diff options
Diffstat (limited to 'apps/codecs/Tremor/window.c')
-rw-r--r-- | apps/codecs/Tremor/window.c | 84 |
1 files changed, 84 insertions, 0 deletions
diff --git a/apps/codecs/Tremor/window.c b/apps/codecs/Tremor/window.c new file mode 100644 index 0000000000..4d6e79e81d --- /dev/null +++ b/apps/codecs/Tremor/window.c | |||
@@ -0,0 +1,84 @@ | |||
1 | /******************************************************************** | ||
2 | * * | ||
3 | * THIS FILE IS PART OF THE OggVorbis 'TREMOR' CODEC SOURCE CODE. * | ||
4 | * * | ||
5 | * USE, DISTRIBUTION AND REPRODUCTION OF THIS LIBRARY SOURCE IS * | ||
6 | * GOVERNED BY A BSD-STYLE SOURCE LICENSE INCLUDED WITH THIS SOURCE * | ||
7 | * IN 'COPYING'. PLEASE READ THESE TERMS BEFORE DISTRIBUTING. * | ||
8 | * * | ||
9 | * THE OggVorbis 'TREMOR' SOURCE CODE IS (C) COPYRIGHT 1994-2002 * | ||
10 | * BY THE Xiph.Org FOUNDATION http://www.xiph.org/ * | ||
11 | * * | ||
12 | ******************************************************************** | ||
13 | |||
14 | function: window functions | ||
15 | |||
16 | ********************************************************************/ | ||
17 | |||
18 | #include <stdlib.h> | ||
19 | #include <math.h> | ||
20 | #include "os.h" | ||
21 | #include "misc.h" | ||
22 | #include "window.h" | ||
23 | #include "window_lookup.h" | ||
24 | |||
25 | const void *_vorbis_window(int type, int left){ | ||
26 | |||
27 | switch(type){ | ||
28 | case 0: | ||
29 | |||
30 | switch(left){ | ||
31 | case 32: | ||
32 | return vwin64; | ||
33 | case 64: | ||
34 | return vwin128; | ||
35 | case 128: | ||
36 | return vwin256; | ||
37 | case 256: | ||
38 | return vwin512; | ||
39 | case 512: | ||
40 | return vwin1024; | ||
41 | case 1024: | ||
42 | return vwin2048; | ||
43 | case 2048: | ||
44 | return vwin4096; | ||
45 | case 4096: | ||
46 | return vwin8192; | ||
47 | default: | ||
48 | return(0); | ||
49 | } | ||
50 | break; | ||
51 | default: | ||
52 | return(0); | ||
53 | } | ||
54 | } | ||
55 | |||
56 | void _vorbis_apply_window(ogg_int32_t *d,const void *window_p[2], | ||
57 | long *blocksizes, | ||
58 | int lW,int W,int nW){ | ||
59 | |||
60 | LOOKUP_T *window[2]={window_p[0],window_p[1]}; | ||
61 | long n=blocksizes[W]; | ||
62 | long ln=blocksizes[lW]; | ||
63 | long rn=blocksizes[nW]; | ||
64 | |||
65 | long leftbegin=n/4-ln/4; | ||
66 | long leftend=leftbegin+ln/2; | ||
67 | |||
68 | long rightbegin=n/2+n/4-rn/4; | ||
69 | long rightend=rightbegin+rn/2; | ||
70 | |||
71 | int i,p; | ||
72 | |||
73 | for(i=0;i<leftbegin;i++) | ||
74 | d[i]=0; | ||
75 | |||
76 | for(p=0;i<leftend;i++,p++) | ||
77 | d[i]=MULT31(d[i],window[lW][p]); | ||
78 | |||
79 | for(i=rightbegin,p=rn/2-1;i<rightend;i++,p--) | ||
80 | d[i]=MULT31(d[i],window[nW][p]); | ||
81 | |||
82 | for(;i<n;i++) | ||
83 | d[i]=0; | ||
84 | } | ||