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)
  43 {
  44         lock_guard<mutex> lock(browser_mutex);
  45         if (browser != nullptr) {
  46                 CefPostTask(TID_UI, new CEFTaskAdapter(std::move(func)));
  47         } else {
  48                 deferred_tasks.push_back(std::move(func));
  49         }
  50 }
  51
  52 void CEFCapture::set_url(const string &url)
  53 {
  54         post_to_cef_ui_thread([this, url] {
  55                 loaded = false;
  56                 browser->GetMainFrame()->LoadURL(url);
  57         });
  58 }
  59
  60 void CEFCapture::reload()
  61 {
  62         post_to_cef_ui_thread([this] {
  63                 browser->Reload();
  64         });
  65 }
  66
  67 void CEFCapture::set_max_fps(int max_fps)
  68 {
  69         post_to_cef_ui_thread([this, max_fps] {
  70                 browser->GetHost()->SetWindowlessFrameRate(max_fps);
  71                 this->max_fps = max_fps;
  72         });
  73 }
  74
  75 void CEFCapture::execute_javascript_async(const string &js)
  76 {
  77         post_to_cef_ui_thread([this, js] {
  78                 if (loaded) {
  79                         CefString script_url("<theme eval>");
  80                         int start_line = 1;
  81                         browser->GetMainFrame()->ExecuteJavaScript(js, script_url, start_line);
  82                 } else {
  83                         deferred_javascript.push_back(js);
  84                 }
  85         });
  86 }
  87
  88 void CEFCapture::OnPaint(const void *buffer, int width, int height)
  89 {
  90         steady_clock::time_point timestamp = steady_clock::now();
  91
  92         VideoFormat video_format;
  93         video_format.width = width;
  94         video_format.height = height;
  95         video_format.stride = width * 4;
  96         video_format.frame_rate_nom = max_fps;
  97         video_format.frame_rate_den = 1;
  98         video_format.has_signal = true;
  99         video_format.is_connected = true;
 100
 101         FrameAllocator::Frame video_frame = video_frame_allocator->alloc_frame();
 102         if (video_frame.data == nullptr) {
 103                 // We lost a frame, so we need to invalidate the entire thing.
 104                 // (CEF only sends OnPaint when there are actual changes,
 105                 // so we need to do this explicitly, or we could be stuck on an
 106                 // old frame forever if the image doesn't change.)
 107                 post_to_cef_ui_thread([this] {
 108                         browser->GetHost()->Invalidate(PET_VIEW);
 109                 });
 110                 ++timecode;
 111         } else {
 112                 assert(video_frame.size >= unsigned(width * height * 4));
 113                 assert(!video_frame.interleaved);
 114                 memcpy(video_frame.data, buffer, width * height * 4);
 115                 video_frame.len = video_format.stride * height;
 116                 video_frame.received_timestamp = timestamp;
 117                 frame_callback(timecode++,
 118                         video_frame, 0, video_format,
 119                         FrameAllocator::Frame(), 0, AudioFormat());
 120         }
 121 }
 122
 123 void CEFCapture::OnLoadEnd()
 124 {
 125         post_to_cef_ui_thread([this] {
 126                 loaded = true;
 127                 for (const string &js : deferred_javascript) {
 128                         CefString script_url("<theme eval>");
 129                         int start_line = 1;
 130                         browser->GetMainFrame()->ExecuteJavaScript(js, script_url, start_line);
 131                 }
 132                 deferred_javascript.clear();
 133         });
 134 }
 135
 136 #define FRAME_SIZE (8 << 20)  // 8 MB.
 137
 138 void CEFCapture::configure_card()
 139 {
 140         if (video_frame_allocator == nullptr) {
 141                 owned_video_frame_allocator.reset(new MallocFrameAllocator(FRAME_SIZE, NUM_QUEUED_VIDEO_FRAMES));
 142                 set_video_frame_allocator(owned_video_frame_allocator.get());
 143         }
 144 }
 145
 146 void CEFCapture::start_bm_capture()
 147 {
 148         cef_app->initialize_cef();
 149
 150         CefPostTask(TID_UI, new CEFTaskAdapter([this]{
 151                 lock_guard<mutex> lock(browser_mutex);
 152
 153                 CefBrowserSettings browser_settings;
 154                 browser_settings.web_security = cef_state_t::STATE_DISABLED;
 155                 browser_settings.webgl = cef_state_t::STATE_ENABLED;
 156                 browser_settings.windowless_frame_rate = max_fps;
 157
 158                 CefWindowInfo window_info;
 159                 window_info.SetAsWindowless(0);
 160                 browser = CefBrowserHost::CreateBrowserSync(window_info, cef_client, start_url, browser_settings, nullptr);
 161                 for (function<void()> &task : deferred_tasks) {
 162                         task();
 163                 }
 164                 deferred_tasks.clear();
 165         }));
 166 }
 167
 168 void CEFCapture::stop_dequeue_thread()
 169 {
 170         lock_guard<mutex> lock(browser_mutex);
 171         cef_app->close_browser(browser);
 172         browser = nullptr;  // Or unref_cef() will be sad.
 173         cef_app->unref_cef();
 174 }
 175
 176 std::map<uint32_t, VideoMode> CEFCapture::get_available_video_modes() const
 177 {
 178         VideoMode mode;
 179
 180         char buf[256];
 181         snprintf(buf, sizeof(buf), "%ux%u", width, height);
 182         mode.name = buf;
 183
 184         mode.autodetect = false;
 185         mode.width = width;
 186         mode.height = height;
 187         mode.frame_rate_num = max_fps;
 188         mode.frame_rate_den = 1;
 189         mode.interlaced = false;
 190
 191         return {{ 0, mode }};
 192 }
 193
 194 std::map<uint32_t, std::string> CEFCapture::get_available_video_inputs() const
 195 {
 196         return {{ 0, "HTML video input" }};
 197 }
 198
 199 std::map<uint32_t, std::string> CEFCapture::get_available_audio_inputs() const
 200 {
 201         return {{ 0, "Fake HTML audio input (silence)" }};
 202 }
 203
 204 void CEFCapture::set_video_mode(uint32_t video_mode_id)
 205 {
 206         assert(video_mode_id == 0);
 207 }
 208
 209 void CEFCapture::set_video_input(uint32_t video_input_id)
 210 {
 211         assert(video_input_id == 0);
 212 }
 213
 214 void CEFCapture::set_audio_input(uint32_t audio_input_id)
 215 {
 216         assert(audio_input_id == 0);
 217 }
 218
 219 void NageruCEFClient::OnPaint(CefRefPtr<CefBrowser> browser, PaintElementType type, const RectList &dirtyRects, const void *buffer, int width, int height)
 220 {
 221         parent->OnPaint(buffer, width, height);
 222 }
 223
 224 bool NageruCEFClient::GetViewRect(CefRefPtr<CefBrowser> browser, CefRect &rect)
 225 {
 226         rect = CefRect(0, 0, width, height);
 227         return true;
 228 }
 229
 230 void NageruCEFClient::OnLoadEnd(CefRefPtr<CefBrowser> browser, CefRefPtr<CefFrame> frame, int httpStatusCode)
 231 {
 232         parent->OnLoadEnd();
 233 }