FFmpeg: libavcodec/fmtconvert.c Source File

FFmpeg

libavcodec

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

43 static void int32_to_float_fmul_array8_c(FmtConvertContext *c, float *dst,

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

52 av_cold void ff_fmt_convert_init(FmtConvertContext *c, AVCodecContext *avctx)

53 {

54 c->int32_to_float = int32_to_float_c;

55 c->int32_to_float_fmul_scalar = int32_to_float_fmul_scalar_c;

56 c->int32_to_float_fmul_array8 = int32_to_float_fmul_array8_c;

57

58 if (ARCH_AARCH64)

59 ff_fmt_convert_init_aarch64(c, avctx);

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)

67 ff_fmt_convert_init_mips(c);

68 }

#define av_cold

Definition: attributes.h:90

ff_fmt_convert_init_ppc

void ff_fmt_convert_init_ppc(FmtConvertContext *c, AVCodecContext *avctx)

Definition: fmtconvert_altivec.c:57

ff_fmt_convert_init_aarch64

av_cold void ff_fmt_convert_init_aarch64(FmtConvertContext *c, AVCodecContext *avctx)

Definition: fmtconvert_init.c:34

static float mul(float src0, float src1)

Definition: dnn_backend_native_layer_mathbinary.c:39

ff_fmt_convert_init_mips

void ff_fmt_convert_init_mips(FmtConvertContext *c)

Definition: fmtconvert_mips.c:137

#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

ff_fmt_convert_init_arm

av_cold void ff_fmt_convert_init_arm(FmtConvertContext *c, AVCodecContext *avctx)

Definition: fmtconvert_init_arm.c:40

int32_to_float_fmul_scalar_c

static void int32_to_float_fmul_scalar_c(float *dst, const int32_t *src, float mul, int len)

Definition: fmtconvert.c:27

int32_to_float_fmul_array8_c

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

ff_fmt_convert_init

av_cold void ff_fmt_convert_init(FmtConvertContext *c, AVCodecContext *avctx)

Definition: fmtconvert.c:52

i

#define i(width, name, range_min, range_max)

Definition: cbs_h2645.c:271

ff_fmt_convert_init_x86

void ff_fmt_convert_init_x86(FmtConvertContext *c, AVCodecContext *avctx)

Definition: fmtconvert_init.c:41

int len

Definition: vorbis_enc_data.h:426

int32_to_float_c

static void int32_to_float_c(float *dst, const int32_t *src, intptr_t len)

Definition: fmtconvert.c:35

main external API structure.

Definition: avcodec.h:383

FmtConvertContext

Definition: fmtconvert.h:28

int32_t

Definition: audioconvert.c:56

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