Symbian3/Examples/guid-6013a680-57f9-415b-8851-c4fa63356636/_audio_stream_engine_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/ForumNokia/AudioStreamExample/src/AudioStreamEngine.cpp</h1><div class="fragment"><pre class="fragment"><a name="l00001"></a>00001 <span class="comment">/*</span>
<a name="l00002"></a>00002 <span class="comment"> * Copyright © 2008 Nokia Corporation.</span>
<a name="l00003"></a>00003 <span class="comment"> */</span>
<a name="l00004"></a>00004
<a name="l00005"></a>00005 <span class="preprocessor">#include <mda\common\audio.h></span>
<a name="l00006"></a>00006 <span class="preprocessor">#include <mmf\common\mmfutilities.h></span>
<a name="l00007"></a>00007 <span class="preprocessor">#include <MdaAudioInputStream.h></span> <span class="comment">// audio input stream</span>
<a name="l00008"></a>00008 <span class="preprocessor">#include <MdaAudioOutputStream.h></span> <span class="comment">// audio output stream</span>
<a name="l00009"></a>00009 <span class="preprocessor">#include <s32file.h></span> <span class="comment">// RFileWriteStream and RFileReadStream</span>
<a name="l00010"></a>00010
<a name="l00011"></a>00011 <span class="preprocessor">#include "AudioStreamEngine.h"</span>
<a name="l00012"></a>00012 <span class="preprocessor">#include "audiostream.pan"</span>
<a name="l00013"></a>00013
<a name="l00014"></a>00014 <span class="comment">// Audio data buffer size.</span>
<a name="l00015"></a>00015 <span class="comment">// In both 3rd Edition and 2nd Edition the total buffer (iStreamBuffer) size is </span>
<a name="l00016"></a>00016 <span class="comment">// KFrameSizePCM * KFrameCountPCM = 40960 bytes. This will contain 2560 ms </span>
<a name="l00017"></a>00017 <span class="comment">// of 16-bit audio data. </span>
<a name="l00018"></a>00018 <span class="comment">// In 3rd Edition the KFrameSizePCM is 4096 bytes, because CMdaAudioInputStream::ReadL() </span>
<a name="l00019"></a>00019 <span class="comment">// returns audio data in 4096-byte chunks. In 2nd Edition, ReadL() returns data in 320-byte</span>
<a name="l00020"></a>00020 <span class="comment">// chunks.</span>
<a name="l00021"></a>00021 <span class="keyword">const</span> TInt KFrameSizePCM = 4096;
<a name="l00022"></a>00022 <span class="keyword">const</span> TInt KFrameCountPCM = 100;
<a name="l00023"></a>00023
<a name="l00024"></a>00024 <span class="comment">// Audio data buffer size for AMR encoding. For AMR, the buffer size is the same in</span>
<a name="l00025"></a>00025 <span class="comment">// both 2nd and 3rd Edition devices (20 ms per frame, a total of 2560 ms in 128 frames).</span>
<a name="l00026"></a>00026 <span class="keyword">const</span> TInt KFrameSizeAMR = 14;
<a name="l00027"></a>00027 <span class="keyword">const</span> TInt KFrameCountAMR = 128;
<a name="l00028"></a>00028 <span class="comment">// Header data for an AMR-encoded audio file</span>
<a name="l00029"></a>00029 <span class="keyword">const</span> TInt KAMRHeaderLength=6;
<a name="l00030"></a>00030 <span class="keyword">const</span> TUint8 KAMRNBHeader[KAMRHeaderLength] = { 0x23, 0x21, 0x41, 0x4d, 0x52, 0x0a };
<a name="l00031"></a>00031
<a name="l00032"></a>00032 <span class="comment">// Files to store the sample audio clips</span>
<a name="l00033"></a>00033 <a class="code" href="secureclientandserver_8h.html#a5eadd4429627d82193b37536d4faa03a">_LIT</a>(KAudioFilePCM, <span class="stringliteral">"sample.aud"</span>);
<a name="l00034"></a>00034 <a class="code" href="secureclientandserver_8h.html#a5eadd4429627d82193b37536d4faa03a">_LIT</a>(KAudioFileAMR, <span class="stringliteral">"sample.amr"</span>);
<a name="l00035"></a>00035
<a name="l00036"></a>00036
<a name="l00037"></a><a class="code" href="class_c_audio_stream_engine.html#a642c7bef4022a84b0235c87046e261fe">00037</a> <a class="code" href="class_c_audio_stream_engine.html">CAudioStreamEngine</a>* <a class="code" href="class_c_audio_stream_engine.html#a642c7bef4022a84b0235c87046e261fe">CAudioStreamEngine::NewL</a>(<a class="code" href="class_c_audio_stream_app_ui.html">CAudioStreamAppUi</a>* aAppUi)
<a name="l00038"></a>00038 {
<a name="l00039"></a>00039 <a class="code" href="class_c_audio_stream_engine.html">CAudioStreamEngine</a>* <span class="keyword">self</span> = <a class="code" href="class_c_audio_stream_engine.html#a91672b67faf4b872f536dfa30a0cb087">CAudioStreamEngine::NewLC</a>(aAppUi);
<a name="l00040"></a>00040 CleanupStack::Pop(<span class="keyword">self</span>);
<a name="l00041"></a>00041 <span class="keywordflow">return</span> <span class="keyword">self</span>;
<a name="l00042"></a>00042 }
<a name="l00043"></a>00043
<a name="l00044"></a><a class="code" href="class_c_audio_stream_engine.html#a91672b67faf4b872f536dfa30a0cb087">00044</a> <a class="code" href="class_c_audio_stream_engine.html">CAudioStreamEngine</a>* <a class="code" href="class_c_audio_stream_engine.html#a91672b67faf4b872f536dfa30a0cb087">CAudioStreamEngine::NewLC</a>(<a class="code" href="class_c_audio_stream_app_ui.html">CAudioStreamAppUi</a>* aAppUi)
<a name="l00045"></a>00045 {
<a name="l00046"></a>00046 <a class="code" href="class_c_audio_stream_engine.html">CAudioStreamEngine</a>* <span class="keyword">self</span> = <span class="keyword">new</span> (ELeave) <a class="code" href="class_c_audio_stream_engine.html">CAudioStreamEngine</a>(aAppUi);
<a name="l00047"></a>00047 CleanupStack::PushL(<span class="keyword">self</span>);
<a name="l00048"></a>00048 <span class="keyword">self</span>->ConstructL();
<a name="l00049"></a>00049 <span class="keywordflow">return</span> <span class="keyword">self</span>;
<a name="l00050"></a>00050 }
<a name="l00051"></a>00051
<a name="l00052"></a>00052 <span class="comment">// Standard EPOC 2nd phase constructor</span>
<a name="l00053"></a>00053 <span class="keywordtype">void</span> CAudioStreamEngine::ConstructL()
<a name="l00054"></a>00054 {
<a name="l00055"></a>00055 <span class="comment">// Construct streams. We need to construct these here, so that at least the input stream</span>
<a name="l00056"></a>00056 <span class="comment">// exists if SetEncodingL() is called before any recording has taken place </span>
<a name="l00057"></a>00057 iInputStream = <a class="code" href="class_c_audio_stream_engine.html#a642c7bef4022a84b0235c87046e261fe">CMdaAudioInputStream::NewL</a>(*<span class="keyword">this</span>);
<a name="l00058"></a>00058 iOutputStream = <a class="code" href="class_c_audio_stream_engine.html#a642c7bef4022a84b0235c87046e261fe">CMdaAudioOutputStream::NewL</a>(*<span class="keyword">this</span>);
<a name="l00059"></a>00059
