Symbian3/Examples/guid-6013a680-57f9-415b-8851-c4fa63356636/mmfrawformat_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/MmfExFormatPlugin/mmfrawformat.cpp</h1><div class="fragment"><pre class="fragment"><a name="l00001"></a>00001 <span class="comment">// Copyright (c) 2002-2009 Nokia Corporation and/or its subsidiary(-ies).</span>
<a name="l00002"></a>00002 <span class="comment">// All rights reserved.</span>
<a name="l00003"></a>00003 <span class="comment">// This component and the accompanying materials are made available</span>
<a name="l00004"></a>00004 <span class="comment">// under the terms of "Eclipse Public License v1.0"</span>
<a name="l00005"></a>00005 <span class="comment">// which accompanies this distribution, and is available</span>
<a name="l00006"></a>00006 <span class="comment">// at the URL "http://www.eclipse.org/legal/epl-v10.html".</span>
<a name="l00007"></a>00007 <span class="comment">//</span>
<a name="l00008"></a>00008 <span class="comment">// Initial Contributors:</span>
<a name="l00009"></a>00009 <span class="comment">// Nokia Corporation - initial contribution.</span>
<a name="l00010"></a>00010 <span class="comment">//</span>
<a name="l00011"></a>00011 <span class="comment">// Contributors:</span>
<a name="l00012"></a>00012 <span class="comment">//</span>
<a name="l00013"></a>00013 <span class="comment">// Description:</span>
<a name="l00014"></a>00014 <span class="comment">//</span>
<a name="l00015"></a>00015
<a name="l00016"></a>00016 <span class="comment">// MMF framework headers</span>
<a name="l00017"></a>00017 <span class="preprocessor">#include <mmffile.h></span>
<a name="l00018"></a>00018 <span class="preprocessor">#include <ecom.h></span>
<a name="l00019"></a>00019 <span class="preprocessor">#include <mmfformatimplementationuids.hrh></span>
<a name="l00020"></a>00020 <span class="preprocessor">#include <mmffourcc.h></span>
<a name="l00021"></a>00021
<a name="l00022"></a>00022 <span class="preprocessor">#include "mmfrawformat.h"</span>
<a name="l00023"></a>00023 <span class="preprocessor">#include "UIDs.hrh"</span>
<a name="l00024"></a>00024
<a name="l00025"></a>00025 <span class="keyword">const</span> TUint KFormatDefaultFrameSize(0x1000); <span class="comment">//Set default frame size to 4 K</span>
<a name="l00026"></a>00026 <span class="keyword">const</span> TUint KDefineIOBufferSize(0x0200); <span class="comment">//easy to read clip buffer size</span>
<a name="l00027"></a>00027 <span class="keyword">const</span> TUint KOneSecondInMicroSeconds(1000000); <span class="comment">//1 Second</span>
<a name="l00028"></a>00028 <span class="keyword">const</span> TUint KMono(1);
<a name="l00029"></a>00029 <span class="keyword">const</span> TUint KStereo(2);
<a name="l00030"></a>00030 <span class="comment">//this defines the valid sample rates for RAW</span>
<a name="l00031"></a>00031 <span class="keyword">const</span> TUint KRawSampleRates[] = { 8000, 11025, 22050, 44100 };
<a name="l00032"></a>00032
<a name="l00033"></a>00033
<a name="l00034"></a>00034 <span class="comment">//</span>
<a name="l00035"></a>00035 <span class="comment">// CMMFRawFormatRead</span>
<a name="l00036"></a>00036 <span class="comment">//</span>
<a name="l00037"></a>00037
<a name="l00038"></a>00038 <span class="comment">// Factory function</span>
<a name="l00039"></a>00039 CMMFFormatDecode* CMMFRawFormatRead::NewL(MDataSource* aSource)
<a name="l00040"></a>00040 {
<a name="l00041"></a>00041 <span class="keywordflow">if</span> ((aSource->DataSourceType()==KUidMmfDescriptorSource)||
<a name="l00042"></a>00042 (aSource->DataSourceType()==KUidMmfFileSource))
<a name="l00043"></a>00043 {<span class="comment">//currently only files and descriptor MDataSources are supported</span>
<a name="l00044"></a>00044 <a class="code" href="class_c_m_m_f_raw_format_read.html">CMMFRawFormatRead</a>* <span class="keyword">self</span> = <span class="keyword">new</span>(ELeave)<a class="code" href="class_c_m_m_f_raw_format_read.html">CMMFRawFormatRead</a>;
<a name="l00045"></a>00045 CleanupStack::PushL(<span class="keyword">self</span>);
<a name="l00046"></a>00046 <span class="keyword">self</span>->ConstructL(aSource);
<a name="l00047"></a>00047 CleanupStack::Pop();
<a name="l00048"></a>00048 <span class="keywordflow">return</span> <span class="keyword">self</span>;
<a name="l00049"></a>00049 }
<a name="l00050"></a>00050 <span class="keywordflow">else</span> <span class="keywordflow">return</span> NULL;
<a name="l00051"></a>00051 }
<a name="l00052"></a>00052
<a name="l00053"></a>00053 <span class="comment">// Destructor</span>
<a name="l00054"></a>00054 CMMFRawFormatRead::~CMMFRawFormatRead()
<a name="l00055"></a>00055 {
<a name="l00056"></a>00056 <span class="keyword">delete</span> iBuffer;
<a name="l00057"></a>00057 }
<a name="l00058"></a>00058
<a name="l00059"></a>00059 <span class="comment">// Second-phase constructor</span>
<a name="l00060"></a>00060 <span class="keywordtype">void</span> CMMFRawFormatRead::ConstructL(MDataSource* aSource)
<a name="l00061"></a>00061 {
<a name="l00062"></a>00062 <span class="comment">// tell clip we're using it</span>
<a name="l00063"></a>00063 iClip = aSource;
<a name="l00064"></a>00064 User::LeaveIfError(iClip->SourceThreadLogon(*<span class="keyword">this</span>));
<a name="l00065"></a>00065 iClip->SourcePrimeL();
<a name="l00066"></a>00066 iFrameSize = KFormatDefaultFrameSize;
<a name="l00067"></a>00067 iClipLength = (<span class="keyword">static_cast<</span>CMMFClip*<span class="keyword">></span>(iClip))->Size();
<a name="l00068"></a>00068 }
<a name="l00069"></a>00069
<a name="l00070"></a>00070 <span class="comment">// Implementing MDataSource</span>
<a name="l00071"></a>00071
<a name="l00072"></a>00072 <span class="comment">// Handle request to fill buffer with data from clip</span>
<a name="l00073"></a>00073 <span class="keywordtype">void</span> CMMFRawFormatRead::FillBufferL(CMMFBuffer* aBuffer, MDataSink* aConsumer, TMediaId aMediaId )
<a name="l00074"></a>00074 {
<a name="l00075"></a>00075 <span class="comment">// check media id & pass onto the clip</span>
<a name="l00076"></a>00076 <span class="keywordflow">if</span> (aMediaId.iMediaType != KUidMediaTypeAudio) User::Leave(KErrNotSupported);
<a name="l00077"></a>00077 iDataPath = aConsumer;
<a name="l00078"></a>00078 <span class="comment">//assumes first frame is frame 1</span>
<a name="l00079"></a>00079 TUint position = ((aBuffer->FrameNumber()-1)*iFrameSize)+iStartPosition;
<a name="l00080"></a>00080 (<span class="keyword">static_cast<</span>CMMFClip*<span class="keyword">></span>(iClip))->ReadBufferL(aBuffer, position, <span class="keyword">this</span>);
<a name="l00081"></a>00081 <span class="comment">// notified of when buffer is full by BufferFilledL</span>
<a name="l00082"></a>00082 }
<a name="l00083"></a>00083
<a name="l00084"></a>00084 <span class="comment">// creates the buffer for the source</span>
<a name="l00085"></a>00085 <span class="comment">// This overload supplies the sink buffer, as optimal source buffer size creation may depend on this</span>
<a name="l00086"></a>00086 CMMFBuffer* CMMFRawFormatRead::CreateSourceBufferL(TMediaId aMediaId, CMMFBuffer& aSinkBuffer, TBool &aReference)
