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
74
75
76
77
78
79
80
81
82
83
84
85
86
87
|
/*
Copyright (C) 2015 Carl Hetherington <cth@carlh.net>
This file is part of DCP-o-matic.
DCP-o-matic 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.
DCP-o-matic 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 DCP-o-matic. If not, see <http://www.gnu.org/licenses/>.
*/
#include "audio_delay.h"
#include "audio_buffers.h"
#include "dcpomatic_assert.h"
#include <iostream>
using std::cout;
using boost::shared_ptr;
AudioDelay::AudioDelay (int samples)
: _samples (samples)
{
}
shared_ptr<AudioBuffers>
AudioDelay::run (shared_ptr<const AudioBuffers> in)
{
/* You can't call this with varying channel counts */
DCPOMATIC_ASSERT (!_tail || in->channels() == _tail->channels());
shared_ptr<AudioBuffers> out (new AudioBuffers (in->channels(), in->frames()));
if (in->frames() > _samples) {
if (!_tail) {
/* No tail; use silence */
out->make_silent (0, _samples);
} else {
/* Copy tail */
out->copy_from (_tail.get(), _samples, 0, 0);
}
/* Copy in to out */
out->copy_from (in.get(), in->frames() - _samples, 0, _samples);
/* Keep tail */
if (!_tail) {
_tail.reset (new AudioBuffers (in->channels(), _samples));
}
_tail->copy_from (in.get(), _samples, in->frames() - _samples, 0);
} else {
/* First part of the tail into the output */
if (_tail) {
out->copy_from (_tail.get(), out->frames(), 0, 0);
} else {
out->make_silent ();
_tail.reset (new AudioBuffers (out->channels(), _samples));
_tail->make_silent ();
}
/* Shuffle the tail down */
_tail->move (_tail->frames() - out->frames(), out->frames(), 0);
/* Copy input into the tail */
_tail->copy_from (in.get(), in->frames(), 0, _tail->frames() - in->frames());
}
return out;
}
void
AudioDelay::flush ()
{
_tail.reset ();
}
|