<a name="l00060"></a>00060 <span class="comment">// Get a handle to the RFs session to be used (owned by CEikonEnv, NOT to be closed</span>
<a name="l00061"></a>00061 <span class="comment">// when this application exits!) </span>
<a name="l00062"></a>00062 iFs = CEikonEnv::Static()->FsSession();
<a name="l00063"></a>00063
<a name="l00064"></a>00064 <span class="comment">// Save the default encoding for later reference (the encoding is the same for</span>
<a name="l00065"></a>00065 <span class="comment">// both input and output streams).</span>
<a name="l00066"></a>00066 iDefaultEncoding = iInputStream->DataType();
<a name="l00067"></a>00067 <span class="comment">// At first we are using the default encoding.</span>
<a name="l00068"></a>00068 iCurrentEncoding = iDefaultEncoding;
<a name="l00069"></a>00069
<a name="l00070"></a>00070 <span class="comment">// Stream buffer allocation (by default for PCM)</span>
<a name="l00071"></a>00071 iStreamBuffer = HBufC8::NewMaxL(iFrameSize * iFrameCount);
<a name="l00072"></a>00072 iStreamStart=0;
<a name="l00073"></a>00073 iStreamEnd=iFrameCount - 1;
<a name="l00074"></a>00074
<a name="l00075"></a>00075 <span class="comment">// The sample.aud/amr can be found in \private<UID3>\ folder</span>
<a name="l00076"></a>00076 User::LeaveIfError( iFs.CreatePrivatePath( EDriveC ) );
<a name="l00077"></a>00077 User::LeaveIfError( iFs.SetSessionToPrivate( EDriveC ) );
<a name="l00078"></a>00078
<a name="l00079"></a>00079 iStop = <a class="code" href="class_c_audio_stream_engine.html#a642c7bef4022a84b0235c87046e261fe">CIdle::NewL</a>( CActive::EPriorityIdle );
<a name="l00080"></a>00080 }
<a name="l00081"></a>00081
<a name="l00082"></a>00082 <span class="comment">// ----------------------------------------------------------------------------</span>
<a name="l00083"></a>00083 <span class="comment">// CAudioStreamEngine::CAudioStreamEngine(</span>
<a name="l00084"></a>00084 <span class="comment">// CAudioStreamAppUi* aAppUi)</span>
<a name="l00085"></a>00085 <span class="comment">//</span>
<a name="l00086"></a>00086 <span class="comment">// onstructor</span>
<a name="l00087"></a>00087 <span class="comment">// ----------------------------------------------------------------------------</span>
<a name="l00088"></a>00088 CAudioStreamEngine::CAudioStreamEngine(<a class="code" href="class_c_audio_stream_app_ui.html">CAudioStreamAppUi</a>* aAppUi)
<a name="l00089"></a>00089 : iAppUi(aAppUi), iUseAMR(EFalse), iAudioFile(KAudioFilePCM), iFrameSize(KFrameSizePCM),
<a name="l00090"></a>00090 iFrameCount(KFrameCountPCM), iStreamBuffer(0), iFramePtr(0,0), iBufferOK(EFalse)
<a name="l00091"></a>00091 {
<a name="l00092"></a>00092 <span class="comment">// By default we use PCM and initialise the instance variables accordingly above.</span>
<a name="l00093"></a>00093
<a name="l00094"></a>00094 <span class="comment">// Initial audio stream properties for input and output, 8KHz mono. </span>
<a name="l00095"></a>00095 <span class="comment">// These settings could also be set/changed using method SetAudioPropertiesL() of</span>
<a name="l00096"></a>00096 <span class="comment">// the input and output streams.</span>
<a name="l00097"></a>00097 iStreamSettings.iChannels=TMdaAudioDataSettings::EChannelsMono;
<a name="l00098"></a>00098 iStreamSettings.iSampleRate=TMdaAudioDataSettings::ESampleRate8000Hz;
<a name="l00099"></a>00099 }
<a name="l00100"></a>00100
<a name="l00101"></a>00101 <span class="comment">// ----------------------------------------------------------------------------</span>
<a name="l00102"></a>00102 <span class="comment">// CAudioStreamEngine::~CAudioStreamEngine()</span>
<a name="l00103"></a>00103 <span class="comment">//</span>
<a name="l00104"></a>00104 <span class="comment">// destructor</span>
<a name="l00105"></a>00105 <span class="comment">// ----------------------------------------------------------------------------</span>
<a name="l00106"></a><a class="code" href="class_c_audio_stream_engine.html#a4da8b5eecd664fea1aea40a95adc03fa">00106</a> <a class="code" href="class_c_audio_stream_engine.html#a4da8b5eecd664fea1aea40a95adc03fa">CAudioStreamEngine::~CAudioStreamEngine</a>()
<a name="l00107"></a>00107 {
<a name="l00108"></a>00108 <span class="keywordflow">if</span> (iInputStream)
<a name="l00109"></a>00109 {
<a name="l00110"></a>00110 <span class="keywordflow">if</span> (iInputStatus!=ENotReady)
<a name="l00111"></a>00111 {
<a name="l00112"></a>00112 iInputStream->Stop();
<a name="l00113"></a>00113 }
<a name="l00114"></a>00114 <span class="keyword">delete</span> iInputStream;
<a name="l00115"></a>00115 }
<a name="l00116"></a>00116
<a name="l00117"></a>00117 <span class="keywordflow">if</span> (iOutputStream)
<a name="l00118"></a>00118 {
<a name="l00119"></a>00119 <span class="keywordflow">if</span> (iOutputStatus!=ENotReady)
<a name="l00120"></a>00120 {
<a name="l00121"></a>00121 iOutputStream->Stop();
<a name="l00122"></a>00122 }
<a name="l00123"></a>00123 <span class="keyword">delete</span> iOutputStream;
<a name="l00124"></a>00124 }
<a name="l00125"></a>00125
<a name="l00126"></a>00126 <span class="keywordflow">if</span> (iStreamBuffer)
<a name="l00127"></a>00127 {
<a name="l00128"></a>00128 <span class="keyword">delete</span> iStreamBuffer;
<a name="l00129"></a>00129 }
<a name="l00130"></a>00130 <span class="keywordflow">if</span> (iStop)
<a name="l00131"></a>00131 {
<a name="l00132"></a>00132 iStop->Cancel();
<a name="l00133"></a>00133 }
<a name="l00134"></a>00134 <span class="keyword">delete</span> iStop;
<a name="l00135"></a>00135 }
<a name="l00136"></a>00136
<a name="l00137"></a>00137
<a name="l00138"></a>00138 <span class="comment">// ----------------------------------------------------------------------------</span>
<a name="l00139"></a>00139 <span class="comment">// CAudioStreamEngine::Play()</span>
<a name="l00140"></a>00140 <span class="comment">//</span>
<a name="l00141"></a>00141 <span class="comment">// plays the audio data contained in the buffer</span>
<a name="l00142"></a>00142 <span class="comment">// ----------------------------------------------------------------------------</span>
<a name="l00143"></a><a class="code" href="class_c_audio_stream_engine.html#af71152acf3592c67fec809e00c7246ff">00143</a> <span class="keywordtype">void</span> <a class="code" href="class_c_audio_stream_engine.html#af71152acf3592c67fec809e00c7246ff">CAudioStreamEngine::Play</a>()
<a name="l00144"></a>00144 {
<a name="l00145"></a>00145 ShowMessage(_L(<span class="stringliteral">"Play "</span>), ETrue);
<a name="l00146"></a>00146 <span class="comment">// if either stream is active, return</span>
