SDK / exoplayer

- Add missing callback call.
- Allow injection of live edge offset.
- Refine calculation of live window size to correctly
  handle just-started streams where the DVR window
  hasn't yet grown to full size.

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Created by MOE: https://github.com/google/moe
MOE_MIGRATED_REVID=130412465

Also allow use of suggestedPresentationDelay taken from the
manifest, and enable this by default.

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Created by MOE: https://github.com/google/moe
MOE_MIGRATED_REVID=130409924

SinglePeriodTimelines can all use the same identifier, as their identifier is
wrapped in a pair with the (fixed) source index when they are concatenated with
other sources' timelines.

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Created by MOE: https://github.com/google/moe
MOE_MIGRATED_REVID=130386297

This is a 1:1 mapping. This change formalises the fact,
and makes it possible to easily query the mapping.

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Created by MOE: https://github.com/google/moe
MOE_MIGRATED_REVID=130375111

This was always a bit of a hack; for Play Movies. It may well
no longer be necessary, and if not I'd like to think of a nicer
or more general way of doing it. We can always bring it back
if needed.

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Created by MOE: https://github.com/google/moe
MOE_MIGRATED_REVID=130373433

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Created by MOE: https://github.com/google/moe
MOE_MIGRATED_REVID=130369177

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Created by MOE: https://github.com/google/moe
MOE_MIGRATED_REVID=130293908

Also, fix clearing the timeline for source info changes.

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Created by MOE: https://github.com/google/moe
MOE_MIGRATED_REVID=130292700

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Created by MOE: https://github.com/google/moe
MOE_MIGRATED_REVID=130289294

- This avoids the need to have to use the timeline to
  calculate a window duration, which can be awkward.
- Window now represents a window of availability with
  an isSeekable flag, rather than a window of
  seekability.
- Promoted Timeline and Window to top package; they're
  pretty important :).

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Created by MOE: https://github.com/google/moe
MOE_MIGRATED_REVID=130278509

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Created by MOE: https://github.com/google/moe
MOE_MIGRATED_REVID=130266483

It's no longer safe to convert END_OF_SOURCE -> duration on
the main therad, since the Timeline from which the duration
is obtained is posted to the main thread, where-as the
buffered position is passed by updating a volatile. Hence
an update to the latter might become visible to the main
thread before the corresponding Timeline.

This change moves the conversion to the playback thread.

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Created by MOE: https://github.com/google/moe
MOE_MIGRATED_REVID=130265893

This is in preparation for making it so that periods aren't reused.

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Created by MOE: https://github.com/google/moe
MOE_MIGRATED_REVID=130113382

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Created by MOE: https://github.com/google/moe
MOE_MIGRATED_REVID=130111048

This kind of mp4 files has been seen in Hls+fMp4 samples.

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Created by MOE: https://github.com/google/moe
MOE_MIGRATED_REVID=130094845

- For audio/video, we should report the minimum largest
  queued timestamp. This ensures that buffering continues
  rather than stops in the case of bad sample interleaving.
- If there are "sparse" tracks then they should be ignored
  for this calculation, otherwise the buffered position can
  end up getting stuck at some small value (e.g. if there's
  a text track containing a single sample with a small
  timestamp).
- In the edge case that there are only "sparse" tracks, we
  probably want to take the maximum largest queued time
  instead.

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Created by MOE: https://github.com/google/moe
MOE_MIGRATED_REVID=130094266

CacheSpan.isEOS (is end of stream) field shows whether the {@link CacheSpan} contains the end of the original stream.

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Created by MOE: https://github.com/google/moe
MOE_MIGRATED_REVID=130084365

*** Reason for rollback ***

Referential equality was probably the right thing to do, since using .equals
breaks track selection in the case that a source exposes two or more tracks
whose formats are equal. We should fix the way overrides work instead.

