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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/ve/ve_design_guide_lite.dita">Edit online</a></span><h1 class="- topic/title title topictitle1" id="ariaid-title1">设计说明</h1><div class="date inPage">15 Jan 2024</div><div style="color: gray;">
Read time: 3 minute(s)
</div><div class="- topic/body body"><div class="- topic/div div section" id="id__id2">
<strong class="+ topic/ph hi-d/b ph b">源码说明</strong>
<p class="- topic/p p" data-ofbid="d88088e24__20250121171530">源代码位于 <code class="+ topic/ph pr-d/codeph ph codeph">bsp/artinchip/</code>： </p><ul class="- topic/ul ul simple" id="id__ul_dxh_l4f_fdc" data-ofbid="id__ul_dxh_l4f_fdc"><li class="- topic/li li" data-ofbid="d88088e30__20250121171530">
<p class="- topic/p p" data-ofbid="d88088e32__20250121171530"><span class="+ topic/ph sw-d/filepath ph filepath">bsp/artinchip/drv/ve/aic_drv_ve.c</span>， VE Driver 层实现</p>
</li><li class="- topic/li li" data-ofbid="d88088e37__20250121171530">
<p class="- topic/p p" data-ofbid="d88088e39__20250121171530"><span class="+ topic/ph sw-d/filepath ph filepath">bsp/artinchip/hal/ve/aic_hal_ve.c</span>， VE HAL 层实现</p>
</li><li class="- topic/li li" data-ofbid="d88088e44__20250121171530">
<p class="- topic/p p" data-ofbid="d88088e46__20250121171530"><span class="+ topic/ph sw-d/filepath ph filepath">bsp/artinchip/include/drv/aic_drv_ve.h</span>，VE Drv 层接口头文件</p>
</li><li class="- topic/li li" data-ofbid="d88088e51__20250121171530">
<p class="- topic/p p" data-ofbid="d88088e53__20250121171530"><span class="+ topic/ph sw-d/filepath ph filepath">bsp/artinchip/include/hal/aic_hal_ve.h</span>， VE HAL
层接口头文件</p>
</li></ul></div><section class="- topic/section section" id="id__section_xfj_m4f_fdc" data-ofbid="id__section_xfj_m4f_fdc"><h2 class="- topic/title title sectiontitle">模块架构</h2>
<div class="- topic/div div section">
<ul class="- topic/ul ul simple" id="id__ul_exh_l4f_fdc" data-ofbid="id__ul_exh_l4f_fdc"><li class="- topic/li li" data-ofbid="d88088e66__20250121171530">
<p class="- topic/p p" data-ofbid="d88088e68__20250121171530">VE HAL ：负责 VE 硬件资源初始化和获取等</p>
</li><li class="- topic/li li" data-ofbid="d88088e71__20250121171530">
<p class="- topic/p p" data-ofbid="d88088e73__20250121171530">VE DRV ：对 HAL 层的封装，向上提供更简洁的接口</p>
</li><li class="- topic/li li" data-ofbid="d88088e76__20250121171530">
<p class="- topic/p p" data-ofbid="d88088e78__20250121171530">MPP ：直接掉用 HAL 层接口，处理编解码逻辑，寄存器配置等</p>
</li><li class="- topic/li li" data-ofbid="d88088e81__20250121171530">
<p class="- topic/p p" data-ofbid="d88088e83__20250121171530">APP ：应用层调用 MPP 层接口，即可实现对 VE 的操作</p>
</li></ul>
<figure class="- topic/fig fig fignone" id="id__id10" data-ofbid="id__id10"><br/><div class="imagecenter"><img class="- topic/image image imagecenter" id="id__image_fxh_l4f_fdc" src="../../../images/ve/ve_framework_lite.png" alt="ve_framework"/></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">VE 驱动框架</span></figcaption></figure>
<dl class="- topic/dl dl simple" id="id__dl_gxh_l4f_fdc" data-ofbid="id__dl_gxh_l4f_fdc"><dt class="- topic/dt dt dlterm" data-ofbid="d88088e96__20250121171530"> 操作 VE 基本流程如下：</dt><dd class="- topic/dd dd">
