Read JSON from ffprobe

Use JSON output from ffprobe instead of string parsing to get some kind
of type safety.

For doing that, some changes were needed in FileView: Use delegates for
displaying Duration and Bitrate instead of mangling output in
Qt::Displayrole.

To reuse code, move all delegates from the new Archive to a separate
file.

And, of course, the initial objective: Show the accumulated size and
duration of selected files in the status bar from the experimental
archive.

1 files changed, 14 insertions, 22 deletions

diff --git a/helper.cpp b/helper.cpp
index b73ea2a..1881102 100644
--- a/helper.cpp
+++ b/helper.cpp
@@ -19,9 +19,11 @@
 #include <QProcess>
 #include <QRect>
 #include <QTime>
-#include <QtWidgets/QWidget>
-#include <QtWidgets/QDesktopWidget>
-#include <QtWidgets/QApplication>
+#include <QWidget>
+#include <QDesktopWidget>
+#include <QApplication>
+#include <QJsonDocument>
+#include <QJsonObject>
 
 #include <stdio.h>
 
@@ -216,32 +218,22 @@ namespace Helper {
 		widget->move(widgetRect.topLeft());
 	}
 
-    QList<QVariant> duration(const QString &path){
+
+    QVariantMap ffmpegData(const QString &path){
         QSettings s;
         QString ffProbe = s.value("paths/ffprobe").toString();
         QStringList args;
-        QList<QVariant> retval = QList<QVariant>() << QVariant() << QVariant();
-        args << "-show_streams" << path;
+        QVariantMap retval;
+        args << "-v" << "quiet" << "-print_format" << "json" << "-show_format" << path;
         QProcess ffproc;
         ffproc.start(ffProbe, args);
         if(!ffproc.waitForStarted()){
-            return retval;
+            return QVariantMap();
         }
         ffproc.waitForFinished();
-        QByteArray ffData = ffproc.readAllStandardError();
-        QList<QByteArray> lines = ffData.split('\n');
-
-        foreach(QString l, lines){
-            QString llc = l.toLower();
-            if(llc.contains("duration")){
-                int idx = llc.indexOf("duration:");
-                retval[0].setValue(Duration(llc.mid(idx + 10, 8)));
-                idx = llc.indexOf("bitrate:");
-                retval[1] = llc.mid(idx + 9);
-                break;
-            }
-        }
-        return retval;
+        QByteArray ffData = ffproc.readAllStandardOutput();
+        QJsonDocument jsDoc = QJsonDocument::fromJson(ffData);
+        return jsDoc.object().value("format").toObject().toVariantMap();
     }
 
     Duration::Duration() : mHours(0), mMinutes(0), mSeconds(0) {}
@@ -249,7 +241,7 @@ namespace Helper {
     Duration::Duration(qint64 seconds){
         int sec(0), min(0), h(0);
         // get hours
-        h = (seconds / 60 / 60) % 24;
+        h = (seconds / 60 / 60);
         // remaining minutes
         min = (seconds / 60) % 60;
         // seconds