Symbian3/Examples/guid-6013a680-57f9-415b-8851-c4fa63356636/_m_m_f_ex_pcm8_to_pcm16_codec_8cpp_source.html
Week 32 contribution of PDK documentation content. See release notes for details. Fixes bug Bug 3582
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<h1>examples/Multimedia/MmfExCodec/MMFExPcm8ToPcm16Codec.cpp</h1><div class="fragment"><pre class="fragment"><a name="l00001"></a>00001 <span class="comment">// MMFExPcm8Pcm16Codec.cpp</span>
<a name="l00002"></a>00002 <span class="comment">// Copyright (c) 1997-2009 Nokia Corporation and/or its subsidiary(-ies).</span>
<a name="l00003"></a>00003 <span class="comment">// All rights reserved.</span>
<a name="l00004"></a>00004 <span class="comment">// This component and the accompanying materials are made available</span>
<a name="l00005"></a>00005 <span class="comment">// under the terms of "Eclipse Public License v1.0"</span>
<a name="l00006"></a>00006 <span class="comment">// which accompanies this distribution, and is available</span>
<a name="l00007"></a>00007 <span class="comment">// at the URL "http://www.eclipse.org/legal/epl-v10.html".</span>
<a name="l00008"></a>00008 <span class="comment">//</span>
<a name="l00009"></a>00009 <span class="comment">// Initial Contributors:</span>
<a name="l00010"></a>00010 <span class="comment">// Nokia Corporation - initial contribution.</span>
<a name="l00011"></a>00011 <span class="comment">//</span>
<a name="l00012"></a>00012 <span class="comment">// Contributors:</span>
<a name="l00013"></a>00013 <span class="comment">//</span>
<a name="l00014"></a>00014 <span class="comment">// Description:</span>
<a name="l00015"></a>00015 <span class="comment">//</span>
<a name="l00016"></a>00016
<a name="l00017"></a>00017 <span class="preprocessor">#include "MMFExPcm8ToPcm16Codec.h"</span>
<a name="l00018"></a>00018
<a name="l00019"></a>00019
<a name="l00020"></a>00020 <span class="comment">// Factory function</span>
<a name="l00021"></a>00021 CMMFCodec* CMMFExPcm8Pcm16Codec::NewL(TAny* )
<a name="l00022"></a>00022 {
<a name="l00023"></a>00023 <a class="code" href="class_c_m_m_f_ex_pcm8_pcm16_codec.html">CMMFExPcm8Pcm16Codec</a>* <span class="keyword">self</span>=<span class="keyword">new</span>(ELeave) <a class="code" href="class_c_m_m_f_ex_pcm8_pcm16_codec.html">CMMFExPcm8Pcm16Codec</a>();
<a name="l00024"></a>00024 <span class="keywordflow">return</span> <span class="keyword">self</span>;
<a name="l00025"></a>00025 }
<a name="l00026"></a>00026
<a name="l00027"></a>00027 <span class="comment">// Process source buffer and writes converted data to destination buffer</span>
<a name="l00028"></a>00028 <span class="comment">// The codec expands 1 byte to 2 bytes</span>
<a name="l00029"></a>00029 TCodecProcessResult CMMFExPcm8Pcm16Codec::ProcessL(<span class="keyword">const</span> CMMFBuffer& aSrc, CMMFBuffer& aDst)
<a name="l00030"></a>00030 {
<a name="l00031"></a>00031 TCodecProcessResult result;
<a name="l00032"></a>00032 result.iStatus = TCodecProcessResult::EProcessIncomplete;
<a name="l00033"></a>00033
<a name="l00034"></a>00034 <span class="comment">// cast from generic CMMFBuffer to CMMFDataBuffer</span>
<a name="l00035"></a>00035 iSrc = STATIC_CAST(<span class="keyword">const</span> CMMFDataBuffer*, &aSrc);
<a name="l00036"></a>00036 iDst = STATIC_CAST(CMMFDataBuffer*, &aDst);