<ol class="- topic/ol ol arabic simple" id="id__ol_hxh_l4f_fdc" data-ofbid="id__ol_hxh_l4f_fdc"><li class="- topic/li li" data-ofbid="d88088e101__20250121171530">
<p class="- topic/p p" data-ofbid="d88088e103__20250121171530">调用 drv_ve_open 打开 VE 驱动；</p>
</li><li class="- topic/li li" data-ofbid="d88088e106__20250121171530">
<p class="- topic/p p" data-ofbid="d88088e108__20250121171530">调用 drv_ve_control(IOC_VE_GET_CLIENT) 获取 ve 硬件设备独占权限；</p>
</li><li class="- topic/li li" data-ofbid="d88088e111__20250121171530">
<p class="- topic/p p" data-ofbid="d88088e113__20250121171530">程序完成一次独立的编解码任务：配置寄存器、等待 VE 当前任务完成；</p>
</li><li class="- topic/li li" data-ofbid="d88088e116__20250121171530">
<p class="- topic/p p" data-ofbid="d88088e118__20250121171530">调用 drv_ve_control(IOC_VE_PUT_CLIENT) 释放 ve 硬件设备独占权限；</p>
</li><li class="- topic/li li" data-ofbid="d88088e121__20250121171530">
<p class="- topic/p p" data-ofbid="d88088e123__20250121171530">视频帧解码完成，调用 drv_ve_close 关闭 VE 驱动。</p>
</li></ol>
</dd></dl>
</div>
</section><section class="- topic/section section" id="id__section_nkt_44f_fdc" data-ofbid="id__section_nkt_44f_fdc"><h2 class="- topic/title title sectiontitle">关键流程设计</h2>
<div class="- topic/div div section" id="id__id5">
<strong class="+ topic/ph hi-d/b ph b">中断处理流程</strong>
<ol class="- topic/ol ol" id="id__ol_v5z_r4f_fdc" data-ofbid="id__ol_v5z_r4f_fdc"><li class="- topic/li li" data-ofbid="d88088e140__20250121171530">
<div class="- topic/p p" data-ofbid="d88088e142__20250121171530">VE 中断类型有三种，包括：finish 中断、error 中断、bit request 中断。<ul class="- topic/ul ul simple" id="id__ul_ixh_l4f_fdc" data-ofbid="id__ul_ixh_l4f_fdc"><li class="- topic/li li" data-ofbid="d88088e145__20250121171530">
<p class="- topic/p p" data-ofbid="d88088e147__20250121171530">finish 中断表示 VE 任务正常结束</p>
</li><li class="- topic/li li" data-ofbid="d88088e150__20250121171530">
<p class="- topic/p p" data-ofbid="d88088e152__20250121171530">error 中断表示 VE 处理任务过程中出错</p>
</li><li class="- topic/li li" data-ofbid="d88088e155__20250121171530">
<p class="- topic/p p" data-ofbid="d88088e157__20250121171530">bit request 中断表示当前数据不足以完成一次完整的任务，需要继续发送数据</p>
</li></ul></div>
</li><li class="- topic/li li" data-ofbid="d88088e161__20250121171530">
<div class="- topic/p p" data-ofbid="d88088e163__20250121171530">上层程序对 VE 中断的处理<ul class="- topic/ul ul simple" id="id__ul_jxh_l4f_fdc" data-ofbid="id__ul_jxh_l4f_fdc"><li class="- topic/li li" data-ofbid="d88088e166__20250121171530">
<p class="- topic/p p" data-ofbid="d88088e168__20250121171530">finish 中断处理：VE 正常结束，释放 VE 硬件设备独占权限</p>
</li><li class="- topic/li li" data-ofbid="d88088e171__20250121171530">
<p class="- topic/p p" data-ofbid="d88088e173__20250121171530">bit request 中断处理：再次发送一笔数据，重新启动 VE 执行任务，重复以上过程，直到 VE 返回 finish
或 error 中断</p>
</li><li class="- topic/li li" data-ofbid="d88088e176__20250121171530">
<p class="- topic/p p" data-ofbid="d88088e178__20250121171530">error 中断：VE 执行出错，必须对 VE 进行硬件复位避免错误影响下次任务</p>
</li><li class="- topic/li li" data-ofbid="d88088e181__20250121171530">
