Video playback with mpv

Add video playback with mpv

• Add the mpv widget
• Enable the widget only for video able documents
• Control the widget with a small set of buttons
• Seek mpv with slider that indicates the current position in the video
• Use std::chrono in the MpvControls to be sure to have the correct time unit...

Not mpv related changes

• Don't del and add docks if they are already present, just swap the contained widget => don't reset the position of the dock at sub-document updates

What it does not for now :

• Get rid of controls on MPV view when the dock goes fullscreen

src/UI/DocumentViews/MpvContainer.cc

@@ -6,7 +6,7 @@ using namespace Vivy;
 using namespace std::string_literals;
 
 void
-MpvContainer::mpvEventWakeUpCB(void *user)
+MpvContainer::mpvEventWakeUpCB(void *user) noexcept
 {
     MpvContainer *container = reinterpret_cast<MpvContainer *>(user);
     emit container->mpvEvent();
@@ -35,16 +35,31 @@ MpvContainer::MpvContainer()
         throw std::runtime_error("Failed to initialize the mpv context");
 }
 
-MpvContainer::~MpvContainer() noexcept
+void
+MpvContainer::registerMpvTimeCallback(void (*callback)(double)) noexcept
+{
+    if (mpv_time_callback)
+        qWarning() << "Override a previous mpv callback, was" << mpv_time_callback
+                   << "and now will be" << callback;
+    mpv_time_callback = callback;
+}
+
+void
+MpvContainer::closeMpv() noexcept
 {
-    // TODO: Do that in a private method
     if (mpv) {
+        registerMpvTimeCallback(nullptr);
         mpv_handle *tmp_mpv = mpv;
         mpv                 = nullptr; // Stop all other callbacks here
         mpv_destroy(tmp_mpv);
     }
 }
 
+MpvContainer::~MpvContainer() noexcept
+{
+    closeMpv();
+}
+
 void
 MpvContainer::handleMpvEvent(mpv_event *event) noexcept
 {
@@ -53,14 +68,11 @@ MpvContainer::handleMpvEvent(mpv_event *event) noexcept
     union {
         mpv_event_log_message *msg;
         mpv_event_property *prop;
-        mpv_handle *tmp_mpv;
     };
 
     switch (event->event_id) {
     case MPV_EVENT_SHUTDOWN:
-        tmp_mpv = mpv;
-        mpv = nullptr;
-        mpv_destroy(mpv);
+        closeMpv();
         break;
 
     case MPV_EVENT_VIDEO_RECONFIG:
@@ -86,6 +98,31 @@ MpvContainer::handleMpvEvent(mpv_event *event) noexcept
             }
         }
         break;
+
+    // Explicitly ignored
+    case MPV_EVENT_NONE:
+    case MPV_EVENT_GET_PROPERTY_REPLY:
+    case MPV_EVENT_SET_PROPERTY_REPLY:
+    case MPV_EVENT_COMMAND_REPLY:
+    case MPV_EVENT_START_FILE:
+    case MPV_EVENT_END_FILE:
+    case MPV_EVENT_FILE_LOADED:
+    case MPV_EVENT_TRACKS_CHANGED:
+    case MPV_EVENT_TRACK_SWITCHED:
+    case MPV_EVENT_IDLE:
+    case MPV_EVENT_PAUSE:
+    case MPV_EVENT_UNPAUSE:
+    case MPV_EVENT_TICK:
+    case MPV_EVENT_SCRIPT_INPUT_DISPATCH:
+    case MPV_EVENT_CLIENT_MESSAGE:
+    case MPV_EVENT_AUDIO_RECONFIG:
+    case MPV_EVENT_METADATA_UPDATE:
+    case MPV_EVENT_SEEK:
+    case MPV_EVENT_PLAYBACK_RESTART:
+    case MPV_EVENT_CHAPTER_CHANGE:
+    case MPV_EVENT_QUEUE_OVERFLOW:
+    case MPV_EVENT_HOOK:
+        break;
     }
 }