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
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
|
/*
Copyright (C) 2016-2018 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_ring_buffers.h"
#include "dcpomatic_assert.h"
#include "exceptions.h"
#include <boost/foreach.hpp>
#include <iostream>
using std::min;
using std::cout;
using std::make_pair;
using std::pair;
using std::list;
using boost::shared_ptr;
using boost::optional;
AudioRingBuffers::AudioRingBuffers ()
: _used_in_head (0)
{
}
void
AudioRingBuffers::put (shared_ptr<const AudioBuffers> data, DCPTime time)
{
boost::mutex::scoped_lock lm (_mutex);
if (!_buffers.empty()) {
DCPOMATIC_ASSERT (_buffers.front().first->channels() == data->channels());
if ((_buffers.back().second + DCPTime::from_frames(_buffers.back().first->frames(), 48000)) != time) {
cout << "bad put " << to_string(_buffers.back().second) << " " << _buffers.back().first->frames() << " " << to_string(time) << "\n";
}
DCPOMATIC_ASSERT ((_buffers.back().second + DCPTime::from_frames(_buffers.back().first->frames(), 48000)) == time);
}
_buffers.push_back(make_pair(data, time));
}
/** @return time of the returned data; if it's not set this indicates an underrun */
optional<DCPTime>
AudioRingBuffers::get (float* out, int channels, int frames)
{
boost::mutex::scoped_lock lm (_mutex);
optional<DCPTime> time;
while (frames > 0) {
if (_buffers.empty ()) {
for (int i = 0; i < frames; ++i) {
for (int j = 0; j < channels; ++j) {
*out++ = 0;
}
}
cout << "audio underrun; missing " << frames << "!\n";
return time;
}
pair<shared_ptr<const AudioBuffers>, DCPTime> front = _buffers.front ();
if (!time) {
time = front.second + DCPTime::from_frames(_used_in_head, 48000);
}
int const to_do = min (frames, front.first->frames() - _used_in_head);
float** p = front.first->data();
int const c = min (front.first->channels(), channels);
for (int i = 0; i < to_do; ++i) {
for (int j = 0; j < c; ++j) {
*out++ = p[j][i + _used_in_head];
}
for (int j = c; j < channels; ++j) {
*out++ = 0;
}
}
_used_in_head += to_do;
frames -= to_do;
if (_used_in_head == front.first->frames()) {
_buffers.pop_front ();
_used_in_head = 0;
}
}
return time;
}
void
AudioRingBuffers::clear ()
{
boost::mutex::scoped_lock lm (_mutex);
_buffers.clear ();
_used_in_head = 0;
}
Frame
AudioRingBuffers::size () const
{
boost::mutex::scoped_lock lm (_mutex);
Frame s = 0;
for (list<pair<shared_ptr<const AudioBuffers>, DCPTime> >::const_iterator i = _buffers.begin(); i != _buffers.end(); ++i) {
s += i->first->frames();
}
return s - _used_in_head;
}
|
