mirror of
https://github.com/mackron/miniaudio.git
synced 2026-04-22 00:06:59 +02:00
David Reid
442 lines
18 KiB
HTML
442 lines
18 KiB
HTML
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<title>miniaudio - A single file audio playback and capture library.</title>
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<meta name="description" content="miniaudio is a single file audio playback and capture library written in C.">
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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://www.reddit.com/r/miniaudio"><img src="../../img/reddit_white.svg" style="margin:0; padding:0; height:40px; width:40px;"></a>
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<td style="padding:0.1em; width:25%; text-align:right; vertical-align:center;">
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<a rel="me" href="https://fosstodon.org/@mackron"><img src="../../img/mastodon_white.svg" style="margin:0; padding:0; height:24px; width:32px;"></a>
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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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<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="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 doc-navigation-active">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 ">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>Data Source Chaining</h1><p>
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Demonstrates one way to chain together a number of data sources so they play back seamlessly
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without gaps.
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</p>
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<p>
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This example uses the chaining system built into the <span style="font-family:monospace;">ma_data_source</span> API. It will take every sound
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passed onto the command line in order, and then loop back and start again. When looping a chain of
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data sources, you need only link the last data source back to the first one.
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</p>
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<p>
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To play a chain of data sources, you first need to set up your chain. To set the data source that
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should be played after another, you have two options:
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</p>
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<ul style="overflow:hidden;">
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<li>
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Set a pointer to a specific data source</li>
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<li>
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Set a callback that will fire when the next data source needs to be retrieved</li>
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</ul>
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<p>
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The first option is good for simple scenarios. The second option is useful if you need to perform
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some action when the end of a sound is reached. This example will be using both.
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</p>
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<p>
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When reading data from a chain, you always read from the head data source. Internally miniaudio
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will track a pointer to the data source in the chain that is currently playing. If you don't
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consistently read from the head data source this state will become inconsistent and things won't
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work correctly. When using a chain, this pointer needs to be reset if you need to play the
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chain again from the start:
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</p>
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<p>
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</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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ma_data_source_set_current(&headDataSource, &headDataSource);
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ma_data_source_seek_to_pcm_frame(&headDataSource, 0);
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</pre></div><p>
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The code above is setting the "current" data source in the chain to the head data source, thereby
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starting the chain from the start again. It is also seeking the head data source back to the start
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so that playback starts from the start as expected. You do not need to seek non-head items back to
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the start as miniaudio will do that for you internally.</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_EXPERIMENTAL__DATA_LOOPING_AND_CHAINING
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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:#009900">/*
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For simplicity, this example requires the device to use floating point samples.
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*/</span>
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<span style="color:#666666">#define</span> SAMPLE_FORMAT ma_format_f32
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<span style="color:#666666">#define</span> CHANNEL_COUNT 2
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<span style="color:#666666">#define</span> SAMPLE_RATE 48000
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<span style="color:#0099cc">ma_uint32</span> g_decoderCount;
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<span style="color:#0099cc">ma_decoder</span>* g_pDecoders;
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<span style="color:#0033ff">static</span> <span style="color:#0099cc">ma_data_source</span>* next_callback_tail(<span style="color:#0099cc">ma_data_source</span>* pDataSource)
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{
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MA_ASSERT(g_decoderCount > 0); <span style="color:#009900">/* <-- We check for this in main() so should never happen. */</span>
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<span style="color:#009900">/*
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This will be fired when the last item in the chain has reached the end. In this example we want
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to loop back to the start, so we need only return a pointer back to the head.
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*/</span>
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<span style="color:#0033ff">return</span> &g_pDecoders[0];
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}
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<span style="color:#0033ff">static</span> <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:#009900">/*
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We can just read from the first decoder and miniaudio will resolve the chain for us. Note that
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if you want to loop the chain, like we're doing in this example, you need to set the <span style="font-family:monospace;">loop</span>
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parameter to false, or else only the current data source will be looped.
