Move the logic to play the audio on stepping through video into video_context so that the VideoSlider's Next/PrevFrame can behave consistently regardless of where they're called from.

Originally committed to SVN as r4121.

aegisub/src/video_context.cpp

@@ -468,6 +468,34 @@ void VideoContext::GetScriptSize(int &sw,int &sh) {
 	grid->ass->GetResolution(sw,sh);
 }
 
+/// @brief Play the next frame, possibly with audio
+/// @return 
+///
+void VideoContext::PlayNextFrame() {
+	if (isPlaying)
+		return;
+
+	int thisFrame = frame_n;
+	JumpToFrame(frame_n + 1);
+	// Start playing audio
+	if (Options.AsBool(_T("Audio Plays When Stepping Video")))
+		audio->Play(VFR_Output.GetTimeAtFrame(thisFrame),VFR_Output.GetTimeAtFrame(thisFrame + 1));
+}
+
+/// @brief Play the previous frame, possibly with audio
+/// @return 
+///
+void VideoContext::PlayPrevFrame() {
+	if (isPlaying)
+		return;
+
+	int thisFrame = frame_n;
+	JumpToFrame(frame_n -1);
+	// Start playing audio
+	if (Options.AsBool(_T("Audio Plays When Stepping Video")))
+		audio->Play(VFR_Output.GetTimeAtFrame(thisFrame - 1),VFR_Output.GetTimeAtFrame(thisFrame));
+}
+
 /// @brief Play 
 /// @return 
 ///
@@ -494,6 +522,9 @@ void VideoContext::Play() {
 	playback.Start(10);
 }
 
+
+
+
 /// @brief Play line 
 /// @return 
 ///

aegisub/src/video_context.h

@@ -271,6 +271,8 @@ public:
 	wxString GetTempWorkFile ();
 
 	void Play();
+	void PlayNextFrame();
+	void PlayPrevFrame();
 	void PlayLine();
 	void Stop();
 

aegisub/src/video_slider.cpp

@@ -154,7 +154,7 @@ void VideoSlider::NextFrame() {
 	if (VideoContext::Get()->IsPlaying()) return;
 
 	//don't request out of range frames
-	if (GetValue() < max) VideoContext::Get()->JumpToFrame(GetValue()+1);
+	if (GetValue() < max) VideoContext::Get()->PlayNextFrame();
 	Refresh(false);
 	Update();
 }
@@ -168,7 +168,7 @@ void VideoSlider::PrevFrame() {
 	if (VideoContext::Get()->IsPlaying()) return;
 
 	//don't request out of range frames
-	if (GetValue() > min) VideoContext::Get()->JumpToFrame(GetValue()-1);
+	if (GetValue() > min) VideoContext::Get()->PlayPrevFrame();
 	Refresh(false);
 	Update();
 }