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+/*
+ * 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 */