more documentation and exportthread restructure

dialogs/exportdialog.cpp

@@ -20,6 +20,10 @@
 
 #include "exportdialog.h"
 
+extern "C" {
+#include <libavformat/avformat.h>
+}
+
 #include <QOpenGLWidget>
 #include <QFileDialog>
 #include <QThread>
@@ -39,10 +43,6 @@
 #include "rendering/exportthread.h"
 #include "ui/mainwindow.h"
 
-extern "C" {
-#include <libavformat/avformat.h>
-}
-
 enum ExportFormats {
   FORMAT_3GPP,
   FORMAT_AIFF,
@@ -118,9 +118,6 @@ ExportDialog::ExportDialog(QWidget *parent) :
   vcodec_params.threads = 0;
 }
 
-ExportDialog::~ExportDialog()
-{}
-
 void ExportDialog::add_codec_to_combobox(QComboBox* box, enum AVCodecID codec) {
   QString codec_name;
 
@@ -334,21 +331,42 @@ void ExportDialog::format_changed(int index) {
 }
 
 void ExportDialog::render_thread_finished() {
-  if (progressBar->value() < 100 && !cancelled) {
+  // Determine if the export succeeded
+  bool succeeded = (progressBar->value() == 100);
+
+  // If it failed and we didn't cancel it, it must have errored out. Show an error message.
+  if (!succeeded && !et->WasInterrupted()) {
     QMessageBox::critical(
           this,
           tr("Export Failed"),
-          tr("Export failed - %1").arg(export_error),
+          tr("Export failed - %1").arg(et->GetError()),
           QMessageBox::Ok
           );
   }
+
+  // Clear audio buffer
   clear_audio_ibuffer();
+
+  // Re-enable/disable UI widgets based on the rendering state
   prep_ui_for_render(false);
+
+  // Move OpenGL context back to the sequence viewer
   panel_sequence_viewer->viewer_widget->makeCurrent();
   panel_sequence_viewer->viewer_widget->initializeGL();
+
+  // Update the application UI
   update_ui(false);
+
+  // Disconnect cancel button from export thread
+  disconnect(renderCancel, SIGNAL(clicked(bool)), et, SLOT(Interrupt()));
+
+  // Free the export thread
   et->deleteLater();
-  if (progressBar->value() == 100) accept();
+
+  // If the export succeeded, close the dialog
+  if (succeeded) {
+    accept();
+  }
 }
 
 void ExportDialog::prep_ui_for_render(bool r) {
@@ -543,7 +561,8 @@ void ExportDialog::export_action() {
     et = new ExportThread(params, vcodec_params, this);
 
     connect(et, SIGNAL(finished()), this, SLOT(render_thread_finished()));
-    connect(et, SIGNAL(progress_changed(int, qint64)), this, SLOT(update_progress_bar(int, qint64)));
+    connect(et, SIGNAL(ProgressChanged(int, qint64)), this, SLOT(update_progress_bar(int, qint64)));
+    connect(renderCancel, SIGNAL(clicked(bool)), et, SLOT(Interrupt()));
 
     close_active_clips(olive::ActiveSequence.get());
 
@@ -553,8 +572,6 @@ void ExportDialog::export_action() {
 
     prep_ui_for_render(true);
 
-    cancelled = false;
-
     total_export_time_start = QDateTime::currentMSecsSinceEpoch();
 
     et->start();
@@ -587,11 +604,6 @@ void ExportDialog::update_progress_bar(int value, qint64 remaining_ms) {
   progressBar->setValue(value);
 }
 
-void ExportDialog::cancel_render() {
-  et->continueEncode = false;
-  cancelled = true;
-}
-
 void ExportDialog::vcodec_changed(int index) {
   compressionTypeCombobox->clear();
 
@@ -755,7 +767,6 @@ void ExportDialog::setup_ui() {
   renderCancel = new QPushButton(this);
   renderCancel->setIcon(QIcon(":/icons/error.svg"));
   renderCancel->setEnabled(false);
-  connect(renderCancel, SIGNAL(clicked(bool)), this, SLOT(cancel_render()));
   progressLayout->addWidget(renderCancel);
 
   verticalLayout->addLayout(progressLayout);