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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/dvp/dvp_user_guide.dita">Edit online</a></span><h1 class="- topic/title title topictitle1" id="ariaid-title1">DVP 使用指南</h1><div class="date inPage">2 Dec 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/p p" data-ofbid="d103769e22__20250121171539">Digital Video Port (DVP) 模块是一个负责从 Sensor （传感器）中获取数据，经过格式转换或者缩放后输出到内存 (DRAM) 中的硬件组件。DVP
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模块应用于嵌入式系统和多媒体设备中，用于处理来自摄像头的视频数据。<div class="table-container"><table class="- topic/table table frame-all" id="concept_h4d_fwt_tzb__table_jwg_mmg_d1c" data-ofbid="concept_h4d_fwt_tzb__table_jwg_mmg_d1c" data-cols="3"><caption class="- topic/title title tablecap" data-caption-side="top" data-is-repeated="true"><span class="table--title-label">表<span class="table--title-label-number"> 1</span><span class="table--title-label-punctuation">. </span></span><span class="table--title">术语定义</span></caption><colgroup><col style="width:16.611295681063122%"/><col style="width:30.564784053156153%"/><col style="width:52.823920265780735%"/></colgroup><thead class="- topic/thead thead"><tr class="- topic/row"><th class="- topic/entry entry colsep-1 rowsep-1" id="concept_h4d_fwt_tzb__table_jwg_mmg_d1c__entry__1">术语</th><th class="- topic/entry entry colsep-1 rowsep-1" id="concept_h4d_fwt_tzb__table_jwg_mmg_d1c__entry__2">定义</th><th class="- topic/entry entry colsep-0 rowsep-1" id="concept_h4d_fwt_tzb__table_jwg_mmg_d1c__entry__3">注释说明</th></tr></thead><tbody class="- topic/tbody tbody"><tr class="- topic/row"><td class="- topic/entry entry colsep-1 rowsep-1" headers="concept_h4d_fwt_tzb__table_jwg_mmg_d1c__entry__1">CMA</td><td class="- topic/entry entry colsep-1 rowsep-1" headers="concept_h4d_fwt_tzb__table_jwg_mmg_d1c__entry__2">Contiguous Memory Allocator</td><td class="- topic/entry entry colsep-0 rowsep-1" headers="concept_h4d_fwt_tzb__table_jwg_mmg_d1c__entry__3">连续内存分配器</td></tr><tr class="- topic/row"><td class="- topic/entry entry colsep-1 rowsep-1" headers="concept_h4d_fwt_tzb__table_jwg_mmg_d1c__entry__1">DVP</td><td class="- topic/entry entry colsep-1 rowsep-1" headers="concept_h4d_fwt_tzb__table_jwg_mmg_d1c__entry__2">Digital Video Port</td><td class="- topic/entry entry colsep-0 rowsep-1" headers="concept_h4d_fwt_tzb__table_jwg_mmg_d1c__entry__3">用于接收视频数据数据，转换格式后存放到内存中</td></tr><tr class="- topic/row"><td class="- topic/entry entry colsep-1 rowsep-1" headers="concept_h4d_fwt_tzb__table_jwg_mmg_d1c__entry__1">VBI</td><td class="- topic/entry entry colsep-1 rowsep-1" headers="concept_h4d_fwt_tzb__table_jwg_mmg_d1c__entry__2">Vertical Blanking Interval</td><td class="- topic/entry entry colsep-0 rowsep-1" headers="concept_h4d_fwt_tzb__table_jwg_mmg_d1c__entry__3">垂直消隐期</td></tr><tr class="- topic/row"><td class="- topic/entry entry colsep-1 rowsep-1" headers="concept_h4d_fwt_tzb__table_jwg_mmg_d1c__entry__1">ISP</td><td class="- topic/entry entry colsep-1 rowsep-1" headers="concept_h4d_fwt_tzb__table_jwg_mmg_d1c__entry__2">Image Signal Processing</td><td class="- topic/entry entry colsep-0 rowsep-1" headers="concept_h4d_fwt_tzb__table_jwg_mmg_d1c__entry__3">图像信号处理，一般指对前端图像传感器输出信号的处理</td></tr><tr class="- topic/row"><td class="- topic/entry entry colsep-1 rowsep-1" headers="concept_h4d_fwt_tzb__table_jwg_mmg_d1c__entry__1">MBUS</td><td class="- topic/entry entry colsep-1 rowsep-1" headers="concept_h4d_fwt_tzb__table_jwg_mmg_d1c__entry__2">Media Bus</td><td class="- topic/entry entry colsep-0 rowsep-1" headers="concept_h4d_fwt_tzb__table_jwg_mmg_d1c__entry__3">V4L2 框架中用到的一种媒体类型，用于两个 L2 设备之间的协商</td></tr><tr class="- topic/row"><td class="- topic/entry entry colsep-1 rowsep-1" headers="concept_h4d_fwt_tzb__table_jwg_mmg_d1c__entry__1">MPP</td><td class="- topic/entry entry colsep-1 rowsep-1" headers="concept_h4d_fwt_tzb__table_jwg_mmg_d1c__entry__2">Media Process Platform</td><td class="- topic/entry entry colsep-0 rowsep-1" headers="concept_h4d_fwt_tzb__table_jwg_mmg_d1c__entry__3">通用多媒体处理软件平台</td></tr><tr class="- topic/row"><td class="- topic/entry entry colsep-1 rowsep-1" headers="concept_h4d_fwt_tzb__table_jwg_mmg_d1c__entry__1">Sensor</td><td class="- topic/entry entry colsep-1 rowsep-1" headers="concept_h4d_fwt_tzb__table_jwg_mmg_d1c__entry__2">即 Camera</td><td class="- topic/entry entry colsep-0 rowsep-1" headers="concept_h4d_fwt_tzb__table_jwg_mmg_d1c__entry__3">本文中指摄像头</td></tr><tr class="- topic/row"><td class="- topic/entry entry colsep-1 rowsep-0" headers="concept_h4d_fwt_tzb__table_jwg_mmg_d1c__entry__1">VIN</td><td class="- topic/entry entry colsep-1 rowsep-0" headers="concept_h4d_fwt_tzb__table_jwg_mmg_d1c__entry__2">Video Input</td><td class="- topic/entry entry colsep-0 rowsep-0" headers="concept_h4d_fwt_tzb__table_jwg_mmg_d1c__entry__3">视频输入（采集）模块</td></tr></tbody></table></div></div><section class="- topic/section section" id="concept_h4d_fwt_tzb__id3" data-ofbid="concept_h4d_fwt_tzb__id3"><h2 class="- topic/title title sectiontitle">模块特性</h2>
