1 /* 2 * g722.h - The ITU G.722 codec. 3 * 4 * Written by Steve Underwood <steveu@coppice.org> 5 * 6 * Copyright (C) 2005 Steve Underwood 7 * 8 * Despite my general liking of the GPL, I place my own contributions 9 * to this code in the public domain for the benefit of all mankind - 10 * even the slimy ones who might try to proprietize my work and use it 11 * to my detriment. 12 * 13 * Based on a single channel G.722 codec which is: 14 * 15 ***** Copyright (c) CMU 1993 ***** 16 * Computer Science, Speech Group 17 * Chengxiang Lu and Alex Hauptmann 18 * 19 * $Id: g722_private.h,v 1.1 2012/08/07 11:33:45 sobomax Exp $ 20 */ 21 22 23 /*! \file */ 24 25 #if !defined(_G722_PRIVATE_H_) 26 #define _G722_PRIVATE_H_ 27 28 /*! \page g722_page G.722 encoding and decoding 29 \section g722_page_sec_1 What does it do? 30 The G.722 module is a bit exact implementation of the ITU G.722 specification for all three 31 specified bit rates - 64000bps, 56000bps and 48000bps. It passes the ITU tests. 32 33 To allow fast and flexible interworking with narrow band telephony, the encoder and decoder 34 support an option for the linear audio to be an 8k samples/second stream. In this mode the 35 codec is considerably faster, and still fully compatible with wideband terminals using G.722. 36 37 \section g722_page_sec_2 How does it work? 38 ???. 39 */ 40 41 typedef struct g722_encode_state G722_ENC_CTX; 42 #define _G722_ENC_CTX_DEFINED 43 typedef struct g722_decode_state G722_DEC_CTX; 44 #define _G722_DEC_CTX_DEFINED 45 46 struct g722_encode_state 47 { 48 /*! TRUE if the operating in the special ITU test mode, with the band split filters 49 disabled. */ 50 int itu_test_mode; 51 /*! TRUE if the G.722 data is packed */ 52 int packed; 53 /*! TRUE if encode from 8k samples/second */ 54 int eight_k; 55 /*! 6 for 48000kbps, 7 for 56000kbps, or 8 for 64000kbps. */ 56 int bits_per_sample; 57 58 /*! Signal history for the QMF */ 59 int x[24]; 60 61 struct 62 { 63 int s; 64 int sp; 65 int sz; 66 int r[3]; 67 int a[3]; 68 int ap[3]; 69 int p[3]; 70 int d[7]; 71 int b[7]; 72 int bp[7]; 73 int sg[7]; 74 int nb; 75 int det; 76 } band[2]; 77 78 unsigned int in_buffer; 79 int in_bits; 80 unsigned int out_buffer; 81 int out_bits; 82 }; 83 84 struct g722_decode_state 85 { 86 /*! TRUE if the operating in the special ITU test mode, with the band split filters 87 disabled. */ 88 int itu_test_mode; 89 /*! TRUE if the G.722 data is packed */ 90 int packed; 91 /*! TRUE if decode to 8k samples/second */ 92 int eight_k; 93 /*! 6 for 48000kbps, 7 for 56000kbps, or 8 for 64000kbps. */ 94 int bits_per_sample; 95 96 /*! Signal history for the QMF */ 97 int x[24]; 98 99 struct 100 { 101 int s; 102 int sp; 103 int sz; 104 int r[3]; 105 int a[3]; 106 int ap[3]; 107 int p[3]; 108 int d[7]; 109 int b[7]; 110 int bp[7]; 111 int sg[7]; 112 int nb; 113 int det; 114 } band[2]; 115 116 unsigned int in_buffer; 117 int in_bits; 118 unsigned int out_buffer; 119 int out_bits; 120 }; 121 122 #endif 123