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David Reid
354 lines
12 KiB
HTML
354 lines
12 KiB
HTML
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<body style="margin:0; padding:0">
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<div style="background-color:#003800; color:#bfa792;">
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<div style="max-width:100%; width:100%; margin:0 auto;">
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<table class="header-link-table" style="border-collapse:collapse; border-spacing:0; padding:0; padding-right:1em;">
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<table class="header-link-table" style="border-collapse:collapse; margin:0; padding:0">
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<tr>
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<td style="vertical-align:bottom; padding:0em; padding-right:2em;"><a href="../../index.html"><img src="../../img/logo1_large_white.png" style="height:24px; min-width:100%;"></a></td>
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<td><a href="../manual/index.html">Documentation</a></td>
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<td><a href="index.html">Examples</a></td>
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</tr>
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</table>
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</td>
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<td style="padding:0.1em; width:25%; text-align:right; vertical-align:center;">
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<a href="https://discord.gg/9vpqbjU"><img src="../../img/Discord-Logo-White.svg" style="margin:0; padding:0; height:32px; width:32px;"></a>
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</td>
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<td style="padding:0.1em; width:25%; text-align:right; vertical-align:center;">
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<a href="https://twitter.com/mackron"><img src="../../img/twitter_white.png" style="margin:0; padding:0; height:32px; width:32px;"></a>
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</td>
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<td style="padding:0.1em; padding-right:1em; width:25%; text-align:right; vertical-align:center;">
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<a href="https://github.com/dr-soft/miniaudio"><img src="../../img/github_white.png" style="margin:0; padding:0; height:24px; width:24px;"></a>
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</td>
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</tr>
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</table>
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</div>
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</div>
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<div style="background-color:#fff; padding-bottom:0em; border-top:solid 1px #003800; background-color:#eee;">
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<table border="0" style="margin:0 auto; width:100%; border-collapse:collapse; border:solid 0px #000;"><tr>
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<td valign="top" style="width:20em; padding:0; margin:0; border-right:solid 0px #000;"><div style="position:relative; height:100%; width:300px; border:solid 0px #000; padding:0; margin:0;">
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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 doc-navigation-active">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;">
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<h1>Simple Loopback</h1><p>
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Demonstrates how to implement loopback recording.
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</p>
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<p>
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This example simply captures data from your default playback device until you press Enter. The output is saved to the
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file specified on the command line.
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</p>
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<p>
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Loopback mode is when you record audio that is played from a given speaker. It is only supported on WASAPI, but can be
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used indirectly with PulseAudio by choosing the appropriate loopback device after enumeration.
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</p>
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<p>
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To use loopback mode you just need to set the device type to ma_device_type_loopback and set the capture device config
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properties. The output buffer in the callback will be null whereas the input buffer will be valid.</p>
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<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%">
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<span style="color:#666666">#define</span> MINIAUDIO_IMPLEMENTATION
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<span style="color:#666666">#include</span> <span style="color:#cc3300">"../miniaudio.h"</span>
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<span style="color:#666666">#include</span> <span style="color:#cc3300"><stdlib.h></span>
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<span style="color:#666666">#include</span> <span style="color:#cc3300"><stdio.h></span>
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<span style="color:#0033ff">void</span> data_callback(<span style="color:#0099cc">ma_device</span>* pDevice, <span style="color:#0033ff">void</span>* pOutput, <span style="color:#0033ff">const</span> <span style="color:#0033ff">void</span>* pInput, <span style="color:#0099cc">ma_uint32</span> frameCount)
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{
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<span style="color:#0099cc">ma_encoder</span>* pEncoder = (<span style="color:#0099cc">ma_encoder</span>*)pDevice->pUserData;
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MA_ASSERT(pEncoder != NULL);
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ma_encoder_write_pcm_frames(pEncoder, pInput, frameCount);
