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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">
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<span class="edit-link" style="font-size:12px; opacity:0.6; text-align:right; vertical-align:middle"><a target="_blank" title="Edit this document" href="http://172.16.35.88/tasks/jdssno1uvvbf2mltu9kb9v3if05d5gopuakboe8hlud18rma/edit/F:/aicdita/aicdita-cn/topics/sdk/audio_codec/audio-codec-test_guide.dita">Edit online</a></span><h1 class="- topic/title title topictitle1" id="ariaid-title1">测试指南</h1>
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<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>
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<div class="- topic/body concept/conbody body conbody">
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<div class="- topic/p p" data-ofbid="d167498e33__20250123155217">测试环境：<ul class="- topic/ul ul" id="audio_codec_test_guide__ol_ehg_pym_d1c" data-ofbid="audio_codec_test_guide__ol_ehg_pym_d1c">
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<li class="- topic/li li" data-ofbid="d167498e37__20250123155217">硬件<ul class="- topic/ul ul" id="audio_codec_test_guide__ul_rg5_nym_d1c" data-ofbid="audio_codec_test_guide__ul_rg5_nym_d1c">
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<li class="- topic/li li" data-ofbid="d167498e41__20250123155217">
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<p class="- topic/p p" data-ofbid="d167498e43__20250123155217">测试板：带有 DMIC 的测试板</p>
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||
</li>
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||
<li class="- topic/li li" data-ofbid="d167498e47__20250123155217">
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<p class="- topic/p p" data-ofbid="d167498e49__20250123155217">PC：用于和测试板交互</p>
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</li>
|
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<li class="- topic/li li" data-ofbid="d167498e53__20250123155217">
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<p class="- topic/p p" data-ofbid="d167498e55__20250123155217">串口线：连接测试板的调试串口</p>
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</li>
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</ul></li>
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<li class="- topic/li li" data-ofbid="d167498e60__20250123155217">软件<ul class="- topic/ul ul" id="audio_codec_test_guide__ul_sg5_nym_d1c" data-ofbid="audio_codec_test_guide__ul_sg5_nym_d1c">
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<li class="- topic/li li" data-ofbid="d167498e64__20250123155217">
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<p class="- topic/p p" data-ofbid="d167498e66__20250123155217">PC 端串口终端软件</p>
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</li>
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<li class="- topic/li li" data-ofbid="d167498e70__20250123155217">
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<p class="- topic/p p" data-ofbid="d167498e72__20250123155217">alsa-lib 和 utils 第三方软件包</p>
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</li>
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</ul></li>
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</ul></div>
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<div class="- topic/p p" data-ofbid="d167498e78__20250123155217">具体测试步骤如下：<ol class="- topic/ol ol" id="audio_codec_test_guide__ul_vdx_czm_d1c" data-ofbid="audio_codec_test_guide__ul_vdx_czm_d1c">
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<li class="- topic/li li" data-ofbid="d167498e82__20250123155217">创建声卡<p class="- topic/p p" data-ofbid="d167498e84__20250123155217">AudioCodec 是 SOC 内置的 codec，所以在 AudioCodec 的驱动中，已直接创建声卡，不需要再单独编写 machine 驱动。在完成
|
||
<a xml:lang="zh-CN" lang="zh-CN" class="- topic/xref xref" href="audio-codec-configuration.html">Audio Codec 配置</a> 后，内核会创建出名 aic-SoundCard
|
||
的声卡，对此声卡进行操作即可。</p></li>
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<li class="- topic/li li" data-ofbid="d167498e91__20250123155217">音频测试<ol class="- topic/ol ol" type="a" id="audio_codec_test_guide__ol_zs3_2zm_d1c" data-ofbid="audio_codec_test_guide__ol_zs3_2zm_d1c">
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||
<li class="- topic/li li" data-ofbid="d167498e95__20250123155217">配置音频路径<div class="- topic/p p" data-ofbid="d167498e97__20250123155217">AudioCodec 的音频通路中，存在较多的开关，混音器，数字音量调节器，多路选择器等器件。所以在执行
|
||
播放或录音任务前，需要先配置音频路径，使音频数据可以正确流通。<ul class="- topic/ul ul" id="audio_codec_test_guide__ul_u2r_mzm_d1c" data-ofbid="audio_codec_test_guide__ul_u2r_mzm_d1c">
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||
<li class="- topic/li li" data-ofbid="d167498e101__20250123155217">自动配置<p class="- topic/p p" data-ofbid="d167498e103__20250123155217">在 SDK 的<span class="+ topic/ph sw-d/filepath ph filepath">target/aic16xx/perxx/rootfs_overlay/var/lib/alsa</span>目录下，存放有 state 文件，该文件保存的是声卡各个控件的配置值。在内核启动时，会自动加载该文件，
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||
