NekoCWD/libcamera
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android: jpeg: Support an initial set of EXIF metadata tags

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Create a Exif object with various metadata tags set, just before
the encoder starts to encode the frame. The object is passed
directly as libcamera::Span<> to make sure EXIF tags can be set
in a single place i.e. in CameraDevice and the encoder only has
the job to write the data in the final output.

Signed-off-by: Kieran Bingham <kieran.bingham@ideasonboard.com>
Signed-off-by: Umang Jain <email@uajain.com>
Reviewed-by: Kieran Bingham <kieran.bingham@ideasonboard.com>
Reviewed-by: Laurent Pinchart <laurent.pinchart@ideasonboard.com>
Signed-off-by: Laurent Pinchart <laurent.pinchart@ideasonboard.com>
This commit is contained in:
Umang Jain 2020-09-09 16:44:45 +05:30 • committed by Laurent Pinchart
parent c3d1329b93
commit 6f09a619cc
6 changed files with 88 additions and 4 deletions
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9
src/android/jpeg/encoder_libjpeg.cpp
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@ -180,7 +180,8 @@ void EncoderLibJpeg::compressNV(const libcamera::MappedBuffer *frame)
}
int EncoderLibJpeg::encode(const FrameBuffer *source,
const libcamera::Span<uint8_t> &dest)
const libcamera::Span<uint8_t> &dest,
const libcamera::Span<const uint8_t> &exifData)
{
MappedFrameBuffer frame(source, PROT_READ);
if (!frame.isValid()) {
@ -204,6 +205,12 @@ int EncoderLibJpeg::encode(const FrameBuffer *source,
jpeg_start_compress(&compress_, TRUE);
if (exifData.size())
/* Store Exif data in the JPEG_APP1 data block. */
jpeg_write_marker(&compress_, JPEG_APP0 + 1,
static_cast<const JOCTET *>(exifData.data()),
exifData.size());
LOG(JPEG, Debug) << "JPEG Encode Starting:" << compress_.image_width
<< "x" << compress_.image_height;