citra_qt: Fix potential indeterminstism caused by starting record/playback

Previously the movie was started *after* core starts running, causing potential indeterminism.

Some desyncs are still not fixed; they may be caused by core timing. More investigation is required.

src/citra_qt/main.cpp

@@ -1018,6 +1018,9 @@ void GMainWindow::BootGame(const QString& filename) {
     if (movie_record_on_start) {
         Core::Movie::GetInstance().PrepareForRecording();
     }
+    if (movie_playback_on_start) {
+        Core::Movie::GetInstance().PrepareForPlayback(movie_playback_path.toStdString());
+    }
 
     // Save configurations
     UpdateUISettings();
@@ -1027,6 +1030,42 @@ void GMainWindow::BootGame(const QString& filename) {
     if (!LoadROM(filename))
         return;
 
+    // Set everything up
+    if (movie_record_on_start) {
+        Core::Movie::GetInstance().StartRecording(movie_record_path.toStdString(),
+                                                  movie_record_author.toStdString());
+        movie_record_on_start = false;
+        movie_record_path.clear();
+        movie_record_author.clear();
+    }
+    if (movie_playback_on_start) {
+        Core::Movie::GetInstance().StartPlayback(movie_playback_path.toStdString());
+        movie_playback_on_start = false;
+        movie_playback_path.clear();
+    }
+
+    if (ui->action_Enable_Frame_Advancing->isChecked()) {
+        ui->action_Advance_Frame->setEnabled(true);
+        Core::System::GetInstance().frame_limiter.SetFrameAdvancing(true);
+    } else {
+        ui->action_Advance_Frame->setEnabled(false);
+    }
+
+    if (video_dumping_on_start) {
+        Layout::FramebufferLayout layout{
+            Layout::FrameLayoutFromResolutionScale(VideoCore::GetResolutionScaleFactor())};
+        if (!Core::System::GetInstance().VideoDumper().StartDumping(
+                video_dumping_path.toStdString(), layout)) {
+
+            QMessageBox::critical(
+                this, tr("Citra"),
+                tr("Could not start video dumping.<br>Refer to the log for details."));
+            ui->action_Dump_Video->setChecked(false);
+        }
+        video_dumping_on_start = false;
+        video_dumping_path.clear();
+    }
+
     // Create and start the emulation thread
     emu_thread = std::make_unique<EmuThread>(*render_window);
     emit EmulationStarting(emu_thread.get());
@@ -1076,35 +1115,6 @@ void GMainWindow::BootGame(const QString& filename) {
         ShowFullscreen();
     }
 
-    if (movie_record_on_start) {
-        Core::Movie::GetInstance().StartRecording(movie_record_path.toStdString(),
-                                                  movie_record_author.toStdString());
-        movie_record_on_start = false;
-        movie_record_path.clear();
-        movie_record_author.clear();
-    }
-
-    if (ui->action_Enable_Frame_Advancing->isChecked()) {
-        ui->action_Advance_Frame->setEnabled(true);
-        Core::System::GetInstance().frame_limiter.SetFrameAdvancing(true);
-    } else {
-        ui->action_Advance_Frame->setEnabled(false);
-    }
-
-    if (video_dumping_on_start) {
-        Layout::FramebufferLayout layout{
-            Layout::FrameLayoutFromResolutionScale(VideoCore::GetResolutionScaleFactor())};
-        if (!Core::System::GetInstance().VideoDumper().StartDumping(
-                video_dumping_path.toStdString(), layout)) {
-
-            QMessageBox::critical(
-                this, tr("Citra"),
-                tr("Could not start video dumping.<br>Refer to the log for details."));
-            ui->action_Dump_Video->setChecked(false);
-        }
-        video_dumping_on_start = false;
-        video_dumping_path.clear();
-    }
     OnStartGame();
 }
 
@@ -1128,7 +1138,6 @@ void GMainWindow::ShutdownGame() {
     AllowOSSleep();
 
     discord_rpc->Pause();
-    OnCloseMovie(true);
     emu_thread->RequestStop();
 