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(<span style="color:#0033ff">void</span>)pOutput;
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}
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<span style="color:#0033ff">int</span> main(<span style="color:#0033ff">int</span> argc, <span style="color:#0033ff">char</span>** argv)
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{
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<span style="color:#0099cc">ma_result</span> result;
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<span style="color:#0099cc">ma_encoder_config</span> encoderConfig;
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<span style="color:#0099cc">ma_encoder</span> encoder;
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<span style="color:#0099cc">ma_device_config</span> deviceConfig;
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<span style="color:#0099cc">ma_device</span> device;
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<span style="color:#009900">/* Loopback mode is currently only supported on WASAPI. */</span>
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ma_backend backends[] = {
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ma_backend_wasapi
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};
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<span style="color:#0033ff">if</span> (argc < 2) {
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printf(<span style="color:#cc3300">"No input file.\n"</span>);
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<span style="color:#0033ff">return</span> -1;
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}
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encoderConfig = ma_encoder_config_init(ma_resource_format_wav, ma_format_f32, 2, 44100);
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<span style="color:#0033ff">if</span> (ma_encoder_init_file(argv[1], &encoderConfig, &encoder) != MA_SUCCESS) {
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printf(<span style="color:#cc3300">"Failed to initialize output file.\n"</span>);
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<span style="color:#0033ff">return</span> -1;
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}
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deviceConfig = ma_device_config_init(ma_device_type_loopback);
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deviceConfig.capture.pDeviceID = NULL; <span style="color:#009900">/* Use default device for this example. Set this to the ID of a _playback_ device if you want to capture from a specific device. */</span>
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deviceConfig.capture.format = encoder.config.format;
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deviceConfig.capture.channels = encoder.config.channels;
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deviceConfig.sampleRate = encoder.config.sampleRate;
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deviceConfig.dataCallback = data_callback;
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deviceConfig.pUserData = &encoder;
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result = ma_device_init_ex(backends, <span style="color:#0033ff">sizeof</span>(backends)/<span style="color:#0033ff">sizeof</span>(backends[0]), NULL, &deviceConfig, &device);
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<span style="color:#0033ff">if</span> (result != MA_SUCCESS) {
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printf(<span style="color:#cc3300">"Failed to initialize loopback device.\n"</span>);
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<span style="color:#0033ff">return</span> -2;
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}
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result = ma_device_start(&device);
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<span style="color:#0033ff">if</span> (result != MA_SUCCESS) {
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ma_device_uninit(&device);
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printf(<span style="color:#cc3300">"Failed to start device.\n"</span>);
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<span style="color:#0033ff">return</span> -3;
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}
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printf(<span style="color:#cc3300">"Press Enter to stop recording...\n"</span>);
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getchar();
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ma_device_uninit(&device);
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ma_encoder_uninit(&encoder);
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<span style="color:#0033ff">return</span> 0;
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}
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</pre></div></td>
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</tr></table>
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</div>
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<table style="margin:0 auto; padding:1em 0px; text-align:center;">
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<tr>
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<td style="vertical-align:center;"><a style="padding:0;" href="https://discord.gg/9vpqbjU"><img src="../../img/Discord-Logo-White.svg" style="padding:0; height:32px; width:32px;"></a></td>
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<td style="vertical-align:center;"><a style="padding:0;" href="https://twitter.com/mackron"><img src="../../img/twitter_white.png" style="padding:0; height:32px; width:32px;"></a></td>
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<td style="vertical-align:center;"><a style="padding:0;" href="https://github.com/dr-soft/miniaudio"><img src="../../img/github_white.png" style="padding:0; height:24px; width:24px;"></a></td>
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</tr>
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</table>
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<div style="color:#e0d7cf; font-size:9pt; padding:2em 0px; text-align:center;">
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Copyright © 2020 David Reid<br/>
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Developed by David Reid - <a class="footer-link" href="mailto:davidreidsoftware@gmail.com">davidreidsoftware@gmail.com</a>
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