🚀 Feature Request: Opus audio format support

[zhukovaes]

🚀 Feature

Add opus format

Motivation

Opus is a good and popular lossy audio coding format. A lot of audio files are stored in opus format but it's impossible to use it with torchaudio.load().

Pitch

Please, make possible to do
audio = torchaudio.load("my_audio.opus")

[mthrok]

Hi @zhukovaes

Thanks for bringing up the request.
How are you installing torchaudio and which backend are you using?
I see two possible solutions;

1. If you have sox with opus support in your system, building torchaudio's C++ extension from source and making it depend on external libsox should allow you to use opus file.
2. Similarly, if you have libsndfile with opus support in your system, switching to soundfile backend will do.
   Please refer to README for the instruction for building from source and backend. If something is not clear feel free to ask further questions.

If you are using binary distributions of torchaudio, the best way to bring opus support is your contribution to add support for it. Currently, we use this script to build libsox statically with support for lame, libmad and flac. If you can successfully modify this script to add opus support, and open a PR, we can review it.

[mthrok]

Opus support has been added. Nightly build and coming 0.6.0 should support it.