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author | Dave Chapman <dave@dchapman.com> | 2009-05-09 01:04:20 +0000 |
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committer | Dave Chapman <dave@dchapman.com> | 2009-05-09 01:04:20 +0000 |
commit | 69db01e72f2de91d35703919bfc9d0700df83e85 (patch) | |
tree | 18a8d01dc3df13c5dc51b813d7ce70e6bec79704 /apps/codecs/libcook/libavutil/mem.c | |
parent | 681a774472eded71f7a82fbfa4c3591f3f98d209 (diff) | |
download | rockbox-69db01e72f2de91d35703919bfc9d0700df83e85.tar.gz rockbox-69db01e72f2de91d35703919bfc9d0700df83e85.zip |
Initial commit of the minimal set of ffmpeg (r18079) files required for Cook (realaudio) decoding. These are the unmodified versions from ffmpeg, committed as a base for future changes.
git-svn-id: svn://svn.rockbox.org/rockbox/trunk@20882 a1c6a512-1295-4272-9138-f99709370657
Diffstat (limited to 'apps/codecs/libcook/libavutil/mem.c')
-rw-r--r-- | apps/codecs/libcook/libavutil/mem.c | 159 |
1 files changed, 159 insertions, 0 deletions
diff --git a/apps/codecs/libcook/libavutil/mem.c b/apps/codecs/libcook/libavutil/mem.c new file mode 100644 index 0000000000..741450b53f --- /dev/null +++ b/apps/codecs/libcook/libavutil/mem.c | |||
@@ -0,0 +1,159 @@ | |||
1 | /* | ||
2 | * default memory allocator for libavutil | ||
3 | * Copyright (c) 2002 Fabrice Bellard | ||
4 | * | ||
5 | * This file is part of FFmpeg. | ||
6 | * | ||
7 | * FFmpeg is free software; you can redistribute it and/or | ||
8 | * modify it under the terms of the GNU Lesser General Public | ||
9 | * License as published by the Free Software Foundation; either | ||
10 | * version 2.1 of the License, or (at your option) any later version. | ||
11 | * | ||
12 | * FFmpeg is distributed in the hope that it will be useful, | ||
13 | * but WITHOUT ANY WARRANTY; without even the implied warranty of | ||
14 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU | ||
15 | * Lesser General Public License for more details. | ||
16 | * | ||
17 | * You should have received a copy of the GNU Lesser General Public | ||
18 | * License along with FFmpeg; if not, write to the Free Software | ||
19 | * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA | ||
20 | */ | ||
21 | |||
22 | /** | ||
23 | * @file libavutil/mem.c | ||
24 | * default memory allocator for libavutil | ||
25 | */ | ||
26 | |||
27 | #include "config.h" | ||
28 | |||
29 | #include <limits.h> | ||
30 | #include <stdlib.h> | ||
31 | #include <string.h> | ||
32 | #if HAVE_MALLOC_H | ||
33 | #include <malloc.h> | ||
34 | #endif | ||
35 | |||
36 | #include "mem.h" | ||
37 | |||
38 | /* here we can use OS-dependent allocation functions */ | ||
39 | #undef free | ||
40 | #undef malloc | ||
41 | #undef realloc | ||
42 | |||
43 | /* You can redefine av_malloc and av_free in your project to use your | ||
44 | memory allocator. You do not need to suppress this file because the | ||
45 | linker will do it automatically. */ | ||
46 | |||
47 | void *av_malloc(unsigned int size) | ||
48 | { | ||
49 | void *ptr = NULL; | ||
50 | #if CONFIG_MEMALIGN_HACK | ||
51 | long diff; | ||
52 | #endif | ||
53 | |||
54 | /* let's disallow possible ambiguous cases */ | ||
