Harish Mahendrakar | 0d8951c | 2014-05-16 10:31:13 -0700 | [diff] [blame] | 1 | /****************************************************************************** |
| 2 | * |
| 3 | * Copyright (C) 2012 Ittiam Systems Pvt Ltd, Bangalore |
| 4 | * |
| 5 | * Licensed under the Apache License, Version 2.0 (the "License"); |
| 6 | * you may not use this file except in compliance with the License. |
| 7 | * You may obtain a copy of the License at: |
| 8 | * |
| 9 | * http://www.apache.org/licenses/LICENSE-2.0 |
| 10 | * |
| 11 | * Unless required by applicable law or agreed to in writing, software |
| 12 | * distributed under the License is distributed on an "AS IS" BASIS, |
| 13 | * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. |
| 14 | * See the License for the specific language governing permissions and |
| 15 | * limitations under the License. |
| 16 | * |
| 17 | ******************************************************************************/ |
| 18 | /** |
| 19 | ******************************************************************************* |
| 20 | * @file |
| 21 | * ihevcd_nal.c |
| 22 | * |
| 23 | * @brief |
| 24 | * Contains functions for NAL level such as search start code etc |
| 25 | * |
| 26 | * @author |
| 27 | * Harish |
| 28 | * |
| 29 | * @par List of Functions: |
| 30 | * |
| 31 | * @remarks |
| 32 | * None |
| 33 | * |
| 34 | ******************************************************************************* |
| 35 | */ |
| 36 | /*****************************************************************************/ |
| 37 | /* File Includes */ |
| 38 | /*****************************************************************************/ |
| 39 | #include <stdio.h> |
| 40 | #include <stddef.h> |
| 41 | #include <stdlib.h> |
| 42 | #include <string.h> |
| 43 | #include <assert.h> |
| 44 | |
| 45 | #include "ihevc_typedefs.h" |
| 46 | #include "iv.h" |
| 47 | #include "ivd.h" |
| 48 | #include "ihevcd_cxa.h" |
| 49 | |
| 50 | #include "ihevc_defs.h" |
| 51 | #include "ihevc_debug.h" |
| 52 | #include "ihevc_structs.h" |
| 53 | #include "ihevc_macros.h" |
| 54 | #include "ihevc_platform_macros.h" |
| 55 | #include "ihevc_cabac_tables.h" |
| 56 | |
| 57 | |
| 58 | #include "ihevcd_defs.h" |
| 59 | #include "ihevcd_function_selector.h" |
| 60 | #include "ihevcd_structs.h" |
| 61 | #include "ihevcd_error.h" |
| 62 | #include "ihevcd_nal.h" |
| 63 | #include "ihevcd_bitstream.h" |
| 64 | #include "ihevcd_parse_headers.h" |
| 65 | #include "ihevcd_parse_slice.h" |
| 66 | #include "ihevcd_debug.h" |
| 67 | /*****************************************************************************/ |
| 68 | /* Function Prototypes */ |
| 69 | /*****************************************************************************/ |
| 70 | |
| 71 | /** |
| 72 | ******************************************************************************* |
| 73 | * |
| 74 | * @brief |
| 75 | * Search start code from the given buffer pointer |
| 76 | * |
| 77 | * @par Description: |
| 78 | * Search for start code Return the offset of start code if start code is |
| 79 | * found If no start code is found till end of given bitstream then treat |
| 80 | * it as invalid NAL and return end of buffer as offset |
| 81 | * |
| 82 | * @param[in] pu1_buf |
| 83 | * Pointer to bitstream |
| 84 | * |
| 85 | * @param[in] bytes_remaining |
