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
  74         void OnPaint(const void *buffer, int width, int height);
  75
  76         // CaptureInterface.
  77         void set_video_frame_allocator(bmusb::FrameAllocator *allocator) override
  78         {
  79                 video_frame_allocator = allocator;
  80                 if (owned_video_frame_allocator.get() != allocator) {
  81                         owned_video_frame_allocator.reset();
  82                 }
  83         }
  84
  85         bmusb::FrameAllocator *get_video_frame_allocator() override
  86         {
  87                 return video_frame_allocator;
  88         }
  89
  90         // Does not take ownership.
  91         void set_audio_frame_allocator(bmusb::FrameAllocator *allocator) override
  92         {
  93         }
  94
  95         bmusb::FrameAllocator *get_audio_frame_allocator() override
  96         {
  97                 return nullptr;
  98         }
  99
 100         void set_frame_callback(bmusb::frame_callback_t callback) override
 101         {
 102                 frame_callback = callback;
 103         }
 104
 105         void set_dequeue_thread_callbacks(std::function<void()> init, std::function<void()> cleanup) override
 106         {
 107                 dequeue_init_callback = init;
 108                 dequeue_cleanup_callback = cleanup;
 109                 has_dequeue_callbacks = true;
 110         }
 111
 112         std::string get_description() const override
 113         {
 114                 return description;
 115         }
 116
 117         void configure_card() override;
 118         void start_bm_capture() override;
 119         void stop_dequeue_thread() override;
 120         bool get_disconnected() const override { return false; }
 121
 122         std::set<bmusb::PixelFormat> get_available_pixel_formats() const override
 123         {
 124                 return std::set<bmusb::PixelFormat>{ bmusb::PixelFormat_8BitBGRA };
 125         }
 126
 127         void set_pixel_format(bmusb::PixelFormat pixel_format) override
 128         {
 129                 assert(pixel_format == bmusb::PixelFormat_8BitBGRA);
 130         }
 131
 132         bmusb::PixelFormat get_current_pixel_format() const
 133         {
 134                 return bmusb::PixelFormat_8BitBGRA;
 135         }
 136
 137         std::map<uint32_t, bmusb::VideoMode> get_available_video_modes() const override;
 138         void set_video_mode(uint32_t video_mode_id) override;
 139         uint32_t get_current_video_mode() const override { return 0; }
 140
 141         std::map<uint32_t, std::string> get_available_video_inputs() const override;
 142         void set_video_input(uint32_t video_input_id) override;
 143         uint32_t get_current_video_input() const override { return 0; }
 144
 145         std::map<uint32_t, std::string> get_available_audio_inputs() const override;
 146         void set_audio_input(uint32_t audio_input_id) override;
 147         uint32_t get_current_audio_input() const override { return 0; }
 148
 149 private:
 150         void post_to_cef_ui_thread(std::function<void()> &&func);
 151
 152         CefRefPtr<NageruCEFClient> cef_client;
 153         unsigned width, height;
 154         int card_index = -1;
 155
 156         bool has_dequeue_callbacks = false;
 157         std::function<void()> dequeue_init_callback = nullptr;
 158         std::function<void()> dequeue_cleanup_callback = nullptr;
 159
 160         bmusb::FrameAllocator *video_frame_allocator = nullptr;
 161         std::unique_ptr<bmusb::FrameAllocator> owned_video_frame_allocator;
 162         bmusb::frame_callback_t frame_callback = nullptr;
 163
 164         std::string description, start_url;
 165
 166         std::mutex browser_mutex;
 167         CefRefPtr<CefBrowser> browser;  // Under <browser_mutex>.
 168
 169         // Tasks waiting for <browser> to get ready. Under <browser_mutex>.
 170         std::vector<std::function<void()>> deferred_tasks;
 171
 172         int timecode = 0;
 173 };
 174
 175 #endif  // !defined(_CEF_CAPTURE_H)