Implement basic support for CEF.

[nageru] / cef_capture.h

diff --git a/cef_capture.h b/cef_capture.h
new file mode 100644 (file)
index 0000000..dc74b30
--- /dev/null
+++ b/cef_capture.h
@@ -0,0 +1,165 @@
+#ifndef _CEF_CAPTURE_H
+#define _CEF_CAPTURE_H 1
+
+// CEFCapture represents a single CEF virtual capture card (usually, there would only
+// be one globally), similar to FFmpegCapture. It owns a CefBrowser, which calls
+// OnPaint() back every time it has a frame. Note that it runs asynchronously;
+// there's no way to get frame-perfect sync.
+
+#include <assert.h>
+#include <stdint.h>
+
+#include <condition_variable>
+#include <functional>
+#include <map>
+#include <memory>
+#include <mutex>
+#include <set>
+#include <string>
+#include <thread>
+
+#undef CHECK
+#include <cef_client.h>
+#include <cef_base.h>
+#include <cef_render_handler.h>
+
+#include <bmusb/bmusb.h>
+
+class CefBrowser;
+class CefRect;
+class CEFCapture;
+
+// A helper class for CEFCapture to proxy information to CEF, without becoming
+// CEF-refcounted itself.
+class NageruCEFClient : public CefClient, public CefRenderHandler
+{
+public:
+       NageruCEFClient(int width, int height, CEFCapture *parent)
+               : width(width), height(height), parent(parent) {}
+
+       CefRefPtr<CefRenderHandler> GetRenderHandler() override
+       {
+               return this;
+       }
+
+       void OnPaint(CefRefPtr<CefBrowser> browser, PaintElementType type, const RectList &dirtyRects, const void *buffer, int width, int height) override;
+
+       bool GetViewRect(CefRefPtr<CefBrowser> browser, CefRect &rect);
+
+private:
+       int width, height;
+       CEFCapture *parent;
+
+       IMPLEMENT_REFCOUNTING(NageruCEFClient);
+};
+
+class CEFCapture : public bmusb::CaptureInterface
+{
+public:
+       CEFCapture(const std::string &url, unsigned width, unsigned height);
+       ~CEFCapture();
+
+       void set_card_index(int card_index)
+       {
+               this->card_index = card_index;
+       }
+
+       int get_card_index() const
+       {
+               return card_index;
+       }
+
+       void OnPaint(const void *buffer, int width, int height);
+
+       // CaptureInterface.
+       void set_video_frame_allocator(bmusb::FrameAllocator *allocator) override
+       {
+               video_frame_allocator = allocator;
+               if (owned_video_frame_allocator.get() != allocator) {
+                       owned_video_frame_allocator.reset();
+               }
+       }
+
+       bmusb::FrameAllocator *get_video_frame_allocator() override
+       {
+               return video_frame_allocator;
+       }
+
+       // Does not take ownership.
+       void set_audio_frame_allocator(bmusb::FrameAllocator *allocator) override
+       {
+       }
+
+       bmusb::FrameAllocator *get_audio_frame_allocator() override
+       {
+               return nullptr;
+       }
+
+       void set_frame_callback(bmusb::frame_callback_t callback) override
+       {
+               frame_callback = callback;
+       }
+
+       void set_dequeue_thread_callbacks(std::function<void()> init, std::function<void()> cleanup) override
+       {
+               dequeue_init_callback = init;
+               dequeue_cleanup_callback = cleanup;
+               has_dequeue_callbacks = true;
+       }
+
+       std::string get_description() const override
+       {
+               return description;
+       }
+
+       void configure_card() override;
+       void start_bm_capture() override;
+       void stop_dequeue_thread() override;
+       bool get_disconnected() const override { return false; }
+
+       std::set<bmusb::PixelFormat> get_available_pixel_formats() const override
+       {
+               return std::set<bmusb::PixelFormat>{ bmusb::PixelFormat_8BitBGRA };
+       }
+
+       void set_pixel_format(bmusb::PixelFormat pixel_format) override
+       {
+               assert(pixel_format == bmusb::PixelFormat_8BitBGRA);
+       }
+
+       bmusb::PixelFormat get_current_pixel_format() const
+       {
+               return bmusb::PixelFormat_8BitBGRA;
+       }
+
+       std::map<uint32_t, bmusb::VideoMode> get_available_video_modes() const override;
+       void set_video_mode(uint32_t video_mode_id) override;
+       uint32_t get_current_video_mode() const override { return 0; }
+
+       std::map<uint32_t, std::string> get_available_video_inputs() const override;
+       void set_video_input(uint32_t video_input_id) override;
+       uint32_t get_current_video_input() const override { return 0; }
+
+       std::map<uint32_t, std::string> get_available_audio_inputs() const override;
+       void set_audio_input(uint32_t audio_input_id) override;
+       uint32_t get_current_audio_input() const override { return 0; }
+
+private:
+       CefRefPtr<NageruCEFClient> cef_client;
+       unsigned width, height;
+       int card_index = -1;
+
+       bool has_dequeue_callbacks = false;
+       std::function<void()> dequeue_init_callback = nullptr;
+       std::function<void()> dequeue_cleanup_callback = nullptr;
+
+       bmusb::FrameAllocator *video_frame_allocator = nullptr;
+       std::unique_ptr<bmusb::FrameAllocator> owned_video_frame_allocator;
+       bmusb::frame_callback_t frame_callback = nullptr;
+
+       std::string description, start_url;
+
+       int timecode = 0;
+};
+
+#endif  // !defined(_CEF_CAPTURE_H)