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  1. <HTML>

  2. <HEAD>

  3. <TITLE>The RtAudio Tutorial</TITLE>

  4. <LINK HREF="doxygen.css" REL="stylesheet" TYPE="text/css">

  5. </HEAD>

  6. <BODY BGCOLOR="#FFFFFF">

  7. <CENTER>

  8. <a class="qindex" href="index.html">Tutorial</a> &nbsp; <a class="qindex" href="annotated.html">Class/Enum List</a> &nbsp; <a class="qindex" href="files.html">File List</a> &nbsp; <a class="qindex" href="functions.html">Compound Members</a> &nbsp; </CENTER>

  9. <HR>

  10. <!-- Generated by Doxygen 1.2.8.1 -->

  11. <h1>RtAudio.h</h1><a href="RtAudio_8h.html">Go to the documentation of this file.</a><div class="fragment"><pre>00001 <font class="comment">/******************************************/</font>

  12. 00002 <font class="comment">/*</font>

  13. 00003 <font class="comment">  RtAudio - realtime sound I/O C++ class</font>

  14. 00004 <font class="comment">  by Gary P. Scavone, 2001-2002.</font>

  15. 00005 <font class="comment">*/</font>

  16. 00006 <font class="comment">/******************************************/</font>

  17. 00007 

  18. 00008 <font class="preprocessor">#if !defined(__RTAUDIO_H)</font>

  19. <a name="l00009"></a><a class="code" href="RtAudio_8h.html#a0">00009</a> <font class="preprocessor"></font><font class="preprocessor">#define __RTAUDIO_H</font>

  20. 00010 <font class="preprocessor"></font>

  21. 00011 <font class="preprocessor">#include &lt;map&gt;</font>

  22. 00012 

  23. 00013 <font class="preprocessor">#if defined(__LINUX_ALSA__)</font>

  24. 00014 <font class="preprocessor"></font><font class="preprocessor">  #include &lt;alsa/asoundlib.h&gt;</font>

  25. 00015 <font class="preprocessor">  #include &lt;pthread.h&gt;</font>

  26. 00016 <font class="preprocessor">  #include &lt;unistd.h&gt;</font>

  27. 00017 

  28. 00018 <font class="preprocessor">  #define THREAD_TYPE</font>

  29. 00019 <font class="preprocessor"></font>  <font class="keyword">typedef</font> snd_pcm_t *AUDIO_HANDLE;

  30. 00020   <font class="keyword">typedef</font> <font class="keywordtype">int</font> DEVICE_ID;

  31. 00021   <font class="keyword">typedef</font> pthread_t THREAD_HANDLE;

  32. 00022   <font class="keyword">typedef</font> pthread_mutex_t MUTEX;

  33. 00023 

  34. 00024 <font class="preprocessor">#elif defined(__LINUX_OSS__)</font>

  35. 00025 <font class="preprocessor"></font><font class="preprocessor">  #include &lt;pthread.h&gt;</font>

  36. 00026 <font class="preprocessor">  #include &lt;unistd.h&gt;</font>

  37. 00027 

  38. 00028 <font class="preprocessor">  #define THREAD_TYPE</font>

  39. 00029 <font class="preprocessor"></font>  <font class="keyword">typedef</font> <font class="keywordtype">int</font> AUDIO_HANDLE;

  40. 00030   <font class="keyword">typedef</font> <font class="keywordtype">int</font> DEVICE_ID;

  41. 00031   <font class="keyword">typedef</font> pthread_t THREAD_HANDLE;

  42. 00032   <font class="keyword">typedef</font> pthread_mutex_t MUTEX;

  43. 00033 

  44. 00034 <font class="preprocessor">#elif defined(__WINDOWS_DS__)</font>

  45. 00035 <font class="preprocessor"></font><font class="preprocessor">  #include &lt;windows.h&gt;</font>

  46. 00036 <font class="preprocessor">  #include &lt;process.h&gt;</font>

  47. 00037 

  48. 00038   <font class="comment">// The following struct is used to hold the extra variables</font>

  49. 00039   <font class="comment">// specific to the DirectSound implementation.</font>

  50. 00040   <font class="keyword">typedef</font> <font class="keyword">struct </font>{

  51. 00041     <font class="keywordtype">void</font> * object;

