1 /* 2 * SpanDSP - a series of DSP components for telephony 3 * 4 * g722.h - The ITU G.722 codec. 5 * 6 * Written by Steve Underwood <steveu (at) coppice.org> 7 * 8 * Copyright (C) 2005 Steve Underwood 9 * 10 * Despite my general liking of the GPL, I place my own contributions 11 * to this code in the public domain for the benefit of all mankind - 12 * even the slimy ones who might try to proprietize my work and use it 13 * to my detriment. 14 * 15 * Based on a single channel G.722 codec which is: 16 * 17 ***** Copyright (c) CMU 1993 ***** 18 * Computer Science, Speech Group 19 * Chengxiang Lu and Alex Hauptmann 20 * 21 * $Id: g722.h,v 1.10 2006/06/16 12:45:53 steveu Exp $ 22 * 23 * Modifications for WebRtc, 2011/04/28, by tlegrand: 24 * -Changed to use WebRtc types 25 * -Added new defines for minimum and maximum values of short int 26 */ 27 28 29 /*! \file */ 30 31 #if !defined(_G722_ENC_DEC_H_) 32 #define _G722_ENC_DEC_H_ 33 34 #include "webrtc/typedefs.h" 35 36 /*! \page g722_page G.722 encoding and decoding 37 \section g722_page_sec_1 What does it do? 38 The G.722 module is a bit exact implementation of the ITU G.722 specification for all three 39 specified bit rates - 64000bps, 56000bps and 48000bps. It passes the ITU tests. 40 41 To allow fast and flexible interworking with narrow band telephony, the encoder and decoder 42 support an option for the linear audio to be an 8k samples/second stream. In this mode the 43 codec is considerably faster, and still fully compatible with wideband terminals using G.722. 44 45 \section g722_page_sec_2 How does it work? 46 ???. 47 */ 48 49 #define WEBRTC_INT16_MAX 32767 50 #define WEBRTC_INT16_MIN -32768 51 52 enum 53 { 54 G722_SAMPLE_RATE_8000 = 0x0001, 55 G722_PACKED = 0x0002 56 }; 57 58 typedef struct 59 { 60 /*! TRUE if the operating in the special ITU test mode, with the band split filters 61 disabled. */ 62 int itu_test_mode; 63 /*! TRUE if the G.722 data is packed */ 64 int packed; 65 /*! TRUE if encode from 8k samples/second */ 66 int eight_k; 67 /*! 6 for 48000kbps, 7 for 56000kbps, or 8 for 64000kbps. */ 68 int bits_per_sample; 69 70 /*! Signal history for the QMF */ 71 int x[24]; 72 73 struct 74 { 75 int s; 76 int sp; 77 int sz; 78 int r[3]; 79 int a[3]; 80 int ap[3]; 81 int p[3]; 82 int d[7]; 83 int b[7]; 84 int bp[7]; 85 int sg[7]; 86 int nb; 87 int det; 88 } band[2]; 89 90 unsigned int in_buffer; 91 int in_bits; 92 unsigned int out_buffer; 93 int out_bits; 94 } G722EncoderState; 95 96 typedef struct 97 { 98 /*! TRUE if the operating in the special ITU test mode, with the band split filters 99 disabled. */ 100 int itu_test_mode; 101 /*! TRUE if the G.722 data is packed */ 102 int packed; 103 /*! TRUE if decode to 8k samples/second */ 104 int eight_k; 105 /*! 6 for 48000kbps, 7 for 56000kbps, or 8 for 64000kbps. */ 106 int bits_per_sample; 107 108 /*! Signal history for the QMF */ 109 int x[24]; 110 111 struct 112 { 113 int s; 114 int sp; 115 int sz; 116 int r[3]; 117 int a[3]; 118 int ap[3]; 119 int p[3]; 120 int d[7]; 121 int b[7]; 122 int bp[7]; 123 int sg[7]; 124 int nb; 125 int det; 126 } band[2]; 127 128 unsigned int in_buffer; 129 int in_bits; 130 unsigned int out_buffer; 131 int out_bits; 132 } G722DecoderState; 133 134 #ifdef __cplusplus 135 extern "C" { 136 #endif 137 138 G722EncoderState* WebRtc_g722_encode_init(G722EncoderState* s, 139 int rate, 140 int options); 141 int WebRtc_g722_encode_release(G722EncoderState *s); 142 size_t WebRtc_g722_encode(G722EncoderState *s, 143 uint8_t g722_data[], 144 const int16_t amp[], 145 size_t len); 146 147 G722DecoderState* WebRtc_g722_decode_init(G722DecoderState* s, 148 int rate, 149 int options); 150 int WebRtc_g722_decode_release(G722DecoderState *s); 151 size_t WebRtc_g722_decode(G722DecoderState *s, 152 int16_t amp[], 153 const uint8_t g722_data[], 154 size_t len); 155 156 #ifdef __cplusplus 157 } 158 #endif 159 160 #endif 161
