--- /dev/null Thu Jan 01 00:00:00 1970 +0000
+++ b/videoeditorengine/audioeditorengine/inc/RateConverter.h Fri Jan 29 14:08:33 2010 +0200
@@ -0,0 +1,139 @@
+/*
+* Copyright (c) 2010 Ixonos Plc.
+* All rights reserved.
+* This component and the accompanying materials are made available
+* under the terms of the "Eclipse Public License v1.0"
+* which accompanies this distribution, and is available
+* at the URL "http://www.eclipse.org/legal/epl-v10.html".
+*
+* Initial Contributors:
+* Nokia Corporation - Initial contribution
+*
+* Contributors:
+* Ixonos Plc
+*
+* Description:
+*
+*/
+
+
+
+#ifndef __CRateConverter_H__
+#define __CRateConverter_H__
+
+#include <e32base.h>
+
+#include "resampler_rate_conversion_input_driven_int16.h"
+
+class CRateConverter : public CBase
+ {
+
+public:
+
+ /*
+ * Symbian constructors
+ *
+ */
+ static CRateConverter* NewL(TInt aFromSampleRate, TInt aToSampleRate, TInt aFromChannels, TInt aToChannels);
+
+ static CRateConverter* NewLC(TInt aFromSampleRate, TInt aToSampleRate, TInt aFromChannels, TInt aToChannels);
+
+ /*
+ * Destructor
+ */
+ ~CRateConverter();
+
+ /*
+ * Initialize the rate converter
+ *
+ * @param aInputBufferSize Max size of the input buffer in number of samples
+ * @return ETrue if successful
+ *
+ */
+ TBool InitL(TInt aInputBufferSize);
+
+ /*
+ * Does rate and channel conversion for given buffer
+ *
+ * @param aInput Pointer to input buffer (16-bit samples)
+ * @param aOutput Pointer to output buffer (16-bit samples)
+ * @param aInputSampleCount Number of samples in the input buffer
+ * @return Number of samples in the output buffer
+ */
+ TInt ConvertBufferL(TInt16* aInput, TInt16* aOutput, TInt aInputSampleCount);
+
+ /*
+ * Returns the size of the output buffer
+ *
+ */
+ TInt GetOutputBufferSize() { return iOuputBlockSize; }
+
+
+protected:
+
+ // constructL
+ void ConstructL();
+
+ // C++ constructor
+ CRateConverter(TInt aFromSampleRate, TInt aToSampleRate, TInt aFromChannels, TInt aToChannels);
+
+private:
+
+ /*
+ * Does internal initialization
+ *
+ */
+ TBool DoInitL(TInt aInputBufferSize);
+
+ /*
+ * Does the actual conversion
+ *
+ */
+ TInt DoConvertL(TInt16** aInput, TInt aInputSampleCount);
+
+ /*
+ * Returns pointer to the output buffer
+ *
+ */
+ TInt16** GetOutputBuffer() { return iOutBuffer; }
+
+private:
+
+ // Another converter incase two phase converting is needed
+ CRateConverter* iChild;
+
+ // The actual converter
+ RESAMPLER_RateConversionInputDrivenInt16* iConverter;
+
+ // Input data for rate converter
+ TInt16** iInBuffer;
+
+ // Output data from rate converter
+ TInt16** iOutBuffer;
+
+ // Temp buffer used by converter
+ TInt8* iScratchBuffer;
+
+ // Size of the input buffer
+ TInt iInputBlockSize;
+
+ // Size of the output buffer
+ TInt iOuputBlockSize;
+
+ // Number of channels used in converter
+ TInt iChannels;
+
+ // Samplerate to convert from
+ TInt iFromSampleRate;
+
+ // Samplerate to convert to
+ TInt iToSampleRate;
+
+ // Number of channels in input
+ TInt iFromChannels;
+
+ // Number of channels in output
+ TInt iToChannels;
+ };
+
+#endif