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/*
*
* 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
#define SBC_X_BUFFER_SIZE 328
#ifdef __GNUC__
#define SBC_ALWAYS_INLINE __attribute__((always_inline))
#else
#define SBC_ALWAYS_INLINE inline
#endif
struct sbc_encoder_state {
int position;
int16_t SBC_ALIGNED X[2][SBC_X_BUFFER_SIZE];
/* Polyphase analysis filter for 4 subbands configuration,
* it handles 4 blocks at once */
void (*sbc_analyze_4b_4s)(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 *x, int32_t *out, int out_stride);
/* Process input data (deinterleave, endian conversion, reordering),
* depending on the number of subbands and input data byte order */
int (*sbc_enc_process_input_4s_le)(int position,
const uint8_t *pcm, int16_t X[2][SBC_X_BUFFER_SIZE],
int nsamples, int nchannels);
int (*sbc_enc_process_input_4s_be)(int position,
const uint8_t *pcm, int16_t X[2][SBC_X_BUFFER_SIZE],
int nsamples, int nchannels);
int (*sbc_enc_process_input_8s_le)(int position,
const uint8_t *pcm, int16_t X[2][SBC_X_BUFFER_SIZE],
int nsamples, int nchannels);
int (*sbc_enc_process_input_8s_be)(int position,
const uint8_t *pcm, int16_t X[2][SBC_X_BUFFER_SIZE],
int nsamples, int nchannels);
/* Scale factors calculation */
void (*sbc_calc_scalefactors)(int32_t sb_sample_f[16][2][8],
uint32_t scale_factor[2][8],
int blocks, int channels, int subbands);
};
/*
* 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
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