Use ffmpeg resampling to handle non-standard sample rates #303
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@happycube - can you verify this and pull it in? Doesn't look like a change that is risky |
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When -f is specified, load the input file through ffmpeg using the aresample filter to convert to 40MHz. This means the rest of ld-decode can run at its usual sample rate, which produces better-quality results and makes testing easier in the future.
This avoids a broken-pipe warning from ffmpeg when using -l. (Strictly this will only work properly in CPython, since other implementations like PyPy don't guarantee the destructor will actually be run. Fixing this properly would mean changing the loader interface to have an explicit close() operation.)
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This seems to work pretty well - I've tried it with a number of 8fSC captures and it produces better results than running the rest of the decoder at 8fSC. It should simplify future testing as well.
The script i used to test this with a few different input formats is here.
There's probably enough loader code in lddutils to make it worth moving into a module of its own now (lddecode.loaders?).