| 86 | * Number of bytes remaining in the buffer |
| 87 | * |
| 88 | * @returns Offset to the first byte in NAL after start code |
| 89 | * |
| 90 | * @remarks |
| 91 | * Incomplete start code at the end of input bitstream is not handled. This |
| 92 | * has to be taken care outside this func |
| 93 | * |
| 94 | ******************************************************************************* |
| 95 | */ |
| 96 | WORD32 ihevcd_nal_search_start_code(UWORD8 *pu1_buf, WORD32 bytes_remaining) |
| 97 | { |
| 98 | WORD32 ofst; |
| 99 | |
| 100 | WORD32 zero_byte_cnt; |
| 101 | WORD32 start_code_found; |
| 102 | |
| 103 | ofst = -1; |
| 104 | |
| 105 | zero_byte_cnt = 0; |
| 106 | start_code_found = 0; |
| 107 | while(ofst < (bytes_remaining - 1)) |
| 108 | { |
| 109 | ofst++; |
| 110 | if(pu1_buf[ofst] != 0) |
| 111 | { |
| 112 | zero_byte_cnt = 0; |
| 113 | continue; |
| 114 | } |
| 115 | |
| 116 | zero_byte_cnt++; |
Naveen Kumar P | 4b20018 | 2017-05-25 15:30:59 +0530 | [diff] [blame] | 117 | if((ofst < (bytes_remaining - 1)) && |
| 118 | (pu1_buf[ofst + 1] == START_CODE_PREFIX_BYTE) && |
Harish Mahendrakar | 0d8951c | 2014-05-16 10:31:13 -0700 | [diff] [blame] | 119 | (zero_byte_cnt >= NUM_ZEROS_BEFORE_START_CODE)) |
| 120 | { |
| 121 | /* Found the start code */ |
| 122 | ofst++; |
| 123 | start_code_found = 1; |
| 124 | break; |
| 125 | } |
| 126 | } |
Naveen Kumar P | 4b20018 | 2017-05-25 15:30:59 +0530 | [diff] [blame] | 127 | if((0 == start_code_found) && (ofst < bytes_remaining)) |
Harish Mahendrakar | 0d8951c | 2014-05-16 10:31:13 -0700 | [diff] [blame] | 128 | { |
| 129 | if((START_CODE_PREFIX_BYTE == pu1_buf[ofst]) && |
| 130 | (zero_byte_cnt >= NUM_ZEROS_BEFORE_START_CODE)) |
| 131 | { |
| 132 | /* Found a start code at the end*/ |
| 133 | ofst++; |
| 134 | } |
| 135 | } |
| 136 | /* Since ofst started at -1, increment it by 1 */ |
| 137 | ofst++; |
| 138 | |
| 139 | return ofst; |
| 140 | } |
| 141 | |
| 142 | /** |
| 143 | ******************************************************************************* |
| 144 | * |
| 145 | * @brief |
| 146 | * Remove emulation prevention byte present in the bitstream till next start |
| 147 | * code is found. Emulation prevention byte removed data is stored in a |
| 148 | * different buffer |
| 149 | * |
| 150 | * @par Description: |
| 151 | * Assumption is first start code is already found and pu1_buf is pointing |
| 152 | * to a byte after the start code Search for Next NAL's start code Return |
| 153 | * if start code is found Remove any emulation prevention byte present Copy |
| 154 | * data to new buffer If no start code is found, then treat complete buffer |
| 155 | * as one nal. |
| 156 | * |
| 157 | * @param[in] pu1_src |
| 158 | * Pointer to bitstream (excludes the initial the start code) |
| 159 | * |
| 160 | * @param[in] pu1_dst |
| 161 | * Pointer to destination buffer |
| 162 | * |
| 163 | * @param[in] bytes_remaining |
| 164 | * Number of bytes remaining |
| 165 | * |
| 166 | * @param[out] pi4_nal_len |
| 167 | * NAL length (length of bitstream parsed) |
| 168 | * |
| 169 | * @param[out] pi4_dst_len |
| 170 | * Destination bitstream size (length of bitstream parsed with emulation bytes |
| 171 | * removed) |
| 172 | * |
| 173 | * @returns Error code from IHEVCD_ERROR_T |
| 174 | * |
| 175 | * @remarks |
