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      1 /******************************************************************************
      2  *                                                                            *
      3  * Copyright (C) 2018 The Android Open Source Project
      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  * Originally developed and contributed by Ittiam Systems Pvt. Ltd, Bangalore
     19 */
     20 #ifndef IXHEAACD_BITBUFFER_H
     21 #define IXHEAACD_BITBUFFER_H
     22 
     23 #define CRC_ADTS_HEADER_LEN 56
     24 #define CRC_ADTS_RAW_DATA_BLK_LEN 192
     25 #define CRC_ADTS_RAW_IIND_ICS 128
     26 #define CRC_ADTS_LEN_ALL -1
     27 
     28 #define MAX_REG_SIZE 192
     29 #define MAX_CRC_REGS 7
     30 
     31 struct ia_crc_bit_buf_struct {
     32   UWORD8 *ptr_bit_buf_base;
     33   UWORD8 *ptr_bit_buf_end;
     34 
     35   UWORD8 *ptr_read_next;
     36   WORD16 bit_pos;
     37   WORD32 cnt_bits;
     38 
     39   WORD32 size;
     40 };
     41 
     42 typedef struct {
     43   UWORD8 active;
     44   WORD32 buf_size;
     45   WORD32 max_bits;
     46   UWORD32 bit_cnt;
     47   WORD32 bit_buf_cnt;
     48   struct ia_crc_bit_buf_struct str_bit_buf;
     49 } ia_crc_reg_data_struct;
     50 
     51 typedef struct {
     52   UWORD8 crc_active;
     53   UWORD16 no_reg;
     54   UWORD16 file_value;
     55   UWORD16 crc_lookup[256];
     56   ia_crc_reg_data_struct str_crc_reg_data[MAX_CRC_REGS];
     57 } ia_adts_crc_info_struct;
     58 
     59 typedef struct ia_bit_buf_struct {
     60   UWORD8 *ptr_bit_buf_base;
     61   UWORD8 *ptr_bit_buf_end;
     62 
     63   UWORD8 *ptr_read_next;
     64 
     65   WORD32 bit_pos;
     66   WORD32 cnt_bits;
     67 
     68   WORD32 size;
     69 
     70   WORD32 adts_header_present;
     71   WORD32 crc_check;
     72   WORD8 protection_absent;
     73   WORD8 no_raw_data_blocks;
     74   ia_adts_crc_info_struct str_adts_crc_info;
     75   ia_adts_crc_info_struct *pstr_adts_crc_info;
     76 
     77   WORD32 initial_cnt_bits;
     78   WORD32 audio_mux_align;
     79   WORD32 bit_count;
     80   WORD32 valid_bits;
     81   UWORD8 byte;
     82   UWORD8 *byte_ptr;
     83   UWORD8 *ptr_start;
     84   WORD32 write_bit_count;
     85   WORD32 max_size;
     86 
     87 } ia_bit_buf_struct;
     88 
     89 typedef struct ia_bit_buf_struct *ia_handle_bit_buf_struct;
     90 
     91 typedef struct ia_crc_bit_buf_struct *ia_crc_bit_buf_struct_handle;
     92 
     93 VOID ixheaacd_byte_align(ia_bit_buf_struct *it_bit_buff,
     94                          WORD32 *ptr_byte_align_bits);
     95 
     96 ia_bit_buf_struct *ixheaacd_create_bit_buf(ia_bit_buf_struct *it_bit_buff,
     97                                            UWORD8 *ptr_bit_buf_base,
     98                                            WORD32 bit_buf_size);
     99 
    100 ia_bit_buf_struct *ixheaacd_create_init_bit_buf(ia_bit_buf_struct *it_bit_buff,
    101                                                 UWORD8 *ptr_bit_buf_base,
    102                                                 WORD32 bit_buf_size);
    103 
    104 WORD32 ixheaacd_read_bits_buf(ia_bit_buf_struct *it_bit_buff, WORD no_of_bits);
    105 
    106 WORD32 ixheaacd_show_bits_buf(ia_bit_buf_struct *it_bit_buff, WORD no_of_bits);
    107 
    108 VOID ixheaacd_read_bidirection(ia_bit_buf_struct *it_bit_buff,
    109                                WORD32 ixheaacd_drc_offset);
    110 
    111 UWORD32 ixheaacd_aac_showbits_32(UWORD8 *ptr_read_next);
    112 
    113 UWORD32 ixheaacd_aac_read_byte(UWORD8 **ptr_read_next, WORD32 *bit_pos,
    114                                WORD32 *readword);
    115 
    116 UWORD32 ixheaacd_aac_read_2bytes(UWORD8 **ptr_read_next, WORD32 *bit_pos,
    117                                  WORD32 *readword);
    118 
    119 UWORD32 ixheaacd_aac_read_byte_corr(UWORD8 **ptr_read_next, WORD32 *ptr_bit_pos,
    120                                     WORD32 *readword, UWORD8 *p_bit_buf_end);
    121 
    122 UWORD32 ixheaacd_aac_read_byte_corr1(UWORD8 **ptr_read_next,
    123                                      WORD16 *ptr_bit_pos, WORD32 *readword);
    124 
    125 #define get_no_bits_available(it_bit_buff) ((it_bit_buff)->cnt_bits)
    126 #define ixheaacd_no_bits_read(it_bit_buff) \
    127   ((it_bit_buff)->size - (it_bit_buff)->cnt_bits)
    128 
    129 WORD32 ixheaacd_aac_read_bit_rev(ia_bit_buf_struct *it_bit_buff);
    130 WORD32 ixheaacd_aac_read_bit(ia_bit_buf_struct *it_bit_buff);
    131 
    132 VOID ixheaacd_write_bit(ia_bit_buf_struct *it_bit_buff, WORD32 value,
    133                         WORD32 no_of_bits);
    134 
    135 WORD32 ixheaacd_read_bit(ia_bit_buf_struct *data, WORD32 no_of_bits);
    136 
    137 #endif /* IXHEAACD_BITBUFFER_H */
    138