2 ** FAAD2 - Freeware Advanced Audio (AAC) Decoder including SBR decoding
3 ** Copyright (C) 2003-2004 M. Bakker, Ahead Software AG, http://www.nero.com
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.
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.
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.
19 ** Any non-GPL usage of this software or parts of this software is strictly
22 ** Commercial non-GPL licensing of this software is possible.
23 ** For more info contact Ahead Software through Mpeg4AAClicense@nero.com.
37 #define EXTENSION_ID_PS 2
39 #define MAX_PS_ENVELOPES 5
40 #define NO_ALLPASS_LINKS 3
42 #define MAX_NTSRPS 38 /* max number_time_slots * rate + 6 (delay) */
47 uint8_t resolution20
[3];
48 uint8_t resolution34
[5];
57 /* bitstream parameters */
65 uint8_t nr_ipdopd_par
;
71 uint8_t border_position
[MAX_PS_ENVELOPES
+1];
73 uint8_t iid_dt
[MAX_PS_ENVELOPES
];
74 uint8_t icc_dt
[MAX_PS_ENVELOPES
];
76 uint8_t enable_ipdopd
;
78 uint8_t ipd_dt
[MAX_PS_ENVELOPES
];
79 uint8_t opd_dt
[MAX_PS_ENVELOPES
];
82 int8_t iid_index_prev
[34];
83 int8_t icc_index_prev
[34];
84 int8_t ipd_index_prev
[17];
85 int8_t opd_index_prev
[17];
86 int8_t iid_index
[MAX_PS_ENVELOPES
][34];
87 int8_t icc_index
[MAX_PS_ENVELOPES
][34];
88 int8_t ipd_index
[MAX_PS_ENVELOPES
][17];
89 int8_t opd_index
[MAX_PS_ENVELOPES
][17];
91 int8_t ipd_index_1
[17];
92 int8_t opd_index_1
[17];
93 int8_t ipd_index_2
[17];
94 int8_t opd_index_2
[17];
96 /* ps data was correctly read */
97 uint8_t ps_data_available
;
99 /* a header has been read */
102 /* hybrid filterbank parameters */
104 uint8_t use34hybrid_bands
;
108 uint8_t num_hybrid_groups
;
109 uint8_t nr_par_bands
;
110 uint8_t nr_allpass_bands
;
111 uint8_t decay_cutoff
;
113 uint8_t *group_border
;
114 uint16_t *map_group2bk
;
116 /* filter delay handling */
118 uint8_t delay_buf_index_ser
[NO_ALLPASS_LINKS
];
119 uint8_t num_sample_delay_ser
[NO_ALLPASS_LINKS
];
121 uint8_t delay_buf_index_delay
[64];
123 complex_t delay_Qmf
[14][64]; /* 14 samples delay max, 64 QMF channels */
124 complex_t delay_SubQmf
[2][32]; /* 2 samples delay max (SubQmf is always allpass filtered) */
125 complex_t delay_Qmf_ser
[NO_ALLPASS_LINKS
][5][64]; /* 5 samples delay max (table 8.34), 64 QMF channels */
126 complex_t delay_SubQmf_ser
[NO_ALLPASS_LINKS
][5][32]; /* 5 samples delay max (table 8.34) */
132 real_t P_PeakDecayNrg
[34];
134 real_t P_SmoothPeakDecayDiffNrg_prev
[34];
136 /* mixing and phase */
137 complex_t h11_prev
[50];
138 complex_t h12_prev
[50];
139 complex_t h21_prev
[50];
140 complex_t h22_prev
[50];
142 complex_t ipd_prev
[20][2];
143 complex_t opd_prev
[20][2];
148 uint16_t ps_data(ps_info
*ps
, bitfile
*ld
, uint8_t *header
);
151 void ps_init(ps_info
*ps
);
153 uint8_t ps_decode(ps_info
*ps
,
154 qmf_t X_left
[MAX_NTSRPS
][64],
155 qmf_t X_right
[MAX_NTSRPS
][64]);