<a name="l00087"></a>00087 {
<a name="l00088"></a>00088 <span class="keywordflow">if</span> (aMediaId.iMediaType == KUidMediaTypeAudio)
<a name="l00089"></a>00089 {
<a name="l00090"></a>00090 NegotiateSourceBufferL(aSinkBuffer); <span class="comment">//sets frame size to match sink buffer</span>
<a name="l00091"></a>00091 <span class="keywordflow">return</span> CreateSourceBufferL(aMediaId, aReference);
<a name="l00092"></a>00092 }
<a name="l00093"></a>00093 <span class="keywordflow">else</span> User::Leave(KErrNotSupported);
<a name="l00094"></a>00094 <span class="keywordflow">return</span> NULL;
<a name="l00095"></a>00095 }
<a name="l00096"></a>00096
<a name="l00097"></a>00097 <span class="comment">// creates the buffer for the source</span>
<a name="l00098"></a>00098 CMMFBuffer* CMMFRawFormatRead::CreateSourceBufferL(TMediaId aMediaId, TBool &aReference)
<a name="l00099"></a>00099 {
<a name="l00100"></a>00100 <span class="keywordflow">if</span> (aMediaId.iMediaType == KUidMediaTypeAudio)
<a name="l00101"></a>00101 {
<a name="l00102"></a>00102 <span class="comment">// assume default frame size if haven't determined a better one</span>
<a name="l00103"></a>00103 <span class="keywordflow">if</span> (!iFrameSize) iFrameSize = KFormatDefaultFrameSize;
<a name="l00104"></a>00104 <span class="comment">// sets aReference to false if a new CMMFBuffer is returned</span>
<a name="l00105"></a>00105 aReference = EFalse;
<a name="l00106"></a>00106 <span class="keywordflow">return</span> CreateSourceBufferOfSizeL(iFrameSize);
<a name="l00107"></a>00107 }
<a name="l00108"></a>00108 <span class="keywordflow">else</span> User::Leave(KErrNotSupported);
<a name="l00109"></a>00109 <span class="keywordflow">return</span> NULL;
<a name="l00110"></a>00110 }
<a name="l00111"></a>00111
<a name="l00112"></a>00112 <span class="comment">// Helper function to create and zero fill a buffer of specified size</span>
<a name="l00113"></a>00113 CMMFDataBuffer* CMMFRawFormatRead::CreateSourceBufferOfSizeL(TUint aSize)
<a name="l00114"></a>00114 {
<a name="l00115"></a>00115 <span class="comment">//needs to create source buffer</span>
<a name="l00116"></a>00116 CMMFDataBuffer* buffer = CMMFDataBuffer::NewL(aSize);
<a name="l00117"></a>00117 buffer->Data().FillZ(aSize);
<a name="l00118"></a>00118 <span class="keywordflow">return</span> buffer;
<a name="l00119"></a>00119 }
<a name="l00120"></a>00120
<a name="l00121"></a>00121 <span class="comment">// Helper function to determine best source buffer size</span>
<a name="l00122"></a>00122 <span class="keywordtype">void</span> CMMFRawFormatRead::NegotiateSourceBufferL(CMMFBuffer& aSinkBuffer)
<a name="l00123"></a>00123 {
<a name="l00124"></a>00124 <span class="comment">// if sink buffer has a fixed size use this to determine source buffer size</span>
<a name="l00125"></a>00125 <span class="keywordflow">if</span> (aSinkBuffer.Type() == KUidMmfDataBuffer)
<a name="l00126"></a>00126 {
<a name="l00127"></a>00127 <span class="comment">// RAW is linear data, so can set target buffer to sink buffer size</span>
<a name="l00128"></a>00128 TUint sinkBufferLength = (<span class="keyword">static_cast<</span>CMMFDataBuffer&<span class="keyword">></span>(aSinkBuffer)).Data().MaxLength();
<a name="l00129"></a>00129 <span class="keywordflow">if</span> (sinkBufferLength == 0) sinkBufferLength = KFormatDefaultFrameSize;
<a name="l00130"></a>00130 iFrameSize = sinkBufferLength;
<a name="l00131"></a>00131 CalculateFrameTimeInterval();
<a name="l00132"></a>00132 }
<a name="l00133"></a>00133 <span class="keywordflow">else</span>
<a name="l00134"></a>00134 User::Leave(KErrNotSupported);
<a name="l00135"></a>00135 }
<a name="l00136"></a>00136
<a name="l00137"></a>00137 <span class="comment">// returns the codec FourCC code for the mediaId</span>
<a name="l00138"></a>00138 TFourCC CMMFRawFormatRead::SourceDataTypeCode(TMediaId aMediaId)
<a name="l00139"></a>00139 {
<a name="l00140"></a>00140 <span class="keywordflow">if</span> (aMediaId.iMediaType == KUidMediaTypeAudio) <span class="keywordflow">return</span> iFourCC;
<a name="l00141"></a>00141 <span class="keywordflow">else</span> <span class="keywordflow">return</span> TFourCC(); <span class="comment">//defaults to 'NULL' fourCC</span>
<a name="l00142"></a>00142 }
<a name="l00143"></a>00143
<a name="l00144"></a>00144 <span class="comment">// sets the codec FourCC code for the mediaId</span>
<a name="l00145"></a>00145 TInt CMMFRawFormatRead::SetSourceDataTypeCode(TFourCC aSinkFourCC, TMediaId aMediaId)
<a name="l00146"></a>00146 {
<a name="l00147"></a>00147 <span class="keywordflow">if</span> (aMediaId.iMediaType != KUidMediaTypeAudio) <span class="keywordflow">return</span> KErrNotSupported;
<a name="l00148"></a>00148 <span class="keywordflow">else</span> iFourCC = aSinkFourCC;
<a name="l00149"></a>00149
<a name="l00150"></a>00150 <span class="keywordflow">if</span> ((iFourCC == KMMFFourCCCodePCM16) ||
<a name="l00151"></a>00151 (iFourCC == KMMFFourCCCodePCM16B) ||
<a name="l00152"></a>00152 (iFourCC == KMMFFourCCCodePCMU16))
<a name="l00153"></a>00153 iBitsPerSample = 16;
<a name="l00154"></a>00154 <span class="keywordflow">else</span> <span class="keywordflow">if</span> ((iFourCC == KMMFFourCCCodeIMAD) ||
<a name="l00155"></a>00155 (iFourCC == KMMFFourCCCodeIMAS))
<a name="l00156"></a>00156 iBitsPerSample = 4;
<a name="l00157"></a>00157 <span class="keywordflow">else</span>
<a name="l00158"></a>00158 iBitsPerSample = 8; <span class="comment">//default to 8</span>
<a name="l00159"></a>00159 <span class="keywordflow">return</span> KErrNone;
<a name="l00160"></a>00160 }
<a name="l00161"></a>00161
<a name="l00162"></a>00162 <span class="comment">// Initiate use of the interface </span>
<a name="l00163"></a>00163 TInt CMMFRawFormatRead::SourceThreadLogon(MAsyncEventHandler& aEventHandler)
<a name="l00164"></a>00164 {<span class="comment">//pass through to source clip</span>
<a name="l00165"></a>00165 <span class="keywordflow">return</span>(iClip->SourceThreadLogon(aEventHandler));
<a name="l00166"></a>00166 }
<a name="l00167"></a>00167
<a name="l00168"></a>00168 <span class="comment">// Prepare clip</span>
<a name="l00169"></a>00169 <span class="keywordtype">void</span> CMMFRawFormatRead::SourcePrimeL()
<a name="l00170"></a>00170 {
<a name="l00171"></a>00171 iClip->SourcePrimeL();
<a name="l00172"></a>00172 CalculateFrameTimeInterval();
<a name="l00173"></a>00173 }
<a name="l00174"></a>00174
<a name="l00175"></a>00175 <span class="comment">// Play clip</span>
<a name="l00176"></a>00176 <span class="keywordtype">void</span> CMMFRawFormatRead::SourcePlayL()
<a name="l00177"></a>00177 {
<a name="l00178"></a>00178 iClip->SourcePlayL();
<a name="l00179"></a>00179 }
<a name="l00180"></a>00180
<a name="l00181"></a>00181 <span class="comment">// Pause clip</span>
<a name="l00182"></a>00182 <span class="keywordtype">void</span> CMMFRawFormatRead::SourcePauseL()
<a name="l00183"></a>00183 {
<a name="l00184"></a>00184 iClip->SourcePauseL(); <span class="comment">//propagate state change down to clip</span>
<a name="l00185"></a>00185 }
<a name="l00186"></a>00186
<a name="l00187"></a>00187 <span class="comment">// Stop clip</span>
