1 /* 2 * 3 * Bluetooth low-complexity, subband codec (SBC) library 4 * 5 * Copyright (C) 2004-2009 Marcel Holtmann <marcel (at) holtmann.org> 6 * Copyright (C) 2004-2005 Henryk Ploetz <henryk (at) ploetzli.ch> 7 * Copyright (C) 2005-2006 Brad Midgley <bmidgley (at) xmission.com> 8 * 9 * 10 * This library is free software; you can redistribute it and/or 11 * modify it under the terms of the GNU Lesser General Public 12 * License as published by the Free Software Foundation; either 13 * version 2.1 of the License, or (at your option) any later version. 14 * 15 * This library is distributed in the hope that it will be useful, 16 * but WITHOUT ANY WARRANTY; without even the implied warranty of 17 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU 18 * Lesser General Public License for more details. 19 * 20 * You should have received a copy of the GNU Lesser General Public 21 * License along with this library; if not, write to the Free Software 22 * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA 23 * 24 */ 25 26 #ifndef __SBC_PRIMITIVES_H 27 #define __SBC_PRIMITIVES_H 28 29 #define SCALE_OUT_BITS 15 30 #define SBC_X_BUFFER_SIZE 328 31 32 #ifdef __GNUC__ 33 #define SBC_ALWAYS_INLINE __attribute__((always_inline)) 34 #else 35 #define SBC_ALWAYS_INLINE inline 36 #endif 37 38 struct sbc_encoder_state { 39 int position; 40 int16_t SBC_ALIGNED X[2][SBC_X_BUFFER_SIZE]; 41 /* Polyphase analysis filter for 4 subbands configuration, 42 * it handles 4 blocks at once */ 43 void (*sbc_analyze_4b_4s)(int16_t *x, int32_t *out, int out_stride); 44 /* Polyphase analysis filter for 8 subbands configuration, 45 * it handles 4 blocks at once */ 46 void (*sbc_analyze_4b_8s)(int16_t *x, int32_t *out, int out_stride); 47 /* Process input data (deinterleave, endian conversion, reordering), 48 * depending on the number of subbands and input data byte order */ 49 int (*sbc_enc_process_input_4s_le)(int position, 50 const uint8_t *pcm, int16_t X[2][SBC_X_BUFFER_SIZE], 51 int nsamples, int nchannels); 52 int (*sbc_enc_process_input_4s_be)(int position, 53 const uint8_t *pcm, int16_t X[2][SBC_X_BUFFER_SIZE], 54 int nsamples, int nchannels); 55 int (*sbc_enc_process_input_8s_le)(int position, 56 const uint8_t *pcm, int16_t X[2][SBC_X_BUFFER_SIZE], 57 int nsamples, int nchannels); 58 int (*sbc_enc_process_input_8s_be)(int position, 59 const uint8_t *pcm, int16_t X[2][SBC_X_BUFFER_SIZE], 60 int nsamples, int nchannels); 61 /* Scale factors calculation */ 62 void (*sbc_calc_scalefactors)(int32_t sb_sample_f[16][2][8], 63 uint32_t scale_factor[2][8], 64 int blocks, int channels, int subbands); 65 const char *implementation_info; 66 }; 67 68 /* 69 * Initialize pointers to the functions which are the basic "building bricks" 70 * of SBC codec. Best implementation is selected based on target CPU 71 * capabilities. 72 */ 73 void sbc_init_primitives(struct sbc_encoder_state *encoder_state); 74 75 #endif 76
