FFmpeg
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  * Convert an array of int32_t to float.
42  * @param dst destination array of float.
43  * constraints: 32-byte aligned
44  * @param src source array of int32_t.
45  * constraints: 32-byte aligned
46  * @param len number of elements to convert.
47  * constraints: multiple of 8
48  */
49  void (*int32_to_float)(float *dst, const int32_t *src, intptr_t len);
50 
51  /**
52  * Convert an array of int32_t to float and multiply by a float value from another array,
53  * stepping along the float array once for each 8 integers.
54  * @param c pointer to FmtConvertContext.
55  * @param dst destination array of float.
56  * constraints: 16-byte aligned
57  * @param src source array of int32_t.
58  * constraints: 16-byte aligned
59  * @param mul source array of float multipliers.
60  * @param len number of elements to convert.
61  * constraints: multiple of 8
62  */
64  float *dst, const int32_t *src,
65  const float *mul, int len);
66 
68 
70 
76 
77 #endif /* AVCODEC_FMTCONVERT_H */
FmtConvertContext::int32_to_float_fmul_scalar
void(* int32_to_float_fmul_scalar)(float *dst, const int32_t *src, float mul, int len)
Convert an array of int32_t to float and multiply by a float value.
Definition: fmtconvert.h:38
ff_fmt_convert_init_ppc
void ff_fmt_convert_init_ppc(FmtConvertContext *c, AVCodecContext *avctx)
Definition: fmtconvert_altivec.c:57
mul
static float mul(float src0, float src1)
Definition: dnn_backend_native_layer_mathbinary.c:40
ff_fmt_convert_init_arm
void ff_fmt_convert_init_arm(FmtConvertContext *c, AVCodecContext *avctx)
Definition: fmtconvert_init_arm.c:40
ff_fmt_convert_init_mips
void ff_fmt_convert_init_mips(FmtConvertContext *c)
Definition: fmtconvert_mips.c:137
ff_fmt_convert_init_aarch64
void ff_fmt_convert_init_aarch64(FmtConvertContext *c, AVCodecContext *avctx)
Definition: fmtconvert_init.c:34
src
#define src
Definition: vp8dsp.c:255
c
Undefined Behavior In the C some operations are like signed integer dereferencing freed accessing outside allocated Undefined Behavior must not occur in a C it is not safe even if the output of undefined operations is unused The unsafety may seem nit picking but Optimizing compilers have in fact optimized code on the assumption that no undefined Behavior occurs Optimizing code based on wrong assumptions can and has in some cases lead to effects beyond the output of computations The signed integer overflow problem in speed critical code Code which is highly optimized and works with signed integers sometimes has the problem that often the output of the computation does not c
Definition: undefined.txt:32
FmtConvertContext::int32_to_float_fmul_array8
void(* int32_to_float_fmul_array8)(struct FmtConvertContext *c, float *dst, const int32_t *src, const float *mul, int len)
Convert an array of int32_t to float and multiply by a float value from another array,...
Definition: fmtconvert.h:63
ff_fmt_convert_init_x86
void ff_fmt_convert_init_x86(FmtConvertContext *c, AVCodecContext *avctx)
Definition: fmtconvert_init.c:41
len
int len
Definition: vorbis_enc_data.h:452
ff_fmt_convert_init
void ff_fmt_convert_init(FmtConvertContext *c, AVCodecContext *avctx)
Definition: fmtconvert.c:52
avcodec.h
AVCodecContext
main external API structure.
Definition: avcodec.h:501
FmtConvertContext::int32_to_float
void(* int32_to_float)(float *dst, const int32_t *src, intptr_t len)
Convert an array of int32_t to float.
Definition: fmtconvert.h:49
FmtConvertContext
Definition: fmtconvert.h:28
int32_t
int32_t
Definition: audioconvert.c:56