minor improvements

app/audio/audiomanager.cpp

@@ -61,7 +61,6 @@ bool AudioManager::IsRefreshing()
   return refreshing_devices_;
 }
 
-#include <QDebug>
 void AudioManager::StartOutput(QIODevice *device)
 {
   if (output_ == nullptr) {
@@ -75,7 +74,7 @@ void AudioManager::StartOutput(QIODevice *device)
 
 void AudioManager::StopOutput()
 {
-  if (output_ == nullptr) {
+  if (output_ == nullptr || output_file_ == nullptr) {
     return;
   }
 

app/widget/viewer/viewer.cpp

@@ -196,8 +196,10 @@ void ViewerWidget::PlayInternal(int speed)
   start_timestamp_ = ruler_->GetTime();
   playback_speed_ = speed;
 
-  /*QFile* file = new QFile("path-to-cache-audio");
+  /*QFile* file = new QFile("path-to-file");
   if (file->open(QFile::ReadOnly)) {
+    file->seek(static_cast<qint64>(qFloor(GetTime().toDouble() * 44100 * 2)) * static_cast<qint64>(sizeof(float)));
+
     AudioManager::instance()->StartOutput(file);
   }*/