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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/mpp/mpp_encoder_design.dita">Edit online</a></span><h1 class="- topic/title title topictitle1" id="ariaid-title1">MPP Encoder 设计及接口说明</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 concept/conbody body conbody"><p class="- topic/p p" data-ofbid="d109870e24__20250121171548"> MPP Encoder 目前只支持 JPEG 图片编码。接口设计如下：</p><div class="table-container"><table class="- topic/table table frame-all" id="mpp_encoder_design_and_interface_intro__table_sch_dwh_d1c" data-ofbid="mpp_encoder_design_and_interface_intro__table_sch_dwh_d1c" 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">mpp_encode_jpeg</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="mpp_encoder_design_and_interface_intro__table_sch_dwh_d1c__entry__1">函数原型</th><th class="- topic/entry entry colsep-0 rowsep-1" id="mpp_encoder_design_and_interface_intro__table_sch_dwh_d1c__entry__2">int mpp_encode_jpeg(struct mpp_frame* frame, int quality, int
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dma_buf_fd, int buf_len, int* len)</th></tr></thead><tbody class="- topic/tbody tbody"><tr class="- topic/row"><td class="- topic/entry entry colsep-1 rowsep-1" headers="mpp_encoder_design_and_interface_intro__table_sch_dwh_d1c__entry__1">功能说明</td><td class="- topic/entry entry colsep-0 rowsep-1" headers="mpp_encoder_design_and_interface_intro__table_sch_dwh_d1c__entry__2">编码一帧 JPEG 图片</td></tr><tr class="- topic/row"><td class="- topic/entry entry colsep-1 rowsep-1" headers="mpp_encoder_design_and_interface_intro__table_sch_dwh_d1c__entry__1">参数定义</td><td class="- topic/entry entry colsep-0 rowsep-1" headers="mpp_encoder_design_and_interface_intro__table_sch_dwh_d1c__entry__2">
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<ul class="- topic/ul ul" id="mpp_encoder_design_and_interface_intro__ul_kb4_fwh_d1c" data-ofbid="mpp_encoder_design_and_interface_intro__ul_kb4_fwh_d1c"><li class="- topic/li li" data-ofbid="d109870e50__20250121171548">frame: 待编码的原始 YUV 数据</li><li class="- topic/li li" data-ofbid="d109870e52__20250121171548">quality: 编码质量，取值范围 1~100，1 表示编码图片质量最差，100 表示最好</li><li class="- topic/li li" data-ofbid="d109870e54__20250121171548">dma_buf_fd：输出 JPEG 图片存放的 dma-buf fd </li><li class="- topic/li li" data-ofbid="d109870e56__20250121171548">buf_len：输出 JPEG 图片 buf 的长度 </li><li class="- topic/li li" data-ofbid="d109870e58__20250121171548">len: 输出 JPEG 图片的真实大小</li></ul>
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</td></tr><tr class="- topic/row"><td class="- topic/entry entry colsep-1 rowsep-1" headers="mpp_encoder_design_and_interface_intro__table_sch_dwh_d1c__entry__1">返回值</td><td class="- topic/entry entry colsep-0 rowsep-1" headers="mpp_encoder_design_and_interface_intro__table_sch_dwh_d1c__entry__2">0: 成功<p class="- topic/p p" data-ofbid="d109870e66__20250121171548"><0:失败</p></td></tr><tr class="- topic/row"><td class="- topic/entry entry colsep-1 rowsep-0" headers="mpp_encoder_design_and_interface_intro__table_sch_dwh_d1c__entry__1">注意事项</td><td class="- topic/entry entry colsep-0 rowsep-0" headers="mpp_encoder_design_and_interface_intro__table_sch_dwh_d1c__entry__2">-</td></tr></tbody></table></div><div class="- topic/note note tip note_tip" id="mpp_encoder_design_and_interface_intro__note_ykh_hwh_d1c" data-ofbid="mpp_encoder_design_and_interface_intro__note_ykh_hwh_d1c"><span class="note__title">提示：</span> 输出 JPEG 图片的缓存 buffer 由调用者申请，但调用者并不知道编码后图片的实际大小， 为避免
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VE 写输出数据时越界，该 buffer 需要预先申请较大的内存。</div><section class="- topic/section section" id="mpp_encoder_design_and_interface_intro__section_qfn_3wh_d1c" data-ofbid="mpp_encoder_design_and_interface_intro__section_qfn_3wh_d1c"><h2 class="- topic/title title sectiontitle">MPP Decoder 参考 demo</h2>
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<p class="- topic/p p" data-ofbid="d109870e80__20250121171548">以下 demo 为基本流程调用，具体实现可以参考代码 <span class="+ topic/ph sw-d/filepath ph filepath">mpp/mpp_test/jpeg_encoder_test.c</span></p>
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<pre class="+ topic/pre pr-d/codeblock pre codeblock language-c" id="mpp_encoder_design_and_interface_intro__pre_rfn_3wh_d1c" data-ofbid="mpp_encoder_design_and_interface_intro__pre_rfn_3wh_d1c"><em class="hl-comment">//* 1. 获取 dma-buf device 句柄</em>
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<strong class="hl-keyword">int</strong> dma_fd = dmabuf_device_open();
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<em class="hl-comment">//* 2. 设置输入 YUV 数据结构体</em>
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<strong class="hl-keyword">struct</strong> mpp_frame frame;
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<em class="hl-comment">// ....</em>
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<em class="hl-comment">//* 3. 申请编码输出 buffer</em>
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<strong class="hl-keyword">int</strong> len = <span class="hl-number">0</span>;
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<strong class="hl-keyword">int</strong> buf_len = width * height * <span class="hl-number">4</span>/<span class="hl-number">5</span> * quality / <span class="hl-number">100</span>;
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<strong class="hl-keyword">int</strong> jpeg_data_fd = dmabuf_alloc(dma_fd, buf_len);
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<em class="hl-comment">//* 4. 编码 JPEG 图片</em>
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mpp_encode_jpeg(&frame, quality, jpeg_data_fd, buf_len, &len)。
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<em class="hl-comment">//* 5. 保存编码后 JPEG 图片</em>
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<strong class="hl-keyword">unsigned</strong> <strong class="hl-keyword">char</strong>* jpeg_vir_addr = dmabuf_mmap(jpeg_data_fd, buf_len);
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FILE* fp_save = fopen(<span class="hl-string">"/save.jpg"</span>, <span class="hl-string">"wb"</span>);
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fwrite(jpeg_vir_addr, <span class="hl-number">1</span>, len, fp_save);
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fclose(fp_save);
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<em class="hl-comment">//* 6. 释放资源</em>
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dmabuf_munmap(jpeg_vir_addr, buf_len);
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dmabuf_free(jpeg_data_fd);
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dmabuf_device_close(dma_fd);</pre>
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