/* | |

* 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); | |

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 */ |