<p class="- topic/p p" data-ofbid="d88088e183__20250121171530">等中断超时：此时 VE 出现未知异常，必须对 VE 进行硬件复位</p>
</li></ul><div class="- topic/note note note note_note" id="id__note_cmq_qn3_ddc" data-ofbid="id__note_cmq_qn3_ddc"><span class="note__title">注：</span>
<p class="- topic/p p" data-ofbid="d88088e188__20250121171530">处理 bit request 中断时，不能释放 VE
硬件设备独占权限，因为两次任务处理有相关性。如果这两次任务之间执行其他任务，会影响 VE
内部状态，从而导致该次任务执行出错。</p>
</div></div>
</li></ol></div>
<div class="- topic/div div section" id="id__id6">
<strong class="+ topic/ph hi-d/b ph b">多线程支持</strong>
<ul class="- topic/ul ul simple" id="id__ul_kxh_l4f_fdc" data-ofbid="id__ul_kxh_l4f_fdc"><li class="- topic/li li" data-ofbid="d88088e199__20250121171530">
<p class="- topic/p p" data-ofbid="d88088e201__20250121171530">VE 设备只有一个，所以同一时间只能执行一个任务。当多个线程同时操作 VE 驱动时，VE 只能分时复用。因此上层程序在操作 VE 之前，必须获得
VE 的独占权限。</p>
</li><li class="- topic/li li" data-ofbid="d88088e204__20250121171530">
<p class="- topic/p p" data-ofbid="d88088e206__20250121171530">VE 驱动通过 IOC_VE_GET_CLIENT/IOC_VE_PUT_CLIENT 这两个 drv_ve_control
接口为上层程序提供获取和释放 VE 独占权限功能。</p>
</li><li class="- topic/li li" data-ofbid="d88088e209__20250121171530">
<p class="- topic/p p" data-ofbid="d88088e211__20250121171530">为避免每个线程都执行 VE 驱动初始化等重复操作，建议用户态程序使用单例模式实现 VE 驱动调用。具体实现可参考 mpp
代码（packages/artinchip/mpp/ve/common/ve.c）。</p>
</li></ul></div>
</section><section class="- topic/section section" id="id__section_lyv_t4f_fdc" data-ofbid="id__section_lyv_t4f_fdc"><h2 class="- topic/title title sectiontitle">数据结构设计</h2>
<div class="- topic/div div section" id="id__id7">
<div class="- topic/div div section" id="id__id8">
<strong class="+ topic/ph hi-d/b ph b"></strong>
<pre class="+ topic/pre pr-d/codeblock pre codeblock language-c" id="id__codeblock_lxh_l4f_fdc" data-ofbid="id__codeblock_lxh_l4f_fdc"><em class="hl-comment">// 中断信息结构体</em>
<strong class="hl-keyword">struct</strong> wait_info {
<strong class="hl-keyword">int</strong> wait_time;
<strong class="hl-keyword">unsigned</strong> <strong class="hl-keyword">int</strong> reg_status;
};
<em class="hl-comment">//VE 硬件抽象</em>
<strong class="hl-keyword">struct</strong> aic_ve_client {
u32 status;
aicos_event_t wait_event;
aicos_mutex_t lock;
};</pre>
</div>
</div>
</section><section class="- topic/section section" id="id__section_tm3_v4f_fdc" data-ofbid="id__section_tm3_v4f_fdc"><h2 class="- topic/title title sectiontitle">接口设计</h2>
<div class="table-container"><table class="- topic/table table frame-all" id="id__table_mxh_l4f_fdc" data-ofbid="id__table_mxh_l4f_fdc" data-cols="2"><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">drv_ve_open</span></caption><colgroup><col style="width:16.666666666666664%"/><col style="width:83.33333333333334%"/></colgroup><thead class="- topic/thead thead"><tr class="- topic/row"><th class="- topic/entry entry colsep-1 rowsep-1" id="id__table_mxh_l4f_fdc__entry__1">函数原型</th><th class="- topic/entry entry colsep-0 rowsep-1" id="id__table_mxh_l4f_fdc__entry__2">struct aic_ve_client *drv_ve_open(void)</th></tr></thead><tbody class="- topic/tbody tbody"><tr class="- topic/row"><td