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                 loaded = false;
  64                 browser->Reload();
  65         });
  66 }
  67
  68 void CEFCapture::set_max_fps(int max_fps)
  69 {
  70         post_to_cef_ui_thread([this, max_fps] {
  71                 browser->GetHost()->SetWindowlessFrameRate(max_fps);
  72                 this->max_fps = max_fps;
  73         });
  74 }
  75
  76 void CEFCapture::execute_javascript_async(const string &js)
  77 {
  78         post_to_cef_ui_thread([this, js] {
  79                 if (loaded) {
  80                         CefString script_url("<theme eval>");
  81                         int start_line = 1;
  82                         browser->GetMainFrame()->ExecuteJavaScript(js, script_url, start_line);
  83                 } else {
  84                         deferred_javascript.push_back(js);
  85                 }
  86         });
  87 }
  88
  89 void CEFCapture::OnPaint(const void *buffer, int width, int height)
  90 {
  91         steady_clock::time_point timestamp = steady_clock::now();
  92
  93         VideoFormat video_format;
  94         video_format.width = width;
  95         video_format.height = height;
  96         video_format.stride = width * 4;
  97         video_format.frame_rate_nom = max_fps;
  98         video_format.frame_rate_den = 1;
  99         video_format.has_signal = true;
 100         video_format.is_connected = true;
 101
 102         FrameAllocator::Frame video_frame = video_frame_allocator->alloc_frame();
 103         if (video_frame.data == nullptr) {
 104                 // We lost a frame, so we need to invalidate the entire thing.
 105                 // (CEF only sends OnPaint when there are actual changes,
 106                 // so we need to do this explicitly, or we could be stuck on an
 107                 // old frame forever if the image doesn't change.)
 108                 post_to_cef_ui_thread([this] {
 109                         browser->GetHost()->Invalidate(PET_VIEW);
 110                 });
 111                 ++timecode;
 112         } else {
 113                 assert(video_frame.size >= unsigned(width * height * 4));
 114                 assert(!video_frame.interleaved);
 115                 memcpy(video_frame.data, buffer, width * height * 4);
 116                 video_frame.len = video_format.stride * height;
 117                 video_frame.received_timestamp = timestamp;
 118                 frame_callback(timecode++,
 119                         video_frame, 0, video_format,
 120                         FrameAllocator::Frame(), 0, AudioFormat());
 121         }
 122 }
 123
 124 void CEFCapture::OnLoadEnd()
 125 {
 126         post_to_cef_ui_thread([this] {
 127                 loaded = true;
 128                 for (const string &js : deferred_javascript) {
 129                         CefString script_url("<theme eval>");
 130                         int start_line = 1;
 131                         browser->GetMainFrame()->ExecuteJavaScript(js, script_url, start_line);
 132                 }
 133                 deferred_javascript.clear();
 134         });
 135 }
 136
 137 #define FRAME_SIZE (8 << 20)  // 8 MB.
 138
 139 void CEFCapture::configure_card()
 140 {
 141         if (video_frame_allocator == nullptr) {
 142                 owned_video_frame_allocator.reset(new MallocFrameAllocator(FRAME_SIZE, NUM_QUEUED_VIDEO_FRAMES));
 143                 set_video_frame_allocator(owned_video_frame_allocator.get());
 144         }
 145 }
 146
 147 void CEFCapture::start_bm_capture()
 148 {
 149         cef_app->initialize_cef();
 150
 151         CefPostTask(TID_UI, new CEFTaskAdapter([this]{
 152                 lock_guard<mutex> lock(browser_mutex);
 153
 154                 CefBrowserSettings browser_settings;
 155                 browser_settings.web_security = cef_state_t::STATE_DISABLED;
 156                 browser_settings.webgl = cef_state_t::STATE_ENABLED;
 157                 browser_settings.windowless_frame_rate = max_fps;
 158
 159                 CefWindowInfo window_info;
 160                 window_info.SetAsWindowless(0);
 161                 browser = CefBrowserHost::CreateBrowserSync(window_info, cef_client, start_url, browser_settings, nullptr);
 162                 for (function<void()> &task : deferred_tasks) {
 163                         task();
 164                 }
 165                 deferred_tasks.clear();
 166         }));
 167 }
 168
 169 void CEFCapture::stop_dequeue_thread()
 170 {
 171         lock_guard<mutex> lock(browser_mutex);
 172         cef_app->close_browser(browser);
 173         browser = nullptr;  // Or unref_cef() will be sad.
 174         cef_app->unref_cef();
 175 }
 176
 177 std::map<uint32_t, VideoMode> CEFCapture::get_available_video_modes() const
 178 {
 179         VideoMode mode;
 180
 181         char buf[256];
 182         snprintf(buf, sizeof(buf), "%ux%u", width, height);
 183         mode.name = buf;
 184
 185         mode.autodetect = false;
 186         mode.width = width;
 187         mode.height = height;
 188         mode.frame_rate_num = max_fps;
 189         mode.frame_rate_den = 1;
 190         mode.interlaced = false;
 191
 192         return {{ 0, mode }};
 193 }
 194
 195 std::map<uint32_t, std::string> CEFCapture::get_available_video_inputs() const
 196 {
 197         return {{ 0, "HTML video input" }};
 198 }
 199
 200 std::map<uint32_t, std::string> CEFCapture::get_available_audio_inputs() const
 201 {
 202         return {{ 0, "Fake HTML audio input (silence)" }};
 203 }
 204
 205 void CEFCapture::set_video_mode(uint32_t video_mode_id)
 206 {
 207         assert(video_mode_id == 0);
 208 }
 209
 210 void CEFCapture::set_video_input(uint32_t video_input_id)
 211 {
 212         assert(video_input_id == 0);
 213 }
 214
 215 void CEFCapture::set_audio_input(uint32_t audio_input_id)
 216 {
 217         assert(audio_input_id == 0);
 218 }
 219
 220 void NageruCEFClient::OnPaint(CefRefPtr<CefBrowser> browser, PaintElementType type, const RectList &dirtyRects, const void *buffer, int width, int height)
 221 {
 222         parent->OnPaint(buffer, width, height);
 223 }
 224
 225 bool NageruCEFClient::GetViewRect(CefRefPtr<CefBrowser> browser, CefRect &rect)
 226 {
 227         rect = CefRect(0, 0, width, height);
 228         return true;
 229 }
 230
 231 void NageruCEFClient::OnLoadEnd(CefRefPtr<CefBrowser> browser, CefRefPtr<CefFrame> frame, int httpStatusCode)
 232 {
 233         parent->OnLoadEnd();
 234 }