mirror of
https://github.com/shaka-project/shaka-player.git
synced 2026-06-14 15:56:38 +03:00
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
42 lines
1.7 KiB
HTML
42 lines
1.7 KiB
HTML
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Copyright 2014 Google Inc.
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Licensed under the Apache License, Version 2.0 (the "License");
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you may not use this file except in compliance with the License.
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You may obtain a copy of the License at
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http://www.apache.org/licenses/LICENSE-2.0
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Unless required by applicable law or agreed to in writing, software
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distributed under the License is distributed on an "AS IS" BASIS,
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WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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See the License for the specific language governing permissions and
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limitations under the License.
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-->
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<p>
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There are several content scenarios we do not support. We make no claims about
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their validity within the DASH specification nor any related specification. We
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have not found any of these things in any existing DASH content. Most of these
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restrictions allow us to make simplifying assumptions in the code.
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<ul>
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<li>MPD Representations containing more than one of SegmentBase, SegmentList,
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or SegmentBase.</li>
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<li>MPD SegmentTimeline combined with an explicit segment index URL.</li>
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<li>Representations within an AdaptationSet where the MIME type varies.</li>
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<li>Changing DRM schemes across MPD Periods.</li>
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<li>Changing DRM schemes when switching MPD Representations.</li>
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<li>WebM streams without initialization segments.</li>
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<li>Parsing dynamically-sized EBML elements in WebM streams.</li>
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<li>Parsing 8-byte EBML IDs in WebM streams. *</li>
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<li>Parsing EBML integers with more than 53 significant bits in WebM streams.
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*</li>
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<li>Parsing nested SIDX boxes in MP4 streams.</li>
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<li>MPD updates that add or remove entire Periods or AdaptationSets.</li>
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</ul>
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* = JavaScript limitation
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</p>
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