mirror of
https://git.ffmpeg.org/ffmpeg.git
synced 2024-12-26 01:02:33 +00:00
673 lines
20 KiB
C
673 lines
20 KiB
C
/*
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* This file is part of FFmpeg.
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*
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* FFmpeg is free software; you can redistribute it and/or
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* modify it under the terms of the GNU Lesser General Public
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* License as published by the Free Software Foundation; either
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* version 2.1 of the License, or (at your option) any later version.
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*
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* FFmpeg is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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* Lesser General Public License for more details.
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*
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* You should have received a copy of the GNU Lesser General Public
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* License along with FFmpeg; if not, write to the Free Software
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* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
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*/
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#include "cpu.h"
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#include "qsort.h"
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#include "bprint.h"
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#include "tx_priv.h"
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#define TYPE_IS(type, x) \
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(((x) == AV_TX_FLOAT_ ## type) || \
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((x) == AV_TX_DOUBLE_ ## type) || \
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((x) == AV_TX_INT32_ ## type))
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/* Calculates the modular multiplicative inverse */
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static av_always_inline int mulinv(int n, int m)
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{
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n = n % m;
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for (int x = 1; x < m; x++)
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if (((n * x) % m) == 1)
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return x;
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av_assert0(0); /* Never reached */
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return 0;
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}
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/* Guaranteed to work for any n, m where gcd(n, m) == 1 */
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int ff_tx_gen_compound_mapping(AVTXContext *s, int n, int m)
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{
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int *in_map, *out_map;
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const int inv = s->inv;
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const int len = n*m; /* Will not be equal to s->len for MDCTs */
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const int mdct = TYPE_IS(MDCT, s->type);
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int m_inv, n_inv;
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/* Make sure the numbers are coprime */
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if (av_gcd(n, m) != 1)
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return AVERROR(EINVAL);
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m_inv = mulinv(m, n);
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n_inv = mulinv(n, m);
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if (!(s->map = av_malloc(2*len*sizeof(*s->map))))
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return AVERROR(ENOMEM);
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in_map = s->map;
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out_map = s->map + len;
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/* Ruritanian map for input, CRT map for output, can be swapped */
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for (int j = 0; j < m; j++) {
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for (int i = 0; i < n; i++) {
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/* Shifted by 1 to simplify MDCTs */
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in_map[j*n + i] = ((i*m + j*n) % len) << mdct;
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out_map[(i*m*m_inv + j*n*n_inv) % len] = i*m + j;
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}
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}
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/* Change transform direction by reversing all ACs */
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if (inv) {
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for (int i = 0; i < m; i++) {
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int *in = &in_map[i*n + 1]; /* Skip the DC */
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for (int j = 0; j < ((n - 1) >> 1); j++)
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FFSWAP(int, in[j], in[n - j - 2]);
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}
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}
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/* Our 15-point transform is also a compound one, so embed its input map */
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if (n == 15) {
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for (int k = 0; k < m; k++) {
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int tmp[15];
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memcpy(tmp, &in_map[k*15], 15*sizeof(*tmp));
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for (int i = 0; i < 5; i++) {
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for (int j = 0; j < 3; j++)
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in_map[k*15 + i*3 + j] = tmp[(i*3 + j*5) % 15];
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}
