FFmpeg
xvididct_init_mips.c
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1 /*
2  * Copyright (c) 2015 Zhou Xiaoyong <zhouxiaoyong@loongson.cn>
3  *
4  * This file is part of FFmpeg.
5  *
6  * FFmpeg is free software; you can redistribute it and/or
7  * modify it under the terms of the GNU Lesser General Public
8  * License as published by the Free Software Foundation; either
9  * version 2.1 of the License, or (at your option) any later version.
10  *
11  * FFmpeg is distributed in the hope that it will be useful,
12  * but WITHOUT ANY WARRANTY; without even the implied warranty of
13  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
14  * Lesser General Public License for more details.
15  *
16  * You should have received a copy of the GNU Lesser General Public
17  * License along with FFmpeg; if not, write to the Free Software
18  * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
19  */
20 
21 #include "libavutil/attributes.h"
22 #include "libavutil/mips/cpu.h"
23 #include "xvididct_mips.h"
24 
26  unsigned high_bit_depth)
27 {
29 
30  if (have_mmi(cpu_flags)) {
31  if (!high_bit_depth) {
32  if (avctx->idct_algo == FF_IDCT_AUTO ||
33  avctx->idct_algo == FF_IDCT_XVID) {
34  c->idct_put = ff_xvid_idct_put_mmi;
35  c->idct_add = ff_xvid_idct_add_mmi;
36  c->idct = ff_xvid_idct_mmi;
37  c->perm_type = FF_IDCT_PERM_NONE;
38  }
39  }
40  }
41 }
have_mmi
#define have_mmi(flags)
Definition: cpu.h:25
av_get_cpu_flags
int av_get_cpu_flags(void)
Return the flags which specify extensions supported by the CPU.
Definition: cpu.c:96
cpu_flags
static atomic_int cpu_flags
Definition: cpu.c:50
FF_IDCT_AUTO
#define FF_IDCT_AUTO
Definition: avcodec.h:1398
FF_IDCT_XVID
#define FF_IDCT_XVID
Definition: avcodec.h:1405
ff_xvid_idct_add_mmi
void ff_xvid_idct_add_mmi(uint8_t *dest, ptrdiff_t line_size, int16_t *block)
Definition: xvid_idct_mmi.c:251
av_cold
#define av_cold
Definition: attributes.h:90
xvididct_mips.h
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_IDCT_PERM_NONE
@ FF_IDCT_PERM_NONE
Definition: idctdsp.h:38
attributes.h
ff_xvid_idct_init_mips
av_cold void ff_xvid_idct_init_mips(IDCTDSPContext *c, AVCodecContext *avctx, unsigned high_bit_depth)
Definition: xvididct_init_mips.c:25
AVCodecContext::idct_algo
int idct_algo
IDCT algorithm, see FF_IDCT_* below.
Definition: avcodec.h:1397
ff_xvid_idct_put_mmi
void ff_xvid_idct_put_mmi(uint8_t *dest, ptrdiff_t line_size, int16_t *block)
Definition: xvid_idct_mmi.c:245
IDCTDSPContext
Definition: idctdsp.h:53
AVCodecContext
main external API structure.
Definition: avcodec.h:383
ff_xvid_idct_mmi
void ff_xvid_idct_mmi(int16_t *block)
Definition: xvid_idct_mmi.c:225
cpu.h