git.sesse.net Git - nageru/blob - cef_capture.h

   1 #ifndef _CEF_CAPTURE_H
   2 #define _CEF_CAPTURE_H 1
   3
   4 // CEFCapture represents a single CEF virtual capture card (usually, there would only
   5 // be one globally), similar to FFmpegCapture. It owns a CefBrowser, which calls
   6 // OnPaint() back every time it has a frame. Note that it runs asynchronously;
   7 // there's no way to get frame-perfect sync.
   8
   9 #include <assert.h>
  10 #include <stdint.h>
  11
  12 #include <condition_variable>
  13 #include <functional>
  14 #include <map>
  15 #include <memory>
  16 #include <mutex>
  17 #include <set>
  18 #include <string>
  19 #include <thread>
  20
  21 #undef CHECK
  22 #include <cef_client.h>
  23 #include <cef_base.h>
  24 #include <cef_render_handler.h>
  25
  26 #include <bmusb/bmusb.h>
  27
  28 class CefBrowser;
  29 class CefRect;
  30 class CEFCapture;
  31
  32 // A helper class for CEFCapture to proxy information to CEF, without becoming
  33 // CEF-refcounted itself.
  34 class NageruCEFClient : public CefClient, public CefRenderHandler
  35 {
  36 public:
  37         NageruCEFClient(int width, int height, CEFCapture *parent)
  38                 : width(width), height(height), parent(parent) {}
  39
  40         CefRefPtr<CefRenderHandler> GetRenderHandler() override
  41         {
  42                 return this;
  43         }
  44
  45         void OnPaint(CefRefPtr<CefBrowser> browser, PaintElementType type, const RectList &dirtyRects, const void *buffer, int width, int height) override;
  46
  47         bool GetViewRect(CefRefPtr<CefBrowser> browser, CefRect &rect);
  48
  49 private:
  50         int width, height;
  51         CEFCapture *parent;
  52
  53         IMPLEMENT_REFCOUNTING(NageruCEFClient);
  54 };
  55
  56 class CEFCapture : public bmusb::CaptureInterface
  57 {
  58 public:
  59         CEFCapture(const std::string &url, unsigned width, unsigned height);
  60         ~CEFCapture();
  61
  62         void set_card_index(int card_index)
  63         {
  64                 this->card_index = card_index;
  65         }
  66
  67         int get_card_index() const
  68         {
  69                 return card_index;
  70         }
  71
  72         void set_url(const std::string &url);
  73         void reload();
  74
  75         void OnPaint(const void *buffer, int width, int height);
  76
  77         // CaptureInterface.
  78         void set_video_frame_allocator(bmusb::FrameAllocator *allocator) override
  79         {
  80                 video_frame_allocator = allocator;
  81                 if (owned_video_frame_allocator.get() != allocator) {
  82                         owned_video_frame_allocator.reset();
  83                 }
  84         }
  85
  86         bmusb::FrameAllocator *get_video_frame_allocator() override
  87         {
  88                 return video_frame_allocator;
  89         }
  90
  91         // Does not take ownership.
  92         void set_audio_frame_allocator(bmusb::FrameAllocator *allocator) override
  93         {
  94         }
  95
  96         bmusb::FrameAllocator *get_audio_frame_allocator() override
  97         {
  98                 return nullptr;
  99         }
 100
 101         void set_frame_callback(bmusb::frame_callback_t callback) override
 102         {
 103                 frame_callback = callback;
 104         }
 105
 106         void set_dequeue_thread_callbacks(std::function<void()> init, std::function<void()> cleanup) override
 107         {
 108                 dequeue_init_callback = init;
 109                 dequeue_cleanup_callback = cleanup;
 110                 has_dequeue_callbacks = true;
 111         }
 112
 113         std::string get_description() const override
 114         {
 115                 return description;
 116         }
 117
 118         void configure_card() override;
 119         void start_bm_capture() override;
 120         void stop_dequeue_thread() override;
 121         bool get_disconnected() const override { return false; }
 122
 123         std::set<bmusb::PixelFormat> get_available_pixel_formats() const override
 124         {
 125                 return std::set<bmusb::PixelFormat>{ bmusb::PixelFormat_8BitBGRA };
 126         }
 127
 128         void set_pixel_format(bmusb::PixelFormat pixel_format) override
 129         {
 130                 assert(pixel_format == bmusb::PixelFormat_8BitBGRA);
 131         }
 132
 133         bmusb::PixelFormat get_current_pixel_format() const
 134         {
 135                 return bmusb::PixelFormat_8BitBGRA;
 136         }
 137
 138         std::map<uint32_t, bmusb::VideoMode> get_available_video_modes() const override;
 139         void set_video_mode(uint32_t video_mode_id) override;
 140         uint32_t get_current_video_mode() const override { return 0; }
 141
 142         std::map<uint32_t, std::string> get_available_video_inputs() const override;
 143         void set_video_input(uint32_t video_input_id) override;
 144         uint32_t get_current_video_input() const override { return 0; }
 145
 146         std::map<uint32_t, std::string> get_available_audio_inputs() const override;
 147         void set_audio_input(uint32_t audio_input_id) override;
 148         uint32_t get_current_audio_input() const override { return 0; }
 149
 150 private:
 151         void post_to_cef_ui_thread(std::function<void()> &&func);
 152
 153         CefRefPtr<NageruCEFClient> cef_client;
 154         unsigned width, height;
 155         int card_index = -1;
 156
 157         bool has_dequeue_callbacks = false;
 158         std::function<void()> dequeue_init_callback = nullptr;
 159         std::function<void()> dequeue_cleanup_callback = nullptr;
 160
 161         bmusb::FrameAllocator *video_frame_allocator = nullptr;
 162         std::unique_ptr<bmusb::FrameAllocator> owned_video_frame_allocator;
 163         bmusb::frame_callback_t frame_callback = nullptr;
 164
 165         std::string description, start_url;
 166
 167         std::mutex browser_mutex;
 168         CefRefPtr<CefBrowser> browser;  // Under <browser_mutex>.
 169
 170         // Tasks waiting for <browser> to get ready. Under <browser_mutex>.
 171         std::vector<std::function<void()>> deferred_tasks;
 172
 173         int timecode = 0;
 174 };
 175
 176 #endif  // !defined(_CEF_CAPTURE_H)