| 176 | * Incomplete start code at the end of input bitstream is not handled. This |
| 177 | * has to be taken care outside this func |
| 178 | * |
| 179 | ******************************************************************************* |
| 180 | */ |
| 181 | IHEVCD_ERROR_T ihevcd_nal_remv_emuln_bytes(UWORD8 *pu1_src, |
| 182 | UWORD8 *pu1_dst, |
| 183 | WORD32 bytes_remaining, |
| 184 | WORD32 *pi4_nal_len, |
| 185 | WORD32 *pi4_dst_len) |
| 186 | { |
| 187 | WORD32 src_cnt; |
| 188 | WORD32 dst_cnt; |
| 189 | WORD32 zero_byte_cnt; |
| 190 | WORD32 start_code_found; |
| 191 | UWORD8 u1_src; |
| 192 | IHEVCD_ERROR_T ret = (IHEVCD_ERROR_T)IHEVCD_SUCCESS; |
| 193 | |
| 194 | src_cnt = 0; |
| 195 | dst_cnt = 0; |
| 196 | zero_byte_cnt = 0; |
| 197 | start_code_found = 0; |
| 198 | while(src_cnt < (bytes_remaining - 1)) |
| 199 | { |
| 200 | u1_src = pu1_src[src_cnt++]; |
| 201 | |
| 202 | pu1_dst[dst_cnt++] = u1_src; |
| 203 | if(u1_src != 0) |
| 204 | { |
| 205 | zero_byte_cnt = 0; |
| 206 | continue; |
| 207 | } |
| 208 | |
| 209 | zero_byte_cnt++; |
| 210 | if(zero_byte_cnt >= NUM_ZEROS_BEFORE_START_CODE) |
| 211 | { |
| 212 | u1_src = pu1_src[src_cnt]; |
| 213 | if(START_CODE_PREFIX_BYTE == u1_src) |
| 214 | { |
| 215 | /* Found the start code */ |
| 216 | src_cnt -= zero_byte_cnt; |
| 217 | dst_cnt -= zero_byte_cnt; |
| 218 | start_code_found = 1; |
| 219 | break; |
| 220 | } |
| 221 | else if(EMULATION_PREVENT_BYTE == u1_src) |
| 222 | { |
| 223 | /* Found the emulation prevention byte */ |
| 224 | src_cnt++; |
| 225 | zero_byte_cnt = 0; |
| 226 | |
| 227 | /* Decrement dst_cnt so that the next byte overwrites |
| 228 | * the emulation prevention byte already copied to dst above |
| 229 | */ |
| 230 | } |
| 231 | } |
| 232 | |
| 233 | } |
| 234 | |
Naveen Kumar P | 4b20018 | 2017-05-25 15:30:59 +0530 | [diff] [blame] | 235 | if((0 == start_code_found) && (src_cnt < bytes_remaining)) |
Harish Mahendrakar | 0d8951c | 2014-05-16 10:31:13 -0700 | [diff] [blame] | 236 | { |
| 237 | u1_src = pu1_src[src_cnt++]; |
| 238 | if(zero_byte_cnt >= NUM_ZEROS_BEFORE_START_CODE) |
| 239 | { |
| 240 | |
| 241 | if(START_CODE_PREFIX_BYTE == u1_src) |
| 242 | { |
| 243 | /* Found a start code at the end*/ |
| 244 | src_cnt -= zero_byte_cnt; |
| 245 | } |
| 246 | else if(EMULATION_PREVENT_BYTE == u1_src) |
| 247 | { |
| 248 | /* Found the emulation prevention byte at the end*/ |
| 249 | src_cnt++; |
| 250 | /* Decrement dst_cnt so that the next byte overwrites |
| 251 | * the emulation prevention byte already copied to dst above |
| 252 | */ |
| 253 | dst_cnt--; |
| 254 | } |
| 255 | } |
| 256 | else |
| 257 | { |
| 258 | pu1_dst[dst_cnt++] = u1_src; |
| 259 | } |
| 260 | |
| 261 | |
| 262 | } |
| 263 | *pi4_nal_len = src_cnt; |
| 264 | *pi4_dst_len = dst_cnt; |
| 265 | return ret; |
| 266 | } |
| 267 | /** |
| 268 | ******************************************************************************* |
| 269 | * |
| 270 | * @brief |
| 271 | * Decode given NAL unit's header |
| 272 | * |
| 273 | * @par Description: |
| 274 | * Call NAL unit's header decode Section: 7.3.1.2 |
| 275 | * |
| 276 | * @param[in] ps_bitstrm |
| 277 | * Pointer to bitstream context |
| 278 | * |
| 279 | * @param[out] ps_nal |
| 280 | * Pointer to NAL header |
| 281 | * |
| 282 | * @returns Error code from IHEVCD_ERROR_T |
