android: libyuv: Introduce PostProcessorYuv

This adds PostProcessorYuv. It supports NV12 buffer scaling
using libyuv.

Signed-off-by: Hirokazu Honda <hiroh@chromium.org>
Reviewed-by: Jacopo Mondi <jacopo@jmondi.org>
Reviewed-by: Laurent Pinchart <laurent.pinchart@ideasonboard.com>
Signed-off-by: Laurent Pinchart <laurent.pinchart@ideasonboard.com>

1 files changed, 42 insertions, 0 deletions

diff --git a/src/android/yuv/post_processor_yuv.h b/src/android/yuv/post_processor_yuv.h
new file mode 100644
index 00000000..c58b4cf7
--- /dev/null
+++ b/src/android/yuv/post_processor_yuv.h
@@ -0,0 +1,42 @@
+/* SPDX-License-Identifier: LGPL-2.1-or-later */
+/*
+ * Copyright (C) 2021, Google Inc.
+ *
+ * post_processor_yuv.h - Post Processor using libyuv
+ */
+#ifndef __ANDROID_POST_PROCESSOR_YUV_H__
+#define __ANDROID_POST_PROCESSOR_YUV_H__
+
+#include "../post_processor.h"
+
+#include <libcamera/geometry.h>
+
+class CameraDevice;
+
+class PostProcessorYuv : public PostProcessor
+{
+public:
+	PostProcessorYuv() = default;
+
+	int configure(const libcamera::StreamConfiguration &incfg,
+		      const libcamera::StreamConfiguration &outcfg) override;
+	int process(const libcamera::FrameBuffer &source,
+		    libcamera::MappedBuffer *destination,
+		    const CameraMetadata &requestMetadata,
+		    CameraMetadata *metadata) override;
+
+private:
+	bool isValidBuffers(const libcamera::FrameBuffer &source,
+			    const libcamera::MappedBuffer &destination) const;
+	void calculateLengths(const libcamera::StreamConfiguration &inCfg,
+			      const libcamera::StreamConfiguration &outCfg);
+
+	libcamera::Size sourceSize_;
+	libcamera::Size destinationSize_;
+	unsigned int sourceLength_[2] = {};
+	unsigned int destinationLength_[2] = {};
+	unsigned int sourceStride_[2] = {};
+	unsigned int destinationStride_[2] = {};
+};
+
+#endif /* __ANDROID_POST_PROCESSOR_YUV_H__ */