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David Reid
364 lines
13 KiB
HTML
364 lines
13 KiB
HTML
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<body style="margin:0; padding:0">
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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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<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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</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/mackron/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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</table>
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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; table-layout:fixed;"><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:100%; 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="custom_backend.html" class="doc-navigation doc-navigation-l1 ">Custom Backend</a><a href="custom_decoder.html" class="doc-navigation doc-navigation-l1 ">Custom Decoder</a><a href="data_source_chaining.html" class="doc-navigation doc-navigation-l1 ">Data Source Chaining</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 ">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 doc-navigation-active">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 Playback Sine</h1><p>
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Demonstrates playback of a sine wave.
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</p>
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<p>
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Since all this example is doing is playing back a sine wave, we can disable decoding (and encoding) which will slightly
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reduce the size of the executable. This is done with the <span style="font-family:monospace;">MA_NO_DECODING</span> and <span style="font-family:monospace;">MA_NO_ENCODING</span> options.
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</p>
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<p>
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The generation of sine wave is achieved via the <span style="font-family:monospace;">ma_waveform</span> API. A waveform is a data source which means it can be
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seamlessly plugged into the <span style="font-family:monospace;">ma_data_source_*()</span> family of APIs as well.
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</p>
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<p>
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A waveform is initialized using the standard config/init pattern used throughout all of miniaudio. Frames are read via
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the <span style="font-family:monospace;">ma_waveform_read_pcm_frames()</span> API.
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</p>
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<p>
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This example works with Emscripten.</p>
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<div style="font-family:monospace; border:solid 1px #003800; border-left:solid 0.5em #003800; margin:1em 0em; width:100%;"><pre style="margin:0.5em 1em; padding:0; line-height:125%; overflow-x:auto;">
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<span style="color:#666666">#define</span> MA_NO_DECODING
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<span style="color:#666666">#define</span> MA_NO_ENCODING
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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"><stdio.h></span>
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<span style="color:#666666">#ifdef</span> __EMSCRIPTEN__
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<span style="color:#666666">#include</span> <span style="color:#cc3300"><emscripten.h></span>
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<span style="color:#0033ff">void</span> main_loop__em()
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{
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}
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<span style="color:#666666">#endif</span>
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<span style="color:#666666">#define</span> DEVICE_FORMAT ma_format_f32
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<span style="color:#666666">#define</span> DEVICE_CHANNELS 2
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<span style="color:#666666">#define</span> DEVICE_SAMPLE_RATE 48000
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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_waveform</span>* pSineWave;
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MA_ASSERT(pDevice->playback.channels == DEVICE_CHANNELS);
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pSineWave = (<span style="color:#0099cc">ma_waveform</span>*)pDevice->pUserData;
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MA_ASSERT(pSineWave != NULL);
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ma_waveform_read_pcm_frames(pSineWave, pOutput, frameCount);
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(<span style="color:#0033ff">void</span>)pInput; <span style="color:#009900">/* Unused. */</span>
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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_waveform</span> sineWave;
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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:#0099cc">ma_waveform_config</span> sineWaveConfig;
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sineWaveConfig = ma_waveform_config_init(DEVICE_FORMAT, DEVICE_CHANNELS, DEVICE_SAMPLE_RATE, ma_waveform_type_sine, 0.2, 220);
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ma_waveform_init(&sineWaveConfig, &sineWave);
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deviceConfig = ma_device_config_init(ma_device_type_playback);
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deviceConfig.playback.format = DEVICE_FORMAT;
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deviceConfig.playback.channels = DEVICE_CHANNELS;
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deviceConfig.sampleRate = DEVICE_SAMPLE_RATE;
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deviceConfig.dataCallback = data_callback;
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deviceConfig.pUserData = &sineWave;
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<span style="color:#0033ff">if</span> (ma_device_init(NULL, &deviceConfig, &device) != MA_SUCCESS) {
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printf(<span style="color:#cc3300">"Failed to open playback device.\n"</span>);
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<span style="color:#0033ff">return</span> -4;
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}
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printf(<span style="color:#cc3300">"Device Name: %s\n"</span>, device.playback.name);
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<span style="color:#0033ff">if</span> (ma_device_start(&device) != MA_SUCCESS) {
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printf(<span style="color:#cc3300">"Failed to start playback device.\n"</span>);
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ma_device_uninit(&device);
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<span style="color:#0033ff">return</span> -5;
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}
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<span style="color:#666666">#ifdef</span> __EMSCRIPTEN__
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emscripten_set_main_loop(main_loop__em, 0, 1);
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<span style="color:#666666">#else</span>
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printf(<span style="color:#cc3300">"Press Enter to quit...\n"</span>);
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getchar();
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<span style="color:#666666">#endif</span>
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ma_device_uninit(&device);
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(<span style="color:#0033ff">void</span>)argc;
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(<span style="color:#0033ff">void</span>)argv;
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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/mackron/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 © 2021 David Reid<br/>
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Developed by David Reid - <a class="footer-link" href="mailto:mackron@gmail.com">mackron@gmail.com</a>
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