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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">  Version 2.0 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="keyword">typedef</font> snd_pcm_t *AUDIO_HANDLE;

  29. 00019   <font class="keyword">typedef</font> <font class="keywordtype">int</font> DEVICE_ID;

  30. 00020   <font class="keyword">typedef</font> pthread_t THREAD_HANDLE;

  31. 00021   <font class="keyword">typedef</font> pthread_mutex_t MUTEX;

  32. 00022 

  33. 00023 <font class="preprocessor">#elif defined(__LINUX_OSS_)</font>

  34. 00024 <font class="preprocessor"></font><font class="preprocessor">  #include &lt;pthread.h&gt;</font>

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

  36. 00026 

  37. 00027   <font class="keyword">typedef</font> <font class="keywordtype">int</font> AUDIO_HANDLE;

  38. 00028   <font class="keyword">typedef</font> <font class="keywordtype">int</font> DEVICE_ID;

  39. 00029   <font class="keyword">typedef</font> pthread_t THREAD_HANDLE;

  40. 00030   <font class="keyword">typedef</font> pthread_mutex_t MUTEX;

  41. 00031 

  42. 00032 <font class="preprocessor">#elif defined(__WINDOWS_DS_)</font>

  43. 00033 <font class="preprocessor"></font><font class="preprocessor">  #include &lt;windows.h&gt;</font>

  44. 00034 <font class="preprocessor">  #include &lt;process.h&gt;</font>

  45. 00035 

  46. 00036   <font class="comment">// The following struct is used to hold the extra variables</font>

  47. 00037   <font class="comment">// specific to the DirectSound implementation.</font>

  48. 00038   <font class="keyword">typedef</font> <font class="keyword">struct </font>{

  49. 00039     <font class="keywordtype">void</font> * object;

  50. 00040     <font class="keywordtype">void</font> * buffer;

  51. 00041     UINT bufferPointer;

  52. 00042   } AUDIO_HANDLE;

  53. 00043 

  54. 00044   <font class="keyword">typedef</font> LPGUID DEVICE_ID;

  55. 00045   <font class="keyword">typedef</font> <font class="keywordtype">unsigned</font> <font class="keywordtype">long</font> THREAD_HANDLE;

  56. 00046   <font class="keyword">typedef</font> CRITICAL_SECTION MUTEX;

  57. 00047 

  58. 00048 <font class="preprocessor">#elif defined(__IRIX_AL_)</font>

  59. 00049 <font class="preprocessor"></font><font class="preprocessor">  #include &lt;dmedia/audio.h&gt;</font>

  60. 00050 <font class="preprocessor">  #include &lt;pthread.h&gt;</font>

  61. 00051 <font class="preprocessor">  #include &lt;unistd.h&gt;</font>

  62. 00052 

  63. 00053   <font class="keyword">typedef</font> ALport AUDIO_HANDLE;

  64. 00054   <font class="keyword">typedef</font> <font class="keywordtype">int</font> DEVICE_ID;

  65. 00055   <font class="keyword">typedef</font> pthread_t THREAD_HANDLE;

  66. 00056   <font class="keyword">typedef</font> pthread_mutex_t MUTEX;

  67. 00057 

  68. 00058 <font class="preprocessor">#endif</font>

  69. 00059 <font class="preprocessor"></font>

  70. 00060 

  71. 00061 <font class="comment">// *************************************************** //</font>

  72. 00062 <font class="comment">//</font>

  73. 00063 <font class="comment">// RtAudioError class declaration.</font>

  74. 00064 <font class="comment">//</font>

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

  76. 00066 

  77. <a name="l00067"></a><a class="code" href="classRtAudioError.html">00067</a> <font class="keyword">class </font><a class="code" href="classRtAudioError.html">RtAudioError</a>

  78. 00068 {

  79. 00069 <font class="keyword">public</font>:

  80. <a name="l00070"></a><a class="code" href="classRtAudioError.html#s11">00070</a>   <font class="keyword">enum</font> TYPE {

  81. 00071     WARNING,

  82. 00072     DEBUG_WARNING,

  83. 00073     UNSPECIFIED,

  84. 00074     NO_DEVICES_FOUND,

  85. 00075     INVALID_DEVICE,

  86. 00076     INVALID_STREAM,

  87. 00077     MEMORY_ERROR,

  88. 00078     INVALID_PARAMETER,

  89. 00079     DRIVER_ERROR,

  90. 00080     SYSTEM_ERROR,

  91. 00081     THREAD_ERROR

  92. 00082   };

