FFmpeg
h264chroma_init.c
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1 /*
2  * Copyright (c) 2004 Romain Dolbeau <romain@dolbeau.org>
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 "config.h"
22 
23 #include "libavutil/attributes.h"
24 #include "libavutil/cpu.h"
25 #include "libavutil/intreadwrite.h"
26 #include "libavutil/ppc/cpu.h"
28 
29 #include "libavcodec/h264chroma.h"
30 
31 #if HAVE_ALTIVEC
32 #define PUT_OP_U8_ALTIVEC(d, s, dst) d = s
33 #define AVG_OP_U8_ALTIVEC(d, s, dst) d = vec_avg(dst, s)
34 
35 #define OP_U8_ALTIVEC PUT_OP_U8_ALTIVEC
36 #define PREFIX_h264_chroma_mc8_altivec put_h264_chroma_mc8_altivec
37 #define PREFIX_h264_chroma_mc8_num altivec_put_h264_chroma_mc8_num
38 #include "h264chroma_template.c"
39 #undef OP_U8_ALTIVEC
40 #undef PREFIX_h264_chroma_mc8_altivec
41 #undef PREFIX_h264_chroma_mc8_num
42 
43 #define OP_U8_ALTIVEC AVG_OP_U8_ALTIVEC
44 #define PREFIX_h264_chroma_mc8_altivec avg_h264_chroma_mc8_altivec
45 #define PREFIX_h264_chroma_mc8_num altivec_avg_h264_chroma_mc8_num
46 #include "h264chroma_template.c"
47 #undef OP_U8_ALTIVEC
48 #undef PREFIX_h264_chroma_mc8_altivec
49 #undef PREFIX_h264_chroma_mc8_num
50 #endif /* HAVE_ALTIVEC */
51 
53 {
54 #if HAVE_ALTIVEC
55  const int high_bit_depth = bit_depth > 8;
56 
58  return;
59 
60  if (!high_bit_depth) {
61  c->put_h264_chroma_pixels_tab[0] = put_h264_chroma_mc8_altivec;
62  c->avg_h264_chroma_pixels_tab[0] = avg_h264_chroma_mc8_altivec;
63  }
64 #endif /* HAVE_ALTIVEC */
65 }
av_cold void ff_h264chroma_init_ppc(H264ChromaContext *c, int bit_depth)
h264_chroma_mc_func put_h264_chroma_pixels_tab[4]
Definition: h264chroma.h:28
Macro definitions for various function/variable attributes.
#define av_cold
Definition: attributes.h:82
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 PPC_ALTIVEC(flags)
Definition: cpu.h:25
static void bit_depth(AudioStatsContext *s, uint64_t mask, uint64_t imask, AVRational *depth)
Definition: af_astats.c:226
int av_get_cpu_flags(void)
Return the flags which specify extensions supported by the CPU.
Definition: cpu.c:93
Contains misc utility macros and inline functions.
h264_chroma_mc_func avg_h264_chroma_pixels_tab[4]
Definition: h264chroma.h:29