mirror of
https://github.com/mackron/miniaudio.git
synced 2026-04-22 00:06:59 +02:00
David Reid
403 lines
16 KiB
HTML
403 lines
16 KiB
HTML
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<title>miniaudio - A single file audio playback and capture library.</title>
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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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<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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<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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<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="custom_decoder_engine.html" class="doc-navigation doc-navigation-l1 ">Custom Decoder Engine</a><a href="data_source_chaining.html" class="doc-navigation doc-navigation-l1 ">Data Source Chaining</a><a href="duplex_effect.html" class="doc-navigation doc-navigation-l1 ">Duplex Effect</a><a href="engine_advanced.html" class="doc-navigation doc-navigation-l1 ">Engine Advanced</a><a href="engine_effects.html" class="doc-navigation doc-navigation-l1 ">Engine Effects</a><a href="engine_hello_world.html" class="doc-navigation doc-navigation-l1 ">Engine Hello World</a><a href="engine_sdl.html" class="doc-navigation doc-navigation-l1 doc-navigation-active">Engine Sdl</a><a href="engine_steamaudio.html" class="doc-navigation doc-navigation-l1 ">Engine Steamaudio</a><a href="node_graph.html" class="doc-navigation doc-navigation-l1 ">Node Graph</a><a href="resource_manager.html" class="doc-navigation doc-navigation-l1 ">Resource Manager</a><a href="resource_manager_advanced.html" class="doc-navigation doc-navigation-l1 ">Resource Manager Advanced</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 ">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>Engine Sdl</h1><p>
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Shows how to use the high level engine API with SDL.
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</p>
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<p>
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By default, miniaudio's engine API will initialize a device internally for audio output. You can
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instead use the engine independently of a device. To show this off, this example will use SDL for
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audio output instead of miniaudio.
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</p>
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<p>
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This example will load the sound specified on the command line and rotate it around the listener's
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head.</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_DEVICE_IO <span style="color:#009900">/* <-- Disables the <span style="font-family:monospace;">ma_device</span> API. We don't need that in this example since SDL will be doing that part for us. */</span>
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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">#define</span> SDL_MAIN_HANDLED
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<span style="color:#666666">#include</span> <span style="color:#cc3300"><SDL.h></span> <span style="color:#009900">/* Change this to your include location. Might be <SDL2/SDL.h>. */</span>
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<span style="color:#666666">#define</span> CHANNELS 2 <span style="color:#009900">/* Must be stereo for this example. */</span>
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<span style="color:#666666">#define</span> SAMPLE_RATE 48000
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<span style="color:#0033ff">static</span> ma_engine g_engine;
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<span style="color:#0033ff">static</span> ma_sound g_sound; <span style="color:#009900">/* This example will play only a single sound at once, so we only need one <span style="font-family:monospace;">ma_sound</span> object. */</span>
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<span style="color:#0033ff">void</span> data_callback(<span style="color:#0033ff">void</span>* pUserData, <span style="color:#0099cc">ma_uint8</span>* pBuffer, <span style="color:#0033ff">int</span> bufferSizeInBytes)
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{
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<span style="color:#009900">/* Reading is just a matter of reading straight from the engine. */</span>
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<span style="color:#0099cc">ma_uint32</span> bufferSizeInFrames = (<span style="color:#0099cc">ma_uint32</span>)bufferSizeInBytes / ma_get_bytes_per_frame(ma_format_f32, ma_engine_get_channels(&g_engine));
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ma_engine_read_pcm_frames(&g_engine, pBuffer, bufferSizeInFrames, NULL);
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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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ma_engine_config engineConfig;
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SDL_AudioSpec desiredSpec;
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SDL_AudioSpec obtainedSpec;
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SDL_AudioDeviceID deviceID;
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<span style="color:#0033ff">if</span> (argc < 2) {
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printf(<span style="color:#cc3300">"No input file."</span>);
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<span style="color:#0033ff">return</span> -1;
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}
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<span style="color:#009900">/*
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We'll initialize the engine first for the purpose of the example, but since the engine and SDL
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are independent of each other you can initialize them in any order. You need only make sure the
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channel count and sample rates are consistent between the two.
