--- /dev/null Thu Jan 01 00:00:00 1970 +0000
+++ b/videoeditorengine/audioeditorengine/src/RateConverter.cpp Fri Jan 29 14:08:33 2010 +0200
@@ -0,0 +1,503 @@
+/*
+* 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:
+*
+*/
+
+
+
+#include "RateConverter.h"
+
+
+// CONSTANTS
+
+
+
+// MACROS
+
+// Debug print macro
+#if defined _DEBUG
+#include <e32svr.h>
+#define PRINT(x) RDebug::Print x;
+#else
+#define PRINT(x)
+#endif
+
+// -----------------------------------------------------------------------------
+// CRateConverter::NewL
+// Two-phased constructor.
+// -----------------------------------------------------------------------------
+//
+CRateConverter* CRateConverter::NewL(TInt aFromSampleRate, TInt aToSampleRate, TInt aFromChannels, TInt aToChannels)
+ {
+ CRateConverter* self = NewLC(aFromSampleRate, aToSampleRate, aFromChannels, aToChannels);
+ CleanupStack::Pop(self);
+ return self;
+ }
+
+// -----------------------------------------------------------------------------
+// CRateConverter::NewLC
+// Two-phased constructor.
+// -----------------------------------------------------------------------------
+//
+CRateConverter* CRateConverter::NewLC(TInt aFromSampleRate, TInt aToSampleRate, TInt aFromChannels, TInt aToChannels)
+ {
+ CRateConverter* self = new (ELeave) CRateConverter(aFromSampleRate, aToSampleRate, aFromChannels, aToChannels);
+ CleanupStack::PushL(self);
+ self->ConstructL();
+ return self;
+ }
+
+// -----------------------------------------------------------------------------
+// CRateConverter::ConstructL
+// Symbian 2nd phase constructor can leave.
+// -----------------------------------------------------------------------------
+//
+void CRateConverter::ConstructL()
+ {
+ }
+
+// -----------------------------------------------------------------------------
+// CRateConverter::CRateConverter
+// C++ default constructor can NOT contain any code, that
+// might leave.
+// -----------------------------------------------------------------------------
+//
+CRateConverter::CRateConverter(TInt aFromSampleRate, TInt aToSampleRate, TInt aFromChannels, TInt aToChannels)
+ : iFromSampleRate(aFromSampleRate), iToSampleRate(aToSampleRate),
+ iFromChannels(aFromChannels), iToChannels(aToChannels)
+ {
+ // Select the smaller of the two
+ iChannels = (iFromChannels < iToChannels) ? iFromChannels : iToChannels;
+ }
+
+// ---------------------------------------------------------
+// CRateConverter::~CRateConverter
+// Destructor
+// ---------------------------------------------------------
+//
+CRateConverter::~CRateConverter()
+ {
+ if (iChild)
+ {
+ delete iChild;
+ iChild = NULL;
+ }
+
+ if (iConverter)
+ {
+ delete iConverter;
+ iConverter = NULL;
+ }
+
+ if (iInBuffer)
+ {
+ for (TInt i = 0; (i < iChannels) && iInBuffer[i]; i++)
+ {
+ User::Free(iInBuffer[i]);
+ iInBuffer[i] = NULL;
+ }
+ User::Free(iInBuffer);
+ iInBuffer = NULL;
+ }
+
+ if (iOutBuffer)
+ {
+ for (TInt i = 0; (i < iChannels) && iOutBuffer[i]; i++)
+ {
+ User::Free(iOutBuffer[i]);
+ iOutBuffer[i] = NULL;
+ }
+ User::Free(iOutBuffer);
+ iOutBuffer = NULL;
+ }
+
+ if (iScratchBuffer)
+ {
+ User::Free(iScratchBuffer);
+ iScratchBuffer = NULL;
+ }
+ }
+
+// -----------------------------------------------------------------------------
+// CRateConverter::InitL
+// Initialize the rate converter
+// -----------------------------------------------------------------------------
+//
+TBool CRateConverter::InitL(TInt aInputBufferSize)
+ {
+ PRINT((_L("CRateConverter::InitL() In")));
+
