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 (at) holtmann.org> 7 * Copyright (C) 2004-2005 Henryk Ploetz <henryk (at) ploetzli.ch> 8 * Copyright (C) 2005-2006 Brad Midgley <bmidgley (at) 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 */ 114
