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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 #include <setjmp.h>
     24 
     25 #define CRC_ADTS_HEADER_LEN 56
     26 #define CRC_ADTS_RAW_DATA_BLK_LEN 192
     27 #define CRC_ADTS_RAW_IIND_ICS 128
     28 #define CRC_ADTS_LEN_ALL -1
     29 
     30 #define MAX_REG_SIZE 192
     31 #define MAX_CRC_REGS 7
     32 
     33 struct ia_crc_bit_buf_struct {
     34   UWORD8 *ptr_bit_buf_base;
     35   UWORD8 *ptr_bit_buf_end;
     36 
     37   UWORD8 *ptr_read_next;
     38   WORD16 bit_pos;
     39   WORD32 cnt_bits;
     40 
     41   WORD32 size;
     42 };
     43 
     44 typedef struct {
     45   UWORD8 active;
     46   WORD32 buf_size;
     47   WORD32 max_bits;
     48   UWORD32 bit_cnt;
     49   WORD32 bit_buf_cnt;
     50   struct ia_crc_bit_buf_struct str_bit_buf;
     51 } ia_crc_reg_data_struct;
     52 
     53 typedef struct {
     54   UWORD8 crc_active;
     55   UWORD16 no_reg;
     56   UWORD16 file_value;
     57   UWORD16 crc_lookup[256];
     58   ia_crc_reg_data_struct str_crc_reg_data[MAX_CRC_REGS];
     59 } ia_adts_crc_info_struct;
     60 
     61 typedef struct ia_bit_buf_struct {
     62   UWORD8 *ptr_bit_buf_base;
     63   UWORD8 *ptr_bit_buf_end;
     64 
     65   UWORD8 *ptr_read_next;
     66 
     67   WORD32 bit_pos;
     68   WORD32 cnt_bits;
     69 
     70   WORD32 size;
     71 
     72   WORD32 adts_header_present;
     73   WORD32 crc_check;
     74   WORD8 protection_absent;
     75   WORD8 no_raw_data_blocks;
     76   ia_adts_crc_info_struct str_adts_crc_info;
     77   ia_adts_crc_info_struct *pstr_adts_crc_info;
     78 
     79   WORD32 initial_cnt_bits;
     80   WORD32 audio_mux_align;
     81   WORD32 bit_count;
     82   WORD32 valid_bits;
     83   UWORD8 byte;
     84   UWORD8 *byte_ptr;
     85   UWORD8 *ptr_start;
     86   WORD32 write_bit_count;
     87   WORD32 max_size;
     88   jmp_buf *xaac_jmp_buf;
     89 
     90 } ia_bit_buf_struct;
     91 
     92 typedef struct ia_bit_buf_struct *ia_handle_bit_buf_struct;
     93 
     94 typedef struct ia_crc_bit_buf_struct *ia_crc_bit_buf_struct_handle;
     95 
     96 VOID ixheaacd_byte_align(ia_bit_buf_struct *it_bit_buff,
     97                          WORD32 *ptr_byte_align_bits);
     98 
     99 ia_bit_buf_struct *ixheaacd_create_bit_buf(ia_bit_buf_struct *it_bit_buff,
    100                                            UWORD8 *ptr_bit_buf_base,
    101                                            WORD32 bit_buf_size);
    102 
    103 ia_bit_buf_struct *ixheaacd_create_init_bit_buf(ia_bit_buf_struct *it_bit_buff,
    104                                                 UWORD8 *ptr_bit_buf_base,
    105                                                 WORD32 bit_buf_size);
    106 
    107 WORD32 ixheaacd_read_bits_buf(ia_bit_buf_struct *it_bit_buff, WORD no_of_bits);
    108 
    109 WORD32 ixheaacd_skip_bits_buf(ia_bit_buf_struct *it_bit_buff, WORD no_of_bits);
    110 
    111 WORD32 ixheaacd_show_bits_buf(ia_bit_buf_struct *it_bit_buff, WORD no_of_bits);
    112 
    113 VOID ixheaacd_read_bidirection(ia_bit_buf_struct *it_bit_buff,
    114                                WORD32 ixheaacd_drc_offset);
    115 
    116 UWORD32 ixheaacd_aac_showbits_32(UWORD8 *ptr_read_next, WORD32 cnt_bits,
    117                                  WORD32 *increment);
    118 
    119 UWORD32 ixheaacd_aac_read_byte(UWORD8 **ptr_read_next, WORD32 *bit_pos,
    120                                WORD32 *readword);
    121 
    122 UWORD32 ixheaacd_aac_read_byte_corr(UWORD8 **ptr_read_next, WORD32 *ptr_bit_pos,
    123                                     WORD32 *readword, UWORD8 *p_bit_buf_end);
    124 
    125 UWORD32 ixheaacd_aac_read_byte_corr1(UWORD8 **ptr_read_next,
    126                                      WORD32 *ptr_bit_pos, WORD32 *readword,
    127                                      UWORD8 *p_bit_buf_end);
    128 
    129 #define get_no_bits_available(it_bit_buff) ((it_bit_buff)->cnt_bits)
    130 #define ixheaacd_no_bits_read(it_bit_buff) \
    131   ((it_bit_buff)->size - (it_bit_buff)->cnt_bits)
    132 
    133 WORD32 ixheaacd_aac_read_bit_rev(ia_bit_buf_struct *it_bit_buff);
    134 WORD32 ixheaacd_aac_read_bit(ia_bit_buf_struct *it_bit_buff);
    135 
    136 VOID ixheaacd_write_bit(ia_bit_buf_struct *it_bit_buff, WORD32 value,
    137                         WORD32 no_of_bits);
    138 
    139 WORD32 ixheaacd_read_bit(ia_bit_buf_struct *data, WORD32 no_of_bits);
    140 
    141 #endif /* IXHEAACD_BITBUFFER_H */
    142