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<!DOCTYPE html>
<html>
<head>
<title>miniaudio - A single file audio playback and capture library.</title>
<meta name="description" content="miniaudio is a single file audio playback and capture library written in C.">
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<a href="../index.html" class="doc-navigation">Documentation Home</a><a href="../manual/index.html" class="doc-navigation">Programming Manual</a><a href="index.html" class="doc-navigation ">Examples</a><a href="fixed_size_callback.html" class="doc-navigation doc-navigation-l1 ">Fixed Size Callback</a><a href="simple_capture.html" class="doc-navigation doc-navigation-l1 ">Simple Capture</a><a href="simple_duplex.html" class="doc-navigation doc-navigation-l1 ">Simple Duplex</a><a href="simple_enumeration.html" class="doc-navigation doc-navigation-l1 ">Simple Enumeration</a><a href="simple_loopback.html" class="doc-navigation doc-navigation-l1 ">Simple Loopback</a><a href="simple_looping.html" class="doc-navigation doc-navigation-l1 doc-navigation-active">Simple Looping</a><a href="simple_mixing.html" class="doc-navigation doc-navigation-l1 ">Simple Mixing</a><a href="simple_playback.html" class="doc-navigation doc-navigation-l1 ">Simple Playback</a><a href="simple_playback_sine.html" class="doc-navigation doc-navigation-l1 ">Simple Playback Sine</a><a href="../api/index.html" class="doc-navigation" style="border-bottom:none;">API Reference</a></div></td><td valign="top" style="padding:1em; border-left:solid 1px #bbb;">
<h1>Simple Looping</h1><p>
Shows one way to handle looping of a sound.
</p>
<p>
This example uses a decoder as the data source. Decoders can be used with the <span style="font-family:monospace;">ma_data_source</span> API which, conveniently,
supports looping via the <span style="font-family:monospace;">ma_data_source_read_pcm_frames()</span> API. To use it, all you need to do is pass a pointer to the
decoder straight into <span style="font-family:monospace;">ma_data_source_read_pcm_frames()</span> and it will just work.</p>
<div style="font-family:monospace; border:solid 1px #003800; border-left:solid 0.5em #003800; margin:1em 0em;"><pre style="margin:0.5em 1em; padding:0; line-height:125%">
#define MINIAUDIO_IMPLEMENTATION
#include &quot;../miniaudio.h&quot;
#include &lt;stdio.h&gt;
void data_callback(ma_device* pDevice, void* pOutput, const void* pInput, ma_uint32 frameCount)
{
ma_bool32 isLooping = MA_TRUE;
ma_decoder* pDecoder = (ma_decoder*)pDevice-&gt;pUserData;
if (pDecoder == NULL) {
return;
}
/*
A decoder is a data source which means you can seemlessly plug it into the ma_data_source API. We can therefore take advantage
of the &quot;loop&quot; parameter of ma_data_source_read_pcm_frames() to handle looping for us.
*/
ma_data_source_read_pcm_frames(pDecoder, pOutput, frameCount, NULL, isLooping);
(void)pInput;
}
int main(int argc, char** argv)
{
ma_result result;
ma_decoder decoder;
ma_device_config deviceConfig;
ma_device device;
if (argc &lt; 2) {
printf(&quot;No input file.\n&quot;);
return -1;
}
result = ma_decoder_init_file(argv[1], NULL, &amp;decoder);
if (result != MA_SUCCESS) {
return -2;
}
deviceConfig = ma_device_config_init(ma_device_type_playback);
deviceConfig.playback.format = decoder.outputFormat;
deviceConfig.playback.channels = decoder.outputChannels;
deviceConfig.sampleRate = decoder.outputSampleRate;
deviceConfig.dataCallback = data_callback;
deviceConfig.pUserData = &amp;decoder;
if (ma_device_init(NULL, &amp;deviceConfig, &amp;device) != MA_SUCCESS) {
printf(&quot;Failed to open playback device.\n&quot;);
ma_decoder_uninit(&amp;decoder);
return -3;
}
if (ma_device_start(&amp;device) != MA_SUCCESS) {
printf(&quot;Failed to start playback device.\n&quot;);
ma_device_uninit(&amp;device);
ma_decoder_uninit(&amp;decoder);
return -4;
}
printf(&quot;Press Enter to quit...&quot;);
getchar();
ma_device_uninit(&amp;device);
ma_decoder_uninit(&amp;decoder);
return 0;
}
</pre></div></td>
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Copyright &copy; 2020 David Reid<br/>
Developed by David Reid - <a class="footer-link" href="mailto:davidreidsoftware@gmail.com">davidreidsoftware@gmail.com</a>
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