  93. 00083 

  94. 00084 <font class="keyword">protected</font>:

  95. <a name="l00085"></a><a class="code" href="classRtAudioError.html#n0">00085</a>   <font class="keywordtype">char</font> error_message[256];

  96. <a name="l00086"></a><a class="code" href="classRtAudioError.html#n1">00086</a>   TYPE type;

  97. 00087 

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

  99. 00090   <a class="code" href="classRtAudioError.html#a0">RtAudioError</a>(<font class="keyword">const</font> <font class="keywordtype">char</font> *p, TYPE tipe = RtAudioError::UNSPECIFIED);

  100. 00091 

  101. 00093   <font class="keyword">virtual</font> <a class="code" href="classRtAudioError.html#a1">~RtAudioError</a>(<font class="keywordtype">void</font>);

  102. 00094 

  103. 00096   <font class="keyword">virtual</font> <font class="keywordtype">void</font> <a class="code" href="classRtAudioError.html#a2">printMessage</a>(<font class="keywordtype">void</font>);

  104. 00097 

  105. <a name="l00099"></a><a class="code" href="classRtAudioError.html#a3">00099</a>   <font class="keyword">virtual</font> <font class="keyword">const</font> TYPE&amp; <a class="code" href="classRtAudioError.html#a3">getType</a>(<font class="keywordtype">void</font>)<font class="keyword"> </font>{ <font class="keywordflow">return</font> type; }

  106. 00100 

  107. <a name="l00102"></a><a class="code" href="classRtAudioError.html#a4">00102</a>   <font class="keyword">virtual</font> <font class="keyword">const</font> <font class="keywordtype">char</font> *<a class="code" href="classRtAudioError.html#a4">getMessage</a>(<font class="keywordtype">void</font>)<font class="keyword"> </font>{ <font class="keywordflow">return</font> error_message; }

  108. 00103 };

  109. 00104 

  110. 00105 

  111. 00106 <font class="comment">// *************************************************** //</font>

  112. 00107 <font class="comment">//</font>

  113. 00108 <font class="comment">// RtAudio class declaration.</font>

  114. 00109 <font class="comment">//</font>

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

  116. 00111 

  117. <a name="l00112"></a><a class="code" href="classRtAudio.html">00112</a> <font class="keyword">class </font><a class="code" href="classRtAudio.html">RtAudio</a>

  118. 00113 {

  119. 00114 <font class="keyword">public</font>:

  120. 00115 

  121. 00116   <font class="comment">// Support for signed integers and floats.  Audio data fed to/from</font>

  122. 00117   <font class="comment">// the tickStream() routine is assumed to ALWAYS be in host</font>

  123. 00118   <font class="comment">// byte order.  The internal routines will automatically take care of</font>

  124. 00119   <font class="comment">// any necessary byte-swapping between the host format and the</font>

  125. 00120   <font class="comment">// soundcard.  Thus, endian-ness is not a concern in the following</font>

  126. 00121   <font class="comment">// format definitions.</font>

  127. <a name="l00122"></a><a class="code" href="classRtAudio.html#s0">00122</a>   <font class="keyword">typedef</font> <font class="keywordtype">unsigned</font> <font class="keywordtype">long</font> RTAUDIO_FORMAT;

  128. <a name="l00123"></a><a class="code" href="classRtAudio.html#p0">00123</a>   <font class="keyword">static</font> <font class="keyword">const</font> RTAUDIO_FORMAT RTAUDIO_SINT8;

  129. <a name="l00124"></a><a class="code" href="classRtAudio.html#p1">00124</a>   <font class="keyword">static</font> <font class="keyword">const</font> RTAUDIO_FORMAT RTAUDIO_SINT16;

  130. <a name="l00125"></a><a class="code" href="classRtAudio.html#p2">00125</a>   <font class="keyword">static</font> <font class="keyword">const</font> RTAUDIO_FORMAT RTAUDIO_SINT24; 

  131. <a name="l00126"></a><a class="code" href="classRtAudio.html#p3">00126</a>   <font class="keyword">static</font> <font class="keyword">const</font> RTAUDIO_FORMAT RTAUDIO_SINT32;