<a name="l00147"></a>00147 <span class="keywordflow">if</span> (iInputStatus!=ENotReady || iOutputStatus!=ENotReady)
<a name="l00148"></a>00148 {
<a name="l00149"></a>00149 ShowMessage(_L(<span class="stringliteral">"Stream in use, \ncannot play audio."</span>), ETrue);
<a name="l00150"></a>00150 <span class="keywordflow">return</span>;
<a name="l00151"></a>00151 }
<a name="l00152"></a>00152
<a name="l00153"></a>00153 <span class="keywordflow">if</span>(!iBufferOK)
<a name="l00154"></a>00154 {
<a name="l00155"></a>00155 ShowMessage(_L(<span class="stringliteral">"Nothing to play - \nrecord or load \na file first."</span>), ETrue);
<a name="l00156"></a>00156 <span class="keywordflow">return</span>;
<a name="l00157"></a>00157 }
<a name="l00158"></a>00158
<a name="l00159"></a>00159 <span class="comment">// Open output stream.</span>
<a name="l00160"></a>00160 <span class="comment">// Upon completion will receive callback in </span>
<a name="l00161"></a>00161 <span class="comment">// MMdaAudioOutputStreamCallback::MaoscOpenComplete().</span>
<a name="l00162"></a>00162 iOutputStream->Open(&iStreamSettings);
<a name="l00163"></a>00163 }
<a name="l00164"></a>00164
<a name="l00165"></a>00165
<a name="l00166"></a>00166 <span class="comment">// ----------------------------------------------------------------------------</span>
<a name="l00167"></a>00167 <span class="comment">// CAudioStreamEngine::Record()</span>
<a name="l00168"></a>00168 <span class="comment">//</span>
<a name="l00169"></a>00169 <span class="comment">// records audio data into the buffer</span>
<a name="l00170"></a>00170 <span class="comment">// ----------------------------------------------------------------------------</span>
<a name="l00171"></a><a class="code" href="class_c_audio_stream_engine.html#a7b74589268bba7a746628c9712d7567f">00171</a> <span class="keywordtype">void</span> <a class="code" href="class_c_audio_stream_engine.html#a7b74589268bba7a746628c9712d7567f">CAudioStreamEngine::Record</a>()
<a name="l00172"></a>00172 {
<a name="l00173"></a>00173 <span class="comment">// If either stream is active, return</span>
<a name="l00174"></a>00174 <span class="keywordflow">if</span> (iInputStatus!=ENotReady || iOutputStatus!=ENotReady)
<a name="l00175"></a>00175 {
<a name="l00176"></a>00176 ShowMessage(_L(<span class="stringliteral">"Stream in use, \ncannot record audio."</span>), ETrue);
<a name="l00177"></a>00177 <span class="keywordflow">return</span>;
<a name="l00178"></a>00178 }
<a name="l00179"></a>00179
<a name="l00180"></a>00180 <span class="comment">// Open input stream.</span>
<a name="l00181"></a>00181 <span class="comment">// Upon completion will receive callback in </span>
<a name="l00182"></a>00182 <span class="comment">// MMdaAudioInputStreamCallback::MaiscOpenComplete().</span>
<a name="l00183"></a>00183 iInputStream->Open(&iStreamSettings);
<a name="l00184"></a>00184 }
<a name="l00185"></a>00185
<a name="l00186"></a>00186 <span class="comment">// ----------------------------------------------------------------------------</span>
<a name="l00187"></a>00187 <span class="comment">// CAudioStreamEngine::Stop()</span>
<a name="l00188"></a>00188 <span class="comment">//</span>
<a name="l00189"></a>00189 <span class="comment">// stops playing/recording</span>
<a name="l00190"></a>00190 <span class="comment">// ----------------------------------------------------------------------------</span>
<a name="l00191"></a><a class="code" href="class_c_audio_stream_engine.html#a6c3450de52c2fe602ed8dceaed90d6b3">00191</a> <span class="keywordtype">void</span> <a class="code" href="class_c_audio_stream_engine.html#a6c3450de52c2fe602ed8dceaed90d6b3">CAudioStreamEngine::Stop</a>()
<a name="l00192"></a>00192 {
<a name="l00193"></a>00193 <span class="comment">// if input or output streams are active, close them</span>
<a name="l00194"></a>00194 <span class="keywordflow">if</span> (iInputStatus!=ENotReady)
<a name="l00195"></a>00195 {
<a name="l00196"></a>00196 iInputStream->Stop();
<a name="l00197"></a>00197 ShowMessage(_L(<span class="stringliteral">"\nRecording stopped!"</span>), ETrue);
<a name="l00198"></a>00198 iBufferOK = ETrue;
<a name="l00199"></a>00199 iInputStatus = ENotReady;
<a name="l00200"></a>00200 }
<a name="l00201"></a>00201 <span class="keywordflow">if</span> (iOutputStatus!=ENotReady)
<a name="l00202"></a>00202 {
<a name="l00203"></a>00203 iOutputStream->Stop();
<a name="l00204"></a>00204 iOutputStatus = ENotReady;
<a name="l00205"></a>00205 ShowMessage(_L(<span class="stringliteral">"\nPlayback stopped!"</span>), ETrue);
<a name="l00206"></a>00206 }
<a name="l00207"></a>00207 }
<a name="l00208"></a>00208
<a name="l00209"></a>00209
<a name="l00210"></a>00210 <span class="comment">// ----------------------------------------------------------------------------</span>
<a name="l00211"></a>00211 <span class="comment">// CAudioStreamEngine::LoadAudioFileL()</span>
<a name="l00212"></a>00212 <span class="comment">//</span>
<a name="l00213"></a>00213 <span class="comment">// loads the audio data from a file into the buffer</span>
<a name="l00214"></a>00214 <span class="comment">// ----------------------------------------------------------------------------</span>
<a name="l00215"></a><a class="code" href="class_c_audio_stream_engine.html#a2cd495294ea2a4cadfd9816b60acd587">00215</a> <span class="keywordtype">void</span> <a class="code" href="class_c_audio_stream_engine.html#a2cd495294ea2a4cadfd9816b60acd587">CAudioStreamEngine::LoadAudioFileL</a>()
<a name="l00216"></a>00216 {
<a name="l00217"></a>00217 RFileReadStream audiofile;
<a name="l00218"></a>00218
<a name="l00219"></a>00219 <span class="comment">// open file</span>
<a name="l00220"></a>00220 TFileName fileName;
<a name="l00221"></a>00221 fileName.Copy(iAudioFilePath);
<a name="l00222"></a>00222 fileName.Append(iAudioFile);
<a name="l00223"></a>00223
<a name="l00224"></a>00224 TInt err = audiofile.Open(iFs, fileName, EFileRead|EFileStream);
<a name="l00225"></a>00225 iStreamBuffer->Des().FillZ(iFrameCount * iFrameSize); <span class="comment">// Empty the stream buffer</span>
<a name="l00226"></a>00226 <span class="keywordflow">if</span> (err==KErrNone)
<a name="l00227"></a>00227 {
<a name="l00228"></a>00228 <span class="comment">// file opened ok, proceed reading</span>
<a name="l00229"></a>00229 <span class="keywordflow">if</span> (iUseAMR)
<a name="l00230"></a>00230 {
<a name="l00231"></a>00231 <span class="comment">// Read the AMR header (the first 6 bytes). We don't need to save/use the header,</span>
<a name="l00232"></a>00232 <span class="comment">// since while playback we already know it's an AMR-NB encoded stream.</span>