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}
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}
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return 0;
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}
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static inline int split_radix_permutation(int i, int len, int inv)
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{
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len >>= 1;
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if (len <= 1)
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return i & 1;
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if (!(i & len))
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return split_radix_permutation(i, len, inv) * 2;
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len >>= 1;
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return split_radix_permutation(i, len, inv) * 4 + 1 - 2*(!(i & len) ^ inv);
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}
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int ff_tx_gen_ptwo_revtab(AVTXContext *s, int invert_lookup)
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{
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int len = s->len;
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if (!(s->map = av_malloc(len*sizeof(*s->map))))
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return AVERROR(ENOMEM);
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if (invert_lookup) {
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for (int i = 0; i < s->len; i++)
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s->map[i] = -split_radix_permutation(i, len, s->inv) & (len - 1);
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} else {
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for (int i = 0; i < s->len; i++)
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s->map[-split_radix_permutation(i, len, s->inv) & (len - 1)] = i;
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}
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return 0;
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}
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int ff_tx_gen_ptwo_inplace_revtab_idx(AVTXContext *s)
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{
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int *src_map, out_map_idx = 0, len = s->len;
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if (!s->sub || !s->sub->map)
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return AVERROR(EINVAL);
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if (!(s->map = av_mallocz(len*sizeof(*s->map))))
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return AVERROR(ENOMEM);
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src_map = s->sub->map;
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/* The first coefficient is always already in-place */
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for (int src = 1; src < s->len; src++) {
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int dst = src_map[src];
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int found = 0;
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if (dst <= src)
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continue;
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/* This just checks if a closed loop has been encountered before,
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* and if so, skips it, since to fully permute a loop we must only
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* enter it once. */
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do {
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for (int j = 0; j < out_map_idx; j++) {
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if (dst == s->map[j]) {
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found = 1;
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break;
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}
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}
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dst = src_map[dst];
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} while (dst != src && !found);
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if (!found)
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s->map[out_map_idx++] = src;
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}
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s->map[out_map_idx++] = 0;
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return 0;
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}
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static void parity_revtab_generator(int *revtab, int n, int inv, int offset,
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int is_dual, int dual_high, int len,
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int basis, int dual_stride, int inv_lookup)
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{
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len >>= 1;
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if (len <= basis) {
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int k1, k2, stride, even_idx, odd_idx;
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is_dual = is_dual && dual_stride;
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dual_high = is_dual & dual_high;
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stride = is_dual ? FFMIN(dual_stride, len) : 0;
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even_idx = offset + dual_high*(stride - 2*len);
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odd_idx = even_idx + len + (is_dual && !dual_high)*len + dual_high*len;
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for (int i = 0; i < len; i++) {
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k1 = -split_radix_permutation(offset + i*2 + 0, n, inv) & (n - 1);
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k2 = -split_radix_permutation(offset + i*2 + 1, n, inv) & (n - 1);
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if (inv_lookup) {
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revtab[even_idx++] = k1;
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revtab[odd_idx++] = k2;
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} else {
