[FFmpeg-devel] [PATCH 1/2] lavu/tx: rewrite internal code as a tree-based codelet constructor

[Lynne]

21 Jan 2022, 09:51 by dev at lynne.ee:

> 21 Jan 2022, 09:33 by dev at lynne.ee:
>
>> This commit rewrites the internal transform code into a constructor
>> that stitches transforms (codelets).
>> This allows for transforms to reuse arbitrary parts of other
>> transforms, and allows transforms to be stacked onto one
>> another (such as a full iMDCT using a half-iMDCT which in turn
>> uses an FFT). It also permits for each step to be individually
>> replaced by assembly or a custom implementation (such as an ASIC).
>>
>> Patch attached.
>>
>
> Forgot that I disabled double and int32 transforms to speed up
> testing, reenabled locally and on my github tx_tree branch.
> Also removed some inactive debug code.
> https://github.com/cyanreg/FFmpeg/tree/tx_tree
>

I fixed bugs and improved to code more, and I think it's ready
for merging now.
The rdft is no longer bound by any convention, and its
scale may be changed by the user, eliminating after-transform
multiplies that are used pretty much everywhere in our code.

If someone (looks at Paul) gives it a test or converts a filter,
would be nice. I've only tested it on my synthetic benchmarks:
https://github.com/cyanreg/lavu_fft_test

I plan to push the patchset tomorrow unless there are comments.
Mostly done with the aarch64's SIMD, patch coming soon, hopefully.