<a name="l00188"></a>00188 <span class="keywordtype">void</span> CMMFRawFormatRead::SourceStopL()
<a name="l00189"></a>00189 {
<a name="l00190"></a>00190 iClip->SourceStopL();
<a name="l00191"></a>00191 }
<a name="l00192"></a>00192
<a name="l00193"></a>00193 <span class="comment">// End use of the interface</span>
<a name="l00194"></a>00194 <span class="keywordtype">void</span> CMMFRawFormatRead::SourceThreadLogoff()
<a name="l00195"></a>00195 {
<a name="l00196"></a>00196 iClip->SourceThreadLogoff();
<a name="l00197"></a>00197 }
<a name="l00198"></a>00198
<a name="l00199"></a>00199 <span class="comment">// from MDataSink</span>
<a name="l00200"></a>00200
<a name="l00201"></a>00201 <span class="comment">// called by MDataSource to pass back full buffer to the sink</span>
<a name="l00202"></a>00202 <span class="keywordtype">void</span> CMMFRawFormatRead::BufferFilledL(CMMFBuffer* aBuffer)
<a name="l00203"></a>00203 {
<a name="l00204"></a>00204 <span class="comment">//set position</span>
<a name="l00205"></a>00205 TTimeIntervalMicroSeconds position = <span class="comment">//assumes frame numbers begin at frame 1</span>
<a name="l00206"></a>00206 TTimeIntervalMicroSeconds(TInt64(aBuffer->FrameNumber()-1)*iFrameTimeInterval.Int64());
<a name="l00207"></a>00207 aBuffer->SetTimeToPlay(position);
<a name="l00208"></a>00208 iDataPath->BufferFilledL(aBuffer);
<a name="l00209"></a>00209 }
<a name="l00210"></a>00210
<a name="l00211"></a>00211
<a name="l00212"></a>00212 <span class="comment">// from CMMFFormatDecode</span>
<a name="l00213"></a>00213
<a name="l00214"></a>00214 <span class="comment">// returns number of streams</span>
<a name="l00215"></a>00215 TUint CMMFRawFormatRead::Streams(TUid aMediaType)<span class="keyword"> const</span>
<a name="l00216"></a>00216 <span class="keyword"> </span>{
<a name="l00217"></a>00217 <span class="comment">//need to check aMediaType for audio</span>
<a name="l00218"></a>00218 <span class="keywordflow">if</span> (aMediaType == KUidMediaTypeAudio) <span class="keywordflow">return</span> 1; <span class="comment">//raw files can only have 1 audio stream</span>
<a name="l00219"></a>00219 <span class="keywordflow">else</span> <span class="keywordflow">return</span> 0;
<a name="l00220"></a>00220 }
<a name="l00221"></a>00221
<a name="l00222"></a>00222 <span class="comment">// returns the time interval for one frame</span>
<a name="l00223"></a>00223 TTimeIntervalMicroSeconds CMMFRawFormatRead::FrameTimeInterval(TMediaId aMediaId)<span class="keyword"> const</span>
<a name="l00224"></a>00224 <span class="keyword"> </span>{
<a name="l00225"></a>00225 <span class="keywordflow">if</span> (aMediaId.iMediaType == KUidMediaTypeAudio) <span class="keywordflow">return</span> iFrameTimeInterval;
<a name="l00226"></a>00226 <span class="keywordflow">else</span> <span class="keywordflow">return</span> TTimeIntervalMicroSeconds(0);
<a name="l00227"></a>00227 }
<a name="l00228"></a>00228
<a name="l00229"></a>00229 <span class="comment">// returns the duration of the source clip</span>
<a name="l00230"></a>00230 TTimeIntervalMicroSeconds CMMFRawFormatRead::Duration(TMediaId aMediaId)<span class="keyword"> const</span>
<a name="l00231"></a>00231 <span class="keyword"> </span>{
<a name="l00232"></a>00232 <span class="keywordflow">if</span> ((aMediaId.iMediaType == KUidMediaTypeAudio) &&
<a name="l00233"></a>00233 (iClipLength) && (iSampleRate) && (iBitsPerSample) && (iChannels))
<a name="l00234"></a>00234 {<span class="comment">//we have enough values to calculate the duration</span>
<a name="l00235"></a>00235 TInt64 clipLength(iClipLength);
<a name="l00236"></a>00236 clipLength*=KOneSecondInMicroSeconds;
<a name="l00237"></a>00237 TTimeIntervalMicroSeconds duration = TTimeIntervalMicroSeconds(clipLength/iSampleRate);
<a name="l00238"></a>00238 duration = TTimeIntervalMicroSeconds(duration.Int64()/(iBitsPerSample*iChannels));
<a name="l00239"></a>00239 duration = TTimeIntervalMicroSeconds(duration.Int64()*8);
<a name="l00240"></a>00240 <span class="keywordflow">return</span> duration;
<a name="l00241"></a>00241 }
<a name="l00242"></a>00242 <span class="keywordflow">else</span> <span class="keywordflow">return</span> TTimeIntervalMicroSeconds(0);
<a name="l00243"></a>00243 }
<a name="l00244"></a>00244
<a name="l00245"></a>00245 <span class="comment">// helper function: calculates time between frames</span>
<a name="l00246"></a>00246 <span class="keywordtype">void</span> CMMFRawFormatRead::CalculateFrameTimeInterval()
<a name="l00247"></a>00247 {
<a name="l00248"></a>00248 <span class="keywordflow">if</span> ((iFrameSize) && (iSampleRate) && (iBitsPerSample) && (iChannels))
<a name="l00249"></a>00249 {
<a name="l00250"></a>00250 iFrameTimeInterval = TTimeIntervalMicroSeconds((iFrameSize*KOneSecondInMicroSeconds)/iSampleRate);
<a name="l00251"></a>00251 iFrameTimeInterval =
<a name="l00252"></a>00252 TTimeIntervalMicroSeconds(iFrameTimeInterval.Int64()/(iBitsPerSample*iChannels));
<a name="l00253"></a>00253 iFrameTimeInterval = TTimeIntervalMicroSeconds(iFrameTimeInterval.Int64()*8);
<a name="l00254"></a>00254 }
<a name="l00255"></a>00255 }
<a name="l00256"></a>00256
<a name="l00257"></a>00257 <span class="comment">// called by sink to suggest a source buffer size</span>
<a name="l00258"></a>00258 <span class="keywordtype">void</span> CMMFRawFormatRead::SuggestSourceBufferSize(TUint aSuggestedBufferSize)
<a name="l00259"></a>00259 {
<a name="l00260"></a>00260 iFrameSize = aSuggestedBufferSize; <span class="comment">//set source format frame size to buffer size suggested by sink</span>
<a name="l00261"></a>00261 CalculateFrameTimeInterval();
<a name="l00262"></a>00262 }
<a name="l00263"></a>00263
<a name="l00264"></a>00264 <span class="comment">// set the number of channels</span>
<a name="l00265"></a>00265 TInt CMMFRawFormatRead::SetNumChannels(TUint aChannels)
<a name="l00266"></a>00266 {
<a name="l00267"></a>00267 TInt error = KErrNone;
<a name="l00268"></a>00268 <span class="keywordflow">if</span> ((aChannels == KMono)||(aChannels == KStereo)) iChannels = aChannels;
<a name="l00269"></a>00269 <span class="keywordflow">else</span> error = KErrNotSupported; <span class="comment">//only alow one or two channels</span>
<a name="l00270"></a>00270 <span class="keywordflow">return</span> error;
<a name="l00271"></a>00271 }
<a name="l00272"></a>00272
<a name="l00273"></a>00273 <span class="comment">// set the sample rate</span>
<a name="l00274"></a>00274 TInt CMMFRawFormatRead::SetSampleRate(TUint aSampleRate)
<a name="l00275"></a>00275 {
<a name="l00276"></a>00276 TInt status = KErrNotSupported;
<a name="l00277"></a>00277 <span class="comment">//we'll iterate through the valid sample table</span>
<a name="l00278"></a>00278 TInt i = <span class="keyword">sizeof</span>(KRawSampleRates) / <span class="keyword">sizeof</span>(TUint);
<a name="l00279"></a>00279
<a name="l00280"></a>00280 <span class="keywordflow">while</span> ((i--) && (status != KErrNone))
<a name="l00281"></a>00281 {
<a name="l00282"></a>00282 <span class="keywordflow">if</span> (aSampleRate == KRawSampleRates[i])
<a name="l00283"></a>00283 {
<a name="l00284"></a>00284 iSampleRate = aSampleRate;
<a name="l00285"></a>00285 status = KErrNone;
<a name="l00286"></a>00286 }
