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

   1 /*
   2  *
   3  *  Bluetooth low-complexity, subband codec (SBC) library
   4  *
   5  *  Copyright (C) 2004-2009  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_H
  27 #define __SBC_H
  28
  29 #ifdef __cplusplus
  30 extern "C" {
  31 #endif
  32
  33 #include <stdint.h>
  34 #include <sys/types.h>
  35
  36 /* sampling frequency */
  37 #define SBC_FREQ_16000          0x00
  38 #define SBC_FREQ_32000          0x01
  39 #define SBC_FREQ_44100          0x02
  40 #define SBC_FREQ_48000          0x03
  41
  42 /* blocks */
  43 #define SBC_BLK_4               0x00
  44 #define SBC_BLK_8               0x01
  45 #define SBC_BLK_12              0x02
  46 #define SBC_BLK_16              0x03
  47
  48 /* channel mode */
  49 #define SBC_MODE_MONO           0x00
  50 #define SBC_MODE_DUAL_CHANNEL   0x01
  51 #define SBC_MODE_STEREO         0x02
  52 #define SBC_MODE_JOINT_STEREO   0x03
  53
  54 /* allocation method */
  55 #define SBC_AM_LOUDNESS         0x00
  56 #define SBC_AM_SNR              0x01
  57
  58 /* subbands */
  59 #define SBC_SB_4                0x00
  60 #define SBC_SB_8                0x01
  61
  62 /* Data endianess */
  63 #define SBC_LE                  0x00
  64 #define SBC_BE                  0x01
  65
  66 struct sbc_struct {
  67         unsigned long flags;
  68
  69         uint8_t frequency;
  70         uint8_t blocks;
  71         uint8_t subbands;
  72         uint8_t mode;
  73         uint8_t allocation;
  74         uint8_t bitpool;
  75         uint8_t endian;
  76
  77         void *priv;
  78         void *priv_alloc_base;
  79 };
  80
  81 typedef struct sbc_struct sbc_t;
  82
  83 int sbc_init(sbc_t *sbc, unsigned long flags);
  84 int sbc_reinit(sbc_t *sbc, unsigned long flags);
  85
  86 ssize_t sbc_parse(sbc_t *sbc, const void *input, size_t input_len);
  87
  88 ssize_t sbc_decode(sbc_t *sbc, const void *input, size_t input_len,
  89                         void *output, size_t output_len, size_t *written);
  90
  91 /* Encodes ONE input block into ONE output block */
  92 ssize_t sbc_encode(sbc_t *sbc, const void *input, size_t input_len,
  93                         void *output, size_t output_len, size_t *written);
  94
  95 /* Returns the output block size in bytes */
  96 size_t sbc_get_frame_length(sbc_t *sbc);
  97
  98 /* Returns the time one input/output block takes to play in msec*/
  99 unsigned sbc_get_frame_duration(sbc_t *sbc);
 100
 101 /* Returns the input block size in bytes */
 102 size_t sbc_get_codesize(sbc_t *sbc);
 103
 104 const char *sbc_get_implementation_info(sbc_t *sbc);
 105 void sbc_finish(sbc_t *sbc);
 106
 107 #ifdef __cplusplus
 108 }
 109 #endif
 110
 111 #endif /* __SBC_H */