FFmpeg
fdctdsp.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_FDCTDSP_H
20 #define AVCODEC_FDCTDSP_H
21 
22 #include <stdint.h>
23 
24 #include "avcodec.h"
25 
26 typedef struct FDCTDSPContext {
27  void (*fdct)(int16_t *block /* align 16 */);
28  void (*fdct248)(int16_t *block /* align 16 */);
30 
33  unsigned high_bit_depth);
35  unsigned high_bit_depth);
36 
37 #endif /* AVCODEC_FDCTDSP_H */
The exact code depends on how similar the blocks are and how related they are to the block
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_fdctdsp_init(FDCTDSPContext *c, AVCodecContext *avctx)
Definition: fdctdsp.c:26
void ff_fdctdsp_init_x86(FDCTDSPContext *c, AVCodecContext *avctx, unsigned high_bit_depth)
Definition: fdctdsp_init.c:26
typedef void(APIENTRY *FF_PFNGLACTIVETEXTUREPROC)(GLenum texture)
void(* fdct)(int16_t *block)
Definition: fdctdsp.h:27
void ff_fdctdsp_init_ppc(FDCTDSPContext *c, AVCodecContext *avctx, unsigned high_bit_depth)
Definition: fdctdsp.c:464
Libavcodec external API header.
main external API structure.
Definition: avcodec.h:1568
void(* fdct248)(int16_t *block)
Definition: fdctdsp.h:28