blob: 8015bd052d482fbd7acb361dfc6cbce8eeae4cce (
about) (
plain) (
blame)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
|
#ifndef _ADPCMCODEC_H_
#define _ADPCMCODEC_H_
//=============================================================================
//
// File : DccVoiceAdpcmCodec.h
// Creation date : Wed Aug 22 19:12:46 2001 GMT by Szymon Stefanek
//
// This file is part of the KVIrc IRC client distribution
// Copyright (C) 2001-2010 Szymon Stefanek (pragma at kvirc dot net)
//
// This program is FREE software. You can redistribute it and/or
// modify it under the terms of the GNU General Public License
// as published by the Free Software Foundation; either version 2
// of the License, or (at your option) any later version.
//
// This program is distributed in the HOPE that it will be USEFUL,
// but WITHOUT ANY WARRANTY; without even the implied warranty of
// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.
// See the GNU General Public License for more details.
//
// You should have received a copy of the GNU General Public License
// along with this program. If not, write to the Free Software Foundation,
// Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
//
//=============================================================================
//
// adpcm.h - include file for adpcm coder.
//
// Version 1.0, 7-Jul-92.
//
//
// Average compression speed experiment: P166MMX 32MEG
//
// INPUT | OUTPUT | COMPRESSION TIME
// ------------------------------------------------------------------------
// shorts bytes | bytes | min msec. avrg. high peak (1 time)
// ------------------------------------------------------------------------
// 512 1024 | 256 | ~4 4 34
// 1024 2048 | 512 | ~7 8 75
// 2048 4096 | 1024 | ~13 15 175 (!!!)
// 4096 8192 | 2048 | ~26 33 91
// 8192 16384 | 4096 | ~57 80 220 (~1 sec of audio)
// 16384 32768 | 8192 | ~110 250 290
//
#include <QString> // fix for qtextstream.h
#include "DccVoiceCodec.h"
struct ADPCM_state
{
short valprev; /* Previous output value */
char index; /* HelpIndex into stepsize table */
};
class DccVoiceAdpcmCodec : public DccVoiceCodec
{
public:
DccVoiceAdpcmCodec();
virtual ~DccVoiceAdpcmCodec();
private:
ADPCM_state * m_pEncodeState;
ADPCM_state * m_pDecodeState;
public:
virtual void encode(KviDataBuffer * signal, KviDataBuffer * stream);
virtual void decode(KviDataBuffer * stream, KviDataBuffer * signal);
virtual int encodedFrameSize();
virtual int decodedFrameSize();
};
#endif //_ADPCMCODEC_H_
|
