diff -r 000000000000 -r 40261b775718 mmlibs/mmfw/src/Plugin/Codec/audio/MMFCodecBaseDefinitions.cpp --- /dev/null Thu Jan 01 00:00:00 1970 +0000 +++ b/mmlibs/mmfw/src/Plugin/Codec/audio/MMFCodecBaseDefinitions.cpp Tue Feb 02 01:56:55 2010 +0200 @@ -0,0 +1,339 @@ +// Copyright (c) 1997-2009 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 "MMFCodecBaseDefinitions.h" +#include "MMFAudioCodecBase.h" +#include + +// Base of Audio codecs +// These T Classes are "wrapped" by derived MMFCodecs, not exposed directly. + + +void Panic(TInt aPanicCode) + { + _LIT(KMMFCodecBaseDefinitionsPanicCategory, "MMFCodecBaseDefinitions"); + User::Panic(KMMFCodecBaseDefinitionsPanicCategory, aPanicCode); + } + + +void TMMFImaAdpcmBaseCodecOld::ResetBuffer() + { + iBufferStep = ETrue; + iBuffer = 0; + } + +TBool TMMFImaAdpcmBaseCodecOld::OutputStep() + { + return !iBufferStep; + } + +void TMMFImaAdpcmTo16PcmCodecOld::Convert(TUint8* aSrc, TUint8* aDst, TInt aSamples) + { + TInt delta; // Current adpcm output value + TInt step; // Stepsize + TInt valpred; // Predicted value + TInt vpdiff; // Current change to valpred + TInt index; // Current step change index + + TInt channelCount=16;//for stereo only + + aSamples*=iChannels; + + //Read first sample and index from block header + iState[0].iPredicted = *aSrc++; + iState[0].iPredicted |= STATIC_CAST(TInt16, ((*aSrc++) << 8)); + iState[0].iIndex = *aSrc++; + + aSrc++; //skip reserved header byte + + valpred = iState[0].iPredicted; + index = iState[0].iIndex; + TUint8* dst=aDst; + + //Write first sample to dest + *aDst++ = STATIC_CAST( TUint8, valpred); + *aDst++ = STATIC_CAST( TUint8, valpred >> 8); + dst += 2; + aSamples --; + + if (iChannels==2) + { + iState[1].iPredicted = *aSrc++; + iState[1].iPredicted |= STATIC_CAST(TInt16, ((*aSrc++) << 8)); + iState[1].iIndex = *aSrc++; + aSrc++; + + *aDst++ = STATIC_CAST( TUint8, iState[1].iPredicted); + *aDst++ = STATIC_CAST( TUint8, iState[1].iPredicted >> 8); + dst += 2; + aSamples --; + } + + for ( ; aSamples > 0 ; aSamples-- ) + { + // Step 1 - get the delta value + if (iBufferStep) + { + iBuffer = *aSrc++; + delta = iBuffer & 0xf; + } + else + { + delta = (iBuffer >> 4) & 0xf; + } + + iBufferStep = !iBufferStep; + + ASSERT(index >= 0); + step = iStepSizeTable[index]; + + vpdiff = step>>3; + if ( delta & 4 ) + vpdiff += step; + if ( delta & 2 ) + vpdiff += step>>1; + if ( delta & 1 ) + vpdiff += step>>2; + + if ( delta & 8 ) + valpred -= vpdiff; + else + valpred += vpdiff; + + if ( valpred > (KClamp - 1) ) + valpred = (KClamp - 1); + else if ( valpred < -KClamp ) + valpred = -KClamp; + + index += iIndexTable[delta]; + if ( index < 0 ) + index = 0; + if ( index > KMaxImaAdpcmTableEntries ) + index = KMaxImaAdpcmTableEntries; + + *dst++ = STATIC_CAST( TUint8, valpred&KAndMask8bit); + *dst++ = STATIC_CAST( TUint8, (valpred>>8)&KAndMask8bit); + + if (iChannels==2) + { + dst+=2; + if (--channelCount == 8) + { + dst=aDst+2; //right channel + iState[0].iPredicted=STATIC_CAST(TInt16, valpred); + iState[0].iIndex=STATIC_CAST(TUint8,index); + valpred = iState[1].iPredicted; + index = iState[1].iIndex; + } + else + { + if (!channelCount) + { + aDst+=32; + dst=aDst; + channelCount=16; + iState[1].iPredicted=STATIC_CAST(TInt16, valpred); + iState[1].iIndex=STATIC_CAST(TUint8, index); + valpred = iState[0].iPredicted; + index = iState[0].iIndex; + } + } + } + } + if (iChannels==1) + { + iState[0].iPredicted=STATIC_CAST(TInt16,valpred); + iState[0].iIndex=STATIC_CAST(TUint8,index); + } + } + +void TMMF16PcmToImaAdpcmCodecOld::Convert(TUint8* aSrc, TUint8* aDst, TInt aSamples) + { + TInt val; // Current input sample value + TInt sign; // Current adpcm sign bit + TInt delta; // Current adpcm output value + TInt diff; // Difference between val and valprev + TInt step; // Stepsize + TInt valpred; // Predicted value + TInt vpdiff; // Current change to valpred + TInt