<a name="l00233"></a>00233 TBuf8<KAMRHeaderLength> temp;
<a name="l00234"></a>00234 audiofile.ReadL(temp, KAMRHeaderLength);
<a name="l00235"></a>00235 }
<a name="l00236"></a>00236
<a name="l00237"></a>00237 TUint idx=0;
<a name="l00238"></a>00238 <span class="keywordflow">while</span> (idx < iFrameCount)
<a name="l00239"></a>00239 {
<a name="l00240"></a>00240 TRAPD(fstatus, audiofile.ReadL(GetFrame(idx), iFrameSize));
<a name="l00241"></a>00241 <span class="keywordflow">if</span> (fstatus!=KErrNone)
<a name="l00242"></a>00242 <span class="keywordflow">break</span>;
<a name="l00243"></a>00243 idx++;
<a name="l00244"></a>00244 }
<a name="l00245"></a>00245 iStreamStart=0;
<a name="l00246"></a>00246 iStreamEnd=idx-1;
<a name="l00247"></a>00247 ShowMessage(_L(<span class="stringliteral">"Loading complete!"</span>), ETrue);
<a name="l00248"></a>00248 iBufferOK = ETrue;
<a name="l00249"></a>00249 }
<a name="l00250"></a>00250 <span class="keywordflow">else</span>
<a name="l00251"></a>00251 {
<a name="l00252"></a>00252 <span class="comment">// failed to open file</span>
<a name="l00253"></a>00253 ShowMessage(_L(<span class="stringliteral">"Error loading \naudio sample!"</span>), ETrue);
<a name="l00254"></a>00254 iBufferOK = EFalse;
<a name="l00255"></a>00255 }
<a name="l00256"></a>00256 audiofile.Close();
<a name="l00257"></a>00257 }
<a name="l00258"></a>00258
<a name="l00259"></a>00259
<a name="l00260"></a>00260 <span class="comment">// ----------------------------------------------------------------------------</span>
<a name="l00261"></a>00261 <span class="comment">// CAudioStreamEngine::SaveAudioFileL()</span>
<a name="l00262"></a>00262 <span class="comment">//</span>
<a name="l00263"></a>00263 <span class="comment">// saves the audio data in the buffer into a file</span>
<a name="l00264"></a>00264 <span class="comment">// ----------------------------------------------------------------------------</span>
<a name="l00265"></a><a class="code" href="class_c_audio_stream_engine.html#af2c0f47a5bca2d3d960ea1433696b376">00265</a> <span class="keywordtype">void</span> <a class="code" href="class_c_audio_stream_engine.html#af2c0f47a5bca2d3d960ea1433696b376">CAudioStreamEngine::SaveAudioFileL</a>()
<a name="l00266"></a>00266 {
<a name="l00267"></a>00267 <span class="keywordflow">if</span> (!iBufferOK)
<a name="l00268"></a>00268 {
<a name="l00269"></a>00269 <span class="comment">// In case the encoding was changed between recording and trying to save the file</span>
<a name="l00270"></a>00270 ShowMessage(_L(<span class="stringliteral">"Recorded buffer does not \nmatch current encoding."</span>), ETrue);
<a name="l00271"></a>00271 ShowMessage(_L(<span class="stringliteral">"\nPlease re-record and \ntry again."</span>), EFalse);
<a name="l00272"></a>00272 <span class="keywordflow">return</span>;
<a name="l00273"></a>00273 }
<a name="l00274"></a>00274 RFileWriteStream audiofile;
<a name="l00275"></a>00275
<a name="l00276"></a>00276 <span class="comment">// Check for free space for saving the sample</span>
<a name="l00277"></a>00277 TVolumeInfo volinfo;
<a name="l00278"></a>00278 TInt err=iFs.Volume(volinfo,EDriveC);
<a name="l00279"></a>00279 <span class="keywordflow">if</span> ( volinfo.iFree<(iFrameCount*iFrameSize))
<a name="l00280"></a>00280 {
<a name="l00281"></a>00281 <span class="comment">// Not enough free space on drive for saving, report and exit</span>
<a name="l00282"></a>00282 ShowMessage(_L(<span class="stringliteral">"Cannot save file:\nnot enough space!"</span>), ETrue);
<a name="l00283"></a>00283 <span class="keywordflow">return</span>;
<a name="l00284"></a>00284 }
<a name="l00285"></a>00285
<a name="l00286"></a>00286 TFileName fileName;
<a name="l00287"></a>00287 fileName.Copy(iAudioFilePath);
<a name="l00288"></a>00288 fileName.Append(iAudioFile);
<a name="l00289"></a>00289 err = audiofile.Replace(iFs, fileName, EFileWrite|EFileStream);
<a name="l00290"></a>00290 <span class="keywordflow">if</span> (err==KErrNone)
<a name="l00291"></a>00291 {
<a name="l00292"></a>00292 <span class="keywordflow">if</span> (iUseAMR)
<a name="l00293"></a>00293 {
<a name="l00294"></a>00294 <span class="comment">// Write the six-byte AMR header, so that the file can be used by other</span>
<a name="l00295"></a>00295 <span class="comment">// applications as well.</span>
<a name="l00296"></a>00296 <span class="keywordflow">for</span> (<span class="keywordtype">int</span> i = 0; i < KAMRHeaderLength; i++)
<a name="l00297"></a>00297 audiofile.WriteUint8L(KAMRNBHeader[i]);
<a name="l00298"></a>00298 }
<a name="l00299"></a>00299
<a name="l00300"></a>00300 <span class="comment">// File opened ok, proceed writing.</span>
<a name="l00301"></a>00301 <span class="comment">// Write audio data directly from iStreamBuffer</span>
<a name="l00302"></a>00302 <span class="keywordflow">for</span> (TUint idx=iStreamStart; idx<=iStreamEnd; idx++)<span class="comment">//iFrameCount; idx++)</span>
<a name="l00303"></a>00303 {
<a name="l00304"></a>00304 audiofile.WriteL(GetFrame(idx));
<a name="l00305"></a>00305 }
<a name="l00306"></a>00306 ShowMessage(_L(<span class="stringliteral">"Saving complete!"</span>), ETrue);
<a name="l00307"></a>00307 }
<a name="l00308"></a>00308 <span class="keywordflow">else</span>
<a name="l00309"></a>00309 {
<a name="l00310"></a>00310 <span class="comment">// failed to open file</span>
<a name="l00311"></a>00311 ShowMessage(_L(<span class="stringliteral">"Error saving \naudio sample!"</span>), ETrue);
<a name="l00312"></a>00312 }
<a name="l00313"></a>00313 audiofile.Close();
<a name="l00314"></a>00314 }
<a name="l00315"></a>00315
<a name="l00316"></a>00316 <span class="comment">// ----------------------------------------------------------------------------</span>
<a name="l00317"></a>00317 <span class="comment">// CAudioStreamEngine::SetEncodingL(TBool aAmr)</span>
<a name="l00318"></a>00318 <span class="comment">//</span>
<a name="l00319"></a>00319 <span class="comment">// If argument is ETrue, AMR-NB encoding will be used in audio input/output.</span>
<a name="l00320"></a>00320 <span class="comment">// If EFalse, the default PCM is used. If the platform does not support AMR-NB,</span>
<a name="l00321"></a>00321 <span class="comment">// PCM will be used no matter what the argument's value is.</span>
<a name="l00322"></a>00322 <span class="comment">// ----------------------------------------------------------------------------</span>
<a name="l00323"></a><a class="code" href="class_c_audio_stream_engine.html#a939d7fb72ca466a389e413d680faafcd">00323</a> <span class="keywordtype">void</span> <a class="code" href="class_c_audio_stream_engine.html#a939d7fb72ca466a389e413d680faafcd">CAudioStreamEngine::SetEncodingL</a>(TBool aAmr)
