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author | Sean Bartell <wingedtachikoma@gmail.com> | 2011-06-25 21:32:25 -0400 |
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committer | Nils Wallménius <nils@rockbox.org> | 2012-04-25 22:13:20 +0200 |
commit | f40bfc9267b13b54e6379dfe7539447662879d24 (patch) | |
tree | 9b20069d5e62809ff434061ad730096836f916f2 /lib/rbcodec/codecs/libtremor/window.c | |
parent | a0009907de7a0107d49040d8a180f140e2eff299 (diff) | |
download | rockbox-f40bfc9267b13b54e6379dfe7539447662879d24.tar.gz rockbox-f40bfc9267b13b54e6379dfe7539447662879d24.zip |
Add codecs to librbcodec.
Change-Id: Id7f4717d51ed02d67cb9f9cb3c0ada4a81843f97
Reviewed-on: http://gerrit.rockbox.org/137
Reviewed-by: Nils Wallménius <nils@rockbox.org>
Tested-by: Nils Wallménius <nils@rockbox.org>
Diffstat (limited to 'lib/rbcodec/codecs/libtremor/window.c')
-rw-r--r-- | lib/rbcodec/codecs/libtremor/window.c | 82 |
1 files changed, 82 insertions, 0 deletions
diff --git a/lib/rbcodec/codecs/libtremor/window.c b/lib/rbcodec/codecs/libtremor/window.c new file mode 100644 index 0000000000..3bc947f0e5 --- /dev/null +++ b/lib/rbcodec/codecs/libtremor/window.c | |||
@@ -0,0 +1,82 @@ | |||
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 "config-tremor.h" | ||
19 | #include <string.h> | ||
20 | #include <math.h> | ||
21 | #include "os.h" | ||
22 | #include "misc.h" | ||
23 | #include "window.h" | ||
24 | #include "window_lookup.h" | ||
25 | |||
26 | const void *_vorbis_window(int type, int left){ | ||
27 | |||
28 | switch(type){ | ||
29 | case 0: | ||
30 | |||
31 | switch(left){ | ||
32 | case 32: | ||
33 | return vwin64; | ||
34 | case 64: | ||
35 | return vwin128; | ||
36 | case 128: | ||
37 | return vwin256; | ||
38 | case 256: | ||
39 | return vwin512; | ||
40 | case 512: | ||
41 | return vwin1024; | ||
42 | case 1024: | ||
43 | return vwin2048; | ||
44 | case 2048: | ||
45 | return vwin4096; | ||
46 | case 4096: | ||
47 | return vwin8192; | ||
48 | default: | ||
49 | return(0); | ||
50 | } | ||
51 | break; | ||
52 | default: | ||
53 | return(0); | ||
54 | } | ||
55 | } | ||
56 | #if 0 | ||
57 | void _vorbis_apply_window(ogg_int32_t *d,const void *window_p[2], | ||
58 | long *blocksizes, | ||
59 | int lW,int W,int nW){ | ||
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 | /* Following memset is not required - we are careful to only overlap/add the | ||
72 | regions that geniunely overlap in the window region, and the portions | ||
73 | outside that region are not added (so don't need to be zerod). see block.c | ||
74 | memset((void *)&d[0], 0, sizeof(ogg_int32_t)*leftbegin); */ | ||
75 | |||
76 | ogg_vect_mult_fw(&d[leftbegin], &window[lW][0], leftend-leftbegin); | ||
77 | ogg_vect_mult_bw(&d[rightbegin], &window[nW][rn/2-1], rightend-rightbegin); | ||
78 | |||
79 | /* Again - memset not needed | ||
80 | memset((void *)&d[rightend], 0, sizeof(ogg_int32_t)*(n-rightend)); */ | ||
81 | } | ||
82 | #endif | ||