| 283 | * |
| 284 | * @remarks |
| 285 | * |
| 286 | * |
| 287 | ******************************************************************************* |
| 288 | */ |
| 289 | IHEVCD_ERROR_T ihevcd_nal_unit_header(bitstrm_t *ps_bitstrm, nal_header_t *ps_nal) |
| 290 | { |
| 291 | WORD32 unused; |
| 292 | IHEVCD_ERROR_T ret = (IHEVCD_ERROR_T)IHEVCD_SUCCESS; |
| 293 | UNUSED(unused); |
| 294 | /* Syntax : forbidden_zero_bit */ |
| 295 | unused = ihevcd_bits_get(ps_bitstrm, 1); |
| 296 | |
| 297 | /* Syntax : nal_unit_type */ |
| 298 | ps_nal->i1_nal_unit_type = ihevcd_bits_get(ps_bitstrm, 6); |
| 299 | |
| 300 | /* Syntax : nuh_reserved_zero_6bits */ |
| 301 | unused = ihevcd_bits_get(ps_bitstrm, 6); |
| 302 | |
| 303 | /* Syntax : nuh_temporal_id_plus1 */ |
| 304 | ps_nal->i1_nuh_temporal_id = ihevcd_bits_get(ps_bitstrm, 3) - 1; |
| 305 | |
| 306 | return ret; |
| 307 | |
| 308 | } |
| 309 | |
| 310 | /** |
| 311 | ******************************************************************************* |
| 312 | * |
| 313 | * @brief |
| 314 | * Decode given NAL |
| 315 | * |
| 316 | * @par Description: |
| 317 | * Based on the NAL type call appropriate decode function Section: 7.3.1.1 |
| 318 | * |
| 319 | * |
| 320 | * @param[in,out] ps_codec |
| 321 | * Pointer to codec context (Functions called within will modify contents of |
| 322 | * ps_codec) |
| 323 | * |
| 324 | * @returns Error code from IHEVCD_ERROR_T |
| 325 | * |
| 326 | * @remarks |
| 327 | * |
| 328 | * |
| 329 | ******************************************************************************* |
| 330 | */ |
| 331 | IHEVCD_ERROR_T ihevcd_nal_unit(codec_t *ps_codec) |
| 332 | { |
| 333 | IHEVCD_ERROR_T ret = (IHEVCD_ERROR_T)IHEVCD_SUCCESS; |
| 334 | |
| 335 | /* NAL Header */ |
| 336 | nal_header_t s_nal; |
| 337 | |
| 338 | ret = ihevcd_nal_unit_header(&ps_codec->s_parse.s_bitstrm, &s_nal); |
| 339 | RETURN_IF((ret != (IHEVCD_ERROR_T)IHEVCD_SUCCESS), ret); |
| 340 | |
| 341 | if(ps_codec->i4_slice_error) |
| 342 | s_nal.i1_nal_unit_type = ps_codec->s_parse.ps_slice_hdr->i1_nal_unit_type; |
| 343 | |
| 344 | /* Setting RASL Output flag */ |
| 345 | switch(s_nal.i1_nal_unit_type) |
| 346 | { |
| 347 | case NAL_BLA_W_LP : |
| 348 | case NAL_BLA_W_DLP : |
| 349 | case NAL_BLA_N_LP : |
| 350 | ps_codec->i4_rasl_output_flag = 0; |
| 351 | break; |
| 352 | |
| 353 | //TODO: After IDR, there is no case of open GOP |
| 354 | //To be fixed appropriately by ignoring RASL only if the |
| 355 | // required references are not found |
| 356 | case NAL_IDR_W_LP : |
| 357 | case NAL_IDR_N_LP : |
| 358 | ps_codec->i4_rasl_output_flag = 1; |
| 359 | break; |
| 360 | |
| 361 | case NAL_CRA : |
Naveen Kumar Ponnusamy | 221aacc | 2014-10-28 11:23:59 +0530 | [diff] [blame] | 362 | ps_codec->i4_rasl_output_flag = (0 != ps_codec->i4_cra_as_first_pic) ? 0 : 1; |
Harish Mahendrakar | 0d8951c | 2014-05-16 10:31:13 -0700 | [diff] [blame] | 363 | break; |
| 364 | |
| 365 | default: |
| 366 | break; |
| 367 | } |
| 368 | |
| 369 | switch(s_nal.i1_nal_unit_type) |
| 370 | { |
| 371 | case NAL_BLA_W_LP : |
| 372 | case NAL_BLA_W_DLP : |
| 373 | case NAL_BLA_N_LP : |
| 374 | case NAL_IDR_W_LP : |
| 375 | case NAL_IDR_N_LP : |
| 376 | case NAL_CRA : |
| 377 | case NAL_TRAIL_N : |
| 378 | case NAL_TRAIL_R : |
| 379 | case NAL_TSA_N : |