<a name="l00324"></a>00324 {
<a name="l00325"></a>00325 <span class="comment">// Act only if the new encoding differs from the current one</span>
<a name="l00326"></a>00326 <span class="keywordflow">if</span> (iUseAMR != aAmr)
<a name="l00327"></a>00327 {
<a name="l00328"></a>00328 iUseAMR = aAmr;
<a name="l00329"></a>00329 <span class="keywordflow">if</span> (iUseAMR)
<a name="l00330"></a>00330 {
<a name="l00331"></a>00331 <span class="comment">// Try to set AMR-NB encoding, this will indicate whether it is supported</span>
<a name="l00332"></a>00332 <span class="comment">// by the platform or not.</span>
<a name="l00333"></a>00333 TRAPD(err, iInputStream->SetDataTypeL(KMMFFourCCCodeAMR));
<a name="l00334"></a>00334 <span class="keywordflow">if</span> (err != KErrNone)
<a name="l00335"></a>00335 {
<a name="l00336"></a>00336 ShowMessage(_L(<span class="stringliteral">"AMR-NB not supported,\nusing PCM."</span>), ETrue);
<a name="l00337"></a>00337 iCurrentEncoding = iDefaultEncoding;
<a name="l00338"></a>00338 iUseAMR = EFalse;
<a name="l00339"></a>00339 <span class="comment">// We do not need to invalidate the buffer or change buffer settings, </span>
<a name="l00340"></a>00340 <span class="comment">// since the encoding was not changed -> just return.</span>
<a name="l00341"></a>00341 <span class="keywordflow">return</span>;
<a name="l00342"></a>00342 }
<a name="l00343"></a>00343 <span class="keywordflow">else</span>
<a name="l00344"></a>00344 {
<a name="l00345"></a>00345 iCurrentEncoding = KMMFFourCCCodeAMR;
<a name="l00346"></a>00346 iAudioFile.Zero(); <span class="comment">// Empty the audio file name </span>
<a name="l00347"></a>00347 iAudioFile.Append(KAudioFileAMR);
<a name="l00348"></a>00348 iFrameCount = KFrameCountAMR;
<a name="l00349"></a>00349 iFrameSize = KFrameSizeAMR;
<a name="l00350"></a>00350 ShowMessage(_L(<span class="stringliteral">"Encoding set to AMR-NB."</span>), ETrue);
<a name="l00351"></a>00351 }
<a name="l00352"></a>00352 }
<a name="l00353"></a>00353 <span class="keywordflow">else</span>
<a name="l00354"></a>00354 {
<a name="l00355"></a>00355 <span class="comment">// If we get here, the encoding has previously been changed to AMR. Switch back to</span>
<a name="l00356"></a>00356 <span class="comment">// PCM.</span>
<a name="l00357"></a>00357 iCurrentEncoding = iDefaultEncoding;
<a name="l00358"></a>00358 iAudioFile.Zero(); <span class="comment">// Empty the audio file name </span>
<a name="l00359"></a>00359 iAudioFile.Append(KAudioFilePCM);
<a name="l00360"></a>00360 iFrameCount = KFrameCountPCM;
<a name="l00361"></a>00361 iFrameSize = KFrameSizePCM;
<a name="l00362"></a>00362 ShowMessage(_L(<span class="stringliteral">"Encoding set to PCM."</span>), ETrue);
<a name="l00363"></a>00363 }
<a name="l00364"></a>00364
<a name="l00365"></a>00365 <span class="comment">// Make sure the user re-records or reloads the audio file, so that we do not </span>
<a name="l00366"></a>00366 <span class="comment">// accidentally try to play PCM data using AMR or vice versa.</span>
<a name="l00367"></a>00367 iBufferOK = EFalse;
<a name="l00368"></a>00368 <span class="keywordflow">if</span> (iStreamBuffer) <span class="keyword">delete</span> iStreamBuffer;
<a name="l00369"></a>00369 iStreamBuffer = NULL; <span class="comment">// In case the following NewL leaves</span>
<a name="l00370"></a>00370 iStreamBuffer = HBufC8::NewMaxL(iFrameSize * iFrameCount);
<a name="l00371"></a>00371 iStreamStart=0;
<a name="l00372"></a>00372 iStreamEnd=iFrameCount - 1;
<a name="l00373"></a>00373 }
<a name="l00374"></a>00374 }
<a name="l00375"></a>00375
<a name="l00376"></a>00376 <span class="comment">// ----------------------------------------------------------------------------</span>
<a name="l00377"></a>00377 <span class="comment">// CAudioStreamEngine::ShowMessage(</span>
<a name="l00378"></a>00378 <span class="comment">// const TDesC& aMsg, TBool aReset=EFalse)</span>
<a name="l00379"></a>00379 <span class="comment">//</span>
<a name="l00380"></a>00380 <span class="comment">// displays text referenced by aMsg in the label, will append the aMsg in the </span>
<a name="l00381"></a>00381 <span class="comment">// existing text in label if aReset is EFalse, otherwise will reset the label </span>
<a name="l00382"></a>00382 <span class="comment">// text.</span>
<a name="l00383"></a>00383 <span class="comment">// ----------------------------------------------------------------------------</span>
<a name="l00384"></a>00384 <span class="keywordtype">void</span> CAudioStreamEngine::ShowMessage(<span class="keyword">const</span> TDesC& aMsg, TBool aReset=EFalse)
<a name="l00385"></a>00385 {
<a name="l00386"></a>00386 <span class="keywordflow">if</span> (aReset) <span class="comment">// if ETrue, clear the message on the label prior to output</span>
<a name="l00387"></a>00387 iMsg.Zero();
<a name="l00388"></a>00388 iMsg.Append(aMsg);
<a name="l00389"></a>00389 TRAPD(error, iAppUi->GetView()-><a class="code" href="class_c_audio_stream_view.html#a173b6a9750b0d64f626617fa2809b3c5">ShowMessageL</a>(iMsg));
<a name="l00390"></a>00390 PanicIfError(error);
<a name="l00391"></a>00391 }
<a name="l00392"></a>00392
<a name="l00393"></a>00393 <span class="comment">// ----------------------------------------------------------------------------</span>
<a name="l00394"></a>00394 <span class="comment">// TPtr8& CAudioStreamEngine::GetFrame(TUint aFrameIdx)</span>
<a name="l00395"></a>00395 <span class="comment">//</span>
<a name="l00396"></a>00396 <span class="comment">// Returns a modifiable pointer to a single frame inside the audio buffer </span>
<a name="l00397"></a>00397 <span class="comment">// ----------------------------------------------------------------------------</span>
<a name="l00398"></a>00398 TPtr8& CAudioStreamEngine::GetFrame(TUint aFrameIdx)
<a name="l00399"></a>00399 {
<a name="l00400"></a>00400 __ASSERT_ALWAYS(aFrameIdx < iFrameCount,
<a name="l00401"></a>00401 User::Panic(_L(<span class="stringliteral">"AudioStreamEx"</span>), 1));
<a name="l00402"></a>00402
<a name="l00403"></a>00403 iFramePtr.Set((TUint8*)(iStreamBuffer->Ptr() + (aFrameIdx * iFrameSize)),
<a name="l00404"></a>00404 iFrameSize,
<a name="l00405"></a>00405 iFrameSize);
<a name="l00406"></a>00406 <span class="keywordflow">return</span> iFramePtr;
<a name="l00407"></a>00407 }
<a name="l00408"></a>00408
<a name="l00409"></a>00409 <span class="comment">// ----------------------------------------------------------------------------</span>
