/*
* Bluetooth low-complexity, subband codec (SBC)
*
* Copyright (C) 2017 Aurelien Jacobs <aurel@gnuage.org>
* Copyright (C) 2008-2010 Nokia Corporation
* Copyright (C) 2004-2010 Marcel Holtmann <marcel@holtmann.org>
* Copyright (C) 2004-2005 Henryk Ploetz <henryk@ploetzli.ch>
* Copyright (C) 2005-2006 Brad Midgley <bmidgley@xmission.com>
*
* This file is part of FFmpeg.
*
* FFmpeg 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.
*
* FFmpeg 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 FFmpeg; if not, write to the Free Software
* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
*/
/**
* @file
* SBC basic "building bricks"
*/
#ifndef AVCODEC_SBCDSP_H
#define AVCODEC_SBCDSP_H
#include "sbc.h"
#include "sbcdsp_data.h"
#define SCALE_OUT_BITS 15
#define SBC_X_BUFFER_SIZE 328
typedef struct sbc_dsp_context SBCDSPContext;
struct sbc_dsp_context {
int position;
/* Number of consecutive blocks handled by the encoder */
uint8_t increment;
DECLARE_ALIGNED(SBC_ALIGN, int16_t, X)[2][SBC_X_BUFFER_SIZE];
void (*sbc_analyze_4)(const int16_t *in, int32_t *out, const int16_t *consts);
void (*sbc_analyze_8)(const int16_t *in, int32_t *out, const int16_t *consts);
/* Polyphase analysis filter for 4 subbands configuration,
* it handles "increment" blocks at once */
void (*sbc_analyze_4s)(SBCDSPContext *s,
int16_t *x, int32_t *out, int out_stride);
/* Polyphase analysis filter for 8 subbands configuration,
* it handles "increment" blocks at once */
void (*sbc_analyze_8s)(SBCDSPContext *s,
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)(int position, const uint8_t *pcm,
int16_t X[2][SBC_X_BUFFER_SIZE],
int nsamples, int nchannels);
int (*sbc_enc_process_input_8s)(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);
/* Scale factors calculation with joint stereo support */
int (*sbc_calc_scalefactors_j)(int32_t sb_sample_f[16][2][8],
uint32_t scale_factor[2][8],
int blocks, 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 ff_sbcdsp_init(SBCDSPContext *s);
void ff_sbcdsp_init_arm(SBCDSPContext *s);
void ff_sbcdsp_init_x86(SBCDSPContext *s);
#endif /* AVCODEC_SBCDSP_H */