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
Also avoid fetching manifest updates when minimumUpdatePeriod is
missing. In the absence of minimumUpdatePeriod, just reprocess
the MPD we already downloaded.
Closes#69, #70.
Change-Id: I138bf136e5b0d691d9d625bbad02fb07ae21d32f
Strip extraneous minBufferTime copies.
Default minBufferTime in MpdProcessor if missing.
Pass minBufferTime as a parameter to Stream.start().
Keep a buffering goal separate from minBufferTime, which will only
be used for stream startup (as intended by the DASH spec).
This allows us to startup quickly and still buffer ahead.
Relates to #51.
Change-Id: I94b6b2566419344fa761ff75b0884719f255cd66
Since SegmentTimeline streams may not have segment numbers, we should
not use segment numbers as reference IDs. These IDs must be unique
for the buffering and streaming systems to function properly.
This also adds assertions to check that reference IDs are unique.
Issue #21.
Change-Id: Ia94a48c68149283f87d27c6595a4f5a6cca07a27
A SegmentIndex only provides an approximation of its media timeline. The
differences between the two can be particularly problematic if the
SegmentIndex is "behind" its media timeline, as such an offset may cause
the stream to get stuck during startup.
* Correct each SegmentIndex using timestamps in the actual segments.
* Make hasStarted() return true only after the Stream fully initializes.
* Adjust the seek range after computing a timestamp correction.
* Set timestampOffset for all types of SegmentTemplate based manifests.
* Remove PTO rounding, which is not required with timestamp correction.
* Only attempt to resync Streams after all streams have started.
Change-Id: Id03c38826d07513d8f451029ffc9d891854c19df
* Only fallback to 0 for the earliest timestamp if there are
no segments.
* Don't allow the best timestamp to be less than the earliest
timestamp.
Issue #21
Change-Id: Ie4df6e36d60adc0ee0dfc54dcbefef7ae0de2705
* Make function order in mpd_processor.js match function
dependencies.
* Make a two line parameter list into a one line parameter list.
Actual code and comments are not changed.
Change-Id: I586b2552601a3c36c5cd1711f4589447213462a4
* Rename SegmentIndex functions to shorter names.
* Add first() and last() functions for convenience.
* Throw exceptions for out of range errors.
* Handle more corner-cases in merge().
* Add more unit tests.
Change-Id: If875cd766e7091504c028413694326fcdf2aae5b
* After updating a manifest restart any streams that failed
to initially start.
* Seek to the stream start time only after the streams have been
initialized, seeking before can cause lock-ups with MSE.
* Rename 'bestStartTime' to 'currentSegmentStartTime'.
Issue #21
Change-Id: Ibad91fe2d5171196e93f20961008cdd25ecc437e
* Construct the initial SegmentIndex for a live stream such that it
includes at least @timeShiftBufferDepth seconds of content before
the "live-edge".
* Use segment numbers relative to @startNumber instead of relative
to the start of the Period in SegmentReference to handle MPDs
with partial segment information.
* Start live streams near the "live-edge", a.k.a., "best start time",
and start static streams at the latest start time.
Issue #21
Change-Id: I3c553a1b7120a59c68f19cdc85f412f31972c1b8
* Expand SegmentTemplates directly to StreamInfos instead of using
intermediate SegmentBases and SegmentLists.
* Remove "fake" attributes from SegmentBase and SegmentUrl.
* Simplify Period duration derivation.
* Add additional unit tests.
Change-Id: I203e269bd9dfb1fb1cc4ca48be29043c1ee4007b
* Set SourceBuffer.timestampOffset to StreamInfo.timestampOffset
directly.
* Compute StreamInfo.timestampOffset in MpdProcessor.
Change-Id: Iea5621bc29df3de29d378e58720d6f71452274cd
The clock will be synced, when possible, to the server hosting the
MPD. The synced clock will only be used in places where accurate
time matters, such as in loggable player stats and in live streaming.
Relates to #21
Change-Id: Id9da1cf23a781f2ce07a46e0936695d512a65133
* Implement an update() method on StreamVideoSource that merges
a new manifest into its existing one.
* Re-fetch and re-process MPDs from DashVideoSource to generate new
SegmentReferences.
* Compute last available segment numbers and times in MpdProcessor
when generating SegmentLists.
* Re-work Period computation in MpdProcessor.
* Handle stream EOF differently for live content.
Additional work is required to handle all "styles" of manifests.
Issue #21
Change-Id: I38be9513dc73e4683d1079b4dedb489e8206043d
* Instead of overriding SegmentBase, SegmentList, etc. between
levels (e.g., from Period to AdaptationSet) merge them, but
prefer elements and attributes from inner levels.
* Refactor MPD parsing unit tests into separate files.
* Rewrite SegmentBase unit tests, add SegmentList, and
SegmentTemplate unit tests.
Change-Id: I3fdb7657bb9f468e10f63e47e9a52fbf8ebbd40b
* Correctly compute the number of segments when generating
a SegmentList from a SegmentTemplate with a segment duration.
* Update unit tests.
Change-Id: Ic3edfd8c6eb8173ea52a4c606bbcd38c662de55f
This removes reliance on MediaKeys.isTypeSupported and instead uses the
supportedConfigurations parameter of requestMediaKeySystemAccess.
A lot of refactoring went into this effort, particularly around
StreamVideoSource, StreamSetInfo, and StreamInfoProcessor.
Closes#2, b/19354928.
Change-Id: Ibf81da909b8207b5babaec5ef0422dd1293d130d
* Stretch/compress segments within a SegmentTimeline to align them
to the beginning of the next segment.
This does not allow playback of content with actual gaps in it, but
allows MPDs with inaccurate SegmentTimelines to be used.
Closes#24, b/19144876
Change-Id: I183935db23fe26e1d6295e099b201a6af487d53b
* Revert 5c7fca90b6, which intended
to allow startNumber to be 0, and maintain the previous behavior,
which requires startNumber to begin at 1 (this appears to be in-line
with the MPD spec).
* Correctly compute the $Time$ placeholder.
* Rename firstSegmentNumber to startNumber to clarify code.
Closes#10
Change-Id: I9b565edc9e23b9ad7c6bc62829d6b0ab565008a4
* Adjust SourceBuffer timestamps forward by the Period's
start time and backwards by the Representation's
presentationTimeOffset.
* Incorporate the start time of a Representation's first
segment in the calculation of a Period's duration.
* Seek to the latest start time before starting playback.
Further adjustments will be required to support live playback.
Closes#17, b/19130302
Change-Id: Ia9fe6d8bbe5a69488130de2d8b146ce54dfff50e
AdaptationSets are sorted by language (audio-only), then by those with
the "main" role. Main sets are preferred when there are multiple to
choose from.
Closes#20, b/19214703.
Change-Id: I4fdd601c0bd7c7d29801084199123311ab9dbec3
* Move internal non-DASH specific code into the 'media' namespace.
* Remove DASH references from generic stream code.
The documentation is not changed as a follow-up patch will factor out
DASH functionality from StreamVideoSource back into a new
DashVideoSource class.
b/18903621
Change-Id: I78d6e4f2824d4983619f17872828d95655fcfe50
* Create generic stream description classes to represent
Representations, AdaptationSets, and Periods.
* Move generic stream selection logic out of MpdProcessor and
into StreamInfoProcessor.
* Refactor DashVideoSource and DashStream to use the generic
stream description classes.
A follow-up patch is required to re-organize files and namespaces.
b/18903621
b/18948677
Change-Id: I8bbb87ebf0242b31541199d0d1d3c40767c93a29
Timothy Drews
Joey Parrish