| /* |
| * 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 "libavutil/mem_internal.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 */ |
