| /* |
| * 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 "config.h" |
| #include "attributes.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); |
| |
| void ff_fixed_dsp_init_riscv(AVFixedDSPContext *fdsp); |
| void ff_fixed_dsp_init_x86(AVFixedDSPContext *fdsp); |
| |
| /** |
| * 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 */ |
