big stream progress

- stream manager (with bare bones ui)
- debug video tap
- toxav progress
- toxav debug ui
- some default devices

src/debug_video_tap.hpp

@@ -0,0 +1,32 @@
+#pragma once
+
+#include <cstdint>
+#include <solanaceae/object_store/fwd.hpp>
+#include "./stream_manager.hpp"
+#include "./texture_uploader.hpp"
+
+// provides a sink and a small window displaying a SDLVideoFrame
+class DebugVideoTap {
+	ObjectStore2& _os;
+	StreamManager& _sm;
+	TextureUploaderI& _tu;
+
+	ObjectHandle _selected_src;
+	ObjectHandle _tap;
+
+	uint64_t _tex {0};
+	uint32_t _tex_w {0};
+	uint32_t _tex_h {0};
+
+	uint64_t _v_last_ts {0}; // ns
+	float _v_interval_avg {0.f}; // s
+
+	public:
+		DebugVideoTap(ObjectStore2& os, StreamManager& sm, TextureUploaderI& tu);
+		~DebugVideoTap(void);
+
+		float render(void);
+
+		void switchTo(ObjectHandle o);
+};
+