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87 lines
3.5 KiB
C
87 lines
3.5 KiB
C
/*
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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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