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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/libfaad/is.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/libfaad/is.c')
-rw-r--r-- | lib/rbcodec/codecs/libfaad/is.c | 108 |
1 files changed, 108 insertions, 0 deletions
diff --git a/lib/rbcodec/codecs/libfaad/is.c b/lib/rbcodec/codecs/libfaad/is.c new file mode 100644 index 0000000000..89c6fcf228 --- /dev/null +++ b/lib/rbcodec/codecs/libfaad/is.c | |||
@@ -0,0 +1,108 @@ | |||
1 | /* | ||
2 | ** FAAD2 - Freeware Advanced Audio (AAC) Decoder including SBR decoding | ||
3 | ** Copyright (C) 2003-2004 M. Bakker, Ahead Software AG, http://www.nero.com | ||
4 | ** | ||
5 | ** This program is free software; you can redistribute it and/or modify | ||
6 | ** it under the terms of the GNU General Public License as published by | ||
7 | ** the Free Software Foundation; either version 2 of the License, or | ||
8 | ** (at your option) any later version. | ||
9 | ** | ||
10 | ** This program is distributed in the hope that it will be useful, | ||
11 | ** but WITHOUT ANY WARRANTY; without even the implied warranty of | ||
12 | ** MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | ||
13 | ** GNU General Public License for more details. | ||
14 | ** | ||
15 | ** You should have received a copy of the GNU General Public License | ||
16 | ** along with this program; if not, write to the Free Software | ||
17 | ** Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA. | ||
18 | ** | ||
19 | ** Any non-GPL usage of this software or parts of this software is strictly | ||
20 | ** forbidden. | ||
21 | ** | ||
22 | ** Commercial non-GPL licensing of this software is possible. | ||
23 | ** For more info contact Ahead Software through Mpeg4AAClicense@nero.com. | ||
24 | ** | ||
25 | ** $Id$ | ||
26 | **/ | ||
27 | |||
28 | #include "common.h" | ||
29 | #include "structs.h" | ||
30 | |||
31 | #include "syntax.h" | ||
32 | #include "is.h" | ||
33 | |||
34 | #ifdef FIXED_POINT | ||
35 | static real_t pow05_table[] ICONST_ATTR = { | ||
36 | COEF_CONST(1.68179283050743), /* 0.5^(-3/4) */ | ||
37 | COEF_CONST(1.41421356237310), /* 0.5^(-2/4) */ | ||
38 | COEF_CONST(1.18920711500272), /* 0.5^(-1/4) */ | ||
39 | COEF_CONST(1.0), /* 0.5^( 0/4) */ | ||
40 | COEF_CONST(0.84089641525371), /* 0.5^(+1/4) */ | ||
41 | COEF_CONST(0.70710678118655), /* 0.5^(+2/4) */ | ||
42 | COEF_CONST(0.59460355750136) /* 0.5^(+3/4) */ | ||
43 | }; | ||
44 | #endif | ||
45 | |||
46 | void is_decode(ic_stream *ics, ic_stream *icsr, real_t *l_spec, real_t *r_spec, | ||
47 | uint16_t frame_len) | ||
48 | { | ||
49 | uint8_t g, sfb, b; | ||
50 | uint16_t i, k; | ||
51 | #ifndef FIXED_POINT | ||
52 | real_t scale; | ||
53 | #else | ||
54 | int32_t exp, frac; | ||
55 | #endif | ||
56 | |||
57 | uint16_t nshort = frame_len/8; | ||
58 | uint8_t group = 0; | ||
59 | |||
60 | for (g = 0; g < icsr->num_window_groups; g++) | ||
61 | { | ||
62 | /* Do intensity stereo decoding */ | ||
63 | for (b = 0; b < icsr->window_group_length[g]; b++) | ||
64 | { | ||
65 | for (sfb = 0; sfb < icsr->max_sfb; sfb++) | ||
66 | { | ||
67 | if (is_intensity(icsr, g, sfb)) | ||
68 | { | ||
69 | #ifdef MAIN_DEC | ||
70 | /* For scalefactor bands coded in intensity stereo the | ||
71 | corresponding predictors in the right channel are | ||
72 | switched to "off". | ||
73 | */ | ||
74 | ics->pred.prediction_used[sfb] = 0; | ||
75 | icsr->pred.prediction_used[sfb] = 0; | ||
76 | #endif | ||
77 | |||
78 | #ifndef FIXED_POINT | ||
79 | scale = (real_t)pow(0.5, (0.25*icsr->scale_factors[g][sfb])); | ||
80 | #else | ||
81 | exp = icsr->scale_factors[g][sfb] >> 2; | ||
82 | frac = icsr->scale_factors[g][sfb] & 3; | ||
83 | #endif | ||
84 | |||
85 | /* Scale from left to right channel, | ||
86 | do not touch left channel */ | ||
87 | k = (group*nshort) + icsr->swb_offset[sfb]; | ||
88 | for (i = icsr->swb_offset[sfb]; i < icsr->swb_offset[sfb+1]; i++, k++) | ||
89 | { | ||
90 | #ifndef FIXED_POINT | ||
91 | r_spec[k] = MUL_R(l_spec[k], scale); | ||
92 | #else | ||
93 | if (exp < 0) | ||
94 | r_spec[k] = l_spec[k] << -exp; | ||
95 | else | ||
96 | r_spec[k] = l_spec[k] >> exp; | ||
97 | |||
98 | r_spec[k] = MUL_C(r_spec[k], pow05_table[frac + 3]); | ||
99 | #endif | ||
100 | if (is_intensity(icsr, g, sfb) != invert_intensity(ics, g, sfb)) | ||
101 | r_spec[k] = -r_spec[k]; | ||
102 | } | ||
103 | } | ||
104 | } | ||
105 | group++; | ||
106 | } | ||
107 | } | ||
108 | } | ||