| /* |
| * Bluetooth low-complexity, subband codec (SBC) |
| * |
| * Copyright (C) 2017 Aurelien Jacobs <aurel@gnuage.org> |
| * Copyright (C) 2012-2014 Intel Corporation |
| * 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 common definitions for the encoder and decoder |
| */ |
| |
| #ifndef AVCODEC_SBC_H |
| #define AVCODEC_SBC_H |
| |
| #include "avcodec.h" |
| #include "libavutil/crc.h" |
| |
| #define MSBC_BLOCKS 15 |
| |
| /* sampling frequency */ |
| #define SBC_FREQ_16000 0x00 |
| #define SBC_FREQ_32000 0x01 |
| #define SBC_FREQ_44100 0x02 |
| #define SBC_FREQ_48000 0x03 |
| |
| /* blocks */ |
| #define SBC_BLK_4 0x00 |
| #define SBC_BLK_8 0x01 |
| #define SBC_BLK_12 0x02 |
| #define SBC_BLK_16 0x03 |
| |
| /* channel mode */ |
| #define SBC_MODE_MONO 0x00 |
| #define SBC_MODE_DUAL_CHANNEL 0x01 |
| #define SBC_MODE_STEREO 0x02 |
| #define SBC_MODE_JOINT_STEREO 0x03 |
| |
| /* allocation method */ |
| #define SBC_AM_LOUDNESS 0x00 |
| #define SBC_AM_SNR 0x01 |
| |
| /* subbands */ |
| #define SBC_SB_4 0x00 |
| #define SBC_SB_8 0x01 |
| |
| /* synchronisation words */ |
| #define SBC_SYNCWORD 0x9C |
| #define MSBC_SYNCWORD 0xAD |
| |
| /* extra bits of precision for the synthesis filter input data */ |
| #define SBCDEC_FIXED_EXTRA_BITS 2 |
| |
| /* |
| * Enforce 16 byte alignment for the data, which is supposed to be used |
| * with SIMD optimized code. |
| */ |
| #define SBC_ALIGN 16 |
| |
| /* This structure contains an unpacked SBC frame. |
| Yes, there is probably quite some unused space herein */ |
| struct sbc_frame { |
| uint8_t frequency; |
| uint8_t blocks; |
| enum { |
| MONO = SBC_MODE_MONO, |
| DUAL_CHANNEL = SBC_MODE_DUAL_CHANNEL, |
| STEREO = SBC_MODE_STEREO, |
| JOINT_STEREO = SBC_MODE_JOINT_STEREO |
| } mode; |
| uint8_t channels; |
| enum { |
| LOUDNESS = SBC_AM_LOUDNESS, |
| SNR = SBC_AM_SNR |
| } allocation; |
| uint8_t subbands; |
| uint8_t bitpool; |
| uint16_t codesize; |
| |
| /* bit number x set means joint stereo has been used in subband x */ |
| uint8_t joint; |
| |
| /* only the lower 4 bits of every element are to be used */ |
| DECLARE_ALIGNED(SBC_ALIGN, uint32_t, scale_factor)[2][8]; |
| |
| /* raw integer subband samples in the frame */ |
| DECLARE_ALIGNED(SBC_ALIGN, int32_t, sb_sample_f)[16][2][8]; |
| |
| /* modified subband samples */ |
| DECLARE_ALIGNED(SBC_ALIGN, int32_t, sb_sample)[16][2][8]; |
| |
| const AVCRC *crc_ctx; |
| }; |
| |
| uint8_t ff_sbc_crc8(const AVCRC *crc_ctx, const uint8_t *data, size_t len); |
| void ff_sbc_calculate_bits(const struct sbc_frame *frame, int (*bits)[8]); |
| |
| #endif /* AVCODEC_SBC_H */ |