FFmpeg: libavcodec/fmtconvert.h Source File

FFmpeg

[フレーム]

libavcodec

fmtconvert.h

Go to the documentation of this file.

1 /*

2 * Format Conversion Utils

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 */

23 #ifndef AVCODEC_FMTCONVERT_H

24 #define AVCODEC_FMTCONVERT_H

26 #include "avcodec.h"

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);

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 */

63 void (*int32_to_float_fmul_array8)(struct FmtConvertContext *c,

64 float *dst, const int32_t *src,

65 const float *mul, int len);

67 } FmtConvertContext;

69 void ff_fmt_convert_init(FmtConvertContext *c, AVCodecContext *avctx);

71 void ff_fmt_convert_init_aarch64(FmtConvertContext *c, AVCodecContext *avctx);

72 void ff_fmt_convert_init_arm(FmtConvertContext *c, AVCodecContext *avctx);

73 void ff_fmt_convert_init_ppc(FmtConvertContext *c, AVCodecContext *avctx);

74 void ff_fmt_convert_init_x86(FmtConvertContext *c, AVCodecContext *avctx);

75 void ff_fmt_convert_init_mips(FmtConvertContext *c);

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:39

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

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:426

ff_fmt_convert_init