1 /* 2 * 3 * Bluetooth low-complexity, subband codec (SBC) library 4 * 5 * Copyright (C) 2004-2009 Marcel Holtmann <marcel (at) holtmann.org> 6 * Copyright (C) 2004-2005 Henryk Ploetz <henryk (at) ploetzli.ch> 7 * Copyright (C) 2005-2006 Brad Midgley <bmidgley (at) 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 /* Decodes ONE input block into ONE output block */ 89 ssize_t sbc_decode(sbc_t *sbc, const void *input, size_t input_len, 90 void *output, size_t output_len, size_t *written); 91 92 /* Encodes ONE input block into ONE output block */ 93 ssize_t sbc_encode(sbc_t *sbc, const void *input, size_t input_len, 94 void *output, size_t output_len, size_t *written); 95 96 /* Returns the output block size in bytes */ 97 size_t sbc_get_frame_length(sbc_t *sbc); 98 99 /* Returns the time one input/output block takes to play in msec*/ 100 unsigned sbc_get_frame_duration(sbc_t *sbc); 101 102 /* Returns the input block size in bytes */ 103 size_t sbc_get_codesize(sbc_t *sbc); 104 105 const char *sbc_get_implementation_info(sbc_t *sbc); 106 void sbc_finish(sbc_t *sbc); 107 108 #ifdef __cplusplus 109 } 110 #endif 111 112 #endif /* __SBC_H */ 113
