FFmpeg: libavcodec/pixblockdsp.c Source File

FFmpeg

libavcodec

pixblockdsp.c

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1 /*

2 * This file is part of FFmpeg.

3 *

4 * FFmpeg is free software; you can redistribute it and/or

5 * modify it under the terms of the GNU Lesser General Public

6 * License as published by the Free Software Foundation; either

7 * version 2.1 of the License, or (at your option) any later version.

8 *

9 * FFmpeg is distributed in the hope that it will be useful,

10 * but WITHOUT ANY WARRANTY; without even the implied warranty of

11 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU

12 * Lesser General Public License for more details.

13 *

14 * You should have received a copy of the GNU Lesser General Public

15 * License along with FFmpeg; if not, write to the Free Software

16 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA

17 */

18

19 #include <stdint.h>

20

21 #include "config.h"

22 #include "libavutil/attributes.h"

23 #include "libavutil/intreadwrite.h"

24 #include "avcodec.h"

25 #include "pixblockdsp.h"

26

27 static void get_pixels_16_c(int16_t *restrict block, const uint8_t *pixels,

28 ptrdiff_t stride)

29 {

30 AV_COPY128U(block + 0 * 8, pixels + 0 * stride);

31 AV_COPY128U(block + 1 * 8, pixels + 1 * stride);

32 AV_COPY128U(block + 2 * 8, pixels + 2 * stride);

33 AV_COPY128U(block + 3 * 8, pixels + 3 * stride);

34 AV_COPY128U(block + 4 * 8, pixels + 4 * stride);

35 AV_COPY128U(block + 5 * 8, pixels + 5 * stride);

36 AV_COPY128U(block + 6 * 8, pixels + 6 * stride);

37 AV_COPY128U(block + 7 * 8, pixels + 7 * stride);

38 }

39

40 static void get_pixels_8_c(int16_t *restrict block, const uint8_t *pixels,

41 ptrdiff_t stride)

42 {

43 int i;

44

45 /* read the pixels */

46 for (i = 0; i < 8; i++) {

47 block[0] = pixels[0];

48 block[1] = pixels[1];

49 block[2] = pixels[2];

50 block[3] = pixels[3];

51 block[4] = pixels[4];

52 block[5] = pixels[5];

53 block[6] = pixels[6];

54 block[7] = pixels[7];

55 pixels += stride;

56 block += 8;

57 }

58 }

59

60 static void diff_pixels_c(int16_t *restrict block, const uint8_t *s1,

61 const uint8_t *s2, ptrdiff_t stride)

62 {

63 int i;

64

65 /* read the pixels */

66 for (i = 0; i < 8; i++) {

67 block[0] = s1[0] - s2[0];

68 block[1] = s1[1] - s2[1];

69 block[2] = s1[2] - s2[2];

70 block[3] = s1[3] - s2[3];

71 block[4] = s1[4] - s2[4];

72 block[5] = s1[5] - s2[5];

73 block[6] = s1[6] - s2[6];

74 block[7] = s1[7] - s2[7];

75 s1 += stride;

76 s2 += stride;

77 block += 8;

78 }

79 }

80

81 av_cold void ff_pixblockdsp_init(PixblockDSPContext *c, AVCodecContext *avctx)

82 {

83 av_unused const unsigned high_bit_depth = avctx->bits_per_raw_sample > 8;

84

85 c->diff_pixels_unaligned =

86 c->diff_pixels = diff_pixels_c;

87

88 switch (avctx->bits_per_raw_sample) {

89 case 9:

90 case 10:

91 case 12:

92 case 14:

93 c->get_pixels_unaligned =

94 c->get_pixels = get_pixels_16_c;

95 break;

96 default:

97 if (avctx->bits_per_raw_sample<=8 || avctx->codec_type != AVMEDIA_TYPE_VIDEO) {

98 c->get_pixels_unaligned =

99 c->get_pixels = get_pixels_8_c;

100 }

101 break;

102 }

103

104 #if ARCH_AARCH64

105 ff_pixblockdsp_init_aarch64(c, avctx, high_bit_depth);

