2 Copyright (C) 2016-2021 Carl Hetherington <cth@carlh.net>
4 This file is part of DCP-o-matic.
6 DCP-o-matic is free software; you can redistribute it and/or modify
7 it under the terms of the GNU General Public License as published by
8 the Free Software Foundation; either version 2 of the License, or
9 (at your option) any later version.
11 DCP-o-matic is distributed in the hope that it will be useful,
12 but WITHOUT ANY WARRANTY; without even the implied warranty of
13 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
14 GNU General Public License for more details.
16 You should have received a copy of the GNU General Public License
17 along with DCP-o-matic. If not, see <http://www.gnu.org/licenses/>.
22 #include "audio_ring_buffers.h"
23 #include "dcpomatic_assert.h"
24 #include "exceptions.h"
33 using std::shared_ptr;
34 using boost::optional;
35 using namespace dcpomatic;
38 AudioRingBuffers::AudioRingBuffers ()
44 /** @param frame_rate Frame rate in use; this is only used to check timing consistency of the incoming data */
46 AudioRingBuffers::put (shared_ptr<const AudioBuffers> data, DCPTime time, int frame_rate)
48 boost::mutex::scoped_lock lm (_mutex);
50 if (!_buffers.empty()) {
51 DCPOMATIC_ASSERT (_buffers.front().first->channels() == data->channels());
52 DCPTime const end = (_buffers.back().second + DCPTime::from_frames(_buffers.back().first->frames(), frame_rate));
53 if (labs(end.get() - time.get()) > 1) {
54 cout << "bad put " << to_string(_buffers.back().second) << " " << _buffers.back().first->frames() << " " << to_string(time) << "\n";
56 DCPOMATIC_ASSERT (labs(end.get() - time.get()) < 2);
59 _buffers.push_back(make_pair(data, time));
63 /** @return time of the returned data; if it's not set this indicates an underrun */
65 AudioRingBuffers::get (float* out, int channels, int frames)
67 boost::mutex::scoped_lock lm (_mutex);
69 optional<DCPTime> time;
72 if (_buffers.empty ()) {
73 for (int i = 0; i < frames; ++i) {
74 for (int j = 0; j < channels; ++j) {
78 cout << "audio underrun; missing " << frames << "!\n";
82 auto front = _buffers.front ();
84 time = front.second + DCPTime::from_frames(_used_in_head, 48000);
87 int const to_do = min (frames, front.first->frames() - _used_in_head);
88 float** p = front.first->data();
89 int const c = min (front.first->channels(), channels);
90 for (int i = 0; i < to_do; ++i) {
91 for (int j = 0; j < c; ++j) {
92 *out++ = p[j][i + _used_in_head];
94 for (int j = c; j < channels; ++j) {
98 _used_in_head += to_do;
101 if (_used_in_head == front.first->frames()) {
102 _buffers.pop_front ();
112 AudioRingBuffers::peek () const
114 boost::mutex::scoped_lock lm (_mutex);
115 if (_buffers.empty()) {
118 return _buffers.front().second;
123 AudioRingBuffers::clear ()
125 boost::mutex::scoped_lock lm (_mutex);
132 AudioRingBuffers::size () const
134 boost::mutex::scoped_lock lm (_mutex);
136 for (auto const& i: _buffers) {
137 s += i.first->frames();
139 return s - _used_in_head;