+ if (iConverter)
+ {
+ PRINT((_L("CRateConverter::InitL() Already initialized")));
+ return EFalse;
+ }
+
+ // Check that the input and output are either mono or stereo
+ if ( ((iFromChannels != 1) && (iFromChannels != 2)) ||
+ ((iToChannels != 1) && (iToChannels != 2)) )
+ {
+ PRINT((_L("CRateConverter::InitL() Only mono and stereo are supported for input/output")));
+ return EFalse;
+ }
+
+ if (iFromSampleRate == iToSampleRate)
+ {
+ // No sample rate conversion needed so do only channel conversion
+ iInputBlockSize = iOuputBlockSize = aInputBufferSize;
+
+ PRINT((_L("CRateConverter::InitL() Out")));
+ return ETrue;
+ }
+
+ if (!DoInitL(aInputBufferSize))
+ {
+ return EFalse;
+ }
+
+ // Allocate internal input buffer
+ iInBuffer = (TInt16**) User::AllocL(iChannels * sizeof(TInt16*));
+
+ for (TInt i = 0; i < iChannels; i++)
+ {
+ iInBuffer[i] = (TInt16*) User::AllocL(iInputBlockSize * sizeof(TInt16));
+ }
+
+ PRINT((_L("CRateConverter::InitL() Out")));
+ return ETrue;
+ }
+
+// -----------------------------------------------------------------------------
+// CRateConverter::DoInitL
+// Does internal initialization
+// -----------------------------------------------------------------------------
+//
+TBool CRateConverter::DoInitL(TInt aInputBufferSize)
+ {
+ iInputBlockSize = aInputBufferSize;
+
+ // Supported direct conversions:
+ //
+ // 16000 -> 8000: /2
+ // 24000 -> 8000: /3
+ //
+ // 8000 -> 16000: *2
+ // 32000 -> 16000: /2
+ // 48000 -> 16000: /3
+ //
+ // 16000 -> 48000: *3
+ // 24000 -> 48000: *2
+ // 32000 -> 48000: *3/2
+ // 44100 -> 48000: *i
+
+ // Try to use direct conversion
+ iConverter = RESAMPLER_RateConversionInputDrivenInt16::New(iFromSampleRate, iToSampleRate, iChannels);
+
+ if (!iConverter)
+ {
+ // Direct conversion is not possible so multi phase conversion is needed
+
+ // Conversions are done in the following order:
+ // (*i means 160/147 conversion)
+ //
+ // 11025 -> 8000: *i *2 /3 (three phase)
+ // 22050 -> 8000: *i /3 (two phase)
+ // 32000 -> 8000: /2 /2 (two phase)
+ // 44100 -> 8000: *i /3 /2 (three phase)
+ // 48000 -> 8000: /3 /2 (two phase)
+ //
+ // 11025 -> 16000: *2 *2 *i /3 (four phase)
+ // 22050 -> 16000: *2 *i /3 (three phase)
+ // 24000 -> 16000: *2 /3 (two phase)
+ // 44100 -> 16000: *i /3 (two phase)
+ //
+ // 8000 -> 48000: *3 *2 (two phase)
+ // 11025 -> 48000: *2 *2 *i (three phase)
+ // 22050 -> 48000: *2 *i (two phase)
+
+ // Check the last phase in the chain and make the decision where the child should convert
+ if( ((iToSampleRate == 8000) && ((iFromSampleRate == 11025) || (iFromSampleRate == 22050))) ||
+ (iToSampleRate == 16000) )
+ {
+ // Last phase is /3 so the child converter needs to do
+ // conversion from iFromSampleRate to iToSampleRate*3
+
+ // Create the child converter
+ iChild = CRateConverter::NewL(iFromSampleRate, iToSampleRate * 3, iChannels, iChannels);
+ if (!iChild->DoInitL(aInputBufferSize))
+ {
+ return EFalse;
+ }
+
+ // Update sample rates and buffer sizes
+ iFromSampleRate = iToSampleRate * 3;
+ aInputBufferSize = iChild->GetOutputBufferSize();
+
+ // Try to create our converter
+ iConverter = RESAMPLER_RateConversionInputDrivenInt16::New(iFromSampleRate, iToSampleRate, iChannels);
+ if (!iConverter)
+ {
+ return EFalse;
+ }
+ }
+ else if( (iToSampleRate == 8000) )
+ {
+ // Last phase is /2 so the child converter needs to do
+ // conversion from iFromSampleRate to iToSampleRate*2
+
+ // Create the child converter
+ iChild = CRateConverter::NewL(iFromSampleRate, iToSampleRate * 2, iChannels, iChannels);
