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comparison spandsp-0.0.6pre17/src/spandsp/private/g722.h @ 4:26cd8f1ef0b1
import spandsp-0.0.6pre17
author | Peter Meerwald <pmeerw@cosy.sbg.ac.at> |
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date | Fri, 25 Jun 2010 15:50:58 +0200 |
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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 * $Id: g722.h,v 1.2 2009/04/12 09:12:11 steveu Exp $ | |
32 */ | |
33 | |
34 | |
35 /*! \file */ | |
36 | |
37 #if !defined(_SPANDSP_PRIVATE_G722_H_) | |
38 #define _SPANDSP_PRIVATE_G722_H_ | |
39 | |
40 /*! The per band parameters for both encoding and decoding G.722 */ | |
41 typedef struct | |
42 { | |
43 int16_t nb; | |
44 int16_t det; | |
45 int16_t s; | |
46 int16_t sz; | |
47 int16_t r; | |
48 int16_t p[2]; | |
49 int16_t a[2]; | |
50 int16_t b[6]; | |
51 int16_t d[7]; | |
52 } g722_band_t; | |
53 | |
54 /*! | |
55 G.722 encode state | |
56 */ | |
57 struct g722_encode_state_s | |
58 { | |
59 /*! TRUE if the operating in the special ITU test mode, with the band split filters | |
60 disabled. */ | |
61 int itu_test_mode; | |
62 /*! TRUE if the G.722 data is packed */ | |
63 int packed; | |
64 /*! TRUE if encode from 8k samples/second */ | |
65 int eight_k; | |
66 /*! 6 for 48000kbps, 7 for 56000kbps, or 8 for 64000kbps. */ | |
67 int bits_per_sample; | |
68 | |
69 /*! Signal history for the QMF */ | |
70 int16_t x[12]; | |
71 int16_t y[12]; | |
72 int ptr; | |
73 | |
74 g722_band_t band[2]; | |
75 | |
76 uint32_t in_buffer; | |
77 int in_bits; | |
78 uint32_t out_buffer; | |
79 int out_bits; | |
80 }; | |
81 | |
82 /*! | |
83 G.722 decode state | |
84 */ | |
85 struct g722_decode_state_s | |
86 { | |
87 /*! TRUE if the operating in the special ITU test mode, with the band split filters | |
88 disabled. */ | |
89 int itu_test_mode; | |
90 /*! TRUE if the G.722 data is packed */ | |
91 int packed; | |
92 /*! TRUE if decode to 8k samples/second */ | |
93 int eight_k; | |
94 /*! 6 for 48000kbps, 7 for 56000kbps, or 8 for 64000kbps. */ | |
95 int bits_per_sample; | |
96 | |
97 /*! Signal history for the QMF */ | |
98 int16_t x[12]; | |
99 int16_t y[12]; | |
100 int ptr; | |
101 | |
102 g722_band_t band[2]; | |
103 | |
104 uint32_t in_buffer; | |
105 int in_bits; | |
106 uint32_t out_buffer; | |
107 int out_bits; | |
108 }; | |
109 | |
110 #endif | |
111 /*- End of file ------------------------------------------------------------*/ |