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When initializing the engine it's important to make sure we don't initialize a device
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internally because we want SDL to be dealing with that for us instead.
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*/</span>
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engineConfig = ma_engine_config_init();
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engineConfig.noDevice = MA_TRUE; <span style="color:#009900">/* <-- Make sure this is set so that no device is created (we'll deal with that ourselves). */</span>
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engineConfig.channels = CHANNELS;
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engineConfig.sampleRate = SAMPLE_RATE;
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result = ma_engine_init(&engineConfig, &g_engine);
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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 audio engine."</span>);
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<span style="color:#0033ff">return</span> -1;
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}
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<span style="color:#009900">/* Now load our sound. */</span>
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result = ma_sound_init_from_file(&g_engine, argv[1], 0, NULL, NULL, &g_sound);
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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 sound."</span>);
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<span style="color:#0033ff">return</span> -1;
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}
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<span style="color:#009900">/* Loop the sound so we can continuously hear it. */</span>
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ma_sound_set_looping(&g_sound, MA_TRUE);
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<span style="color:#009900">/*
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The sound will not be started by default, so start it now. We won't hear anything until the SDL
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audio device has been opened and started.
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*/</span>
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ma_sound_start(&g_sound);
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<span style="color:#009900">/*
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Now that we have the engine and sound we can initialize SDL. This could have also been done
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first before the engine and sound.
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*/</span>
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<span style="color:#0033ff">if</span> (SDL_InitSubSystem(SDL_INIT_AUDIO) != 0) {
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printf(<span style="color:#cc3300">"Failed to initialize SDL sub-system."</span>);
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<span style="color:#0033ff">return</span> -1;
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}
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MA_ZERO_OBJECT(&desiredSpec);
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desiredSpec.freq = ma_engine_get_sample_rate(&g_engine);
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desiredSpec.format = AUDIO_F32;
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desiredSpec.channels = ma_engine_get_channels(&g_engine);
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desiredSpec.samples = 512;
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desiredSpec.callback = data_callback;
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desiredSpec.userdata = NULL;
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deviceID = SDL_OpenAudioDevice(NULL, 0, &desiredSpec, &obtainedSpec, SDL_AUDIO_ALLOW_ANY_CHANGE);
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<span style="color:#0033ff">if</span> (deviceID == 0) {
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printf(<span style="color:#cc3300">"Failed to open SDL audio device."</span>);
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<span style="color:#0033ff">return</span> -1;
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}
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<span style="color:#009900">/* Start playback. */</span>
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SDL_PauseAudioDevice(deviceID, 0);
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<span style="color:#666666">#if</span> 1
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{
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<span style="color:#009900">/* We'll move the sound around the listener which we'll leave at the origin. */</span>
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<span style="color:#0033ff">float</span> stepAngle = 0.002f;
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<span style="color:#0033ff">float</span> angle = 0;
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<span style="color:#0033ff">float</span> distance = 2;
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<span style="color:#0033ff">for</span> (;;) {
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<span style="color:#0033ff">double</span> x = ma_cosd(angle) - ma_sind(angle);
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<span style="color:#0033ff">double</span> y = ma_sind(angle) + ma_cosd(angle);
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ma_sound_set_position(&g_sound, (<span style="color:#0033ff">float</span>)x * distance, 0, (<span style="color:#0033ff">float</span>)y * distance);
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angle += stepAngle;
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ma_sleep(1);
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}
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}
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<span style="color:#666666">#else</span>
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printf(<span style="color:#cc3300">"Press Enter to quit..."</span>);
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getchar();
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<span style="color:#666666">#endif</span>
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ma_sound_uninit(&g_sound);
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ma_engine_uninit(&g_engine);
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SDL_CloseAudioDevice(deviceID);
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SDL_QuitSubSystem(SDL_INIT_AUDIO);
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<span style="color:#0033ff">return</span> 0;
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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 © 2022 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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