diff options
Diffstat (limited to 'apps/codecs/libwmapro/quant.h')
-rw-r--r-- | apps/codecs/libwmapro/quant.h | 45 |
1 files changed, 45 insertions, 0 deletions
diff --git a/apps/codecs/libwmapro/quant.h b/apps/codecs/libwmapro/quant.h new file mode 100644 index 0000000000..dba2d071aa --- /dev/null +++ b/apps/codecs/libwmapro/quant.h | |||
@@ -0,0 +1,45 @@ | |||
1 | #ifndef _QUANT_H_ | ||
2 | #define _QUANT_H_ | ||
3 | |||
4 | #include <inttypes.h> | ||
5 | |||
6 | /* This table contains unscaled integer casts of the floating point inverse | ||
7 | * quantization factors used by wma pro. The formula for calculating the | ||
8 | * floating point value is : | ||
9 | * quant = pow(10.0, exp/20) | ||
10 | * 'exp' is an integer value which I have exmerimentally found to fall in the | ||
11 | * range (50,139). */ | ||
12 | const int32_t quant_tab[90] = { | ||
13 | 0x0000013C, 0x00000163, 0x0000018E, 0x000001BF, | ||
14 | 0x000001F5, 0x00000232, 0x00000277, 0x000002C4, | ||
15 | 0x0000031A, 0x0000037B, 0x000003E8, 0x00000462, | ||
16 | 0x000004EB, 0x00000585, 0x00000631, 0x000006F2, | ||
17 | 0x000007CB, 0x000008BF, 0x000009D0, 0x00000B02, | ||
18 | 0x00000C5A, 0x00000DDC, 0x00000F8D, 0x00001173, | ||
19 | 0x00001394, 0x000015F7, 0x000018A6, 0x00001BA7, | ||
20 | 0x00001F07, 0x000022D1, 0x00002710, 0x00002BD4, | ||
21 | 0x0000312D, 0x0000372D, 0x00003DE9, 0x00004577, | ||
22 | 0x00004DF1, 0x00005773, 0x0000621F, 0x00006E18, | ||
23 | 0x00007B87, 0x00008A99, 0x00009B83, 0x0000AE7C, | ||
24 | 0x0000C3C7, 0x0000DBAA, 0x0000F678, 0x0001148B, | ||
25 | 0x00013649, 0x00015C25, 0x000186A0, 0x0001B64A, | ||
26 | 0x0001EBC5, 0x000227C6, 0x00026B19, 0x0002B6A4, | ||
27 | 0x00030B66, 0x00036A80, 0x0003D535, 0x00044CEE, | ||
28 | 0x0004D344, 0x000569FD, 0x0006131B, 0x0006D0DC, | ||
29 | 0x0007A5C3, 0x000894A5, 0x0009A0AD, 0x000ACD6A, | ||
30 | 0x000C1ED8, 0x000D9973, 0x000F4240, 0x00111EE2, | ||
31 | 0x001335AD, 0x00158DBA, 0x00182EFD, 0x001B2267, | ||
32 | 0x001E71FE, 0x00222901, 0x0026540E, 0x002B014F, | ||
33 | 0x003040A6, 0x003623E6, 0x003CBF10, 0x00442894, | ||
34 | 0x004C79A0, 0x0055CE75, 0x006046C5, 0x006C0622, | ||
35 | 0x00793472, 0x0087FE7D, | ||
36 | }; | ||
37 | |||
38 | #define EXP_MIN 50 | ||
39 | #define EXP_MAX 139 | ||
40 | |||
41 | /* return the correct value of quant based on exp */ | ||
42 | #define QUANT(exp) quant_tab[exp - EXP_MIN] | ||
43 | |||
44 | |||
45 | #endif /* _QUANT_H_ */ | ||