  52. 00042     <font class="keywordtype">void</font> * buffer;

  53. 00043     UINT bufferPointer;

  54. 00044   } AUDIO_HANDLE;

  55. 00045 

  56. 00046 <font class="preprocessor">  #define THREAD_TYPE __stdcall</font>

  57. 00047 <font class="preprocessor"></font>  <font class="keyword">typedef</font> LPGUID DEVICE_ID;

  58. 00048   <font class="keyword">typedef</font> <font class="keywordtype">unsigned</font> <font class="keywordtype">long</font> THREAD_HANDLE;

  59. 00049   <font class="keyword">typedef</font> CRITICAL_SECTION MUTEX;

  60. 00050 

  61. 00051 <font class="preprocessor">#elif defined(__IRIX_AL__)</font>

  62. 00052 <font class="preprocessor"></font><font class="preprocessor">  #include &lt;dmedia/audio.h&gt;</font>

  63. 00053 <font class="preprocessor">  #include &lt;pthread.h&gt;</font>

  64. 00054 <font class="preprocessor">  #include &lt;unistd.h&gt;</font>

  65. 00055 

  66. 00056 <font class="preprocessor">  #define THREAD_TYPE</font>

  67. 00057 <font class="preprocessor"></font>  <font class="keyword">typedef</font> ALport AUDIO_HANDLE;

  68. 00058   <font class="keyword">typedef</font> <font class="keywordtype">int</font> DEVICE_ID;

  69. 00059   <font class="keyword">typedef</font> pthread_t THREAD_HANDLE;

  70. 00060   <font class="keyword">typedef</font> pthread_mutex_t MUTEX;

  71. 00061 

  72. 00062 <font class="preprocessor">#endif</font>

  73. 00063 <font class="preprocessor"></font>

  74. 00064 

  75. 00065 <font class="comment">// *************************************************** //</font>

  76. 00066 <font class="comment">//</font>

  77. 00067 <font class="comment">// RtError class declaration.</font>

  78. 00068 <font class="comment">//</font>

  79. 00069 <font class="comment">// *************************************************** //</font>

  80. 00070 

  81. <a name="l00071"></a><a class="code" href="classRtError.html">00071</a> <font class="keyword">class </font><a class="code" href="classRtError.html">RtError</a>

  82. 00072 {

  83. 00073 <font class="keyword">public</font>:

  84. <a name="l00074"></a><a class="code" href="classRtError.html#s11">00074</a>   <font class="keyword">enum</font> TYPE {

  85. 00075     WARNING,

  86. 00076     DEBUG_WARNING,

  87. 00077     UNSPECIFIED,

  88. 00078     NO_DEVICES_FOUND,

  89. 00079     INVALID_DEVICE,

  90. 00080     INVALID_STREAM,

  91. 00081     MEMORY_ERROR,

  92. 00082     INVALID_PARAMETER,

  93. 00083     DRIVER_ERROR,

  94. 00084     SYSTEM_ERROR,

  95. 00085     THREAD_ERROR

  96. 00086   };

  97. 00087 

  98. 00088 <font class="keyword">protected</font>:

  99. <a name="l00089"></a><a class="code" href="classRtError.html#n0">00089</a>   <font class="keywordtype">char</font> error_message[256];

  100. <a name="l00090"></a><a class="code" href="classRtError.html#n1">00090</a>   TYPE type;

  101. 00091 

  102. 00092 <font class="keyword">public</font>:

  103. 00094   <a class="code" href="classRtError.html#a0">RtError</a>(<font class="keyword">const</font> <font class="keywordtype">char</font> *p, TYPE tipe = RtError::UNSPECIFIED);

  104. 00095 

  105. 00097   <font class="keyword">virtual</font> <a class="code" href="classRtError.html#a1">~RtError</a>(<font class="keywordtype">void</font>);

  106. 00098 

  107. 00100   <font class="keyword">virtual</font> <font class="keywordtype">void</font> <a class="code" href="classRtError.html#a2">printMessage</a>(<font class="keywordtype">void</font>);

  108. 00101 

  109. <a name="l00103"></a><a class="code" href="classRtError.html#a3">00103</a>   <font class="keyword">virtual</font> <font class="keyword">const</font> TYPE&amp; <a class="code" href="classRtError.html#a3">getType</a>(<font class="keywordtype">void</font>)<font class="keyword"> </font>{ <font class="keywordflow">return</font> type; }

