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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_player_design.dita">Edit online</a></span><h1 class="- topic/title title topictitle1" id="ariaid-title1">设计说明</h1><div class="date inPage">2 Dec 2024</div><div style="color: gray;">
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Read time: 2 minute(s)
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</div><div class="- topic/body concept/conbody body conbody"><div class="- topic/p p" data-ofbid="d29579e22__20250121171504">本模块源码位于 <span class="+ topic/ph sw-d/filepath ph filepath">source/artinchip/aic-mpp/middle_media</span>
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，目录结构如下<pre class="+ topic/pre pr-d/codeblock pre codeblock language-c" id="mpp_player_design_intro__codeblock_lym_hb3_d1c" data-ofbid="mpp_player_design_intro__codeblock_lym_hb3_d1c">aic-mpp
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|--middle-media
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|-base
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| |-inlcude
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| | |-aic_message.h <em class="hl-comment">//定义公共消息接口</em>
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| | |-aic_parser.h <em class="hl-comment">//定义 parser 接口</em>
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| | |-aic_stream.h <em class="hl-comment">//定义 stream 接口</em>
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| | |-aic_render.h <em class="hl-comment">//定义视频渲染接口</em>
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| | |-aic_audio_render.h <em class="hl-comment">//定义音频渲染接口</em>
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| |
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| |-message <em class="hl-comment">//消息接口具体实现</em>
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| |-parser <em class="hl-comment">//parser 接口具体实现</em>
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| |-stream <em class="hl-comment">//stream 接口具体实现</em>
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| |-render <em class="hl-comment">//音视频渲染接口具体实现</em>
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|-audio_decoder <em class="hl-comment">//音频软件解码器，无硬件音频解码器。</em>
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|-openmax <em class="hl-comment">//播放器组件</em>
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| |-component
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| | |-OMX_AdecComponent.c <em class="hl-comment">//音频解码组件,输入编码音频数据,输出解码后的 pcm 数据</em>
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| | |-OMX_AudioRenderComponent.c <em class="hl-comment">//音频渲染组件，将解码后音频送到音频设备播放</em>
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| | |-OMX_ClockComponent.c <em class="hl-comment">//时钟组件，为音视频同步服务</em>
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| | |-OMX_DemuxerComponent.c <em class="hl-comment">//解封装组件,识别文件的封装格式,从文件中解析出音视频 packet</em>
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| | |-OMX_VdecComponent.c <em class="hl-comment">//视频解码组件，输入编码视频数据，输出解码后的视频图像</em>
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| | |-OMX_VideoRenderComponent.c <em class="hl-comment">//视频渲染组件，将解码后图像显示在屏幕上</em>
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| |
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| |-inlcude
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| |-*.h <em class="hl-comment">//openmax 头文件</em>
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|-player
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|-inlcude
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| |-aic_player.h <em class="hl-comment">//palyer 接口定义</em>
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|aic_player.c <em class="hl-comment">//player 接口实现</em></pre><ul class="- topic/ul ul simple" id="mpp_player_design_intro__ul_fjz_trf_fdc" data-ofbid="mpp_player_design_intro__ul_fjz_trf_fdc"><li class="- topic/li li" data-ofbid="d29579e30__20250121171504">
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<p class="- topic/p p" data-ofbid="d29579e32__20250121171504"> component 相比 V1 版本播放器删除 OMX 的 component 设计，变更为自研的 mm_component
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框架，内容更加精简。</p>
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</li><li class="- topic/li li" data-ofbid="d29579e35__20250121171504">
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<p class="- topic/p p" data-ofbid="d29579e37__20250121171504">为了避免整体框架调整过大，该框架部分 API 仍然借鉴了部分 OMX 的思想，使得各组件间调用的接口更加统一和规范。</p>
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</li></ul></div><section class="- topic/section section" id="mpp_player_design_intro__section_gq4_jb3_d1c" data-ofbid="mpp_player_design_intro__section_gq4_jb3_d1c"><h2 class="- topic/title title sectiontitle">模块架构</h2><p class="- topic/p p" data-ofbid="d29579e43__20250121171504">player 在系统架构中的层次如下图</p><p class="- topic/p p" data-ofbid="d29579e45__20250121171504"></p><div class="- topic/p p" data-ofbid="d29579e46__20250121171504"><br/><div class="imagecenter"><img class="- topic/image image imagecenter" id="mpp_player_design_intro__image_h2s_3h3_g1c" src="../../../images/mpp/player_system.png" alt="player_system"/></div><br/></div><ul class="- topic/ul ul" id="mpp_player_design_intro__ul_iq4_jb3_d1c" data-ofbid="mpp_player_design_intro__ul_iq4_jb3_d1c"><li class="- topic/li li" data-ofbid="d29579e51__20250121171504">
