Dry SRC implementation for audio samples

src/ITAAudioSample.cpp

@@ -32,30 +32,6 @@ void CITAAudioSample::Init( const int iNumChannels, const int iLength, const flo
 	ITASampleFrame::Init( iNumChannels, iLength, bZeroInit );
 }
 
-void CITAAudioSample::Load( const ITASampleFrame& sfSource, const float fSourceSampleRate )
-{
-	if( fSourceSampleRate <= 0.0f )
-		ITA_EXCEPT_INVALID_PARAMETER( "Source sample rate must be greater zero." );
-
-	// Same sample rate
-	if( fabs( fSourceSampleRate - m_fSampleRate ) < 1e-20 )
-	{
-		Init( sfSource.GetNumChannels(), sfSource.GetLength(), m_fSampleRate );
-		ITASampleFrame::write( sfSource, sfSource.GetLength() );
-		return;
-	}
-
-	const int iConverter = SRC_SINC_MEDIUM_QUALITY;
-	int iSRCError;
-	SRC_STATE* pSRC = src_new( iConverter, sfSource.GetNumChannels(), &iSRCError );
-	if( pSRC == nullptr )
-		ITA_EXCEPT_INVALID_PARAMETER( "Could not create sample rate converter, samplerate error was: " + std::to_string( iSRCError ) );
-
-	const float fSRCRation = GetSampleRate() / fSourceSampleRate;
-
-	SRC_DATA	src_data;
-}
-
 void CITAAudioSample::LoadWithSampleTypeConversion( const std::string& sFilePath )
 {
 	if( m_fSampleRate <= 0.0f )
@@ -73,3 +49,41 @@ float CITAAudioSample::GetSampleRate() const
 {
 	return m_fSampleRate;
 }
+
+void CITAAudioSample::Load( const ITASampleFrame& sfSource, const float fSourceSampleRate )
+{
+	if( fSourceSampleRate <= 0.0f )
+		ITA_EXCEPT_INVALID_PARAMETER( "Source sample rate must be greater zero." );
+
+	// Same sample rate
+	if( fabs( fSourceSampleRate - m_fSampleRate ) < 1e-20 )
+	{
+		Init( sfSource.GetNumChannels(), sfSource.GetLength(), m_fSampleRate );
+		ITASampleFrame::write( sfSource, sfSource.GetLength() );
+		return;
+	}
+
+	const float fSRCRation = GetSampleRate() / fSourceSampleRate;
+	const int iTargetLength = (int) ceil( sfSource.GetLength() * fSRCRation ); // @tbd test!
+	Init( sfSource.GetNumChannels(), iTargetLength, m_fSampleRate );
+
+	const int iConverter = SRC_SINC_MEDIUM_QUALITY;
+	for( int i = 0; i < sfSource.GetNumChannels(); i++ )
+	{
+		int iSRCError;
+		SRC_STATE* pSRCStace = src_new( iConverter, sfSource.GetNumChannels(), &iSRCError );
+		if( pSRCStace == nullptr )
+			ITA_EXCEPT_INVALID_PARAMETER( "Could not create sample rate converter, samplerate error was: " + std::string( src_strerror( iSRCError ) ) );
+		
+		SRC_DATA oSRCData;
+		oSRCData.data_in = sfSource[ i ].GetData();
+		oSRCData.data_out = ( *this )[ i ].GetData();
+		oSRCData.input_frames = 1;
+		oSRCData.output_frames = 1;
+		oSRCData.src_ratio = fSRCRation;
+		if( ( iSRCError = src_process( pSRCStace, &oSRCData ) ) != 0 )
+			ITA_EXCEPT_INVALID_PARAMETER( "Could not convert sample rate: " + std::string( src_strerror( iSRCError ) ) );
+
+		src_delete( pSRCStace );
+	}
+}
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