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Diffstat (limited to 'apps/codecs/libfaad/ms.c')
-rw-r--r-- | apps/codecs/libfaad/ms.c | 74 |
1 files changed, 74 insertions, 0 deletions
diff --git a/apps/codecs/libfaad/ms.c b/apps/codecs/libfaad/ms.c new file mode 100644 index 0000000000..f01e5caa07 --- /dev/null +++ b/apps/codecs/libfaad/ms.c | |||
@@ -0,0 +1,74 @@ | |||
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 "ms.h" | ||
33 | #include "is.h" | ||
34 | #include "pns.h" | ||
35 | |||
36 | void ms_decode(ic_stream *ics, ic_stream *icsr, real_t *l_spec, real_t *r_spec, | ||
37 | uint16_t frame_len) | ||
38 | { | ||
39 | uint8_t g, b, sfb; | ||
40 | uint8_t group = 0; | ||
41 | uint16_t nshort = frame_len/8; | ||
42 | |||
43 | uint16_t i, k; | ||
44 | real_t tmp; | ||
45 | |||
46 | if (ics->ms_mask_present >= 1) | ||
47 | { | ||
48 | for (g = 0; g < ics->num_window_groups; g++) | ||
49 | { | ||
50 | for (b = 0; b < ics->window_group_length[g]; b++) | ||
51 | { | ||
52 | for (sfb = 0; sfb < ics->max_sfb; sfb++) | ||
53 | { | ||
54 | /* If intensity stereo coding or noise substitution is on | ||
55 | for a particular scalefactor band, no M/S stereo decoding | ||
56 | is carried out. | ||
57 | */ | ||
58 | if ((ics->ms_used[g][sfb] || ics->ms_mask_present == 2) && | ||
59 | !is_intensity(icsr, g, sfb) && !is_noise(ics, g, sfb)) | ||
60 | { | ||
61 | for (i = ics->swb_offset[sfb]; i < ics->swb_offset[sfb+1]; i++) | ||
62 | { | ||
63 | k = (group*nshort) + i; | ||
64 | tmp = l_spec[k] - r_spec[k]; | ||
65 | l_spec[k] = l_spec[k] + r_spec[k]; | ||
66 | r_spec[k] = tmp; | ||
67 | } | ||
68 | } | ||
69 | } | ||
70 | group++; | ||
71 | } | ||
72 | } | ||
73 | } | ||
74 | } | ||