| 380 | case NAL_TSA_R : |
| 381 | case NAL_STSA_N : |
| 382 | case NAL_STSA_R : |
| 383 | case NAL_RADL_N : |
| 384 | case NAL_RADL_R : |
| 385 | case NAL_RASL_N : |
| 386 | case NAL_RASL_R : |
| 387 | if(ps_codec->i4_header_mode) |
| 388 | return IHEVCD_SLICE_IN_HEADER_MODE; |
| 389 | |
| 390 | if((0 == ps_codec->i4_sps_done) || |
| 391 | (0 == ps_codec->i4_pps_done)) |
| 392 | { |
| 393 | return IHEVCD_INVALID_HEADER; |
| 394 | } |
| 395 | |
| 396 | ps_codec->i4_header_in_slice_mode = 0; |
Naveen Kumar Ponnusamy | 221aacc | 2014-10-28 11:23:59 +0530 | [diff] [blame] | 397 | ps_codec->i4_cra_as_first_pic = 0; |
Harish Mahendrakar | 0d8951c | 2014-05-16 10:31:13 -0700 | [diff] [blame] | 398 | |
| 399 | ret = ihevcd_parse_slice_header(ps_codec, &s_nal); |
| 400 | DEBUG_PRINT_NAL_INFO(ps_codec, s_nal.i1_nal_unit_type); |
| 401 | if(ret == (IHEVCD_ERROR_T)IHEVCD_SUCCESS) |
| 402 | { |
| 403 | if((s_nal.i1_nal_unit_type != NAL_RASL_N && s_nal.i1_nal_unit_type != NAL_RASL_R) || |
| 404 | ps_codec->i4_rasl_output_flag || |
| 405 | ps_codec->i4_slice_error) |
| 406 | ret = ihevcd_parse_slice_data(ps_codec); |
| 407 | } |
| 408 | break; |
| 409 | |
| 410 | case NAL_VPS : |
| 411 | // ret = ihevcd_parse_vps(ps_codec); |
| 412 | DEBUG_PRINT_NAL_INFO(ps_codec, s_nal.i1_nal_unit_type); |
| 413 | break; |
| 414 | |
| 415 | case NAL_SPS : |
| 416 | if(0 == ps_codec->i4_header_mode) |
| 417 | { |
| 418 | ps_codec->i4_header_in_slice_mode = 1; |
| 419 | if(ps_codec->i4_sps_done && |
| 420 | ps_codec->i4_pic_present) |
| 421 | break; |
| 422 | } |
| 423 | |
| 424 | ret = ihevcd_parse_sps(ps_codec); |
| 425 | if(ret == (IHEVCD_ERROR_T)IHEVCD_SUCCESS) |
| 426 | { |
| 427 | sps_t *ps_sps = ps_codec->ps_sps_base + MAX_SPS_CNT - 1; |
| 428 | ihevcd_copy_sps(ps_codec, ps_sps->i1_sps_id, MAX_SPS_CNT - 1); |
| 429 | } |
Naveen Kumar Ponnusamy | 221aacc | 2014-10-28 11:23:59 +0530 | [diff] [blame] | 430 | ps_codec->i4_error_code = ret; |
Harish Mahendrakar | 0d8951c | 2014-05-16 10:31:13 -0700 | [diff] [blame] | 431 | |
| 432 | DEBUG_PRINT_NAL_INFO(ps_codec, s_nal.i1_nal_unit_type); |
| 433 | break; |
| 434 | |
| 435 | case NAL_PPS : |
| 436 | if(0 == ps_codec->i4_header_mode) |
| 437 | { |
| 438 | ps_codec->i4_header_in_slice_mode = 1; |
| 439 | if(ps_codec->i4_pps_done && |
| 440 | ps_codec->i4_pic_present) |
| 441 | break; |
| 442 | } |
| 443 | |
| 444 | ret = ihevcd_parse_pps(ps_codec); |
| 445 | if(ret == (IHEVCD_ERROR_T)IHEVCD_SUCCESS) |
| 446 | { |
| 447 | pps_t *ps_pps = ps_codec->ps_pps_base + MAX_PPS_CNT - 1; |
| 448 | ihevcd_copy_pps(ps_codec, ps_pps->i1_pps_id, MAX_PPS_CNT - 1); |
| 449 | } |
Naveen Kumar Ponnusamy | 221aacc | 2014-10-28 11:23:59 +0530 | [diff] [blame] | 450 | ps_codec->i4_error_code = ret; |
Harish Mahendrakar | 0d8951c | 2014-05-16 10:31:13 -0700 | [diff] [blame] | 451 | DEBUG_PRINT_NAL_INFO(ps_codec, s_nal.i1_nal_unit_type); |
| 452 | break; |
| 453 | |
Naveen Kumar Ponnusamy | 221aacc | 2014-10-28 11:23:59 +0530 | [diff] [blame] | 454 | case NAL_EOS : |
| 455 | ps_codec->i4_cra_as_first_pic = 1; |
| 456 | break; |
| 457 | |
Harish Mahendrakar | 0d8951c | 2014-05-16 10:31:13 -0700 | [diff] [blame] | 458 | default: |
| 459 | DEBUG_PRINT_NAL_INFO(ps_codec, s_nal.i1_nal_unit_type); |
| 460 | break; |
| 461 | } |
| 462 | |
| 463 | return ret; |
| 464 | } |
| 465 | |