FFmpeg
fmtconvert.c
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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 #include "avcodec.h"
24 #include "fmtconvert.h"
25 #include "libavutil/common.h"
26 
27 static void int32_to_float_fmul_scalar_c(float *dst, const int32_t *src,
28  float mul, int len)
29 {
30  int i;
31  for(i=0; i<len; i++)
32  dst[i] = src[i] * mul;
33 }
34 
35 static void int32_to_float_c(float *dst, const int32_t *src, intptr_t len)
36 {
37  int i;
38 
39  for (i = 0; i < len; i++)
40  dst[i] = (float)src[i];
41 }
42 
44  const int32_t *src, const float *mul,
45  int len)
46 {
47  int i;
48  for (i = 0; i < len; i += 8)
49  c->int32_to_float_fmul_scalar(&dst[i], &src[i], *mul++, 8);
50 }
51 
53 {
57 
58  if (ARCH_AARCH64)
60  if (ARCH_ARM)
61  ff_fmt_convert_init_arm(c, avctx);
62  if (ARCH_PPC)
63  ff_fmt_convert_init_ppc(c, avctx);
64  if (ARCH_X86)
65  ff_fmt_convert_init_x86(c, avctx);
66  if (HAVE_MIPSFPU)
68 }
av_cold void ff_fmt_convert_init_aarch64(FmtConvertContext *c, AVCodecContext *avctx)
#define src
Definition: vp8dsp.c:254
static void int32_to_float_fmul_array8_c(FmtConvertContext *c, float *dst, const int32_t *src, const float *mul, int len)
Definition: fmtconvert.c:43
#define av_cold
Definition: attributes.h:82
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
void ff_fmt_convert_init_ppc(FmtConvertContext *c, AVCodecContext *avctx)
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, stepping along the float array once for each 8 integers.
Definition: fmtconvert.h:63
#define i(width, name, range_min, range_max)
Definition: cbs_h2645.c:259
av_cold void ff_fmt_convert_init_arm(FmtConvertContext *c, AVCodecContext *avctx)
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
int32_t
av_cold void ff_fmt_convert_init(FmtConvertContext *c, AVCodecContext *avctx)
Definition: fmtconvert.c:52
Libavcodec external API header.
main external API structure.
Definition: avcodec.h:1568
void ff_fmt_convert_init_x86(FmtConvertContext *c, AVCodecContext *avctx)
common internal and external API header
int len
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
static void int32_to_float_c(float *dst, const int32_t *src, intptr_t len)
Definition: fmtconvert.c:35
void ff_fmt_convert_init_mips(FmtConvertContext *c)
static void int32_to_float_fmul_scalar_c(float *dst, const int32_t *src, float mul, int len)
Definition: fmtconvert.c:27