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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" title="Edit this document" href="http://172.16.35.88/tasks/jdssno1uvvbf2mltu9kb9v3if05d5gopuakboe8hlud18rma/edit/F:/aicdita/aicdita-cn/topics/sdk/dvp/dvp_interface.dita">Edit online</a></span><h1 class="- topic/title title topictitle1" id="ariaid-title1">接口设计</h1>
<div class="date inPage">15 Jan 2024</div><div style="color: gray;">
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<div class="- topic/body concept/conbody body conbody">
<section class="- topic/section section" id="dvp_interface_design__section_ccl_zch_d1c" data-ofbid="dvp_interface_design__section_ccl_zch_d1c"><h2 class="- topic/title title sectiontitle">ioctl 接口</h2>
<p class="- topic/p p" data-ofbid="d62488e38__20250123155203">用户态通过 /dev/videoX 节点的 ioctl() 接口与内核态 V4L2 框架、DVP 驱动进行交互。主要功能有：</p>
<ul class="- topic/ul ul" id="dvp_interface_design__ul_dcl_zch_d1c" data-ofbid="dvp_interface_design__ul_dcl_zch_d1c">
<li class="- topic/li li" data-ofbid="d62488e43__20250123155203">
<p class="- topic/p p" data-ofbid="d62488e45__20250123155203">获取、设置格式</p>
</li>
<li class="- topic/li li" data-ofbid="d62488e49__20250123155203">
<p class="- topic/p p" data-ofbid="d62488e51__20250123155203">申请、释放 Buf</p>
</li>
<li class="- topic/li li" data-ofbid="d62488e55__20250123155203">
<p class="- topic/p p" data-ofbid="d62488e57__20250123155203">QBuf、DQBuf</p>
</li>
<li class="- topic/li li" data-ofbid="d62488e61__20250123155203">
<p class="- topic/p p" data-ofbid="d62488e63__20250123155203">导出 dma-buf 文件描述符</p>
</li>
<li class="- topic/li li" data-ofbid="d62488e67__20250123155203">
<p class="- topic/p p" data-ofbid="d62488e69__20250123155203">启动、停止 Stream</p>
</li>
</ul>
<div class="- topic/p p" data-ofbid="d62488e74__20250123155203">定义在<span class="+ topic/ph sw-d/filepath ph filepath">include/uapi/linux/videodev2.h</span>：<pre class="+ topic/pre pr-d/codeblock pre codeblock language-c" id="dvp_interface_design__codeblock_yzc_rdh_d1c" data-ofbid="dvp_interface_design__codeblock_yzc_rdh_d1c"><code>#<span class="hl-directive">define</span> VIDIOC_QUERYCAP _IOR(<span class="hl-string">'V'</span>, <span class="hl-number">0</span>, <strong class="hl-keyword">struct</strong> v4l2_capability)
#<span class="hl-directive">define</span> VIDIOC_ENUM_FMT _IOWR(<span class="hl-string">'V'</span>, <span class="hl-number">2</span>, <strong class="hl-keyword">struct</strong> v4l2_fmtdesc)
#<span class="hl-directive">define</span> VIDIOC_G_FMT _IOWR(<span class="hl-string">'V'</span>, <span class="hl-number">4</span>, <strong class="hl-keyword">struct</strong> v4l2_format)
#<span class="hl-directive">define</span> VIDIOC_S_FMT _IOWR(<span class="hl-string">'V'</span>, <span class="hl-number">5</span>, <strong class="hl-keyword">struct</strong> v4l2_format)
#<span class="hl-directive">define</span> VIDIOC_REQBUFS _IOWR(<span class="hl-string">'V'</span>, <span class="hl-number">8</span>, <strong class="hl-keyword">struct</strong> v4l2_requestbuffers)
#<span class="hl-directive">define</span> VIDIOC_QUERYBUF _IOWR(<span class="hl-string">'V'</span>, <span class="hl-number">9</span>, <strong class="hl-keyword">struct</strong> v4l2_buffer)
#<span class="hl-directive">define</span> VIDIOC_G_FBUF _IOR(<span class="hl-string">'V'</span>, <span class="hl-number">10</span>, <strong class="hl-keyword">struct</strong> v4l2_framebuffer)
#<span class="hl-directive">define</span> VIDIOC_S_FBUF _IOW(<span class="hl-string">'V'</span>, <span class="hl-number">11</span>, <strong class="hl-keyword">struct</strong> v4l2_framebuffer)