  110. 00104 

  111. <a name="l00106"></a><a class="code" href="classRtError.html#a4">00106</a>   <font class="keyword">virtual</font> <font class="keyword">const</font> <font class="keywordtype">char</font> *<a class="code" href="classRtError.html#a4">getMessage</a>(<font class="keywordtype">void</font>)<font class="keyword"> </font>{ <font class="keywordflow">return</font> error_message; }

  112. 00107 };

  113. 00108 

  114. 00109 

  115. 00110 <font class="comment">// *************************************************** //</font>

  116. 00111 <font class="comment">//</font>

  117. 00112 <font class="comment">// RtAudio class declaration.</font>

  118. 00113 <font class="comment">//</font>

  119. 00114 <font class="comment">// *************************************************** //</font>

  120. 00115 

  121. <a name="l00116"></a><a class="code" href="classRtAudio.html">00116</a> <font class="keyword">class </font><a class="code" href="classRtAudio.html">RtAudio</a>

  122. 00117 {

  123. 00118 <font class="keyword">public</font>:

  124. 00119 

  125. 00120   <font class="comment">// Support for signed integers and floats.  Audio data fed to/from</font>

  126. 00121   <font class="comment">// the tickStream() routine is assumed to ALWAYS be in host</font>

  127. 00122   <font class="comment">// byte order.  The internal routines will automatically take care of</font>

  128. 00123   <font class="comment">// any necessary byte-swapping between the host format and the</font>

  129. 00124   <font class="comment">// soundcard.  Thus, endian-ness is not a concern in the following</font>

  130. 00125   <font class="comment">// format definitions.</font>

  131. <a name="l00126"></a><a class="code" href="classRtAudio.html#s0">00126</a>   <font class="keyword">typedef</font> <font class="keywordtype">unsigned</font> <font class="keywordtype">long</font> RTAUDIO_FORMAT;

  132. <a name="l00127"></a><a class="code" href="classRtAudio.html#p0">00127</a>   <font class="keyword">static</font> <font class="keyword">const</font> RTAUDIO_FORMAT RTAUDIO_SINT8;

  133. <a name="l00128"></a><a class="code" href="classRtAudio.html#p1">00128</a>   <font class="keyword">static</font> <font class="keyword">const</font> RTAUDIO_FORMAT RTAUDIO_SINT16;

  134. <a name="l00129"></a><a class="code" href="classRtAudio.html#p2">00129</a>   <font class="keyword">static</font> <font class="keyword">const</font> RTAUDIO_FORMAT RTAUDIO_SINT24; 

  135. <a name="l00130"></a><a class="code" href="classRtAudio.html#p3">00130</a>   <font class="keyword">static</font> <font class="keyword">const</font> RTAUDIO_FORMAT RTAUDIO_SINT32;

  136. <a name="l00131"></a><a class="code" href="classRtAudio.html#p4">00131</a>   <font class="keyword">static</font> <font class="keyword">const</font> RTAUDIO_FORMAT RTAUDIO_FLOAT32; 

  137. <a name="l00132"></a><a class="code" href="classRtAudio.html#p5">00132</a>   <font class="keyword">static</font> <font class="keyword">const</font> RTAUDIO_FORMAT RTAUDIO_FLOAT64; 

  138. 00133 

  139. 00134   <font class="comment">//static const int MAX_SAMPLE_RATES = 14;</font>

  140. 00135   <font class="keyword">enum</font> { MAX_SAMPLE_RATES = 14 };

  141. 00136 

  142. 00137   <font class="keyword">typedef</font> int (*RTAUDIO_CALLBACK)(<font class="keywordtype">char</font> *buffer, <font class="keywordtype">int</font> bufferSize, <font class="keywordtype">void</font> *userData);

  143. 00138 

  144. <a name="l00139"></a><a class="code" href="structRtAudio_1_1RTAUDIO__DEVICE.html">00139</a>   <font class="keyword">typedef</font> <font class="keyword">struct </font>{

  145. <a name="l00140"></a><a class="code" href="structRtAudio_1_1RTAUDIO__DEVICE.html#m0">00140</a>     <font class="keywordtype">char</font> name[128];

