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/*
Copyright (C) 2015-2021 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_delay.h"
#include "audio_buffers.h"
#include "dcpomatic_assert.h"
#include <iostream>
using std::cout;
using std::make_shared;
using std::shared_ptr;
AudioDelay::AudioDelay(int samples)
: _samples(samples)
{
}
shared_ptr<AudioBuffers>
AudioDelay::run(shared_ptr<const AudioBuffers> in)
{
/* You can't call this with varying channel counts */
DCPOMATIC_ASSERT(!_tail || in->channels() == _tail->channels());
auto out = make_shared<AudioBuffers>(in->channels(), in->frames());
if (in->frames() > _samples) {
if (!_tail) {
/* No tail; use silence */
out->make_silent(0, _samples);
} else {
/* Copy tail */
out->copy_from(_tail.get(), _samples, 0, 0);
}
/* Copy in to out */
out->copy_from(in.get(), in->frames() - _samples, 0, _samples);
/* Keep tail */
if (!_tail) {
_tail = make_shared<AudioBuffers>(in->channels(), _samples);
}
_tail->copy_from(in.get(), _samples, in->frames() - _samples, 0);
} else {
/* First part of the tail into the output */
if (_tail) {
out->copy_from(_tail.get(), out->frames(), 0, 0);
} else {
out->make_silent();
_tail = make_shared<AudioBuffers>(out->channels(), _samples);
_tail->make_silent();
}
/* Shuffle the tail down */
_tail->move(_tail->frames() - out->frames(), out->frames(), 0);
/* Copy input into the tail */
_tail->copy_from(in.get(), in->frames(), 0, _tail->frames() - in->frames());
}
return out;
}
void
AudioDelay::flush()
{
_tail.reset();
}
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