<a name="l00410"></a>00410 <span class="comment">// TPtr8& CAudioStreamEngine::GetPlaybackFrames(TUint aLastFrame)</span>
<a name="l00411"></a>00411 <span class="comment">//</span>
<a name="l00412"></a>00412 <span class="comment">// Returns a modifiable pointer to the requested frames inside the audio buffer</span>
<a name="l00413"></a>00413 <span class="comment">// (from the first frame to aLastFrame). </span>
<a name="l00414"></a>00414 <span class="comment">// ----------------------------------------------------------------------------</span>
<a name="l00415"></a>00415 TPtr8& CAudioStreamEngine::GetPlaybackFrames(TUint aLastFrame)
<a name="l00416"></a>00416 {
<a name="l00417"></a>00417 __ASSERT_ALWAYS(aLastFrame < iFrameCount,
<a name="l00418"></a>00418 User::Panic(_L(<span class="stringliteral">"AudioStreamEx"</span>), 2));
<a name="l00419"></a>00419
<a name="l00420"></a>00420 iFramePtr.Set((TUint8*)(iStreamBuffer->Ptr()),
<a name="l00421"></a>00421 (aLastFrame + 1) * iFrameSize,
<a name="l00422"></a>00422 (aLastFrame + 1) * iFrameSize);
<a name="l00423"></a>00423 <span class="keywordflow">return</span> iFramePtr;
<a name="l00424"></a>00424 }
<a name="l00425"></a>00425
<a name="l00426"></a>00426
<a name="l00427"></a>00427 <span class="comment">//</span>
<a name="l00428"></a>00428 <span class="comment">// MMdaAudioInputStream callbacks (MMdaAudioInputStreamCallback)</span>
<a name="l00429"></a>00429 <span class="comment">//</span>
<a name="l00430"></a>00430 <span class="comment">// ----------------------------------------------------------------------------</span>
<a name="l00431"></a>00431 <span class="comment">// CAudioStreamEngine::MaiscOpenComplete(</span>
<a name="l00432"></a>00432 <span class="comment">// TInt aError)</span>
<a name="l00433"></a>00433 <span class="comment">//</span>
<a name="l00434"></a>00434 <span class="comment">// called upon completion of CMdaAudioInputStream::Open(),</span>
<a name="l00435"></a>00435 <span class="comment">// if the stream was opened succesfully (aError==KErrNone), it's ready for use.</span>
<a name="l00436"></a>00436 <span class="comment">// upon succesful open, the first audio data block will be read from the input</span>
<a name="l00437"></a>00437 <span class="comment">// stream.</span>
<a name="l00438"></a>00438 <span class="comment">// ----------------------------------------------------------------------------</span>
<a name="l00439"></a>00439 <span class="keywordtype">void</span> CAudioStreamEngine::MaiscOpenComplete(TInt aError)
<a name="l00440"></a>00440 {
<a name="l00441"></a>00441 <span class="keywordflow">if</span> (aError==KErrNone)
<a name="l00442"></a>00442 {
<a name="l00443"></a>00443 <span class="comment">// Input stream opened succesfully, set status</span>
<a name="l00444"></a>00444 iInputStatus = EOpen;
<a name="l00445"></a>00445 <span class="comment">// Set the data type (encoding)</span>
<a name="l00446"></a>00446 TRAPD(error, iInputStream->SetDataTypeL(iCurrentEncoding));
<a name="l00447"></a>00447 PanicIfError(error);
<a name="l00448"></a>00448
<a name="l00449"></a>00449 <span class="comment">// set stream input gain to maximum</span>
<a name="l00450"></a>00450 iInputStream->SetGain(iInputStream->MaxGain());
<a name="l00451"></a>00451 <span class="comment">// set stream priority to normal and time sensitive</span>
<a name="l00452"></a>00452 iInputStream->SetPriority(EPriorityNormal, EMdaPriorityPreferenceTime);
<a name="l00453"></a>00453 ShowMessage(_L(<span class="stringliteral">"Recording..."</span>), ETrue);
<a name="l00454"></a>00454
<a name="l00455"></a>00455 <span class="comment">// Emtpy the buffer and issue ReadL() to read the first audio data block, </span>
<a name="l00456"></a>00456 <span class="comment">// subsequent calls to ReadL() will be issued </span>
<a name="l00457"></a>00457 <span class="comment">// in MMdaAudioInputStreamCallback::MaiscBufferCopied()</span>
<a name="l00458"></a>00458 iStreamBuffer->Des().FillZ(iFrameCount * iFrameSize);
<a name="l00459"></a>00459 iStreamIdx=0;
<a name="l00460"></a>00460 TRAPD(error2, iInputStream->ReadL(GetFrame(iStreamIdx)));
<a name="l00461"></a>00461 PanicIfError(error2);
<a name="l00462"></a>00462 }
<a name="l00463"></a>00463 <span class="keywordflow">else</span>
<a name="l00464"></a>00464 {
<a name="l00465"></a>00465 <span class="comment">// input stream open failed</span>
<a name="l00466"></a>00466 iInputStatus = ENotReady;
<a name="l00467"></a>00467 ShowMessage(_L(<span class="stringliteral">"Recording failed!"</span>), ETrue);
<a name="l00468"></a>00468 }
<a name="l00469"></a>00469 }
<a name="l00470"></a>00470
<a name="l00471"></a>00471 <span class="comment">// ----------------------------------------------------------------------------</span>
<a name="l00472"></a>00472 <span class="comment">// CAudioStreamEngine::MaiscBufferCopied(</span>
<a name="l00473"></a>00473 <span class="comment">// TInt aError, const TDesC8& aBuffer)</span>
<a name="l00474"></a>00474 <span class="comment">//</span>
<a name="l00475"></a>00475 <span class="comment">// called when a block of audio data has been read and is available at the </span>
<a name="l00476"></a>00476 <span class="comment">// buffer reference *aBuffer. calls to ReadL() will be issued until all blocks</span>
<a name="l00477"></a>00477 <span class="comment">// in the audio data buffer (iStreamBuffer) are filled.</span>
<a name="l00478"></a>00478 <span class="comment">// ----------------------------------------------------------------------------</span>
<a name="l00479"></a>00479 <span class="keywordtype">void</span> CAudioStreamEngine::MaiscBufferCopied(TInt aError, <span class="keyword">const</span> TDesC8& <span class="comment">/*aBuffer*/</span>)
<a name="l00480"></a>00480 {
<a name="l00481"></a>00481 <span class="keywordflow">if</span> (aError!=KErrNone)
<a name="l00482"></a>00482 {
<a name="l00483"></a>00483 <a class="code" href="secureclientandserver_8h.html#a5eadd4429627d82193b37536d4faa03a">_LIT</a>(KMessage,<span class="stringliteral">"Recording error: %d"</span>);
<a name="l00484"></a>00484 HBufC16* message = <a class="code" href="class_c_audio_stream_engine.html#a91672b67faf4b872f536dfa30a0cb087">HBufC16::NewLC</a>(KMessage().Length()+10);
<a name="l00485"></a>00485 message->Des().AppendFormat(KMessage,aError);
<a name="l00486"></a>00486 ShowMessage(*message, ETrue);
<a name="l00487"></a>00487 CleanupStack::PopAndDestroy(); <span class="comment">// message</span>
<a name="l00488"></a>00488 message = NULL;
<a name="l00489"></a>00489 }
<a name="l00490"></a>00490
<a name="l00491"></a>00491 <span class="keywordflow">if</span> (aError==KErrNone)
