FFmpeg
libavcodec
adx.h
Go to the documentation of this file.
1
/*
2
* ADX ADPCM codecs
3
* Copyright (c) 2001,2003 BERO
4
*
5
* This file is part of FFmpeg.
6
*
7
* FFmpeg is free software; you can redistribute it and/or
8
* modify it under the terms of the GNU Lesser General Public
9
* License as published by the Free Software Foundation; either
10
* version 2.1 of the License, or (at your option) any later version.
11
*
12
* FFmpeg is distributed in the hope that it will be useful,
13
* but WITHOUT ANY WARRANTY; without even the implied warranty of
14
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
15
* Lesser General Public License for more details.
16
*
17
* You should have received a copy of the GNU Lesser General Public
18
* License along with FFmpeg; if not, write to the Free Software
19
* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
20
*/
21
22
/**
23
* @file
24
* SEGA CRI adx codecs.
25
*
26
* Reference documents:
27
* http://ku-www.ss.titech.ac.jp/~yatsushi/adx.html
28
* adx2wav & wav2adx http://www.geocities.co.jp/Playtown/2004/
29
*/
30
31
#ifndef AVCODEC_ADX_H
32
#define AVCODEC_ADX_H
33
34
typedef
struct
ADXChannelState
{
35
int
s1
,
s2
;
36
}
ADXChannelState
;
37
38
#define MAX_CHANNELS 6
39
40
typedef
struct
ADXContext
{
41
int
channels
;
42
ADXChannelState
prev
[
MAX_CHANNELS
];
43
int
header_parsed
;
44
int
eof
;
45
int
cutoff
;
46
int
coeff
[2];
47
}
ADXContext
;
48
49
#define COEFF_BITS 12
50
51
#define BLOCK_SIZE 18
52
#define BLOCK_SAMPLES 32
53
54
/**
55
* Calculate LPC coefficients based on cutoff frequency and sample rate.
56
*
57
* @param cutoff cutoff frequency
58
* @param sample_rate sample rate
59
* @param bits number of bits used to quantize coefficients
60
* @param[out] coeff 2 quantized LPC coefficients
61
*/
62
void
ff_adx_calculate_coeffs
(
int
cutoff,
int
sample_rate,
int
bits
,
int
*
coeff
);
63
64
#endif
/* AVCODEC_ADX_H */
ADXContext::header_parsed
int header_parsed
Definition:
adx.h:43
ADXChannelState::s2
int s2
Definition:
adx.h:35
MAX_CHANNELS
#define MAX_CHANNELS
Definition:
adx.h:38
ADXChannelState::s1
int s1
Definition:
adx.h:35
ADXContext::eof
int eof
Definition:
adx.h:44
ADXContext::cutoff
int cutoff
Definition:
adx.h:45
bits
uint8_t bits
Definition:
vp3data.h:128
ADXContext::channels
int channels
Definition:
adx.h:41
ADXChannelState
Definition:
adx.h:34
ADXContext::coeff
int coeff[2]
Definition:
adx.h:46
ff_adx_calculate_coeffs
void ff_adx_calculate_coeffs(int cutoff, int sample_rate, int bits, int *coeff)
Calculate LPC coefficients based on cutoff frequency and sample rate.
Definition:
adx.c:25
ADXContext
Definition:
adx.h:40
ADXContext::prev
ADXChannelState prev[MAX_CHANNELS]
Definition:
adx.h:42
coeff
static const double coeff[2][5]
Definition:
vf_owdenoise.c:80
Generated on Wed Dec 11 2024 19:21:23 for FFmpeg by
1.8.17