android: Set result metadata and EXIF fields based on request metadata

Set the following android result metadata:
- ANDROID_LENS_FOCAL_LENGTH
- ANDROID_LENS_APERTURE
- ANDROID_JPEG_GPS_TIMESTAMP
- ANDROID_JPEG_GPS_COORDINATES
- ANDROID_JPEG_GPS_PROCESSING_METHOD

And the following EXIF fields:
- GPSDatestamp
- GPSTimestamp
- GPSLocation
  - GPSLatitudeRef
  - GPSLatitude
  - GPSLongitudeRef
  - GPSLongitude
  - GPSAltitudeRef
  - GPSAltitude
- GPSProcessingMethod
- FocalLength
- ExposureTime
- FNumber
- ISO
- Flash
- WhiteBalance
- SubsecTime
- SubsecTimeOriginal
- SubsecTimeDigitized

Based on android request metadata.

This allows the following CTS tests to pass:
- android.hardware.camera2.cts.StillCaptureTest#testFocalLengths
- android.hardware.camera2.cts.StillCaptureTest#testJpegExif

Signed-off-by: Paul Elder <paul.elder@ideasonboard.com>
Reviewed-by: Laurent Pinchart <laurent.pinchart@ideasonboard.com>
Reviewed-by: Jacopo Mondi <jacopo@jmondi.org>

src/android/camera_device.cpp

@@ -708,7 +708,7 @@ std::tuple<uint32_t, uint32_t> CameraDevice::calculateStaticMetadataSize()
 	 * Currently: 53 entries, 782 bytes of static metadata
 	 */
 	uint32_t numEntries = 53;
-	uint32_t byteSize = 782;
+	uint32_t byteSize = 802;
 
 	/*
 	 * Calculate space occupation in bytes for dynamically built metadata
@@ -1253,6 +1253,8 @@ const camera_metadata_t *CameraDevice::getStaticMetadata()
 		ANDROID_CONTROL_VIDEO_STABILIZATION_MODE,
 		ANDROID_FLASH_MODE,
 		ANDROID_FLASH_STATE,
+		ANDROID_LENS_APERTURE,
+		ANDROID_LENS_FOCAL_LENGTH,
 		ANDROID_LENS_STATE,
 		ANDROID_LENS_OPTICAL_STABILIZATION_MODE,
 		ANDROID_SENSOR_TIMESTAMP,
@@ -1264,6 +1266,9 @@ const camera_metadata_t *CameraDevice::getStaticMetadata()
 		ANDROID_NOISE_REDUCTION_MODE,
 		ANDROID_REQUEST_PIPELINE_DEPTH,
 		ANDROID_SCALER_CROP_REGION,
+		ANDROID_JPEG_GPS_COORDINATES,
+		ANDROID_JPEG_GPS_PROCESSING_METHOD,
+		ANDROID_JPEG_GPS_TIMESTAMP,
 		ANDROID_JPEG_SIZE,
 		ANDROID_JPEG_QUALITY,
 		ANDROID_JPEG_ORIENTATION,
@@ -1816,6 +1821,7 @@ void CameraDevice::requestComplete(Request *request)
 		}
 
 		int ret = cameraStream->process(*buffer, &mapped,
+						descriptor->settings_,
 						resultMetadata.get());
 		if (ret) {
 			status = CAMERA3_BUFFER_STATUS_ERROR;
@@ -1912,14 +1918,20 @@ CameraDevice::getResultMetadata(Camera3RequestDescriptor *descriptor,
 