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revtab[k1] = even_idx++;
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revtab[k2] = odd_idx++;
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}
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if (stride && !((i + 1) % stride)) {
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even_idx += stride;
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odd_idx += stride;
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}
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}
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return;
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}
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parity_revtab_generator(revtab, n, inv, offset,
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0, 0, len >> 0, basis, dual_stride, inv_lookup);
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parity_revtab_generator(revtab, n, inv, offset + (len >> 0),
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1, 0, len >> 1, basis, dual_stride, inv_lookup);
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parity_revtab_generator(revtab, n, inv, offset + (len >> 0) + (len >> 1),
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1, 1, len >> 1, basis, dual_stride, inv_lookup);
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}
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int ff_tx_gen_split_radix_parity_revtab(AVTXContext *s, int invert_lookup,
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int basis, int dual_stride)
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{
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int len = s->len;
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int inv = s->inv;
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if (!(s->map = av_mallocz(len*sizeof(*s->map))))
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return AVERROR(ENOMEM);
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basis >>= 1;
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if (len < basis)
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return AVERROR(EINVAL);
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av_assert0(!dual_stride || !(dual_stride & (dual_stride - 1)));
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av_assert0(dual_stride <= basis);
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parity_revtab_generator(s->map, len, inv, 0, 0, 0, len,
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basis, dual_stride, invert_lookup);
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return 0;
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}
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static void reset_ctx(AVTXContext *s)
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{
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if (!s)
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return;
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if (s->sub)
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for (int i = 0; i < s->nb_sub; i++)
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reset_ctx(&s->sub[i]);
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if (s->cd_self->uninit)
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s->cd_self->uninit(s);
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av_freep(&s->sub);
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av_freep(&s->map);
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av_freep(&s->exp);
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av_freep(&s->tmp);
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memset(s, 0, sizeof(*s));
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}
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av_cold void av_tx_uninit(AVTXContext **ctx)
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{
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if (!(*ctx))
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return;
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reset_ctx(*ctx);
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av_freep(ctx);
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}
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static av_cold int ff_tx_null_init(AVTXContext *s, const FFTXCodelet *cd,
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uint64_t flags, FFTXCodeletOptions *opts,
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int len, int inv, const void *scale)
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{
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/* Can only handle one sample+type to one sample+type transforms */
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if (TYPE_IS(MDCT, s->type) || TYPE_IS(RDFT, s->type))
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return AVERROR(EINVAL);
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return 0;
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}
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/* Null transform when the length is 1 */
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static void ff_tx_null(AVTXContext *s, void *_out, void *_in, ptrdiff_t stride)
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{
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memcpy(_out, _in, stride);
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}
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static const FFTXCodelet ff_tx_null_def = {
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.name = NULL_IF_CONFIG_SMALL("null"),
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.function = ff_tx_null,
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.type = TX_TYPE_ANY,
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.flags = AV_TX_UNALIGNED | FF_TX_ALIGNED |
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FF_TX_OUT_OF_PLACE | AV_TX_INPLACE,
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.factors[0] = TX_FACTOR_ANY,
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.min_len = 1,
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.max_len = 1,
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.init = ff_tx_null_init,
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.cpu_flags = FF_TX_CPU_FLAGS_ALL,