class="- topic/entry entry colsep-1 rowsep-1" headers="id__table_mxh_l4f_fdc__entry__1">功能说明</td><td class="- topic/entry entry colsep-0 rowsep-1" headers="id__table_mxh_l4f_fdc__entry__2">打开 VE 设备</td></tr><tr class="- topic/row"><td class="- topic/entry entry colsep-1 rowsep-1" headers="id__table_mxh_l4f_fdc__entry__1">参数定义</td><td class="- topic/entry entry colsep-0 rowsep-1" headers="id__table_mxh_l4f_fdc__entry__2">无</td></tr><tr class="- topic/row"><td class="- topic/entry entry colsep-1 rowsep-1" headers="id__table_mxh_l4f_fdc__entry__1">返回值</td><td class="- topic/entry entry colsep-0 rowsep-1" headers="id__table_mxh_l4f_fdc__entry__2">
<div class="- topic/div div">
<div class="- topic/div div">VE 设备</div>
</div>
</td></tr><tr class="- topic/row"><td class="- topic/entry entry colsep-1 rowsep-0" headers="id__table_mxh_l4f_fdc__entry__1">注意事项</td><td class="- topic/entry entry colsep-0 rowsep-0" headers="id__table_mxh_l4f_fdc__entry__2">- </td></tr></tbody></table></div>
<div class="table-container"><table class="- topic/table table frame-all" id="id__table_nxh_l4f_fdc" data-ofbid="id__table_nxh_l4f_fdc" data-cols="2"><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"> 2</span><span class="table--title-label-punctuation">. </span></span><span class="table--title">drv_ve_close</span></caption><colgroup><col style="width:16.666666666666664%"/><col style="width:83.33333333333334%"/></colgroup><thead class="- topic/thead thead"><tr class="- topic/row"><th class="- topic/entry entry colsep-1 rowsep-1" id="id__table_nxh_l4f_fdc__entry__1">函数原型</th><th class="- topic/entry entry colsep-0 rowsep-1" id="id__table_nxh_l4f_fdc__entry__2">int drv_ve_close(struct aic_ve_client *client)</th></tr></thead><tbody class="- topic/tbody tbody"><tr class="- topic/row"><td class="- topic/entry entry colsep-1 rowsep-1" headers="id__table_nxh_l4f_fdc__entry__1">功能说明</td><td class="- topic/entry entry colsep-0 rowsep-1" headers="id__table_nxh_l4f_fdc__entry__2">关闭 VE 设备</td></tr><tr class="- topic/row"><td class="- topic/entry entry colsep-1 rowsep-1" headers="id__table_nxh_l4f_fdc__entry__1">参数定义</td><td class="- topic/entry entry colsep-0 rowsep-1" headers="id__table_nxh_l4f_fdc__entry__2">
<div class="- topic/div div">
<div class="- topic/div div">client：VE 设备</div>
</div>
</td></tr><tr class="- topic/row"><td class="- topic/entry entry colsep-1 rowsep-1" headers="id__table_nxh_l4f_fdc__entry__1">返回值</td><td class="- topic/entry entry colsep-0 rowsep-1" headers="id__table_nxh_l4f_fdc__entry__2">
<div class="- topic/div div">
<div class="- topic/div div"> 0：成功，其他：失败</div>
</div>
</td></tr><tr class="- topic/row"><td class="- topic/entry entry colsep-1 rowsep-0" headers="id__table_nxh_l4f_fdc__entry__1">注意事项</td><td class="- topic/entry entry colsep-0 rowsep-0" headers="id__table_nxh_l4f_fdc__entry__2">-</td></tr></tbody></table></div>
<div class="- topic/div div section" id="id__ioc-ve-get-client">
<strong class="+ topic/ph hi-d/b ph b"></strong>
