massive rewrite of project data system

project/footage.cpp

@@ -0,0 +1,57 @@
+#include "footage.h"
+
+#include <QDebug>
+#include <QtMath>
+#include "io/previewgenerator.h"
+
+extern "C" {
+	#include <libavformat/avformat.h>
+}
+
+#include "project/clip.h"
+
+Footage::Footage() : ready(false), preview_gen(NULL), invalid(false), in(0), out(0) {
+    ready_lock.lock();
+}
+
+Footage::~Footage() {
+    reset();
+}
+
+void Footage::reset() {
+	if (preview_gen != NULL) {
+		preview_gen->cancel();
+		preview_gen->wait();
+    }
+    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();
+    ready = false;
+}
+
+long Footage::get_length_in_frames(double frame_rate) {
+    if (length >= 0) return qFloor(((double) length / (double) AV_TIME_BASE) * frame_rate);
+    return 0;
+}
+
+FootageStream* Footage::get_stream_from_file_index(bool video, int index) {
+    if (video) {
+        for (int i=0;i<video_tracks.size();i++) {
+            if (video_tracks.at(i)->file_index == index) {
+                return video_tracks.at(i);
+            }
+        }
+    } else {
+        for (int i=0;i<audio_tracks.size();i++) {
+            if (audio_tracks.at(i)->file_index == index) {
+                return audio_tracks.at(i);
+            }
+        }
+    }
+    return NULL;
+}