  132. <a name="l00127"></a><a class="code" href="classRtAudio.html#p4">00127</a>   <font class="keyword">static</font> <font class="keyword">const</font> RTAUDIO_FORMAT RTAUDIO_FLOAT32; 

  133. <a name="l00128"></a><a class="code" href="classRtAudio.html#p5">00128</a>   <font class="keyword">static</font> <font class="keyword">const</font> RTAUDIO_FORMAT RTAUDIO_FLOAT64; 

  134. 00130   <font class="comment">//static const int MAX_SAMPLE_RATES = 14;</font>

  135. 00131   <font class="keyword">enum</font> { MAX_SAMPLE_RATES = 14 };

  136. 00132 

  137. 00133   <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);

  138. 00134 

  139. <a name="l00135"></a><a class="code" href="structRtAudio_1_1RTAUDIO__DEVICE.html">00135</a>   <font class="keyword">typedef</font> <font class="keyword">struct </font>{

  140. <a name="l00136"></a><a class="code" href="structRtAudio_1_1RTAUDIO__DEVICE.html#m0">00136</a>     <font class="keywordtype">char</font> name[128];

  141. <a name="l00137"></a><a class="code" href="structRtAudio_1_1RTAUDIO__DEVICE.html#m1">00137</a>     DEVICE_ID id[2];  

  142. <a name="l00138"></a><a class="code" href="structRtAudio_1_1RTAUDIO__DEVICE.html#m2">00138</a>     <font class="keywordtype">bool</font> probed;       

  143. <a name="l00139"></a><a class="code" href="structRtAudio_1_1RTAUDIO__DEVICE.html#m3">00139</a>     <font class="keywordtype">int</font> maxOutputChannels;

  144. <a name="l00140"></a><a class="code" href="structRtAudio_1_1RTAUDIO__DEVICE.html#m4">00140</a>     <font class="keywordtype">int</font> maxInputChannels;

  145. <a name="l00141"></a><a class="code" href="structRtAudio_1_1RTAUDIO__DEVICE.html#m5">00141</a>     <font class="keywordtype">int</font> maxDuplexChannels;

  146. <a name="l00142"></a><a class="code" href="structRtAudio_1_1RTAUDIO__DEVICE.html#m6">00142</a>     <font class="keywordtype">int</font> minOutputChannels;

  147. <a name="l00143"></a><a class="code" href="structRtAudio_1_1RTAUDIO__DEVICE.html#m7">00143</a>     <font class="keywordtype">int</font> minInputChannels;

  148. <a name="l00144"></a><a class="code" href="structRtAudio_1_1RTAUDIO__DEVICE.html#m8">00144</a>     <font class="keywordtype">int</font> minDuplexChannels;

  149. <a name="l00145"></a><a class="code" href="structRtAudio_1_1RTAUDIO__DEVICE.html#m9">00145</a>     <font class="keywordtype">bool</font> hasDuplexSupport; 

  150. <a name="l00146"></a><a class="code" href="structRtAudio_1_1RTAUDIO__DEVICE.html#m10">00146</a>     <font class="keywordtype">int</font> nSampleRates;      

  151. <a name="l00147"></a><a class="code" href="structRtAudio_1_1RTAUDIO__DEVICE.html#m11">00147</a>     <font class="keywordtype">int</font> sampleRates[MAX_SAMPLE_RATES]; 

  152. <a name="l00148"></a><a class="code" href="structRtAudio_1_1RTAUDIO__DEVICE.html#m12">00148</a>     RTAUDIO_FORMAT nativeFormats;     

  153. 00149   } RTAUDIO_DEVICE;

  154. 00150 

  155. 00152 

  156. 00159   <a class="code" href="classRtAudio.html#a0">RtAudio</a>();

  157. 00160 

  158. 00162 

  159. 00173   <a class="code" href="classRtAudio.html#a0">RtAudio</a>(<font class="keywordtype">int</font> *streamID,

  160. 00174           <font class="keywordtype">int</font> outputDevice, <font class="keywordtype">int</font> outputChannels,

  161. 00175           <font class="keywordtype">int</font> inputDevice, <font class="keywordtype">int</font> inputChannels,

  162. 00176           RTAUDIO_FORMAT format, <font class="keywordtype">int</font> sampleRate,