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<p class="- topic/p p" data-ofbid="d29579e53__20250121171504">player 是中间件，向 App 提供 player 接口</p>
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<ul class="- topic/ul ul" id="mpp_player_design_intro__ul_jq4_jb3_d1c" data-ofbid="mpp_player_design_intro__ul_jq4_jb3_d1c"><li class="- topic/li li" data-ofbid="d29579e57__20250121171504">
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<p class="- topic/p p" data-ofbid="d29579e59__20250121171504">player 视频解码调用 mpp_decoder</p>
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</li><li class="- topic/li li" data-ofbid="d29579e62__20250121171504">
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<p class="- topic/p p" data-ofbid="d29579e64__20250121171504">player 音频解码调用 audio_decoder</p>
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</li><li class="- topic/li li" data-ofbid="d29579e67__20250121171504">
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<p class="- topic/p p" data-ofbid="d29579e69__20250121171504">player 视频渲染操作 DE driver 提供<span class="- topic/ph ph">的接口</span></p>
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</li><li class="- topic/li li" data-ofbid="d29579e74__20250121171504">
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<p class="- topic/p p" data-ofbid="d29579e76__20250121171504">player 音频渲染操作 Sound driver 提供的接口</p>
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</li><li class="- topic/li li" data-ofbid="d29579e79__20250121171504">
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<p class="- topic/p p" data-ofbid="d29579e81__20250121171504">player 内部实现解封装的功能</p>
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</li></ul>
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</li><li class="- topic/li li" data-ofbid="d29579e85__20250121171504">
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<p class="- topic/p p" data-ofbid="d29579e87__20250121171504">audio_decoder(音频解码器)</p>
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<ul class="- topic/ul ul" id="mpp_player_design_intro__ul_kq4_jb3_d1c" data-ofbid="mpp_player_design_intro__ul_kq4_jb3_d1c"><li class="- topic/li li" data-ofbid="d29579e91__20250121171504">
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<p class="- topic/p p" data-ofbid="d29579e93__20250121171504">audio_decoder 是纯软件解码，目前移植了第三方的 libmad 和 faad ，支持 MP3 和 AAC 解码。</p>
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</li></ul>
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</li></ul><p class="- topic/p p" data-ofbid="d29579e97__20250121171504">player 模块架构如下图,分为 3 层</p><ul class="- topic/ul ul" id="mpp_player_design_intro__ul_lq4_jb3_d1c" data-ofbid="mpp_player_design_intro__ul_lq4_jb3_d1c"><li class="- topic/li li" data-ofbid="d29579e100__20250121171504">
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<p class="- topic/p p" data-ofbid="d29579e102__20250121171504">第 1 层,player interface ,向上提供 player 接口,向下调用 OpenMAX 组件实现 player 功能。</p>
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</li><li class="- topic/li li" data-ofbid="d29579e105__20250121171504">
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<p class="- topic/p p" data-ofbid="d29579e107__20250121171504">第 2 层,OpenMAX Component,提供统一的组件操作接口。每个组件完成特定的功能,比如视频解码,视频渲染等。</p>
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</li><li class="- topic/li li" data-ofbid="d29579e110__20250121171504">
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<p class="- topic/p p" data-ofbid="d29579e112__20250121171504">第 3 层,Base，提供 parser，stream，message，render 接口和实现。</p>
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<ul class="- topic/ul ul" id="mpp_player_design_intro__ul_mq4_jb3_d1c" data-ofbid="mpp_player_design_intro__ul_mq4_jb3_d1c"><li class="- topic/li li" data-ofbid="d29579e116__20250121171504">
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<p class="- topic/p p" data-ofbid="d29579e118__20250121171504">parser 提供解封装的功能，比如 MP4 封装</p>
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</li><li class="- topic/li li" data-ofbid="d29579e121__20250121171504">
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<p class="- topic/p p" data-ofbid="d29579e123__20250121171504">stream 提供解析流协议的功能，本地文件也看作是一种流协议，目前也只支持本地文件</p>
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</li><li class="- topic/li li" data-ofbid="d29579e126__20250121171504">
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<p class="- topic/p p" data-ofbid="d29579e128__20250121171504">message 为组件传递消息提供支持</p>
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</li><li class="- topic/li li" data-ofbid="d29579e131__20250121171504">
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<p class="- topic/p p" data-ofbid="d29579e133__20250121171504">render 提供底层音视频渲染的功能</p>
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</li><li class="- topic/li li" data-ofbid="d29579e136__20250121171504"><p class="- topic/p p" data-ofbid="d29579e137__20250121171504">目前支持 MP4 和 MP3 封装的本地文件，后续扩展其他流协议和封装格式，通过增加相应的 parser 和 stream
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实现</p><div class="- topic/p p" data-ofbid="d29579e139__20250121171504"><br/><div class="imagecenter"><img class="- topic/image image imagecenter" id="mpp_player_design_intro__image_nq4_jb3_d1c" src="../../../images/mpp/player_framework.png" alt="player_framework1"/></div><br/></div></li></ul>
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