#<span class="hl-directive">define</span> VIDIOC_OVERLAY _IOW(<span class="hl-string">'V'</span>, <span class="hl-number">14</span>, <strong class="hl-keyword">int</strong>)
#<span class="hl-directive">define</span> VIDIOC_QBUF _IOWR(<span class="hl-string">'V'</span>, <span class="hl-number">15</span>, <strong class="hl-keyword">struct</strong> v4l2_buffer)
#<span class="hl-directive">define</span> VIDIOC_EXPBUF _IOWR(<span class="hl-string">'V'</span>, <span class="hl-number">16</span>, <strong class="hl-keyword">struct</strong> v4l2_exportbuffer)
#<span class="hl-directive">define</span> VIDIOC_DQBUF _IOWR(<span class="hl-string">'V'</span>, <span class="hl-number">17</span>, <strong class="hl-keyword">struct</strong> v4l2_buffer)
#<span class="hl-directive">define</span> VIDIOC_STREAMON _IOW(<span class="hl-string">'V'</span>, <span class="hl-number">18</span>, <strong class="hl-keyword">int</strong>)
#<span class="hl-directive">define</span> VIDIOC_STREAMOFF _IOW(<span class="hl-string">'V'</span>, <span class="hl-number">19</span>, <strong class="hl-keyword">int</strong>)
#<span class="hl-directive">define</span> VIDIOC_G_PARM _IOWR(<span class="hl-string">'V'</span>, <span class="hl-number">21</span>, <strong class="hl-keyword">struct</strong> v4l2_streamparm)
#<span class="hl-directive">define</span> VIDIOC_S_PARM _IOWR(<span class="hl-string">'V'</span>, <span class="hl-number">22</span>, <strong class="hl-keyword">struct</strong> v4l2_streamparm)
#<span class="hl-directive">define</span> VIDIOC_G_STD _IOR(<span class="hl-string">'V'</span>, <span class="hl-number">23</span>, v4l2_std_id)
#<span class="hl-directive">define</span> VIDIOC_S_STD _IOW(<span class="hl-string">'V'</span>, <span class="hl-number">24</span>, v4l2_std_id)
#<span class="hl-directive">define</span> VIDIOC_ENUMSTD _IOWR(<span class="hl-string">'V'</span>, <span class="hl-number">25</span>, <strong class="hl-keyword">struct</strong> v4l2_standard)
#<span class="hl-directive">define</span> VIDIOC_ENUMINPUT _IOWR(<span class="hl-string">'V'</span>, <span class="hl-number">26</span>, <strong class="hl-keyword">struct</strong> v4l2_input)
#<span class="hl-directive">define</span> VIDIOC_G_CTRL _IOWR(<span class="hl-string">'V'</span>, <span class="hl-number">27</span>, <strong class="hl-keyword">struct</strong> v4l2_control)
#<span class="hl-directive">define</span> VIDIOC_S_CTRL _IOWR(<span class="hl-string">'V'</span>, <span class="hl-number">28</span>, <strong class="hl-keyword">struct</strong> v4l2_control)
#<span class="hl-directive">define</span> VIDIOC_QUERYCTRL _IOWR(<span class="hl-string">'V'</span>, <span class="hl-number">36</span>, <strong class="hl-keyword">struct</strong> v4l2_queryctrl)
#<span class="hl-directive">define</span> VIDIOC_QUERYMENU _IOWR(<span class="hl-string">'V'</span>, <span class="hl-number">37</span>, <strong class="hl-keyword">struct</strong> v4l2_querymenu)
#<span class="hl-directive">define</span> VIDIOC_G_INPUT _IOR(<span class="hl-string">'V'</span>, <span class="hl-number">38</span>, <strong class="hl-keyword">int</strong>)
#<span class="hl-directive">define</span> VIDIOC_S_INPUT _IOWR(<span class="hl-string">'V'</span>, <span class="hl-number">39</span>, <strong class="hl-keyword">int</strong>)
#<span class="hl-directive">define</span> VIDIOC_G_OUTPUT _IOR(<span class="hl-string">'V'</span>, <span class="hl-number">46</span>, <strong class="hl-keyword">int</strong>)
#<span class="hl-directive">define</span> VIDIOC_S_OUTPUT _IOWR(<span class="hl-string">'V'</span>, <span class="hl-number">47</span>, <strong class="hl-keyword">int</strong>)
