blob: f554cb5038319a45f564b4d89e0887ea6623ce4b
1 | /* |
2 | * Copyright (c) 2012 |
3 | * MIPS Technologies, Inc., California. |
4 | * |
5 | * Redistribution and use in source and binary forms, with or without |
6 | * modification, are permitted provided that the following conditions |
7 | * are met: |
8 | * 1. Redistributions of source code must retain the above copyright |
9 | * notice, this list of conditions and the following disclaimer. |
10 | * 2. Redistributions in binary form must reproduce the above copyright |
11 | * notice, this list of conditions and the following disclaimer in the |
12 | * documentation and/or other materials provided with the distribution. |
13 | * 3. Neither the name of the MIPS Technologies, Inc., nor the names of its |
14 | * contributors may be used to endorse or promote products derived from |
15 | * this software without specific prior written permission. |
16 | * |
17 | * THIS SOFTWARE IS PROVIDED BY THE MIPS TECHNOLOGIES, INC. ``AS IS'' AND |
18 | * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE |
19 | * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE |
20 | * ARE DISCLAIMED. IN NO EVENT SHALL THE MIPS TECHNOLOGIES, INC. BE LIABLE |
21 | * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL |
22 | * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS |
23 | * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) |
24 | * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT |
25 | * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY |
26 | * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF |
27 | * SUCH DAMAGE. |
28 | * |
29 | * Author: Nedeljko Babic (nbabic@mips.com) |
30 | * |
31 | * This file is part of FFmpeg. |
32 | * |
33 | * FFmpeg is free software; you can redistribute it and/or |
34 | * modify it under the terms of the GNU Lesser General Public |
35 | * License as published by the Free Software Foundation; either |
36 | * version 2.1 of the License, or (at your option) any later version. |
37 | * |
38 | * FFmpeg is distributed in the hope that it will be useful, |
39 | * but WITHOUT ANY WARRANTY; without even the implied warranty of |
40 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU |
41 | * Lesser General Public License for more details. |
42 | * |
43 | * You should have received a copy of the GNU Lesser General Public |
44 | * License along with FFmpeg; if not, write to the Free Software |
45 | * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA |
46 | */ |
47 | |
48 | #ifndef AVUTIL_FIXED_DSP_H |
49 | #define AVUTIL_FIXED_DSP_H |
50 | |
51 | #include <stdint.h> |
52 | #include "attributes.h" |
53 | #include "common.h" |
54 | #include "libavcodec/mathops.h" |
55 | |
56 | typedef struct AVFixedDSPContext { |
57 | /* Assume len is a multiple of 16, and arrays are 32-byte aligned */ |
58 | /* Results of multiplications are scaled down by 31 bit (and rounded) if not |
59 | * stated otherwise */ |
60 | |
61 | /** |
62 | * Overlap/add with window function. |
63 | * Result is scaled down by "bits" bits. |
64 | * Used primarily by MDCT-based audio codecs. |
65 | * Source and destination vectors must overlap exactly or not at all. |
66 | * |
67 | * @param dst result vector |
68 | * constraints: 16-byte aligned |
69 | * @param src0 first source vector |
70 | * constraints: 16-byte aligned |
71 | * @param src1 second source vector |
72 | * constraints: 16-byte aligned |
73 | * @param win half-window vector |
74 | * constraints: 16-byte aligned |
75 | * @param len length of vector |
76 | * constraints: multiple of 4 |
77 | * @param bits scaling parameter |
78 | * |
79 | */ |
80 | 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); |
81 | |
82 | /** |
83 | * Overlap/add with window function. |
84 | * Used primarily by MDCT-based audio codecs. |
85 | * Source and destination vectors must overlap exactly or not at all. |
86 | * |
87 | * @param dst result vector |
88 | * constraints: 32-byte aligned |
89 | * @param src0 first source vector |
90 | * constraints: 16-byte aligned |
91 | * @param src1 second source vector |
