diff options
| author | Umang Jain <email@uajain.com> | 2020-09-25 00:06:42 +0530 |
|---|---|---|
| committer | Laurent Pinchart <laurent.pinchart@ideasonboard.com> | 2020-09-29 05:55:08 +0300 |
| commit | de20d00455fbd87815a0946eaf957a9368e72a6a (patch) | |
| tree | 581491511a121ab8d25937f98417c263d74ee321 /src/android/jpeg/exif.cpp | |
| parent | 51bfc823921095b301a6c68e9e59d8cb4e2ffc2d (diff) | |
android: jpeg: exif: Set timezone information
The EXIF specification defines three timezone related tags, namely
OffsetTime, OffsetTimeOriginal and OffsetTimeDigitized. However,
these are not supported by libexif (as of v0.6.21) hence, carry
the tags' positional values in our implementation until we get
this support from libexif itself.
Since these tags were introduced in EXIF specification v2.31, set
the exif version number explicitly too.
Signed-off-by: Umang Jain <email@uajain.com>
Reviewed-by: Laurent Pinchart <laurent.pinchart@ideasonboard.com>
Signed-off-by: Laurent Pinchart <laurent.pinchart@ideasonboard.com>
Diffstat (limited to 'src/android/jpeg/exif.cpp')
| -rw-r--r-- | src/android/jpeg/exif.cpp | 29 |
1 files changed, 29 insertions, 0 deletions
diff --git a/src/android/jpeg/exif.cpp b/src/android/jpeg/exif.cpp index a5674b3d..32cf8974 100644 --- a/src/android/jpeg/exif.cpp +++ b/src/android/jpeg/exif.cpp @@ -14,6 +14,16 @@ using namespace libcamera; LOG_DEFINE_CATEGORY(EXIF) /* + * List of EXIF tags that we set directly because they are not supported + * by libexif version 0.6.21. + */ +enum class _ExifTag { + OFFSET_TIME = 0x9010, + OFFSET_TIME_ORIGINAL = 0x9011, + OFFSET_TIME_DIGITIZED = 0x9012, +}; + +/* * The Exif class should be instantiated and specific properties set * through the exposed public API. * @@ -51,6 +61,9 @@ Exif::Exif() */ exif_data_set_byte_order(data_, EXIF_BYTE_ORDER_INTEL); + setString(EXIF_IFD_EXIF, EXIF_TAG_EXIF_VERSION, + EXIF_FORMAT_UNDEFINED, "0231"); + /* Create the mandatory EXIF fields with default data. */ exif_data_fix(data_); } @@ -197,6 +210,22 @@ void Exif::setTimestamp(time_t timestamp) setString(EXIF_IFD_0, EXIF_TAG_DATE_TIME, EXIF_FORMAT_ASCII, ts); setString(EXIF_IFD_EXIF, EXIF_TAG_DATE_TIME_ORIGINAL, EXIF_FORMAT_ASCII, ts); setString(EXIF_IFD_EXIF, EXIF_TAG_DATE_TIME_DIGITIZED, EXIF_FORMAT_ASCII, ts); + + /* Query and set timezone information if available. */ + int r = strftime(str, sizeof(str), "%z", &tm); + if (r > 0) { + std::string tz(str); + tz.insert(3, 1, ':'); + setString(EXIF_IFD_EXIF, + static_cast<ExifTag>(_ExifTag::OFFSET_TIME), + EXIF_FORMAT_ASCII, tz); + setString(EXIF_IFD_EXIF, + static_cast<ExifTag>(_ExifTag::OFFSET_TIME_ORIGINAL), + EXIF_FORMAT_ASCII, tz); + setString(EXIF_IFD_EXIF, + static_cast<ExifTag>(_ExifTag::OFFSET_TIME_DIGITIZED), + EXIF_FORMAT_ASCII, tz); + } } void Exif::setOrientation(int orientation) |