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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 doc-navigation-active">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 ">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 Capture</h1><p>
Demonstrates how to capture data from a microphone using the low-level API.
</p>
<p>
This example simply captures data from your default microphone until you press Enter. The output is saved to the file
specified on the command line.
</p>
<p>
Capturing works in a very similar way to playback. The only difference is the direction of data movement. Instead of
the application sending data to the device, the device will send data to the application. This example just writes the
data received by the microphone straight to a WAV file.</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;stdlib.h&gt;
#include &lt;stdio.h&gt;
void data_callback(ma_device* pDevice, void* pOutput, const void* pInput, ma_uint32 frameCount)
{
ma_encoder* pEncoder = (ma_encoder*)pDevice-&gt;pUserData;
MA_ASSERT(pEncoder != NULL);
ma_encoder_write_pcm_frames(pEncoder, pInput, frameCount);
(void)pOutput;
}
int main(int argc, char** argv)
{
ma_result result;
ma_encoder_config encoderConfig;
ma_encoder encoder;
ma_device_config deviceConfig;
ma_device device;
if (argc &lt; 2) {
printf(&quot;No input file.\n&quot;);
return -1;
}
encoderConfig = ma_encoder_config_init(ma_resource_format_wav, ma_format_f32, 2, 44100);
if (ma_encoder_init_file(argv[1], &amp;encoderConfig, &amp;encoder) != MA_SUCCESS) {
printf(&quot;Failed to initialize output file.\n&quot;);
return -1;
}
deviceConfig = ma_device_config_init(ma_device_type_capture);
deviceConfig.capture.format = encoder.config.format;
deviceConfig.capture.channels = encoder.config.channels;
deviceConfig.sampleRate = encoder.config.sampleRate;
deviceConfig.dataCallback = data_callback;
deviceConfig.pUserData = &amp;encoder;
result = ma_device_init(NULL, &amp;deviceConfig, &amp;device);
if (result != MA_SUCCESS) {
printf(&quot;Failed to initialize capture device.\n&quot;);
return -2;
}
result = ma_device_start(&amp;device);
if (result != MA_SUCCESS) {
ma_device_uninit(&amp;device);
printf(&quot;Failed to start device.\n&quot;);
return -3;
}
printf(&quot;Press Enter to stop recording...\n&quot;);
getchar();
ma_device_uninit(&amp;device);
ma_encoder_uninit(&amp;encoder);
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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