X-Git-Url: https://git.sesse.net/?a=blobdiff_plain;f=nageru%2Fv4l_output.h;fp=nageru%2Fv4l_output.h;h=b7686f6434e8f6e21927329731f9a28e76db0498;hb=dcb238eb81768be4021f01dc7102c6c73821d0c0;hp=0000000000000000000000000000000000000000;hpb=0aa4c2665980537a02b15f74acd32a207f67e520;p=nageru

diff --git a/nageru/v4l_output.h b/nageru/v4l_output.h
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+++ b/nageru/v4l_output.h
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+#ifndef _V4L_OUTPUT_H
+#define _V4L_OUTPUT_H 1
+
+// Video-only V4L2 output. The intended use-case is output into
+// v4l2loopback to get into videoconferencing or the likes:
+//
+//   sudo apt install v4l2loopback-dkms
+//   sudo modprobe v4l2loopback video_nr=2 card_label='Nageru loopback' exclusive_caps=1
+//   nageru --v4l2-output /dev/video2
+//
+// Start Nageru before any readers.
+//
+// Unlike DecklinkOutput, this output does not own the master clock;
+// it is entirely unsynchronized, and runs off of the normal master clock.
+// It comes in addition to any other output, and is not GUI-controlled.
+
+#include <stddef.h>
+#include <stdint.h>
+
+#include <memory>
+
+class V4LOutput {
+public:
+	V4LOutput(const char *device_path, unsigned width, unsigned height);
+	~V4LOutput();
+
+	// Expects NV12 data.
+	void send_frame(const uint8_t *data);
+
+private:
+	const unsigned width, height;
+	const size_t image_size_bytes;
+	std::unique_ptr<uint8_t[]> yuv420_buf;
+	int video_fd;
+};
+
+#endif  // !defined(_V4L_OUTPUT_H)