Also introduce new supported RAW image file formats, PEF and SRW.
RAW image file formats are not defined in PTP 1.2 specification except
for DNG. They are mostly built on top of TIFF or TIFF/EP. (Fuji's RAF
is the exception).
In this CL, image file formats are classified newly as below:
DNG: dng
TIFF: cr2, nrw, arw, rw2, orf, pef, srw
TIFF/EP: nef
Unknown Image Formats(FORMAT_DEFINED): wbmap, webp, raf
I referred to the following documents for defining MTP formats of RAW
images:
* http://www.rags-int-inc.com/PhotoTechStuff/RawStandards/RawSummary.html
* https://en.wikipedia.org/wiki/Raw_image_format
Bug: 26552863, Bug: 26626825
Change-Id: Ia218f6320c4c1ff051a23ca0060ceac46134b0d7
This CL depends on piex (github.com/google/piex),
which is owned by Google Photos's RAW team.
piex is capable of reading EXIF data that contains
metadata, and finding the positions in an image of
thumbnail and preview images from RAW images.
piex supports DNG, CR2, NEF, NRW, ARW, RW2, ORF
and RAF image file formats.
ExifInterface gets thumbnail and metadata information
from the above RAW image formats via piex.
Bug: 26177215
Change-Id: I529f8032bcb2a9d3d9e857ff1365a26a4f040066