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.prio = FF_TX_PRIO_MAX,
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};
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static const FFTXCodelet * const ff_tx_null_list[] = {
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&ff_tx_null_def,
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NULL,
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};
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#if !CONFIG_SMALL
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static void print_flags(AVBPrint *bp, uint64_t f)
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{
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int prev = 0;
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const char *sep = ", ";
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av_bprintf(bp, "flags: [");
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if ((f & FF_TX_ALIGNED) && ++prev)
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av_bprintf(bp, "aligned");
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if ((f & AV_TX_UNALIGNED) && ++prev)
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av_bprintf(bp, "%sunaligned", prev > 1 ? sep : "");
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if ((f & AV_TX_INPLACE) && ++prev)
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av_bprintf(bp, "%sinplace", prev > 1 ? sep : "");
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if ((f & FF_TX_OUT_OF_PLACE) && ++prev)
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av_bprintf(bp, "%sout_of_place", prev > 1 ? sep : "");
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if ((f & FF_TX_FORWARD_ONLY) && ++prev)
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av_bprintf(bp, "%sfwd_only", prev > 1 ? sep : "");
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if ((f & FF_TX_INVERSE_ONLY) && ++prev)
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av_bprintf(bp, "%sinv_only", prev > 1 ? sep : "");
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if ((f & FF_TX_PRESHUFFLE) && ++prev)
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av_bprintf(bp, "%spreshuf", prev > 1 ? sep : "");
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if ((f & AV_TX_FULL_IMDCT) && ++prev)
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av_bprintf(bp, "%simdct_full", prev > 1 ? sep : "");
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av_bprintf(bp, "]");
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}
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static void print_type(AVBPrint *bp, enum AVTXType type)
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{
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av_bprintf(bp, "%s",
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type == TX_TYPE_ANY ? "any" :
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type == AV_TX_FLOAT_FFT ? "fft_float" :
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type == AV_TX_FLOAT_MDCT ? "mdct_float" :
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type == AV_TX_FLOAT_RDFT ? "rdft_float" :
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type == AV_TX_DOUBLE_FFT ? "fft_double" :
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type == AV_TX_DOUBLE_MDCT ? "mdct_double" :
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type == AV_TX_DOUBLE_RDFT ? "rdft_double" :
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type == AV_TX_INT32_FFT ? "fft_int32" :
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type == AV_TX_INT32_MDCT ? "mdct_int32" :
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type == AV_TX_INT32_RDFT ? "rdft_int32" :
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"unknown");
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}
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static void print_cd_info(const FFTXCodelet *cd, int prio, int print_prio)
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{
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AVBPrint bp = { 0 };
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av_bprint_init(&bp, 0, AV_BPRINT_SIZE_AUTOMATIC);
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av_bprintf(&bp, "%s - type: ", cd->name);
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print_type(&bp, cd->type);
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av_bprintf(&bp, ", len: ");
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if (cd->min_len != cd->max_len)
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av_bprintf(&bp, "[%i, ", cd->min_len);
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if (cd->max_len == TX_LEN_UNLIMITED)
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av_bprintf(&bp, "∞");
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else
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av_bprintf(&bp, "%i", cd->max_len);
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av_bprintf(&bp, "%s, factors: [", cd->min_len != cd->max_len ? "]" : "");
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for (int i = 0; i < TX_MAX_SUB; i++) {
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if (i && cd->factors[i])
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av_bprintf(&bp, ", ");
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if (cd->factors[i] == TX_FACTOR_ANY)
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av_bprintf(&bp, "any");
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else if (cd->factors[i])
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av_bprintf(&bp, "%i", cd->factors[i]);
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else
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break;
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}
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av_bprintf(&bp, "], ");
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print_flags(&bp, cd->flags);
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if (print_prio)
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av_bprintf(&bp, ", prio: %i", prio);
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av_log(NULL, AV_LOG_VERBOSE, "%s\n", bp.str);
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}
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static void print_tx_structure(AVTXContext *s, int depth)
