AudioProperties: add functions to get properties about time

Clement Champetier · Clement Champetier · commit cec6d002b73a · 2015-01-19T14:34:09.000+01:00
* getTicksPerFrame.
* getTimeBase.
* getFps.
* getDuration.
diff --git a/src/AvTranscoder/mediaProperty/AudioProperties.cpp b/src/AvTranscoder/mediaProperty/AudioProperties.cpp
@@ -163,6 +163,44 @@ size_t AudioProperties::getNbSamples() const
 	return _formatContext->streams[_streamId]->nb_frames;
 }
 
+size_t AudioProperties::getTicksPerFrame() const
+{
+	if( ! _codecContext )
+		throw std::runtime_error( "unknown codec context" );
+	return _codecContext->ticks_per_frame;
+}
+
+Rational AudioProperties::getTimeBase() const
+{
+	if( ! _codecContext )
+		throw std::runtime_error( "unknown codec context" );
+
+	Rational timeBase = {
+		_formatContext->streams[_streamId]->time_base.num,
+		_formatContext->streams[_streamId]->time_base.den,
+	};
+	return timeBase;
+}
+
+double AudioProperties::getFps() const
+{
+	Rational timeBase = getTimeBase();
+	double fps = 1.0 * timeBase.den / ( timeBase.num * getTicksPerFrame() );
+	if( isinf( fps ) )
+		fps = 0.0;
+	return fps;
+}
+
+double AudioProperties::getDuration() const
+{
+	if( ! _formatContext )
+		throw std::runtime_error( "unknown format context" );
+
+	Rational timeBase = getTimeBase();
+	double duration = ( timeBase.num / (double) timeBase.den ) * _formatContext->streams[_streamId]->duration;
+	return duration;
+}
+
 PropertiesMap AudioProperties::getPropertiesAsMap() const
 {
 	PropertiesMap dataMap;
@@ -180,6 +218,10 @@ PropertiesMap AudioProperties::getPropertiesAsMap() const
 	detail::add( dataMap, "channelLayout", getChannelLayout() );
 	detail::add( dataMap, "channelName", getChannelName() );
 	detail::add( dataMap, "channelDescription", getChannelDescription() );
+	detail::add( dataMap, "ticksPerFrame", getTicksPerFrame() );
+	detail::add( dataMap, "timeBase", getTimeBase() );
+	detail::add( dataMap, "fps", getFps() );
+	detail::add( dataMap, "duration", getDuration() );
 
 	for( size_t metadataIndex = 0; metadataIndex < _metadatas.size(); ++metadataIndex )
 	{
diff --git a/src/AvTranscoder/mediaProperty/AudioProperties.hpp b/src/AvTranscoder/mediaProperty/AudioProperties.hpp
@@ -32,6 +32,11 @@ class AvExport AudioProperties
 	size_t getBitRate() const;
 	size_t getNbSamples() const;
 
+	size_t getTicksPerFrame() const;
+	Rational getTimeBase() const;
+	double getFps() const;
+	double getDuration() const;
+
 	PropertiesMap& getMetadatas() { return _metadatas; }
 
 #ifndef SWIG
