1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
|
/*
*
* Bluetooth low-complexity, subband codec (SBC) library
*
* Copyright (C) 2004-2009 Marcel Holtmann <marcel@holtmann.org>
* Copyright (C) 2004-2005 Henryk Ploetz <henryk@ploetzli.ch>
* Copyright (C) 2005-2006 Brad Midgley <bmidgley@xmission.com>
*
*
* This library is free software; you can redistribute it and/or
* modify it under the terms of the GNU Lesser General Public
* License as published by the Free Software Foundation; either
* version 2.1 of the License, or (at your option) any later version.
*
* This library is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
* Lesser General Public License for more details.
*
* You should have received a copy of the GNU Lesser General Public
* License along with this library; if not, write to the Free Software
* Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
*
*/
#ifndef __SBC_PRIMITIVES_H
#define __SBC_PRIMITIVES_H
#define SCALE_OUT_BITS 15
struct sbc_encoder_state {
int subbands;
int position[2];
int16_t X[2][256];
/* Polyphase analysis filter for 4 subbands configuration,
it handles 4 blocks at once */
void (*sbc_analyze_4b_4s)(int16_t *pcm, int16_t *x,
int32_t *out, int out_stride);
/* Polyphase analysis filter for 8 subbands configuration,
it handles 4 blocks at once */
void (*sbc_analyze_4b_8s)(int16_t *pcm, int16_t *x,
int32_t *out, int out_stride);
};
/*
* Initialize pointers to the functions which are the basic "building bricks"
* of SBC codec. Best implementation is selected based on target CPU
* capabilities.
*/
void sbc_init_primitives(struct sbc_encoder_state *encoder_state);
#endif
|
