libcamera: pipeline: simple: Add simple format converter

The simple format converter supports V4L2 M2M devices that convert pixel
formats.

Signed-off-by: Laurent Pinchart <laurent.pinchart@ideasonboard.com>
Reviewed-by: Kieran Bingham <kieran.bingham@ideasonboard.com>
Reviewed-by: Niklas Söderlund <niklas.soderlund@ragnatech.se>

1 files changed, 60 insertions, 0 deletions

diff --git a/src/libcamera/pipeline/simple/converter.h b/src/libcamera/pipeline/simple/converter.h
new file mode 100644
index 00000000..a33071fa
--- /dev/null
+++ b/src/libcamera/pipeline/simple/converter.h
@@ -0,0 +1,60 @@
+/* SPDX-License-Identifier: LGPL-2.1-or-later */
+/*
+ * Copyright (C) 2020, Laurent Pinchart
+ *
+ * converter.h - Format converter for simple pipeline handler
+ */
+
+#ifndef __LIBCAMERA_PIPELINE_SIMPLE_CONVERTER_H__
+#define __LIBCAMERA_PIPELINE_SIMPLE_CONVERTER_H__
+
+#include <memory>
+#include <queue>
+#include <vector>
+
+#include <libcamera/pixelformats.h>
+#include <libcamera/signal.h>
+
+namespace libcamera {
+
+class FrameBuffer;
+class MediaDevice;
+struct Size;
+class V4L2M2MDevice;
+
+class SimpleConverter
+{
+public:
+	SimpleConverter(MediaDevice *media);
+	~SimpleConverter();
+
+	int open();
+	void close();
+
+	std::vector<PixelFormat> formats(PixelFormat input);
+
+	int configure(PixelFormat inputFormat, PixelFormat outputFormat,
+		      const Size &size);
+	int exportBuffers(unsigned int count,
+			  std::vector<std::unique_ptr<FrameBuffer>> *buffers);
+
+	int start(unsigned int count);
+	void stop();
+
+	int queueBuffers(FrameBuffer *input, FrameBuffer *output);
+
+	Signal<FrameBuffer *, FrameBuffer *> bufferReady;
+
+private:
+	void captureBufferReady(FrameBuffer *buffer);
+	void outputBufferReady(FrameBuffer *buffer);
+
+	V4L2M2MDevice *m2m_;
+
+	std::queue<FrameBuffer *> captureDoneQueue_;
+	std::queue<FrameBuffer *> outputDoneQueue_;
+};
+
+} /* namespace libcamera */
+
+#endif /* __LIBCAMERA_PIPELINE_SIMPLE_CONVERTER_H__ */