106 #elif ARCH_ALPHA

107 ff_pixblockdsp_init_alpha(c, avctx, high_bit_depth);

108 #elif ARCH_ARM

109 ff_pixblockdsp_init_arm(c, avctx, high_bit_depth);

110 #elif ARCH_PPC

111 ff_pixblockdsp_init_ppc(c, avctx, high_bit_depth);

112 #elif ARCH_RISCV

113 ff_pixblockdsp_init_riscv(c, avctx, high_bit_depth);

114 #elif ARCH_X86

115 ff_pixblockdsp_init_x86(c, avctx, high_bit_depth);

116 #elif ARCH_MIPS

117 ff_pixblockdsp_init_mips(c, avctx, high_bit_depth);

118 #endif

119 }

ff_pixblockdsp_init_x86

void ff_pixblockdsp_init_x86(PixblockDSPContext *c, AVCodecContext *avctx, unsigned high_bit_depth)

Definition: pixblockdsp_init.c:30

ff_pixblockdsp_init_arm

av_cold void ff_pixblockdsp_init_arm(PixblockDSPContext *c, AVCodecContext *avctx, unsigned high_bit_depth)

Definition: pixblockdsp_init_arm.c:41

ff_pixblockdsp_init_mips

void ff_pixblockdsp_init_mips(PixblockDSPContext *c, AVCodecContext *avctx, unsigned high_bit_depth)

Definition: pixblockdsp_init_mips.c:25

#define av_unused

Definition: attributes.h:131

ff_pixblockdsp_init

av_cold void ff_pixblockdsp_init(PixblockDSPContext *c, AVCodecContext *avctx)

Definition: pixblockdsp.c:81

ff_pixblockdsp_init_ppc

av_cold void ff_pixblockdsp_init_ppc(PixblockDSPContext *c, AVCodecContext *avctx, unsigned high_bit_depth)

Definition: pixblockdsp.c:265

#define av_cold

Definition: attributes.h:90

#define s1

Definition: regdef.h:38

AVCodecContext::bits_per_raw_sample

int bits_per_raw_sample

Bits per sample/pixel of internal libavcodec pixel/sample format.

Definition: avcodec.h:1574

static void get_pixels_8_c(int16_t *restrict block, const uint8_t *pixels, ptrdiff_t stride)

Definition: pixblockdsp.c:40

get_pixels_16_c

static void get_pixels_16_c(int16_t *restrict block, const uint8_t *pixels, ptrdiff_t stride)

Definition: pixblockdsp.c:27

PixblockDSPContext

Definition: pixblockdsp.h:26

#define AV_COPY128U(d, s)

Definition: intreadwrite.h:578

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

#define s2

Definition: regdef.h:39

ff_pixblockdsp_init_alpha

av_cold void ff_pixblockdsp_init_alpha(PixblockDSPContext *c, AVCodecContext *avctx, unsigned high_bit_depth)

Definition: pixblockdsp_alpha.c:71

ff_pixblockdsp_init_riscv

void ff_pixblockdsp_init_riscv(PixblockDSPContext *c, AVCodecContext *avctx, unsigned high_bit_depth)

Definition: pixblockdsp_init.c:44

i

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

Definition: cbs_h2645.c:255

#define stride

Definition: h264pred_template.c:537

main external API structure.

Definition: avcodec.h:445

AVCodecContext::codec_type

enum AVMediaType codec_type

Definition: avcodec.h:453

AVMEDIA_TYPE_VIDEO

@ AVMEDIA_TYPE_VIDEO

Definition: avutil.h:201

static void diff_pixels_c(int16_t *restrict block, const uint8_t *s1, const uint8_t *s2, ptrdiff_t stride)

Definition: pixblockdsp.c:60

ff_pixblockdsp_init_aarch64

av_cold void ff_pixblockdsp_init_aarch64(PixblockDSPContext *c, AVCodecContext *avctx, unsigned high_bit_depth)

Definition: pixblockdsp_init_aarch64.c:32

The exact code depends on how similar the blocks are and how related they are to the block

Definition: filter_design.txt:207

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