55 | if(size > (INT_MAX-16) ) | ||
56 | return NULL; | ||
57 | |||
58 | #if CONFIG_MEMALIGN_HACK | ||
59 | ptr = malloc(size+16); | ||
60 | if(!ptr) | ||
61 | return ptr; | ||
62 | diff= ((-(long)ptr - 1)&15) + 1; | ||
63 | ptr = (char*)ptr + diff; | ||
64 | ((char*)ptr)[-1]= diff; | ||
65 | #elif HAVE_POSIX_MEMALIGN | ||
66 | if (posix_memalign(&ptr,16,size)) | ||
67 | ptr = NULL; | ||
68 | #elif HAVE_MEMALIGN | ||
69 | ptr = memalign(16,size); | ||
70 | /* Why 64? | ||
71 | Indeed, we should align it: | ||
72 | on 4 for 386 | ||
73 | on 16 for 486 | ||
74 | on 32 for 586, PPro - K6-III | ||
75 | on 64 for K7 (maybe for P3 too). | ||
76 | Because L1 and L2 caches are aligned on those values. | ||
77 | But I don't want to code such logic here! | ||
78 | */ | ||
79 | /* Why 16? | ||
80 | Because some CPUs need alignment, for example SSE2 on P4, & most RISC CPUs | ||
81 | it will just trigger an exception and the unaligned load will be done in the | ||
82 | exception handler or it will just segfault (SSE2 on P4). | ||
83 | Why not larger? Because I did not see a difference in benchmarks ... | ||
84 | */ | ||
85 | /* benchmarks with P3 | ||
86 | memalign(64)+1 3071,3051,3032 | ||
87 | memalign(64)+2 3051,3032,3041 | ||
88 | memalign(64)+4 2911,2896,2915 | ||
89 | memalign(64)+8 2545,2554,2550 | ||
90 | memalign(64)+16 2543,2572,2563 | ||
91 | memalign(64)+32 2546,2545,2571 | ||
92 | memalign(64)+64 2570,2533,2558 | ||
93 | |||
94 | BTW, malloc seems to do 8-byte alignment by default here. | ||
95 | */ | ||
96 | #else | ||
97 | ptr = malloc(size); | ||
98 | #endif | ||
99 | return ptr; | ||
100 | } | ||
101 | |||
102 | void *av_realloc(void *ptr, unsigned int size) | ||
103 | { | ||
104 | #if CONFIG_MEMALIGN_HACK | ||
105 | int diff; | ||
106 | #endif | ||
107 | |||
108 | /* let's disallow possible ambiguous cases */ | ||
109 | if(size > (INT_MAX-16) ) | ||
110 | return NULL; | ||
111 | |||
112 | #if CONFIG_MEMALIGN_HACK | ||
113 | //FIXME this isn't aligned correctly, though it probably isn't needed | ||
114 | if(!ptr) return av_malloc(size); | ||
115 | diff= ((char*)ptr)[-1]; | ||
116 | return (char*)realloc((char*)ptr - diff, size + diff) + diff; | ||
117 | #else | ||
118 | return realloc(ptr, size); | ||
119 | #endif | ||
120 | } | ||
121 | |||
122 | void av_free(void *ptr) | ||
123 | { | ||
124 | /* XXX: this test should not be needed on most libcs */ | ||
125 | if (ptr) | ||
126 | #if CONFIG_MEMALIGN_HACK | ||
127 | free((char*)ptr - ((char*)ptr)[-1]); | ||
128 | #else | ||
129 | free(ptr); | ||
130 | #endif | ||
131 | } | ||
132 | |||
133 | void av_freep(void *arg) | ||
134 | { | ||
135 | void **ptr= (void**)arg; | ||
136 | av_free(*ptr); | ||
137 | *ptr = NULL; | ||
138 | } | ||
139 | |||
140 | void *av_mallocz(unsigned int size) | ||
141 | { | ||
142 | void *ptr = av_malloc(size); | ||
143 | if (ptr) | ||
144 | memset(ptr, 0, size); | ||
145 | return ptr; | ||
146 | } | ||
147 | |||
148 | char *av_strdup(const char *s) | ||
149 | { | ||
150 | char *ptr= NULL; | ||
151 | if(s){ | ||
152 | int len = strlen(s) + 1; | ||
153 | ptr = av_malloc(len); | ||
154 | if (ptr) | ||
155 | memcpy(ptr, s, len); | ||
156 | } | ||
157 | return ptr; | ||
158 | } | ||
159 | |||