92 | * constraints: 16-byte aligned |
93 | * @param win half-window vector |
94 | * constraints: 16-byte aligned |
95 | * @param len length of vector |
96 | * constraints: multiple of 4 |
97 | */ |
98 | void (*vector_fmul_window)(int32_t *dst, const int32_t *src0, const int32_t *src1, const int32_t *win, int len); |
99 | |
100 | /** |
101 | * Fixed-point multiplication that calculates the entry wise product of two |
102 | * vectors of integers and stores the result in a vector of integers. |
103 | * |
104 | * @param dst output vector |
105 | * constraints: 32-byte aligned |
106 | * @param src0 first input vector |
107 | * constraints: 32-byte aligned |
108 | * @param src1 second input vector |
109 | * constraints: 32-byte aligned |
110 | * @param len number of elements in the input |
111 | * constraints: multiple of 16 |
112 | */ |
113 | void (*vector_fmul)(int *dst, const int *src0, const int *src1, |
114 | int len); |
115 | |
116 | void (*vector_fmul_reverse)(int *dst, const int *src0, const int *src1, int len); |
117 | /** |
118 | * Calculate the entry wise product of two vectors of integers, add a third vector of |
119 | * integers and store the result in a vector of integers. |
120 | * |
121 | * @param dst output vector |
122 | * constraints: 32-byte aligned |
123 | * @param src0 first input vector |
124 | * constraints: 32-byte aligned |
125 | * @param src1 second input vector |
126 | * constraints: 32-byte aligned |
127 | * @param src2 third input vector |
128 | * constraints: 32-byte aligned |
129 | * @param len number of elements in the input |
130 | * constraints: multiple of 16 |
131 | */ |
132 | void (*vector_fmul_add)(int *dst, const int *src0, const int *src1, |
133 | const int *src2, int len); |
134 | |
135 | /** |
136 | * Calculate the scalar product of two vectors of integers. |
137 | * |
138 | * @param v1 first vector, 16-byte aligned |
139 | * @param v2 second vector, 16-byte aligned |
140 | * @param len length of vectors, multiple of 4 |
141 | * |
142 | * @return sum of elementwise products |
143 | */ |
144 | int (*scalarproduct_fixed)(const int *v1, const int *v2, int len); |
145 | |
146 | /** |
147 | * Calculate the sum and difference of two vectors of integers. |
148 | * |
149 | * @param v1 first input vector, sum output, 16-byte aligned |
150 | * @param v2 second input vector, difference output, 16-byte aligned |
151 | * @param len length of vectors, multiple of 4 |
152 | */ |
153 | void (*butterflies_fixed)(int *av_restrict v1, int *av_restrict v2, int len); |
154 | } AVFixedDSPContext; |
155 | |
156 | /** |
157 | * Allocate and initialize a fixed DSP context. |
158 | * note: should be freed with a av_free call when no longer needed. |
159 | * |
160 | * @param strict setting to non-zero avoids using functions which may not be IEEE-754 compliant |
161 | */ |
162 | AVFixedDSPContext * avpriv_alloc_fixed_dsp(int strict); |
163 | |
164 | void ff_fixed_dsp_init_x86(AVFixedDSPContext *fdsp); |
165 | |
166 | /** |
167 | * Calculate the square root |
168 | * |
169 | * @param x input fixed point number |
170 | * |
171 | * @param bits format of fixed point number (32 - bits).bits |
172 | * |
173 | * note: input is normalized to (0, 1) fixed point value |
174 | */ |
175 | |
176 | static av_always_inline int fixed_sqrt(int x, int bits) |
177 | { |
178 | int retval, bit_mask, guess, square, i; |
179 | int64_t accu; |
180 | int shift1 = 30 - bits; |
181 | int shift2 = bits - 15; |
182 | |
183 | if (shift1 > 0) retval = ff_sqrt(x << shift1); |
184 | else retval = ff_sqrt(x >> -shift1); |
185 | |
186 | if (shift2 > 0) { |
187 | retval = retval << shift2; |
188 | bit_mask = (1 << (shift2 - 1)); |
189 | |
190 | for (i=0; i<shift2; i++){ |
191 | guess = retval + bit_mask; |
192 | accu = (int64_t)guess * guess; |
193 | square = (int)((accu + bit_mask) >> bits); |
194 | if (x >= square) |
195 | retval += bit_mask; |
196 | bit_mask >>= 1; |
197 | } |
198 | |
199 | } |
200 | else retval >>= (-shift2); |
201 | |
202 | return retval; |
203 | } |
204 | |
205 | #endif /* AVUTIL_FIXED_DSP_H */ |
206 |