  146. <a name="l00141"></a><a class="code" href="structRtAudio_1_1RTAUDIO__DEVICE.html#m1">00141</a>     DEVICE_ID id[2];  

  147. <a name="l00142"></a><a class="code" href="structRtAudio_1_1RTAUDIO__DEVICE.html#m2">00142</a>     <font class="keywordtype">bool</font> probed;       

  148. <a name="l00143"></a><a class="code" href="structRtAudio_1_1RTAUDIO__DEVICE.html#m3">00143</a>     <font class="keywordtype">int</font> maxOutputChannels;

  149. <a name="l00144"></a><a class="code" href="structRtAudio_1_1RTAUDIO__DEVICE.html#m4">00144</a>     <font class="keywordtype">int</font> maxInputChannels;

  150. <a name="l00145"></a><a class="code" href="structRtAudio_1_1RTAUDIO__DEVICE.html#m5">00145</a>     <font class="keywordtype">int</font> maxDuplexChannels;

  151. <a name="l00146"></a><a class="code" href="structRtAudio_1_1RTAUDIO__DEVICE.html#m6">00146</a>     <font class="keywordtype">int</font> minOutputChannels;

  152. <a name="l00147"></a><a class="code" href="structRtAudio_1_1RTAUDIO__DEVICE.html#m7">00147</a>     <font class="keywordtype">int</font> minInputChannels;

  153. <a name="l00148"></a><a class="code" href="structRtAudio_1_1RTAUDIO__DEVICE.html#m8">00148</a>     <font class="keywordtype">int</font> minDuplexChannels;

  154. <a name="l00149"></a><a class="code" href="structRtAudio_1_1RTAUDIO__DEVICE.html#m9">00149</a>     <font class="keywordtype">bool</font> hasDuplexSupport; 

  155. <a name="l00150"></a><a class="code" href="structRtAudio_1_1RTAUDIO__DEVICE.html#m10">00150</a>     <font class="keywordtype">int</font> nSampleRates;      

  156. <a name="l00151"></a><a class="code" href="structRtAudio_1_1RTAUDIO__DEVICE.html#m11">00151</a>     <font class="keywordtype">int</font> sampleRates[MAX_SAMPLE_RATES]; 

  157. <a name="l00152"></a><a class="code" href="structRtAudio_1_1RTAUDIO__DEVICE.html#m12">00152</a>     RTAUDIO_FORMAT nativeFormats;     

  158. 00153   } RTAUDIO_DEVICE;

  159. 00154 

  160. 00156 

  161. 00163   <a class="code" href="classRtAudio.html#a0">RtAudio</a>();

  162. 00164 

  163. 00166 

  164. 00177   <a class="code" href="classRtAudio.html#a0">RtAudio</a>(<font class="keywordtype">int</font> *streamId,

  165. 00178           <font class="keywordtype">int</font> outputDevice, <font class="keywordtype">int</font> outputChannels,

  166. 00179           <font class="keywordtype">int</font> inputDevice, <font class="keywordtype">int</font> inputChannels,

  167. 00180           RTAUDIO_FORMAT format, <font class="keywordtype">int</font> sampleRate,

  168. 00181           <font class="keywordtype">int</font> *bufferSize, <font class="keywordtype">int</font> numberOfBuffers);

  169. 00182 

  170. 00184 

  171. 00188   <a class="code" href="classRtAudio.html#a2">~RtAudio</a>();

  172. 00189 

  173. 00191 

  174. 00218   <font class="keywordtype">int</font> <a class="code" href="classRtAudio.html#a3">openStream</a>(<font class="keywordtype">int</font> outputDevice, <font class="keywordtype">int</font> outputChannels,

  175. 00219                  <font class="keywordtype">int</font> inputDevice, <font class="keywordtype">int</font> inputChannels,

  176. 00220                  RTAUDIO_FORMAT format, <font class="keywordtype">int</font> sampleRate,

  177. 00221                  <font class="keywordtype">int</font> *bufferSize, <font class="keywordtype">int</font> numberOfBuffers);

  178. 00222 

  179. 00224 

  180. 00243   <font class="keywordtype">void</font> <a class="code" href="classRtAudio.html#a4">setStreamCallback</a>(<font class="keywordtype">int</font> streamId, RTAUDIO_CALLBACK callback, <font class="keywordtype">void</font> *userData);