<div class="table-container"><table class="- topic/table table frame-all" id="id__table_oxh_l4f_fdc" data-ofbid="id__table_oxh_l4f_fdc" data-cols="2"><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"> 3</span><span class="table--title-label-punctuation">. </span></span><span class="table--title">IOC_VE_GET_CLIENT</span></caption><colgroup><col style="width:16.666666666666664%"/><col style="width:83.33333333333334%"/></colgroup><thead class="- topic/thead thead"><tr class="- topic/row"><th class="- topic/entry entry colsep-1 rowsep-1" id="id__table_oxh_l4f_fdc__entry__1">函数原型</th><th class="- topic/entry entry colsep-0 rowsep-1" id="id__table_oxh_l4f_fdc__entry__2">int drv_ve_control(struct aic_ve_client *client, int cmd,
void *arg)</th></tr></thead><tbody class="- topic/tbody tbody"><tr class="- topic/row"><td class="- topic/entry entry colsep-1 rowsep-1" headers="id__table_oxh_l4f_fdc__entry__1">功能说明</td><td class="- topic/entry entry colsep-0 rowsep-1" headers="id__table_oxh_l4f_fdc__entry__2">获取 VE 设备独占权限</td></tr><tr class="- topic/row"><td class="- topic/entry entry colsep-1 rowsep-1" headers="id__table_oxh_l4f_fdc__entry__1">参数定义</td><td class="- topic/entry entry colsep-0 rowsep-1" headers="id__table_oxh_l4f_fdc__entry__2">
<div class="- topic/div div">
<div class="- topic/div div">client：VE 设备</div>
<div class="- topic/div div">cmd ：IOC_VE_GET_CLIENT</div>
<div class="- topic/div div">arg：NULL</div>
</div>
</td></tr><tr class="- topic/row"><td class="- topic/entry entry colsep-1 rowsep-1" headers="id__table_oxh_l4f_fdc__entry__1">返回值</td><td class="- topic/entry entry colsep-0 rowsep-1" headers="id__table_oxh_l4f_fdc__entry__2">
<div class="- topic/div div">
<div class="- topic/div div"> 0：成功，其他：失败</div>
</div>
</td></tr><tr class="- topic/row"><td class="- topic/entry entry colsep-1 rowsep-0" headers="id__table_oxh_l4f_fdc__entry__1">注意事项</td><td class="- topic/entry entry colsep-0 rowsep-0" headers="id__table_oxh_l4f_fdc__entry__2">- </td></tr></tbody></table></div><div class="table-container"><table class="- topic/table table frame-all" id="id__table_pxh_l4f_fdc" data-ofbid="id__table_pxh_l4f_fdc" data-cols="2"><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"> 4</span><span class="table--title-label-punctuation">. </span></span><span class="table--title">IOC_VE_PUT_CLIENT</span></caption><colgroup><col style="width:16.666666666666664%"/><col style="width:83.33333333333334%"/></colgroup><thead class="- topic/thead thead"><tr class="- topic/row"><th class="- topic/entry entry colsep-1 rowsep-1" id="id__table_pxh_l4f_fdc__entry__1">函数原型</th><th class="- topic/entry entry colsep-0 rowsep-1" id="id__table_pxh_l4f_fdc__entry__2">int drv_ve_control(struct aic_ve_client *client, int cmd,
void *arg)</th></tr></thead><tbody class="- topic/tbody tbody"><tr class="- topic/row"><td class="- topic/entry entry colsep-1 rowsep-1" headers="id__table_pxh_l4f_fdc__entry__1">功能说明</td><td class="- topic/entry entry colsep-0 rowsep-1" headers="id__table_pxh_l4f_fdc__entry__2">释放 VE 设备独占权限</td></tr><tr class="- topic/row"><td class="- topic/entry entry colsep-1 rowsep-1" headers="id__table_pxh_l4f_fdc__entry__1">参数定义</td><td class="- topic/entry entry colsep-0 rowsep-1" headers="id__table_pxh_l4f_fdc__entry__2">
