/* * Copyright (c) 2012 * MIPS Technologies, Inc., California. * * Redistribution and use in source and binary forms, with or without * modification, are permitted provided that the following conditions * are met: * 1. Redistributions of source code must retain the above copyright * notice, this list of conditions and the following disclaimer. * 2. Redistributions in binary form must reproduce the above copyright * notice, this list of conditions and the following disclaimer in the * documentation and/or other materials provided with the distribution. * 3. Neither the name of the MIPS Technologies, Inc., nor the names of its * contributors may be used to endorse or promote products derived from * this software without specific prior written permission. * * THIS SOFTWARE IS PROVIDED BY THE MIPS TECHNOLOGIES, INC. ``AS IS'' AND * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE * ARE DISCLAIMED. IN NO EVENT SHALL THE MIPS TECHNOLOGIES, INC. BE LIABLE * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF * SUCH DAMAGE. * * Author: Nedeljko Babic (nbabic@mips.com) * * 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_FIXED_DSP_H #define AVUTIL_FIXED_DSP_H #include <stdint.h> #include "attributes.h" #include "common.h" #include "libavcodec/mathops.h" typedef struct AVFixedDSPContext { /* Assume len is a multiple of 16, and arrays are 32-byte aligned */ /* Results of multiplications are scaled down by 31 bit (and rounded) if not * stated otherwise */ /** * Overlap/add with window function. * Result is scaled down by "bits" bits. * Used primarily by MDCT-based audio codecs. * Source and destination vectors must overlap exactly or not at all. * * @param dst result vector * constraints: 16-byte aligned * @param src0 first source vector * constraints: 16-byte aligned * @param src1 second source vector * constraints: 16-byte aligned * @param win half-window vector * constraints: 16-byte aligned * @param len length of vector * constraints: multiple of 4 * @param bits scaling parameter * */ void (*vector_fmul_window_scaled)(int16_t *dst, const int32_t *src0, const int32_t *src1, const int32_t *win, int len, uint8_t bits); /** * Overlap/add with window function. * Used primarily by MDCT-based audio codecs. * Source and destination vectors must overlap exactly or not at all. * * @param dst result vector * constraints: 32-byte aligned * @param src0 first source vector * constraints: 16-byte aligned * @param src1 second source vector * constraints: 16-byte aligned * @param win half-window vector * constraints: 16-byte aligned * @param len length of vector * constraints: multiple of 4 */ void (*vector_fmul_window)(int32_t *dst, const int32_t *src0, const int32_t *src1, const int32_t *win, int len); /** * Fixed-point multiplication that calculates the entry wise product of two * vectors of integers and stores the result in a vector of integers. * * @param dst output vector * constraints: 32-byte aligned * @param src0 first input vector * constraints: 32-byte aligned * @param src1 second input vector * constraints: 32-byte aligned * @param len number of elements in the input * constraints: multiple of 16 */ void (*vector_fmul)(int *dst, const int *src0, const int *src1, int len); void (*vector_fmul_reverse)(int *dst, const int *src0, const int *src1, int len); /** * Calculate the entry wise product of two vectors of integers, add a third vector of * integers and store the result in a vector of integers. * * @param dst output vector * constraints: 32-byte aligned * @param src0 first input vector * constraints: 32-byte aligned * @param src1 second input vector * constraints: 32-byte aligned * @param src2 third input vector * constraints: 32-byte aligned * @param len number of elements in the input * constraints: multiple of 16 */ void (*vector_fmul_add)(int *dst, const int *src0, const int *src1, const int *src2, int len); /** * Calculate the scalar product of two vectors of integers. * * @param v1 first vector, 16-byte aligned * @param v2 second vector, 16-byte aligned * @param len length of vectors, multiple of 4 * * @return sum of elementwise products */ int (*scalarproduct_fixed)(const int *v1, const int *v2, int len); /** * Calculate the sum and difference of two vectors of integers. * * @param v1 first input vector, sum output, 16-byte aligned * @param v2 second input vector, difference output, 16-byte aligned * @param len length of vectors, multiple of 4 */ void (*butterflies_fixed)(int *av_restrict v1, int *av_restrict v2, int len); } AVFixedDSPContext; /** * Allocate and initialize a fixed DSP context. * note: should be freed with a av_free call when no longer needed. * * @param strict setting to non-zero avoids using functions which may not be IEEE-754 compliant */ AVFixedDSPContext * avpriv_alloc_fixed_dsp(int strict); /** * Calculate the square root * * @param x input fixed point number * * @param bits format of fixed point number (32 - bits).bits * * note: input is normalized to (0, 1) fixed point value */ static av_always_inline int fixed_sqrt(int x, int bits) { int retval, bit_mask, guess, square, i; int64_t accu; int shift1 = 30 - bits; int shift2 = bits - 15; if (shift1 > 0) retval = ff_sqrt(x << shift1); else retval = ff_sqrt(x >> -shift1); if (shift2 > 0) { retval = retval << shift2; bit_mask = (1 << (shift2 - 1)); for (i=0; i<shift2; i++){ guess = retval + bit_mask; accu = (int64_t)guess * guess; square = (int)((accu + bit_mask) >> bits); if (x >= square) retval += bit_mask; bit_mask >>= 1; } } else retval >>= (-shift2); return retval; } #endif /* AVUTIL_FIXED_DSP_H */