added many linking features

io/media.cpp

@@ -4,6 +4,21 @@ extern "C" {
 	#include <libavformat/avformat.h>
 }
 
+Media::Media() {
+
+}
+
+Media::~Media() {
+    for (int i=0;i<video_tracks.size();i++) {
+        delete video_tracks.at(i);
+    }
+    for (int i=0;i<audio_tracks.size();i++) {
+        delete audio_tracks.at(i);
+    }
+    video_tracks.clear();
+    audio_tracks.clear();
+}
+
 long Media::get_length_in_frames(float frame_rate) {
 	return ceil((float) length / (float) AV_TIME_BASE * frame_rate);
 }

io/media.h

@@ -5,6 +5,7 @@
 #include <QVector>
 #include <QMetaType>
 #include <QVariant>
+#include <QMutex>
 
 struct Sequence;
 
@@ -13,16 +14,23 @@ struct MediaStream {
 	int video_width;
 	int video_height;
 	bool infinite_length;
+
+    // preview thumbnail/waveform
+    QPixmap* preview;
+    QMutex preview_lock;
 };
 
 struct Media
 {
+    Media();
+    ~Media();
+
 	QString url;
 	QString name;
 	bool is_sequence;
 	int64_t length;
-	QVector<MediaStream> video_tracks;
-	QVector<MediaStream> audio_tracks;
+    QVector<MediaStream*> video_tracks;
+    QVector<MediaStream*> audio_tracks;
 	Sequence* sequence;
     int save_id;
 	long get_length_in_frames(float frame_rate);

io/previewgenerator.cpp

@@ -0,0 +1,10 @@
+#include "previewgenerator.h"
+
+PreviewGenerator::PreviewGenerator(QWidget* parent) : QThread(parent)
+{
+
+}
+
+void PreviewGenerator::run() {
+
+}

io/previewgenerator.h

@@ -0,0 +1,13 @@
+#ifndef PREVIEWGENERATOR_H
+#define PREVIEWGENERATOR_H
+
+#include <QThread>
+
+class PreviewGenerator : public QThread
+{
+public:
+    PreviewGenerator(QWidget* parent = 0);
+    void run() override;
+};
+
+#endif // PREVIEWGENERATOR_H