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 inline __attribute__((always_inline))
36 #define SBC_ALWAYS_INLINE inline
39 struct sbc_encoder_state {
41 /* Number of consecutive blocks handled by the encoder */
43 int16_t SBC_ALIGNED X[2][SBC_X_BUFFER_SIZE];
44 /* Polyphase analysis filter for 4 subbands configuration,
45 * it handles "increment" blocks at once */
46 void (*sbc_analyze_4s)(struct sbc_encoder_state *state,
47 int16_t *x, int32_t *out, int out_stride);
48 /* Polyphase analysis filter for 8 subbands configuration,
49 * it handles "increment" blocks at once */
50 void (*sbc_analyze_8s)(struct sbc_encoder_state *state,
51 int16_t *x, int32_t *out, int out_stride);
52 /* Process input data (deinterleave, endian conversion, reordering),
53 * depending on the number of subbands and input data byte order */
54 int (*sbc_enc_process_input_4s_le)(int position,
55 const uint8_t *pcm, int16_t X[2][SBC_X_BUFFER_SIZE],
56 int nsamples, int nchannels);
57 int (*sbc_enc_process_input_4s_be)(int position,
58 const uint8_t *pcm, int16_t X[2][SBC_X_BUFFER_SIZE],
59 int nsamples, int nchannels);
60 int (*sbc_enc_process_input_8s_le)(int position,
61 const uint8_t *pcm, int16_t X[2][SBC_X_BUFFER_SIZE],
62 int nsamples, int nchannels);
63 int (*sbc_enc_process_input_8s_be)(int position,
64 const uint8_t *pcm, int16_t X[2][SBC_X_BUFFER_SIZE],
65 int nsamples, int nchannels);
66 /* Scale factors calculation */
67 void (*sbc_calc_scalefactors)(int32_t sb_sample_f[16][2][8],
68 uint32_t scale_factor[2][8],
69 int blocks, int channels, int subbands);
70 /* Scale factors calculation with joint stereo support */
71 int (*sbc_calc_scalefactors_j)(int32_t sb_sample_f[16][2][8],
72 uint32_t scale_factor[2][8],
73 int blocks, int subbands);
74 const char *implementation_info;
78 * Initialize pointers to the functions which are the basic "building bricks"
79 * of SBC codec. Best implementation is selected based on target CPU
82 void sbc_init_primitives(struct sbc_encoder_state *encoder_state);