android: jpeg: Set thumbnail and JPEG quality based on request

Set the thumbnail quality and the JPEG quality based on the android
request metadata.

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/jpeg/encoder.h

@@ -19,7 +19,8 @@ public:
 	virtual int configure(const libcamera::StreamConfiguration &cfg) = 0;
 	virtual int encode(const libcamera::FrameBuffer &source,
 			   libcamera::Span<uint8_t> destination,
-			   libcamera::Span<const uint8_t> exifData) = 0;
+			   libcamera::Span<const uint8_t> exifData,
+			   unsigned int quality) = 0;
 };
 
 #endif /* __ANDROID_JPEG_ENCODER_H__ */

src/android/jpeg/encoder_libjpeg.cpp

@@ -68,7 +68,6 @@ const struct JPEGPixelFormatInfo &findPixelInfo(const PixelFormat &format)
 } /* namespace */
 
 EncoderLibJpeg::EncoderLibJpeg()
-	: quality_(95)
 {
 	/* \todo Expand error handling coverage with a custom handler. */
 	compress_.err = jpeg_std_error(&jerr_);
@@ -94,7 +93,6 @@ int EncoderLibJpeg::configure(const StreamConfiguration &cfg)
 	compress_.input_components = info.colorSpace == JCS_GRAYSCALE ? 1 : 3;
 
 	jpeg_set_defaults(&compress_);
-	jpeg_set_quality(&compress_, quality_, TRUE);
 
 	pixelFormatInfo_ = &info.pixelFormatInfo;
 
@@ -180,7 +178,7 @@ void EncoderLibJpeg::compressNV(Span<const uint8_t> frame)
 }
 
 int EncoderLibJpeg::encode(const FrameBuffer &source, Span<uint8_t> dest,
-			   Span<const uint8_t> exifData)
+			   Span<const uint8_t> exifData, unsigned int quality)
 {
 	MappedFrameBuffer frame(&source, PROT_READ);
 	if (!frame.isValid()) {
@@ -189,15 +187,17 @@ int EncoderLibJpeg::encode(const FrameBuffer &source, Span<uint8_t> dest,
 		return frame.error();
 	}
 
-	return encode(frame.maps()[0], dest, exifData);
+	return encode(frame.maps()[0], dest, exifData, quality);
 }
 
 int EncoderLibJpeg::encode(Span<const uint8_t> src, Span<uint8_t> dest,
-			   Span<const uint8_t> exifData)
+			   Span<const uint8_t> exifData, unsigned int quality)
 {
 	unsigned char *destination = dest.data();
 	unsigned long size = dest.size();
 
+	jpeg_set_quality(&compress_, quality, TRUE);
+
 	/*
 	 * The jpeg_mem_dest will reallocate if the required size is not
 	 * sufficient. That means the output won't be written to the correct

src/android/jpeg/encoder_libjpeg.h

@@ -23,10 +23,12 @@ public:
 	int configure(const libcamera::StreamConfiguration &cfg) override;
 	int encode(const libcamera::FrameBuffer &source,
 		   libcamera::Span<uint8_t> destination,
-		   libcamera::Span<const uint8_t> exifData) override;
+		   libcamera::Span<const uint8_t> exifData,
+		   unsigned int quality) override;
 	int encode(libcamera::Span<const uint8_t> source,
 		   libcamera::Span<uint8_t> destination,
-		   libcamera::Span<const uint8_t> exifData);
+		   libcamera::Span<const uint8_t> exifData,
+		   unsigned int quality);
 
 private:
 	void compressRGB(libcamera::Span<const uint8_t> frame);
@@ -35,8 +37,6 @@ private:
 	struct jpeg_compress_struct compress_;
 	struct jpeg_error_mgr jerr_;
 
-	unsigned int quality_;
-
 	const libcamera::PixelFormatInfo *pixelFormatInfo_;
 
 	bool nv_;

src/android/jpeg/post_processor_jpeg.cpp

@@ -52,6 +52,7 @@ int PostProcessorJpeg::configure(const StreamConfiguration &inCfg,
 
 void PostProcessorJpeg::generateThumbnail(const FrameBuffer &source,
 					  const Size &targetSize,
+					  unsigned int quality,
 					  std::vector<unsigned char> *thumbnail)
 {
 	/* Stores the raw scaled-down thumbnail bytes. */
@@ -72,7 +73,7 @@ void PostProcessorJpeg::generateThumbnail(const FrameBuffer &source,
 		thumbnail->resize(rawThumbnail.size());
 
 		int jpeg_size = thumbnailEncoder_.encode(rawThumbnail,
-							 *thumbnail, {});
+							 *thumbnail, {}, quality);
 		thumbnail->resize(jpeg_size);
 
 		LOG(JPEG, Debug)
@@ -135,20 +136,18 @@ int PostProcessorJpeg::process(const FrameBuffer &source,
 		Size thumbnailSize = { static_cast<uint32_t>(data[0]),
 				       static_cast<uint32_t>(data[1]) };
 
+		ret = requestMetadata.getEntry(ANDROID_JPEG_THUMBNAIL_QUALITY, &entry);
+		uint8_t quality = ret ? *entry.data.u8 : 95;
+		resultMetadata->addEntry(ANDROID_JPEG_THUMBNAIL_QUALITY, &quality, 1);
+
 		if (thumbnailSize != Size(0, 0)) {
 			std::vector<unsigned char> thumbnail;
-			generateThumbnail(source, thumbnailSize, &thumbnail);
+			generateThumbnail(source, thumbnailSize, quality, &thumbnail);
 			if (!thumbnail.empty())
 				exif.setThumbnail(thumbnail, Exif::Compression::JPEG);
 		}
 
 		resultMetadata->addEntry(ANDROID_JPEG_THUMBNAIL_SIZE, data, 2);
-
-		/* \todo Use this quality as a parameter to the encoder */
-		ret = requestMetadata.getEntry(ANDROID_JPEG_THUMBNAIL_QUALITY, &entry);
-		if (ret)
-			resultMetadata->addEntry(ANDROID_JPEG_THUMBNAIL_QUALITY,
-						 entry.data.u8, 1);
 	}
 
 	ret = requestMetadata.getEntry(ANDROID_JPEG_GPS_COORDINATES, &entry);
@@ -169,7 +168,11 @@ int PostProcessorJpeg::process(const FrameBuffer &source,
 	if (exif.generate() != 0)
 		LOG(JPEG, Error) << "Failed to generate valid EXIF data";
 
-	int jpeg_size = encoder_->encode(source, destination, exif.data());
+	ret = requestMetadata.getEntry(ANDROID_JPEG_QUALITY, &entry);
+	const uint8_t quality = ret ? *entry.data.u8 : 95;
+	resultMetadata->addEntry(ANDROID_JPEG_QUALITY, &quality, 1);
+
+	int jpeg_size = encoder_->encode(source, destination, exif.data(), quality);
 	if (jpeg_size < 0) {
 		LOG(JPEG, Error) << "Failed to encode stream image";
 		return jpeg_size;
@@ -197,10 +200,5 @@ int PostProcessorJpeg::process(const FrameBuffer &source,
 	/* Update the JPEG result Metadata. */
 	resultMetadata->addEntry(ANDROID_JPEG_SIZE, &jpeg_size, 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

@@ -32,6 +32,7 @@ public:
 private:
 	void generateThumbnail(const libcamera::FrameBuffer &source,
 			       const libcamera::Size &targetSize,
+			       unsigned int quality,
 			       std::vector<unsigned char> *thumbnail);
 
 	CameraDevice *const cameraDevice_;