USBB17AP77016-XXX-B11 NEC Electronics, USBB17AP77016-XXX-B11 Datasheet - Page 31

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

2.5.4
The following structures must be prepared in order to acquire WMA file information or contents information.
(1) File information structure
(2) Contents information structure
To acquire WMA file information, prepare the following structure in the X memory and execute the
wmad_FileDecodeInfo function.
Note The µ SAP77016-B11 only supports data of version 2 of the WMA file format. Data encoded using
To acquire information such as the title of a track, prepare the following contents information structure and
contents character string area in the X memory and execute the wmad_FileDecodeInit function.
Specify the maximum length (requested number of characters) of the contents information as an even number.
If the contents information of the bit stream data is less than the requested number of characters, the length of
the character string actually acquired (including the terminal code “0x0000”) is stored as the maximum length
of the character string in the structure.
Structures
WMA CODEC Version 2, 7, or 8 is version 2 of the WMA file format.
Version of WMA file format
Sampling frequency [Hz]
Number of channels
Playback time [ms]
Packet size [bytes]
Offset to first packet [bytes]
Offset to last packet [bytes]
Use of DRM 0: DRM not used, 1: DRM used
Bit rate [bps]
Maximum length of title character string [bytes]
Maximum length of creator character string [bytes]
Maximum length of writer character string [bytes]
Maximum length of explanatory note character string [bytes]
Maximum length of regulation character string [bytes]
Start address of title character string area
Start address of creator character string area
Start address of writer character string area
Start address of explanatory note character string area
Start address of regulation character string area
Table 2-7. Members of Contents Information Structure
Table 2-6. Members of File Information Structure
CHAPTER 2 LIBRARY SPECIFICATIONS
Note
User’s Manual U15683EJ1V0UM
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Size [Words]
Size [Words]
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1
2
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2
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2
1
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