--- /dev/null Thu Jan 01 00:00:00 1970 +0000
+++ b/mmlibs/mmfw/src/server/BaseClasses/Mmfutilities.cpp Thu Oct 07 22:34:12 2010 +0100
@@ -0,0 +1,331 @@
+// Copyright (c) 2002-2009 Nokia Corporation and/or its subsidiary(-ies).
+// All rights reserved.
+// This component and the accompanying materials are made available
+// under the terms of "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:
+//
+// Description:
+//
+
+#include "MmfUtilities.h"
+#include "mmfutilitiespriv.h"
+#include <mmf/utils/rateconvert.h>
+
+const TInt KMaxInt16Bit = 65536 ; //Maximum for a 16bit int
+
+EXPORT_C CMMFChannelAndSampleRateConverterFactory::~CMMFChannelAndSampleRateConverterFactory()
+ {
+ delete iConverter;
+ }
+
+
+EXPORT_C CMMFChannelAndSampleRateConverter* CMMFChannelAndSampleRateConverterFactory::CreateConverterL(TInt aFromRate,TInt aFromChannels,
+ TInt aToRate,TInt aToChannels)
+ {
+ if(aFromRate<0 || aFromChannels<0 || aToRate<0 || aToChannels<0)
+ {
+ User::Leave(KErrArgument);
+ }
+
+ iFromRate=aFromRate;
+ iToRate=aToRate;
+ iFromChannels=aFromChannels;
+ iToChannels=aToChannels;
+ return CreateConverterL();
+ }
+
+EXPORT_C CMMFChannelAndSampleRateConverter* CMMFChannelAndSampleRateConverterFactory::CreateConverterL()
+ {
+ if (iConverter
+ &&(iFromRate==iConverter->iFromRate)
+ &&(iToRate==iConverter->iToRate)
+ &&(iFromChannels==iConverter->iFromChannels)
+ &&(iToChannels==iConverter->iToChannels))
+ return iConverter;
+
+ delete iConverter;
+ iConverter=NULL;
+
+ iConverter = CMMFForwardingChannelAndSampleRateConverter::NewL(iFromRate, iFromChannels, iToRate, iToChannels);
+
+ return iConverter;
+ }
+
+// SetRates kept for BC reasons - populates publically visible properties
+
+void CMMFChannelAndSampleRateConverter::SetRates(TInt aFromRate,TInt aFromChannels,
+ TInt aToRate,TInt aToChannels)
+ {
+ iFromRate=aFromRate;
+ iToRate=aToRate;
+ iFromChannels=aFromChannels;
+ iToChannels=aToChannels;
+
+ iRatio = (TReal)aFromRate / (TReal)aToRate;
+
+ TInt quotient = (TInt)iRatio;
+ TReal remainder = iRatio - (TReal)quotient;
+ iFraction = quotient * KMaxInt16Bit + (TInt32)(remainder * KMaxInt16Bit);
+
+ Reset();
+ }
+
+//
+// Forwarding converter - adapt to the implementation in audioutils.
+//
+
+CMMFForwardingChannelAndSampleRateConverter* CMMFForwardingChannelAndSampleRateConverter::NewL(TInt aFromRate,
+ TInt aFromChannels,
+ TInt aToRate,
+ TInt aToChannels)
+ {
+ CMMFForwardingChannelAndSampleRateConverter* self = new (ELeave) CMMFForwardingChannelAndSampleRateConverter;
+ CleanupStack::PushL(self);
+ self->ConstructL(aFromRate,aFromChannels,aToRate,aToChannels);
+ CleanupStack::Pop(self);
+ return self;
+ }
+
+CMMFForwardingChannelAndSampleRateConverter::CMMFForwardingChannelAndSampleRateConverter()
+ {
+ }
+
+void CMMFForwardingChannelAndSampleRateConverter::ConstructL(TInt aFromRate,
+ TInt aFromChannels,
+ TInt aToRate,
+ TInt aToChannels)
+ {
+ SetRates(aFromRate, aFromChannels, aToRate, aToChannels);
+ // delib called before iRealConverter created. Reset() will be no-op.