<div class="- topic/div div">
<div class="- topic/div div">client：VE 设备</div>
<div class="- topic/div div">cmd：IOC_VE_PUT_CLIENT</div>
<div class="- topic/div div">arg：NULL</div>
</div>
</td></tr><tr class="- topic/row"><td class="- topic/entry entry colsep-1 rowsep-1" headers="id__table_pxh_l4f_fdc__entry__1">返回值</td><td class="- topic/entry entry colsep-0 rowsep-1" headers="id__table_pxh_l4f_fdc__entry__2">
<div class="- topic/div div">
<div class="- topic/div div"> 0：成功，其他：失败</div>
</div>
</td></tr><tr class="- topic/row"><td class="- topic/entry entry colsep-1 rowsep-0" headers="id__table_pxh_l4f_fdc__entry__1">注意事项</td><td class="- topic/entry entry colsep-0 rowsep-0" headers="id__table_pxh_l4f_fdc__entry__2">- </td></tr></tbody></table></div><div class="table-container"><table class="- topic/table table frame-all" id="id__table_qxh_l4f_fdc" data-ofbid="id__table_qxh_l4f_fdc" data-cols="2"><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"> 5</span><span class="table--title-label-punctuation">. </span></span><span class="table--title">IOC_VE_WAIT</span></caption><colgroup><col style="width:16.666666666666664%"/><col style="width:83.33333333333334%"/></colgroup><thead class="- topic/thead thead"><tr class="- topic/row"><th class="- topic/entry entry colsep-1 rowsep-1" id="id__table_qxh_l4f_fdc__entry__1">函数原型</th><th class="- topic/entry entry colsep-0 rowsep-1" id="id__table_qxh_l4f_fdc__entry__2">int drv_ve_control(struct aic_ve_client *client, int cmd,
void *arg)</th></tr></thead><tbody class="- topic/tbody tbody"><tr class="- topic/row"><td class="- topic/entry entry colsep-1 rowsep-1" headers="id__table_qxh_l4f_fdc__entry__1">功能说明</td><td class="- topic/entry entry colsep-0 rowsep-1" headers="id__table_qxh_l4f_fdc__entry__2">等待 VE 驱动编解码完成，并且获取 VE 寄存器状态</td></tr><tr class="- topic/row"><td class="- topic/entry entry colsep-1 rowsep-1" headers="id__table_qxh_l4f_fdc__entry__1">参数定义</td><td class="- topic/entry entry colsep-0 rowsep-1" headers="id__table_qxh_l4f_fdc__entry__2">
<div class="- topic/div div">
<div class="- topic/div div"> client：drv_ve_open 返回的 VE 硬件实例</div>
<div class="- topic/div div">cmd：IOC_VE_WAIT</div>
<div class="- topic/div div">arg：指向 struct wait_info 指针</div>
</div>
</td></tr><tr class="- topic/row"><td class="- topic/entry entry colsep-1 rowsep-1" headers="id__table_qxh_l4f_fdc__entry__1">返回值</td><td class="- topic/entry entry colsep-0 rowsep-1" headers="id__table_qxh_l4f_fdc__entry__2">
<div class="- topic/div div">
<div class="- topic/div div"> 0：成功，其他：失败</div>
</div>
</td></tr><tr class="- topic/row"><td class="- topic/entry entry colsep-1 rowsep-0" headers="id__table_qxh_l4f_fdc__entry__1">注意事项</td><td class="- topic/entry entry colsep-0 rowsep-0" headers="id__table_qxh_l4f_fdc__entry__2">- </td></tr></tbody></table></div><div class="table-container"><table class="- topic/table table frame-all" id="id__table_rxh_l4f_fdc" data-ofbid="id__table_rxh_l4f_fdc" data-cols="2"><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"> 6</span><span