完成音频通路的配置。</p><div class="- topic/p p" data-ofbid="d167498e108__20250123155217"><br/><div class="imagecenter"><img class="- topic/image image imagecenter" id="audio_codec_test_guide__image_wg5_nym_d1c" src="../../../images/audio/load_asound_state.png" alt="load_asound_state"/></div><br/></div></li>
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<li class="- topic/li li" data-ofbid="d167498e115__20250123155217">手动配置<div class="- topic/p p" data-ofbid="d167498e117__20250123155217">一般使用 state 文件默认的配置即可。如果内核启动时的默认配置不满足需求，也可以通过 amixer 工具进行手动配置。amixer 的使用方法如下：<pre class="+ topic/pre pr-d/codeblock pre codeblock language-c" id="audio_codec_test_guide__codeblock_pgz_hyh_p1c" data-ofbid="audio_codec_test_guide__codeblock_pgz_hyh_p1c"><code>amixer sset <span class="hl-string">'control-name-string'</span> value
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||
</code></pre></div><p class="- topic/p p" data-ofbid="d167498e121__20250123155217">control-name-string 和 value 的值可以通过以下方式查看：</p><div class="- topic/p p" data-ofbid="d167498e123__20250123155217"><br/><div class="imagecenter"><img class="- topic/image image imagecenter" id="audio_codec_test_guide__image_zg5_nym_d1c" src="../../../images/audio/amixer_scontents.png" alt="amixer_scontents"/></div><br/></div><p class="- topic/p p" data-ofbid="d167498e129__20250123155217">修改设置示例：</p><div class="- topic/p p" data-ofbid="d167498e131__20250123155217"><br/><div class="imagecenter"><img class="- topic/image image imagecenter" id="audio_codec_test_guide__image_ah5_nym_d1c" src="../../../images/audio/amixer_example.png" alt="amixer_example"/></div><br/></div><p class="- topic/p p" data-ofbid="d167498e137__20250123155217">修改完成后，可以通过 alsactl 命令将修改保存到 asound.state 文件中。在后续的上电过程中，内核会加载最新的修改配置。</p><pre class="+ topic/pre pr-d/codeblock pre codeblock language-c" id="audio_codec_test_guide__pre_bh5_nym_d1c" data-ofbid="audio_codec_test_guide__pre_bh5_nym_d1c"><code>alsactl -f /var/lib/alsa/asound.state store
|
||
</code></pre></li>
|
||
</ul></div></li>
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||
<li class="- topic/li li" data-ofbid="d167498e143__20250123155217">测试音频播放<pre class="+ topic/pre pr-d/codeblock pre codeblock language-c" id="audio_codec_test_guide__codeblock_wyl_4zm_d1c" data-ofbid="audio_codec_test_guide__codeblock_wyl_4zm_d1c"><code>aplay test.wav</code></pre></li>
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<li class="- topic/li li" data-ofbid="d167498e148__20250123155217">测试音频录音<pre class="+ topic/pre pr-d/codeblock pre codeblock language-c" id="audio_codec_test_guide__codeblock_nhq_pzm_d1c" data-ofbid="audio_codec_test_guide__codeblock_nhq_pzm_d1c"><code>arecord -d <span class="hl-number">10</span> -f dat -t wav test.wav</code></pre><ul class="- topic/ul ul" id="audio_codec_test_guide__ul_ocn_qzm_d1c" data-ofbid="audio_codec_test_guide__ul_ocn_qzm_d1c">
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<li class="- topic/li li" data-ofbid="d167498e154__20250123155217">-d：指定录音时长，单位为秒</li>
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||
<li class="- topic/li li" data-ofbid="d167498e157__20250123155217">-f：指定录制的格式，dat 表示 16bit 小端数据，48K 采样率，立体声</li>
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<li class="- topic/li li" data-ofbid="d167498e160__20250123155217">-t：指定生成的文件格式，为 wav 文件</li>
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<li class="- topic/li li" data-ofbid="d167498e163__20250123155217">test.wav：生成的 wav 文件名</li>
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</ul></li>
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<li class="- topic/li li" data-ofbid="d167498e167__20250123155217">调整播放音量<pre class="+ topic/pre pr-d/codeblock pre codeblock language-c" id="audio_codec_test_guide__codeblock_lpd_jyh_p1c" data-ofbid="audio_codec_test_guide__codeblock_lpd_jyh_p1c"><code>amixer sset <span class="hl-string">'AUDIO'</span><span class="hl-number">140</span></code></pre></li>
|
||
<li class="- topic/li li" data-ofbid="d167498e172__20250123155217">调整 DMIC 录音音量<pre class="+ topic/pre pr-d/codeblock pre codeblock language-c" id="audio_codec_test_guide__codeblock_c5t_jyh_p1c" data-ofbid="audio_codec_test_guide__codeblock_c5t_jyh_p1c"><code>amixer sset <span class="hl-string">'DMICIN'</span><span class="hl-number">140</span></code></pre></li>
|
||
<li class="- topic/li li" data-ofbid="d167498e178__20250123155217">调整 AMIC 录音音量<pre class="+ topic/pre pr-d/codeblock pre codeblock language-c" id="audio_codec_test_guide__codeblock_nzg_kyh_p1c" data-ofbid="audio_codec_test_guide__codeblock_nzg_kyh_p1c"><code>amixer sset <span class="hl-string">'ADC'</span><span class="hl-number">140</span></code></pre></li>
|
||
<li class="- topic/li li" data-ofbid="d167498e183__20250123155217">调整 PGA 增益<pre class="+ topic/pre pr-d/codeblock pre codeblock language-c" id="audio_codec_test_guide__codeblock_ihs_kyh_p1c" data-ofbid="audio_codec_test_guide__codeblock_ihs_kyh_p1c"><code>amixer sset <span class="hl-string">'PGA Gain'</span><span class="hl-number">8</span></code></pre></li>
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</ol></li>
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