diff options
author | Dave Chapman <dave@dchapman.com> | 2009-05-09 01:04:20 +0000 |
---|---|---|
committer | Dave Chapman <dave@dchapman.com> | 2009-05-09 01:04:20 +0000 |
commit | 69db01e72f2de91d35703919bfc9d0700df83e85 (patch) | |
tree | 18a8d01dc3df13c5dc51b813d7ce70e6bec79704 /apps/codecs/libcook/libavutil/lfg.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/lfg.c')
-rw-r--r-- | apps/codecs/libcook/libavutil/lfg.c | 64 |
1 files changed, 64 insertions, 0 deletions
diff --git a/apps/codecs/libcook/libavutil/lfg.c b/apps/codecs/libcook/libavutil/lfg.c new file mode 100644 index 0000000000..337ee9e41c --- /dev/null +++ b/apps/codecs/libcook/libavutil/lfg.c | |||
@@ -0,0 +1,64 @@ | |||
1 | /* | ||
2 | * Lagged Fibonacci PRNG | ||
3 | * Copyright (c) 2008 Michael Niedermayer | ||
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 | #include <inttypes.h> | ||
23 | #include "lfg.h" | ||
24 | #include "md5.h" | ||
25 | #include "intreadwrite.h" | ||
26 | |||
27 | void av_cold av_lfg_init(AVLFG *c, unsigned int seed){ | ||
28 | uint8_t tmp[16]={0}; | ||
29 | int i; | ||
30 | |||
31 | for(i=8; i<64; i+=4){ | ||
32 | AV_WL32(tmp, seed); tmp[4]=i; | ||
33 | av_md5_sum(tmp, tmp, 16); | ||
34 | c->state[i ]= AV_RL32(tmp); | ||
35 | c->state[i+1]= AV_RL32(tmp+4); | ||
36 | c->state[i+2]= AV_RL32(tmp+8); | ||
37 | c->state[i+3]= AV_RL32(tmp+12); | ||
38 | } | ||
39 | c->index=0; | ||
40 | } | ||
41 | |||
42 | #ifdef TEST | ||
43 | #include "log.h" | ||
44 | #include "common.h" | ||
45 | |||
46 | int main(void) | ||
47 | { | ||
48 | int x=0; | ||
49 | int i, j; | ||
50 | AVLFG state; | ||
51 | |||
52 | av_lfg_init(&state, 0xdeadbeef); | ||
53 | for (j = 0; j < 10000; j++) { | ||
54 | START_TIMER | ||
55 | for (i = 0; i < 624; i++) { | ||
56 | // av_log(NULL,AV_LOG_ERROR, "%X\n", av_lfg_get(&state)); | ||
57 | x+=av_lfg_get(&state); | ||
58 | } | ||
59 | STOP_TIMER("624 calls of av_random"); | ||
60 | } | ||
61 | av_log(NULL, AV_LOG_ERROR, "final value:%X\n", x); | ||
62 | return 0; | ||
63 | } | ||
64 | #endif | ||