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118 lines
3.4 KiB
118 lines
3.4 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) 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 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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