088122e748
* Combined Workspace for Encoder and Decoder * Addressed review comments and some minor edits --------- Co-authored-by: Divya B M <100655@ittiam.com>
126 lines
4 KiB
C
126 lines
4 KiB
C
/******************************************************************************
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* *
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* Copyright (C) 2023 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 <string.h>
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#include "ixheaac_type_def.h"
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#include "ixheaac_constants.h"
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#include "ixheaace_aac_constants.h"
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#include "ixheaac_basic_ops32.h"
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#include "ixheaac_basic_ops16.h"
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#include "ixheaac_basic_ops40.h"
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#include "ixheaace_bitbuffer.h"
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#include "ixheaace_sbr_def.h"
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#include "ixheaace_sbr_cmondata.h"
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#include "ixheaace_sbr_crc.h"
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#include "ixheaace_common_utils.h"
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static VOID ixheaace_crc_advance(UWORD16 crc_poly, UWORD16 crc_mask, UWORD16 *ptr_crc,
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UWORD32 b_value, WORD32 b_bits) {
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WORD32 i = b_bits - 1;
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while (i >= 0) {
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UWORD16 flag = (*ptr_crc) & crc_mask ? 1 : 0;
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flag ^= (b_value & (1 << i) ? 1 : 0);
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(*ptr_crc) <<= 1;
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if (flag) {
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(*ptr_crc) ^= crc_poly;
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}
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i--;
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}
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}
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VOID ixheaace_init_sbr_bitstream(ixheaace_pstr_common_data pstr_cmon_data,
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UWORD8 *ptr_memory_base, WORD32 memory_size, WORD32 crc_active,
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ixheaace_sbr_codec_type sbr_codec) {
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ixheaace_reset_bitbuf(&pstr_cmon_data->str_sbr_bit_buf, ptr_memory_base, memory_size);
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pstr_cmon_data->str_tmp_write_bit_buf = pstr_cmon_data->str_sbr_bit_buf;
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if (HEAAC_SBR == sbr_codec) {
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ixheaace_write_bits(&pstr_cmon_data->str_sbr_bit_buf, 0, SI_FILL_EXTENTION_BITS);
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if (crc_active) {
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ixheaace_write_bits(&pstr_cmon_data->str_sbr_bit_buf, 0, SI_CRC_BITS_SBR);
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}
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}
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}
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VOID ixheaace_assemble_sbr_bitstream(ixheaace_pstr_common_data pstr_cmon_data,
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ixheaace_sbr_codec_type sbr_codec) {
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UWORD16 crc_reg = CRCINIT_SBR;
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WORD32 num_crc_bits, i;
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WORD32 sbr_load = 0;
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sbr_load = pstr_cmon_data->sbr_hdr_bits + pstr_cmon_data->sbr_data_bits;
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if (HEAAC_SBR == sbr_codec) {
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sbr_load += SI_FILL_EXTENTION_BITS;
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}
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if (pstr_cmon_data->sbr_crc_len) {
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sbr_load += SI_CRC_BITS_SBR;
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}
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if (USAC_SBR != sbr_codec) {
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pstr_cmon_data->sbr_fill_bits = (8 - (sbr_load) % 8) % 8;
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ixheaace_write_bits(&pstr_cmon_data->str_sbr_bit_buf, 0,
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(UWORD8)pstr_cmon_data->sbr_fill_bits);
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}
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if (pstr_cmon_data->sbr_crc_len) {
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ixheaace_bit_buf tmp_crc_buf = pstr_cmon_data->str_sbr_bit_buf;
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ixheaace_readbits(&tmp_crc_buf, SI_FILL_EXTENTION_BITS);
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ixheaace_readbits(&tmp_crc_buf, SI_CRC_BITS_SBR);
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num_crc_bits = pstr_cmon_data->sbr_hdr_bits + pstr_cmon_data->sbr_data_bits +
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pstr_cmon_data->sbr_fill_bits;
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i = 0;
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while (i < num_crc_bits) {
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UWORD32 bit;
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bit = ixheaace_readbits(&tmp_crc_buf, 1);
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ixheaace_crc_advance(CRC_POLYNOMIAL_SBR, CRC_MASK_SBR, &crc_reg, bit, 1);
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i++;
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}
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crc_reg &= (CRC_RANGE_SBR);
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}
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if (pstr_cmon_data->sbr_crc_len) {
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ixheaace_write_bits(&pstr_cmon_data->str_tmp_write_bit_buf, SI_FIL_CRC_SBR,
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SI_FILL_EXTENTION_BITS);
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ixheaace_write_bits(&pstr_cmon_data->str_tmp_write_bit_buf, crc_reg, SI_CRC_BITS_SBR);
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} else {
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if (HEAAC_SBR == sbr_codec) {
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ixheaace_write_bits(&pstr_cmon_data->str_tmp_write_bit_buf, SI_FIL_SBR,
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SI_FILL_EXTENTION_BITS);
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}
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}
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}
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