+ // this is preserved solely to keep BC with original API that exposes too much
+ iRealConverter = CChannelAndSampleRateConverter::CreateL(aFromRate,aFromChannels,aToRate,aToChannels);
+ }
+
+CMMFForwardingChannelAndSampleRateConverter::~CMMFForwardingChannelAndSampleRateConverter()
+ {
+ delete iRealConverter;
+ }
+
+TInt CMMFForwardingChannelAndSampleRateConverter::Convert(const CMMFDataBuffer& aSrcBuffer, CMMFDataBuffer& aDstBuffer)
+ {
+ TInt ignore = iRealConverter->Convert(aSrcBuffer.Data(), aDstBuffer.Data());
+ // CChannelAndSampleRateConverter returns the source length converted
+ // while the old API wants the destination generated, so change.
+ TInt result = aDstBuffer.Data().Length();
+ return result;
+ }
+
+void CMMFForwardingChannelAndSampleRateConverter::Reset()
+ {
+ // need to check iRealConverter created. Won't be true during construction
+ if (iRealConverter)
+ {
+ iRealConverter->Reset();
+ }
+ }
+
+TUint CMMFForwardingChannelAndSampleRateConverter::MaxConvertBufferSize(TUint aSrcBufferSize)
+ {
+ return TUint(iRealConverter->MaxConvertBufferSize(aSrcBufferSize));
+ }
+
+//
+// Old derivatives of CMMFChannelAndSampleRateConverter. These were previously returned by
+// CreateConverterL(). Kept for BC, but no longer used by main code.
+//
+
+TInt CMMFStereoToStereoRateConverter::Convert(const CMMFDataBuffer& aSrcBuffer, CMMFDataBuffer& aDstBuffer)
+ {
+ TInt32* aSrc = (TInt32*)aSrcBuffer.Data().Ptr();
+ TInt32* aDst = (TInt32*)aDstBuffer.Data().Ptr();
+ TUint aSamples = aSrcBuffer.Data().Length()/4;
+
+ TInt32* src = aSrc;
+ TInt32* dst = aDst;
+ TInt32* limit=src+aSamples;
+
+ // add left over from last buffer
+ TUint index = iIndex;
+ src = aSrc + (index>>16);
+
+ while(src<limit)
+ {
+ *dst++ = *src;
+ index += iFraction;
+ src = aSrc + (index>>16);
+ }
+
+ // get amount by which index exceeded end of buffer
+ // so that we can add it back to start of next buffer
+ iIndex = index - (aSamples << 16);
+
+ // return sample byte count and setup output buffer
+ TInt length = (dst-(TInt32*)aDst)*4; //dealing with 32bit values so multiply by 4 for bytes
+ aDstBuffer.Data().SetLength(length); //adjust length of destination buffer
+ return (length);
+ }
+
+TInt CMMFMonoToStereoRateConverter::Convert(const CMMFDataBuffer& aSrcBuffer, CMMFDataBuffer& aDstBuffer)
+ {
+ TInt16* aSrc = (TInt16*)aSrcBuffer.Data().Ptr();
+ TInt16* aDst = (TInt16*)aDstBuffer.Data().Ptr();
+ TUint aSamples = aSrcBuffer.Data().Length()/2;
+
+ TInt16* src = aSrc;
+ TInt16* dst = aDst;
+ TInt16* limit=aSrc+aSamples;
+
+ // add left over from last buffer
+ TUint index = iIndex;
+ src = aSrc + (index>>16);
+
+ while(src<limit)
+ {
+ *dst++ = *src;
+ *dst++ = *src;
+ index += iFraction;
+ src = aSrc + (index>>16);
+ }
+
+ // get amount by which index exceeded end of buffer
+ // so that we can add it back to start of next buffer
+ iIndex = index - (aSamples << 16);
+
+ // return sample byte count and setup output buffer
+ TInt length = (dst-aDst) * 2; // size in bytes
+ aDstBuffer.Data().SetLength(length); //adjust length of destination buffer
+ return (length);
+ }
+
+
+TUint CMMFMonoToStereoRateConverter::MaxConvertBufferSize(TUint aSrcBufferSize)
+ {
+ return aSrcBufferSize*2;
+ }
+
+
+
+TInt CMMFMonoToMonoRateConverter::Convert(const CMMFDataBuffer& aSrcBuffer, CMMFDataBuffer& aDstBuffer)
+ {
+ TInt16* aSrc = (TInt16*)aSrcBuffer.Data().Ptr();
+ TInt16* aDst = (TInt16*)aDstBuffer.Data().Ptr();
+ TUint aSamples = aSrcBuffer.Data().Length()/2;
+
+ TInt16* src = aSrc;
+ TInt16* dst = aDst;
+ TInt16* limit=aSrc+aSamples; //*2 ???
