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86 lines
3.5 KiB
86 lines
3.5 KiB
/* |
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* Bluetooth low-complexity, subband codec (SBC) |
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* |
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* Copyright (C) 2017 Aurelien Jacobs <aurel@gnuage.org> |
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* Copyright (C) 2008-2010 Nokia Corporation |
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* Copyright (C) 2004-2010 Marcel Holtmann <marcel@holtmann.org> |
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* Copyright (C) 2004-2005 Henryk Ploetz <henryk@ploetzli.ch> |
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* Copyright (C) 2005-2006 Brad Midgley <bmidgley@xmission.com> |
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* |
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* This file is part of FFmpeg. |
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* |
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* FFmpeg is free software; you can redistribute it and/or |
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* modify it under the terms of the GNU Lesser General Public |
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* License as published by the Free Software Foundation; either |
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* version 2.1 of the License, or (at your option) any later version. |
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* |
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* FFmpeg is distributed in the hope that it will be useful, |
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* but WITHOUT ANY WARRANTY; without even the implied warranty of |
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU |
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* Lesser General Public License for more details. |
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* |
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* You should have received a copy of the GNU Lesser General Public |
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* License along with FFmpeg; if not, write to the Free Software |
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* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA |
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*/ |
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/** |
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* @file |
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* SBC basic "building bricks" |
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*/ |
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#ifndef AVCODEC_SBCDSP_H |
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#define AVCODEC_SBCDSP_H |
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#include "sbc.h" |
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#include "sbcdsp_data.h" |
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#define SCALE_OUT_BITS 15 |
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#define SBC_X_BUFFER_SIZE 328 |
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typedef struct sbc_dsp_context SBCDSPContext; |
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struct sbc_dsp_context { |
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int position; |
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/* Number of consecutive blocks handled by the encoder */ |
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uint8_t increment; |
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DECLARE_ALIGNED(SBC_ALIGN, int16_t, X)[2][SBC_X_BUFFER_SIZE]; |
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void (*sbc_analyze_4)(const int16_t *in, int32_t *out, const int16_t *consts); |
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void (*sbc_analyze_8)(const int16_t *in, int32_t *out, const int16_t *consts); |
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/* Polyphase analysis filter for 4 subbands configuration, |
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* it handles "increment" blocks at once */ |
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void (*sbc_analyze_4s)(SBCDSPContext *s, |
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int16_t *x, int32_t *out, int out_stride); |
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/* Polyphase analysis filter for 8 subbands configuration, |
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* it handles "increment" blocks at once */ |
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void (*sbc_analyze_8s)(SBCDSPContext *s, |
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int16_t *x, int32_t *out, int out_stride); |
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/* Process input data (deinterleave, endian conversion, reordering), |
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* depending on the number of subbands and input data byte order */ |
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int (*sbc_enc_process_input_4s)(int position, const uint8_t *pcm, |
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int16_t X[2][SBC_X_BUFFER_SIZE], |
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int nsamples, int nchannels); |
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int (*sbc_enc_process_input_8s)(int position, const uint8_t *pcm, |
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int16_t X[2][SBC_X_BUFFER_SIZE], |
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int nsamples, int nchannels); |
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/* Scale factors calculation */ |
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void (*sbc_calc_scalefactors)(int32_t sb_sample_f[16][2][8], |
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uint32_t scale_factor[2][8], |
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int blocks, int channels, int subbands); |
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/* Scale factors calculation with joint stereo support */ |
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int (*sbc_calc_scalefactors_j)(int32_t sb_sample_f[16][2][8], |
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uint32_t scale_factor[2][8], |
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int blocks, int subbands); |
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}; |
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/* |
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* Initialize pointers to the functions which are the basic "building bricks" |
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* of SBC codec. Best implementation is selected based on target CPU |
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* capabilities. |
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*/ |
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void ff_sbcdsp_init(SBCDSPContext *s); |
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void ff_sbcdsp_init_arm(SBCDSPContext *s); |
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void ff_sbcdsp_init_x86(SBCDSPContext *s); |
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#endif /* AVCODEC_SBCDSP_H */
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