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data-tocid="id-d5856e4651" class="topicref" data-id="id" data-state="not-ready"><span role="button" tabindex="0" aria-labelledby="button-expand-action id-d5856e4651-link" class="wh-expand-btn"></span><div class="title"><a href="../../../topics/sdk/mpp/mini_audio_player_user_guide.html" id="id-d5856e4651-link">MPP 音频播放器使用指南</a></div></div></li><li role="treeitem" aria-expanded="false"><div data-tocid="id-d5856e4724" class="topicref" data-id="id" data-state="not-ready"><span role="button" tabindex="0" aria-labelledby="button-expand-action id-d5856e4724-link" class="wh-expand-btn"></span><div class="title"><a href="../../../topics/sdk/lvgl/lvgl_introduction.html" id="id-d5856e4724-link">LVGL 使用指南</a></div></div></li></ul></li><li role="treeitem" aria-expanded="false"><div data-tocid="concept_nww_hzh_pzb-d5856e4868" class="topicref" data-id="concept_nww_hzh_pzb" data-state="not-ready"><span role="button" tabindex="0" aria-labelledby="button-expand-action 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<div class=" wh_topic_content body "><main role="main"><article class="- topic/topic concept/concept topic concept" role="article" aria-labelledby="ariaid-title1"><span class="edit-link" style="font-size:12px; opacity:0.6; text-align:right; vertical-align:middle"><a target="_blank" href="http://172.16.35.88/tasks/jdssno1uvvbf2mltu9kb9v3if05d5gopuakboe8hlud18rma/edit/F:/aicdita/aicdita-cn/topics/sdk/i2s/i2s_arch_lite.dita">Edit online</a></span><h1 class="- topic/title title topictitle1" id="ariaid-title1">I2S 架构设计</h1><div class="date inPage">15 Jan 2024</div><div style="color: gray;">
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Read time: 1 minute(s)
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</div><div class="- topic/body concept/conbody body conbody"><div class="- topic/div div section" id="i2s-arch-lite__rt-thread">
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<strong class="+ topic/ph hi-d/b ph b">RT-Thread 音频框架</strong>
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<p class="- topic/p p" data-ofbid="d121884e31__20250121171559">RT-Thread 定义了一套音频框架，driver 层的驱动就是为了对接该音频框架。该框架在录音端和播放端采用了两种不同的机制，现对录音端和播放端的框架进行简单说明。
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</p><figure class="- topic/fig fig fignone" id="i2s-arch-lite__fig_y5g_kkf_fdc" data-ofbid="i2s-arch-lite__fig_y5g_kkf_fdc"><br/><div class="imagecenter"><img class="- topic/image image imagecenter" id="i2s-arch-lite__image_z5g_kkf_fdc" src="../../../images/i2s/playback_arch.png" alt="playback_arch"/></div><br/><figcaption data-caption-side="bottom" class="- topic/title title figcapcenter"><span class="figtitleprefix fig--title-label">图<span class="fig--title-label-number"> 1</span><span class="fig--title-label-punctuation">. </span></span><span class="fig--title">播放端框架</span></figcaption></figure>
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<p class="- topic/p p" data-ofbid="d121884e40__20250121171559"> 如上图所示，应用层读取的音频数据写入到内存池的 block 中，并用数据队列对内存池的 block 数据进行管理。从数据队列中依次取出音频数据，写入到 TX
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||
buffer 中，TX buffer 在原理上是一个环形缓冲区，最后通过 DMA 将音频数据写入到硬件的 TXFIFO 中。所以，playback 端的 driver
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层驱动主要是负责 TX buffer 环形缓冲区的管理，及时写入音频数据，并用 DMA 搬运到硬件。 </p><figure class="- topic/fig fig fignone" id="i2s-arch-lite__fig_avg_kkf_fdc" data-ofbid="i2s-arch-lite__fig_avg_kkf_fdc"><br/><div class="imagecenter"><img class="- topic/image image imagecenter" id="i2s-arch-lite__image_bvg_kkf_fdc" src="../../../images/i2s/record_arch.png" alt="record_arch"/></div><br/><figcaption data-caption-side="bottom" class="- topic/title title figcapcenter"><span class="figtitleprefix fig--title-label">图<span class="fig--title-label-number"> 2</span><span class="fig--title-label-punctuation">. </span></span><span class="fig--title">录音端框架</span></figcaption></figure><p class="- topic/p p" data-ofbid="d121884e48__20250121171559">如上图所示，RT-Thread 音频框架在录音端的设计与播放端不同。在录音端框架虚拟了一个 pipe 设备，其实就是一个 ringbuffer，读写 pipe
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设备就是对 ringbuffer 的读写。driver 层驱动负责管理一个 RX buffer，RX buffer 在逻辑上也是一个环形缓冲区。DMA 负责将 MIC
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端接收到的数据搬运到 RX buffer，再通过写 pipe 设备将音频数据写入到 pipe 的 ringbuffer 中。应用层代码则通过
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<span class="+ topic/keyword pr-d/apiname keyword apiname">rt_device_read</span> 每次从 pipe 设备中读取音频数据，再将音频数据写入到 wav 文件。</p><div class="- topic/note note note note_note" id="i2s-arch-lite__note_yw4_qn3_ddc" data-ofbid="i2s-arch-lite__note_yw4_qn3_ddc"><span class="note__title">注：</span>
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<p class="- topic/p p" data-ofbid="d121884e55__20250121171559">与 audio 不同的是，i2s 还需要实现 codec 芯片的驱动设计才能完成音频的播放和录音功能</p>
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