+ if (!iChild->DoInitL(aInputBufferSize))
+ {
+ return EFalse;
+ }
+
+ // Update sample rates and buffer sizes
+ iFromSampleRate = iToSampleRate * 2;
+ aInputBufferSize = iChild->GetOutputBufferSize();
+
+ // Try to create our converter
+ iConverter = RESAMPLER_RateConversionInputDrivenInt16::New(iFromSampleRate, iToSampleRate, iChannels);
+ if (!iConverter)
+ {
+ return EFalse;
+ }
+ }
+ else if( ((iToSampleRate == 48000) && ((iFromSampleRate == 11025) || (iFromSampleRate == 22050))) )
+ {
+ // Last phase is *i so the child converter needs to do
+ // conversion from iFromSampleRate to 44100
+
+ // Create the child converter
+ iChild = CRateConverter::NewL(iFromSampleRate, 44100, iChannels, iChannels);
+ if (!iChild->DoInitL(aInputBufferSize))
+ {
+ return EFalse;
+ }
+
+ // Update sample rates and buffer sizes
+ iFromSampleRate = 44100;
+ aInputBufferSize = iChild->GetOutputBufferSize();
+
+ // Try to create our converter
+ iConverter = RESAMPLER_RateConversionInputDrivenInt16::New(iFromSampleRate, iToSampleRate, iChannels);
+ if (!iConverter)
+ {
+ return EFalse;
+ }
+ }
+ else if( ((iFromSampleRate == 11025) && ((iToSampleRate == 24000) || (iToSampleRate == 44100))) ||
+ ((iFromSampleRate == 8000) && (iToSampleRate == 48000)) )
+ {
+ // Last phase is *2 so the child converter needs to do
+ // conversion from iFromSampleRate to iToSampleRate/2
+
+ // Create the child converter
+ iChild = CRateConverter::NewL(iFromSampleRate, iToSampleRate / 2, iChannels, iChannels);
+ if (!iChild->DoInitL(aInputBufferSize))
+ {
+ return EFalse;
+ }
+
+ // Update sample rates and buffer sizes
+ iFromSampleRate = iToSampleRate / 2;
+ aInputBufferSize = iChild->GetOutputBufferSize();
+
+ // Try to create our converter
+ iConverter = RESAMPLER_RateConversionInputDrivenInt16::New(iFromSampleRate, iToSampleRate, iChannels);
+ if (!iConverter)
+ {
+ return EFalse;
+ }
+ }
+ else
+ {
+ // We don't know how to convert, probably this is an unsupported conversion
+ PRINT((_L("CRateConverter::DoInitL() Can not convert from %d to %d"), iFromSampleRate, iToSampleRate));
+ return EFalse;
+ }
+ }
+
+ if (!iConverter->InitInputDriven())
+ {
+ PRINT((_L("CRateConverter::InitL() Failed to initialize converter")));
+ return EFalse;
+ }
+
+ // Set scratch memory buffer for converter
+ size_t scratchBufferSize = iConverter->ScratchMemoryNeedInputDriven(aInputBufferSize);
+
+ if (scratchBufferSize == 0)
+ {
+ PRINT((_L("CRateConverter::InitL() Scratch buffer size is too big")));
+ return EFalse;
+ }
+
+ iScratchBuffer = (TInt8*) User::AllocL(scratchBufferSize);
+ iConverter->SetScratchBufferInputDriven((char *)iScratchBuffer);
+
+ iOuputBlockSize = iConverter->MaxOutputSampleCount(aInputBufferSize);
+
+ // Allocate internal output buffer
+ iOutBuffer = (TInt16**) User::AllocL(iChannels * sizeof(TInt16*));
+
+ for (TInt i = 0; i < iChannels; i++)
+ {
+ iOutBuffer[i] = (TInt16*) User::AllocL(iOuputBlockSize * sizeof(TInt16));
+ }
+
+ iConverter->SetQualityInputDriven(RESAMPLER_RATE_CONVERSION_QUALITY_STANDARD);
+
+ PRINT((_L("CRateConverter::DoInitL() Convert %d -> %d Hz, %d -> %d channels"), iFromSampleRate, iToSampleRate, iFromChannels, iToChannels));
+
+ PRINT((_L("CRateConverter::DoInitL() Input buffer %d, Output buffer %d"), iInputBlockSize, iOuputBlockSize));
+
+ return ETrue;
+ }
+
+// -----------------------------------------------------------------------------
+// CRateConverter::ConvertBufferL
+// Does rate and channel conversion for given buffer