+
+ // add left over from last buffer
+ TUint index = iIndex;
+ src = aSrc + (index>>16);
+
+ while(src<limit)
+ {
+ *dst++ = *src;
+ index += iFraction;
+ src = aSrc + (index>>16);
+ }
+
+ // get amount by which index exceeded end of buffer
+ // so that we can add it back to start of next buffer
+ iIndex = index - (aSamples << 16);
+
+ // return sample byte count and setup output buffer
+ TInt length = (dst-aDst)*2; // size in bytes
+ aDstBuffer.Data().SetLength(length); //adjust length of destination buffer
+ return (length);
+ }
+
+//This method takes the left and right sample of interleaved PCM and sums it, then divides by 2
+TInt CMMFStereoToMonoRateConverter::Convert(const CMMFDataBuffer& aSrcBuffer, CMMFDataBuffer& aDstBuffer)
+ {
+ TInt16* aSrc = (TInt16*)aSrcBuffer.Data().Ptr();
+ TInt16* aDst = (TInt16*)aDstBuffer.Data().Ptr();
+ TUint aSamples = aSrcBuffer.Data().Length()/4;
+
+ TInt16* src = aSrc;
+ TInt16* limit=aSrc+aSamples*2; //because 1 sample = two TInt16s
+
+ // add left over from last buffer
+ TUint index = iIndex;
+ src = aSrc + (index>>16)*2;
+
+ TInt length = 0;
+
+ while(src<limit)
+ {
+ *aDst++ = (TInt16)((src[0] + (src[1])) / 2);
+ index += iFraction;
+ src = aSrc + (index>>16)*2;
+ length++;
+ }
+ // get amount by which index exceeded end of buffer
+ // so that we can add it back to start of next buffer
+ iIndex = index - (aSamples << 16);
+
+ // return sample byte count and setup output buffer
+ aDstBuffer.Data().SetLength(length * 2); //adjust length of destination buffer
+ return (length);
+ }
+
+
+TUint CMMFStereoToMonoRateConverter::MaxConvertBufferSize(TUint aSrcBufferSize)
+ {
+ TUint size = aSrcBufferSize/2;
+ size += aSrcBufferSize & 1; //avoid round down error
+ return size;
+ }
+
+//This method takes the left and right sample of interleaved PCM and sums it, then divides by 2
+TInt CMMFStereoToMonoConverter::Convert(const CMMFDataBuffer& aSrcBuffer, CMMFDataBuffer& aDstBuffer)
+ {
+ TInt16* aSrc = (TInt16*)aSrcBuffer.Data().Ptr();
+ TInt16* aDst = (TInt16*)aDstBuffer.Data().Ptr();
+ TUint aSamples = aSrcBuffer.Data().Length()/4;
+ for (TUint i=0;i<aSamples;i++)
+ {
+ *aDst++ = (TInt16)((aSrc[0] + (aSrc[1])) / 2);
+ aSrc+=2;
+ }
+ aDstBuffer.Data().SetLength(aSamples*2); //adjust length of destination buffer
+ return aSamples*2;
+ }
+
+TUint CMMFStereoToMonoConverter::MaxConvertBufferSize(TUint aSrcBufferSize)
+ {
+ TUint size = aSrcBufferSize/2;
+ size += aSrcBufferSize & 1; //avoid round down error
+ return size;
+ }
+
+
+
+TInt CMMFMonoToStereoConverter::Convert(const CMMFDataBuffer& aSrcBuffer, CMMFDataBuffer& aDstBuffer)
+ {
+ TInt16* aSrc = (TInt16*)aSrcBuffer.Data().Ptr();
+ TInt16* aDst = (TInt16*)aDstBuffer.Data().Ptr();
+ TUint aSamples = aSrcBuffer.Data().Length()/2;
+ for (TUint i=0;i<aSamples;i++)
+ {
+ *aDst++ = *aSrc;
+ *aDst++ = *aSrc++;
+ }
+ aDstBuffer.Data().SetLength(aSamples*4); //adjust length of destination buffer
+ return aSamples*4;
+ }
+
+TUint CMMFMonoToStereoConverter::MaxConvertBufferSize(TUint aSrcBufferSize)
+ {
+ return aSrcBufferSize*2;
+ }
+
+
+
+
+