1 (3)
}
skip_bits(&gb, 3); // use_128x128_superblock (1), enable_filter_intra (1), enable_intra_edge_filter (1)
if (!reduced_still_picture_header) {
int enable_order_hint, seq_force_screen_content_tools;
skip_bits(&gb, 4); // enable_interintra_compound (1), enable_masked_compound (1)
// enable_warped_motion (1), enable_dual_filter (1)
enable_order_hint = get_bits1(&gb);
if (enable_order_hint)
skip_bits(&gb, 2); // enable_jnt_comp (1), enable_ref_frame_mvs (1)
if (get_bits1(&gb)) // seq_choose_screen_content_tools
seq_force_screen_content_tools = 2;
else
seq_force_screen_content_tools = get_bits1(&gb);
if (seq_force_screen_content_tools) {
if (!get_bits1(&gb)) // seq_choose_integer_mv
skip_bits1(&gb); // seq_force_integer_mv
}
if (enable_order_hint)
skip_bits(&gb, 3); // order_hint_bits_minus_1
}
skip_bits(&gb, 3); // enable_superres (1), enable_cdef (1), enable_restoration (1)
parse_color_config(seq_params, &gb);
skip_bits1(&gb); // film_grain_params_present
if (get_bits_left(&gb))
return AVERROR_INVALIDDATA;
return 0;
}
int ff_av1_parse_seq_header(AV1SequenceParameters *seq, const uint8_t *buf, int size)
{
int is_av1c;
if (size <= 0)
return AVERROR_INVALIDDATA;
is_av1c = !!(buf[0] & 0x80);
if (is_av1c) {
GetBitContext gb;
int ret, version = buf[0] & 0x7F;
if (version != 1 || size < 4)
return AVERROR_INVALIDDATA;
ret = init_get_bits8(&gb, buf, 4);
if (ret < 0)
return ret;
memset(seq, 0, sizeof(*seq));
skip_bits(&gb, 8);
seq->profile = get_bits(&gb, 3);
seq->level = get_bits(&gb, 5);
seq->tier = get_bits(&gb, 1);
seq->bitdepth = get_bits(&gb, 1) * 2 + 8;
seq->bitdepth += get_bits(&gb, 1) * 2;
seq->monochrome = get_bits(&gb, 1);
seq->chroma_subsampling_x = get_bits(&gb, 1);
seq->chroma_subsampling_y = get_bits(&gb, 1);
seq->chroma_sample_position = get_bits(&gb, 2);
seq->color_primaries = AVCOL_PRI_UNSPECIFIED;
seq->transfer_characteristics = AVCOL_TRC_UNSPECIFIED;
seq->matrix_coefficients = AVCOL_SPC_UNSPECIFIED;
size -= 4;
buf += 4;
}
while (size > 0) {
int64_t obu_size;
int start_pos, type, temporal_id, spatial_id;
int len = parse_obu_header(buf, size, &obu_size, &start_pos,
&type, &temporal_id, &spatial_id);
if (len < 0)
return len;
switch (type) {
case AV1_OBU_SEQUENCE_HEADER:
if (!obu_size)
return AVERROR_INVALIDDATA;
return parse_sequence_header(seq, buf + start_pos, obu_size);
default:
break;
}
size -= len;
buf += len;
}
return is_av1c ? 0 : AVERROR_INVALIDDATA;
}
int ff_isom_write_av1c(AVIOContext *pb, const uint8_t *buf, int size,
int write_seq_header)
{
AVIOContext *meta_pb;
AV1SequenceParameters seq_params;
PutBitContext pbc;
uint8_t header[4], *meta;
const uint8_t *seq;
int ret, nb_seq = 0, seq_size, meta_size;
if (size <= 0)
return AVERROR_INVALIDDATA;
if (buf[0] & 0x80) {
// first bit is nonzero, the passed data does not consist purely of
// OBUs. Expect that the data is already in AV1CodecConfigurationRecord
// format.
int config_record_version = buf[0] & 0x7f;
if (config_record_version != 1 || size < 4) {
return AVERROR_INVALIDDATA;
}
avio_write(pb, buf, size);
return 0;
}
ret = avio_open_dyn_buf(&meta_pb);
if (ret < 0)
return ret;
while (size > 0) {
int64_t obu_size;
int start_pos, type, temporal_id, spatial_id;
int len = parse_obu_header(buf, size, &obu_size, &start_pos,
&type, &temporal_id, &spatial_id);
if (len < 0) {
ret = len;
goto fail;
}
switch (type) {
case AV1_OBU_SEQUENCE_HEADER:
nb_seq++;
if (!obu_size || nb_seq > 1) {
ret = AVERROR_INVALIDDATA;
goto fail;
}
ret = parse_sequence_header(&seq_params, buf + start_pos, obu_size);
if (ret < 0)
goto fail;
seq = buf;
seq_size = len;
break;
case AV1_OBU_METADATA:
if (!obu_size) {
ret = AVERROR_INVALIDDATA;
goto fail;
}
avio_write(meta_pb, buf, len);
break;
default:
break;
}
size -= len;
buf += len;
}
if (!nb_seq) {
ret = AVERROR_INVALIDDATA;
goto fail;
}
init_put_bits(&pbc, header, sizeof(header));
put_bits(&pbc, 1, 1); // marker
put_bits(&pbc, 7, 1); // version
put_bits(&pbc, 3, seq_params.profile);
put_bits(&pbc, 5, seq_params.level);
put_bits(&pbc, 1, seq_params.tier);
put_bits(&pbc, 1, seq_params.bitdepth > 8);
put_bits(&pbc, 1, seq_params.bitdepth == 12);
put_bits(&pbc, 1, seq_params.monochrome);
put_bits(&pbc, 1, seq_params.chroma_subsampling_x);
put_bits(&pbc, 1, seq_params.chroma_subsampling_y);
put_bits(&pbc, 2, seq_params.chroma_sample_position);
put_bits(&pbc, 8, 0); // padding
flush_put_bits(&pbc);
avio_write(pb, header, sizeof(header));
if (write_seq_header) {
avio_write(pb, seq, seq_size);
}
meta_size = avio_get_dyn_buf(meta_pb, &meta);
if (meta_size)
avio_write(pb, meta, meta_size);
fail:
ffio_free_dyn_buf(&meta_pb);
return ret;
}
|