An overview of Stagefright player

最新推荐文章于 2022-10-10 16:23:25 发布

原创最新推荐文章于 2022-10-10 16:23:25 发布 · 734 阅读

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#codec #playback #audio #plugins #android #system

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本文深入探讨了Google在Android 2.0中引入的Stagefright播放引擎，它采用了一种相对简单直接的方法。通过MediaExtractor模块检索文件系统或HTTP流中的轨道数据和元数据，OMX插件用于解码，AudioPlayer负责音频渲染，并根据所选编解码器创建本地或远程渲染。AwesomePlayer作为协调各个模块的引擎，最终通过Stagefright Player适配器连接到Android媒体框架。

There is a new playback engine implemented by Google comes with Android 2.0 (i.e, Stagefright), which seems to be quite simple and straightforward compared with the OpenCORE solution.

MediaExtractor is responsible for retrieving track data and the corresponding meta data from the underlying file system or http stream;
Leveraging OMX for decoding: there are two OMX plugins currently, adapting to PV's software codec and vendor's hardware implementation respectively. And there is a local implementation of software codecs which encapsulates PV's decoder APIs directly;
AudioPlayer is responsible for rendering audio, it also provides the timebase for timing and A/V synchronization whenever audio track is present;
Depending on which codec is picked, a local or remote render will be created for video rendering; and system clock is used as the timebase for video only playback;
AwesomePlayer works as the engine to coordinate the above modules, and is finally connected into android media framework through the adapter of StagefrightPlayer.