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Timothy Drews
22c57e99e4
This patch reworks SegmentIndexes so that any SegmentReference they contain is guaranteed to be available. This makes SegmentIndexes work consistently between static content and live content (specifically content specified using SegmentTemplate with @duration). * Rework StreamInfo to use a ISegmentIndexSource and a ISegmentInitSource, which construct a SegmentIndex and an intiailization segment respectively. * Make ManifestInfo destructible and various async operations in StreamVideoSource safer. * Introduce LiveSegmentIndex, which manages SegmentReference eviction. * Introduce DynamicLiveSegmentIndex, which manages SegmentReference eviction and generation. * Implement improved segment availability logic for segment eviction. * Move SegmentIndex construction from MpdProcessor to several ISegmentIndexSource implementations. * Use a SegmentIndex to represent subtitles to simplify Stream creation in StreamVideoSource. * Move manifest update code from StreamVideoSource to ManifestUpdater. * Move PeriodInfo.duration determination in MpdProcessor to StreamVideoSource. * Since "forced" manifest updates are no longer required for content specified using SegmentTemplate with @duration, simplify manifest update code in DashVideoSource. * Make Stream continue to update even if it runs out of SegmentReferences, this simplifies previous resync logic and makes DynamicLiveSegmentIndex work seamlessly. * Refactor SegmentIndex and initialization fetch code in ContentDatabase. * Download all SegmentIndexes in the background after the initial streams have started. Follow up work is required to remove seek range logic from DashVideoSource. Change-Id: I4a908195aba632a911a6e55213fc41d41428162b