  163. 00177           <font class="keywordtype">int</font> *bufferSize, <font class="keywordtype">int</font> numberOfBuffers);

  164. 00178 

  165. 00180 

  166. 00184   <a class="code" href="classRtAudio.html#a2">~RtAudio</a>();

  167. 00185 

  168. 00187 

  169. 00214   <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,

  170. 00215                  <font class="keywordtype">int</font> inputDevice, <font class="keywordtype">int</font> inputChannels,

  171. 00216                  RTAUDIO_FORMAT format, <font class="keywordtype">int</font> sampleRate,

  172. 00217                  <font class="keywordtype">int</font> *bufferSize, <font class="keywordtype">int</font> numberOfBuffers);

  173. 00218 

  174. 00220 

  175. 00239   <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);

  176. 00240 

  177. 00242 

  178. 00249   <font class="keywordtype">void</font> <a class="code" href="classRtAudio.html#a5">cancelStreamCallback</a>(<font class="keywordtype">int</font> streamID);

  179. 00250 

  180. 00252   <font class="keywordtype">int</font> <a class="code" href="classRtAudio.html#a6">getDeviceCount</a>(<font class="keywordtype">void</font>);

  181. 00253 

  182. 00255 

  183. 00265   <font class="keywordtype">void</font> <a class="code" href="classRtAudio.html#a7">getDeviceInfo</a>(<font class="keywordtype">int</font> device, RTAUDIO_DEVICE *info);

  184. 00266 

  185. 00268 

  186. 00273   <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);

  187. 00274 

  188. 00276 

  189. 00281   <font class="keywordtype">void</font> <a class="code" href="classRtAudio.html#a9">tickStream</a>(<font class="keywordtype">int</font> streamID);

  190. 00282 

  191. 00284 

  192. 00288   <font class="keywordtype">void</font> <a class="code" href="classRtAudio.html#a10">closeStream</a>(<font class="keywordtype">int</font> streamID);

  193. 00289 

  194. 00291 

  195. 00295   <font class="keywordtype">void</font> <a class="code" href="classRtAudio.html#a11">startStream</a>(<font class="keywordtype">int</font> streamID);

  196. 00296 

  197. 00298 

  198. 00302   <font class="keywordtype">void</font> <a class="code" href="classRtAudio.html#a12">stopStream</a>(<font class="keywordtype">int</font> streamID);

  199. 00303 

  200. 00305 

  201. 00309   <font class="keywordtype">void</font> <a class="code" href="classRtAudio.html#a13">abortStream</a>(<font class="keywordtype">int</font> streamID);

  202. 00310 

  203. 00312 

  204. 00317   <font class="keywordtype">int</font> <a class="code" href="classRtAudio.html#a14">streamWillBlock</a>(<font class="keywordtype">int</font> streamID);

  205. 00318 

  206. 00319 <font class="keyword">protected</font>:

  207. 00320 

  208. 00321 <font class="keyword">private</font>:

  209. 00322 

  210. 00323   <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];

  211. 00324 

  212. 00325   <font class="keyword">enum</font> { FAILURE, SUCCESS };

  213. 00326 

  214. 00327   <font class="keyword">enum</font> STREAM_MODE {

  215. 00328     PLAYBACK,

  216. 00329     RECORD,

  217. 00330     DUPLEX,

  218. 00331     UNINITIALIZED = -75

  219. 00332   };

  220. 00333 

  221. 00334   <font class="keyword">enum</font> STREAM_STATE {

  222. 00335     STREAM_STOPPED,

  223. 00336     STREAM_RUNNING

  224. 00337   };

  225. 00338 

  226. 00339   <font class="keyword">typedef</font> <font class="keyword">struct </font>{

  227. 00340     <font class="keywordtype">int</font> device[2];           <font class="comment">// Playback and record, respectively.</font>

  228. 00341     STREAM_MODE mode;       <font class="comment">// PLAYBACK, RECORD, or DUPLEX.</font>

  229. 00342     AUDIO_HANDLE handle[2]; <font class="comment">// Playback and record handles, respectively.</font>

  230. 00343     STREAM_STATE state;     <font class="comment">// STOPPED or RUNNING</font>

  231. 00344     <font class="keywordtype">char</font> *userBuffer;

  232. 00345     <font class="keywordtype">char</font> *deviceBuffer;

