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| 型號： | AP77016-B07 |
| 英文描述： | USAP77016-B07 MP3 Audio Decoder Middleware User＇s Manual | User＇s Manual[09/2002] |
| 中文描述： | USAP77016 - B07 MP3音頻解碼器中間件用戶手冊|用戶手冊[09/2002] |
| 文件頁數(shù)： | 20/47頁 |
| 文件大?。?/td> | 291K |
| 代理商： | AP77016-B07 |
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CHAPTER 2 LIBRARY SPECIFICATIONS
User’s Manual U15152EJ2V0UM
20
2.2 Function Specifications
Specifications when calling each library function are shown below.
2.2.1 a2d_InitDec function
[Classification]
[Function name]
[Summary of function]
Initializes RAM areas and sets parameters used by
μ
SAP77016-B08
[Format]
call a2d_InitDec
[Arguments]
R0
Initialization mode
Bit 0
0: Decode RAW_DATA only
1: Decode format with header (ADIF/ADTS)
Bit 8
0: Normal
1: Check header using aac_read_1word function on CRC error
when ADTS decoding
R1
Reserved
R2
Reserved
R3
Reserved
R4
Address of callback function aac_read_1word
R5
Address of callback function aac_dec_fillbits
R6
0x0000 fixed (Address of scratch area lib_Scratch_x)
R7
Address of scratch area lib_Scratch_y
DP0
Pointer to user-defined input buffer (see
Figure 2-1
)
[Return value]
R0
0: Decoding error
1: Decoded object was ADIF/RAW
2: Decoded object was ADTS
[Function]
Initialize RAM areas used by
μ
SAP77016-B08 and set parameters.
[Registers used]
R0, R1, R2, R3, R4, R5, R6, R7, DP0, DP4
[Hardware resourcement]
Maximum stack level
3
Maximum loop stack level
2
Maximum number of repeats
1023
Maximum number of cycles
48413
AAC decoder initialization processing
a2d_InitDec
Caution
The a2d_InitDec function initializes only RAM areas that the
μ
SAP77016-B08 uses. Initialization
of user-defined RAM areas (such as I/O buffers) should be performed in a user program.
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