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119 lines
3.4 KiB
C
119 lines
3.4 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) 2012-2014 Intel Corporation
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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 common definitions for the encoder and decoder
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*/
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#ifndef AVCODEC_SBC_H
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#define AVCODEC_SBC_H
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#include "avcodec.h"
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#include "libavutil/crc.h"
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#define MSBC_BLOCKS 15
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/* sampling frequency */
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#define SBC_FREQ_16000 0x00
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#define SBC_FREQ_32000 0x01
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#define SBC_FREQ_44100 0x02
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#define SBC_FREQ_48000 0x03
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/* blocks */
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#define SBC_BLK_4 0x00
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#define SBC_BLK_8 0x01
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#define SBC_BLK_12 0x02
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#define SBC_BLK_16 0x03
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/* channel mode */
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#define SBC_MODE_MONO 0x00
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#define SBC_MODE_DUAL_CHANNEL 0x01
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#define SBC_MODE_STEREO 0x02
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#define SBC_MODE_JOINT_STEREO 0x03
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/* allocation method */
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#define SBC_AM_LOUDNESS 0x00
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#define SBC_AM_SNR 0x01
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/* subbands */
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#define SBC_SB_4 0x00
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#define SBC_SB_8 0x01
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/* synchronisation words */
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#define SBC_SYNCWORD 0x9C
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#define MSBC_SYNCWORD 0xAD
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/* extra bits of precision for the synthesis filter input data */
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#define SBCDEC_FIXED_EXTRA_BITS 2
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/*
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* Enforce 16 byte alignment for the data, which is supposed to be used
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* with SIMD optimized code.
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*/
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#define SBC_ALIGN 16
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/* This structure contains an unpacked SBC frame.
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Yes, there is probably quite some unused space herein */
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struct sbc_frame {
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uint8_t frequency;
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uint8_t blocks;
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enum {
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MONO = SBC_MODE_MONO,
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DUAL_CHANNEL = SBC_MODE_DUAL_CHANNEL,
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STEREO = SBC_MODE_STEREO,
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JOINT_STEREO = SBC_MODE_JOINT_STEREO
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} mode;
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uint8_t channels;
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enum {
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LOUDNESS = SBC_AM_LOUDNESS,
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SNR = SBC_AM_SNR
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} allocation;
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uint8_t subbands;
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uint8_t bitpool;
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uint16_t codesize;
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/* bit number x set means joint stereo has been used in subband x */
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uint8_t joint;
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/* only the lower 4 bits of every element are to be used */
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DECLARE_ALIGNED(SBC_ALIGN, uint32_t, scale_factor)[2][8];
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/* raw integer subband samples in the frame */
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DECLARE_ALIGNED(SBC_ALIGN, int32_t, sb_sample_f)[16][2][8];
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/* modified subband samples */
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DECLARE_ALIGNED(SBC_ALIGN, int32_t, sb_sample)[16][2][8];
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const AVCRC *crc_ctx;
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};
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uint8_t ff_sbc_crc8(const AVCRC *crc_ctx, const uint8_t *data, size_t len);
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void ff_sbc_calculate_bits(const struct sbc_frame *frame, int (*bits)[8]);
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#endif /* AVCODEC_SBC_H */
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