<a name="l00037"></a>00037
<a name="l00038"></a>00038 <span class="keyword">const</span> TUint dstMaxLen = iDst->Data().MaxLength();
<a name="l00039"></a>00039 <span class="keywordflow">if</span> (!dstMaxLen)
<a name="l00040"></a>00040 User::Leave(KErrArgument);
<a name="l00041"></a>00041
<a name="l00042"></a>00042 <span class="comment">//don't scribble Destination (pDst) by only consuming enough source to fill pDst</span>
<a name="l00043"></a>00043 TUint srcUse = (dstMaxLen - iDst->Position()) / 2;
<a name="l00044"></a>00044 <span class="keyword">const</span> TUint srcLen = iSrc->Data().Length();
<a name="l00045"></a>00045 <span class="keyword">const</span> TUint sourceRemain = srcLen - iSrc->Position();
<a name="l00046"></a>00046
<a name="l00047"></a>00047 <span class="comment">//make sure we don't blow source by checking against remaining</span>
<a name="l00048"></a>00048 <span class="comment">//and clipping to minimum remaining if necessary</span>
<a name="l00049"></a>00049 srcUse = (srcUse<sourceRemain ? srcUse : sourceRemain);
<a name="l00050"></a>00050
<a name="l00051"></a>00051 <span class="comment">//we need to cast away CONST even on the source, as the TClass needs a TUint8*</span>
<a name="l00052"></a>00052 TUint8* pSrc = CONST_CAST(TUint8*,iSrc->Data().Ptr());
<a name="l00053"></a>00053 pSrc += iSrc->Position();
<a name="l00054"></a>00054 TUint8* pDst = CONST_CAST(TUint8*,iDst->Data().Ptr());
<a name="l00055"></a>00055 pDst += iDst->Position();
<a name="l00056"></a>00056
<a name="l00057"></a>00057 Convert(pSrc, pDst, srcUse );
<a name="l00058"></a>00058
<a name="l00059"></a>00059 <span class="keywordflow">if</span> ((srcUse * 2) + iDst->Position() < dstMaxLen)
<a name="l00060"></a>00060 result.iStatus = TCodecProcessResult::EDstNotFilled;
<a name="l00061"></a>00061
<a name="l00062"></a>00062 <span class="keywordflow">else</span> if (srcUse + iSrc->Position() >= srcLen)
<a name="l00063"></a>00063 result.iStatus = TCodecProcessResult::EProcessComplete;
<a name="l00064"></a>00064
<a name="l00065"></a>00065 result.iSrcBytesProcessed = srcUse;
<a name="l00066"></a>00066 result.iDstBytesAdded = srcUse * 2;
<a name="l00067"></a>00067
<a name="l00068"></a>00068 iDst->Data().SetLength(iDst->Position() + (srcUse * 2));
<a name="l00069"></a>00069
<a name="l00070"></a>00070 <span class="keywordflow">return</span> result;
<a name="l00071"></a>00071 }
<a name="l00072"></a>00072
<a name="l00073"></a>00073
<a name="l00074"></a>00074 <span class="comment">// Helper to convert signed 8-bit to signed 16-bit</span>
<a name="l00075"></a>00075 <span class="keywordtype">void</span> CMMFExPcm8Pcm16Codec::Convert(TUint8* aSrc, TUint8* aDst, TInt aSamples)
<a name="l00076"></a>00076 {
<a name="l00077"></a>00077 <span class="keyword">const</span> TInt KAndMask8bit = 0xff;
<a name="l00078"></a>00078 TInt s16;
<a name="l00079"></a>00079 <span class="keywordflow">while</span> (aSamples--)
<a name="l00080"></a>00080 {
<a name="l00081"></a>00081 s16 = (*aSrc++)<<8;
<a name="l00082"></a>00082 *aDst++ = STATIC_CAST( TInt8, s16&KAndMask8bit);
<a name="l00083"></a>00083 *aDst++ = STATIC_CAST( TInt8, (s16>>8)&KAndMask8bit);
<a name="l00084"></a>00084 }
<a name="l00085"></a>00085 }
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