* Swift overlay to vDSP cascaded biquad IIR filter.
* update comment in test
* Swift overlay to vDSP Discrete Cosine Transform
* Swift Overlays to vDSP Fast Fourier Transform and Discrete Fourier Transform
* Tests for DFT and FFT
* Some refactoring and begin documentation.
* Swift overlays to FFT and DFT operations.
* Expand docs.
* Implement `vDSP_destroy_fftsetup` and `vDSP_destroy_fftsetupD`
* Refactor Tests
* Refactor Tests
* Provide transform function that returns the result. Refactoring: parameter names more consistent with other vDSP operations, push `fileprivate` symbols to bottom of file.
* Add apply() function that returns the result.
* Added a version of DFT transform that returns the result.
* update some DFT comments
* Remove FFT overlays from this branch to separate DFT and FFT pull requests.
* [Accelerate] [vDSP] Swift Overlays to FFT Operations
This PR contains Swift overlays to simplify performing 1D and 2D fast Fourier transforms on single- and double-precision data.
This PR includes a subset of the operations (e.g. vDSP_fft_zrop for FFT). My plan is to add the additional operations (e.g. multiple signals, in-place operations, etc.) in a subsequent PR once this is approved.
cc: @moiseev @airspeedswift @stephentyrone
* Composite Branch
Contains FFT, DFT, DCT, and Biquad branches.
* Add missing cast to new vDSP_FIR overlay.
* Use macOS instead of OSX in availability annotations.
* Reorder Accelerate/CMakeLists.txt alphabetically.
