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

   1 #include <assert.h>
   2 #include <stdio.h>
   3 #include <string.h>
   4 #include <chrono>
   5 #include <memory>
   6 #include <string>
   7
   8 #include "cef_capture.h"
   9 #include "nageru_cef_app.h"
  10
  11 #undef CHECK
  12 #include <cef_app.h>
  13 #include <cef_browser.h>
  14 #include <cef_client.h>
  15
  16 #include "bmusb/bmusb.h"
  17
  18 using namespace std;
  19 using namespace std::chrono;
  20 using namespace bmusb;
  21
  22 extern CefRefPtr<NageruCefApp> cef_app;
  23
  24 CEFCapture::CEFCapture(const string &url, unsigned width, unsigned height)
  25         : cef_client(new NageruCEFClient(width, height, this)),
  26           width(width),
  27           height(height),
  28           start_url(url)
  29 {
  30         char buf[256];
  31         snprintf(buf, sizeof(buf), "CEF card %d", card_index + 1);
  32         description = buf;
  33 }
  34
  35 CEFCapture::~CEFCapture()
  36 {
  37         if (has_dequeue_callbacks) {
  38                 dequeue_cleanup_callback();
  39         }
  40 }
  41
  42 void CEFCapture::post_to_cef_ui_thread(std::function<void()> &&func, int64_t delay_ms)
  43 {
  44         lock_guard<recursive_mutex> lock(browser_mutex);
  45         if (browser != nullptr) {
  46                 if (delay_ms <= 0) {
  47                         CefPostTask(TID_UI, new CEFTaskAdapter(std::move(func)));
  48                 } else {
  49                         CefPostDelayedTask(TID_UI, new CEFTaskAdapter(std::move(func)), delay_ms);
  50                 }
  51         } else {
  52                 deferred_tasks.push_back(std::move(func));
  53         }
  54 }
  55
  56 void CEFCapture::set_url(const string &url)
  57 {
  58         post_to_cef_ui_thread([this, url] {
  59                 loaded = false;
  60                 browser->GetMainFrame()->LoadURL(url);
  61         });
  62 }
  63
  64 void CEFCapture::reload()
  65 {
  66         post_to_cef_ui_thread([this] {
  67                 loaded = false;
  68                 browser->Reload();
  69         });
  70 }
  71
  72 void CEFCapture::set_max_fps(int max_fps)
  73 {
  74         post_to_cef_ui_thread([this, max_fps] {
  75                 browser->GetHost()->SetWindowlessFrameRate(max_fps);
  76                 this->max_fps = max_fps;
  77         });
  78 }
  79
  80 void CEFCapture::execute_javascript_async(const string &js)
  81 {
  82         post_to_cef_ui_thread([this, js] {
  83                 if (loaded) {
  84                         CefString script_url("<theme eval>");
  85                         int start_line = 1;
  86                         browser->GetMainFrame()->ExecuteJavaScript(js, script_url, start_line);
  87                 } else {
  88                         deferred_javascript.push_back(js);
  89                 }
  90         });
  91 }
  92
  93 void CEFCapture::resize(unsigned width, unsigned height)
  94 {
  95         lock_guard<mutex> lock(resolution_mutex);
  96         this->width = width;
  97         this->height = height;
  98 }
  99
 100 void CEFCapture::OnPaint(const void *buffer, int width, int height)
 101 {
 102         steady_clock::time_point timestamp = steady_clock::now();
 103
 104         VideoFormat video_format;
 105         video_format.width = width;
 106         video_format.height = height;
 107         video_format.stride = width * 4;
 108         video_format.frame_rate_nom = max_fps;
 109         video_format.frame_rate_den = 1;
 110         video_format.has_signal = true;
 111         video_format.is_connected = true;
 112
 113         FrameAllocator::Frame video_frame = video_frame_allocator->alloc_frame();
 114         if (video_frame.data == nullptr) {
 115                 // We lost a frame, so we need to invalidate the entire thing.
 116                 // (CEF only sends OnPaint when there are actual changes,
 117                 // so we need to do this explicitly, or we could be stuck on an
 118                 // old frame forever if the image doesn't change.)
 119                 //
 120                 // By adding a delay, we make sure we don't get a new frame
 121                 // delivered immediately (we probably already are on the UI thread),
 122                 // where we couldn't really deal with it.
 123                 post_to_cef_ui_thread([this] {
 124                         lock_guard<recursive_mutex> lock(browser_mutex);
 125                         if (browser != nullptr) {  // Could happen if we are shutting down.