*** Original change description ***

Fix multi-period transitions with track selection overrides

An override applies across periods provided they expose the
same track groups according to .equals, but the formats in
the override are then compared against the period's formats
according to ==. Use .equals consistently to fix.

***

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Created by MOE: https://github.com/google/moe
MOE_MIGRATED_REVID=130083840

It's error prone (and more code) to report two ways

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Created by MOE: https://github.com/google/moe
MOE_MIGRATED_REVID=129999117

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Created by MOE: https://github.com/google/moe
MOE_MIGRATED_REVID=129993536

To generate the reports, under 'v2' folder run:
./gradlew createDebugCoverageReport

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Created by MOE: https://github.com/google/moe
MOE_MIGRATED_REVID=129991223

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Created by MOE: https://github.com/google/moe
MOE_MIGRATED_REVID=129987973

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Created by MOE: https://github.com/google/moe
MOE_MIGRATED_REVID=129987709

This change allows MediaPeriod instances to replace
SampleStream instances when the selection isn't changing.
It also allows MediaPeriod instances to retain a
SampleStream but indicate that the renderer consuming
from it needs to be reset.

The change is used to fix the ref'd bug, and is used to
do the same thing in HLS without the need for the source
to report a discontinuity. Note that reporting discontinuity
could cause unnecessary failure when used as a child of
MergingMediaSource.

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Created by MOE: https://github.com/google/moe
MOE_MIGRATED_REVID=129971782

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Created by MOE: https://github.com/google/moe
MOE_MIGRATED_REVID=129966073

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Created by MOE: https://github.com/google/moe
MOE_MIGRATED_REVID=129908648

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Created by MOE: https://github.com/google/moe
MOE_MIGRATED_REVID=129892143

If a renderer is reading ahead of the playing period, seeking within the
playing period would fail, because renderers would not be disabled but then try
to read from SampleStreams that have a released period.

Also, in the same circumstances, seeking within the reading period would fail,
because all renderers would be disabled, but their sample streams have already
been read. When they are reenabled they expect to see a format but don't
receive one.

In both cases, seeking can just clear the timeline. This only occurs in rare
circumstances when the player is reading ahead, so the cost of re-preparing
will not be incurred often, and allows the seeking logic to be simpler.

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Created by MOE: https://github.com/google/moe
MOE_MIGRATED_REVID=129891060

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Created by MOE: https://github.com/google/moe
MOE_MIGRATED_REVID=129871792

It's no longer used.

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Created by MOE: https://github.com/google/moe
MOE_MIGRATED_REVID=129870115

Issue #1712

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Created by MOE: https://github.com/google/moe
MOE_MIGRATED_REVID=129869936

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Created by MOE: https://github.com/google/moe
MOE_MIGRATED_REVID=129869741

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Created by MOE: https://github.com/google/moe
MOE_MIGRATED_REVID=129868070

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Created by MOE: https://github.com/google/moe
MOE_MIGRATED_REVID=129867969

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Created by MOE: https://github.com/google/moe
MOE_MIGRATED_REVID=129851843

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Created by MOE: https://github.com/google/moe
MOE_MIGRATED_REVID=129849825

Referential equality is going to become important for detecting
whether a SampleStream has been replaced, so we need to create
new instances as we do elsewhere.

This also enables multiple SampleStreams to be provided for a
single TrackGroup, as is also true for DASH and SmoothStreaming.
It's forbidden to ask for multiple SampleStreams from a single
TrackGroup currently, but we may choose to relax that at some
point (and indicate whether it's allowed as a flag on each
TrackGroup).

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Created by MOE: https://github.com/google/moe
MOE_MIGRATED_REVID=129842336

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Created by MOE: https://github.com/google/moe
MOE_MIGRATED_REVID=129787235

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Created by MOE: https://github.com/google/moe
MOE_MIGRATED_REVID=129748865

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Created by MOE: https://github.com/google/moe
MOE_MIGRATED_REVID=129747377