memory buffer based file conversion about resampler

[jniemann66]

@mgood7123 yeah it's been on my to-do list for a while. Having said that, though, the performance bottleneck is the actual interpolation/decimation/convolution. I have tried reading larger blocks of data and didn't make a lot of difference to the speed, and reading the whole file is just extending the block size to it's logical conclusion. It turns out the file i/o is a fairly small percentage of the processing time.

As far as operating as a resampler as a library, this is where memory buffers make more sense than reading from a file. So I can see why you would want that.

I might be able to have a look at it over the Christmas break.

(Note: the clipping-protection mechanism writes the whole conversion to a temp file (as floating point) and then scales it down if it clipped.)

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One thing I do want to do is enable live input from a pipe, but this is pretty much the opposite of processing the whole thing in memory, and instead using small blocks to reduce latency.

[jniemann66]

Closing this, but noted for future reference.

[mgood7123]

Found a very informative video related to this, may be useful for improving realtime decoding speed (eg for streamed resampling and playback)

CPU Performance vs. Real-Time Performance in Digital Audio Workstations (DAW) https://m.youtube.com/watch?v=GUsLLEkswzE

[mgood7123]

Interesting