<a name="l00287"></a>00287 }
<a name="l00288"></a>00288 <span class="keywordflow">return</span> status;
<a name="l00289"></a>00289 }
<a name="l00290"></a>00290
<a name="l00291"></a>00291 <span class="comment">// helper function to read from clip</span>
<a name="l00292"></a>00292 <span class="keywordtype">void</span> CMMFRawFormatRead::DoReadL(TInt aReadPosition)
<a name="l00293"></a>00293 {
<a name="l00294"></a>00294 STATIC_CAST(CMMFClip*,iClip)->ReadBufferL(iBuffer,aReadPosition);
<a name="l00295"></a>00295 }
<a name="l00296"></a>00296
<a name="l00297"></a>00297 <span class="comment">// get the supported sample rates</span>
<a name="l00298"></a>00298 <span class="keywordtype">void</span> CMMFRawFormatRead::GetSupportedSampleRatesL(RArray<TUint>& aSampleRates)
<a name="l00299"></a>00299 {
<a name="l00300"></a>00300 aSampleRates.Reset();
<a name="l00301"></a>00301
<a name="l00302"></a>00302 <span class="comment">// Iterate through the valid sample table and append each value to aSampleRates</span>
<a name="l00303"></a>00303 TInt i = <span class="keyword">sizeof</span>(KRawSampleRates) / <span class="keyword">sizeof</span>(TUint);
<a name="l00304"></a>00304
<a name="l00305"></a>00305 <span class="keywordflow">while</span> (i--)
<a name="l00306"></a>00306 {
<a name="l00307"></a>00307 User::LeaveIfError(aSampleRates.Append(KRawSampleRates[i]));
<a name="l00308"></a>00308 }
<a name="l00309"></a>00309 }
<a name="l00310"></a>00310
<a name="l00311"></a>00311 <span class="comment">// get the supported channel number options</span>
<a name="l00312"></a>00312 <span class="keywordtype">void</span> CMMFRawFormatRead::GetSupportedNumChannelsL(RArray<TUint>& aNumChannels)
<a name="l00313"></a>00313 {
<a name="l00314"></a>00314 aNumChannels.Reset();
<a name="l00315"></a>00315 User::LeaveIfError(aNumChannels.Append(KMono));
<a name="l00316"></a>00316 User::LeaveIfError(aNumChannels.Append(KStereo));
<a name="l00317"></a>00317 }
<a name="l00318"></a>00318
<a name="l00319"></a>00319 <span class="comment">// get the supported codecs</span>
<a name="l00320"></a>00320 <span class="keywordtype">void</span> CMMFRawFormatRead::GetSupportedDataTypesL(TMediaId aMediaId, RArray<TFourCC>& aDataTypes)
<a name="l00321"></a>00321 {
<a name="l00322"></a>00322 <span class="keywordflow">if</span> (aMediaId.iMediaType != KUidMediaTypeAudio)
<a name="l00323"></a>00323 User::Leave(KErrNotSupported);
<a name="l00324"></a>00324 aDataTypes.Reset();
<a name="l00325"></a>00325 User::LeaveIfError(aDataTypes.Append(KMMFFourCCCodePCM16));
<a name="l00326"></a>00326 User::LeaveIfError(aDataTypes.Append(KMMFFourCCCodePCM16B));
<a name="l00327"></a>00327 User::LeaveIfError(aDataTypes.Append(KMMFFourCCCodePCMU16));
<a name="l00328"></a>00328 User::LeaveIfError(aDataTypes.Append(KMMFFourCCCodeIMAD));
<a name="l00329"></a>00329 User::LeaveIfError(aDataTypes.Append(KMMFFourCCCodeIMAS));
<a name="l00330"></a>00330 }
<a name="l00331"></a>00331
<a name="l00332"></a>00332
<a name="l00333"></a>00333 <span class="comment">//</span>
<a name="l00334"></a>00334 <span class="comment">// CMMFRawFormatWrite</span>
<a name="l00335"></a>00335 <span class="comment">//</span>
<a name="l00336"></a>00336
<a name="l00337"></a>00337 <span class="comment">// Factory function</span>
<a name="l00338"></a>00338 CMMFFormatEncode* CMMFRawFormatWrite::NewL(MDataSink* aSink)
<a name="l00339"></a>00339 {
<a name="l00340"></a>00340 <span class="keywordflow">if</span> ((aSink->DataSinkType()==KUidMmfDescriptorSink)||
<a name="l00341"></a>00341 (aSink->DataSinkType()==KUidMmfFileSink))
<a name="l00342"></a>00342 {<span class="comment">//currently only files and descriptor MDataSources are supported</span>
<a name="l00343"></a>00343 <a class="code" href="class_c_m_m_f_raw_format_write.html">CMMFRawFormatWrite</a>* <span class="keyword">self</span> = <span class="keyword">new</span>(ELeave)<a class="code" href="class_c_m_m_f_raw_format_write.html">CMMFRawFormatWrite</a>;
<a name="l00344"></a>00344 CleanupStack::PushL(<span class="keyword">self</span>);
<a name="l00345"></a>00345 <span class="keyword">self</span>->ConstructL(aSink);
<a name="l00346"></a>00346 CleanupStack::Pop();
<a name="l00347"></a>00347 <span class="keywordflow">return</span> STATIC_CAST(CMMFFormatEncode*, <span class="keyword">self</span>);
<a name="l00348"></a>00348 }
<a name="l00349"></a>00349 <span class="keywordflow">else</span> <span class="keywordflow">return</span> NULL;
<a name="l00350"></a>00350 }
<a name="l00351"></a>00351
<a name="l00352"></a>00352 <span class="comment">// destructor</span>
<a name="l00353"></a>00353 CMMFRawFormatWrite::~CMMFRawFormatWrite()
<a name="l00354"></a>00354 {
<a name="l00355"></a>00355 <span class="keyword">delete</span> iBuffer;
<a name="l00356"></a>00356 <span class="keyword">delete</span> iConvertBuffer;
<a name="l00357"></a>00357 <span class="keyword">delete</span> iChannelAndSampleRateConverterFactory;
<a name="l00358"></a>00358 }
<a name="l00359"></a>00359
<a name="l00360"></a>00360 <span class="comment">// second-phase construction </span>
<a name="l00361"></a>00361 <span class="keywordtype">void</span> CMMFRawFormatWrite::ConstructL(MDataSink* aSink)
<a name="l00362"></a>00362 {
<a name="l00363"></a>00363 iClip = aSink;
<a name="l00364"></a>00364 <span class="comment">//first need to check if sink clip already exists to get settings.</span>
<a name="l00365"></a>00365 User::LeaveIfError(iClip->SinkThreadLogon(*<span class="keyword">this</span>));
<a name="l00366"></a>00366 iClip->SinkPrimeL();
<a name="l00367"></a>00367 iBuffer = CreateSinkBufferOfSizeL(KDefineIOBufferSize); <span class="comment">//512 easiest file size to read</span>
<a name="l00368"></a>00368 DoReadL(0);<span class="comment">//read from beginning of clip</span>
<a name="l00369"></a>00369 <span class="keywordflow">if</span> (iBuffer->Data().Size()> 0)
<a name="l00370"></a>00370 {
<a name="l00371"></a>00371 iClipAlreadyExists = ETrue;
<a name="l00372"></a>00372 <span class="comment">//There is no header, so data size is the same as the clip size in this case.</span>
<a name="l00373"></a>00373 iDataSize = iClipLength = STATIC_CAST(CMMFClip*,iClip)->Size();
<a name="l00374"></a>00374 }
<a name="l00375"></a>00375 iFrameSize = KFormatDefaultFrameSize;
<a name="l00376"></a>00376 }
<a name="l00377"></a>00377
<a name="l00378"></a>00378 <span class="comment">// from MDataSink</span>
<a name="l00379"></a>00379
<a name="l00380"></a>00380 <span class="comment">// sink thread attaches</span>
<a name="l00381"></a>00381 TInt CMMFRawFormatWrite::SinkThreadLogon(MAsyncEventHandler& aEventHandler)
<a name="l00382"></a>00382 {<span class="comment">//pass through to sink clip</span>
<a name="l00383"></a>00383 <span class="keywordflow">return</span>(iClip->SinkThreadLogon(aEventHandler));
<a name="l00384"></a>00384 }
<a name="l00385"></a>00385
<a name="l00386"></a>00386 <span class="comment">// helper function: calculates time between frames</span>
<a name="l00387"></a>00387 <span class="keywordtype">void</span> CMMFRawFormatWrite::CalculateFrameTimeInterval()
<a name="l00388"></a>00388 {
<a name="l00389"></a>00389 <span class="keywordflow">if</span> ((iFrameSize) && (iSampleRate) && (iBitsPerSample) && (iChannels))
