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
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
|
/* -*- c-basic-offset: 4 indent-tabs-mode: nil -*- vi:set ts=8 sts=4 sw=4: */
/*
Sonic Visualiser
An audio file viewer and annotation editor.
Centre for Digital Music, Queen Mary, University of London.
This file copyright 2017 Queen Mary, University of London.
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. See the file
COPYING included with this distribution for more information.
*/
#ifndef SV_CSV_STREAM_WRITER_H
#define SV_CSV_STREAM_WRITER_H
#include "base/BaseTypes.h"
#include "base/Selection.h"
#include "base/ProgressReporter.h"
#include "base/DataExportOptions.h"
#include "base/StringBits.h"
#include "data/model/Model.h"
#include <QString>
#include <algorithm>
#include <numeric>
namespace sv {
namespace CSVStreamWriter
{
template <class OutStream>
bool
writeInChunks(OutStream& oss,
const Model& model,
const MultiSelection& regions,
ProgressReporter* reporter = nullptr,
QString delimiter = ",",
DataExportOptions options = DataExportDefaults,
const sv_frame_t blockSize = 16384)
{
const auto selections = regions.getSelections();
if (blockSize <= 0 || selections.empty()) return false;
// TODO, some form of checking validity of selections?
const auto nFramesToWrite = std::accumulate(
selections.begin(),
selections.end(),
0,
[](sv_frame_t acc, const Selection& current) -> sv_frame_t {
return acc + (current.getEndFrame() - current.getStartFrame());
}
);
const auto wasCancelled = [&reporter]() {
return reporter && reporter->wasCancelled();
};
sv_frame_t nFramesWritten = 0;
int previousProgress = 0;
bool started = false;
for (const auto& extents : selections) {
const auto startFrame = extents.getStartFrame();
const auto endFrame = extents.getEndFrame();
auto readPtr = startFrame;
while (readPtr < endFrame) {
if (wasCancelled()) return false;
const auto start = readPtr;
const auto end = std::min(start + blockSize, endFrame);
const auto data = model.toStringExportRows(
options,
start,
end - start
);
if (!data.empty()) {
for (const auto &row: data) {
if (started) {
oss << "\n";
} else {
started = true;
}
oss << StringBits::joinDelimited(row, delimiter);
}
}
nFramesWritten += end - start;
const int currentProgress =
int(100 * nFramesWritten / nFramesToWrite);
const bool hasIncreased = currentProgress > previousProgress;
if (hasIncreased) {
if (reporter) reporter->setProgress(currentProgress);
previousProgress = currentProgress;
}
readPtr = end;
}
}
return !wasCancelled(); // setProgress could process event loop
}
template <class OutStream>
bool
writeInChunks(OutStream& oss,
const Model& model,
const Selection& extents,
ProgressReporter* reporter = nullptr,
QString delimiter = ",",
DataExportOptions options = DataExportDefaults,
const sv_frame_t blockSize = 16384)
{
const auto startFrame = extents.isEmpty() ?
model.getStartFrame() : extents.getStartFrame();
const auto endFrame = extents.isEmpty() ?
model.getEndFrame() : extents.getEndFrame();
const auto hasValidExtents = startFrame >= 0 && endFrame > startFrame;
if (!hasValidExtents) return false;
Selection all {
startFrame,
endFrame
};
MultiSelection regions;
regions.addSelection(all);
return writeInChunks(
oss,
model,
regions,
reporter,
delimiter,
options,
blockSize
);
}
template <class OutStream>
bool
writeInChunks(OutStream& oss,
const Model& model,
ProgressReporter* reporter = nullptr,
QString delimiter = ",",
DataExportOptions options = DataExportDefaults,
const sv_frame_t blockSize = 16384)
{
const Selection empty;
return writeInChunks(
oss,
model,
empty,
reporter,
delimiter,
options,
blockSize
);
}
} // namespace CSVStreamWriter
} // end namespace sv
#endif
|
