FFmpeg: libavcodec/blockdsp.h Source File

FFmpeg

libavcodec

blockdsp.h

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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 #ifndef AVCODEC_BLOCKDSP_H

20 #define AVCODEC_BLOCKDSP_H

21

22 #include <stddef.h>

23 #include <stdint.h>

24

25 #include "avcodec.h"

26

27 /* add and put pixel (decoding)

28 * Block sizes for op_pixels_func are 8x4,8x8 16x8 16x16.

29 * h for op_pixels_func is limited to { width / 2, width },

30 * but never larger than 16 and never smaller than 4. */

31 typedef void (*op_fill_func)(uint8_t *block /* align width (8 or 16) */,

32 uint8_t value, ptrdiff_t line_size, int h);

33

34 typedef struct BlockDSPContext {

35 void (*clear_block)(int16_t *block /* align 32 */);

36 void (*clear_blocks)(int16_t *blocks /* align 32 */);

37

38 op_fill_func fill_block_tab[2];

39 } BlockDSPContext;

40

41 void ff_blockdsp_init(BlockDSPContext *c, AVCodecContext *avctx);

42

43 void ff_blockdsp_init_alpha(BlockDSPContext *c);

44 void ff_blockdsp_init_arm(BlockDSPContext *c);

45 void ff_blockdsp_init_ppc(BlockDSPContext *c);

46 void ff_blockdsp_init_x86(BlockDSPContext *c, AVCodecContext *avctx);

47 void ff_blockdsp_init_mips(BlockDSPContext *c);

48

49 #endif /* AVCODEC_BLOCKDSP_H */

BlockDSPContext::fill_block_tab

op_fill_func fill_block_tab[2]

Definition: blockdsp.h:38

BlockDSPContext::clear_blocks

void(* clear_blocks)(int16_t *blocks)

Definition: blockdsp.h:36

BlockDSPContext::clear_block

void(* clear_block)(int16_t *block)

Definition: blockdsp.h:35

ff_blockdsp_init_mips

void ff_blockdsp_init_mips(BlockDSPContext *c)

Definition: blockdsp_init_mips.c:25

BlockDSPContext

Definition: blockdsp.h:34

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_blockdsp_init_ppc

void ff_blockdsp_init_ppc(BlockDSPContext *c)

Definition: blockdsp.c:145

ff_blockdsp_init_arm

void ff_blockdsp_init_arm(BlockDSPContext *c)

Definition: blockdsp_init_arm.c:27

ff_blockdsp_init

void ff_blockdsp_init(BlockDSPContext *c, AVCodecContext *avctx)

Definition: blockdsp.c:59

it s the only field you need to keep assuming you have a context There is some magic you don t need to care about around this just let it vf default value

Definition: writing_filters.txt:86

main external API structure.

Definition: avcodec.h:389

ff_blockdsp_init_x86

void ff_blockdsp_init_x86(BlockDSPContext *c, AVCodecContext *avctx)

Definition: blockdsp_init.c:32

void(* op_fill_func)(uint8_t *block, uint8_t value, ptrdiff_t line_size, int h)

Definition: blockdsp.h:31

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

Definition: filter_design.txt:207

h

h

Definition: vp9dsp_template.c:2038

ff_blockdsp_init_alpha

void ff_blockdsp_init_alpha(BlockDSPContext *c)

Definition: blockdsp_alpha.c:46

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