/* * This file is part of FFmpeg. * * FFmpeg is free software; you can redistribute it and/or * modify it under the terms of the GNU Lesser General Public * License as published by the Free Software Foundation; either * version 2.1 of the License, or (at your option) any later version. * * FFmpeg is distributed in the hope that it will be useful, * but WITHOUT ANY WARRANTY; without even the implied warranty of * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU * Lesser General Public License for more details. * * You should have received a copy of the GNU Lesser General Public * License along with FFmpeg; if not, write to the Free Software * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA */ #ifndef AVUTIL_TX_PRIV_H #define AVUTIL_TX_PRIV_H #include "tx.h" #include "thread.h" #include "mem_internal.h" #include "avassert.h" #include "attributes.h" #ifdef TX_FLOAT #define TX_NAME(x) x ## _float #define SCALE_TYPE float typedef float FFTSample; typedef AVComplexFloat FFTComplex; #elif defined(TX_DOUBLE) #define TX_NAME(x) x ## _double #define SCALE_TYPE double typedef double FFTSample; typedef AVComplexDouble FFTComplex; #elif defined(TX_INT32) #define TX_NAME(x) x ## _int32 #define SCALE_TYPE float typedef int32_t FFTSample; typedef AVComplexInt32 FFTComplex; #else typedef void FFTComplex; #endif #if defined(TX_FLOAT) || defined(TX_DOUBLE) #define CMUL(dre, dim, are, aim, bre, bim) \ do { \ (dre) = (are) * (bre) - (aim) * (bim); \ (dim) = (are) * (bim) + (aim) * (bre); \ } while (0) #define SMUL(dre, dim, are, aim, bre, bim) \ do { \ (dre) = (are) * (bre) - (aim) * (bim); \ (dim) = (are) * (bim) - (aim) * (bre); \ } while (0) #define UNSCALE(x) (x) #define RESCALE(x) (x) #define FOLD(a, b) ((a) + (b)) #elif defined(TX_INT32) /* Properly rounds the result */ #define CMUL(dre, dim, are, aim, bre, bim) \ do { \ int64_t accu; \ (accu) = (int64_t)(bre) * (are); \ (accu) -= (int64_t)(bim) * (aim); \ (dre) = (int)(((accu) + 0x40000000) >> 31); \ (accu) = (int64_t)(bim) * (are); \ (accu) += (int64_t)(bre) * (aim); \ (dim) = (int)(((accu) + 0x40000000) >> 31); \ } while (0) #define SMUL(dre, dim, are, aim, bre, bim) \ do { \ int64_t accu; \ (accu) = (int64_t)(bre) * (are); \ (accu) -= (int64_t)(bim) * (aim); \ (dre) = (int)(((accu) + 0x40000000) >> 31); \ (accu) = (int64_t)(bim) * (are); \ (accu) -= (int64_t)(bre) * (aim); \ (dim) = (int)(((accu) + 0x40000000) >> 31); \ } while (0) #define UNSCALE(x) ((double)x/2147483648.0) #define RESCALE(x) (av_clip64(lrintf((x) * 2147483648.0), INT32_MIN, INT32_MAX)) #define FOLD(x, y) ((int)((x) + (unsigned)(y) + 32) >> 6) #endif #define BF(x, y, a, b) \ do { \ x = (a) - (b); \ y = (a) + (b); \ } while (0) #define CMUL3(c, a, b) \ CMUL((c).re, (c).im, (a).re, (a).im, (b).re, (b).im) #define COSTABLE(size) \ DECLARE_ALIGNED(32, FFTSample, TX_NAME(ff_cos_##size))[size/4 + 1] /* Used by asm, reorder with care */ struct AVTXContext { int n; /* Non-power-of-two part */ int m; /* Power-of-two part */ int inv; /* Is inverse */ int type; /* Type */ uint64_t flags; /* Flags */ double scale; /* Scale */ FFTComplex *exptab; /* MDCT exptab */ FFTComplex *tmp; /* Temporary buffer needed for all compound transforms */ int *pfatab; /* Input/Output mapping for compound transforms */ int *revtab; /* Input mapping for power of two transforms */ int *inplace_idx; /* Required indices to revtab for in-place transforms */ int *revtab_c; /* Revtab for only the C transforms, needed because * checkasm makes us reuse the same context. */ av_tx_fn top_tx; /* Used for computing transforms derived from other * transforms, like full-length iMDCTs and RDFTs. * NOTE: Do NOT use this to mix assembly with C code. */ }; /* Checks if type is an MDCT */ int ff_tx_type_is_mdct(enum AVTXType type); /* * Generates the PFA permutation table into AVTXContext->pfatab. The end table * is appended to the start table. */ int ff_tx_gen_compound_mapping(AVTXContext *s); /* * Generates a standard-ish (slightly modified) Split-Radix revtab into * AVTXContext->revtab */ int ff_tx_gen_ptwo_revtab(AVTXContext *s, int invert_lookup); /* * Generates an index into AVTXContext->inplace_idx that if followed in the * specific order, allows the revtab to be done in-place. AVTXContext->revtab * must already exist. */ int ff_tx_gen_ptwo_inplace_revtab_idx(AVTXContext *s, int *revtab); /* * This generates a parity-based revtab of length len and direction inv. * * Parity means even and odd complex numbers will be split, e.g. the even * coefficients will come first, after which the odd coefficients will be * placed. For example, a 4-point transform's coefficients after reordering: * z[0].re, z[0].im, z[2].re, z[2].im, z[1].re, z[1].im, z[3].re, z[3].im * * The basis argument is the length of the largest non-composite transform * supported, and also implies that the basis/2 transform is supported as well, * as the split-radix algorithm requires it to be. * * The dual_stride argument indicates that both the basis, as well as the * basis/2 transforms support doing two transforms at once, and the coefficients * will be interleaved between each pair in a split-radix like so (stride == 2): * tx1[0], tx1[2], tx2[0], tx2[2], tx1[1], tx1[3], tx2[1], tx2[3] * A non-zero number switches this on, with the value indicating the stride * (how many values of 1 transform to put first before switching to the other). * Must be a power of two or 0. Must be less than the basis. * Value will be clipped to the transform size, so for a basis of 16 and a * dual_stride of 8, dual 8-point transforms will be laid out as if dual_stride * was set to 4. * Usually you'll set this to half the complex numbers that fit in a single * register or 0. This allows to reuse SSE functions as dual-transform * functions in AVX mode. * * If length is smaller than basis/2 this function will not do anything. */ void ff_tx_gen_split_radix_parity_revtab(int *revtab, int len, int inv, int basis, int dual_stride); /* Templated init functions */ int ff_tx_init_mdct_fft_float(AVTXContext *s, av_tx_fn *tx, enum AVTXType type, int inv, int len, const void *scale, uint64_t flags); int ff_tx_init_mdct_fft_double(AVTXContext *s, av_tx_fn *tx, enum AVTXType type, int inv, int len, const void *scale, uint64_t flags); int ff_tx_init_mdct_fft_int32(AVTXContext *s, av_tx_fn *tx, enum AVTXType type, int inv, int len, const void *scale, uint64_t flags); typedef struct CosTabsInitOnce { void (*func)(void); AVOnce control; } CosTabsInitOnce; #endif /* AVUTIL_TX_PRIV_H */