/******************************************************************************
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* *
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* Copyright (C) 2018 The Android Open Source Project
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*
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* Licensed under the Apache License, Version 2.0 (the "License");
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* you may not use this file except in compliance with the License.
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* You may obtain a copy of the License at:
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS,
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* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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* See the License for the specific language governing permissions and
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* limitations under the License.
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*
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*****************************************************************************
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* Originally developed and contributed by Ittiam Systems Pvt. Ltd, Bangalore
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*/
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#include <ixheaacd_type_def.h>
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#include "ixheaacd_sbr_common.h"
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#include <ixheaacd_type_def.h>
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#include "ixheaacd_bitbuffer.h"
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#include "ixheaacd_defines.h"
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#include <ixheaacd_aac_rom.h>
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#include "ixheaacd_sbrdecsettings.h"
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#include "ixheaacd_env_extr_part.h"
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#include <ixheaacd_sbr_rom.h>
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#include "ixheaacd_common_rom.h"
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#include "ixheaacd_pulsedata.h"
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#include "ixheaacd_pns.h"
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#include "ixheaacd_drc_data_struct.h"
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#include "ixheaacd_lt_predict.h"
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#include "ixheaacd_channelinfo.h"
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#include "ixheaacd_drc_dec.h"
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#include "ixheaacd_sbrdecoder.h"
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#include "ixheaacd_channel.h"
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#include "ixheaacd_audioobjtypes.h"
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#include "ixheaacd_memory_standards.h"
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#include "ixheaacd_adts.h"
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#include "ixheaacd_audioobjtypes.h"
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#include "ixheaacd_latmdemux.h"
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#include "ixheaacd_aacdec.h"
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#include "ixheaacd_mps_polyphase.h"
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#include "ixheaacd_config.h"
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#include "ixheaacd_mps_dec.h"
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#include "ixheaacd_struct_def.h"
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#include "ixheaacd_error_codes.h"
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#include "ixheaacd_adts_crc_check.h"
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VOID ixheaacd_adts_crc_open(ia_adts_crc_info_struct *ptr_adts_crc_info) {
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WORD32 i, j;
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UWORD16 val;
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ptr_adts_crc_info->no_reg = 0;
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ptr_adts_crc_info->crc_active = 0;
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for (i = 0; i <= 255; ++i) {
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for (val = i << 8, j = 8; --j >= 0;) {
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val = (val & 0x8000) ? (val << 1) ^ 0x8005 : val << 1;
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}
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ptr_adts_crc_info->crc_lookup[i] = val;
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}
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}
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VOID ixheaacd_copy_bit_buf_state(
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ia_bit_buf_struct *it_bit_buff_src,
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ia_crc_bit_buf_struct_handle it_crc_bit_buff_dst) {
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it_crc_bit_buff_dst->ptr_bit_buf_base = it_bit_buff_src->ptr_bit_buf_base;
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it_crc_bit_buff_dst->ptr_bit_buf_end = it_bit_buff_src->ptr_bit_buf_end;
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it_crc_bit_buff_dst->ptr_read_next = it_bit_buff_src->ptr_read_next;
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it_crc_bit_buff_dst->bit_pos = it_bit_buff_src->bit_pos;
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it_crc_bit_buff_dst->cnt_bits = it_bit_buff_src->cnt_bits;
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it_crc_bit_buff_dst->size = it_bit_buff_src->size;
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}
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WORD32 ixheaacd_adts_crc_start_reg(ia_adts_crc_info_struct *ptr_adts_crc_info,
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ia_bit_buf_struct *it_bit_buff_src,
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WORD32 no_bits) {
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UWORD32 no_bytes;
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ptr_adts_crc_info->str_crc_reg_data[ptr_adts_crc_info->no_reg].bit_cnt = 0;
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ptr_adts_crc_info->str_crc_reg_data[ptr_adts_crc_info->no_reg].max_bits =
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no_bits;
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if (no_bits < 0) {
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no_bits = -no_bits;
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}
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if (no_bits == 0) {
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no_bits = 16 << 3;
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}
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no_bytes = no_bits >> 3;
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if (no_bytes << 3 < (UWORD32)no_bits) {
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no_bytes++;
