1 files changed, 125 insertions, 0 deletions
diff --git a/include/libcamera/internal/converter/converter_v4l2_m2m.h b/include/libcamera/internal/converter/converter_v4l2_m2m.h
new file mode 100644
index 00000000..0ad7bf7f
--- /dev/null
+++ b/include/libcamera/internal/converter/converter_v4l2_m2m.h
@@ -0,0 +1,125 @@
+/* SPDX-License-Identifier: LGPL-2.1-or-later */
+/*
+ * Copyright (C) 2020, Laurent Pinchart
+ * Copyright 2022 NXP
+ *
+ * V4l2 M2M Format converter interface
+ */
+
+#pragma once
+
+#include <functional>
+#include <map>
+#include <memory>
+#include <string>
+#include <tuple>
+#include <vector>
+
+#include <libcamera/base/log.h>
+#include <libcamera/base/signal.h>
+
+#include <libcamera/pixel_format.h>
+
+#include "libcamera/internal/converter.h"
+
+namespace libcamera {
+
+class FrameBuffer;
+class MediaDevice;
+class Size;
+class SizeRange;
+class Stream;
+struct StreamConfiguration;
+class Rectangle;
+class V4L2M2MDevice;
+
+class V4L2M2MConverter : public Converter
+{
+public:
+	V4L2M2MConverter(MediaDevice *media);
+
+	int loadConfiguration([[maybe_unused]] const std::string &filename) override { return 0; }
+	bool isValid() const override { return m2m_ != nullptr; }
+
+	std::vector<PixelFormat> formats(PixelFormat input) override;
+	SizeRange sizes(const Size &input) override;
+
+	std::tuple<unsigned int, unsigned int>
+	strideAndFrameSize(const PixelFormat &pixelFormat, const Size &size) override;
+
+	Size adjustInputSize(const PixelFormat &pixFmt,
+			     const Size &size, Alignment align = Alignment::Down) override;
+	Size adjustOutputSize(const PixelFormat &pixFmt,
+			      const Size &size, Alignment align = Alignment::Down) override;
+
+	int configure(const StreamConfiguration &inputCfg,
+		      const std::vector<std::reference_wrapper<StreamConfiguration>>
+		      &outputCfg) override;
+	bool isConfigured(const Stream *stream) const override;
+	int exportBuffers(const Stream *stream, unsigned int count,
+			  std::vector<std::unique_ptr<FrameBuffer>> *buffers) override;
+
+	int start() override;
+	void stop() override;
+
+	int validateOutput(StreamConfiguration *cfg, bool *adjusted,
+			   Alignment align = Alignment::Down) override;
+
+	int queueBuffers(FrameBuffer *input,
+			 const std::map<const Stream *, FrameBuffer *> &outputs) override;
+
+	int setInputCrop(const Stream *stream, Rectangle *rect) override;
+	std::pair<Rectangle, Rectangle> inputCropBounds() override { return inputCropBounds_; }
+	std::pair<Rectangle, Rectangle> inputCropBounds(const Stream *stream) override;
+
+private:
+	class V4L2M2MStream : protected Loggable
+	{
+	public:
+		V4L2M2MStream(V4L2M2MConverter *converter, const Stream *stream);
+
+		bool isValid() const { return m2m_ != nullptr; }
+
+		int configure(const StreamConfiguration &inputCfg,
+			      const StreamConfiguration &outputCfg);
+		int exportBuffers(unsigned int count,
+				  std::vector<std::unique_ptr<FrameBuffer>> *buffers);
+
+		int start();
+		void stop();
+
+		int queueBuffers(FrameBuffer *input, FrameBuffer *output);
+
+		int setInputSelection(unsigned int target, Rectangle *rect);
+		int getInputSelection(unsigned int target, Rectangle *rect);
+
+		std::pair<Rectangle, Rectangle> inputCropBounds();
+
+	protected:
+		std::string logPrefix() const override;
+
+	private:
+		void captureBufferReady(FrameBuffer *buffer);
+		void outputBufferReady(FrameBuffer *buffer);
+
+		V4L2M2MConverter *converter_;
+		const Stream *stream_;
+		std::unique_ptr<V4L2M2MDevice> m2m_;
+
+		unsigned int inputBufferCount_;
+		unsigned int outputBufferCount_;
+
+		std::pair<Rectangle, Rectangle> inputCropBounds_;
+	};
+
+	Size adjustSizes(const Size &size, const std::vector<SizeRange> &ranges,
+			 Alignment align);
+
+	std::unique_ptr<V4L2M2MDevice> m2m_;
+
+	std::map<const Stream *, std::unique_ptr<V4L2M2MStream>> streams_;
+	std::map<FrameBuffer *, unsigned int> queue_;
+	std::pair<Rectangle, Rectangle> inputCropBounds_;
+};
+
+} /* namespace libcamera */