<a name="l00390"></a>00390 {
<a name="l00391"></a>00391 iFrameTimeInterval = TTimeIntervalMicroSeconds((iFrameSize*KOneSecondInMicroSeconds)/iSampleRate);
<a name="l00392"></a>00392 iFrameTimeInterval =
<a name="l00393"></a>00393 TTimeIntervalMicroSeconds((iFrameTimeInterval.Int64())/(iBitsPerSample*iChannels));
<a name="l00394"></a>00394 iFrameTimeInterval = TTimeIntervalMicroSeconds(iFrameTimeInterval.Int64()*8);
<a name="l00395"></a>00395 }
<a name="l00396"></a>00396 }
<a name="l00397"></a>00397
<a name="l00398"></a>00398 <span class="comment">// called if sink setup depends on source</span>
<a name="l00399"></a>00399 <span class="keywordtype">void</span> CMMFRawFormatWrite::Negotiate(MDataSource& aSource)
<a name="l00400"></a>00400 {
<a name="l00401"></a>00401 <span class="keywordflow">if</span> (aSource.DataSourceType() == KUidMmfAudioInput)
<a name="l00402"></a>00402 {
<a name="l00403"></a>00403 <span class="comment">// could query the audio capabilities from DevSound for the settings below</span>
<a name="l00404"></a>00404 iSourceSampleRate = 8000; <span class="comment">// assume 8KHz for now</span>
<a name="l00405"></a>00405 iSourceChannels = 1; <span class="comment">//assume mono</span>
<a name="l00406"></a>00406 iSourceFourCC.Set(KMMFFourCCCodePCM16); <span class="comment">//16 bit PCM</span>
<a name="l00407"></a>00407 }
<a name="l00408"></a>00408 <span class="keywordflow">else</span> <span class="keywordflow">if</span> (aSource.DataSourceType() == KUidMmfFormatDecode)
<a name="l00409"></a>00409 {<span class="comment">//source is a clip so for now set sink settings to match source</span>
<a name="l00410"></a>00410 iSourceSampleRate = ((CMMFFormatDecode&)aSource).SampleRate();
<a name="l00411"></a>00411 iSourceChannels = ((CMMFFormatDecode&)aSource).NumChannels();
<a name="l00412"></a>00412 iSourceFourCC.Set(aSource.SourceDataTypeCode(TMediaId(KUidMediaTypeAudio)));
<a name="l00413"></a>00413 iSourceWillSampleConvert = STATIC_CAST(CMMFFormatDecode&, aSource).SourceSampleConvert();
<a name="l00414"></a>00414 ((CMMFFormatDecode&)aSource).SuggestSourceBufferSize(iFrameSize); <span class="comment">//for now suggest format src takes same buf size as sink??</span>
<a name="l00415"></a>00415 <span class="comment">//make the start position the end of the clip</span>
<a name="l00416"></a>00416 }
<a name="l00417"></a>00417 <span class="keywordflow">else</span> <span class="keywordflow">return</span>;
<a name="l00418"></a>00418 <span class="comment">//set default sink parameters to be the same as the source</span>
<a name="l00419"></a>00419 <span class="keywordflow">if</span> (iClipAlreadyExists) iStartPosition = iClipLength;
<a name="l00420"></a>00420 <span class="keywordflow">if</span> (!iSampleRate) iSampleRate = iSourceSampleRate; <span class="comment">//might have already been set by custom command</span>
<a name="l00421"></a>00421 <span class="keywordflow">if</span> (!iChannels) iChannels = iSourceChannels;
<a name="l00422"></a>00422 <span class="keywordflow">if</span> (!iBitsPerSample)
<a name="l00423"></a>00423 {
<a name="l00424"></a>00424 iFourCC.Set(iSourceFourCC);
<a name="l00425"></a>00425 <span class="keywordflow">if</span> ((iFourCC == KMMFFourCCCodePCM16) ||
<a name="l00426"></a>00426 (iFourCC == KMMFFourCCCodePCM16B) ||
<a name="l00427"></a>00427 (iFourCC == KMMFFourCCCodePCMU16))
<a name="l00428"></a>00428 iBitsPerSample = 16;
<a name="l00429"></a>00429 <span class="keywordflow">else</span> <span class="keywordflow">if</span> ((iFourCC == KMMFFourCCCodeIMAD) ||
<a name="l00430"></a>00430 (iFourCC == KMMFFourCCCodeIMAS))
<a name="l00431"></a>00431 iBitsPerSample = 4;
<a name="l00432"></a>00432 <span class="keywordflow">else</span>
<a name="l00433"></a>00433 iBitsPerSample = 8; <span class="comment">//default to 8</span>
<a name="l00434"></a>00434 }
<a name="l00435"></a>00435 CalculateFrameTimeInterval();
<a name="l00436"></a>00436 }
<a name="l00437"></a>00437
<a name="l00438"></a>00438 <span class="comment">// Prime the sink to be accessed</span>
<a name="l00439"></a>00439 <span class="keywordtype">void</span> CMMFRawFormatWrite::SinkPrimeL()
<a name="l00440"></a>00440 {
<a name="l00441"></a>00441 iClip->SinkPrimeL(); <span class="comment">//propagate state change down to clip</span>
<a name="l00442"></a>00442 CalculateFrameTimeInterval();
<a name="l00443"></a>00443 }
<a name="l00444"></a>00444
<a name="l00445"></a>00445 <span class="comment">// Play the sink</span>
<a name="l00446"></a>00446 <span class="keywordtype">void</span> CMMFRawFormatWrite::SinkPlayL()
<a name="l00447"></a>00447 {
<a name="l00448"></a>00448 iClip->SinkPlayL(); <span class="comment">//propagate state change down to clip</span>
<a name="l00449"></a>00449 <span class="keywordflow">if</span> ((iChannels != iSourceChannels) || (iSampleRate != iSourceSampleRate) && (!iSourceWillSampleConvert))
<a name="l00450"></a>00450 {<span class="comment">//the source channels & sample rate don't match the formats - therefore need to do a conversion </span>
<a name="l00451"></a>00451 <span class="comment">//currently only pcm16 is supported so return with an error if format not pcm16</span>
<a name="l00452"></a>00452 <span class="keywordflow">if</span> (iFourCC != KMMFFourCCCodePCM16) User::Leave(KErrNotSupported);
<a name="l00453"></a>00453 iChannelAndSampleRateConverterFactory
<a name="l00454"></a>00454 = <span class="keyword">new</span>(ELeave)CMMFChannelAndSampleRateConverterFactory;
<a name="l00455"></a>00455 iChannelAndSampleRateConverter =
<a name="l00456"></a>00456 iChannelAndSampleRateConverterFactory->CreateConverterL( iSourceSampleRate, iSourceChannels,
<a name="l00457"></a>00457 iSampleRate, iChannels);
<a name="l00458"></a>00458 <span class="comment">//need to create an intermediate buffer in which to place the converted data</span>
<a name="l00459"></a>00459 TUint convertedBufferFrameSize = (iFrameSize*iChannels)/iSourceChannels;
<a name="l00460"></a>00460 iConvertBuffer = CreateSinkBufferOfSizeL(convertedBufferFrameSize);
<a name="l00461"></a>00461 }
<a name="l00462"></a>00462 iFileHasChanged = ETrue; <span class="comment">//file will change if we start playing to it</span>
<a name="l00463"></a>00463 }
<a name="l00464"></a>00464
<a name="l00465"></a>00465 <span class="comment">// Pause the sink</span>
<a name="l00466"></a>00466 <span class="keywordtype">void</span> CMMFRawFormatWrite::SinkPauseL()
<a name="l00467"></a>00467 {
<a name="l00468"></a>00468 iClip->SinkPauseL(); <span class="comment">//propagate state change down to clip</span>
<a name="l00469"></a>00469 }
<a name="l00470"></a>00470
<a name="l00471"></a>00471 <span class="comment">// Stop the sink</span>
<a name="l00472"></a>00472 <span class="keywordtype">void</span> CMMFRawFormatWrite::SinkStopL()
<a name="l00473"></a>00473 {
<a name="l00474"></a>00474 iClip->SinkStopL(); <span class="comment">//propagate state change down to clip</span>
<a name="l00475"></a>00475 }
<a name="l00476"></a>00476
<a name="l00477"></a>00477 <span class="comment">// Detach from the sink</span>
<a name="l00478"></a>00478 <span class="keywordtype">void</span> CMMFRawFormatWrite::SinkThreadLogoff()
<a name="l00479"></a>00479 {
