Add Opus audio playback support

[HEIHUAa]

Added OPUS audio playback support.

Also started adding multi-format extension support in ChartMetaData (though this part is unfinished). If you want to use OPUS audio globally right now, you can simply rename .opus files to .ogg — yes, they will still play correctly this way.

Also, OGG is itself a container format that supports Opus encoding. So you can absolutely encode your audio as Opus and package it within an OGG container.

[NexIsDumb]

woah, i'll surely check this out

[HEIHUAa]

哇，我肯定会检查这个的

What a coincidence! I just finished implementing the auto-detection feature.

[Raltyro]

I was actually thinking of implementing it as a decoder so the getSound Assets function isnt a mess

[HEIHUAa]

我实际上想将其实现为一个解码器，这样 getSound Assets 函数就不会一团糟了

cool

[Vortex2Oblivion]

wowzers

[HEIHUAa]

I'm wondering if Opus support can be implemented in version 1.0.2? Even if file extension recognition isn't added, that's acceptable.

If we assume no extension support is needed, then only the following three files from this pull request would require updates:

• building/libs.xml
• project.xml
• source/openfl/utils/Assets.hx

This approach would still allow using Opus audio encoding within the .ogg container.

[Raltyro]

I was actually thinking of implementing it as a decoder so the getSound Assets function isnt a mess

quoting my reply, i might be closing this pull request so dont do anymore to the pull request
i was thinking of implementing to the libraries in the organization as a decoder so it'll be easier to implement other audio types like MiniMP3 or Drmp3 for mp3, flac, etc.

[HEIHUAa]

I was actually thinking of implementing it as a decoder so the getSound Assets function isnt a mess

quoting my reply, i might be closing this pull request so dont do anymore to the pull request i was thinking of implementing to the libraries in the organization as a decoder so it'll be easier to implement other audio types like MiniMP3 or Drmp3 for mp3, flac, etc.

Okay.