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
|
/*
* Copyright (C) 2007-2017 Paul Davis <paul@linuxaudiosystems.com>
* Copyright (C) 2008-2011 David Robillard <d@drobilla.net>
* Copyright (C) 2009-2010 Carl Hetherington <carl@carlh.net>
* Copyright (C) 2013 John Emmas <john@creativepost.co.uk>
* Copyright (C) 2016-2018 Robin Gareus <robin@gareus.org>
*
* 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.
*/
#ifndef __ardour_silentfilesource_h__
#define __ardour_silentfilesource_h__
#include <cstring>
#include "ardour/audiofilesource.h"
namespace ARDOUR {
class LIBARDOUR_API SilentFileSource : public AudioFileSource {
public:
int update_header (samplepos_t /*when*/, struct tm&, time_t) { return 0; }
int flush_header () { return 0; }
float sample_rate () const { return _sample_rate; }
void set_length (samplecnt_t len) { _length = len; }
void flush () {}
bool can_be_analysed() const { return false; }
bool clamped_at_unity() const { return false; }
protected:
void close() {}
friend class SourceFactory;
SilentFileSource (Session& s, const XMLNode& x, samplecnt_t len, float srate)
: Source (s, x)
, AudioFileSource (s, x, false)
, _sample_rate(srate)
{
_length = len;
}
samplecnt_t read_unlocked (Sample *dst, samplepos_t start, samplecnt_t cnt) const {
cnt = std::min (cnt, _length - start);
memset (dst, 0, sizeof (Sample) * cnt);
return cnt;
}
samplecnt_t write_unlocked (Sample */*dst*/, samplecnt_t /*cnt*/) { return 0; }
void set_header_natural_position () {}
int read_peaks_with_fpp (PeakData *peaks, samplecnt_t npeaks, samplepos_t /*start*/, samplecnt_t /*cnt*/,
double /*samples_per_pixel*/, samplecnt_t /*fpp*/) const {
memset (peaks, 0, sizeof (PeakData) * npeaks);
return 0;
}
float _sample_rate;
};
} // namespace ARDOUR
#endif /* __ardour_audiofilesource_h__ */
|
