SDK / exoplayer

Issue: #1195
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Created by MOE: https://github.com/google/moe
MOE_MIGRATED_REVID=117155301

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Created by MOE: https://github.com/google/moe
MOE_MIGRATED_REVID=117149421

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Created by MOE: https://github.com/google/moe
MOE_MIGRATED_REVID=117148015

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Created by MOE: https://github.com/google/moe
MOE_MIGRATED_REVID=117141509

Set the duration to the sum of the final period's start
+ duration (if available) if MPD@mediaPresentationDuration
isn't set in the manifest.
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Created by MOE: https://github.com/google/moe
MOE_MIGRATED_REVID=117141391

Issue: #1193
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Created by MOE: https://github.com/google/moe
MOE_MIGRATED_REVID=117136800

Issue: #1185
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Created by MOE: https://github.com/google/moe
MOE_MIGRATED_REVID=117136646

Issue #1181
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Created by MOE: https://github.com/google/moe
MOE_MIGRATED_REVID=117136370

Issue: #1235
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Created by MOE: https://github.com/google/moe
MOE_MIGRATED_REVID=117131149

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Created by MOE: https://github.com/google/moe
MOE_MIGRATED_REVID=117131005

- readFully calls when reading a string or varint may have 0 length.
  The behavior of a 0 length read isn't well defined either at the
  ExtractorInput or DataSource level, particularly when the read may
  also coincide with EOS. We'll work on defining these cases properly
  going forward, but in the meantime this fix avoids attempting 0
  length reads.
- [Aside] UTF8 the is guaranteed default charset on Android.
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Created by MOE: https://github.com/google/moe
MOE_MIGRATED_REVID=117130356

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Created by MOE: https://github.com/google/moe
MOE_MIGRATED_REVID=117129870

DTS Express (which is DTS LBR according to http://www.mp4ra.org/codecs.html) is
not supported for passthrough playback currently. Associate a different MIME
type with it so that we don't try to use DTS passthrough for playing DTS
Express.

The MIME type for DTS Express is just vnd.dts.hd, with a profile parameter
indicating that it's DTS Express rather than one of the other formats.
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Created by MOE: https://github.com/google/moe
MOE_MIGRATED_REVID=117129583

Handle minor timing difference between the different media content
and the available range values as specified in the MPD.

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Created by MOE: https://github.com/google/moe
MOE_MIGRATED_REVID=117127112

The logic in the platform was causing captions and the reported
playback position to gradually drift out of sync with respect to
audio and video.
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Created by MOE: https://github.com/google/moe
MOE_MIGRATED_REVID=117126970

Issue: #1197
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Created by MOE: https://github.com/google/moe
MOE_MIGRATED_REVID=117125081

Notes:

- The way this works is that every time the player needs to
  select some tracks it invokes the TrackSelector. When a
  track selection is actually activated (i.e. "hits the
  screen") it gets passed back to the TrackSelector, which
  allows it to expose the current tracks through an API that
  it may choose to define. Since playlist support doesn't exist
  yet, it's currently the case that the pass-back always occurs
  immediately.
- A TrackSelector can invalidate its previous selections if its
  selection criteria changes. This will force the player to invoke
  it again to make a new selection. If the new selection is the
  same as the previous one for a renderer then the player handles
  this efficiently (i.e. turns it into a no-op).
- DefaultTrackSelector supports disabling/enabling of renderers.
  Separately, it supports overrides to select specific formats.
  Since formats may change (playlists/periods), overrides are
  specific to not only the renderer but also the set of formats
  that are available to it. If the formats available to a renderer
  change then the override will no longer apply. If the same set
  of formats become available at some point later, it will apply
  once more. This will nicely handle cases like ad-insertion where
  the ads have different formats, but all segments of main content
  use the same set of formats.
- In general, in  multi-period or playlist cases, the preferred
  way of selecting formats will be via constraints (e.g. "don't play
  HD", "prefer higher quality audio") rather than explicit format
  selections. The ability to set various constraints on
  DefaultTrackSelector is future work.

Note about the demo app:

- I've removed the verbose log toggle. I doubt anyone has
  ever used it! I've also removed the background audio option.
  Without using a service it can't be considered a reference
  implementation, so it's probably best to leave developers to
  figure this one out. Finally, listening to AudioCapabilities
  has also gone. This will be replaced by having the player
  detect and handle the capabilities change internally in a
  future CL. This will work by allowing a renderer to invalidate
  the track selections when its capabilities change, much like
  how a selector is able to invalidate the track selections in
  this CL.
- It's now possible to enable ABR with an arbitrary subset of
  tracks.
- Unsupported tracks are shown grayed out in the UI. I'm not
  showing tracks that aren't associated to any renderer, but we
  could optionally add that later.
- Every time the tracks change, there's logcat output showing
  all of the tracks and which ones are enabled. Unassociated
  tracks are displayed in this output.
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Created by MOE: https://github.com/google/moe
MOE_MIGRATED_REVID=117122202

- I don't think the length is useful in hashCode; if the length
  is different then Arrays.hashCode should account for that.
- "this." just for consistency across these classes.
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Created by MOE: https://github.com/google/moe
MOE_MIGRATED_REVID=116641142

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Created by MOE: https://github.com/google/moe
MOE_MIGRATED_REVID=116638211

This change replaces TrackGroup[] with TrackGroupArray. This is
to allow equality based hashCode and equals implementations.
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Created by MOE: https://github.com/google/moe
MOE_MIGRATED_REVID=115563146

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Created by MOE: https://github.com/google/moe
MOE_MIGRATED_REVID=115561885

This change allows a TrackRenderer to distinguish between the
"I don't support this type at all" case and the "I am a general
purpose renderer of this type, but cannot support the specific
subtype" case.

