JEITA CP-3451
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[Notes and Additional Information]
A camera shall not record chunks other than those listed above.
If a camera encounters an unknown chunk when reading the INFO list, it shall skip that chunk. It is possible that the
INFO list will be expanded in the future, and this provision ensures that compatibility will be maintained.
Information shall be recorded in accord with the general INFO list stipulations.
All the information on the INFO list is optional, and does not have to be recorded.
The INFO list used for Exif audio files consists of pre-registered, general-purpose chunks only, which means this
information may be read by commercial "RIFF Form Reader" software (such as the utility software provided with
Windows).
5.6.3 Chunks for Attribute Information Specific to Exif Audio Files
Recording of attribute information specific to Exif audio files is done as follows.
Exif-specific attributes are those not defined for ordinary WAVE Form Audio Files but only for Exif audio files. This
is auxiliary information with no influence on Interoperability of the audio data itself. For this reason an Exif audio file
can still be compatible with a standard WAVE Form Audio File.
The attributes specific to Exif audio files are recorded as follows.
(1) LIST chunk is used.
The compatibility noted above is realized by using a pre-registered, general-purpose LIST chunk to record the
attribute information specific to Exif audio files. Since it may be used with all the LIST chunk form types, this chunk
may be put in the WAVE Form Audio File. The individual information is recorded in sub-chunks of the LIST chunk.
(2) A dedicated list type "exif" is defined.
The information in the LIST chunk is explicitly labeled as information specific to Exif audio files by defining a
dedicated list type. The following is used as this list type.
· Dedicated Exif list type: "exif" (all lower-case letters)
The attributes specific to Exif audio files cannot be used in the WAVE Form Audio File format, so it is all written in
lower-case letters.
Hereafter, the notation "exif list" is used to mean the LIST chunk whose list type is exif.
(3) A dedicated chunk is defined for each of the attributes.
Since there are no corresponding existing chunks, a dedicated chunk is defined to record the attribute information
specific to Exif audio files. The information items and their chunks are described below.