SDK / exoplayer

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Issue: #6552
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Issue: #5789
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Issue: #6779
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Issue: #6266
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Issue: #6602
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It's unreliable for at least one IMA ADPCM file I've found.
Calculating the blockIndex to seek to using exact properties
also seems more robust.

Note this doesn't change anything for the existing PCM test,
since averageBytesPerSecond is set correctly. It does make
a difference for an upcoming IMA ADPCM test though.

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Issue: #6733
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Add support for MP3 as an encoding format for passthrough.

This change does not change the observable
behavior of Exoplayer.

Also name the magics.

#exo-offload

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Fix the FlacExtractor constructor for the case where seek(0,0) is not called before reading.

PiperOrigin-RevId: 285811161

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- Make extractor output samples that are uniformly distributed
  with respect to time, with a target of ~10 samples per second.
  The old approach could in theory put every frame into its own
  sample, which would be very inefficient downstream because we'd
  need to pass them individually to MediaCodec. It could also put
  data corresponding to a long duration of time into a single
  sample (e.g. if the sample rate of the content is low), which
  is bad downstream because we decide whether to set the decodeOnly
  flag on a per sample basis. More generally, the new approach
  is more predictable :).

- Stop using the WavSeekMap to get sample timestamps, and instead
  calculate them directly from the number of frames output. It's
  more obviously correct, particularly for data formats like IMA
  ADPCM where we'll need to adjust the data prior to output.

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Also change IcyInfo.rawMetatadata from String to byte[]

ICY doesn't specify the character encoding, and there are streams
not using UTF-8 (issue:#6753). It seems the default of at least one
server is ISO-8859-1 so let's support that as a fallback:
https://github.com/savonet/liquidsoap/issues/411#issuecomment-288759200

Also update IcyDecoder to skip strings it doesn't recognise at all
instead of decoding invalid characters.

The feed from issue:#6753 now decodes accents correctly:
EventLogger:   ICY: title="D Pai - Le temps de la rentrée", url="null"
PiperOrigin-RevId: 285388522

We previously used Locale.fromLanguageTag and then toLanguageTag to automatically
filter out invalid tags and to replace deprecated tags. However, this only works
for API 21+.

This change does no longer rely on the platform methods and instead:
 1. Keeps invalid tags as they are. This may help if developers rely on
    non-spec-complaint language tags (for example, #6681).
 2. Adds a list of deprcated tags and their modern replacements to our code
 3. Normalizes some short codes that have been superseded by macrolanguage codes by
    their macrolanguage equivalent.

Issue:#6681
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Retrieve the sample number in the extractor instead of passing a holder
to FlacBinarySearchSeeker. This change makes the code easier to
understand and is required to implement the seeking from the seek table.

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- Create PcmOutputWriter for PCM.
- In a future change an ImaAdPcmOutputWriter will be introduced
  for IMA ADPCM support.

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- WavHeader is now immutable and contains only values parsed out
  of the WAVE FMT chunk. It no longer contains a C.PcmEncoding
  encoding, or mutable data bounds.
- WavHeaderReader now parses the WAVE header chunks without any
  additional logic (e.g. validating the block alignment value,
  which is format type dependent).
- The SeekMap part of WavHeader is split out into WavSeekMap.

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Flac streams exist but are not commonly used. Also, they are not
supported by the FLAC extension extractor.

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This makes the format metadata null (instead of an empty Metadata
object) when it is not provided, and is therefore consistent with the
other extractors behavior.

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Also remove getRendererCapabilities arg that's now always null.

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Also remove redundant line

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Saves around 200 lines of code. High level overview:
- Rename SampleQueue to SampleDataQueue.
- Rename SampleMetadataQueue to SampleQueue.

This CL should not introduce behavior changes. The only significant
changes in synchronization should be:
+ Add synchronized keyword to isReady.
  - Seems to be necessary.
+ Add synchronized keyword to SampleQueue.sampleMetadata.
  - Before this change, SampleQueue.sampleMetadata could acquire the
    SampleMetadataQueue lock three times in a single method call.

Other miscellaneous improvements:
+ Put all private methods at the bottom.
+ Move release() to the right category.

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I wrote this myself

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