 	/*
 	 * \todo Keep this in sync with the actual number of entries.
-	 * Currently: 33 entries, 75 bytes
+	 * Currently: 38 entries, 147 bytes
 	 *
 	 * Reserve more space for the JPEG metadata set by the post-processor.
-	 * Currently: ANDROID_JPEG_SIZE (int32_t), ANDROID_JPEG_QUALITY (byte),
-	 * ANDROID_JPEG_ORIENTATION (int32_t) = 3 entries, 9 bytes.
+	 * Currently:
+	 * ANDROID_JPEG_GPS_COORDINATES (double x 3) = 24 bytes
+	 * ANDROID_JPEG_GPS_PROCESSING_METHOD (byte x 32) = 32 bytes
+	 * ANDROID_JPEG_GPS_TIMESTAMP (int64) = 8 bytes
+	 * ANDROID_JPEG_SIZE (int32_t) = 4 bytes
+	 * ANDROID_JPEG_QUALITY (byte) = 1 byte
+	 * ANDROID_JPEG_ORIENTATION (int32_t) = 4 bytes
+	 * Total bytes for JPEG metadata: 73
 	 */
 	std::unique_ptr<CameraMetadata> resultMetadata =
-		std::make_unique<CameraMetadata>(33, 75);
+		std::make_unique<CameraMetadata>(38, 147);
 	if (!resultMetadata->isValid()) {
 		LOG(HAL, Error) << "Failed to allocate static metadata";
 		return nullptr;
@@ -1984,6 +1996,14 @@ CameraDevice::getResultMetadata(Camera3RequestDescriptor *descriptor,
 	value = ANDROID_FLASH_STATE_UNAVAILABLE;
 	resultMetadata->addEntry(ANDROID_FLASH_STATE, &value, 1);
 
+	camera_metadata_ro_entry_t entry;
+	int ret = descriptor->settings_.getEntry(ANDROID_LENS_APERTURE, &entry);
+	if (ret)
+		resultMetadata->addEntry(ANDROID_LENS_APERTURE, entry.data.f, 1);
+
+	float focal_length = 1.0;
+	resultMetadata->addEntry(ANDROID_LENS_FOCAL_LENGTH, &focal_length, 1);
+
 	value = ANDROID_LENS_STATE_STATIONARY;
 	resultMetadata->addEntry(ANDROID_LENS_STATE, &value, 1);
 

src/android/camera_stream.cpp

@@ -96,12 +96,15 @@ int CameraStream::configure()
 }
 
 int CameraStream::process(const libcamera::FrameBuffer &source,
-			  MappedCamera3Buffer *dest, CameraMetadata *metadata)
+			  MappedCamera3Buffer *dest,
+			  const CameraMetadata &requestMetadata,
+			  CameraMetadata *resultMetadata)
 {
 	if (!postProcessor_)
 		return 0;
 
-	return postProcessor_->process(source, dest->maps()[0], metadata);
+	return postProcessor_->process(source, dest->maps()[0],
+				       requestMetadata, resultMetadata);
 }
 
 FrameBuffer *CameraStream::getBuffer()

src/android/camera_stream.h

@@ -119,7 +119,9 @@ public:
 
 	int configure();
 	int process(const libcamera::FrameBuffer &source,
-		    MappedCamera3Buffer *dest, CameraMetadata *metadata);
+		    MappedCamera3Buffer *dest,
+		    const CameraMetadata &requestMetadata,
+		    CameraMetadata *resultMetadata);
 	libcamera::FrameBuffer *getBuffer();
 	void putBuffer(libcamera::FrameBuffer *buffer);
 

src/android/jpeg/post_processor_jpeg.cpp

@@ -83,17 +83,26 @@ void PostProcessorJpeg::generateThumbnail(const FrameBuffer &source,
 
 int PostProcessorJpeg::process(const FrameBuffer &source,
 			       Span<uint8_t> destination,
-			       CameraMetadata *metadata)
+			       const CameraMetadata &requestMetadata,
+			       CameraMetadata *resultMetadata)
 {
 	if (!encoder_)
 		return 0;
 