<a name="l00492"></a>00492 {
<a name="l00493"></a>00493 <span class="comment">// stop recording if at the end of the buffer</span>
<a name="l00494"></a>00494 iStreamIdx++;
<a name="l00495"></a>00495 <span class="keywordflow">if</span> (iStreamIdx == iFrameCount)
<a name="l00496"></a>00496 {
<a name="l00497"></a>00497 ShowMessage(_L(<span class="stringliteral">"\nRecording complete!"</span>), ETrue);
<a name="l00498"></a>00498 iStreamEnd = iStreamIdx - 1;
<a name="l00499"></a>00499 iBufferOK = ETrue;
<a name="l00500"></a>00500
<a name="l00501"></a>00501 <span class="comment">// Playback is complete:</span>
<a name="l00502"></a>00502 <span class="comment">// Start the active object that will stop the stream</span>
<a name="l00503"></a>00503 iStop->Start( TCallBack(BackgroundStop, <span class="keyword">this</span>) );
<a name="l00504"></a>00504 <span class="keywordflow">return</span>;
<a name="l00505"></a>00505 }
<a name="l00506"></a>00506
<a name="l00507"></a>00507 <span class="comment">// issue ReadL() for next frame </span>
<a name="l00508"></a>00508 TRAPD(error, iInputStream->ReadL(GetFrame(iStreamIdx)));
<a name="l00509"></a>00509 PanicIfError(error);
<a name="l00510"></a>00510 }
<a name="l00511"></a>00511 <span class="keywordflow">else</span> <span class="keywordflow">if</span> (aError==KErrAbort)
<a name="l00512"></a>00512 {
<a name="l00513"></a>00513 <span class="comment">// Recording was aborted, due to call to CMdaAudioInputStream::Stop()</span>
<a name="l00514"></a>00514 <span class="comment">// This KErrAbort will occur each time the Stop() method in this class is executed.</span>
<a name="l00515"></a>00515 <span class="comment">// Also, MaiscRecordComplete() will be called after exiting this method.</span>
<a name="l00516"></a>00516 iStreamEnd = iStreamIdx - 1;
<a name="l00517"></a>00517 iBufferOK = ETrue;
<a name="l00518"></a>00518 iInputStatus = ENotReady;
<a name="l00519"></a>00519 }
<a name="l00520"></a>00520 <span class="keywordflow">else</span>
<a name="l00521"></a>00521 {
<a name="l00522"></a>00522 ShowMessage(_L(<span class="stringliteral">"\nError reading data \nfrom input"</span>), ETrue);
<a name="l00523"></a>00523 iInputStatus = ENotReady;
<a name="l00524"></a>00524 }
<a name="l00525"></a>00525 }
<a name="l00526"></a>00526
<a name="l00527"></a>00527
<a name="l00528"></a>00528 TInt CAudioStreamEngine::BackgroundStop( TAny *aStream ) <span class="comment">// static member function</span>
<a name="l00529"></a>00529 {
<a name="l00530"></a>00530 ((<a class="code" href="class_c_audio_stream_engine.html">CAudioStreamEngine</a>*)aStream)->Stop();
<a name="l00531"></a>00531 <span class="keywordflow">return</span> EFalse;
<a name="l00532"></a>00532 }
<a name="l00533"></a>00533
<a name="l00534"></a>00534
<a name="l00535"></a>00535 <span class="comment">// ----------------------------------------------------------------------------</span>
<a name="l00536"></a>00536 <span class="comment">// CAudioStreamEngine::MaiscRecordComplete(</span>
<a name="l00537"></a>00537 <span class="comment">// TInt aError)</span>
<a name="l00538"></a>00538 <span class="comment">//</span>
<a name="l00539"></a>00539 <span class="comment">// called when input stream is closed by CMdaAudioInputStream::Stop()</span>
<a name="l00540"></a>00540 <span class="comment">// ----------------------------------------------------------------------------</span>
<a name="l00541"></a>00541 <span class="keywordtype">void</span> CAudioStreamEngine::MaiscRecordComplete(TInt aError)
<a name="l00542"></a>00542 {
<a name="l00543"></a>00543 iInputStatus = ENotReady;
<a name="l00544"></a>00544 <span class="keywordflow">if</span> (aError==KErrNone)
<a name="l00545"></a>00545 {
<a name="l00546"></a>00546 <span class="comment">// normal stream closure</span>
<a name="l00547"></a>00547 }
<a name="l00548"></a>00548 <span class="keywordflow">else</span>
<a name="l00549"></a>00549 {
<a name="l00550"></a>00550 <span class="comment">// completed with error(s)</span>
<a name="l00551"></a>00551 }
<a name="l00552"></a>00552 }
<a name="l00553"></a>00553
<a name="l00554"></a>00554
<a name="l00555"></a>00555 <span class="comment">// MMdaAudioOutputStream callbacks (MMdaAudioOutputStreamCallback)</span>
<a name="l00556"></a>00556
<a name="l00557"></a>00557 <span class="comment">// ----------------------------------------------------------------------------</span>
<a name="l00558"></a>00558 <span class="comment">// CAudioStreamEngine::MaoscOpenComplete(</span>
<a name="l00559"></a>00559 <span class="comment">// TInt aError)</span>
<a name="l00560"></a>00560 <span class="comment">//</span>
<a name="l00561"></a>00561 <span class="comment">// called upon completion of CMdaAudioOutputStream::Open(),</span>
<a name="l00562"></a>00562 <span class="comment">// if the stream was opened succesfully (aError==KErrNone), it's ready for use.</span>
<a name="l00563"></a>00563 <span class="comment">// upon succesful open, the first audio data block will be written to the </span>
<a name="l00564"></a>00564 <span class="comment">// output stream.</span>
<a name="l00565"></a>00565 <span class="comment">// ----------------------------------------------------------------------------</span>
<a name="l00566"></a>00566 <span class="keywordtype">void</span> CAudioStreamEngine::MaoscOpenComplete(TInt aError)
<a name="l00567"></a>00567 {
<a name="l00568"></a>00568 <span class="keywordflow">if</span> (aError==KErrNone)
<a name="l00569"></a>00569 {
<a name="l00570"></a>00570 <span class="comment">// output stream opened succesfully, set status</span>
<a name="l00571"></a>00571 iOutputStatus = EOpen;
<a name="l00572"></a>00572 <span class="comment">// Set the data type (encoding). Should not fail, since we already</span>
<a name="l00573"></a>00573 <span class="comment">// have tested support for this encoding in SetEncodingL with the </span>
<a name="l00574"></a>00574 <span class="comment">// corresponding input stream!</span>
<a name="l00575"></a>00575 TRAPD(error, iOutputStream->SetDataTypeL(iCurrentEncoding));
<a name="l00576"></a>00576 PanicIfError(error);
<a name="l00577"></a>00577
<a name="l00578"></a>00578 <span class="comment">// set volume to 1/4th of stream max volume</span>
<a name="l00579"></a>00579 iOutputStream->SetVolume(iOutputStream->MaxVolume()/2);
<a name="l00580"></a>00580 <span class="comment">// set stream priority to normal and time sensitive</span>
<a name="l00581"></a>00581 iOutputStream->SetPriority(EPriorityNormal,
<a name="l00582"></a>00582 EMdaPriorityPreferenceTime);
<a name="l00583"></a>00583 ShowMessage(_L(<span class="stringliteral">"Playing "</span>), ETrue);
