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[Visualizer] Align memory allocations for DFT 

DFT should use aligned memory blocks for best results. Also allocate one
extra sample for DFT output, just in case DFT zop is as bad as zrop.

Signed-off-by: Christopher Snowhill <kode54@gmail.com>
swiftingly
Christopher Snowhill 2022-06-11 03:33:42 -07:00
parent 6c733762d3
commit 7cac6625d9
1 changed files with 17 additions and 6 deletions
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23
Audio/ThirdParty/deadbeef/fft_accelerate.c vendored
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@ -34,17 +34,28 @@ static float *_sq_mags;
static vDSP_DFT_Setup _dft_setup;
// Apparently _mm_malloc is Intel-only on newer macOS targets, so use supported posix_memalign
static void *_memalign_calloc(size_t count, size_t size, size_t align) {
size *= count;
void *ret = NULL;
if(posix_memalign(&ret, align, size) != 0) {
return NULL;
}
bzero(ret, size);
return ret;
}
static void
_init_buffers(int fft_size) {
if(fft_size != _fft_size) {
fft_free();
_input_real = calloc(fft_size * 2, sizeof(float));
_input_imaginary = calloc(fft_size * 2, sizeof(float));
_hamming = calloc(fft_size * 2, sizeof(float));
_sq_mags = calloc(fft_size, sizeof(float));
_output_real = calloc(fft_size * 2, sizeof(float));
_output_imaginary = calloc(fft_size * 2, sizeof(float));
_input_real = _memalign_calloc(fft_size * 2, sizeof(float), 16);
_input_imaginary = _memalign_calloc(fft_size * 2, sizeof(float), 16);
_hamming = _memalign_calloc(fft_size * 2, sizeof(float), 16);
_sq_mags = _memalign_calloc(fft_size, sizeof(float), 16);
_output_real = _memalign_calloc(fft_size * 2 + 1, sizeof(float), 16);
_output_imaginary = _memalign_calloc(fft_size * 2 + 1, sizeof(float), 16);
_dft_setup = vDSP_DFT_zop_CreateSetup(NULL, fft_size * 2, FFT_FORWARD);
vDSP_hamm_window(_hamming, fft_size * 2, 0);