<a name="l00480"></a>00480 iClip->SinkThreadLogoff(); <span class="comment">//propagate down to clip</span>
<a name="l00481"></a>00481 }
<a name="l00482"></a>00482
<a name="l00483"></a>00483 <span class="comment">// Called by the CMMFDataPath to add a buffer to a clip</span>
<a name="l00484"></a>00484 <span class="keywordtype">void</span> CMMFRawFormatWrite::EmptyBufferL(CMMFBuffer* aBuffer, MDataSource* aSupplier, TMediaId aMediaId)
<a name="l00485"></a>00485 {
<a name="l00486"></a>00486 <span class="comment">//since raw always contains linear audio the sink buffer size can set the source buffer size</span>
<a name="l00487"></a>00487
<a name="l00488"></a>00488 <span class="comment">//check media id &pass onto clip</span>
<a name="l00489"></a>00489 <span class="keywordflow">if</span> (aMediaId.iMediaType!=KUidMediaTypeAudio) User::Leave(KErrNotSupported);
<a name="l00490"></a>00490 iDataPath = aSupplier;
<a name="l00491"></a>00491
<a name="l00492"></a>00492 <span class="comment">// Check we haven't exceeded any set maximum on our clip length</span>
<a name="l00493"></a>00493 <span class="keywordflow">if</span> (iMaximumClipSize > 0)
<a name="l00494"></a>00494 {
<a name="l00495"></a>00495 <span class="comment">// Find the current clip size</span>
<a name="l00496"></a>00496 TInt currentClipLength = STATIC_CAST(CMMFClip*, iClip)->Size();
<a name="l00497"></a>00497 TInt bufferSize = aBuffer->BufferSize();
<a name="l00498"></a>00498 <span class="keywordflow">if</span> ((currentClipLength + bufferSize) >= iMaximumClipSize)
<a name="l00499"></a>00499 User::Leave(KErrEof);
<a name="l00500"></a>00500 }
<a name="l00501"></a>00501
<a name="l00502"></a>00502 <span class="comment">//assumes first frame is frame 1</span>
<a name="l00503"></a>00503 iBufferToEmpty = aBuffer; <span class="comment">//save this so it can be returned to datapath</span>
<a name="l00504"></a>00504 TInt position = ((aBuffer->FrameNumber()-1)*iFrameSize)+iStartPosition;
<a name="l00505"></a>00505 <span class="keywordflow">if</span> (position < (TInt)iStartPosition) position = iStartPosition; <span class="comment">//can't write before start of header</span>
<a name="l00506"></a>00506 <span class="keywordflow">if</span> ((iChannelAndSampleRateConverter) && (!iSourceWillSampleConvert))
<a name="l00507"></a>00507 {<span class="comment">//need to perform channel & sample rate conversion before writing to clip</span>
<a name="l00508"></a>00508 iFrameSize = iChannelAndSampleRateConverter->Convert(*(CMMFDataBuffer*)aBuffer,*iConvertBuffer);
<a name="l00509"></a>00509 STATIC_CAST(CMMFClip*,iClip)->WriteBufferL(iConvertBuffer, position, <span class="keyword">this</span>);
<a name="l00510"></a>00510 }
<a name="l00511"></a>00511 <span class="keywordflow">else</span>
<a name="l00512"></a>00512 {<span class="comment">//no need to convert the data</span>
<a name="l00513"></a>00513 STATIC_CAST(CMMFClip*,iClip)->WriteBufferL(aBuffer, position, <span class="keyword">this</span>);
<a name="l00514"></a>00514 }
<a name="l00515"></a>00515 iPos = position; <span class="comment">//save current write position</span>
<a name="l00516"></a>00516 }
<a name="l00517"></a>00517
<a name="l00518"></a>00518 <span class="comment">// helper function to create buffer of specficed size</span>
<a name="l00519"></a>00519 CMMFDataBuffer* CMMFRawFormatWrite::CreateSinkBufferOfSizeL(TUint aSize)
<a name="l00520"></a>00520 {
<a name="l00521"></a>00521 <span class="comment">//needs to create source buffer</span>
<a name="l00522"></a>00522 CMMFDataBuffer* buffer = CMMFDataBuffer::NewL(aSize);
<a name="l00523"></a>00523 buffer->Data().FillZ(aSize);
<a name="l00524"></a>00524 iBufferCreated = ETrue;
<a name="l00525"></a>00525 <span class="keywordflow">return</span> buffer;
<a name="l00526"></a>00526 }
<a name="l00527"></a>00527
<a name="l00528"></a>00528 <span class="comment">// create buffer to receive data</span>
<a name="l00529"></a>00529 CMMFBuffer* CMMFRawFormatWrite::CreateSinkBufferL(TMediaId aMediaId, TBool &aReference)
<a name="l00530"></a>00530 {
<a name="l00531"></a>00531 <span class="keywordflow">if</span> (aMediaId.iMediaType == KUidMediaTypeAudio)
<a name="l00532"></a>00532 {
<a name="l00533"></a>00533 <span class="keywordflow">if</span> (!iFrameSize) iFrameSize = KFormatDefaultFrameSize;
<a name="l00534"></a>00534 aReference = EFalse;
<a name="l00535"></a>00535 <span class="keywordflow">return</span> CreateSinkBufferOfSizeL(iFrameSize);
<a name="l00536"></a>00536 }
<a name="l00537"></a>00537 <span class="keywordflow">else</span> User::Leave(KErrNotSupported);
<a name="l00538"></a>00538 <span class="keywordflow">return</span> NULL;
<a name="l00539"></a>00539 }
<a name="l00540"></a>00540
<a name="l00541"></a>00541 <span class="comment">// gets the codec type</span>
<a name="l00542"></a>00542 TFourCC CMMFRawFormatWrite::SinkDataTypeCode(TMediaId aMediaId)
<a name="l00543"></a>00543 {
<a name="l00544"></a>00544 <span class="keywordflow">if</span> (aMediaId.iMediaType == KUidMediaTypeAudio) <span class="keywordflow">return</span> iFourCC;
<a name="l00545"></a>00545 <span class="keywordflow">else</span> <span class="keywordflow">return</span> TFourCC(); <span class="comment">//defaults to 'NULL' fourCC</span>
<a name="l00546"></a>00546 }
<a name="l00547"></a>00547
<a name="l00548"></a>00548 <span class="comment">// sets the codec type</span>
<a name="l00549"></a>00549 TInt CMMFRawFormatWrite::SetSinkDataTypeCode(TFourCC aSinkFourCC, TMediaId aMediaId)
<a name="l00550"></a>00550 {
<a name="l00551"></a>00551 <span class="keywordflow">if</span> (aMediaId.iMediaType != KUidMediaTypeAudio) <span class="keywordflow">return</span> KErrNotSupported;
<a name="l00552"></a>00552 <span class="keywordflow">else</span> iFourCC = aSinkFourCC;
<a name="l00553"></a>00553
<a name="l00554"></a>00554 <span class="keywordflow">if</span> ((iFourCC == KMMFFourCCCodePCM16) ||
<a name="l00555"></a>00555 (iFourCC == KMMFFourCCCodePCM16B) ||
<a name="l00556"></a>00556 (iFourCC == KMMFFourCCCodePCMU16))
<a name="l00557"></a>00557 iBitsPerSample = 16;
<a name="l00558"></a>00558 <span class="keywordflow">else</span> <span class="keywordflow">if</span> ((iFourCC == KMMFFourCCCodeIMAD) ||
<a name="l00559"></a>00559 (iFourCC == KMMFFourCCCodeIMAS))
<a name="l00560"></a>00560 iBitsPerSample = 4;
<a name="l00561"></a>00561 <span class="keywordflow">else</span>
<a name="l00562"></a>00562 iBitsPerSample = 8; <span class="comment">//default to 8</span>
<a name="l00563"></a>00563
<a name="l00564"></a>00564 <span class="keywordflow">return</span> KErrNone;
<a name="l00565"></a>00565 }
<a name="l00566"></a>00566
<a name="l00567"></a>00567 <span class="comment">// helper function to read data from clip</span>
<a name="l00568"></a>00568 <span class="keywordtype">void</span> CMMFRawFormatWrite::DoReadL(TInt aReadPosition)
<a name="l00569"></a>00569 {
<a name="l00570"></a>00570 STATIC_CAST(CMMFClip*,iClip)->ReadBufferL(iBuffer,aReadPosition);
<a name="l00571"></a>00571 }
<a name="l00572"></a>00572
<a name="l00573"></a>00573 <span class="comment">// helper function to write data to clip</span>
<a name="l00574"></a>00574 <span class="keywordtype">void</span> CMMFRawFormatWrite::DoWriteL(TInt aWritePosition)
<a name="l00575"></a>00575 {