  181. 00244 

  182. 00246 

  183. 00253   <font class="keywordtype">void</font> <a class="code" href="classRtAudio.html#a5">cancelStreamCallback</a>(<font class="keywordtype">int</font> streamId);

  184. 00254 

  185. 00256   <font class="keywordtype">int</font> <a class="code" href="classRtAudio.html#a6">getDeviceCount</a>(<font class="keywordtype">void</font>);

  186. 00257 

  187. 00259 

  188. 00269   <font class="keywordtype">void</font> <a class="code" href="classRtAudio.html#a7">getDeviceInfo</a>(<font class="keywordtype">int</font> device, RTAUDIO_DEVICE *info);

  189. 00270 

  190. 00272 

  191. 00277   <font class="keywordtype">char</font> * <font class="keyword">const</font> <a class="code" href="classRtAudio.html#a8">getStreamBuffer</a>(<font class="keywordtype">int</font> streamId);

  192. 00278 

  193. 00280 

  194. 00285   <font class="keywordtype">void</font> <a class="code" href="classRtAudio.html#a9">tickStream</a>(<font class="keywordtype">int</font> streamId);

  195. 00286 

  196. 00288 

  197. 00292   <font class="keywordtype">void</font> <a class="code" href="classRtAudio.html#a10">closeStream</a>(<font class="keywordtype">int</font> streamId);

  198. 00293 

  199. 00295 

  200. 00299   <font class="keywordtype">void</font> <a class="code" href="classRtAudio.html#a11">startStream</a>(<font class="keywordtype">int</font> streamId);

  201. 00300 

  202. 00302 

  203. 00306   <font class="keywordtype">void</font> <a class="code" href="classRtAudio.html#a12">stopStream</a>(<font class="keywordtype">int</font> streamId);

  204. 00307 

  205. 00309 

  206. 00313   <font class="keywordtype">void</font> <a class="code" href="classRtAudio.html#a13">abortStream</a>(<font class="keywordtype">int</font> streamId);

  207. 00314 

  208. 00316 

  209. 00321   <font class="keywordtype">int</font> <a class="code" href="classRtAudio.html#a14">streamWillBlock</a>(<font class="keywordtype">int</font> streamId);

  210. 00322 

  211. 00323 <font class="keyword">protected</font>:

  212. 00324 

  213. 00325 <font class="keyword">private</font>:

  214. 00326 

  215. 00327   <font class="keyword">static</font> <font class="keyword">const</font> <font class="keywordtype">unsigned</font> <font class="keywordtype">int</font> SAMPLE_RATES[MAX_SAMPLE_RATES];

  216. 00328 

  217. 00329   <font class="keyword">enum</font> { FAILURE, SUCCESS };

  218. 00330 

  219. 00331   <font class="keyword">enum</font> STREAM_MODE {

  220. 00332     PLAYBACK,

  221. 00333     RECORD,

  222. 00334     DUPLEX,

  223. 00335     UNINITIALIZED = -75

  224. 00336   };

  225. 00337 

  226. 00338   <font class="keyword">enum</font> STREAM_STATE {

  227. 00339     STREAM_STOPPED,

  228. 00340     STREAM_RUNNING

  229. 00341   };

  230. 00342 

  231. 00343   <font class="keyword">typedef</font> <font class="keyword">struct </font>{

  232. 00344     <font class="keywordtype">int</font> device[2];          <font class="comment">// Playback and record, respectively.</font>

  233. 00345     STREAM_MODE mode;       <font class="comment">// PLAYBACK, RECORD, or DUPLEX.</font>

  234. 00346     AUDIO_HANDLE handle[2]; <font class="comment">// Playback and record handles, respectively.</font>

  235. 00347     STREAM_STATE state;     <font class="comment">// STOPPED or RUNNING</font>

  236. 00348     <font class="keywordtype">char</font> *userBuffer;

  237. 00349     <font class="keywordtype">char</font> *deviceBuffer;

  238. 00350     <font class="keywordtype">bool</font> doConvertBuffer[2]; <font class="comment">// Playback and record, respectively.</font>

  239. 00351     <font class="keywordtype">bool</font> deInterleave[2];    <font class="comment">// Playback and record, respectively.</font>

  240. 00352     <font class="keywordtype">bool</font> doByteSwap[2];      <font class="comment">// Playback and record, respectively.</font>

