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Diffstat (limited to 'src/android/jpeg/post_processor_jpeg.cpp')
-rw-r--r--src/android/jpeg/post_processor_jpeg.cpp105
1 files changed, 105 insertions, 0 deletions
diff --git a/src/android/jpeg/post_processor_jpeg.cpp b/src/android/jpeg/post_processor_jpeg.cpp
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+++ b/src/android/jpeg/post_processor_jpeg.cpp
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+/* SPDX-License-Identifier: GPL-2.0-or-later */
+/*
+ * Copyright (C) 2020, Google Inc.
+ *
+ * post_processor_jpeg.cpp - JPEG Post Processor
+ */
+
+#include "post_processor_jpeg.h"
+
+#include "../camera_device.h"
+#include "../camera_metadata.h"
+#include "encoder_libjpeg.h"
+#include "exif.h"
+
+#include <libcamera/formats.h>
+
+#include "libcamera/internal/log.h"
+
+using namespace libcamera;
+
+LOG_DEFINE_CATEGORY(JPEG);
+
+PostProcessorJpeg::PostProcessorJpeg(CameraDevice *device)
+ : cameraDevice_(device)
+{
+}
+
+int PostProcessorJpeg::configure(const StreamConfiguration &inCfg,
+ const StreamConfiguration &outCfg)
+{
+ if (inCfg.size != outCfg.size) {
+ LOG(JPEG, Error) << "Mismatch of input and output stream sizes";
+ return -EINVAL;
+ }
+
+ if (outCfg.pixelFormat != formats::MJPEG) {
+ LOG(JPEG, Error) << "Output stream pixel format is not JPEG";
+ return -EINVAL;
+ }
+
+ streamSize_ = outCfg.size;
+ encoder_ = std::make_unique<EncoderLibJpeg>();
+
+ return encoder_->configure(inCfg);
+}
+
+int PostProcessorJpeg::process(const libcamera::FrameBuffer *source,
+ const libcamera::Span<uint8_t> &destination,
+ CameraMetadata *metadata)
+{
+ if (!encoder_)
+ return 0;
+
+ /* Set EXIF metadata for various tags. */
+ Exif exif;
+ /* \todo Set Make and Model from external vendor tags. */
+ exif.setMake("libcamera");
+ exif.setModel("cameraModel");
+ exif.setOrientation(cameraDevice_->orientation());
+ exif.setSize(streamSize_);
+ /*
+ * We set the frame's EXIF timestamp as the time of encode.
+ * Since the precision we need for EXIF timestamp is only one
+ * second, it is good enough.
+ */
+ exif.setTimestamp(std::time(nullptr));
+ if (exif.generate() != 0)
+ LOG(JPEG, Error) << "Failed to generate valid EXIF data";
+
+ int jpeg_size = encoder_->encode(source, destination, exif.data());
+ if (jpeg_size < 0) {
+ LOG(JPEG, Error) << "Failed to encode stream image";
+ return jpeg_size;
+ }
+
+ /*
+ * Fill in the JPEG blob header.
+ *
+ * The mapped size of the buffer is being returned as
+ * substantially larger than the requested JPEG_MAX_SIZE
+ * (which is referenced from maxJpegBufferSize_). Utilise
+ * this static size to ensure the correct offset of the blob is
+ * determined.
+ *
+ * \todo Investigate if the buffer size mismatch is an issue or
+ * expected behaviour.
+ */
+ uint8_t *resultPtr = destination.data() +
+ cameraDevice_->maxJpegBufferSize() -
+ sizeof(struct camera3_jpeg_blob);
+ auto *blob = reinterpret_cast<struct camera3_jpeg_blob *>(resultPtr);
+ blob->jpeg_blob_id = CAMERA3_JPEG_BLOB_ID;
+ blob->jpeg_size = jpeg_size;
+
+ /* Update the JPEG result Metadata. */
+ metadata->addEntry(ANDROID_JPEG_SIZE, &jpeg_size, 1);
+
+ const uint32_t jpeg_quality = 95;
+ metadata->addEntry(ANDROID_JPEG_QUALITY, &jpeg_quality, 1);
+
+ const uint32_t jpeg_orientation = 0;
+ metadata->addEntry(ANDROID_JPEG_ORIENTATION, &jpeg_orientation, 1);
+
+ return 0;
+}