android: jpeg: Port to PostProcessor interface

Port the CameraStream's JPEG-encoding bits to PostProcessorJpeg.
This encapsulates the encoder and EXIF generation code into the
PostProcessorJpeg layer and removes these specifics related to JPEG,
from the CameraStream itself.

Signed-off-by: Umang Jain <email@uajain.com>
Tested-by: Kieran Bingham <kieran.bingham@ideasonboard.com>
Reviewed-by: Kieran Bingham <kieran.bingham@ideasonboard.com>
Reviewed-by: Laurent Pinchart <laurent.pinchart@ideasonboard.com>
Signed-off-by: Kieran Bingham <kieran.bingham@ideasonboard.com>
Change-Id: Id9e6e9b2bec83493a90e5e126298a2bb2ed2232a

src/android/camera_device.cpp

@@ -7,6 +7,7 @@
 
 #include "camera_device.h"
 #include "camera_ops.h"
+#include "post_processor.h"
 
 #include <sys/mman.h>
 #include <tuple>

src/android/camera_stream.cpp

@@ -9,9 +9,9 @@
 
 #include "camera_device.h"
 #include "camera_metadata.h"
-#include "jpeg/encoder.h"
-#include "jpeg/encoder_libjpeg.h"
-#include "jpeg/exif.h"
+#include "jpeg/post_processor_jpeg.h"
+
+#include <libcamera/formats.h>
 
 using namespace libcamera;
 
@@ -45,8 +45,15 @@ CameraStream::CameraStream(CameraDevice *cameraDevice, Type type,
 {
 	config_ = cameraDevice_->cameraConfiguration();
 
-	if (type_ == Type::Internal || type_ == Type::Mapped)
-		encoder_ = std::make_unique<EncoderLibJpeg>();
+	if (type_ == Type::Internal || type_ == Type::Mapped) {
+		/*
+		 * \todo There might be multiple post-processors. The logic
+		 * which should be instantiated here, is deferred for the
+		 * future. For now, we only have PostProcessorJpeg and that
+		 * is what we instantiate here.
+		 */
+		postProcessor_ = std::make_unique<PostProcessorJpeg>(cameraDevice_);
+	}
 
 	if (type == Type::Internal) {
 		allocator_ = std::make_unique<FrameBufferAllocator>(cameraDevice_->camera());
@@ -66,8 +73,10 @@ Stream *CameraStream::stream() const
 
 int CameraStream::configure()
 {
-	if (encoder_) {
-		int ret = encoder_->configure(configuration());
+	if (postProcessor_) {
+		StreamConfiguration output = configuration();
+		output.pixelFormat = formats::MJPEG;
+		int ret = postProcessor_->configure(configuration(), output);
 		if (ret)
 			return ret;
 	}
@@ -90,60 +99,10 @@ int CameraStream::configure()
 int CameraStream::process(const libcamera::FrameBuffer &source,
 			  MappedCamera3Buffer *dest, CameraMetadata *metadata)
 {
-	if (!encoder_)
+	if (!postProcessor_)
 		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(configuration().size);
-	/*
-	 * 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(HAL, Error) << "Failed to generate valid EXIF data";
-
-	int jpeg_size = encoder_->encode(&source, dest->maps()[0], exif.data());
-	if (jpeg_size < 0) {
-		LOG(HAL, 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 = dest->maps()[0].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;
+	return postProcessor_->process(&source, dest->maps()[0], metadata);
 }
 
 FrameBuffer *CameraStream::getBuffer()

src/android/camera_stream.h

@@ -19,10 +19,10 @@
 #include <libcamera/geometry.h>
 #include <libcamera/pixel_format.h>
 
-class Encoder;
 class CameraDevice;
 class CameraMetadata;
 class MappedCamera3Buffer;
+class PostProcessor;
 
 class CameraStream
 {
@@ -130,7 +130,6 @@ private:
 	camera3_stream_t *camera3Stream_;
 	unsigned int index_;
 
-	std::unique_ptr<Encoder> encoder_;
 	std::unique_ptr<libcamera::FrameBufferAllocator> allocator_;
 	std::vector<libcamera::FrameBuffer *> buffers_;
 	/*
@@ -138,6 +137,7 @@ private:
 	 * an std::vector in CameraDevice.
 	 */
 	std::unique_ptr<std::mutex> mutex_;
+	std::unique_ptr<PostProcessor> postProcessor_;
 };
 
 #endif /* __ANDROID_CAMERA_STREAM__ */

src/android/jpeg/encoder_libjpeg.cpp

@@ -25,7 +25,7 @@
 
 using namespace libcamera;
 
-LOG_DEFINE_CATEGORY(JPEG)
+LOG_DECLARE_CATEGORY(JPEG);
 
 namespace {
 

src/android/jpeg/post_processor_jpeg.cpp

@@ -0,0 +1,105 @@
+/* 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;
+}

src/android/jpeg/post_processor_jpeg.h

@@ -0,0 +1,36 @@
+/* SPDX-License-Identifier: LGPL-2.1-or-later */
+/*
+ * Copyright (C) 2020, Google Inc.
+ *
+ * post_processor_jpeg.h - JPEG Post Processor
+ */
+#ifndef __ANDROID_POST_PROCESSOR_JPEG_H__
+#define __ANDROID_POST_PROCESSOR_JPEG_H__
+
+#include "../post_processor.h"
+
+#include <libcamera/geometry.h>
+
+#include "libcamera/internal/buffer.h"
+
+class Encoder;
+class CameraDevice;
+
+class PostProcessorJpeg : public PostProcessor
+{
+public:
+	PostProcessorJpeg(CameraDevice *device);
+
+	int configure(const libcamera::StreamConfiguration &incfg,
+		      const libcamera::StreamConfiguration &outcfg) override;
+	int process(const libcamera::FrameBuffer *source,
+		    const libcamera::Span<uint8_t> &destination,
+		    CameraMetadata *metadata) override;
+
+private:
+	CameraDevice *cameraDevice_;
+	std::unique_ptr<Encoder> encoder_;
+	libcamera::Size streamSize_;
+};
+
+#endif /* __ANDROID_POST_PROCESSOR_JPEG_H__ */

src/android/meson.build

@@ -24,6 +24,7 @@ android_hal_sources = files([
     'camera_worker.cpp',
     'jpeg/encoder_libjpeg.cpp',
     'jpeg/exif.cpp',
+    'jpeg/post_processor_jpeg.cpp',
 ])
 
 android_camera_metadata_sources = files([