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Diffstat (limited to 'src/modules/bluetooth/sbc_primitives.h')
| -rw-r--r-- | src/modules/bluetooth/sbc_primitives.h | 74 |
1 files changed, 74 insertions, 0 deletions
diff --git a/src/modules/bluetooth/sbc_primitives.h b/src/modules/bluetooth/sbc_primitives.h new file mode 100644 index 00000000..2708c829 --- /dev/null +++ b/src/modules/bluetooth/sbc_primitives.h @@ -0,0 +1,74 @@ +/* + * + * Bluetooth low-complexity, subband codec (SBC) library + * + * Copyright (C) 2004-2009 Marcel Holtmann <marcel@holtmann.org> + * Copyright (C) 2004-2005 Henryk Ploetz <henryk@ploetzli.ch> + * Copyright (C) 2005-2006 Brad Midgley <bmidgley@xmission.com> + * + * + * This library 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. + * + * This library 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 this library; if not, write to the Free Software + * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA + * + */ + +#ifndef __SBC_PRIMITIVES_H +#define __SBC_PRIMITIVES_H + +#define SCALE_OUT_BITS 15 +#define SBC_X_BUFFER_SIZE 328 + +#ifdef __GNUC__ +#define SBC_ALWAYS_INLINE __attribute__((always_inline)) +#else +#define SBC_ALWAYS_INLINE inline +#endif + +struct sbc_encoder_state { + int position; + int16_t SBC_ALIGNED X[2][SBC_X_BUFFER_SIZE]; + /* Polyphase analysis filter for 4 subbands configuration, + * it handles 4 blocks at once */ + void (*sbc_analyze_4b_4s)(int16_t *x, int32_t *out, int out_stride); + /* Polyphase analysis filter for 8 subbands configuration, + * it handles 4 blocks at once */ + void (*sbc_analyze_4b_8s)(int16_t *x, int32_t *out, int out_stride); + /* Process input data (deinterleave, endian conversion, reordering), + * depending on the number of subbands and input data byte order */ + int (*sbc_enc_process_input_4s_le)(int position, + const uint8_t *pcm, int16_t X[2][SBC_X_BUFFER_SIZE], + int nsamples, int nchannels); + int (*sbc_enc_process_input_4s_be)(int position, + const uint8_t *pcm, int16_t X[2][SBC_X_BUFFER_SIZE], + int nsamples, int nchannels); + int (*sbc_enc_process_input_8s_le)(int position, + const uint8_t *pcm, int16_t X[2][SBC_X_BUFFER_SIZE], + int nsamples, int nchannels); + int (*sbc_enc_process_input_8s_be)(int position, + const uint8_t *pcm, int16_t X[2][SBC_X_BUFFER_SIZE], + int nsamples, int nchannels); + /* Scale factors calculation */ + void (*sbc_calc_scalefactors)(int32_t sb_sample_f[16][2][8], + uint32_t scale_factor[2][8], + int blocks, int channels, int subbands); +}; + +/* + * Initialize pointers to the functions which are the basic "building bricks" + * of SBC codec. Best implementation is selected based on target CPU + * capabilities. + */ +void sbc_init_primitives(struct sbc_encoder_state *encoder_state); + +#endif |