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{
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const FFTXCodelet *cd = s->cd_self;
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for (int i = 0; i <= depth; i++)
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av_log(NULL, AV_LOG_VERBOSE, " ");
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print_cd_info(cd, cd->prio, 0);
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for (int i = 0; i < s->nb_sub; i++)
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print_tx_structure(&s->sub[i], depth + 1);
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}
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#endif /* CONFIG_SMALL */
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typedef struct TXCodeletMatch {
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const FFTXCodelet *cd;
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int prio;
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} TXCodeletMatch;
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static int cmp_matches(TXCodeletMatch *a, TXCodeletMatch *b)
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{
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return FFDIFFSIGN(b->prio, a->prio);
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}
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/* We want all factors to completely cover the length */
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static inline int check_cd_factors(const FFTXCodelet *cd, int len)
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{
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int all_flag = 0;
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for (int i = 0; i < TX_MAX_SUB; i++) {
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int factor = cd->factors[i];
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/* Conditions satisfied */
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if (len == 1)
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return 1;
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/* No more factors */
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if (!factor) {
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break;
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} else if (factor == TX_FACTOR_ANY) {
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all_flag = 1;
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continue;
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}
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if (factor == 2) { /* Fast path */
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int bits_2 = ff_ctz(len);
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if (!bits_2)
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return 0; /* Factor not supported */
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len >>= bits_2;
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} else {
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int res = len % factor;
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if (res)
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return 0; /* Factor not supported */
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while (!res) {
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len /= factor;
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res = len % factor;
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}
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}
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}
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return all_flag || (len == 1);
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}
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av_cold int ff_tx_init_subtx(AVTXContext *s, enum AVTXType type,
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uint64_t flags, FFTXCodeletOptions *opts,
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int len, int inv, const void *scale)
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{
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int ret = 0;
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AVTXContext *sub = NULL;
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TXCodeletMatch *cd_tmp, *cd_matches = NULL;
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unsigned int cd_matches_size = 0;
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int nb_cd_matches = 0;
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#if !CONFIG_SMALL
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AVBPrint bp = { 0 };
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#endif
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/* Array of all compiled codelet lists. Order is irrelevant. */
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const FFTXCodelet * const * const codelet_list[] = {
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ff_tx_codelet_list_float_c,
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ff_tx_codelet_list_double_c,
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ff_tx_codelet_list_int32_c,
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ff_tx_null_list,
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#if HAVE_X86ASM
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ff_tx_codelet_list_float_x86,
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#endif
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};
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int codelet_list_num = FF_ARRAY_ELEMS(codelet_list);
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/* We still accept functions marked with SLOW, even if the CPU is
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* marked with the same flag, but we give them lower priority. */
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const int cpu_flags = av_get_cpu_flags();
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const int slow_mask = AV_CPU_FLAG_SSE2SLOW | AV_CPU_FLAG_SSE3SLOW |
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AV_CPU_FLAG_ATOM | AV_CPU_FLAG_SSSE3SLOW |
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AV_CPU_FLAG_AVXSLOW | AV_CPU_FLAG_SLOW_GATHER;