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<ul class="- topic/ul ul simple" id="concept_h4d_fwt_tzb__ul_qyb_ydt_2dc" data-ofbid="concept_h4d_fwt_tzb__ul_qyb_ydt_2dc"><li class="- topic/li li" data-ofbid="d103769e102__20250121171539">
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<p class="- topic/p p" data-ofbid="d103769e104__20250121171539">最大支持 1080P@30 帧 录像</p>
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</li><li class="- topic/li li" data-ofbid="d103769e107__20250121171539">
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<p class="- topic/p p" data-ofbid="d103769e109__20250121171539">支持 5M 拍照</p>
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</li><li class="- topic/li li" data-ofbid="d103769e112__20250121171539">
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<p class="- topic/p p" data-ofbid="d103769e114__20250121171539">支持 YUV422 和 BT.656 两种方式，BT.656 支持隔行模式，最大支持 8 位输入</p>
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</li><li class="- topic/li li" data-ofbid="d103769e117__20250121171539">
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<p class="- topic/p p" data-ofbid="d103769e119__20250121171539">支持针对图像帧中的行和列分别做裁剪</p>
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</li></ul>
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<p class="- topic/p p" data-ofbid="d103769e123__20250121171539">目前，<span class="- topic/ph ph">Luban-Lite</span> DVP 驱动已支持的 Camera 型号有：</p>
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<ul class="- topic/ul ul simple" id="concept_h4d_fwt_tzb__ul_ryb_ydt_2dc" data-ofbid="concept_h4d_fwt_tzb__ul_ryb_ydt_2dc"><li class="- topic/li li" data-ofbid="d103769e130__20250121171539">
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<p class="- topic/p p" data-ofbid="d103769e132__20250121171539">OV2640、OV2659、OV5640、OV7670</p>
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</li><li class="- topic/li li" data-ofbid="d103769e135__20250121171539">
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<p class="- topic/p p" data-ofbid="d103769e137__20250121171539">TP9950（HD-TVI/CVBS/HD Analog Video Decoder）</p>
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</li><li class="- topic/li li" data-ofbid="d103769e140__20250121171539">
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<p class="- topic/p p" data-ofbid="d103769e142__20250121171539">GM7150（低功耗 NTSC/PAL 视频解码器）</p>
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</li></ul>
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<p class="- topic/p p" data-ofbid="d103769e146__20250121171539">DVP 的硬件框图：</p>
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<figure class="- topic/fig fig fignone" id="concept_h4d_fwt_tzb__id4" data-ofbid="concept_h4d_fwt_tzb__id4"><br/><div class="imagecenter"><img class="- topic/image image imagecenter" id="concept_h4d_fwt_tzb__image_syb_ydt_2dc" src="../../../images/dvp/dvp_hw_structure.png" alt="dvp_hw_structure"/></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">DVP 硬件架构</span></figcaption></figure>
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</section><section class="- topic/section section" id="concept_h4d_fwt_tzb__section_yht_1ft_2dc" data-ofbid="concept_h4d_fwt_tzb__section_yht_1ft_2dc"><h2 class="- topic/title title sectiontitle">应用场景</h2>
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<p class="- topic/p p" data-ofbid="d103769e162__20250121171539">从整个系统看，DVP 有以下应用场景：</p>
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<ol class="- topic/ol ol arabic simple" id="concept_h4d_fwt_tzb__ol_tyb_ydt_2dc" data-ofbid="concept_h4d_fwt_tzb__ol_tyb_ydt_2dc"><li class="- topic/li li" data-ofbid="d103769e166__20250121171539">
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<p class="- topic/p p" data-ofbid="d103769e168__20250121171539">从传感器采集数据到内存中，然后让 DE 将其显示到屏幕上。</p>
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</li><li class="- topic/li li" data-ofbid="d103769e171__20250121171539">
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<p class="- topic/p p" data-ofbid="d103769e173__20250121171539">从传感器采集数据到内存中，使用 CPU 或者 VE 进行编码，最后再将编码后的数据保存到内存中。</p>
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</li></ol>
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<figure class="- topic/fig fig fignone" id="concept_h4d_fwt_tzb__id5" data-ofbid="concept_h4d_fwt_tzb__id5"><br/><div class="imagecenter"><img class="- topic/image image imagecenter" id="concept_h4d_fwt_tzb__image_uyb_ydt_2dc" src="../../../images/dvp/dvp_hw_data_flow.jpg" width="480" alt="dvp_hw_data_flow"/></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">DVP 应用的数据流</span></figcaption></figure>
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