class="table--title-label-punctuation">. </span></span><span class="table--title">IOC_VE_RESET</span></caption><colgroup><col style="width:16.666666666666664%"/><col style="width:83.33333333333334%"/></colgroup><thead class="- topic/thead thead"><tr class="- topic/row"><th class="- topic/entry entry colsep-1 rowsep-1" id="id__table_rxh_l4f_fdc__entry__1">函数原型</th><th class="- topic/entry entry colsep-0 rowsep-1" id="id__table_rxh_l4f_fdc__entry__2">int drv_ve_control(struct aic_ve_client *client, int cmd,
void *arg)</th></tr></thead><tbody class="- topic/tbody tbody"><tr class="- topic/row"><td class="- topic/entry entry colsep-1 rowsep-1" headers="id__table_rxh_l4f_fdc__entry__1">功能说明</td><td class="- topic/entry entry colsep-0 rowsep-1" headers="id__table_rxh_l4f_fdc__entry__2">VE 驱动硬件复位</td></tr><tr class="- topic/row"><td class="- topic/entry entry colsep-1 rowsep-1" headers="id__table_rxh_l4f_fdc__entry__1">参数定义</td><td class="- topic/entry entry colsep-0 rowsep-1" headers="id__table_rxh_l4f_fdc__entry__2">
<div class="- topic/div div">
<div class="- topic/div div">client：VE 设备</div>
<div class="- topic/div div">cmd：IOC_VE_RESET</div>
<div class="- topic/div div">arg：NULL</div>
</div>
</td></tr><tr class="- topic/row"><td class="- topic/entry entry colsep-1 rowsep-1" headers="id__table_rxh_l4f_fdc__entry__1">返回值</td><td class="- topic/entry entry colsep-0 rowsep-1" headers="id__table_rxh_l4f_fdc__entry__2">
<div class="- topic/div div">
<div class="- topic/div div"> 0：成功，其他：失败</div>
</div>
</td></tr><tr class="- topic/row"><td class="- topic/entry entry colsep-1 rowsep-0" headers="id__table_rxh_l4f_fdc__entry__1">注意事项</td><td class="- topic/entry entry colsep-0 rowsep-0" headers="id__table_rxh_l4f_fdc__entry__2">-</td></tr></tbody></table></div>
</div>
<div class="- topic/div div section" id="id__app-demo">
<strong class="+ topic/ph hi-d/b ph b">APP Demo 参考</strong>
<p class="- topic/p p" data-ofbid="d88088e537__20250121171530">以下 demo 实现 VE 驱动基本调用流程，具体可参考 mpp
代码（<span class="+ topic/ph sw-d/filepath ph filepath">packages/artinchip/mpp/ve/common/ve.c</span>）</p><pre class="+ topic/pre pr-d/codeblock pre codeblock language-c" id="id__codeblock_sxh_l4f_fdc" data-ofbid="id__codeblock_sxh_l4f_fdc"> <em class="hl-comment">//* 1. 打开 VE</em>
<strong class="hl-keyword">struct</strong> aic_ve_client* client = drv_ve_open();
<em class="hl-comment">//* 2. 获取 VE 权限</em>
ioctl(client, IOC_VE_GET_CLIENT，NULL);
<em class="hl-comment">//* 3. 配置寄存器（省略）</em>
...
<em class="hl-comment">//* 4. 等 VE 中断</em>
<strong class="hl-keyword">struct</strong> wait_info wt_info;
wt_info.wait_time = VE_TIMEOUT;
<strong class="hl-keyword">int</strong> ret = drv_ve_control(client, IOC_VE_WAIT, &amp;wt_info);
<strong class="hl-keyword">if</strong>(ret &lt; <span class="hl-number">0</span>) {
<em class="hl-comment">// 中断超时,VE 硬件复位</em>
drv_ve_control(client, IOC_VE_RESET,NULL);
}
<em class="hl-comment">//* 5. 释放 VE 权限</em>
drv_ve_control(client, IOC_VE_PUT_CLIENT,NULL);
<em class="hl-comment">//* 6. 关闭 VE</em>
drv_ve_close(client);
</pre>
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