FFmpeg
 All Data Structures Namespaces Files Functions Variables Typedefs Enumerations Enumerator Macros Groups Pages
float_dsp.h
Go to the documentation of this file.
1 /*
2  * This file is part of FFmpeg.
3  *
4  * FFmpeg is free software; you can redistribute it and/or
5  * modify it under the terms of the GNU Lesser General Public
6  * License as published by the Free Software Foundation; either
7  * version 2.1 of the License, or (at your option) any later version.
8  *
9  * FFmpeg is distributed in the hope that it will be useful,
10  * but WITHOUT ANY WARRANTY; without even the implied warranty of
11  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
12  * Lesser General Public License for more details.
13  *
14  * You should have received a copy of the GNU Lesser General Public
15  * License along with FFmpeg; if not, write to the Free Software
16  * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
17  */
18 
19 #ifndef AVUTIL_FLOAT_DSP_H
20 #define AVUTIL_FLOAT_DSP_H
21 
22 #include "config.h"
23 
24 typedef struct AVFloatDSPContext {
25  /**
26  * Calculate the product of two vectors of floats and store the result in
27  * a vector of floats.
28  *
29  * @param dst output vector
30  * constraints: 32-byte aligned
31  * @param src0 first input vector
32  * constraints: 32-byte aligned
33  * @param src1 second input vector
34  * constraints: 32-byte aligned
35  * @param len number of elements in the input
36  * constraints: multiple of 16
37  */
38  void (*vector_fmul)(float *dst, const float *src0, const float *src1,
39  int len);
40 
41  /**
42  * Multiply a vector of floats by a scalar float and add to
43  * destination vector. Source and destination vectors must
44  * overlap exactly or not at all.
45  *
46  * @param dst result vector
47  * constraints: 32-byte aligned
48  * @param src input vector
49  * constraints: 32-byte aligned
50  * @param mul scalar value
51  * @param len length of vector
52  * constraints: multiple of 16
53  */
54  void (*vector_fmac_scalar)(float *dst, const float *src, float mul,
55  int len);
56 
57  /**
58  * Multiply a vector of floats by a scalar float. Source and
59  * destination vectors must overlap exactly or not at all.
60  *
61  * @param dst result vector
62  * constraints: 16-byte aligned
63  * @param src input vector
64  * constraints: 16-byte aligned
65  * @param mul scalar value
66  * @param len length of vector
67  * constraints: multiple of 4
68  */
69  void (*vector_fmul_scalar)(float *dst, const float *src, float mul,
70  int len);
71 
72  /**
73  * Multiply a vector of double by a scalar double. Source and
74  * destination vectors must overlap exactly or not at all.
75  *
76  * @param dst result vector
77  * constraints: 32-byte aligned
78  * @param src input vector
79  * constraints: 32-byte aligned
80  * @param mul scalar value
81  * @param len length of vector
82  * constraints: multiple of 8
83  */
84  void (*vector_dmul_scalar)(double *dst, const double *src, double mul,
85  int len);
86 
87  /**
88  * Overlap/add with window function.
89  * Used primarily by MDCT-based audio codecs.
90  * Source and destination vectors must overlap exactly or not at all.
91  *
92  * @param dst result vector
93  * constraints: 16-byte aligned
94  * @param src0 first source vector
95  * constraints: 16-byte aligned
96  * @param src1 second source vector
97  * constraints: 16-byte aligned
98  * @param win half-window vector
99  * constraints: 16-byte aligned
100  * @param len length of vector
101  * constraints: multiple of 4
102  */
103  void (*vector_fmul_window)(float *dst, const float *src0,
104  const float *src1, const float *win, int len);
105 
106  /**
107  * Calculate the product of two vectors of floats, add a third vector of
108  * floats and store the result in a vector of floats.
109  *
110  * @param dst output vector
111  * constraints: 32-byte aligned
112  * @param src0 first input vector
113  * constraints: 32-byte aligned
114  * @param src1 second input vector
115  * constraints: 32-byte aligned
116  * @param src1 third input vector
117  * constraints: 32-byte aligned
118  * @param len number of elements in the input
119  * constraints: multiple of 16
120  */
121  void (*vector_fmul_add)(float *dst, const float *src0, const float *src1,
122  const float *src2, int len);
123 
124  /**
125  * Calculate the product of two vectors of floats, and store the result
126  * in a vector of floats. The second vector of floats is iterated over
127  * in reverse order.
128  *
129  * @param dst output vector
130  * constraints: 32-byte aligned
131  * @param src0 first input vector
132  * constraints: 32-byte aligned
133  * @param src1 second input vector
134  * constraints: 32-byte aligned
135  * @param src1 third input vector
136  * constraints: 32-byte aligned
137  * @param len number of elements in the input
138  * constraints: multiple of 16
139  */
140  void (*vector_fmul_reverse)(float *dst, const float *src0,
141  const float *src1, int len);
142 
143  /**
144  * Calculate the sum and difference of two vectors of floats.
145  *
146  * @param v1 first input vector, sum output, 16-byte aligned
147  * @param v2 second input vector, difference output, 16-byte aligned
148  * @param len length of vectors, multiple of 4
149  */
150  void (*butterflies_float)(float *av_restrict v1, float *av_restrict v2, int len);
151 
152  /**
153  * Calculate the scalar product of two vectors of floats.
154  *
155  * @param v1 first vector, 16-byte aligned
156  * @param v2 second vector, 16-byte aligned
157  * @param len length of vectors, multiple of 4
158  *
159  * @return sum of elementwise products
160  */
161  float (*scalarproduct_float)(const float *v1, const float *v2, int len);
163 
164 /**
165  * Return the scalar product of two vectors.
166  *
167  * @param v1 first input vector
168  * @param v2 first input vector
169  * @param len number of elements
170  *
171  * @return sum of elementwise products
172  */
173 float avpriv_scalarproduct_float_c(const float *v1, const float *v2, int len);
174 
175 /**
176  * Initialize a float DSP context.
177  *
178  * @param fdsp float DSP context
179  * @param strict setting to non-zero avoids using functions which may not be IEEE-754 compliant
180  */
181 void avpriv_float_dsp_init(AVFloatDSPContext *fdsp, int strict);
182 
183 
185 void ff_float_dsp_init_ppc(AVFloatDSPContext *fdsp, int strict);
188 
189 #endif /* AVUTIL_FLOAT_DSP_H */