3 * Bluetooth low-complexity, subband codec (SBC) library
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>
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.
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.
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
27 #ifndef __SBC_PRIMITIVES_H
28 #define __SBC_PRIMITIVES_H
30 #define SCALE_OUT_BITS 15
31 #define SBC_X_BUFFER_SIZE 328
34 #define SBC_ALWAYS_INLINE __attribute__((always_inline))
36 #define SBC_ALWAYS_INLINE inline
39 struct sbc_encoder_state {
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;
74 * Initialize pointers to the functions which are the basic "building bricks"
75 * of SBC codec. Best implementation is selected based on target CPU
78 void sbc_init_primitives(struct sbc_encoder_state *encoder_state);