#<span class="hl-directive">define</span> VIDIOC_ENUMOUTPUT _IOWR(<span class="hl-string">'V'</span>, <span class="hl-number">48</span>, <strong class="hl-keyword">struct</strong> v4l2_output)
#<span class="hl-directive">define</span> VIDIOC_G_FREQUENCY _IOWR(<span class="hl-string">'V'</span>, <span class="hl-number">56</span>, <strong class="hl-keyword">struct</strong> v4l2_frequency)
#<span class="hl-directive">define</span> VIDIOC_S_FREQUENCY _IOW(<span class="hl-string">'V'</span>, <span class="hl-number">57</span>, <strong class="hl-keyword">struct</strong> v4l2_frequency)
#<span class="hl-directive">define</span> VIDIOC_CROPCAP _IOWR(<span class="hl-string">'V'</span>, <span class="hl-number">58</span>, <strong class="hl-keyword">struct</strong> v4l2_cropcap)
#<span class="hl-directive">define</span> VIDIOC_G_CROP _IOWR(<span class="hl-string">'V'</span>, <span class="hl-number">59</span>, <strong class="hl-keyword">struct</strong> v4l2_crop)
#<span class="hl-directive">define</span> VIDIOC_S_CROP _IOW(<span class="hl-string">'V'</span>, <span class="hl-number">60</span>, <strong class="hl-keyword">struct</strong> v4l2_crop)
#<span class="hl-directive">define</span> VIDIOC_G_JPEGCOMP _IOR(<span class="hl-string">'V'</span>, <span class="hl-number">61</span>, <strong class="hl-keyword">struct</strong> v4l2_jpegcompression)
#<span class="hl-directive">define</span> VIDIOC_S_JPEGCOMP _IOW(<span class="hl-string">'V'</span>, <span class="hl-number">62</span>, <strong class="hl-keyword">struct</strong> v4l2_jpegcompression)
#<span class="hl-directive">define</span> VIDIOC_QUERYSTD _IOR(<span class="hl-string">'V'</span>, <span class="hl-number">63</span>, v4l2_std_id)
#<span class="hl-directive">define</span> VIDIOC_TRY_FMT _IOWR(<span class="hl-string">'V'</span>, <span class="hl-number">64</span>, <strong class="hl-keyword">struct</strong> v4l2_format)
#<span class="hl-directive">define</span> VIDIOC_G_PRIORITY _IOR(<span class="hl-string">'V'</span>, <span class="hl-number">67</span>, __u32) <em class="hl-comment">/* enum v4l2_priority */</em>
#<span class="hl-directive">define</span> VIDIOC_S_PRIORITY _IOW(<span class="hl-string">'V'</span>, <span class="hl-number">68</span>, __u32) <em class="hl-comment">/* enum v4l2_priority */</em>
#<span class="hl-directive">define</span> VIDIOC_G_SLICED_VBI_CAP _IOWR(<span class="hl-string">'V'</span>, <span class="hl-number">69</span>, <strong class="hl-keyword">struct</strong> v4l2_sliced_vbi_cap)
#<span class="hl-directive">define</span> VIDIOC_LOG_STATUS _IO(<span class="hl-string">'V'</span>, <span class="hl-number">70</span>)
#<span class="hl-directive">define</span> VIDIOC_G_EXT_CTRLS _IOWR(<span class="hl-string">'V'</span>, <span class="hl-number">71</span>, <strong class="hl-keyword">struct</strong> v4l2_ext_controls)
#<span class="hl-directive">define</span> VIDIOC_S_EXT_CTRLS _IOWR(<span class="hl-string">'V'</span>, <span class="hl-number">72</span>, <strong class="hl-keyword">struct</strong> v4l2_ext_controls)
#<span class="hl-directive">define</span> VIDIOC_TRY_EXT_CTRLS _IOWR(<span class="hl-string">'V'</span>, <span class="hl-number">73</span>, <strong class="hl-keyword">struct</strong> v4l2_ext_controls)
#<span class="hl-directive">define</span> VIDIOC_ENUM_FRAMESIZES _IOWR(<span class="hl-string">'V'</span>, <span class="hl-number">74</span>, <strong class="hl-keyword">struct</strong> v4l2_frmsizeenum)
#<span class="hl-directive">define</span> VIDIOC_ENUM_FRAMEINTERVALS _IOWR(<span class="hl-string">'V'</span>, <span class="hl-number">75</span>, <strong class="hl-keyword">struct</strong> v4l2_frmivalenum)
