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lavu/tx: add naive_small FFT

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The same as naive but with precomputed tables. Makes it more useful
for odd-factors we don't support yet.
This commit is contained in:
Lynne 2022-09-25 08:19:17 +02:00
parent e8a9b7b298
commit 37008dc402
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GPG Key ID: A2FEA5F03F034464
1 changed files with 61 additions and 2 deletions
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63
libavutil/tx_template.c
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@ -814,6 +814,31 @@ static const FFTXCodelet TX_NAME(ff_tx_fft_inplace_def) = {
.prio = FF_TX_PRIO_BASE,
};
static av_cold int TX_NAME(ff_tx_fft_init_naive_small)(AVTXContext *s,
const FFTXCodelet *cd,
uint64_t flags,
FFTXCodeletOptions *opts,
int len, int inv,
const void *scale)
{
const double phase = s->inv ? 2.0*M_PI/len : -2.0*M_PI/len;
if (!(s->exp = av_malloc(len*len*sizeof(*s->exp))))
return AVERROR(ENOMEM);
for (int i = 0; i < len; i++) {
for (int j = 0; j < len; j++) {
const double factor = phase*i*j;
s->exp[i*j] = (TXComplex){
RESCALE(cos(factor)),
RESCALE(sin(factor)),
};
}
}
return 0;
}
static void TX_NAME(ff_tx_fft_naive)(AVTXContext *s, void *_dst, void *_src,
ptrdiff_t stride)
{
@ -822,9 +847,9 @@ static void TX_NAME(ff_tx_fft_naive)(AVTXContext *s, void *_dst, void *_src,
const int n = s->len;
double phase = s->inv ? 2.0*M_PI/n : -2.0*M_PI/n;
for(int i = 0; i < n; i++) {
for (int i = 0; i < n; i++) {
TXComplex tmp = { 0 };
for(int j = 0; j < n; j++) {
for (int j = 0; j < n; j++) {
const double factor = phase*i*j;
const TXComplex mult = {
RESCALE(cos(factor)),
@ -839,6 +864,39 @@ static void TX_NAME(ff_tx_fft_naive)(AVTXContext *s, void *_dst, void *_src,
}
}
static void TX_NAME(ff_tx_fft_naive_small)(AVTXContext *s, void *_dst, void *_src,
ptrdiff_t stride)
{
TXComplex *src = _src;
TXComplex *dst = _dst;
const int n = s->len;
for (int i = 0; i < n; i++) {
TXComplex tmp = { 0 };
for (int j = 0; j < n; j++) {
TXComplex res;
const TXComplex mult = s->exp[i*j];
CMUL3(res, src[j], mult);
tmp.re += res.re;
tmp.im += res.im;
}
dst[i] = tmp;
}
}
static const FFTXCodelet TX_NAME(ff_tx_fft_naive_small_def) = {
.name = TX_NAME_STR("fft_naive_small"),
.function = TX_NAME(ff_tx_fft_naive_small),
.type = TX_TYPE(FFT),
.flags = AV_TX_UNALIGNED | FF_TX_OUT_OF_PLACE,
.factors[0] = TX_FACTOR_ANY,
.min_len = 2,
.max_len = 1024,
.init = TX_NAME(ff_tx_fft_init_naive_small),
.cpu_flags = FF_TX_CPU_FLAGS_ALL,
.prio = FF_TX_PRIO_MIN/2,
};
static const FFTXCodelet TX_NAME(ff_tx_fft_naive_def) = {
.name = TX_NAME_STR("fft_naive"),
.function = TX_NAME(ff_tx_fft_naive),
@ -1580,6 +1638,7 @@ const FFTXCodelet * const TX_NAME(ff_tx_codelet_list)[] = {
&TX_NAME(ff_tx_fft_pfa_9xM_def),
&TX_NAME(ff_tx_fft_pfa_15xM_def),
&TX_NAME(ff_tx_fft_naive_def),
&TX_NAME(ff_tx_fft_naive_small_def),
&TX_NAME(ff_tx_mdct_fwd_def),
&TX_NAME(ff_tx_mdct_inv_def),
&TX_NAME(ff_tx_mdct_pfa_3xM_fwd_def),