code.delx.au - pulseaudio/blob - src/modules/bluetooth/sbc_primitives.h

   1 /*
   2  *
   3  *  Bluetooth low-complexity, subband codec (SBC) library
   4  *
   5  *  Copyright (C) 2004-2009  Marcel Holtmann <marcel@holtmann.org>
   6  *  Copyright (C) 2004-2005  Henryk Ploetz <henryk@ploetzli.ch>
   7  *  Copyright (C) 2005-2006  Brad Midgley <bmidgley@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