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

   1 /*
   2  *
   3  *  Bluetooth low-complexity, subband codec (SBC) library
   4  *
   5  *  Copyright (C) 2004-2008  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_H
  27 #define __SBC_H
  28
  29 #ifdef __cplusplus
  30 extern "C" {
  31 #endif
  32
  33 #include <stdint.h>
  34
  35 /* sampling frequency */
  36 #define SBC_FREQ_16000          0x00
  37 #define SBC_FREQ_32000          0x01
  38 #define SBC_FREQ_44100          0x02
  39 #define SBC_FREQ_48000          0x03
  40
  41 /* blocks */
  42 #define SBC_BLK_4               0x00
  43 #define SBC_BLK_8               0x01
  44 #define SBC_BLK_12              0x02
  45 #define SBC_BLK_16              0x03
  46
  47 /* channel mode */
  48 #define SBC_MODE_MONO           0x00
  49 #define SBC_MODE_DUAL_CHANNEL   0x01
  50 #define SBC_MODE_STEREO         0x02
  51 #define SBC_MODE_JOINT_STEREO   0x03
  52
  53 /* allocation method */
  54 #define SBC_AM_LOUDNESS         0x00
  55 #define SBC_AM_SNR              0x01
  56
  57 /* subbands */
  58 #define SBC_SB_4                0x00
  59 #define SBC_SB_8                0x01
  60
  61 /* Data endianess */
  62 #define SBC_LE                  0x00
  63 #define SBC_BE                  0x01
  64
  65 struct sbc_struct {
  66         unsigned long flags;
  67
  68         uint8_t frequency;
  69         uint8_t blocks;
  70         uint8_t subbands;
  71         uint8_t mode;
  72         uint8_t allocation;
  73         uint8_t bitpool;
  74         uint8_t endian;
  75
  76         void *priv;
  77 };
  78
  79 typedef struct sbc_struct sbc_t;
  80
  81 int sbc_init(sbc_t *sbc, unsigned long flags);
  82 int sbc_reinit(sbc_t *sbc, unsigned long flags);
  83 int sbc_parse(sbc_t *sbc, void *input, int input_len);
  84 int sbc_decode(sbc_t *sbc, void *input, int input_len, void *output,
  85                 int output_len, int *len);
  86 int sbc_encode(sbc_t *sbc, void *input, int input_len, void *output,
  87                 int output_len, int *written);
  88 int sbc_get_frame_length(sbc_t *sbc);
  89 int sbc_get_frame_duration(sbc_t *sbc);
  90 int sbc_get_codesize(sbc_t *sbc);
  91 void sbc_finish(sbc_t *sbc);
  92
  93 #ifdef __cplusplus
  94 }
  95 #endif
  96
  97 #endif /* __SBC_H */