79 lines
2.5 KiB
C++
79 lines
2.5 KiB
C++
/*
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* Copyright (C) 2007-2017 Paul Davis <paul@linuxaudiosystems.com>
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* Copyright (C) 2008-2011 David Robillard <d@drobilla.net>
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* Copyright (C) 2009-2010 Carl Hetherington <carl@carlh.net>
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* Copyright (C) 2013 John Emmas <john@creativepost.co.uk>
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* Copyright (C) 2016-2018 Robin Gareus <robin@gareus.org>
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation; either version 2 of the License, or
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* (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License along
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* with this program; if not, write to the Free Software Foundation, Inc.,
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* 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
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*/
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#ifndef __ardour_silentfilesource_h__
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#define __ardour_silentfilesource_h__
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#include <cstring>
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#include "ardour/audiofilesource.h"
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namespace ARDOUR {
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class LIBARDOUR_API SilentFileSource : public AudioFileSource {
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public:
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int update_header (samplepos_t /*when*/, struct tm&, time_t) { return 0; }
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int flush_header () { return 0; }
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float sample_rate () const { return _sample_rate; }
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void set_length (samplecnt_t len) { _length = timecnt_t (len); }
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void flush () {}
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bool can_be_analysed() const { return false; }
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bool clamped_at_unity() const { return false; }
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protected:
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void close() {}
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friend class SourceFactory;
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SilentFileSource (Session& s, const XMLNode& x, samplecnt_t len, float srate)
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: Source (s, x)
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, AudioFileSource (s, x, false)
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, _sample_rate(srate)
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{
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_length = timecnt_t (len);
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}
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samplecnt_t read_unlocked (Sample *dst, samplepos_t start, samplecnt_t cnt) const {
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cnt = std::min (cnt, std::max<samplecnt_t> (0, _length.samples() - start));
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memset (dst, 0, sizeof (Sample) * cnt);
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return cnt;
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}
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samplecnt_t write_unlocked (Sample */*dst*/, samplecnt_t /*cnt*/) { return 0; }
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void set_header_natural_position () {}
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int read_peaks_with_fpp (PeakData *peaks, samplecnt_t npeaks, samplepos_t /*start*/, samplecnt_t /*cnt*/,
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double /*samples_per_pixel*/, samplecnt_t /*fpp*/) const {
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memset (peaks, 0, sizeof (PeakData) * npeaks);
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return 0;
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}
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float _sample_rate;
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};
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} // namespace ARDOUR
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#endif /* __ardour_audiofilesource_h__ */
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