<a name="l00584"></a>00584
<a name="l00585"></a>00585 <span class="keywordflow">if</span> (iUseAMR)
<a name="l00586"></a>00586 {
<a name="l00587"></a>00587 <span class="comment">// In case of AMR, the whole recorded/loaded buffer is played back at once, not frame by frame. </span>
<a name="l00588"></a>00588 <span class="comment">// The buffer might not be fully recorded, so we will only play back the part</span>
<a name="l00589"></a>00589 <span class="comment">// that is filled with data.</span>
<a name="l00590"></a>00590 iStreamIdx = iStreamEnd;
<a name="l00591"></a>00591 TRAPD(error2, iOutputStream->WriteL(GetPlaybackFrames(iStreamEnd)));
<a name="l00592"></a>00592 PanicIfError(error2);
<a name="l00593"></a>00593 }
<a name="l00594"></a>00594 <span class="keywordflow">else</span>
<a name="l00595"></a>00595 {
<a name="l00596"></a>00596 <span class="comment">// PCM needs to be played back frame by frame, otherwise some older devices might</span>
<a name="l00597"></a>00597 <span class="comment">// run into buffer overflow situations.</span>
<a name="l00598"></a>00598 iStreamIdx = 0;
<a name="l00599"></a>00599 TRAPD(error3, iOutputStream->WriteL(GetFrame(iStreamIdx)));
<a name="l00600"></a>00600 PanicIfError(error3);
<a name="l00601"></a>00601 }
<a name="l00602"></a>00602 }
<a name="l00603"></a>00603 <span class="keywordflow">else</span>
<a name="l00604"></a>00604 {
<a name="l00605"></a>00605 <span class="comment">// output stream open failed</span>
<a name="l00606"></a>00606 iOutputStatus = ENotReady;
<a name="l00607"></a>00607 ShowMessage(_L(<span class="stringliteral">"Playback failed!"</span>), ETrue);
<a name="l00608"></a>00608 }
<a name="l00609"></a>00609 }
<a name="l00610"></a>00610
<a name="l00611"></a>00611 <span class="comment">// ----------------------------------------------------------------------------</span>
<a name="l00612"></a>00612 <span class="comment">// CAudioStreamEngine::MaoscBufferCopied(</span>
<a name="l00613"></a>00613 <span class="comment">// TInt aError, const TDesC8& aBuffer)</span>
<a name="l00614"></a>00614 <span class="comment">//</span>
<a name="l00615"></a>00615 <span class="comment">// called when a block of audio data has been written to MMF. calls to WriteL() </span>
<a name="l00616"></a>00616 <span class="comment">// will be issued until all blocks in the audio data buffer (iStreamBuffer) are </span>
<a name="l00617"></a>00617 <span class="comment">// written.</span>
<a name="l00618"></a>00618 <span class="comment">// ----------------------------------------------------------------------------</span>
<a name="l00619"></a>00619 <span class="keywordtype">void</span> CAudioStreamEngine::MaoscBufferCopied(TInt aError, <span class="keyword">const</span> TDesC8& <span class="comment">/*aBuffer*/</span>)
<a name="l00620"></a>00620 {
<a name="l00621"></a>00621 <span class="keywordflow">if</span> (aError==KErrNone)
<a name="l00622"></a>00622 {
<a name="l00623"></a>00623 <span class="keywordflow">if</span> (iStreamIdx==iStreamEnd)
<a name="l00624"></a>00624 {
<a name="l00625"></a>00625 ShowMessage(_L(<span class="stringliteral">"\nPlayback complete!"</span>), EFalse);
<a name="l00626"></a>00626 <span class="comment">// Playback is complete:</span>
<a name="l00627"></a>00627 <span class="comment">// Start the active object that will stop the stream</span>
<a name="l00628"></a>00628 iStop->Start( TCallBack(BackgroundStop, <span class="keyword">this</span>) );
<a name="l00629"></a>00629 }
<a name="l00630"></a>00630 <span class="keywordflow">else</span>
<a name="l00631"></a>00631 {
<a name="l00632"></a>00632 iStreamIdx++;
<a name="l00633"></a>00633 TRAPD(error, iOutputStream->WriteL(GetFrame(iStreamIdx)));
<a name="l00634"></a>00634 PanicIfError(error);
<a name="l00635"></a>00635 }
<a name="l00636"></a>00636 }
<a name="l00637"></a>00637 <span class="keywordflow">else</span> <span class="keywordflow">if</span> (aError==KErrAbort)
<a name="l00638"></a>00638 {
<a name="l00639"></a>00639 <span class="comment">// Playing was aborted, due to call to CMdaAudioOutputStream::Stop().</span>
<a name="l00640"></a>00640 <span class="comment">// MaoscRecordComplete() will be called after exiting this method.</span>
<a name="l00641"></a>00641 iOutputStatus = ENotReady;
<a name="l00642"></a>00642 }
<a name="l00643"></a>00643 <span class="keywordflow">else</span>
<a name="l00644"></a>00644 {
<a name="l00645"></a>00645 ShowMessage(_L(<span class="stringliteral">"\nError writing data \nto output"</span>), EFalse);
<a name="l00646"></a>00646 iOutputStatus = ENotReady;
<a name="l00647"></a>00647 }
<a name="l00648"></a>00648 }
<a name="l00649"></a>00649
<a name="l00650"></a>00650
<a name="l00651"></a>00651 <span class="comment">// ----------------------------------------------------------------------------</span>
<a name="l00652"></a>00652 <span class="comment">// CAudioStreamEngine::MaoscPlayComplete(</span>
<a name="l00653"></a>00653 <span class="comment">// TInt aError)</span>
<a name="l00654"></a>00654 <span class="comment">//</span>
<a name="l00655"></a>00655 <span class="comment">// called when output stream is closed by CMdaAudioOutputStream::Stop() or if </span>
<a name="l00656"></a>00656 <span class="comment">// end of audio data has been reached, in this case KErrUnderflow will be </span>
<a name="l00657"></a>00657 <span class="comment">// returned.</span>
<a name="l00658"></a>00658 <span class="comment">// ----------------------------------------------------------------------------</span>
<a name="l00659"></a>00659 <span class="keywordtype">void</span> CAudioStreamEngine::MaoscPlayComplete(TInt aError)
<a name="l00660"></a>00660 {
<a name="l00661"></a>00661 iOutputStatus = ENotReady;
<a name="l00662"></a>00662 <span class="keywordflow">if</span> (aError==KErrNone)
<a name="l00663"></a>00663 {
<a name="l00664"></a>00664 <span class="comment">// normal stream closure</span>
<a name="l00665"></a>00665 }
<a name="l00666"></a>00666 <span class="keywordflow">else</span> <span class="keywordflow">if</span> (aError==KErrUnderflow)
<a name="l00667"></a>00667 {
<a name="l00668"></a>00668 <span class="comment">// end of audio data stream was reached because of stream underflow,</span>
<a name="l00669"></a>00669 }
<a name="l00670"></a>00670 <span class="keywordflow">else</span>
<a name="l00671"></a>00671 {
<a name="l00672"></a>00672 <span class="comment">// completed with error(s)</span>
<a name="l00673"></a>00673 }
<a name="l00674"></a>00674 }
<a name="l00675"></a>00675
<a name="l00676"></a>00676 <span class="comment">// END OF FILE</span>
<a name="l00677"></a>00677
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