USBB17AP77016-XXX-B11 NEC Electronics, USBB17AP77016-XXX-B11 Datasheet - Page 17

• Manufacturer Part Number: USBB17AP77016-XXX-B11
• Description: DSP middleware(WMA (Windows Media Audio)decoder)
• Manufacturer: NEC Electronics

2.3
2.3.1
The specifications for calling each library function are as follows.
[Classification]
[Function name]
[Summary of function] Initializes the RAM area and sets the parameters used by the µ SAP77016-B11.
[Format]
[Arguments]
[Return value]
[Function]
[Registers used]
[Hardware resources]
[Remark]
Function Specifications
wmad_FileDecodeInit function
WMA decoder initialization processing function
B11. If the bit stream data contains contents information, this information can be acquired.
An area (structure) for storing contents information must be prepared beforehand (refer to
Table 2-7 Members of Contents Information Structure).
R0, R1, R2, R3, R4, R5, R6, R7,
DP0, DP1, DP2, DP3, DP4, DN0
Because this function calls the wmad_FileCBGetData function, when using the call stack
via the wmad_FileCBGetData function, the maximum stack level will increase by the
amount of that call stack.
maximum number of cycles depend on the number of repetitions and cycles of the
wmad_FileCBGetData function. The values above are for when the wmad_FileCBGetData
function of the sample source is used and each item of contents information is acquired as
40 characters. The maximum number of cycles may also differ depending on factors such
as the number of characters in the acquired contents information and whether marker
information is included or not.
wmad_FileDecodeInit
call wmad_FileDecodeInit
This function sets the parameters and initializes the RAM area used by the µ SAP77016-
R0L
R1
R2L
R0
Maximum stack level
Maximum loop stack level
Maximum number of repetitions
Maximum number of cycles
Return Value
Argument
CHAPTER 2 LIBRARY SPECIFICATIONS
User’s Manual U15683EJ1V0UM
Start address of user-defined wmad_FileCBGetData function
Contents information acquisition
Start address of structure storing contents information (X memory)
Error code (see 2.4 Error Information for error code details)
1: Acquire 0: Do not acquire
Note also that the maximum number of repetitions and
Description
Description
5.5 × 10
502
5
2
4
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