 126                                 browser->GetHost()->Invalidate(PET_VIEW);
 127                         }
 128                 }, 16);
 129                 ++timecode;
 130         } else {
 131                 assert(video_frame.size >= unsigned(width * height * 4));
 132                 assert(!video_frame.interleaved);
 133                 memcpy(video_frame.data, buffer, width * height * 4);
 134                 video_frame.len = video_format.stride * height;
 135                 video_frame.received_timestamp = timestamp;
 136                 frame_callback(timecode++,
 137                         video_frame, 0, video_format,
 138                         FrameAllocator::Frame(), 0, AudioFormat());
 139         }
 140 }
 141
 142 void CEFCapture::OnLoadEnd()
 143 {
 144         post_to_cef_ui_thread([this] {
 145                 loaded = true;
 146                 for (const string &js : deferred_javascript) {
 147                         CefString script_url("<theme eval>");
 148                         int start_line = 1;
 149                         browser->GetMainFrame()->ExecuteJavaScript(js, script_url, start_line);
 150                 }
 151                 deferred_javascript.clear();
 152         });
 153 }
 154
 155 #define FRAME_SIZE (8 << 20)  // 8 MB.
 156
 157 void CEFCapture::configure_card()
 158 {
 159         if (video_frame_allocator == nullptr) {
 160                 owned_video_frame_allocator.reset(new MallocFrameAllocator(FRAME_SIZE, NUM_QUEUED_VIDEO_FRAMES));
 161                 set_video_frame_allocator(owned_video_frame_allocator.get());
 162         }
 163 }
 164
 165 void CEFCapture::start_bm_capture()
 166 {
 167         cef_app->initialize_cef();
 168
 169         CefPostTask(TID_UI, new CEFTaskAdapter([this]{
 170                 lock_guard<recursive_mutex> lock(browser_mutex);
 171
 172                 CefBrowserSettings browser_settings;
 173                 browser_settings.web_security = cef_state_t::STATE_DISABLED;
 174                 browser_settings.webgl = cef_state_t::STATE_ENABLED;
 175                 browser_settings.windowless_frame_rate = max_fps;
 176
 177                 CefWindowInfo window_info;
 178                 window_info.SetAsWindowless(0);
 179                 browser = CefBrowserHost::CreateBrowserSync(window_info, cef_client, start_url, browser_settings, nullptr);
 180                 for (function<void()> &task : deferred_tasks) {
 181                         task();
 182                 }
 183                 deferred_tasks.clear();
 184         }));
 185 }
 186
 187 void CEFCapture::stop_dequeue_thread()
 188 {
 189         {
 190                 lock_guard<recursive_mutex> lock(browser_mutex);
 191                 cef_app->close_browser(browser);
 192                 browser = nullptr;  // Or unref_cef() will be sad.
 193         }
 194         cef_app->unref_cef();
 195 }
 196
 197 std::map<uint32_t, VideoMode> CEFCapture::get_available_video_modes() const
 198 {
 199         VideoMode mode;
 200
 201         char buf[256];
 202         snprintf(buf, sizeof(buf), "%ux%u", width, height);
 203         mode.name = buf;
 204
 205         mode.autodetect = false;
 206         mode.width = width;
 207         mode.height = height;
 208         mode.frame_rate_num = max_fps;
 209         mode.frame_rate_den = 1;
 210         mode.interlaced = false;
 211
 212         return {{ 0, mode }};
 213 }
 214
 215 std::map<uint32_t, std::string> CEFCapture::get_available_video_inputs() const
 216 {
 217         return {{ 0, "HTML video input" }};
 218 }
 219
 220 std::map<uint32_t, std::string> CEFCapture::get_available_audio_inputs() const
 221 {
 222         return {{ 0, "Fake HTML audio input (silence)" }};
 223 }
 224
 225 void CEFCapture::set_video_mode(uint32_t video_mode_id)
 226 {
 227         assert(video_mode_id == 0);
 228 }
 229
 230 void CEFCapture::set_video_input(uint32_t video_input_id)
 231 {
 232         assert(video_input_id == 0);
 233 }
 234
 235 void CEFCapture::set_audio_input(uint32_t audio_input_id)
 236 {
 237         assert(audio_input_id == 0);
 238 }
 239
 240 void NageruCEFClient::OnPaint(CefRefPtr<CefBrowser> browser, PaintElementType type, const RectList &dirtyRects, const void *buffer, int width, int height)
 241 {
 242         parent->OnPaint(buffer, width, height);
 243 }
 244
 245 bool NageruCEFClient::GetViewRect(CefRefPtr<CefBrowser> browser, CefRect &rect)
 246 {
 247         return parent->GetViewRect(rect);
 248 }
 249
 250 bool CEFCapture::GetViewRect(CefRect &rect)
 251 {
 252         lock_guard<mutex> lock(resolution_mutex);
 253         rect = CefRect(0, 0, width, height);
 254         return true;
 255 }
 256
 257 void NageruCEFClient::OnLoadEnd(CefRefPtr<CefBrowser> browser, CefRefPtr<CefFrame> frame, int httpStatusCode)
 258 {
 259         parent->OnLoadEnd();
 260 }