#<span class="hl-directive">define</span> VIDIOC_G_ENC_INDEX _IOR(<span class="hl-string">'V'</span>, <span class="hl-number">76</span>, <strong class="hl-keyword">struct</strong> v4l2_enc_idx)
#<span class="hl-directive">define</span> VIDIOC_ENCODER_CMD _IOWR(<span class="hl-string">'V'</span>, <span class="hl-number">77</span>, <strong class="hl-keyword">struct</strong> v4l2_encoder_cmd)
#<span class="hl-directive">define</span> VIDIOC_TRY_ENCODER_CMD _IOWR(<span class="hl-string">'V'</span>, <span class="hl-number">78</span>, <strong class="hl-keyword">struct</strong> v4l2_encoder_cmd)</code></pre></div>
</section>
<section class="- topic/section section" id="dvp_interface_design__section_fcl_zch_d1c" data-ofbid="dvp_interface_design__section_fcl_zch_d1c"><h2 class="- topic/title title sectiontitle">V4l2 subdev 的外部接口</h2>
<div class="- topic/p p" data-ofbid="d62488e88__20250123155203">用户态通过/dev/v4l-subdevX 节点的 ioctl()接口与内核态 V4L2 框架、DVP 驱动、Sensor 驱动进行交互。主要功能有：<ul class="- topic/ul ul" id="dvp_interface_design__ul_gcl_zch_d1c" data-ofbid="dvp_interface_design__ul_gcl_zch_d1c">
<li class="- topic/li li" data-ofbid="d62488e92__20250123155203">
<p class="- topic/p p" data-ofbid="d62488e94__20250123155203">获取、设置格式</p>
</li>
<li class="- topic/li li" data-ofbid="d62488e98__20250123155203">
<p class="- topic/p p" data-ofbid="d62488e100__20250123155203">获取、设置帧间隔</p>
</li>
<li class="- topic/li li" data-ofbid="d62488e104__20250123155203">
<p class="- topic/p p" data-ofbid="d62488e106__20250123155203">枚举支持的 MBUS 类型</p>
</li>
<li class="- topic/li li" data-ofbid="d62488e110__20250123155203">
<p class="- topic/p p" data-ofbid="d62488e112__20250123155203">枚举支持的分辨率</p>
</li>
<li class="- topic/li li" data-ofbid="d62488e116__20250123155203">
<p class="- topic/p p" data-ofbid="d62488e118__20250123155203">获取、设置区域裁剪</p>
</li>
</ul></div>
<div class="- topic/p p" data-ofbid="d62488e123__20250123155203">定义在
<span class="+ topic/ph sw-d/filepath ph filepath">include/uapi/linux/v4l2-subdev.h</span>：<pre class="+ topic/pre pr-d/codeblock pre codeblock language-c" id="dvp_interface_design__codeblock_srn_sdh_d1c" data-ofbid="dvp_interface_design__codeblock_srn_sdh_d1c"><code>#<span class="hl-directive">define</span> VIDIOC_SUBDEV_G_FMT _IOWR(<span class="hl-string">'V'</span>, <span class="hl-number">4</span>, <strong class="hl-keyword">struct</strong> v4l2_subdev_format)
#<span class="hl-directive">define</span> VIDIOC_SUBDEV_S_FMT _IOWR(<span class="hl-string">'V'</span>, <span class="hl-number">5</span>, <strong class="hl-keyword">struct</strong> v4l2_subdev_format)
#<span class="hl-directive">define</span> VIDIOC_SUBDEV_G_FRAME_INTERVAL _IOWR(<span class="hl-string">'V'</span>, <span class="hl-number">21</span>, <strong class="hl-keyword">struct</strong> v4l2_subdev_frame_interval)
#<span class="hl-directive">define</span> VIDIOC_SUBDEV_S_FRAME_INTERVAL _IOWR(<span class="hl-string">'V'</span>, <span class="hl-number">22</span>, <strong class="hl-keyword">struct</strong> v4l2_subdev_frame_interval)
#<span class="hl-directive">define</span> VIDIOC_SUBDEV_ENUM_MBUS_CODE _IOWR(<span class="hl-string">'V'</span>, <span class="hl-number">2</span>, <strong class="hl-keyword">struct</strong> v4l2_subdev_mbus_code_enum)
#<span class="hl-directive">define</span> VIDIOC_SUBDEV_ENUM_FRAME_SIZE _IOWR(<span class="hl-string">'V'</span>, <span class="hl-number">74</span>, <strong class="hl-keyword">struct</strong> v4l2_subdev_frame_size_enum)
#<span class="hl-directive">define</span> VIDIOC_SUBDEV_ENUM_FRAME_INTERVAL _IOWR(<span class="hl-string">'V'</span>, <span class="hl-number">75</span>, <strong class="hl-keyword">struct</strong> v4l2_subdev_frame_interval_enum)
