jkl playback is functional

panels/viewer.cpp

@@ -44,7 +44,8 @@ Viewer::Viewer(QWidget *parent) :
 	seq(nullptr),
 	created_sequence(false),
 	minimum_zoom(1.0),
-	cue_recording_internal(false)
+	cue_recording_internal(false),
+	playback_speed(0)
 {
 	setSizePolicy(QSizePolicy::Fixed, QSizePolicy::Fixed);
 
@@ -101,15 +102,20 @@ void Viewer::set_main_sequence() {
 void Viewer::reset_all_audio() {
 	// reset all clip audio
 	if (seq != nullptr) {
-		audio_ibuffer_frame = seq->playhead;
-		audio_ibuffer_timecode = (double) audio_ibuffer_frame / seq->frame_rate;
-
+		long last_frame = 0;
 		for (int i=0;i<seq->clips.size();i++) {
 			Clip* c = seq->clips.at(i);
 			if (c != nullptr) {
 				c->reset_audio();
+				last_frame = qMax(last_frame, c->timeline_out);
 			}
 		}
+
+		audio_ibuffer_frame = seq->playhead;
+		if (playback_speed < 0) {
+			audio_ibuffer_frame = last_frame - audio_ibuffer_frame;
+		}
+		audio_ibuffer_timecode = double(audio_ibuffer_frame) / seq->frame_rate;
 	}
 	clear_audio_ibuffer();
 }
@@ -324,6 +330,14 @@ void Viewer::toggle_play() {
 	}
 }
 
+void Viewer::increase_speed() {
+	set_playback_speed(playback_speed+1);
+}
+
+void Viewer::decrease_speed() {
+	set_playback_speed(playback_speed-1);
+}
+
 void Viewer::play() {
 	if (panel_sequence_viewer->playing) panel_sequence_viewer->pause();
 	if (panel_footage_viewer->playing) panel_footage_viewer->pause();
@@ -335,6 +349,10 @@ void Viewer::play() {
 			seek(get_seq_in());
 		}
 
+		if (playback_speed == 0) {
+			playback_speed = 1;
+		}
+
 		reset_all_audio();
 		if (is_recording_cued() && !start_recording()) {
 			qCritical() << "Failed to record audio";
@@ -363,6 +381,7 @@ void Viewer::pause() {
 	just_played = false;
 	set_playpause_icon(true);
 	playback_updater.stop();
+	playback_speed = 0;
 
 	if (is_recording_cued()) {
 		uncue_recording();
@@ -432,6 +451,10 @@ void Viewer::update_parents(bool reload_fx) {
 	}
 }
 
+int Viewer::get_playback_speed() {
+	return playback_speed;
+}
+
 void Viewer::resizeEvent(QResizeEvent *) {
 	if (seq != nullptr) {
 		set_sb_max();
@@ -519,6 +542,14 @@ void Viewer::set_sb_max() {
 	headers->set_scrollbar_max(horizontal_bar, seq->getEndFrame(), headers->width());
 }
 
+void Viewer::set_playback_speed(int s) {
+	pause();
+	playback_speed = qMin(3, qMax(s, -3));
+	if (playback_speed != 0) {
+		play();
+	}
+}
+
 long Viewer::get_seq_in() {
 	return (seq->using_workarea && seq->enable_workarea)
 			? seq->workarea_in
@@ -713,7 +744,7 @@ void Viewer::update_playhead() {
 void Viewer::timer_update() {
 	previous_playhead = seq->playhead;
 
-	seq->playhead = qRound(playhead_start + ((QDateTime::currentMSecsSinceEpoch()-start_msecs) * 0.001 * seq->frame_rate));
+	seq->playhead = qRound(playhead_start + ((QDateTime::currentMSecsSinceEpoch()-start_msecs) * 0.001 * seq->frame_rate * playback_speed));
 	if (config.seek_also_selects) panel_timeline->select_from_playhead();
 	update_parents(config.seek_also_selects);
 

panels/viewer.h

@@ -67,6 +67,8 @@ public:
 	void reset_all_audio();
 	void update_parents(bool reload_fx = false);
 
+	int get_playback_speed();
+
 	ViewerWidget* viewer_widget;
 
 	Media* media;
@@ -80,6 +82,8 @@ public slots:
 	void go_to_in();
 	void previous_frame();
 	void toggle_play();
+	void increase_speed();
+	void decrease_speed();
 	void next_frame();
 	void go_to_out();
 	void go_to_end();
@@ -102,6 +106,7 @@ private:
 	double minimum_zoom;
 	void set_zoom_value(double d);
 	void set_sb_max();
+	void set_playback_speed(int s);
 
 	long get_seq_in();
 	long get_seq_out();
@@ -126,6 +131,7 @@ private:
 	QTimer recording_flasher;
 
 	long previous_playhead;
+	int playback_speed;
 };
 
 #endif // VIEWER_H