JEITA CP-3451
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Table 7 Implementation of Defined and Undefined Character Codes
ID Code
Exif Reader Implementation
Defined
(JIS, ASCII, etc.)
Determines the ID code and displays it in accord with the reader capability.
Undefined
(all NULL)
Depends on the localized PC in each country. (If a character code is used for
which there is no clear specification like Shift-JIS in Japan, Undefined is used.)
Although the possibility of unreadable characters exists, display of these
characters is left as a matter of reader implementation.
When a UserComment area is set aside, it is recommended that the ID code be ASCII and that the following user
comment part be filled with blank characters [20.H].
E. Tag Relating to Related File
RelatedSoundFile
This tag is used to record the name of an audio file related to the image data. The only relational information
recorded here is the Exif audio file name and extension (an ASCII string consisting of 8 characters + '.' + 3
characters). The path is not recorded. Stipulations on audio are given in section 0. File naming conventions are
given in section 0.
When using this tag, audio files shall be recorded in conformance to the Exif audio format. Writers are also allowed
to store the data such as Audio within APP2 as Flashpix extension stream data.
Audio files shall be recorded in conformance to the Exif audio format.
The mapping of Exif image files and audio files is done in any of the three ways shown in Table 8. If multiple files
are mapped to one file as in [2] or [3] of this table, the above format is used to record just one audio file name. If
there are multiple audio files, the first recorded file is given.
In the case of [3] in Table 8, for example, for the Exif image file "DSC00001.JPG" only "SND00001.WAV" is given
as the related Exif audio file.
When there are three Exif audio files "SND00001.WAV", "SND00002.WAV" and "SND00003.WAV", the Exif image
file name for each of them, "DSC00001.JPG," is indicated. By combining multiple relational information, a variety of
playback possibilities can be supported. The method of using relational information is left to the implementation on
the playback side. Since this information is an ASCII character string, it is terminated by NULL.
Table 8 Mapping between Image and Audio Files
Relationship
Exif Image File
Exif Audio File
[1]
1 to 1
DSC00001.JPG
SND00001.WAV
[2]
Plural to 1
DSC00001.JPG
DSC00002.JPG
DSC00003.JPG
SND00001.WAV
[3]
1 to plural
DSC00001.JPG
SND00001.WAV
SND00002.WAV
SND00003.WAV