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24 lines
1.9 KiB
24 lines
1.9 KiB
4 years ago
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# Glossary
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**Playlist**: This is a representation of an HLS or DASH manifest.
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**Media Playlist**: This is a manifest that represents a single rendition or media stream of the source.
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**Master Playlist Controller**: This acts as the main controller for the playback engine. It interacts with the SegmentLoaders, PlaylistLoaders, PlaybackWatcher, etc.
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**Playlist Loader**: This will request the source and load the master manifest. It is also instructed by the ABR algorithm to load a media playlist or wraps a media playlist if it is provided as the source. There are more details about the playlist loader [here](./arch.md).
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**DASH Playlist Loader**: This will do as the PlaylistLoader does, but for DASH sources. It also handles DASH specific functionaltiy, such as refreshing the MPD according to the minimumRefreshPeriod and synchronizing to a server clock.
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**Segment Loader**: This determines which segment should be loaded, requests it via the Media Segment Loader and passes the result to the Source Updater.
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**Media Segment Loader**: This requests a given segment, decrypts the segment if necessary, and returns it to the Segment Loader.
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**Source Updater**: This manages the browser's [SourceBuffers](https://developer.mozilla.org/en-US/docs/Web/API/SourceBuffer). It appends decrypted segment bytes provided by the Segment Loader to the corresponding Source Buffer.
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**ABR(Adaptive Bitrate) Algorithm**: This concept is described more in detail [here](https://en.wikipedia.org/wiki/Adaptive_bitrate_streaming). Our chosen ABR algorithm is referenced by [selectPlaylist](../README.md#hlsselectplaylist) and is described more [here](./bitrate-switching.md).
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**Playback Watcher**: This attemps to resolve common playback stalls caused by improper seeking, gaps in content and browser issues.
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**Sync Controller**: This will attempt to create a mapping between the segment index and a display time on the player.
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