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*/</span>
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ma_data_source_read_pcm_frames(&g_pDecoders[0], pOutput, frameCount, NULL);
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<span style="color:#009900">/* Unused in this example. */</span>
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(<span style="color:#0033ff">void</span>)pDevice;
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(<span style="color:#0033ff">void</span>)pInput;
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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 = MA_SUCCESS;
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<span style="color:#0099cc">ma_uint32</span> iDecoder;
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<span style="color:#0099cc">ma_decoder_config</span> decoderConfig;
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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:#0033ff">if</span> (argc < 2) {
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printf(<span style="color:#cc3300">"No input files.\n"</span>);
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<span style="color:#0033ff">return</span> -1;
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}
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g_decoderCount = argc-1;
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g_pDecoders = (<span style="color:#0099cc">ma_decoder</span>*)malloc(<span style="color:#0033ff">sizeof</span>(*g_pDecoders) * g_decoderCount);
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<span style="color:#009900">/* In this example, all decoders need to have the same output format. */</span>
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decoderConfig = ma_decoder_config_init(SAMPLE_FORMAT, CHANNEL_COUNT, SAMPLE_RATE);
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<span style="color:#0033ff">for</span> (iDecoder = 0; iDecoder < g_decoderCount; ++iDecoder) {
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result = ma_decoder_init_file(argv[1+iDecoder], &decoderConfig, &g_pDecoders[iDecoder]);
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<span style="color:#0033ff">if</span> (result != MA_SUCCESS) {
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<span style="color:#0099cc">ma_uint32</span> iDecoder2;
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<span style="color:#0033ff">for</span> (iDecoder2 = 0; iDecoder2 < iDecoder; ++iDecoder2) {
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ma_decoder_uninit(&g_pDecoders[iDecoder2]);
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}
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free(g_pDecoders);
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printf(<span style="color:#cc3300">"Failed to load %s.\n"</span>, argv[1+iDecoder]);
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<span style="color:#0033ff">return</span> -1;
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}
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}
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<span style="color:#009900">/*
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We're going to set up our decoders to run one after the other, but then have the last one loop back
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to the first one. For demonstration purposes we're going to use the callback method for the last
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data source.
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*/</span>
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<span style="color:#0033ff">for</span> (iDecoder = 0; iDecoder < g_decoderCount-1; iDecoder += 1) {
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ma_data_source_set_next(&g_pDecoders[iDecoder], &g_pDecoders[iDecoder+1]);
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}
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<span style="color:#009900">/*
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For the last data source we'll loop back to the start, but for demonstration purposes we'll use a
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callback to determine the next data source in the chain.
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*/</span>
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ma_data_source_set_next_callback(&g_pDecoders[g_decoderCount-1], next_callback_tail);
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<span style="color:#009900">/*
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The data source chain has been established so now we can get the device up and running so we
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can listen to it.
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*/</span>
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deviceConfig = ma_device_config_init(ma_device_type_playback);
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deviceConfig.playback.format = SAMPLE_FORMAT;
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deviceConfig.playback.channels = CHANNEL_COUNT;
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deviceConfig.sampleRate = SAMPLE_RATE;
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deviceConfig.dataCallback = data_callback;
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deviceConfig.pUserData = NULL;
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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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result = -1;
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<span style="color:#0033ff">goto</span> done_decoders;
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}
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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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result = -1;
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<span style="color:#0033ff">goto</span> done;
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}
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printf(<span style="color:#cc3300">"Press Enter to quit..."</span>);
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getchar();
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done:
|
|
ma_device_uninit(&device);
|
|
|
|
done_decoders:
|
|
<span style="color:#0033ff">for</span> (iDecoder = 0; iDecoder < g_decoderCount; ++iDecoder) {
|
|
ma_decoder_uninit(&g_pDecoders[iDecoder]);
|
|
}
|
|
free(g_pDecoders);
|
|
|
|
<span style="color:#0033ff">return</span> 0;
|
|
}</pre></div></td>
|
|
</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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<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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<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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