Bug=26622675
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Created by MOE: https://github.com/google/moe
MOE_MIGRATED_REVID=115454950

The TrackSelector API will look like:

TrackSelection[] selectTrack(
    TrackRenderer[] renderers, TrackGroup[] trackGroups);

In this CL:

- SampleSources return TrackGroup[], so that the result can be easily
  passed to the selector.
- TrackStream gets its own file to sit alongside other Track* classes.
- A TrackSelection object is introduced to encapsulate group and track
  indices.
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Created by MOE: https://github.com/google/moe
MOE_MIGRATED_REVID=115251331

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Created by MOE: https://github.com/google/moe
MOE_MIGRATED_REVID=114963314

- Add a top level failure type (source/renderer/unexpected),
  and convenience methods for retrieving the underlying cause
  without needing to cast.
- Also add renderer index in the case of renderer failures.
- setIndex/getIndex is a little . . . unclean, but alternatives
  involve either having the top line of the stack trace be a
  non-interesting line, or loads of try/catch blocks in
  ExoPlayerImplInternal.

Issue: #777
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Created by MOE: https://github.com/google/moe
MOE_MIGRATED_REVID=114763073

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Created by MOE: https://github.com/google/moe
MOE_MIGRATED_REVID=114743795

- Format can represent both container and sample formats.
  If a container contains a single track (as is true in
  DASH and SmoothStreaming) then the container Format can
  also contain sufficient information about the samples
  to allow for track selection. This avoids the Format to
  MediaFormat conversions that we were previously doing in
  ChunkSource implementations.

- One important result of this change is that adaptive
  format evaluation and static format selection now use the
  same format objects, which is a whole lot less confusing
  for someone who wants to implement both initial selection
  and subsequent adaptation logic. It's not in the V2 doc,
  but it may well make sense if the TrackSelector not only
  selects the tracks to enable for an adaptive playback, but
  also injects a FormatEvaluator when enabling them that will
  control the subsequent adaptive selections. That would make
  it so that all format selection logic originates from the
  same place.

- As part of this change, the adaptiveX variables are removed
  from the format object; they don't really correspond to a
  single format. This also saves on having to inject the max
  video dimensions through a bunch of classes.
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Created by MOE: https://github.com/google/moe
MOE_MIGRATED_REVID=114546777

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Created by MOE: https://github.com/google/moe
MOE_MIGRATED_REVID=114545827

Duration was originally included in MediaFormat to match the
framework class, but it actually doesn't make much sense. In
many containers there's no such thing as per-stream duration,
and in any case we don't really care. Setting the duration on
each format required excessive piping.

This change moves duration into SeekMap instead, which seems
to make a lot more sense because it's at the container level,
and because being able to seek is generally couplied with
knowing how long the stream is.

This change is also a step toward merging Format and MediaFormat
into a single class (because Format doesn't have a duration),
which is coming soon.
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Created by MOE: https://github.com/google/moe
MOE_MIGRATED_REVID=114428500

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Created by MOE: https://github.com/google/moe
MOE_MIGRATED_REVID=114427767

[Step 4 - Partial, of []

- The capabilities checks previously performed in VideoFormatSelectorUtil
  are now performed in MediaCodecVideoTrackRenderer. This means they'll be
  useful for non-chunk use cases (e.g. when using ExtractorSampleSource).
- Added capabilities checks for audio in MediaCodecAudioTrackRenderer. We
  didn't check audio capabilities previously.
- Added functionality to allow a TrackRenderer to indicate the extent of
  its adaptive support.

The idea here is that a TrackSelector (to be introduced) will have access to:

(a) TrackGroups from the SampleSource that indicate whether they support
adaptive playbacks and the formats of each individual track.
(b) TrackRenderers that indicate whether they support adaptive playbacks as
well as how capable they are of rendering formats of individual tracks.

This is everything that a TrackSelector needs from the player components in
order to decide how to wire things up. Note that a TrackSelector may opt to
treat FORMAT_EXCEEDS_CAPABILITIES as FORMAT_HANDLED at its own risk, if it
thinks that it (or the user) knows better. This is a request that we've seen
from third parties for better handling cases where capabilities aren't
accurately reported by the underlying platform.
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Created by MOE: https://github.com/google/moe
MOE_MIGRATED_REVID=114427428

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Created by MOE: https://github.com/google/moe
MOE_MIGRATED_REVID=113868179

Delete SingleSampleChunkSource. I don't think it's really
useful for anything, now we have SingleSampleSource.
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Created by MOE: https://github.com/google/moe
MOE_MIGRATED_REVID=113259289

This change removes the need for SourceBuilders to load their
manifests before building their sources. This is done by pushing
initial manifest loads into the ChunkSource classes. This simplifies
the SourceBuilders a lot, and also DemoPlayer.
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Created by MOE: https://github.com/google/moe
MOE_MIGRATED_REVID=113259259

Notes:
1. The logic in ExoPlayerImplInternal is very temporary, until we
   have proper TrackSelector implementations. Ignore the fact that
   it's crazy and has loads of nesting.
2. This change removes all capabilities checking. TrackRenderer
   implementations will be updated to perform these checks in a
   subsequent CL.

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Created by MOE: https://github.com/google/moe
MOE_MIGRATED_REVID=113151233

Move binding of tracks<->renderers to ExoPlayerImplInternal.
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Created by MOE: https://github.com/google/moe
MOE_MIGRATED_REVID=113046018

GitHub note - Apologies for the cryptic change descriptions,
they relate to a design doc that's not externally visible.

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Created by MOE: https://github.com/google/moe
MOE_MIGRATED_REVID=113043764