torchaudio.load to optionally accept a target sample_rate (and maybe backend=) #2586
Description
🚀 The feature
E.g. OPUS format supports resampling as part of reading. There is no standard and uniform way of setting sample rate at decoding.
E.g. sox sets it always as 48khz: https://github.com/dmkrepo/libsox/blob/master/src/opus.c#L114 (unofficial repo)
while original opusdec itself tries to first copy it from original source sample rate stored in stream header: https://github.com/xiph/opus-tools/blob/master/src/opusdec.c#L897
Fixing sox to do what opusdec does probably should be a feature request to sox and to ffmpeg. But probably torchaudio should support passing some forced sample_rate and built-in resampling if decoder supports it
It may also be a good idea to directly accept a backend= argument as well. This would avoid maintaining it as a global variable and eliminate the need for dataloader worker init code for setting the backend. (Personally, I would even think that the global variable should be phased out in favor of an explicit argument with a default argument)
Motivation, pitch
N/A
Alternatives
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Additional context
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