<a name="l00576"></a>00576 STATIC_CAST(CMMFClip*,iClip)->WriteBufferL(iBuffer,aWritePosition);
<a name="l00577"></a>00577 }
<a name="l00578"></a>00578
<a name="l00579"></a>00579
<a name="l00580"></a>00580 <span class="comment">// from MDataSource</span>
<a name="l00581"></a>00581
<a name="l00582"></a>00582 <span class="comment">// called by MDataSink to pass back emptied buffer to the source</span>
<a name="l00583"></a>00583 <span class="keywordtype">void</span> CMMFRawFormatWrite::BufferEmptiedL(CMMFBuffer* aBuffer)
<a name="l00584"></a>00584 {
<a name="l00585"></a>00585 iDataSize+=aBuffer->BufferSize(); <span class="comment">//total bytes written</span>
<a name="l00586"></a>00586 iPos += aBuffer->BufferSize(); <span class="comment">//total bytes written so far - iPos is not always = iDataSize due to repositions</span>
<a name="l00587"></a>00587 <span class="keywordflow">if</span> (iMaxPos < iPos) iMaxPos = iPos; <span class="comment">//need iMaxPos incase we write data then repos to an earlier pos in the clip</span>
<a name="l00588"></a>00588 <span class="keywordflow">if</span> (iBufferToEmpty != aBuffer) iDataPath->BufferEmptiedL(iBufferToEmpty); <span class="comment">//need to return same buffer</span>
<a name="l00589"></a>00589 <span class="keywordflow">else</span> iDataPath->BufferEmptiedL(aBuffer);
<a name="l00590"></a>00590 }
<a name="l00591"></a>00591
<a name="l00592"></a>00592
<a name="l00593"></a>00593 <span class="comment">// from CMMFFormatEncode</span>
<a name="l00594"></a>00594
<a name="l00595"></a>00595 <span class="comment">// set the number of channels </span>
<a name="l00596"></a>00596 TInt CMMFRawFormatWrite::SetNumChannels(TUint aChannels)
<a name="l00597"></a>00597 {
<a name="l00598"></a>00598 TInt error = KErrNone;
<a name="l00599"></a>00599 <span class="keywordflow">if</span> ((aChannels == KMono)||(aChannels == KStereo)) iChannels = aChannels;
<a name="l00600"></a>00600 <span class="keywordflow">else</span> error = KErrNotSupported; <span class="comment">//only alow one or two channels</span>
<a name="l00601"></a>00601 <span class="keywordflow">return</span> error;
<a name="l00602"></a>00602 }
<a name="l00603"></a>00603
<a name="l00604"></a>00604 <span class="comment">// set the sample rate</span>
<a name="l00605"></a>00605 TInt CMMFRawFormatWrite::SetSampleRate(TUint aSampleRate)
<a name="l00606"></a>00606 {
<a name="l00607"></a>00607 TInt status = KErrNotSupported;
<a name="l00608"></a>00608 <span class="comment">//we'll iterate through the valid sample table</span>
<a name="l00609"></a>00609 TInt i = <span class="keyword">sizeof</span>(KRawSampleRates) / <span class="keyword">sizeof</span>(TUint);
<a name="l00610"></a>00610
<a name="l00611"></a>00611 <span class="keywordflow">while</span> ((i--) && (status != KErrNone))
<a name="l00612"></a>00612 {
<a name="l00613"></a>00613 <span class="keywordflow">if</span> (aSampleRate == KRawSampleRates[i])
<a name="l00614"></a>00614 {
<a name="l00615"></a>00615 iSampleRate = aSampleRate;
<a name="l00616"></a>00616 status = KErrNone;
<a name="l00617"></a>00617 }
<a name="l00618"></a>00618 }
<a name="l00619"></a>00619 <span class="keywordflow">return</span> status;
<a name="l00620"></a>00620 }
<a name="l00621"></a>00621
<a name="l00622"></a>00622 <span class="comment">// get the frame interval</span>
<a name="l00623"></a>00623 TTimeIntervalMicroSeconds CMMFRawFormatWrite::FrameTimeInterval(TMediaId aMediaId)<span class="keyword"> const</span>
<a name="l00624"></a>00624 <span class="keyword"> </span>{
<a name="l00625"></a>00625 <span class="keywordflow">if</span> (aMediaId.iMediaType == KUidMediaTypeAudio) <span class="keywordflow">return</span> iFrameTimeInterval;
<a name="l00626"></a>00626 <span class="keywordflow">else</span> <span class="keywordflow">return</span> TTimeIntervalMicroSeconds(0);
<a name="l00627"></a>00627 }
<a name="l00628"></a>00628
<a name="l00629"></a>00629 <span class="comment">// returns the duration of the source clip</span>
<a name="l00630"></a>00630 TTimeIntervalMicroSeconds CMMFRawFormatWrite::Duration(TMediaId aMediaId)<span class="keyword"> const</span>
<a name="l00631"></a>00631 <span class="keyword"> </span>{
<a name="l00632"></a>00632 <span class="keywordflow">if</span> ((aMediaId.iMediaType == KUidMediaTypeAudio)
<a name="l00633"></a>00633 && (iDataSize) && (iSampleRate) && (iBitsPerSample) && (iChannels))
<a name="l00634"></a>00634 {
<a name="l00635"></a>00635 TInt64 clipLength(iDataSize);
<a name="l00636"></a>00636 clipLength*=KOneSecondInMicroSeconds;
<a name="l00637"></a>00637 TTimeIntervalMicroSeconds duration = TTimeIntervalMicroSeconds(clipLength/iSampleRate);
<a name="l00638"></a>00638 duration =
<a name="l00639"></a>00639 TTimeIntervalMicroSeconds(duration.Int64()/(iBitsPerSample*iChannels));
<a name="l00640"></a>00640 duration = TTimeIntervalMicroSeconds(duration.Int64()*8);
<a name="l00641"></a>00641 <span class="keywordflow">return</span> duration;
<a name="l00642"></a>00642 }
<a name="l00643"></a>00643 <span class="keywordflow">else</span> <span class="keywordflow">return</span> TTimeIntervalMicroSeconds(0);
<a name="l00644"></a>00644 }
<a name="l00645"></a>00645
<a name="l00646"></a>00646 <span class="comment">// Calculate and return the number of bytes used for on second of audio.</span>
<a name="l00647"></a>00647 TInt64 CMMFRawFormatWrite::BytesPerSecond()
<a name="l00648"></a>00648 {
<a name="l00649"></a>00649 TInt64 bitsPerSecond = iSampleRate * iBitsPerSample * iChannels ;
<a name="l00650"></a>00650 TInt64 bytesPerSecond = bitsPerSecond/8;
<a name="l00651"></a>00651 <span class="keywordflow">return</span> bytesPerSecond ;
<a name="l00652"></a>00652 }
<a name="l00653"></a>00653
<a name="l00654"></a>00654 <span class="comment">// Shortens the clip from the position specified to the end specified.</span>
<a name="l00655"></a>00655 <span class="keywordtype">void</span> CMMFRawFormatWrite::CropL(TTimeIntervalMicroSeconds aPosition, TBool aToEnd )
<a name="l00656"></a>00656 {
<a name="l00657"></a>00657 <span class="comment">// Does clip have any size to crop</span>
<a name="l00658"></a>00658 <span class="keywordflow">if</span> (!(STATIC_CAST(CMMFClip*,iClip)->Size())) User::Leave(KErrNotFound); <span class="comment">//no clip to crop or clip is 0 bytes.</span>
<a name="l00659"></a>00659
<a name="l00660"></a>00660
<a name="l00661"></a>00661 <span class="comment">// Is aPosition between the start and the end?</span>
<a name="l00662"></a>00662 <span class="keywordflow">if</span> ( ( aPosition < TTimeIntervalMicroSeconds(0) ) || ( aPosition >= Duration( KUidMediaTypeAudio) ) )
<a name="l00663"></a>00663 User::Leave( KErrArgument ) ;
<a name="l00664"></a>00664
<a name="l00665"></a>00665 <span class="comment">// Convert aPostion to cropPosition in bytes</span>
<a name="l00666"></a>00666
<a name="l00667"></a>00667 TInt64 cropPosition64 =
<a name="l00668"></a>00668 TInt64( ( aPosition.Int64() * iSampleRate * (iBitsPerSample/8) * iChannels ) /KOneSecondInMicroSeconds);
<a name="l00669"></a>00669 TUint cropPosition = I64INT(cropPosition64);
<a name="l00670"></a>00670
<a name="l00671"></a>00671 <span class="comment">// Does cropPosition need adjustment to retain integrity? (assume not)</span>
