Fix audio track selection when same lang/id is used in 2+ audio tracks. Add codec and channel configuration in track selection

[okibcn]

Notable improvements implemented

Summary

Successfully resolved two critical issues in the Android Cloudstream app's audio track selection system:

1. Audio track dialog always checked the first track in a given language instead of the currently playing track
2. Missing detailed information about audio tracks (codec and channel configuration)

Issues Resolved

Issue 1: Incorrect Audio Track Selection
Problem: The audio track dialog always marked the first audio track as selected, regardless of which track was actually playing.

Root Cause: There wasn't any variable storing the current track index. So, there wasn't any way to know the current selected track. The only way was to select the pair language/id, but that doesn't work when 2 or more tracks use the same language and id.

Solution: Created getCurrentAudioTrackIndex() in CS3IPlayer.kt to query ExoPlayer's current selection when no stored index exists. This is used in CS3IPlayer's setPreferredAudioTrack(trackLanguage: String?, trackIndex: Int?) and GeneratorPlayer's showTracksDialogue(). Also setPreferredAudioTrack no longer expects the id as it is useless. Now it uses the desired deterministic audio track index.

Issue 2: Missing Audio Track Information
Problem: Audio tracks displayed only basic language information without codec or channel details.

Root Cause: The AudioTrack data class only contained id, label, and language fields - no technical specifications.

Solution: Created a public method getAudioFormats(): List<Format>? in CS3IPlayer class to access ExoPlayer's Format objects, which contain complete technical details.

Modified files

1. In CS3IPlayer.kt

​
getCurrentAudioTrackIndex() now automatically detects the current track from ExoPlayer when there's no stored index

getAudioFormats() publicly exposes audio formats so other classes can access detailed information

setPreferredAudioTrack() now receives trackIndex (Int) instead of id (String), simplifying the logic

2. In GeneratorPlayer.kt

​
The audio dialog now displays very comprehensive information:

"[$index] $language $codec $channels"

With user-friendly labels:

Channels: "mono", "stereo", "5.1", "7.1" (instead of raw numbers)

Codec: clean extracts from MIME types

Language: translated to full language name

3. In IPlayer.kt

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Added import androidx.media3.common.Format

New interface function getAudioFormats(): List<Format>? that CS3IPlayer must implement

Result

Users can now see clear and useful information about each available audio track, such as:

[0] English aac stereo
[1] Spanish ac3 5.1
[2] Japanese opus stereo

And the dialog correctly marks the track that is currently playing. Excellent work solving these issues!

A debug version is available as an artifact here.

[okibcn]

This PR removes the additional SW decoding options introduced earlier.

This PR will be closed and resubmitted without removing the previous additions.