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<h1>AsyncAudioIO_demo.cpp</h1><p>An example of how to use the <a class="el" href="classAsync_1_1AudioIO.html" title="A class for handling audio input/output to an audio device.">Async::AudioIO</a> class</p>
<div class="fragment"><pre class="fragment"><span class="preprocessor">#include <iostream></span>
<span class="preprocessor">#include <<a class="code" href="AsyncCppApplication_8h.html" title="The core class for writing asyncronous cpp applications.">AsyncCppApplication.h</a>></span>
<span class="preprocessor">#include <<a class="code" href="AsyncAudioIO_8h.html" title="Contains a class for handling audio input/output to an audio device.">AsyncAudioIO.h</a>></span>
<span class="preprocessor">#include <<a class="code" href="AsyncAudioSink_8h.html" title="This file contains the base class for an audio sink.">AsyncAudioSink.h</a>></span>
<span class="preprocessor">#include <<a class="code" href="AsyncAudioSource_8h.html" title="This file contains the base class for an audio source.">AsyncAudioSource.h</a>></span>
<span class="keyword">using namespace </span>std;
<span class="keyword">using namespace </span>Async;
<span class="keyword">class </span>MyClass : <span class="keyword">public</span> Async::<a name="_a0"></a><a class="code" href="classAsync_1_1AudioSink.html" title="The base class for an audio sink.">AudioSink</a>, <span class="keyword">public</span> Async::<a name="_a1"></a><a class="code" href="classAsync_1_1AudioSource.html" title="The base class for an audio source.">AudioSource</a>
{
<span class="keyword">public</span>:
MyClass(<span class="keywordtype">void</span>)
{
<span class="comment">// Create a new audio IO object</span>
audio_io = <span class="keyword">new</span> <a name="_a2"></a><a class="code" href="classAsync_1_1AudioIO.html" title="A class for handling audio input/output to an audio device.">AudioIO</a>(<span class="stringliteral">"/dev/dsp"</span>, 0);
<span class="comment">// Open it for both reading and writing</span>
audio_io->open(AudioIO::MODE_RDWR);
<span class="comment">// Register this object as the audio source for sound output</span>
audio_io->registerSource(<span class="keyword">this</span>);
<span class="comment">// Register the audio device as the audio source for this object</span>
<a name="a3"></a><a class="code" href="classAsync_1_1AudioSink.html#a355c87f3f763af97de92f5b9ac4b6327" title="Register an audio source to provide samples to this sink.">registerSource</a>(audio_io);
}
~MyClass(<span class="keywordtype">void</span>)
{
<span class="keyword">delete</span> audio_io;
}
<span class="comment">// AudioSink functions</span>
<span class="keywordtype">int</span> <a name="a4"></a><a class="code" href="classAsync_1_1AudioSink.html#a490aa6380d6b0069fc501f0d9f62e236" title="Write samples into this audio sink.">writeSamples</a>(<span class="keyword">const</span> <span class="keywordtype">float</span> *samples, <span class="keywordtype">int</span> count)
{
<span class="comment">// Just loop incoming samples back to the audio device</span>
<span class="keywordflow">return</span> <a name="a5"></a><a class="code" href="classAsync_1_1AudioSource.html#ad23a249abf0f8fd39d364301364740a6">sinkWriteSamples</a>(samples, count);
}
<span class="keywordtype">void</span> <a name="a6"></a><a class="code" href="classAsync_1_1AudioSink.html#adde14468248671c6c5c85eb47234e0fa" title="Tell the sink to flush the previously written samples.">flushSamples</a>(<span class="keywordtype">void</span>)
{
<a name="a7"></a><a class="code" href="classAsync_1_1AudioSource.html#a5837ec95fef7d668d1c5241cee54646c">sinkFlushSamples</a>();
}
<span class="comment">// AudioSource functions</span>
<span class="keywordtype">void</span> <a name="a8"></a><a class="code" href="classAsync_1_1AudioSource.html#ac187f89a6094ec066dab5b4fd3108754" title="Resume audio output to the sink.">resumeOutput</a>(<span class="keywordtype">void</span>)
{
<a name="a9"></a><a class="code" href="classAsync_1_1AudioSink.html#a4c16d7b78aade12abc0b57ec1db95f62" title="Tell the source that we are ready to accept more samples.">sourceResumeOutput</a>();
}
<span class="keywordtype">void</span> <a name="a10"></a><a class="code" href="classAsync_1_1AudioSource.html#a563adf6411eddbd056abf206a12354b6" title="The registered sink has flushed all samples.">allSamplesFlushed</a>(<span class="keywordtype">void</span>)
{
<a name="a11"></a><a class="code" href="classAsync_1_1AudioSink.html#a2548622eb5c52ef80f3bd297f290be3c" title="Tell the source that all samples have been flushed.">sourceAllSamplesFlushed</a>();
}
<span class="keyword">private</span>:
<a class="code" href="classAsync_1_1AudioIO.html" title="A class for handling audio input/output to an audio device.">AudioIO</a> *audio_io;
};
<span class="keywordtype">int</span> main(<span class="keywordtype">int</span> argc, <span class="keywordtype">char</span> **argv)
{
<a name="_a12"></a><a class="code" href="classAsync_1_1CppApplication.html" title="An application class for writing non GUI applications.">CppApplication</a> app;
MyClass my_class;
app.<a name="a13"></a><a class="code" href="classAsync_1_1CppApplication.html#a9a921d33644bbb18767fb4d599f53bf4" title="Execute the application main loop.">exec</a>();
}
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