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<div class=" wh_topic_content body "><main role="main"><article class="- topic/topic topic" 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/audio/audio_faq.dita">Edit online</a></span><h1 class="- topic/title title topictitle1" id="ariaid-title1">常见问题</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 body"><section class="- topic/section section" id="id__section_bqh_gpv_ddc" data-ofbid="id__section_bqh_gpv_ddc"><h2 class="- topic/title title sectiontitle">播放音频文件时会先播放一段 0 数据</h2>
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<p class="- topic/p p" data-ofbid="d39041e24__20250121171516">在 RT-Thread 的 Audio 框架中，播放音频时出现起始部分为 0 数据的问题确实比较常见。这主要是由于内存池管理机制导致的。当读取的音频数据长度小于内存池一个
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block 的大小时，即使已经将音频数据写入内存池，也不会立即将该 block 加入到数据队列中，而是等到一个 block 写满才加入数据队列。尽管未加入数据队列，但
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audio 框架也会立即开始传输。此时数据队列中没有任何数据，会先填充一个 period_len 长度的 0 数据，所以播放会有 0 数据出现，示意图如下：</p>
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<div class="- topic/div div">
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<figure class="- topic/fig fig fignone" id="id__fig_t2l_dpv_ddc" data-ofbid="id__fig_t2l_dpv_ddc"><br/><div class="imagecenter"><img class="- topic/image image imagecenter" id="id__image_u2l_dpv_ddc" src="../../../images/media/zero-data.png" alt="zero-data"/></div><br/></figure>
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<div class="- topic/p p" data-ofbid="d39041e34__20250121171516">为了避免播放起始部分出现
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0
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数据，可以采取以下几种方法：<ul class="- topic/ul ul" id="id__ul_gdw_zqv_ddc" data-ofbid="id__ul_gdw_zqv_ddc"><li class="- topic/li li" data-ofbid="d39041e37__20250121171516">在应用层增大读取音频文件的 buffer 长度，使其与内存池的 block 大小相同。<p class="- topic/p p" data-ofbid="d39041e39__20250121171516">这样在第一次写内存池时，就可以将 block
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加入到数据队列。如下图所示：</p><figure class="- topic/fig fig fignone" id="id__fig_v2l_dpv_ddc" data-ofbid="id__fig_v2l_dpv_ddc"><br/><div class="imagecenter"><img class="- topic/image image imagecenter" id="id__image_w2l_dpv_ddc" src="../../../images/media/no-zero-data.png" alt="no-zero-data"/></div><br/></figure></li><li class="- topic/li li" data-ofbid="d39041e45__20250121171516">预填充音频数据，即在开始播放之前，先向内存池中预填充一段音频数据。这样在播放开始时，内存池中已经有数据可供传输，避免了播放起始部分出现 0
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数据。</li></ul></div>
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</div>
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</section><section class="- topic/section section" id="id__section_cqh_gpv_ddc" data-ofbid="id__section_cqh_gpv_ddc"><h2 class="- topic/title title sectiontitle">播放时应用层可设置的 buffer 大小范围是多少</h2>
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<div class="- topic/div div">
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<p class="- topic/p p" data-ofbid="d39041e56__20250121171516">在 RT-Thread 的 Audio 框架中，应用层设置的 buffer 大小范围受到内存池配置的限制。具体来说，应用层一次读取音频文件的最大 buffer
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大小是 <code class="+ topic/ph pr-d/codeph ph codeph"><span class="+ topic/keyword pr-d/parmname keyword parmname">RT_AU×DIO_REPLAY_MP_BLOCK_SIZE</span> ×
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<span class="+ topic/keyword pr-d/parmname keyword parmname">RT_AUDIO_REPLAY_MP_BLOCK_COUNT</span></code>。</p>
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<div class="- topic/p p" data-ofbid="d39041e66__20250121171516">Driver 层的默认配置如下：<ul class="- topic/ul ul" id="id__ul_zhj_krv_ddc" data-ofbid="id__ul_zhj_krv_ddc"><li class="- topic/li li" data-ofbid="d39041e69__20250121171516"><span class="+ topic/keyword pr-d/parmname keyword parmname">RT_AUDIO_REPLAY_MP_BLOCK_SIZE</span> 的值为 2048（字节）</li><li class="- topic/li li" data-ofbid="d39041e73__20250121171516"><span class="+ topic/keyword pr-d/parmname keyword parmname">RT_AUDIO_REPLAY_MP_BLOCK_COUNT</span> 的值为 2</li></ul></div>
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<p class="- topic/p p" data-ofbid="d39041e78__20250121171516">因此，可设置的最大 buffer 大小为 <code class="+ topic/ph pr-d/codeph ph codeph">RT_AUDIO_REPLAY_MP_BLOCK_SIZE ×
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RT_AUDIO_REPLAY_MP_BLOCK_COUNT = 2048 * 2 = 4096</code>。</p>
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<div class=" wh_topic_toc "><div class="wh_topic_label">在本页上</div><ul><li class="section-item"><div class="section-title"><a href="#id__section_bqh_gpv_ddc" data-tocid="id__section_bqh_gpv_ddc">播放音频文件时会先播放一段 0 数据</a></div></li><li class="section-item"><div class="section-title"><a href="#id__section_cqh_gpv_ddc" data-tocid="id__section_cqh_gpv_ddc">播放时应用层可设置的 buffer 大小范围是多少</a></div></li></ul></div>
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