Implement audio sync foundations

app/node/project/footage/footagedescription.cpp

@@ -63,6 +63,26 @@ bool FootageDescription::Load(const QString &filename)
 				while (XMLReadNextStartElement(&reader)) {
 					if (reader.name() == QStringLiteral("decoder")) {
 						decoder_ = reader.readElementText();
+					} else if (reader.name() ==
+							   QStringLiteral("sourcestarttime")) {
+						QString source;
+						{
+							XMLAttributeLoop((&reader), attr)
+							{
+								if (attr.name() == QStringLiteral("source")) {
+									source = attr.value().toString();
+								}
+							}
+						}
+
+						const QStringList split =
+							reader.readElementText().split('/');
+						if (split.size() == 2) {
+							SetSourceStartTime(
+								rational(split.at(0).toInt(),
+										 split.at(1).toInt()),
+								source);
+						}
 					} else if (reader.name() == QStringLiteral("streams")) {
 						{
 							XMLAttributeLoop((&reader), attr)
@@ -133,6 +153,16 @@ bool FootageDescription::Save(const QString &filename) const
 
 	writer.writeTextElement(QStringLiteral("decoder"), decoder_);
 
+	if (has_source_start_time_) {
+		writer.writeStartElement(QStringLiteral("sourcestarttime"));
+		writer.writeAttribute(QStringLiteral("source"),
+							  source_start_time_source_);
+		writer.writeCharacters(QStringLiteral("%1/%2").arg(
+			QString::number(source_start_time_.numerator()),
+			QString::number(source_start_time_.denominator())));
+		writer.writeEndElement();
+	}
+
 	writer.writeStartElement(QStringLiteral("streams"));
 
 	writer.writeAttribute(QStringLiteral("count"),

app/node/project/footage/footagedescription.h

@@ -22,6 +22,8 @@
 #ifndef FOOTAGEDESCRIPTION_H
 #define FOOTAGEDESCRIPTION_H
 
+#include <QString>
+
 #include "node/output/track/track.h"
 #include "render/subtitleparams.h"
 #include "render/videoparams.h"
@@ -34,6 +36,7 @@ public:
 	FootageDescription(const QString &decoder = QString())
 		: decoder_(decoder)
 		, total_stream_count_(0)
+		, has_source_start_time_(false)
 	{
 	}
 
@@ -131,6 +134,28 @@ public:
 		total_stream_count_ = s;
 	}
 
+	void SetSourceStartTime(const rational &time, const QString &source)
+	{
+		source_start_time_ = time;
+		source_start_time_source_ = source;
+		has_source_start_time_ = true;
+	}
+
+	bool HasSourceStartTime() const
+	{
+		return has_source_start_time_;
+	}
+
+	const rational &source_start_time() const
+	{
+		return source_start_time_;
+	}
+
+	const QString &source_start_time_source() const
+	{
+		return source_start_time_source_;
+	}
+
 	bool Load(const QString &filename);
 
 	bool Save(const QString &filename) const;
@@ -163,7 +188,7 @@ public:
 	}
 
 private:
-	static constexpr unsigned kFootageMetaVersion = 6;
+	static constexpr unsigned kFootageMetaVersion = 7;
 
 	QString decoder_;
 
@@ -174,6 +199,12 @@ private:
 	QVector<SubtitleParams> subtitle_streams_;
 
 	int total_stream_count_;
+
+	rational source_start_time_;
+
+	QString source_start_time_source_;
+
+	bool has_source_start_time_;
 };
 
 }