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livetrax/libs/ardour/audio_buffer.cc

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C++

/*
* Copyright (C) 2007-2010 David Robillard <d@drobilla.net>
* Copyright (C) 2007-2017 Paul Davis <paul@linuxaudiosystems.com>
* Copyright (C) 2013-2014 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.
*/
#include <errno.h>
#include "ardour/audio_buffer.h"
#include "pbd/error.h"
#include "pbd/malign.h"
#include "pbd/i18n.h"
using namespace PBD;
using namespace ARDOUR;
AudioBuffer::AudioBuffer(size_t capacity)
: Buffer (DataType::AUDIO)
, _owns_data (false)
, _data (0)
{
if (capacity) {
_owns_data = true; // prevent resize() from gagging
resize (capacity);
_silent = false; // force silence on the intial buffer state
clear ();
}
}
AudioBuffer::~AudioBuffer()
{
if (_owns_data)
cache_aligned_free(_data);
}
void
AudioBuffer::resize (size_t size)
{
if (!_owns_data) {
/* XXX how the hell is this enforced? */
_capacity = size;
return;
}
if (_data && size < _capacity) {
/* buffer is already large enough */
return;
}
cache_aligned_free (_data);
cache_aligned_malloc ((void**) &_data, sizeof (Sample) * size);
_capacity = size;
_silent = false;
}
bool
AudioBuffer::check_silence (pframes_t nframes, pframes_t& n) const
{
for (n = 0; n < nframes; ++n) {
if (_data[n] != Sample (0)) {
return false;
}
}
return true;
}
void
AudioBuffer::silence (samplecnt_t len, samplecnt_t offset) {
if (!_silent) {
assert(_capacity > 0);
assert(offset + len <= _capacity);
memset(_data + offset, 0, sizeof (Sample) * len);
if (len == _capacity) {
_silent = true;
}
}
_written = true;
}