     // Release emu threads from any breakpoints
@@ -1147,6 +1156,8 @@ void GMainWindow::ShutdownGame() {
     emu_thread->wait();
     emu_thread = nullptr;
 
+    OnCloseMovie();
+
     discord_rpc->Update();
 
     Camera::QtMultimediaCameraHandler::ReleaseHandlers();
@@ -1875,22 +1886,21 @@ void GMainWindow::OnPlayMovie() {
         return;
     }
 
-    const auto movie_path = dialog.GetMoviePath().toStdString();
-    Core::Movie::GetInstance().PrepareForPlayback(movie_path);
+    movie_playback_on_start = true;
+    movie_playback_path = dialog.GetMoviePath();
     BootGame(dialog.GetGamePath());
 
-    Core::Movie::GetInstance().StartPlayback(movie_path);
     ui->action_Close_Movie->setEnabled(true);
 }
 
-void GMainWindow::OnCloseMovie(bool shutting_down) {
+void GMainWindow::OnCloseMovie() {
     if (movie_record_on_start) {
         QMessageBox::information(this, tr("Record Movie"), tr("Movie recording cancelled."));
         movie_record_on_start = false;
         movie_record_path.clear();
         movie_record_author.clear();
     } else {
-        const bool was_running = !shutting_down && emu_thread && emu_thread->IsRunning();
+        const bool was_running = emu_thread && emu_thread->IsRunning();
         if (was_running) {
             OnPauseGame();
         }

src/citra_qt/main.h

@@ -208,7 +208,7 @@ private slots:
     void OnCreateGraphicsSurfaceViewer();
     void OnRecordMovie();
     void OnPlayMovie();
-    void OnCloseMovie(bool shutting_down = false);
+    void OnCloseMovie();
     void OnCaptureScreenshot();
 #ifdef ENABLE_FFMPEG_VIDEO_DUMPER
     void OnStartVideoDumping();
@@ -269,6 +269,9 @@ private:
     QString movie_record_path;
     QString movie_record_author;
 
+    bool movie_playback_on_start = false;
+    QString movie_playback_path;
+
     // Video dumping
     bool video_dumping_on_start = false;
     QString video_dumping_path;

src/core/movie.cpp

@@ -491,6 +491,7 @@ void Movie::SaveMovie() {
 
     CTMHeader header = {};
     header.filetype = header_magic_bytes;
+    header.program_id = program_id;
     header.clock_init_time = init_time;
     header.id = id;
 
@@ -500,8 +501,6 @@ void Movie::SaveMovie() {
     header.rerecord_count = rerecord_count;
     header.input_count = GetInputCount(recorded_input);
 
-    Core::System::GetInstance().GetAppLoader().ReadProgramId(header.program_id);
-
     std::string rev_bytes;
     CryptoPP::StringSource(Common::g_scm_rev, true,
                            new CryptoPP::HexDecoder(new CryptoPP::StringSink(rev_bytes)));
@@ -562,6 +561,10 @@ void Movie::StartRecording(const std::string& movie_file, const std::string& aut
     CryptoPP::AutoSeededRandomPool rng;
     rng.GenerateBlock(reinterpret_cast<CryptoPP::byte*>(&id), sizeof(id));
 
+    // Get program ID
+    program_id = 0;
+    Core::System::GetInstance().GetAppLoader().ReadProgramId(program_id);
+
     LOG_INFO(Movie, "Enabling Movie recording, ID: {:016X}", id);
 }
 

src/core/movie.h

@@ -159,6 +159,8 @@ private:
     std::string record_movie_file;
     std::string record_movie_author;
 
+    u64 init_time; // Clock init time override for RNG consistency
+
     std::vector<u8> recorded_input;
     std::size_t current_byte = 0;
     u64 current_input = 0;
@@ -166,7 +168,7 @@ private:
     u64 total_input = 0;
 
     u64 id = 0; // ID of the current movie loaded
-    u64 init_time;
+    u64 program_id = 0;
     u32 rerecord_count = 1;
     bool read_only = true;