An overview of Stagefright player

最新推荐文章于 2021-05-25 20:00:43 发布

转载最新推荐文章于 2021-05-25 20:00:43 发布 · 706 阅读

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

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本文介绍了随Android 2.0发布的Stagefright播放引擎，该引擎由Google实现，相较于OpenCORE解决方案更为简洁直接。文章详细阐述了Stagefright内部模块如MediaExtractor、AudioPlayer及AwesomePlayer的工作原理和职责。

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.