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/*
Copyright (C) 2016-2017 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_ring_buffers.h"
#include "dcpomatic_assert.h"
#include "exceptions.h"
#include <boost/foreach.hpp>
#include <iostream>
using std::min;
using std::cout;
using boost::shared_ptr;
AudioRingBuffers::AudioRingBuffers ()
: _used_in_head (0)
{
}
void
AudioRingBuffers::put (shared_ptr<const AudioBuffers> data)
{
boost::mutex::scoped_lock lm (_mutex);
if (!_buffers.empty ()) {
DCPOMATIC_ASSERT (_buffers.front()->channels() == data->channels());
}
_buffers.push_back (data);
}
/** @return true if there was an underrun, otherwise false */
bool
AudioRingBuffers::get (float* out, int channels, int frames)
{
boost::mutex::scoped_lock lm (_mutex);
while (frames > 0) {
if (_buffers.empty ()) {
for (int i = 0; i < frames; ++i) {
for (int j = 0; j < channels; ++j) {
*out++ = 0;
}
}
cout << "audio underrun; missing " << frames << "!\n";
return true;
}
shared_ptr<const AudioBuffers> front = _buffers.front ();
int const to_do = min (frames, front->frames() - _used_in_head);
float** p = front->data();
int const c = min (front->channels(), channels);
for (int i = 0; i < to_do; ++i) {
for (int j = 0; j < c; ++j) {
*out++ = p[j][i + _used_in_head];
}
for (int j = c; j < channels; ++j) {
*out++ = 0;
}
}
_used_in_head += to_do;
frames -= to_do;
if (_used_in_head == front->frames()) {
_buffers.pop_front ();
_used_in_head = 0;
}
}
return false;
}
void
AudioRingBuffers::clear ()
{
boost::mutex::scoped_lock lm (_mutex);
_buffers.clear ();
_used_in_head = 0;
}
Frame
AudioRingBuffers::size () const
{
boost::mutex::scoped_lock lm (_mutex);
Frame s = 0;
BOOST_FOREACH (shared_ptr<const AudioBuffers> i, _buffers) {
s += i->frames ();
}
return s - _used_in_head;
}
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