  233. 00346     <font class="keywordtype">bool</font> doConvertBuffer[2]; <font class="comment">// Playback and record, respectively.</font>

  234. 00347     <font class="keywordtype">bool</font> deInterleave[2];    <font class="comment">// Playback and record, respectively.</font>

  235. 00348     <font class="keywordtype">bool</font> doByteSwap[2];      <font class="comment">// Playback and record, respectively.</font>

  236. 00349     <font class="keywordtype">int</font> sampleRate;

  237. 00350     <font class="keywordtype">int</font> bufferSize;

  238. 00351     <font class="keywordtype">int</font> nBuffers;

  239. 00352     <font class="keywordtype">int</font> nUserChannels[2];    <font class="comment">// Playback and record, respectively.</font>

  240. 00353     <font class="keywordtype">int</font> nDeviceChannels[2];  <font class="comment">// Playback and record channels, respectively.</font>

  241. 00354     RTAUDIO_FORMAT userFormat;

  242. 00355     RTAUDIO_FORMAT deviceFormat[2]; <font class="comment">// Playback and record, respectively.</font>

  243. 00356     <font class="keywordtype">bool</font> usingCallback;

  244. 00357     THREAD_HANDLE thread;

  245. 00358     MUTEX mutex;

  246. 00359     RTAUDIO_CALLBACK callback;

  247. 00360     <font class="keywordtype">void</font> *userData;

  248. 00361   } RTAUDIO_STREAM;

  249. 00362 

  250. 00363   <font class="keyword">typedef</font> <font class="keywordtype">signed</font> <font class="keywordtype">short</font> INT16;

  251. 00364   <font class="keyword">typedef</font> <font class="keywordtype">signed</font> <font class="keywordtype">int</font> INT32;

  252. 00365   <font class="keyword">typedef</font> <font class="keywordtype">float</font> FLOAT32;

  253. 00366   <font class="keyword">typedef</font> <font class="keywordtype">double</font> FLOAT64;

  254. 00367 

  255. 00368   <font class="keywordtype">char</font> message[256];

  256. 00369   <font class="keywordtype">int</font> nDevices;

  257. 00370   RTAUDIO_DEVICE *devices;

  258. 00371 

  259. 00372   std::map&lt;int, void *&gt; streams;

  260. 00373 

  261. 00375   <font class="keywordtype">void</font> error(RtAudioError::TYPE type);

  262. 00376 

  263. 00381   <font class="keywordtype">void</font> initialize(<font class="keywordtype">void</font>);

  264. 00382 

  265. 00384   <font class="keywordtype">void</font> clearDeviceInfo(RTAUDIO_DEVICE *info);

  266. 00385 

  267. 00393   <font class="keywordtype">void</font> probeDeviceInfo(RTAUDIO_DEVICE *info);

  268. 00394 

  269. 00401   <font class="keywordtype">bool</font> probeDeviceOpen(<font class="keywordtype">int</font> device, RTAUDIO_STREAM *stream,

  270. 00402                        STREAM_MODE mode, <font class="keywordtype">int</font> channels, 

  271. 00403                        <font class="keywordtype">int</font> sampleRate, RTAUDIO_FORMAT format,

  272. 00404                        <font class="keywordtype">int</font> *bufferSize, <font class="keywordtype">int</font> numberOfBuffers);

  273. 00405 

  274. 00412   <font class="keywordtype">void</font> *verifyStream(<font class="keywordtype">int</font> streamID);

  275. 00413 

  276. 00418   <font class="keywordtype">void</font> convertStreamBuffer(RTAUDIO_STREAM *stream, STREAM_MODE mode);

  277. 00419 

  278. 00421   <font class="keywordtype">void</font> byteSwapBuffer(<font class="keywordtype">char</font> *buffer, <font class="keywordtype">int</font> samples, RTAUDIO_FORMAT format);

  279. 00422 

  280. 00424   <font class="keywordtype">int</font> formatBytes(RTAUDIO_FORMAT format);

  281. 00425 };

  282. 00426 

  283. 00427 <font class="comment">// Uncomment the following definition to have extra information spewed to stderr.</font>

  284. 00428 <font class="comment">//#define RTAUDIO_DEBUG</font>

  285. 00429 

  286. 00430 <font class="preprocessor">#endif</font>

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

  288. 

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

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

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

  292. </table>

  293. 

  294. </BODY>

  295. </HTML>