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/******************************************************************************
* *
* Copyright (C) 2023 The Android Open Source Project
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at:
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*
*****************************************************************************
* Originally developed and contributed by Ittiam Systems Pvt. Ltd, Bangalore
*/
#include "ixheaac_type_def.h"
#include "ixheaac_constants.h"
#include "ixheaace_aac_constants.h"
#include <stdlib.h>
#include "ixheaac_basic_ops32.h"
#include "ixheaac_basic_ops16.h"
#include "ixheaac_basic_ops40.h"
#include "ixheaac_basic_ops.h"
#include "ixheaace_bitbuffer.h"
#include "ixheaace_common_utils.h"
UWORD8
ixheaace_write_bits(ixheaace_bit_buf_handle pstr_bit_buf, UWORD32 write_value,
UWORD8 num_bits_to_write) {
WORD8 bits_to_write;
WORD32 write_position;
UWORD8 *ptr_write_next;
UWORD8 *ptr_bit_buf_end;
UWORD8 *ptr_bit_buf_base;
UWORD8 bits_written = num_bits_to_write;
if (pstr_bit_buf == NULL) {
return num_bits_to_write;
}
pstr_bit_buf->cnt_bits += num_bits_to_write;
write_position = pstr_bit_buf->write_position;
ptr_write_next = pstr_bit_buf->ptr_write_next;
ptr_bit_buf_end = pstr_bit_buf->ptr_bit_buf_end;
ptr_bit_buf_base = pstr_bit_buf->ptr_bit_buf_base;
while (num_bits_to_write) {
UWORD8 tmp, msk;
bits_to_write = (WORD8)MIN(write_position + 1, num_bits_to_write);
tmp = (UWORD8)(write_value << (32 - num_bits_to_write) >>
(32 - bits_to_write) << (write_position + 1 - bits_to_write));
msk = ~(((1 << bits_to_write) - 1) << (write_position + 1 - bits_to_write));
*ptr_write_next &= msk;
*ptr_write_next |= tmp;
write_position -= bits_to_write;
num_bits_to_write -= bits_to_write;
if (write_position < 0) {
write_position += 8;
ptr_write_next++;
if (ptr_write_next > ptr_bit_buf_end) {
ptr_write_next = ptr_bit_buf_base;
}
}
}
pstr_bit_buf->write_position = write_position;
pstr_bit_buf->ptr_write_next = ptr_write_next;
return bits_written;
}
UWORD32 ixheaace_byte_align_buffer(ixheaace_bit_buf_handle pstr_it_bit_buff) {
WORD alignment;
alignment = (WORD)((pstr_it_bit_buff->cnt_bits) & 0x07);
if (alignment) {
ixheaace_write_bits(pstr_it_bit_buff, 0, (UWORD8)(8 - alignment));
return (8 - alignment);
}
return 0;
}
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