  241. 00353     <font class="keywordtype">int</font> sampleRate;

  242. 00354     <font class="keywordtype">int</font> bufferSize;

  243. 00355     <font class="keywordtype">int</font> nBuffers;

  244. 00356     <font class="keywordtype">int</font> nUserChannels[2];    <font class="comment">// Playback and record, respectively.</font>

  245. 00357     <font class="keywordtype">int</font> nDeviceChannels[2];  <font class="comment">// Playback and record channels, respectively.</font>

  246. 00358     RTAUDIO_FORMAT userFormat;

  247. 00359     RTAUDIO_FORMAT deviceFormat[2]; <font class="comment">// Playback and record, respectively.</font>

  248. 00360     <font class="keywordtype">bool</font> usingCallback;

  249. 00361     THREAD_HANDLE thread;

  250. 00362     MUTEX mutex;

  251. 00363     RTAUDIO_CALLBACK callback;

  252. 00364     <font class="keywordtype">void</font> *userData;

  253. 00365   } RTAUDIO_STREAM;

  254. 00366 

  255. 00367   <font class="keyword">typedef</font> <font class="keywordtype">signed</font> <font class="keywordtype">short</font> INT16;

  256. 00368   <font class="keyword">typedef</font> <font class="keywordtype">signed</font> <font class="keywordtype">int</font> INT32;

  257. 00369   <font class="keyword">typedef</font> <font class="keywordtype">float</font> FLOAT32;

  258. 00370   <font class="keyword">typedef</font> <font class="keywordtype">double</font> FLOAT64;

  259. 00371 

  260. 00372   <font class="keywordtype">char</font> message[256];

  261. 00373   <font class="keywordtype">int</font> nDevices;

  262. 00374   RTAUDIO_DEVICE *devices;

  263. 00375 

  264. 00376   std::map&lt;int, void *&gt; streams;

  265. 00377 

  266. 00379   <font class="keywordtype">void</font> error(RtError::TYPE type);

  267. 00380 

  268. 00385   <font class="keywordtype">void</font> initialize(<font class="keywordtype">void</font>);

  269. 00386 

  270. 00388   <font class="keywordtype">void</font> clearDeviceInfo(RTAUDIO_DEVICE *info);

  271. 00389 

  272. 00397   <font class="keywordtype">void</font> probeDeviceInfo(RTAUDIO_DEVICE *info);

  273. 00398 

  274. 00405   <font class="keywordtype">bool</font> probeDeviceOpen(<font class="keywordtype">int</font> device, RTAUDIO_STREAM *stream,

  275. 00406                        STREAM_MODE mode, <font class="keywordtype">int</font> channels, 

  276. 00407                        <font class="keywordtype">int</font> sampleRate, RTAUDIO_FORMAT format,

  277. 00408                        <font class="keywordtype">int</font> *bufferSize, <font class="keywordtype">int</font> numberOfBuffers);

  278. 00409 

  279. 00416   <font class="keywordtype">void</font> *verifyStream(<font class="keywordtype">int</font> streamId);

  280. 00417 

  281. 00422   <font class="keywordtype">void</font> convertStreamBuffer(RTAUDIO_STREAM *stream, STREAM_MODE mode);

  282. 00423 

  283. 00425   <font class="keywordtype">void</font> byteSwapBuffer(<font class="keywordtype">char</font> *buffer, <font class="keywordtype">int</font> samples, RTAUDIO_FORMAT format);

  284. 00426 

  285. 00428   <font class="keywordtype">int</font> formatBytes(RTAUDIO_FORMAT format);

  286. 00429 };

  287. 00430 

  288. 00431 <font class="comment">// Uncomment the following definition to have extra information spewed to stderr.</font>

  289. 00432 <font class="comment">//#define RTAUDIO_DEBUG</font>

  290. 00433 

  291. 00434 <font class="preprocessor">#endif</font>

  292. </font></pre></div><HR>

  293. 

  294. <table><tr><td><img src="../images/ccrma.gif">

  295.   <td>&copy;2001-2002 CCRMA, Stanford University. All Rights Reserved.<br>

  296.   Maintained by Gary P. Scavone, <a href="mailto:gary@ccrma.stanford.edu">gary@ccrma.stanford.edu</a><P>

  297. </table>

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