1/*
2 *
3 *  Bluetooth low-complexity, subband codec (SBC) library
4 *
5 *  Copyright (C) 2008-2010  Nokia Corporation
6 *  Copyright (C) 2004-2010  Marcel Holtmann <marcel@holtmann.org>
7 *  Copyright (C) 2004-2005  Henryk Ploetz <henryk@ploetzli.ch>
8 *  Copyright (C) 2005-2006  Brad Midgley <bmidgley@xmission.com>
9 *
10 *
11 *  This library is free software; you can redistribute it and/or
12 *  modify it under the terms of the GNU Lesser General Public
13 *  License as published by the Free Software Foundation; either
14 *  version 2.1 of the License, or (at your option) any later version.
15 *
16 *  This library is distributed in the hope that it will be useful,
17 *  but WITHOUT ANY WARRANTY; without even the implied warranty of
18 *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
19 *  Lesser General Public License for more details.
20 *
21 *  You should have received a copy of the GNU Lesser General Public
22 *  License along with this library; if not, write to the Free Software
23 *  Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA  02110-1301  USA
24 *
25 */
26
27#ifndef __SBC_PRIMITIVES_H
28#define __SBC_PRIMITIVES_H
29
30#define SCALE_OUT_BITS 15
31#define SBC_X_BUFFER_SIZE 328
32
33#ifdef __GNUC__
34#define SBC_ALWAYS_INLINE __attribute__((always_inline))
35#else
36#define SBC_ALWAYS_INLINE inline
37#endif
38
39struct sbc_encoder_state {
40	int position;
41	int16_t SBC_ALIGNED X[2][SBC_X_BUFFER_SIZE];
42	/* Polyphase analysis filter for 4 subbands configuration,
43	 * it handles 4 blocks at once */
44	void (*sbc_analyze_4b_4s)(int16_t *x, int32_t *out, int out_stride);
45	/* Polyphase analysis filter for 8 subbands configuration,
46	 * it handles 4 blocks at once */
47	void (*sbc_analyze_4b_8s)(int16_t *x, int32_t *out, int out_stride);
48	/* Process input data (deinterleave, endian conversion, reordering),
49	 * depending on the number of subbands and input data byte order */
50	int (*sbc_enc_process_input_4s_le)(int position,
51			const uint8_t *pcm, int16_t X[2][SBC_X_BUFFER_SIZE],
52			int nsamples, int nchannels);
53	int (*sbc_enc_process_input_4s_be)(int position,
54			const uint8_t *pcm, int16_t X[2][SBC_X_BUFFER_SIZE],
55			int nsamples, int nchannels);
56	int (*sbc_enc_process_input_8s_le)(int position,
57			const uint8_t *pcm, int16_t X[2][SBC_X_BUFFER_SIZE],
58			int nsamples, int nchannels);
59	int (*sbc_enc_process_input_8s_be)(int position,
60			const uint8_t *pcm, int16_t X[2][SBC_X_BUFFER_SIZE],
61			int nsamples, int nchannels);
62	/* Scale factors calculation */
63	void (*sbc_calc_scalefactors)(int32_t sb_sample_f[16][2][8],
64			uint32_t scale_factor[2][8],
65			int blocks, int channels, int subbands);
66	/* Scale factors calculation with joint stereo support */
67	int (*sbc_calc_scalefactors_j)(int32_t sb_sample_f[16][2][8],
68			uint32_t scale_factor[2][8],
69			int blocks, int subbands);
70	const char *implementation_info;
71};
72
73/*
74 * Initialize pointers to the functions which are the basic "building bricks"
75 * of SBC codec. Best implementation is selected based on target CPU
76 * capabilities.
77 */
78void sbc_init_primitives(struct sbc_encoder_state *encoder_state);
79
80#endif
81