+// -----------------------------------------------------------------------------
+//
+TInt CRateConverter::ConvertBufferL(TInt16* aInput, TInt16* aOutput, TInt aInputSampleCount)
+ {
+ if (iFromSampleRate == iToSampleRate)
+ {
+ // No sample rate conversion needed
+ if (iFromChannels == iToChannels)
+ {
+ // No channel conversion needed either so copy input directly to output
+ Mem::Copy(aOutput, aInput, aInputSampleCount * 2 * iFromChannels);
+ }
+ else if (iFromChannels == 2)
+ {
+ // Convert stereo to mono
+ for (TInt i = 0; i < aInputSampleCount; ++i)
+ {
+ // Average left and right samples
+ aOutput[i] = (aInput[2*i + 0] + aInput[2*i + 1]) >> 1;
+ }
+ }
+ else if (iToChannels == 2)
+ {
+ // Convert mono to stereo
+ for (TInt i = 0; i < aInputSampleCount; ++i)
+ {
+ // Duplicate left channel to right channel
+ aOutput[2*i + 0] = aInput[i];
+ aOutput[2*i + 1] = aInput[i];
+ }
+ }
+
+ return aInputSampleCount;
+ }
+
+ if (!iConverter)
+ {
+ PRINT((_L("CRateConverter::ConvertBufferL() Not initialized")));
+ User::Leave(KErrNotReady);
+ }
+
+ if (aInputSampleCount > iInputBlockSize)
+ {
+ PRINT((_L("CRateConverter::ConvertBufferL() Too many input samples")));
+ User::Leave(KErrArgument);
+ }
+
+ // Copy to input buffers and do channel conversion if needed
+ if (iChannels == 2)
+ {
+ // Both channels are stereo so copy both channels to own buffers
+ for (TInt i = 0; i < aInputSampleCount; ++i)
+ {
+ iInBuffer[0][i] = aInput[2*i + 0];
+ iInBuffer[1][i] = aInput[2*i + 1];
+ }
+ }
+ else if (iFromChannels == 2)
+ {
+ // Source is stereo so convert stereo to mono
+ for (TInt i = 0; i < aInputSampleCount; ++i)
+ {
+ // Average left and right samples
+ iInBuffer[0][i] = (aInput[2*i + 0] + aInput[2*i + 1]) >> 1;
+ }
+ }
+ else
+ {
+ // Source is mono so copy it directly
+ Mem::Copy(iInBuffer[0], aInput, aInputSampleCount * 2);
+ }
+
+ TInt outputSampleCount = DoConvertL(iInBuffer, aInputSampleCount);
+
+ // Copy to output buffers and do channel conversion if needed
+ if (iChannels == 2)
+ {
+ // Both channels are stereo so copy both channels to own buffers
+ for (TInt i = 0; i < outputSampleCount; ++i)
+ {
+ aOutput[2*i + 0] = iOutBuffer[0][i];
+ aOutput[2*i + 1] = iOutBuffer[1][i];
+ }
+ }
+ else if (iToChannels == 2)
+ {
+ // Ouput is stereo so convert mono to stereo
+ for (TInt i = 0; i < outputSampleCount; ++i)
+ {
+ // Duplicate left channel to right channel
+ aOutput[2*i + 0] = iOutBuffer[0][i];
+ aOutput[2*i + 1] = iOutBuffer[0][i];
+ }
+ }
+ else
+ {
+ // Output is mono so copy it directly
+ Mem::Copy(aOutput, iOutBuffer[0], outputSampleCount * 2);
+ }
+
+ PRINT((_L("CRateConverter::ConvertBufferL() Output %d samples"), outputSampleCount));
+
+ return outputSampleCount;
+ }
+
+// -----------------------------------------------------------------------------
+// CRateConverter::DoConvertL
+// Does the actual conversion
+// -----------------------------------------------------------------------------
+//
+TInt CRateConverter::DoConvertL(TInt16** aInput, TInt aInputSampleCount)
+ {
+ if (iChild)
+ {
+ // If we have a child then we need to do a multi phase conversion
+ TInt tempSampleCount = iChild->DoConvertL(aInput, aInputSampleCount);
+
+ // Get pointer to child's output and use it as an input
+ TInt16** tempBuf = iChild->GetOutputBuffer();
+
+ return iConverter->ProcessFromInput(iOutBuffer, tempBuf, tempSampleCount);
+ }
+ else
+ {
+ // Otherwise process directly from input to output
+ return iConverter->ProcessFromInput(iOutBuffer, aInput, aInputSampleCount);
+ }
+ }
+
+