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(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::request_new_frame()
 101 {
 102         // By adding a delay, we make sure we don't get a new frame
 103         // delivered immediately (we probably already are on the UI thread),
 104         // where we couldn't really deal with it.
 105         post_to_cef_ui_thread([this] {
 106                 lock_guard<recursive_mutex> lock(browser_mutex);
 107                 if (browser != nullptr) {  // Could happen if we are shutting down.
 108                         browser->GetHost()->Invalidate(PET_VIEW);
 109                 }
 110         }, 16);
 111 }
 112
 113 void CEFCapture::OnPaint(const void *buffer, int width, int height)
 114 {
 115         steady_clock::time_point timestamp = steady_clock::now();
 116
 117         VideoFormat video_format;
 118         video_format.width = width;
 119         video_format.height = height;
 120         video_format.stride = width * 4;
 121         video_format.frame_rate_nom = max_fps;
 122         video_format.frame_rate_den = 1;
 123         video_format.has_signal = true;
 124         video_format.is_connected = true;
 125
 126         FrameAllocator::Frame video_frame = video_frame_allocator->alloc_frame();
 127         if (video_frame.data == nullptr) {
 128                 // We lost a frame, so we need to invalidate the entire thing.
 129                 // (CEF only sends OnPaint when there are actual changes,
 130                 // so we need to do this explicitly, or we could be stuck on an
 131                 // old frame forever if the image doesn't change.)
 132                 request_new_frame();
 133                 ++timecode;
 134         } else {
 135                 assert(video_frame.size >= unsigned(width * height * 4));
 136                 assert(!video_frame.interleaved);
 137                 memcpy(video_frame.data, buffer, width * height * 4);
 138                 video_frame.len = video_format.stride * height;
 139                 video_frame.received_timestamp = timestamp;
 140                 frame_callback(timecode++,
 141                         video_frame, 0, video_format,
 142                         FrameAllocator::Frame(), 0, AudioFormat());
 143         }
 144 }
 145
 146 void CEFCapture::OnLoadEnd()
 147 {
 148         post_to_cef_ui_thread([this] {
 149                 loaded = true;
 150                 for (const string &js : deferred_javascript) {
 151                         CefString script_url("<theme eval>");
 152                         int start_line = 1;
 153                         browser->GetMainFrame()->ExecuteJavaScript(js, script_url, start_line);
 154                 }
 155                 deferred_javascript.clear();
 156         });
 157 }
 158
 159 #define FRAME_SIZE (8 << 20)  // 8 MB.
 160
 161 void CEFCapture::configure_card()
 162 {
 163         if (video_frame_allocator == nullptr) {
 164                 owned_video_frame_allocator.reset(new MallocFrameAllocator(FRAME_SIZE, NUM_QUEUED_VIDEO_FRAMES));
 165                 set_video_frame_allocator(owned_video_frame_allocator.get());
 166         }
 167 }
 168
 169 void CEFCapture::start_bm_capture()
 170 {
 171         cef_app->initialize_cef();
 172
 173         CefPostTask(TID_UI, new CEFTaskAdapter([this]{
 174                 lock_guard<recursive_mutex> lock(browser_mutex);
 175
 176                 CefBrowserSettings browser_settings;
 177                 browser_settings.web_security = cef_state_t::STATE_DISABLED;
 178                 browser_settings.webgl = cef_state_t::STATE_ENABLED;
 179                 browser_settings.windowless_frame_rate = max_fps;
 180
 181                 CefWindowInfo window_info;
 182                 window_info.SetAsWindowless(0);
 183                 browser = CefBrowserHost::CreateBrowserSync(window_info, cef_client, start_url, browser_settings, nullptr);
 184                 for (function<void()> &task : deferred_tasks) {
 185                         task();
 186                 }
 187                 deferred_tasks.clear();
 188         }));
 189 }
 190
 191 void CEFCapture::stop_dequeue_thread()
 192 {
 193         {
 194                 lock_guard<recursive_mutex> lock(browser_mutex);
 195                 cef_app->close_browser(browser);
 196                 browser = nullptr;  // Or unref_cef() will be sad.
 197         }
 198         cef_app->unref_cef();
 199 }
 200
 201 std::map<uint32_t, VideoMode> CEFCapture::get_available_video_modes() const
 202 {
 203         VideoMode mode;
 204
 205         char buf[256];
 206         snprintf(buf, sizeof(buf), "%ux%u", width, height);
 207         mode.name = buf;
 208
 209         mode.autodetect = false;
 210         mode.width = width;
 211         mode.height = height;
 212         mode.frame_rate_num = max_fps;
 213         mode.frame_rate_den = 1;
 214         mode.interlaced = false;
 215
 216         return {{ 0, mode }};
 217 }
 218
 219 std::map<uint32_t, std::string> CEFCapture::get_available_video_inputs() const
 220 {
 221         return {{ 0, "HTML video input" }};
 222 }
 223
 224 std::map<uint32_t, std::string> CEFCapture::get_available_audio_inputs() const
 225 {
 226         return {{ 0, "Fake HTML audio input (silence)" }};
 227 }
 228
 229 void CEFCapture::set_video_mode(uint32_t video_mode_id)
 230 {
 231         assert(video_mode_id == 0);
 232 }
 233
 234 void CEFCapture::set_video_input(uint32_t video_input_id)
 235 {
 236         assert(video_input_id == 0);
 237 }
 238
 239 void CEFCapture::set_audio_input(uint32_t audio_input_id)
 240 {
 241         assert(audio_input_id == 0);
 242 }
 243
 244 void NageruCEFClient::OnPaint(CefRefPtr<CefBrowser> browser, PaintElementType type, const RectList &dirtyRects, const void *buffer, int width, int height)
 245 {
 246         parent->OnPaint(buffer, width, height);
 247 }
 248
 249 bool NageruCEFClient::GetViewRect(CefRefPtr<CefBrowser> browser, CefRect &rect)
 250 {
 251         return parent->GetViewRect(rect);
 252 }
 253
 254 bool CEFCapture::GetViewRect(CefRect &rect)
 255 {
 256         lock_guard<mutex> lock(resolution_mutex);
 257         rect = CefRect(0, 0, width, height);
 258         return true;
 259 }
 260
 261 void NageruCEFClient::OnLoadEnd(CefRefPtr<CefBrowser> browser, CefRefPtr<CefFrame> frame, int httpStatusCode)
 262 {
 263         parent->OnLoadEnd();
 264 }