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| author | Lynne <dev@lynne.ee> | 2022-09-24 06:50:17 +0200 |
|---|---|---|
| committer | Lynne <dev@lynne.ee> | 2022-11-24 15:58:28 +0100 |
| commit | e8a9b7b29877db9e3887562007df7a53325b67d1 (patch) | |
| tree | a19ea9a3b3e8b0c3297069833e81e671dbbae397 | |
| parent | 45bd4bf79f9b69ac4cec1bd00c433407b3aa7ae4 (diff) | |
| download | ffmpeg-e8a9b7b29877db9e3887562007df7a53325b67d1.tar.gz | |
lavu/tx: list all odd-length FFT factors as regular codelets
Allows them to be picked just like any other transform.
| -rw-r--r-- | libavutil/tx_template.c | 88 |
1 files changed, 88 insertions, 0 deletions
diff --git a/libavutil/tx_template.c b/libavutil/tx_template.c index b547800447..d72281f09c 100644 --- a/libavutil/tx_template.c +++ b/libavutil/tx_template.c @@ -472,6 +472,81 @@ static av_always_inline void fft15(TXComplex *out, TXComplex *in, fft5_m3(out, tmp + 10, stride); } +static av_cold int TX_NAME(ff_tx_fft_factor_init)(AVTXContext *s, + const FFTXCodelet *cd, + uint64_t flags, + FFTXCodeletOptions *opts, + int len, int inv, + const void *scale) +{ + TX_TAB(ff_tx_init_tabs)(len); + + if (flags & FF_TX_PRESHUFFLE) { + s->map = av_malloc(len*sizeof(s->map)); + s->map[0] = 0; /* DC is always at the start */ + if (inv) /* Reversing the ACs flips the transform direction */ + for (int i = 1; i < len; i++) + s->map[i] = len - i; + else + for (int i = 1; i < len; i++) + s->map[i] = i; + } + + /* Our 15-point transform is actually a 5x3 PFA, so embed its input map. */ + if (len == 15) { + int tmp[15]; + memcpy(tmp, s->map, 15*sizeof(*tmp)); + for (int i = 0; i < 5; i++) { + for (int j = 0; j < 3; j++) + s->map[i*3 + j] = tmp[(i*3 + j*5) % 15]; + } + } + + return 0; +} + +#define DECL_FACTOR_S(n) \ +static void TX_NAME(ff_tx_fft##n)(AVTXContext *s, void *dst, \ + void *src, ptrdiff_t stride) \ +{ \ + fft##n((TXComplex *)dst, (TXComplex *)src, stride / sizeof(TXComplex)); \ +} \ +static const FFTXCodelet TX_NAME(ff_tx_fft##n##_ns_def) = { \ + .name = TX_NAME_STR("fft" #n "_ns"), \ + .function = TX_NAME(ff_tx_fft##n), \ + .type = TX_TYPE(FFT), \ + .flags = AV_TX_INPLACE | FF_TX_OUT_OF_PLACE | \ + AV_TX_UNALIGNED | FF_TX_PRESHUFFLE, \ + .factors[0] = n, \ + .min_len = n, \ + .max_len = n, \ + .init = TX_NAME(ff_tx_fft_factor_init), \ + .cpu_flags = FF_TX_CPU_FLAGS_ALL, \ + .prio = FF_TX_PRIO_BASE, \ +}; + +#define DECL_FACTOR_F(n) \ +DECL_FACTOR_S(n) \ +static const FFTXCodelet TX_NAME(ff_tx_fft##n##_fwd_def) = { \ + .name = TX_NAME_STR("fft" #n "_fwd"), \ + .function = TX_NAME(ff_tx_fft##n), \ + .type = TX_TYPE(FFT), \ + .flags = AV_TX_INPLACE | FF_TX_OUT_OF_PLACE | \ + AV_TX_UNALIGNED | FF_TX_FORWARD_ONLY, \ + .factors[0] = n, \ + .min_len = n, \ + .max_len = n, \ + .init = TX_NAME(ff_tx_fft_factor_init), \ + .cpu_flags = FF_TX_CPU_FLAGS_ALL, \ + .prio = FF_TX_PRIO_BASE, \ +}; + +DECL_FACTOR_F(3) +DECL_FACTOR_F(5) +DECL_FACTOR_F(7) +DECL_FACTOR_F(9) +DECL_FACTOR_S(15) + #define BUTTERFLIES(a0, a1, a2, a3) \ do { \ r0=a0.re; \ @@ -1483,6 +1558,19 @@ const FFTXCodelet * const TX_NAME(ff_tx_codelet_list)[] = { &TX_NAME(ff_tx_fft65536_ns_def), &TX_NAME(ff_tx_fft131072_ns_def), + /* Prime factor codelets */ + &TX_NAME(ff_tx_fft3_ns_def), + &TX_NAME(ff_tx_fft5_ns_def), + &TX_NAME(ff_tx_fft7_ns_def), + &TX_NAME(ff_tx_fft9_ns_def), + &TX_NAME(ff_tx_fft15_ns_def), + + /* We get these for free */ + &TX_NAME(ff_tx_fft3_fwd_def), + &TX_NAME(ff_tx_fft5_fwd_def), + &TX_NAME(ff_tx_fft7_fwd_def), + &TX_NAME(ff_tx_fft9_fwd_def), + /* Standalone transforms */ &TX_NAME(ff_tx_fft_def), &TX_NAME(ff_tx_fft_inplace_def), |