spandsp: g722.h Source File

spandsp 0.0.6

private/g722.h
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1/*
2 * SpanDSP - a series of DSP components for telephony
3 *
4 * private/g722.h - The ITU G.722 codec.
5 *
6 * Written by Steve Underwood <steveu@coppice.org>
7 *
8 * Copyright (C) 2005 Steve Underwood
9 *
10 * All rights reserved.
11 *
12 * This program is free software; you can redistribute it and/or modify
13 * it under the terms of the GNU Lesser General Public License version 2.1,
14 * as published by the Free Software Foundation.
15 *
16 * This program 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
19 * GNU 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 program; if not, write to the Free Software
23 * Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
24 *
25 * Based on a single channel G.722 codec which is:
26 *
27 ***** Copyright (c) CMU 1993 *****
28 * Computer Science, Speech Group
29 * Chengxiang Lu and Alex Hauptmann
30 */
31
32
33/*! \file */
34
35#if !defined(_SPANDSP_PRIVATE_G722_H_)
36#define _SPANDSP_PRIVATE_G722_H_
37
38/*! The per band parameters for both encoding and decoding G.722 */
39 typedef struct
40{
41 int16_t nb;
42 int16_t det;
43 int16_t s;
44 int16_t sz;
45 int16_t r;
46 int16_t p[2];
47 int16_t a[2];
48 int16_t b[6];
49 int16_t d[7];
50} g722_band_t;
51
52/*!
53 G.722 encode state
54 */
55 struct g722_encode_state_s
56{
57 /*! TRUE if the operating in the special ITU test mode, with the band split filters
58 disabled. */
59 int itu_test_mode;
60 /*! TRUE if the G.722 data is packed */
61 int packed;
62 /*! TRUE if encode from 8k samples/second */
63 int eight_k;
64 /*! 6 for 48000kbps, 7 for 56000kbps, or 8 for 64000kbps. */
65 int bits_per_sample;
66
67 /*! Signal history for the QMF */
68 int16_t x[12];
69 int16_t y[12];
70 int ptr;
71
72 g722_band_t band[2];
73
74 uint32_t in_buffer;
75 int in_bits;
76 uint32_t out_buffer;
77 int out_bits;
78};
79
80/*!
81 G.722 decode state
82 */
83 struct g722_decode_state_s
84{
85 /*! TRUE if the operating in the special ITU test mode, with the band split filters
86 disabled. */
87 int itu_test_mode;
88 /*! TRUE if the G.722 data is packed */
89 int packed;
90 /*! TRUE if decode to 8k samples/second */
91 int eight_k;
92 /*! 6 for 48000kbps, 7 for 56000kbps, or 8 for 64000kbps. */
93 int bits_per_sample;
94
95 /*! Signal history for the QMF */
96 int16_t x[12];
97 int16_t y[12];
98 int ptr;
99
100 g722_band_t band[2];
101
102 uint32_t in_buffer;
103 int in_bits;
104 uint32_t out_buffer;
105 int out_bits;
106};
107
108#endif
109/*- End of file ------------------------------------------------------------*/
g722_band_t
Definition private/g722.h:40
g722_decode_state_s
Definition private/g722.h:84
g722_decode_state_s::x
int16_t x[12]
Definition private/g722.h:96
g722_decode_state_s::packed
int packed
Definition private/g722.h:89
g722_decode_state_s::eight_k
int eight_k
Definition private/g722.h:91
g722_decode_state_s::itu_test_mode
int itu_test_mode
Definition private/g722.h:87
g722_decode_state_s::bits_per_sample
int bits_per_sample
Definition private/g722.h:93
g722_encode_state_s
Definition private/g722.h:56
g722_encode_state_s::bits_per_sample
int bits_per_sample
Definition private/g722.h:65
g722_encode_state_s::eight_k
int eight_k
Definition private/g722.h:63
g722_encode_state_s::x
int16_t x[12]
Definition private/g722.h:68
g722_encode_state_s::packed
int packed
Definition private/g722.h:61
g722_encode_state_s::itu_test_mode
int itu_test_mode
Definition private/g722.h:59