<a name="l00672"></a>00672
<a name="l00673"></a>00673 TUint dataSize ; <span class="comment">// This will be the size of the data left after cropping.</span>
<a name="l00674"></a>00674
<a name="l00675"></a>00675 <span class="keywordflow">if</span> ( !aToEnd )
<a name="l00676"></a>00676 {
<a name="l00677"></a>00677 <span class="comment">// Shift the data physically</span>
<a name="l00678"></a>00678 <span class="comment">// move the data in blocks</span>
<a name="l00679"></a>00679 <span class="comment">// Create a CMMFDataBuffer and use CMMFClip to shift the data</span>
<a name="l00680"></a>00680 dataSize = iMaxPos - cropPosition ;
<a name="l00681"></a>00681 <span class="keywordflow">if</span> (( dataSize > 0 ) && (aPosition != TTimeIntervalMicroSeconds(0)))
<a name="l00682"></a>00682 {
<a name="l00683"></a>00683 TUint bufSize = ( dataSize < KDefineIOBufferSize ? dataSize : KDefineIOBufferSize ) ; <span class="comment">//max bufSize 512</span>
<a name="l00684"></a>00684 CMMFDataBuffer* buffer = CMMFDataBuffer::NewL(bufSize) ;
<a name="l00685"></a>00685 CleanupStack::PushL( buffer ) ;
<a name="l00686"></a>00686
<a name="l00687"></a>00687 TUint rPos = cropPosition ; <span class="comment">// read position</span>
<a name="l00688"></a>00688 TUint wPos = 0;
<a name="l00689"></a>00689 TInt dataToShift = ETrue ;
<a name="l00690"></a>00690 <span class="keywordflow">while</span> ( dataToShift )
<a name="l00691"></a>00691 {
<a name="l00692"></a>00692 STATIC_CAST( CMMFClip*, iClip )->ReadBufferL( buffer, rPos ) ; <span class="comment">// synchronous calls</span>
<a name="l00693"></a>00693 STATIC_CAST( CMMFClip*, iClip )->WriteBufferL( buffer, wPos ) ;
<a name="l00694"></a>00694 <span class="keywordflow">if</span> ( rPos > iMaxPos )
<a name="l00695"></a>00695 dataToShift = EFalse ; <span class="comment">// past the end: Done</span>
<a name="l00696"></a>00696 <span class="keywordflow">else</span>
<a name="l00697"></a>00697 { <span class="comment">// shift the pointers</span>
<a name="l00698"></a>00698 rPos += bufSize ;
<a name="l00699"></a>00699 wPos += bufSize ;
<a name="l00700"></a>00700 }
<a name="l00701"></a>00701 }<span class="comment">// while data to shift</span>
<a name="l00702"></a>00702 CleanupStack::PopAndDestroy( ) ; <span class="comment">// buffer</span>
<a name="l00703"></a>00703 }<span class="comment">// if data to shift</span>
<a name="l00704"></a>00704 }<span class="comment">// crop to start</span>
<a name="l00705"></a>00705 <span class="keywordflow">else</span> <span class="comment">// crop to end</span>
<a name="l00706"></a>00706 dataSize = cropPosition ;
<a name="l00707"></a>00707
<a name="l00708"></a>00708 iDataSize = dataSize ;
<a name="l00709"></a>00709 iMaxPos = dataSize ;
<a name="l00710"></a>00710
<a name="l00711"></a>00711 <span class="comment">// Do the physical chop</span>
<a name="l00712"></a>00712 <span class="keywordflow">if</span> ( iClip->DataSinkType() == KUidMmfFileSink )
<a name="l00713"></a>00713 {
<a name="l00714"></a>00714 STATIC_CAST( CMMFFile*, iClip )->FileL().SetSize( iMaxPos ) ;
<a name="l00715"></a>00715 iClipLength = iMaxPos;
<a name="l00716"></a>00716 }
<a name="l00717"></a>00717 }
<a name="l00718"></a>00718
<a name="l00719"></a>00719 <span class="comment">// get the supported sample rates</span>
<a name="l00720"></a>00720 <span class="keywordtype">void</span> CMMFRawFormatWrite::GetSupportedSampleRatesL(RArray<TUint>& aSampleRates)
<a name="l00721"></a>00721 {
<a name="l00722"></a>00722 aSampleRates.Reset();
<a name="l00723"></a>00723
<a name="l00724"></a>00724 <span class="comment">// Iterate through the valid sample table and append each value to aSampleRates</span>
<a name="l00725"></a>00725 TInt i = <span class="keyword">sizeof</span>(KRawSampleRates) / <span class="keyword">sizeof</span>(TUint);
<a name="l00726"></a>00726
<a name="l00727"></a>00727 <span class="keywordflow">while</span> (i--)
<a name="l00728"></a>00728 {
<a name="l00729"></a>00729 User::LeaveIfError(aSampleRates.Append(KRawSampleRates[i]));
<a name="l00730"></a>00730 }
<a name="l00731"></a>00731 }
<a name="l00732"></a>00732
<a name="l00733"></a>00733 <span class="comment">// get the supported channel number options</span>
<a name="l00734"></a>00734 <span class="keywordtype">void</span> CMMFRawFormatWrite::GetSupportedNumChannelsL(RArray<TUint>& aNumChannels)
<a name="l00735"></a>00735 {
<a name="l00736"></a>00736 aNumChannels.Reset();
<a name="l00737"></a>00737 User::LeaveIfError(aNumChannels.Append(KMono));
<a name="l00738"></a>00738 User::LeaveIfError(aNumChannels.Append(KStereo));
<a name="l00739"></a>00739 }
<a name="l00740"></a>00740
<a name="l00741"></a>00741 <span class="comment">// set maximum clip size</span>
<a name="l00742"></a>00742 <span class="keywordtype">void</span> CMMFRawFormatWrite::SetMaximumClipSize(TInt aBytes)
<a name="l00743"></a>00743 {
<a name="l00744"></a>00744 iMaximumClipSize = aBytes;
<a name="l00745"></a>00745 }
<a name="l00746"></a>00746
<a name="l00747"></a>00747 <span class="comment">// get the supported codecs</span>
<a name="l00748"></a>00748 <span class="keywordtype">void</span> CMMFRawFormatWrite::GetSupportedDataTypesL(TMediaId aMediaId, RArray<TFourCC>& aDataTypes)
<a name="l00749"></a>00749 {
<a name="l00750"></a>00750 <span class="keywordflow">if</span> (aMediaId.iMediaType != KUidMediaTypeAudio)
<a name="l00751"></a>00751 User::Leave(KErrNotSupported);
<a name="l00752"></a>00752 aDataTypes.Reset();
<a name="l00753"></a>00753 User::LeaveIfError(aDataTypes.Append(KMMFFourCCCodePCM16));
<a name="l00754"></a>00754 User::LeaveIfError(aDataTypes.Append(KMMFFourCCCodePCM16B));
<a name="l00755"></a>00755 User::LeaveIfError(aDataTypes.Append(KMMFFourCCCodePCMU16));
<a name="l00756"></a>00756 User::LeaveIfError(aDataTypes.Append(KMMFFourCCCodeIMAD));
<a name="l00757"></a>00757 User::LeaveIfError(aDataTypes.Append(KMMFFourCCCodeIMAS));
<a name="l00758"></a>00758 }
<a name="l00759"></a>00759
<a name="l00760"></a>00760
<a name="l00761"></a>00761 <span class="comment">// __________________________________________________________________________</span>
<a name="l00762"></a>00762 <span class="comment">// Exported proxy for instantiation method resolution</span>
<a name="l00763"></a>00763 <span class="comment">// Define the interface UIDs</span>
<a name="l00764"></a>00764
<a name="l00765"></a>00765 <span class="keyword">const</span> TImplementationProxy ImplementationTable[] =
<a name="l00766"></a>00766 {
<a name="l00767"></a>00767 IMPLEMENTATION_PROXY_ENTRY(KRawDecoder, CMMFRawFormatRead::NewL),
<a name="l00768"></a>00768 IMPLEMENTATION_PROXY_ENTRY(KRawEncoder, CMMFRawFormatWrite::NewL)
<a name="l00769"></a>00769 };
<a name="l00770"></a>00770
<a name="l00771"></a>00771 EXPORT_C <span class="keyword">const</span> TImplementationProxy* ImplementationGroupProxy(TInt& aTableCount)
<a name="l00772"></a>00772 {
<a name="l00773"></a>00773 aTableCount = <span class="keyword">sizeof</span>(ImplementationTable) / <span class="keyword">sizeof</span>(TImplementationProxy);
<a name="l00774"></a>00774
<a name="l00775"></a>00775 <span class="keywordflow">return</span> ImplementationTable;
<a name="l00776"></a>00776 }
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