BU94603KV Functional Specifications
22/57
Confidential
Target Spec 0.12
VI.1.2 Playable file
The playable file extensions are *.M4A, *.3GP and *.MP4 for AAC files, *.WMA and *.ASF for WMA files,
*.MP3, *.MP2 and *.MP1 for MP3 files. (Upper case letters and lower case letters are not distinguished.)
Note that the file operation differs in the following cases:
(1) SEL_MP3: See SEL_MP3 for details.
(2) Attribute: A AAC/WMA/MP3 file whose attribute is masked can be played. A file with system
attributes cannot be played.
(3) Data destroyed file: When the data section of AAC/WMA/MP3 file is destroyed, the music data of the
file can be played as much as possible rather than disabling to play the entire file. The section
which cannot be played is muted. However, AMUTE terminal remains the H output level. When the
header section of WMA and AAC file is destroyed, it plays next.
(4) File name: A file name and its size do not depend on playing.
(5) Extension: When file data is configured in the non-AAC format and its file extension is *.M4A, *.3GP
and *.MP4 the state is play next. When file data is configured in the non-WMA format and its file
extension is *.WMA, or *.ASF, the state is play next. When file data is configured in the non-MP3
format and its file extension is *.MP3, *.MP2 or *.MP1, the state is silent playing basically. If playable
data can be read, only a part of the file can be played. The information on time required to output
serial status also becomes uncertain. Then, partial output is done but the correct time information is
not output.
(6) File size: When file size is
“0”, the file do not recognize at AAC/WMA/MP3 files.
(7) This LSI corresponds to the AAC file encoded by iTunes. The versions of iTunes checked operation
are 4.*, 5.*, 6.*, and 7.0 to 7.5. The AAC file encoded with other software may cause fault, such as
being in the middle of reproduction and skipping to next.
(8) When the extension of WMA file is *.ASF, this LSI corresponds to the ASF file of only an audio
stream.
VI.1.3 Playing sequence
The playing sequence of AAC/WMA/MP3 files is determined based on the following rules. See Figure
VI.1.3.
(1) Folders are sorted in the order written in FAT (in the order of FAT), and files 1 to 100 are sorted in the
order of UNICODE. (*See Chapter VI. 1.4.) Files over 100 are sorted in the order of FAT.
Folders over 100 are sorted in the same manner.
AAC/WMA/MP3 files are sorted by AAC/WMA/MP3 following SEL_MP3. Folders are sorted
including null folders and those in which AAC/WMA/MP3 files are not written. Within each folder,
AAC/WMA/MP3 files over 100 and folders over 100 are played in the order written to the FAT
directory entry.
Since how to write to the directory entry depends on the OS (Operating System) processing to write
to the memory, you cannot understand the file playing sequence.
(2) When AAC/WMA/MP3 file exists in the root folder (the highest layer), the AAC/WMA/MP3 file is
played first.
(3) When all the AAC/WMA/MP3 files in the root folder have been played, those in the folder under the
root folder, if any, are played.
(4) When a folder is layered under that, AAC/WMA/MP3 files in the folder are played. When not, the
master searches any other folders at the same layer and plays the one, if any.
(5) After playing all the files, the master returns to the root folder as described in (2) and start playing
with the first sorted file.
VI.1.4 Folder/file sort
Folders and files are sorted in the following sequence using this LSI.
(1) Obtain up to 100 files and 100 folders in the order written to FAT.
(2) Compare the obtained folder/file names up to 14 characters (including filename extensions) and sort
them in the ascending order.*
(3) When the same strings are generated, follow the order written to FAT. When the same strings are
generated and the extension is different, MP3 file is first, WMA file is second, and AAC file is last.
(4) For 101 or more folders and files, follow the order written to FAT.
*
The processing of the file name and the folder name is shown in the following.
1)When the LFN(long file name) entry exists, folder/filename is processed as one character in two
bytes.
2)When the LFN entry doesn't exist, the SFN(short file name) entry is processed as follows.
