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/*
Copyright (C) 2016-2021 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_ring_buffers.h"
#include "dcpomatic_assert.h"
#include "exceptions.h"
#include <iostream>
using std::min;
using std::cout;
using std::make_pair;
using std::pair;
using std::list;
using std::shared_ptr;
using boost::optional;
using namespace dcpomatic;
AudioRingBuffers::AudioRingBuffers()
{
}
/** @param frame_rate Frame rate in use; this is only used to check timing consistency of the incoming data */
void
AudioRingBuffers::put(shared_ptr<const AudioBuffers> data, DCPTime time, int frame_rate)
{
boost::mutex::scoped_lock lm(_mutex);
if (!_buffers.empty()) {
DCPOMATIC_ASSERT(_buffers.front().first->channels() == data->channels());
DCPTime const end = (_buffers.back().second + DCPTime::from_frames(_buffers.back().first->frames(), frame_rate));
if (labs(end.get() - time.get()) > 1) {
cout << "bad put " << to_string(_buffers.back().second) << " " << _buffers.back().first->frames() << " " << to_string(time) << "\n";
}
DCPOMATIC_ASSERT(labs(end.get() - time.get()) < 2);
}
_buffers.push_back(make_pair(data, time));
}
/** @return time of the returned data; if it's not set this indicates an underrun */
optional<DCPTime>
AudioRingBuffers::get(float* out, int channels, int frames)
{
boost::mutex::scoped_lock lm(_mutex);
optional<DCPTime> time;
while (frames > 0) {
if (_buffers.empty()) {
for (int i = 0; i < frames; ++i) {
for (int j = 0; j < channels; ++j) {
*out++ = 0;
}
}
return time;
}
auto front = _buffers.front();
if (!time) {
time = front.second + DCPTime::from_frames(_used_in_head, 48000);
}
int const to_do = min(frames, front.first->frames() - _used_in_head);
float* const* p = front.first->data();
int const c = min(front.first->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.first->frames()) {
_buffers.pop_front();
_used_in_head = 0;
}
}
return time;
}
optional<DCPTime>
AudioRingBuffers::peek() const
{
boost::mutex::scoped_lock lm(_mutex);
if (_buffers.empty()) {
return {};
}
return _buffers.front().second;
}
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;
for (auto const& i: _buffers) {
s += i.first->frames();
}
return s - _used_in_head;
}
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