1/* 2 * Bluetooth low-complexity, subband codec (SBC) 3 * 4 * Copyright (C) 2017 Aurelien Jacobs <aurel@gnuage.org> 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 * This file is part of FFmpeg. 11 * 12 * FFmpeg is free software; you can redistribute it and/or 13 * modify it under the terms of the GNU Lesser General Public 14 * License as published by the Free Software Foundation; either 15 * version 2.1 of the License, or (at your option) any later version. 16 * 17 * FFmpeg is distributed in the hope that it will be useful, 18 * but WITHOUT ANY WARRANTY; without even the implied warranty of 19 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU 20 * Lesser General Public License for more details. 21 * 22 * You should have received a copy of the GNU Lesser General Public 23 * License along with FFmpeg; if not, write to the Free Software 24 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA 25 */ 26 27/** 28 * @file 29 * SBC basic "building bricks" 30 */ 31 32#ifndef AVCODEC_SBCDSP_H 33#define AVCODEC_SBCDSP_H 34 35#include "libavutil/mem_internal.h" 36 37#include "sbc.h" 38#include "sbcdsp_data.h" 39 40#define SCALE_OUT_BITS 15 41#define SBC_X_BUFFER_SIZE 328 42 43typedef struct sbc_dsp_context SBCDSPContext; 44 45struct sbc_dsp_context { 46 int position; 47 /* Number of consecutive blocks handled by the encoder */ 48 uint8_t increment; 49 DECLARE_ALIGNED(SBC_ALIGN, int16_t, X)[2][SBC_X_BUFFER_SIZE]; 50 void (*sbc_analyze_4)(const int16_t *in, int32_t *out, const int16_t *consts); 51 void (*sbc_analyze_8)(const int16_t *in, int32_t *out, const int16_t *consts); 52 /* Polyphase analysis filter for 4 subbands configuration, 53 * it handles "increment" blocks at once */ 54 void (*sbc_analyze_4s)(SBCDSPContext *s, 55 int16_t *x, int32_t *out, int out_stride); 56 /* Polyphase analysis filter for 8 subbands configuration, 57 * it handles "increment" blocks at once */ 58 void (*sbc_analyze_8s)(SBCDSPContext *s, 59 int16_t *x, int32_t *out, int out_stride); 60 /* Process input data (deinterleave, endian conversion, reordering), 61 * depending on the number of subbands and input data byte order */ 62 int (*sbc_enc_process_input_4s)(int position, const uint8_t *pcm, 63 int16_t X[2][SBC_X_BUFFER_SIZE], 64 int nsamples, int nchannels); 65 int (*sbc_enc_process_input_8s)(int position, const uint8_t *pcm, 66 int16_t X[2][SBC_X_BUFFER_SIZE], 67 int nsamples, int nchannels); 68 /* Scale factors calculation */ 69 void (*sbc_calc_scalefactors)(int32_t sb_sample_f[16][2][8], 70 uint32_t scale_factor[2][8], 71 int blocks, int channels, int subbands); 72 /* Scale factors calculation with joint stereo support */ 73 int (*sbc_calc_scalefactors_j)(int32_t sb_sample_f[16][2][8], 74 uint32_t scale_factor[2][8], 75 int blocks, int subbands); 76}; 77 78/* 79 * Initialize pointers to the functions which are the basic "building bricks" 80 * of SBC codec. Best implementation is selected based on target CPU 81 * capabilities. 82 */ 83void ff_sbcdsp_init(SBCDSPContext *s); 84 85void ff_sbcdsp_init_arm(SBCDSPContext *s); 86void ff_sbcdsp_init_x86(SBCDSPContext *s); 87 88#endif /* AVCODEC_SBCDSP_H */ 89