SDK / exoplayer

- Do requirements TODO
- Add useful helper method to retrieve not met requirements
- Fix WritableDownloadIndex Javadoc

PiperOrigin-RevId: 245922903

This resolves some naming confusion that previously existed
as a result of DownloadThread also being used for removals.
Some related variables (e.g. activeDownloadCount) would refer
to both download and removal tasks, whilst others
(e.g. maxParallelDownloads) would refer only to downloads.
This change renames those that refer to both to use "task"
terminology.

This change also includes minor test edits.

PiperOrigin-RevId: 245913671

Issue: #5810
PiperOrigin-RevId: 245745646

This allows to use the session management capabilities for other analytics
purposes.

PiperOrigin-RevId: 245710588

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Issue: #5788
PiperOrigin-RevId: 245440858

PiperOrigin-RevId: 245411528

There are no logic changes here. It's just moving code around and removing
the "internal" part of names where no longer required.

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We currently toggle the view in onTouchEvent ACTION_DOWN which is non-standard
and causes problems when used in a ViewGroup intercepting touch events.

Switch to standard Android click handling instead which is also what most
other player apps are doing.

Issue:#5784
PiperOrigin-RevId: 245219728

PiperOrigin-RevId: 245218900

This also removes the build warning about the experimental flag.

PiperOrigin-RevId: 245218251

Also add some unit tests for codecs strings parsing.

PiperOrigin-RevId: 245210490

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The two behave identically, and containsAllOf is being removed.

More information:
  go/containsall-lsc

Tested:
    TAP --sample for global presubmit queue
    http://test/OCL:244737393:BASE:244782138:1555991083653:3080d7c7
PiperOrigin-RevId: 244886736

The two behave identically, and isNotSameAs is being removed.

More information:
  go/issameas-lsc

Tested:
    TAP --sample for global presubmit queue
    http://test/OCL:244736857:BASE:244751659:1555988098671:1e0f72c5
PiperOrigin-RevId: 244886651

PiperOrigin-RevId: 244864742

Disabling stack trackes currently logs messages twice, once with and once
without stack trace.

PiperOrigin-RevId: 244853127

The AndroidX bundled version (0.42) lags behind the most up-to-date public
release (0.44) making it more difficult to stay close to the actual head
revision which is used internally.

PiperOrigin-RevId: 244848568

PiperOrigin-RevId: 244838165

This ensures we keep the loading period in sync with the the playing period in
PlybackInfo, when the latter changes to something new.

PiperOrigin-RevId: 244838123

Also re-enable two of them, although note that the fix here is
not related to the flakiness that caused them to be disabled.
I'm re-enabling them since much has changed in DownloadManager,
and the hope is that these tests are no longer flaky.

PiperOrigin-RevId: 244826225

Experiments show this is beneficial for rebuffers with only minor impact
on battery usage.

Configurations which explicitly set a minimum buffer duration are unaffected.

Issue:#2083
PiperOrigin-RevId: 244823642

PiperOrigin-RevId: 244816212

Before this change we'd release the audio track and create a new one as soon
as audio processors had drained when reconfiguring.

Fix this behavior by stop()ing the AudioTrack to play out all written data.

Issue: #2446
PiperOrigin-RevId: 244812402

- We had buildAddRequest and sendNewDownload. Converged to
  buildAddDownload and sendAddDownload.
- Also fixed a few more inconsistencies, and brought the
  action constants into line as well.

PiperOrigin-RevId: 244274041

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PiperOrigin-RevId: 244267255

- Listener based reporting of progress allows the content length
  to be persisted into the download index (and notified via a
  download state change) as soon as it's available.
- Moved contentLength back into Download proper. It should only
  ever change once, so I'm not sure it belongs in the mutable part
  of Download.
- Made a DownloadProgress class, for naming sanity.

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Assuming there is no text language preference.

PiperOrigin-RevId: 244176667