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android: exif: Fix thumbnail buffer lifetime

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Previously the thumbnail buffer is destructed before even being used in
Exif. This patch moves the buffer into class Exif, so that the developer
won't need to worry about its lifetime.

Signed-off-by: Harvey Yang <chenghaoyang@chromium.org>
Reviewed-by: Laurent Pinchart <laurent.pinchart@ideasonboard.com>
Reviewed-by: Umang Jain <umang.jain@ideasonboard.com>
Signed-off-by: Umang Jain <umang.jain@ideasonboard.com>
This commit is contained in:
Cheng-Hao Yang 2022-07-22 07:06:00 +00:00 • committed by Umang Jain
parent 5646849b59
commit 74794de987
3 changed files with 10 additions and 10 deletions
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13
src/android/jpeg/exif.cpp
View file

@ -430,16 +430,13 @@ void Exif::setOrientation(int orientation)
setShort(EXIF_IFD_0, EXIF_TAG_ORIENTATION, value);
}
/*
* The thumbnail data should remain valid until the Exif object is destroyed.
* Failing to do so, might result in no thumbnail data being set even after a
* call to Exif::setThumbnail().
*/
void Exif::setThumbnail(Span<const unsigned char> thumbnail,
void Exif::setThumbnail(std::vector<unsigned char> &&thumbnail,
Compression compression)
{
data_->data = const_cast<unsigned char *>(thumbnail.data());
data_->size = thumbnail.size();
thumbnailData_ = std::move(thumbnail);
data_->data = thumbnailData_.data();
data_->size = thumbnailData_.size();
setShort(EXIF_IFD_0, EXIF_TAG_COMPRESSION, compression);
}

5
src/android/jpeg/exif.h
View file

@ -10,6 +10,7 @@
#include <chrono>
#include <string>
#include <time.h>
#include <vector>
#include <libexif/exif-data.h>
@ -60,7 +61,7 @@ public:
void setOrientation(int orientation);
void setSize(const libcamera::Size &size);
void setThumbnail(libcamera::Span<const unsigned char> thumbnail,
void setThumbnail(std::vector<unsigned char> &&thumbnail,
Compression compression);
void setTimestamp(time_t timestamp, std::chrono::milliseconds msec);
@ -106,4 +107,6 @@ private:
unsigned char *exifData_;
unsigned int size_;
std::vector<unsigned char> thumbnailData_;
};

2
src/android/jpeg/post_processor_jpeg.cpp
View file

@ -166,7 +166,7 @@ void PostProcessorJpeg::process(Camera3RequestDescriptor::StreamBuffer *streamBu
std::vector<unsigned char> thumbnail;
generateThumbnail(source, thumbnailSize, quality, &thumbnail);
if (!thumbnail.empty())
exif.setThumbnail(thumbnail, Exif::Compression::JPEG);
exif.setThumbnail(std::move(thumbnail), Exif::Compression::JPEG);
}
resultMetadata->addEntry(ANDROID_JPEG_THUMBNAIL_SIZE, data, 2);