+	camera_metadata_ro_entry_t entry;
+	int ret;
+
 	/* 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.setMake(cameraDevice_->maker());
+	exif.setModel(cameraDevice_->model());
+
+	ret = requestMetadata.getEntry(ANDROID_JPEG_ORIENTATION, &entry);
+
+	const uint32_t jpegOrientation = ret ? *entry.data.i32 : 0;
+	resultMetadata->addEntry(ANDROID_JPEG_ORIENTATION, &jpegOrientation, 1);
+	exif.setOrientation(jpegOrientation);
+
 	exif.setSize(streamSize_);
 	/*
 	 * We set the frame's EXIF timestamp as the time of encode.
@@ -102,6 +111,39 @@ int PostProcessorJpeg::process(const FrameBuffer &source,
 	 */
 	exif.setTimestamp(std::time(nullptr), 0ms);
 
+	/* \todo Get this information from libcamera::Request::metadata */
+	exif.setExposureTime(0);
+	ret = requestMetadata.getEntry(ANDROID_LENS_APERTURE, &entry);
+	if (ret)
+		exif.setAperture(*entry.data.f);
+	exif.setISO(100);
+	exif.setFlash(Exif::Flash::FlashNotPresent);
+	exif.setWhiteBalance(Exif::WhiteBalance::Auto);
+
+	exif.setFocalLength(1.0);
+
+	ret = requestMetadata.getEntry(ANDROID_JPEG_GPS_TIMESTAMP, &entry);
+	if (ret) {
+		exif.setGPSDateTimestamp(*entry.data.i64);
+		resultMetadata->addEntry(ANDROID_JPEG_GPS_TIMESTAMP,
+					 entry.data.i64, 1);
+	}
+
+	ret = requestMetadata.getEntry(ANDROID_JPEG_GPS_COORDINATES, &entry);
+	if (ret) {
+		exif.setGPSLocation(entry.data.d);
+		resultMetadata->addEntry(ANDROID_JPEG_GPS_COORDINATES,
+					 entry.data.d, 3);
+	}
+
+	ret = requestMetadata.getEntry(ANDROID_JPEG_GPS_PROCESSING_METHOD, &entry);
+	if (ret) {
+		std::string method(entry.data.u8, entry.data.u8 + entry.count);
+		exif.setGPSMethod(method);
+		resultMetadata->addEntry(ANDROID_JPEG_GPS_PROCESSING_METHOD,
+					 entry.data.u8, entry.count);
+	}
+
 	std::vector<unsigned char> thumbnail;
 	generateThumbnail(source, &thumbnail);
 	if (!thumbnail.empty())
@@ -136,13 +178,12 @@ int PostProcessorJpeg::process(const FrameBuffer &source,
 	blob->jpeg_size = jpeg_size;
 
 	/* Update the JPEG result Metadata. */
-	metadata->addEntry(ANDROID_JPEG_SIZE, &jpeg_size, 1);
+	resultMetadata->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);
+	/* \todo Configure JPEG encoder with this */
+	ret = requestMetadata.getEntry(ANDROID_JPEG_QUALITY, &entry);
+	const uint8_t jpegQuality = ret ? *entry.data.u8 : 95;
+	resultMetadata->addEntry(ANDROID_JPEG_QUALITY, &jpegQuality, 1);
 
 	return 0;
 }

src/android/jpeg/post_processor_jpeg.h

@@ -26,7 +26,8 @@ public:
 		      const libcamera::StreamConfiguration &outcfg) override;
 	int process(const libcamera::FrameBuffer &source,
 		    libcamera::Span<uint8_t> destination,
-		    CameraMetadata *metadata) override;
+		    const CameraMetadata &requestMetadata,
+		    CameraMetadata *resultMetadata) override;
 
 private:
 	void generateThumbnail(const libcamera::FrameBuffer &source,

src/android/post_processor.h

@@ -22,7 +22,8 @@ public:
 			      const libcamera::StreamConfiguration &outCfg) = 0;
 	virtual int process(const libcamera::FrameBuffer &source,
 			    libcamera::Span<uint8_t> destination,
-			    CameraMetadata *metadata) = 0;
+			    const CameraMetadata &requestMetadata,
+			    CameraMetadata *resultMetadata) = 0;
 };
 
 #endif /* __ANDROID_POST_PROCESSOR_H__ */