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}
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ptr_adts_crc_info->str_crc_reg_data[ptr_adts_crc_info->no_reg].buf_size =
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no_bytes;
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ptr_adts_crc_info->str_crc_reg_data[ptr_adts_crc_info->no_reg].active = 1;
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ixheaacd_copy_bit_buf_state(
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it_bit_buff_src,
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&(ptr_adts_crc_info->str_crc_reg_data[ptr_adts_crc_info->no_reg]
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.str_bit_buf));
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ptr_adts_crc_info->no_reg += 1;
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return (ptr_adts_crc_info->no_reg - 1);
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}
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VOID ixheaacd_adts_crc_end_reg(ia_adts_crc_info_struct *ptr_adts_crc_info,
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ia_bit_buf_struct *it_bit_buff_src, WORD32 reg) {
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ptr_adts_crc_info->str_crc_reg_data[reg].active = 0;
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ptr_adts_crc_info->str_crc_reg_data[reg].bit_buf_cnt =
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ptr_adts_crc_info->str_crc_reg_data[reg].str_bit_buf.cnt_bits -
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it_bit_buff_src->cnt_bits;
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}
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VOID ixheaacd_adts_crc_fast_crc(ia_adts_crc_info_struct *ptr_adts_crc_info,
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UWORD16 *crc_reg, UWORD8 feed) {
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*crc_reg =
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(*crc_reg << 8) ^ ptr_adts_crc_info->crc_lookup[(*crc_reg >> 8) ^ feed];
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}
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VOID ixheaacd_adts_crc_slow_crc(UWORD16 *crc_reg, UWORD8 feed,
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UWORD32 no_bits) {
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UWORD32 i;
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UWORD16 tmp;
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for (i = 0; i < no_bits; i++) {
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tmp = (feed & (1 << (7 - i))) >> (7 - i);
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tmp ^= (*crc_reg & (1 << 15)) >> 15;
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tmp *= 32773;
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*crc_reg <<= 1;
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*crc_reg ^= tmp;
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}
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}
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WORD32 ixheaacd_adts_crc_check_crc(ia_adts_crc_info_struct *ptr_adts_crc_info) {
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WORD32 error_code = AAC_DEC_OK;
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UWORD16 crc = 65535;
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WORD32 reg;
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ia_crc_reg_data_struct *ptr_reg_data;
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for (reg = 0; reg < ptr_adts_crc_info->no_reg; reg++) {
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UWORD8 bits;
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UWORD32 bits_remaining;
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ptr_reg_data = &ptr_adts_crc_info->str_crc_reg_data[reg];
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if (ptr_reg_data->max_bits > 0) {
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if (ptr_adts_crc_info->str_crc_reg_data[reg].bit_buf_cnt >
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ptr_reg_data->max_bits)
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bits_remaining = ptr_reg_data->max_bits;
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else
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bits_remaining = ptr_adts_crc_info->str_crc_reg_data[reg].bit_buf_cnt;
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} else {
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bits_remaining = ptr_adts_crc_info->str_crc_reg_data[reg].bit_buf_cnt;
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}
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while (bits_remaining >= 8) {
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bits = (UWORD8)ixheaacd_read_bits_buf(
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(ia_bit_buf_struct *)(&ptr_adts_crc_info->str_crc_reg_data[reg]
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.str_bit_buf),
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8);
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ixheaacd_adts_crc_fast_crc(ptr_adts_crc_info, &crc, bits);
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bits_remaining -= 8;
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}
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bits = (UWORD8)ixheaacd_read_bits_buf(
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(ia_bit_buf_struct *)(&ptr_adts_crc_info->str_crc_reg_data[reg]
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.str_bit_buf),
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bits_remaining);
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ixheaacd_adts_crc_slow_crc(&crc, (UWORD8)(bits << (8 - bits_remaining)),
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bits_remaining);
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if (ptr_reg_data->max_bits >
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ptr_adts_crc_info->str_crc_reg_data[reg].bit_buf_cnt) {
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bits_remaining = ptr_reg_data->max_bits -
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ptr_adts_crc_info->str_crc_reg_data[reg].bit_buf_cnt;
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for (; bits_remaining >= 8; bits_remaining -= 8) {
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ixheaacd_adts_crc_fast_crc(ptr_adts_crc_info, &crc, 0);
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}
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ixheaacd_adts_crc_slow_crc(&crc, 0, bits_remaining);
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}
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}
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ptr_adts_crc_info->no_reg = 0;
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if (crc != ptr_adts_crc_info->file_value) {
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return (IA_ENHAACPLUS_DEC_EXE_NONFATAL_ADTS_HDR_CRC_FAIL);
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}
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return (error_code);
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}
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