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/* Flags the transform wants */
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uint64_t req_flags = flags;
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/* Flags the codelet may require to be present */
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uint64_t inv_req_mask = AV_TX_FULL_IMDCT | FF_TX_PRESHUFFLE;
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/* Unaligned codelets are compatible with the aligned flag */
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if (req_flags & FF_TX_ALIGNED)
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req_flags |= AV_TX_UNALIGNED;
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/* If either flag is set, both are okay, so don't check for an exact match */
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if ((req_flags & AV_TX_INPLACE) && (req_flags & FF_TX_OUT_OF_PLACE))
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req_flags &= ~(AV_TX_INPLACE | FF_TX_OUT_OF_PLACE);
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if ((req_flags & FF_TX_ALIGNED) && (req_flags & AV_TX_UNALIGNED))
|
|
req_flags &= ~(FF_TX_ALIGNED | AV_TX_UNALIGNED);
|
|
|
|
/* Loop through all codelets in all codelet lists to find matches
|
|
* to the requirements */
|
|
while (codelet_list_num--) {
|
|
const FFTXCodelet * const * list = codelet_list[codelet_list_num];
|
|
const FFTXCodelet *cd = NULL;
|
|
|
|
while ((cd = *list++)) {
|
|
int max_factor = 0;
|
|
|
|
/* Check if the type matches */
|
|
if (cd->type != TX_TYPE_ANY && type != cd->type)
|
|
continue;
|
|
|
|
/* Check direction for non-orthogonal codelets */
|
|
if (((cd->flags & FF_TX_FORWARD_ONLY) && inv) ||
|
|
((cd->flags & (FF_TX_INVERSE_ONLY | AV_TX_FULL_IMDCT)) && !inv))
|
|
continue;
|
|
|
|
/* Check if the requested flags match from both sides */
|
|
if (((req_flags & cd->flags) != (req_flags)) ||
|
|
((inv_req_mask & cd->flags) != (req_flags & inv_req_mask)))
|
|
continue;
|
|
|
|
/* Check if length is supported */
|
|
if ((len < cd->min_len) || (cd->max_len != -1 && (len > cd->max_len)))
|
|
continue;
|
|
|
|
/* Check if the CPU supports the required ISA */
|
|
if (cd->cpu_flags != FF_TX_CPU_FLAGS_ALL &&
|
|
!(cpu_flags & (cd->cpu_flags & ~slow_mask)))
|
|
continue;
|
|
|
|
/* Check for factors */
|
|
if (!check_cd_factors(cd, len))
|
|
continue;
|
|
|
|
/* Realloc array and append */
|
|
cd_tmp = av_fast_realloc(cd_matches, &cd_matches_size,
|
|
sizeof(*cd_tmp) * (nb_cd_matches + 1));
|
|
if (!cd_tmp) {
|
|
av_free(cd_matches);
|
|
return AVERROR(ENOMEM);
|
|
}
|
|
|
|
cd_matches = cd_tmp;
|
|
cd_matches[nb_cd_matches].cd = cd;
|
|
cd_matches[nb_cd_matches].prio = cd->prio;
|
|
|
|
/* If the CPU has a SLOW flag, and the instruction is also flagged
|
|
* as being slow for such, reduce its priority */
|
|
if ((cpu_flags & cd->cpu_flags) & slow_mask)
|
|
cd_matches[nb_cd_matches].prio -= 64;
|
|
|
|
/* Prioritize aligned-only codelets */
|
|
if ((cd->flags & FF_TX_ALIGNED) && !(cd->flags & AV_TX_UNALIGNED))
|
|
cd_matches[nb_cd_matches].prio += 64;
|
|
|
|
/* Codelets for specific lengths are generally faster */
|
|
if ((len == cd->min_len) && (len == cd->max_len))
|
|
cd_matches[nb_cd_matches].prio += 64;
|
|
|
|
/* Forward-only or inverse-only transforms are generally better */
|
|
if ((cd->flags & (FF_TX_FORWARD_ONLY | FF_TX_INVERSE_ONLY)))
|
|
cd_matches[nb_cd_matches].prio += 64;
|
|
|
|
/* Larger factors are generally better */
|
|
for (int i = 0; i < TX_MAX_SUB; i++)
|
|
max_factor = FFMAX(cd->factors[i], max_factor);
|
|
if (max_factor)
|
|
cd_matches[nb_cd_matches].prio += 16*max_factor;
|
|
|
|
nb_cd_matches++;
|
|
}
|
|
}
|
|
|
|
#if !CONFIG_SMALL
|
|
/* Print debugging info */
|
|
av_bprint_init(&bp, 0, AV_BPRINT_SIZE_AUTOMATIC);
|
|
av_bprintf(&bp, "For transform of length %i, %s, ", len,
|
|
inv ? "inverse" : "forward");
|
|
print_type(&bp, type);
|
|
av_bprintf(&bp, ", ");
|
|
print_flags(&bp, flags);
|
|
av_bprintf(&bp, ", found %i matches%s", nb_cd_matches,
|
|
nb_cd_matches ? ":" : ".");
|
|
#endif
|
|
|
|
/* No matches found */
|
|
if (!nb_cd_matches)
|
|
return AVERROR(ENOSYS);
|
|
|
|
/* Sort the list */
|
|
AV_QSORT(cd_matches, nb_cd_matches, TXCodeletMatch, cmp_matches);
|
|
|
|
#if !CONFIG_SMALL
|
|
av_log(NULL, AV_LOG_VERBOSE, "%s\n", bp.str);
|
|
|
|
for (int i = 0; i < nb_cd_matches; i++) {
|
|
av_log(NULL, AV_LOG_VERBOSE, " %i: ", i + 1);
|
|
print_cd_info(cd_matches[i].cd, cd_matches[i].prio, 1);
|
|
}
|
|
#endif
|
|
|
|
if (!s->sub) {
|
|
s->sub = sub = av_mallocz(TX_MAX_SUB*sizeof(*sub));
|
|
if (!sub) {
|
|
ret = AVERROR(ENOMEM);
|
|
goto end;
|
|
}
|
|
}
|
|
|
|
/* Attempt to initialize each */
|
|
for (int i = 0; i < nb_cd_matches; i++) {
|
|
const FFTXCodelet *cd = cd_matches[i].cd;
|
|
AVTXContext *sctx = &s->sub[s->nb_sub];
|
|
|
|
sctx->len = len;
|
|
sctx->inv = inv;
|
|
sctx->type = type;
|
|
sctx->flags = flags;
|
|
sctx->cd_self = cd;
|
|
|
|
s->fn[s->nb_sub] = cd->function;
|
|
s->cd[s->nb_sub] = cd;
|
|
|
|
ret = 0;
|
|
if (cd->init)
|
|
ret = cd->init(sctx, cd, flags, opts, len, inv, scale);
|
|
|
|
if (ret >= 0) {
|
|
s->nb_sub++;
|
|
goto end;
|
|
}
|
|
|
|
s->fn[s->nb_sub] = NULL;
|
|
s->cd[s->nb_sub] = NULL;
|
|
|
|
reset_ctx(sctx);
|
|
if (ret == AVERROR(ENOMEM))
|
|
break;
|
|
}
|
|
|
|
if (!s->nb_sub)
|
|
av_freep(&s->sub);
|
|
|
|
end:
|
|
av_free(cd_matches);
|
|
return ret;
|
|
}
|
|
|
|
av_cold int av_tx_init(AVTXContext **ctx, av_tx_fn *tx, enum AVTXType type,
|
|
int inv, int len, const void *scale, uint64_t flags)
|
|
{
|
|
int ret;
|
|
AVTXContext tmp = { 0 };
|
|
const double default_scale_d = 1.0;
|
|
const float default_scale_f = 1.0f;
|
|
|
|
if (!len || type >= AV_TX_NB || !ctx || !tx)
|
|
return AVERROR(EINVAL);
|
|
|
|
if (!(flags & AV_TX_UNALIGNED))
|
|
flags |= FF_TX_ALIGNED;
|
|
if (!(flags & AV_TX_INPLACE))
|
|
flags |= FF_TX_OUT_OF_PLACE;
|
|
|
|
if (!scale && ((type == AV_TX_FLOAT_MDCT) || (type == AV_TX_INT32_MDCT)))
|
|
scale = &default_scale_f;
|
|
else if (!scale && (type == AV_TX_DOUBLE_MDCT))
|
|
scale = &default_scale_d;
|
|
|
|
ret = ff_tx_init_subtx(&tmp, type, flags, NULL, len, inv, scale);
|
|
if (ret < 0)
|
|
return ret;
|
|
|
|
*ctx = &tmp.sub[0];
|
|
*tx = tmp.fn[0];
|
|
|
|
#if !CONFIG_SMALL
|
|
av_log(NULL, AV_LOG_VERBOSE, "Transform tree:\n");
|
|
print_tx_structure(*ctx, 0);
|
|
#endif
|
|
|
|
return ret;
|
|
}
|