USBB17AP77016-XXX-B11 NEC Electronics, USBB17AP77016-XXX-B11 Datasheet - Page 18

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

2.3.2
18
[Classification]
[Function name]
[Summary of function] Decodes the bit stream data and creates the data required for PCM data creation.
[Format]
[Arguments]
[Return value]
[Function]
[Registers used]
[Hardware resources]
[Remark]
wmad_FileDecodeData function
WMA decode processing function
R0, R1, R2, R3, R4, R5, R6, R7,
Because this function calls the wmad_FileCBGetData function, when using the call stack
wmad_FileDecodeData
call wmad_FileDecodeData
None
This function decodes the bit stream data and stores the data required for PCM data
creation in the static area. When decoding has finished, the error code cWMA_Failed or
cWMA_NoMoreFrames is returned. Note that it is not necessary to subsequently execute
the wmad_FileGetPCM function when the error code is not cWMA_NoErr. This function
should be re-executed only after the wmad_FileGetPCM function is executed and all the
PCM data that can be created at that time is created.
DP0, DP1, DP2, DP3, DP4, DP5, DP6, DP7,
DN0, DN1, DN2, DN4, DN5, DN6, DN7
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.
R0
Maximum stack level
Maximum loop stack level
Maximum number of repetitions
Maximum number of cycles
Return Value
CHAPTER 2 LIBRARY SPECIFICATIONS
User’s Manual U15683EJ1V0UM
Error code (see 2.4 Error Information for error code details)
Note also that the maximum number of repetitions and
Description
2.7 × 10
25
7
2
6