index; // Current step change index + + TInt16* srcPtr=REINTERPRET_CAST(TInt16*, aSrc); + TInt16* src=srcPtr; + + TInt bufferCount=16;//for stereo only + + if (iChannels==2) + { + aSamples*=2; + iBufferStep=ETrue; + } + + iState[0].iPredicted = *aSrc++; + iState[0].iPredicted |= STATIC_CAST(TInt16, ((*aSrc++) << 8)); + + valpred = iState[0].iPredicted; + index = iState[0].iIndex; + ASSERT(index >= 0); + step = iStepSizeTable[index]; + + //Write block header + *aDst++ = STATIC_CAST( TUint8, valpred); + *aDst++ = STATIC_CAST( TUint8, valpred >> 8); + *aDst++ = STATIC_CAST( TUint8, index); + *aDst++ = 0; //reserved byte + src++; + aSamples --; + + if (iChannels==2) + { + iState[1].iPredicted = *aSrc++; + iState[1].iPredicted |= STATIC_CAST(TInt16, ((*aSrc++) << 8)); + + //Write header for second channel + *aDst++ = STATIC_CAST( TUint8, iState[1].iPredicted); + *aDst++ = STATIC_CAST( TUint8, iState[1].iPredicted >> 8); + *aDst++ = STATIC_CAST( TUint8, iState[1].iIndex); + *aDst++ = 0; + src ++; + aSamples --; + } + + for (; aSamples > 0; aSamples--) + { + val = *src; + src += iChannels; + + ASSERT(index >= 0); + step = iStepSizeTable[index]; + + // Step 1 - compute difference with previous value + diff = val - valpred; + sign = (diff < 0) ? 8 : 0; + if ( sign ) diff = (-diff); + + // Step 2 - Divide and clamp + // Note: + // This code *approximately* computes: + // delta = diff*4/step; + // vpdiff = (delta+0.5)*step/4; + // but in shift step bits are dropped. The net result of this is + // that even if you have fast mul/div hardware you cannot put it to + // good use since the fixup would be too expensive. + // + delta = 0; + vpdiff = (step >> 3); + + if ( diff >= step ) + { + delta = 4; + diff -= step; + vpdiff += step; + } + step >>= 1; + if ( diff >= step ) + { + delta |= 2; + diff -= step; + vpdiff += step; + } + step >>= 1; + if ( diff >= step ) + { + delta |= 1; + vpdiff += step; + } + + // Step 3 - Update previous value + if ( sign ) + valpred -= vpdiff; + else + valpred += vpdiff; + + // Step 4 - Clamp previous value to 16 bits + if ( valpred > KClamp - 1 ) + valpred = KClamp - 1; + else if ( valpred < - KClamp ) + valpred = - KClamp; + + // Step 5 - Assemble value, update index and step values + delta |= sign; + + index += iIndexTable[delta]; + if ( index < 0 ) index = 0; + if ( index > 88 ) index = 88; + + // Step 6 - Output value + if (iBufferStep) + iBuffer = delta & 0x0f; + else + *aDst++ = STATIC_CAST( TInt8, ((delta << 4) & 0xf0) | iBuffer); + + iBufferStep = !iBufferStep; + + if (iChannels==2) + { + if (--bufferCount==8) + { + src=srcPtr+1; //right channel + iState[0].iPredicted = STATIC_CAST(TInt16, valpred); + iState[0].iIndex = STATIC_CAST(TUint8, index); + valpred = iState[1].iPredicted; + index = iState[1].iIndex; + } + else + { + if (!bufferCount) + { + iState[1].iPredicted = STATIC_CAST(TInt16, valpred); + iState[1].iIndex = STATIC_CAST(TUint8, index); + valpred = iState[0].iPredicted; + index = iState[0].iIndex; + bufferCount=16; + srcPtr+=16;//32bytes + src=srcPtr; + } + } + } + } + + if (iChannels==1) + { + iState[0].iPredicted = STATIC_CAST(TInt16, valpred); + iState[0].iIndex = STATIC_CAST(TUint8, index); + } + } + +// IMA-ADPCM step variation table +const TInt TMMFImaAdpcmBaseCodecOld::iIndexTable[16] = + { + -1, -1, -1, -1, 2, 4, 6, 8, + -1, -1, -1, -1, 2, 4, 6, 8 + }; + +const TInt TMMFImaAdpcmBaseCodecOld::iStepSizeTable[89] = + { + 7, 8, 9, 10, 11, 12, 13, 14, 16, 17, + 19, 21, 23, 25, 28, 31, 34, 37, 41, 45, + 50, 55, 60, 66, 73, 80, 88, 97, 107, 118, + 130, 143, 157, 173, 190, 209, 230, 253, 279, 307, + 337, 371, 408, 449, 494, 544, 598, 658, 724, 796, + 876, 963, 1060, 1166, 1282, 1411, 1552, 1707, 1878, 2066, + 2272, 2499, 2749, 3024, 3327, 3660, 4026, 4428, 4871, 5358, + 5894, 6484, 7132, 7845, 8630, 9493, 10442, 11487, 12635, 13899, + 15289, 16818, 18500, 20350, 22385, 24623, 27086, 29794, 32767 + }; + +