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

   1 /*
   2  *
   3  *  Bluetooth low-complexity, subband codec (SBC) library
   4  *
   5  *  Copyright (C) 2008-2010  Nokia Corporation
   6  *  Copyright (C) 2004-2010  Marcel Holtmann <marcel@holtmann.org>
   7  *  Copyright (C) 2004-2005  Henryk Ploetz <henryk@ploetzli.ch>
   8  *  Copyright (C) 2005-2006  Brad Midgley <bmidgley@xmission.com>
   9  *
  10  *
  11  *  This library is free software; you can redistribute it and/or
  12  *  modify it under the terms of the GNU Lesser General Public
  13  *  License as published by the Free Software Foundation; either
  14  *  version 2.1 of the License, or (at your option) any later version.
  15  *
  16  *  This library is distributed in the hope that it will be useful,
  17  *  but WITHOUT ANY WARRANTY; without even the implied warranty of
  18  *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  19  *  Lesser General Public License for more details.
  20  *
  21  *  You should have received a copy of the GNU Lesser General Public
  22  *  License along with this library; if not, write to the Free Software
  23  *  Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA  02110-1301  USA
  24  *
  25  */
  26
  27 #ifndef __SBC_H
  28 #define __SBC_H
  29
  30 #ifdef __cplusplus
  31 extern "C" {
  32 #endif
  33
  34 #include <stdint.h>
  35 #include <sys/types.h>
  36
  37 /* sampling frequency */
  38 #define SBC_FREQ_16000          0x00
  39 #define SBC_FREQ_32000          0x01
  40 #define SBC_FREQ_44100          0x02
  41 #define SBC_FREQ_48000          0x03
  42
  43 /* blocks */
  44 #define SBC_BLK_4               0x00
  45 #define SBC_BLK_8               0x01
  46 #define SBC_BLK_12              0x02
  47 #define SBC_BLK_16              0x03
  48
  49 /* channel mode */
  50 #define SBC_MODE_MONO           0x00
  51 #define SBC_MODE_DUAL_CHANNEL   0x01
  52 #define SBC_MODE_STEREO         0x02
  53 #define SBC_MODE_JOINT_STEREO   0x03
  54
  55 /* allocation method */
  56 #define SBC_AM_LOUDNESS         0x00
  57 #define SBC_AM_SNR              0x01
  58
  59 /* subbands */
  60 #define SBC_SB_4                0x00
  61 #define SBC_SB_8                0x01
  62
  63 /* Data endianess */
  64 #define SBC_LE                  0x00
  65 #define SBC_BE                  0x01
  66
  67 struct sbc_struct {
  68         unsigned long flags;
  69
  70         uint8_t frequency;
  71         uint8_t blocks;
  72         uint8_t subbands;
  73         uint8_t mode;
  74         uint8_t allocation;
  75         uint8_t bitpool;
  76         uint8_t endian;
  77
  78         void *priv;
  79         void *priv_alloc_base;
  80 };
  81
  82 typedef struct sbc_struct sbc_t;
  83
  84 int sbc_init(sbc_t *sbc, unsigned long flags);
  85 int sbc_reinit(sbc_t *sbc, unsigned long flags);
  86
  87 ssize_t sbc_parse(sbc_t *sbc, const void *input, size_t input_len);
  88
  89 /* Decodes ONE input block into ONE output block */
  90 ssize_t sbc_decode(sbc_t *sbc, const void *input, size_t input_len,
  91                         void *output, size_t output_len, size_t *written);
  92
  93 /* Encodes ONE input block into ONE output block */
  94 ssize_t sbc_encode(sbc_t *sbc, const void *input, size_t input_len,
  95                         void *output, size_t output_len, ssize_t *written);
  96
  97 /* Returns the output block size in bytes */
  98 size_t sbc_get_frame_length(sbc_t *sbc);
  99
 100 /* Returns the time one input/output block takes to play in msec*/
 101 unsigned sbc_get_frame_duration(sbc_t *sbc);
 102
 103 /* Returns the input block size in bytes */
 104 size_t sbc_get_codesize(sbc_t *sbc);
 105
 106 const char *sbc_get_implementation_info(sbc_t *sbc);
 107 void sbc_finish(sbc_t *sbc);
 108
 109 #ifdef __cplusplus
 110 }
 111 #endif
 112
 113 #endif /* __SBC_H */