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76 lines
2.8 KiB
C
76 lines
2.8 KiB
C
/*
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*
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* Bluetooth low-complexity, subband codec (SBC) library
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*
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* Copyright (C) 2004-2009 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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*
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* This library 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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* This library 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 this library; if not, write to the Free Software
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* Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
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*
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*/
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#ifndef __SBC_PRIMITIVES_H
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#define __SBC_PRIMITIVES_H
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#define SCALE_OUT_BITS 15
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#define SBC_X_BUFFER_SIZE 328
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#ifdef __GNUC__
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#define SBC_ALWAYS_INLINE __attribute__((always_inline))
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#else
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#define SBC_ALWAYS_INLINE inline
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#endif
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struct sbc_encoder_state {
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int position;
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int16_t SBC_ALIGNED X[2][SBC_X_BUFFER_SIZE];
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/* Polyphase analysis filter for 4 subbands configuration,
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* it handles 4 blocks at once */
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void (*sbc_analyze_4b_4s)(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 4 blocks at once */
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void (*sbc_analyze_4b_8s)(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_le)(int position,
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const uint8_t *pcm, 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_4s_be)(int position,
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const uint8_t *pcm, 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_le)(int position,
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const uint8_t *pcm, 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_be)(int position,
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const uint8_t *pcm, 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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const char *implementation_info;
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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 sbc_init_primitives(struct sbc_encoder_state *encoder_state);
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#endif
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