Move the warning on unsupported units to the swicth-case. Move fetching the
pending tags down to where we use them.

Otherwise we never write the tag. This would also be consistent with the code in
deserialize_scene_type().

Exif uses tags like  image-vertical-ppi or image-horizontal-ppi which are
registered in gst_tag_register_musicbrainz_tags(), but neither GstExifReader
nor GstExifWriter register them.

https://bugzilla.gnome.org/show_bug.cgi?id=648459

Adds mapping for GST_TAG_CAPTURING_EXPOSURE_COMPENSATION for exif
library.

Includes unit tests.

https://bugzilla.gnome.org/show_bug.cgi?id=646744

Fixes a valgrind warning on jifmux tests on -bad caused by
unitialized bytes.

Fixes #637758

gst_buffer_set_data() does not set GST_BUFFER_MALLOCDATA, but
the code assumes the buffer takes ownership of the memory
allocated earlier.

Adds a tag to indicate the source/device used for the capture.

Already maps it in exif and adds tests.

API: GST_TAG_CAPTURING_SOURCE

https://bugzilla.gnome.org/show_bug.cgi?id=631773

Adds a tag to inform what mode was used by a camera to calculate
the picture capturing exposure

Also adds mapping to exif and tests

API: GST_TAG_CAPTURING_METERING_MODE

https://bugzilla.gnome.org/show_bug.cgi?id=631773

Adds new tag for tagging sharpness processing used
when capturing an image. Also maps it in the exif
tags.

Tests included.

API: GST_TAG_CAPTURING_SHARPNESS

https://bugzilla.gnome.org/show_bug.cgi?id=631773

Updates datetime functions to latest APIs in core

Maps GST_TAG_GEO_LOCATION_HORIZONTAL_ERROR to the
GPSHPositionError tag in exif.

Tests included.

Adds mappings for GST_TAG_IMAGE_HORIZONTAL/VERTICAL_PPI into
our exif lib

Tests included.

Fixes #626570

Old gcc complains about possibly uninitialized variables which
are always initialized before usage in reality. Fixes bug #628747.

Adds check for log2 and only use it in exif library if it is
available.

Put some tags in their correct IFDs

FlashPixVersion is mandatory and constant. Write it always.

Adds a mapping for GST_TAG_CAPTURING_FLASH_FIRED/_MODE to
the exif Flash tag.

Tests included.

Adds mappings from:
GST_TAG_CAPTURING_EXPOSURE_PROGRAM -> ExposureProgram
GST_TAG_CAPTURING_EXPOSURE_MODE -> ExposureMode
GST_TAG_CAPTURING_SCENE_CAPTURE_TYPE -> SceneCaptureType
GST_TAG_CAPTURING_GAIN_ADJUSTMENT -> GainControl
GST_TAG_CAPTURING_WHITE_BALANCE -> WhiteBalance
GST_TAG_CAPTURING_CONTRAST -> Constrast
GST_TAG_CAPTURING_SATURATION -> Saturation

Also renames gst_tag_image_orientation_from_exif_value and
gst_tag_image_orientation_to_exif_value to remove the 'gst'
prefix and not including in the win32 defs.

Tests included.

Use macros for exif ids to avoid having those numbers spread
all over the code.

Adds the following mappings for the exif helper:
* GST_TAG_CAPTURING_DIGITAL_ZOOM_RATIO -> DigitalZoomRatio
* GST_TAG_CAPTURING_FOCAL_LENGTH -> FocalLength
* GST_TAG_CAPTURING_SHUTTER_SPEED -> ExposureTime, ShutterSpeedValue
* GST_TAG_CAPTURING_FOCAL_RATIO -> FNumber, ApertureValue
* GST_TAG_CAPTURING_ISO_SPEED -> ISOSpeed, PhotographicSensitivity

Tests included.

Adds mapping for GST_TAG_APPLICATION_DATA to the exif
'maker-note' tag.

Do not use the result of inner ifd's parsing to increment
the current tag index. The reasons are:

1) The function returns a boolean.
2) The inner ifd's tags are in a separate table, so they shouldn't
interfere with its parent ifd table parsing.

ExifVersion is from the 'exif' ifd, not the 0th ifd.

Use some macros to declare serialization/deserialization
functions prototypes.

datetimes can also be represented by the 0x132 tag. Map it, too.

Do not skip one extra tag when parsing image-orientation tags.

Fixes a compiler warning on the OS X buildbot.

adds xmp and exif helper library mappings for GST_TAG_APPLICATION_NAME
tag.

Write ExifVersion tag unconditionally when creating exif
buffers. Might help other applications parsing of this data.

Fixes a bug that made exif helper lib fail to rewrite inner ifd tags
offsets when there were more than 1 inner ifd.

Adds mapping to the exif helper library for GST_TAG_DATE_TIME.
Tests included.

https://bugzilla.gnome.org/show_bug.cgi?id=594504

Adds GST_TAG_IMAGE_ORIENTATION to the exif helper lib mapped tags.
Tests included.

I hate thee macosx

Only check for valid byte-order values when creating the
exif readers and writers

Adds mappings for:
GST_TAG_GEO_LOCATION_CAPTURE_DIRECTION
GST_TAG_GEO_LOCATION_MOVEMENT_DIRECTION
GST_TAG_GEO_LOCATION_MOVEMENT_SPEED
GST_TAG_GEO_LOCATION_ELEVATION

Does some refactoring in the code to reduce number of parameters
passed to functions

Tests included.

Adds exif helper lib functions to parse exif buffers from/to
taglists. Exif is tipically used in jpeg images, but it can
also be embedded into TIFF, AVI and WAV formats.

Adds a couple function to handle exif in tiff header structures, that is how
exif is embedded in jpeg and (obviously) in tiff.

API: gst_tag_list_to_exif_buffer
API: gst_tag_list_to_exif_buffer_with_tiff_header
API: gst_tag_list_from_exif_buffer
API: gst_tag_list_from_exif_buffer_with_tiff_header

Fixes #614872