#<span class="hl-directive">define</span> VIDIOC_SUBDEV_G_CROP _IOWR(<span class="hl-string">'V'</span>, <span class="hl-number">59</span>, <strong class="hl-keyword">struct</strong> v4l2_subdev_crop)
#<span class="hl-directive">define</span> VIDIOC_SUBDEV_S_CROP _IOWR(<span class="hl-string">'V'</span>, <span class="hl-number">60</span>, <strong class="hl-keyword">struct</strong> v4l2_subdev_crop)
#<span class="hl-directive">define</span> VIDIOC_SUBDEV_G_SELECTION _IOWR(<span class="hl-string">'V'</span>, <span class="hl-number">61</span>, <strong class="hl-keyword">struct</strong> v4l2_subdev_selection)
#<span class="hl-directive">define</span> VIDIOC_SUBDEV_S_SELECTION _IOWR(<span class="hl-string">'V'</span>, <span class="hl-number">62</span>, <strong class="hl-keyword">struct</strong> v4l2_subdev_selection)
<em class="hl-comment">/* The following ioctls are identical to the ioctls in videodev2.h */</em>
#<span class="hl-directive">define</span> VIDIOC_SUBDEV_G_STD _IOR(<span class="hl-string">'V'</span>, <span class="hl-number">23</span>, v4l2_std_id)
#<span class="hl-directive">define</span> VIDIOC_SUBDEV_S_STD _IOW(<span class="hl-string">'V'</span>, <span class="hl-number">24</span>, v4l2_std_id)
#<span class="hl-directive">define</span> VIDIOC_SUBDEV_ENUMSTD _IOWR(<span class="hl-string">'V'</span>, <span class="hl-number">25</span>, <strong class="hl-keyword">struct</strong> v4l2_standard)
#<span class="hl-directive">define</span> VIDIOC_SUBDEV_G_EDID _IOWR(<span class="hl-string">'V'</span>, <span class="hl-number">40</span>, <strong class="hl-keyword">struct</strong> v4l2_edid)
#<span class="hl-directive">define</span> VIDIOC_SUBDEV_S_EDID _IOWR(<span class="hl-string">'V'</span>, <span class="hl-number">41</span>, <strong class="hl-keyword">struct</strong> v4l2_edid)
#<span class="hl-directive">define</span> VIDIOC_SUBDEV_QUERYSTD _IOR(<span class="hl-string">'V'</span>, <span class="hl-number">63</span>, v4l2_std_id)
#<span class="hl-directive">define</span> VIDIOC_SUBDEV_S_DV_TIMINGS _IOWR(<span class="hl-string">'V'</span>, <span class="hl-number">87</span>, <strong class="hl-keyword">struct</strong> v4l2_dv_timings)
#<span class="hl-directive">define</span> VIDIOC_SUBDEV_G_DV_TIMINGS _IOWR(<span class="hl-string">'V'</span>, <span class="hl-number">88</span>, <strong class="hl-keyword">struct</strong> v4l2_dv_timings)
#<span class="hl-directive">define</span> VIDIOC_SUBDEV_ENUM_DV_TIMINGS _IOWR(<span class="hl-string">'V'</span>, <span class="hl-number">98</span>, <strong class="hl-keyword">struct</strong> v4l2_enum_dv_timings)
#<span class="hl-directive">define</span> VIDIOC_SUBDEV_QUERY_DV_TIMINGS _IOR(<span class="hl-string">'V'</span>, <span class="hl-number">99</span>, <strong class="hl-keyword">struct</strong> v4l2_dv_timings)
#<span class="hl-directive">define</span> VIDIOC_SUBDEV_DV_TIMINGS_CAP _IOWR(<span class="hl-string">'V'</span>, <span class="hl-number">100</span>, <strong class="hl-keyword">struct</strong> v4l2_dv_timings_cap)</code></pre></div>
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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="#dvp_interface_design__section_ccl_zch_d1c" data-tocid="dvp_interface_design__section_ccl_zch_d1c">ioctl 接口</a></div></li><li class="section-item"><div class="section-title"><a href="#dvp_interface_design__section_fcl_zch_d1c" data-tocid="dvp_interface_design__section_fcl_zch_d1c">V4l2 subdev 的外部接口</a></div></li></ul></div>
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