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fmtconvert.h
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1 /*
2  * Format Conversion Utils
3  * Copyright (c) 2000, 2001 Fabrice Bellard
4  * Copyright (c) 2002-2004 Michael Niedermayer <michaelni@gmx.at>
5  *
6  * This file is part of FFmpeg.
7  *
8  * FFmpeg is free software; you can redistribute it and/or
9  * modify it under the terms of the GNU Lesser General Public
10  * License as published by the Free Software Foundation; either
11  * version 2.1 of the License, or (at your option) any later version.
12  *
13  * FFmpeg is distributed in the hope that it will be useful,
14  * but WITHOUT ANY WARRANTY; without even the implied warranty of
15  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
16  * Lesser General Public License for more details.
17  *
18  * You should have received a copy of the GNU Lesser General Public
19  * License along with FFmpeg; if not, write to the Free Software
20  * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
21  */
22 
23 #ifndef AVCODEC_FMTCONVERT_H
24 #define AVCODEC_FMTCONVERT_H
25 
26 #include "avcodec.h"
27 
28 typedef struct FmtConvertContext {
29  /**
30  * Convert an array of int32_t to float and multiply by a float value.
31  * @param dst destination array of float.
32  * constraints: 16-byte aligned
33  * @param src source array of int32_t.
34  * constraints: 16-byte aligned
35  * @param len number of elements to convert.
36  * constraints: multiple of 8
37  */
38  void (*int32_to_float_fmul_scalar)(float *dst, const int32_t *src,
39  float mul, int len);
40 
41  /**
42  * Convert an array of int32_t to float and multiply by a float value from another array,
43  * stepping along the float array once for each 8 integers.
44  * @param c pointer to FmtConvertContext.
45  * @param dst destination array of float.
46  * constraints: 16-byte aligned
47  * @param src source array of int32_t.
48  * constraints: 16-byte aligned
49  * @param mul source array of float multipliers.
50  * @param len number of elements to convert.
51  * constraints: multiple of 8
52  */
54  float *dst, const int32_t *src,
55  const float *mul, int len);
56 
57  /**
58  * Convert an array of float to an array of int16_t.
59  *
60  * Convert floats from in the range [-32768.0,32767.0] to ints
61  * without rescaling
62  *
63  * @param dst destination array of int16_t.
64  * constraints: 16-byte aligned
65  * @param src source array of float.
66  * constraints: 16-byte aligned
67  * @param len number of elements to convert.
68  * constraints: multiple of 8
69  */
70  void (*float_to_int16)(int16_t *dst, const float *src, long len);
71 
72  /**
73  * Convert multiple arrays of float to an interleaved array of int16_t.
74  *
75  * Convert floats from in the range [-32768.0,32767.0] to ints
76  * without rescaling
77  *
78  * @param dst destination array of interleaved int16_t.
79  * constraints: 16-byte aligned
80  * @param src source array of float arrays, one for each channel.
81  * constraints: 16-byte aligned
82  * @param len number of elements to convert.
83  * constraints: multiple of 8
84  * @param channels number of channels
85  */
86  void (*float_to_int16_interleave)(int16_t *dst, const float **src,
87  long len, int channels);
88 
89  /**
90  * Convert multiple arrays of float to an array of interleaved float.
91  *
92  * @param dst destination array of interleaved float.
93  * constraints: 16-byte aligned
94  * @param src source array of float arrays, one for each channel.
95  * constraints: 16-byte aligned
96  * @param len number of elements to convert.
97  * constraints: multiple of 8
98  * @param channels number of channels
99  */
100  void (*float_interleave)(float *dst, const float **src, unsigned int len,
101  int channels);
103 
104 void ff_float_interleave_c(float *dst, const float **src, unsigned int len,
105  int channels);
106 
108 
113 
114 /* ffdshow custom code */
115 void float_interleave(float *dst, const float **src, long len, int channels);
116 void float_interleave_noscale(float *dst, const float **src, long len, int channels);
117 
118 #endif /* AVCODEC_FMTCONVERT_H */