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205 lines
7.6 KiB
C
205 lines
7.6 KiB
C
/*
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* Copyright (c) 2012
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* MIPS Technologies, Inc., California.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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* 3. Neither the name of the MIPS Technologies, Inc., nor the names of its
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* contributors may be used to endorse or promote products derived from
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* this software without specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE MIPS TECHNOLOGIES, INC. ``AS IS'' AND
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* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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* ARE DISCLAIMED. IN NO EVENT SHALL THE MIPS TECHNOLOGIES, INC. BE LIABLE
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* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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* SUCH DAMAGE.
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*
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* Author: Nedeljko Babic (nbabic@mips.com)
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*
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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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#ifndef AVUTIL_FIXED_DSP_H
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#define AVUTIL_FIXED_DSP_H
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#include <stdint.h>
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#include "attributes.h"
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#include "common.h"
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#include "libavcodec/mathops.h"
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typedef struct AVFixedDSPContext {
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/* Assume len is a multiple of 16, and arrays are 32-byte aligned */
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/* Results of multiplications are scaled down by 31 bit (and rounded) if not
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* stated otherwise */
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/**
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* Overlap/add with window function.
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* Result is scaled down by "bits" bits.
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* Used primarily by MDCT-based audio codecs.
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* Source and destination vectors must overlap exactly or not at all.
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*
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* @param dst result vector
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* constraints: 16-byte aligned
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* @param src0 first source vector
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* constraints: 16-byte aligned
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* @param src1 second source vector
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* constraints: 16-byte aligned
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* @param win half-window vector
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* constraints: 16-byte aligned
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* @param len length of vector
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* constraints: multiple of 4
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* @param bits scaling parameter
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*
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*/
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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);
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/**
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* Overlap/add with window function.
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* Used primarily by MDCT-based audio codecs.
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* Source and destination vectors must overlap exactly or not at all.
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*
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* @param dst result vector
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* constraints: 32-byte aligned
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* @param src0 first source vector
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* constraints: 16-byte aligned
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* @param src1 second source vector
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* constraints: 16-byte aligned
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* @param win half-window vector
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* constraints: 16-byte aligned
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* @param len length of vector
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* constraints: multiple of 4
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*/
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void (*vector_fmul_window)(int32_t *dst, const int32_t *src0, const int32_t *src1, const int32_t *win, int len);
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/**
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* Fixed-point multiplication that calculates the entry wise product of two
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* vectors of integers and stores the result in a vector of integers.
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*
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* @param dst output vector
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* constraints: 32-byte aligned
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* @param src0 first input vector
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* constraints: 32-byte aligned
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* @param src1 second input vector
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* constraints: 32-byte aligned
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* @param len number of elements in the input
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* constraints: multiple of 16
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*/
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void (*vector_fmul)(int *dst, const int *src0, const int *src1,
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int len);
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void (*vector_fmul_reverse)(int *dst, const int *src0, const int *src1, int len);
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/**
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* Calculate the entry wise product of two vectors of integers, add a third vector of
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* integers and store the result in a vector of integers.
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*
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* @param dst output vector
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* constraints: 32-byte aligned
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* @param src0 first input vector
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* constraints: 32-byte aligned
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* @param src1 second input vector
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* constraints: 32-byte aligned
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* @param src2 third input vector
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* constraints: 32-byte aligned
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* @param len number of elements in the input
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* constraints: multiple of 16
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*/
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void (*vector_fmul_add)(int *dst, const int *src0, const int *src1,
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const int *src2, int len);
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/**
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* Calculate the scalar product of two vectors of integers.
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*
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* @param v1 first vector, 16-byte aligned
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* @param v2 second vector, 16-byte aligned
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* @param len length of vectors, multiple of 4
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*
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* @return sum of elementwise products
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*/
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int (*scalarproduct_fixed)(const int *v1, const int *v2, int len);
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/**
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* Calculate the sum and difference of two vectors of integers.
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*
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* @param v1 first input vector, sum output, 16-byte aligned
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* @param v2 second input vector, difference output, 16-byte aligned
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* @param len length of vectors, multiple of 4
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*/
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void (*butterflies_fixed)(int *av_restrict v1, int *av_restrict v2, int len);
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} AVFixedDSPContext;
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/**
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* Allocate and initialize a fixed DSP context.
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* note: should be freed with a av_free call when no longer needed.
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*
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* @param strict setting to non-zero avoids using functions which may not be IEEE-754 compliant
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*/
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AVFixedDSPContext * avpriv_alloc_fixed_dsp(int strict);
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void ff_fixed_dsp_init_x86(AVFixedDSPContext *fdsp);
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/**
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* Calculate the square root
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*
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* @param x input fixed point number
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*
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* @param bits format of fixed point number (32 - bits).bits
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*
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* note: input is normalized to (0, 1) fixed point value
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*/
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static av_always_inline int fixed_sqrt(int x, int bits)
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{
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int retval, bit_mask, guess, square, i;
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int64_t accu;
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int shift1 = 30 - bits;
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int shift2 = bits - 15;
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if (shift1 > 0) retval = ff_sqrt(x << shift1);
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else retval = ff_sqrt(x >> -shift1);
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if (shift2 > 0) {
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retval = retval << shift2;
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bit_mask = (1 << (shift2 - 1));
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for (i=0; i<shift2; i++){
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guess = retval + bit_mask;
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accu = (int64_t)guess * guess;
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square = (int)((accu + bit_mask) >> bits);
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if (x >= square)
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retval += bit_mask;
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bit_mask >>= 1;
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}
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}
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else retval >>= (-shift2);
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return retval;
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}
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#endif /* AVUTIL_FIXED_DSP_H */
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