1 /* 2 * 3 * Bluetooth low-complexity, subband codec (SBC) library 4 * 5 * Copyright (C) 2008-2010 Nokia Corporation 6 * Copyright (C) 2004-2010 Marcel Holtmann <marcel@holtmann.org> 7 * Copyright (C) 2004-2005 Henryk Ploetz <henryk@ploetzli.ch> 8 * Copyright (C) 2005-2006 Brad Midgley <bmidgley@xmission.com> 9 * 10 * 11 * This library is free software; you can redistribute it and/or 12 * modify it under the terms of the GNU Lesser General Public 13 * License as published by the Free Software Foundation; either 14 * version 2.1 of the License, or (at your option) any later version. 15 * 16 * This library is distributed in the hope that it will be useful, 17 * but WITHOUT ANY WARRANTY; without even the implied warranty of 18 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU 19 * Lesser General Public License for more details. 20 * 21 * You should have received a copy of the GNU Lesser General Public 22 * License along with this library; if not, write to the Free Software 23 * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA 24 * 25 */ 26 27 #ifndef __SBC_PRIMITIVES_H 28 #define __SBC_PRIMITIVES_H 29 30 #define SCALE_OUT_BITS 15 31 #define SBC_X_BUFFER_SIZE 328 32 33 #ifdef __GNUC__ 34 #define SBC_ALWAYS_INLINE __attribute__((always_inline)) 35 #else 36 #define SBC_ALWAYS_INLINE inline 37 #endif 38 39 struct sbc_encoder_state { 40 int position; 41 int16_t SBC_ALIGNED X[2][SBC_X_BUFFER_SIZE]; 42 /* Polyphase analysis filter for 4 subbands configuration, 43 * it handles 4 blocks at once */ 44 void (*sbc_analyze_4b_4s)(int16_t *x, int32_t *out, int out_stride); 45 /* Polyphase analysis filter for 8 subbands configuration, 46 * it handles 4 blocks at once */ 47 void (*sbc_analyze_4b_8s)(int16_t *x, int32_t *out, int out_stride); 48 /* Process input data (deinterleave, endian conversion, reordering), 49 * depending on the number of subbands and input data byte order */ 50 int (*sbc_enc_process_input_4s_le)(int position, 51 const uint8_t *pcm, int16_t X[2][SBC_X_BUFFER_SIZE], 52 int nsamples, int nchannels); 53 int (*sbc_enc_process_input_4s_be)(int position, 54 const uint8_t *pcm, int16_t X[2][SBC_X_BUFFER_SIZE], 55 int nsamples, int nchannels); 56 int (*sbc_enc_process_input_8s_le)(int position, 57 const uint8_t *pcm, int16_t X[2][SBC_X_BUFFER_SIZE], 58 int nsamples, int nchannels); 59 int (*sbc_enc_process_input_8s_be)(int position, 60 const uint8_t *pcm, int16_t X[2][SBC_X_BUFFER_SIZE], 61 int nsamples, int nchannels); 62 /* Scale factors calculation */ 63 void (*sbc_calc_scalefactors)(int32_t sb_sample_f[16][2][8], 64 uint32_t scale_factor[2][8], 65 int blocks, int channels, int subbands); 66 /* Scale factors calculation with joint stereo support */ 67 int (*sbc_calc_scalefactors_j)(int32_t sb_sample_f[16][2][8], 68 uint32_t scale_factor[2][8], 69 int blocks, int subbands); 70 const char *implementation_info; 71 }; 72 73 /* 74 * Initialize pointers to the functions which are the basic "building bricks" 75 * of SBC codec. Best implementation is selected based on target CPU 76 * capabilities. 77 */ 78 void sbc_init_primitives(struct sbc_encoder_state *encoder_state); 79 80 #endif 81