2 Copyright (C) 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_analyser.h"
23 #include "audio_analysis.h"
24 #include "audio_buffers.h"
25 #include "audio_content.h"
26 #include "audio_filter_graph.h"
27 #include "audio_point.h"
29 #include "dcpomatic_log.h"
33 #include <dcp/warnings.h>
36 LIBDCP_DISABLE_WARNINGS
37 #include <libavutil/channel_layout.h>
38 #ifdef DCPOMATIC_HAVE_EBUR128_PATCHED_FFMPEG
39 #include <libavfilter/f_ebur128.h>
41 LIBDCP_ENABLE_WARNINGS
45 using std::make_shared;
47 using std::shared_ptr;
49 using namespace dcpomatic;
52 static auto constexpr num_points = 1024;
55 AudioAnalyser::AudioAnalyser (shared_ptr<const Film> film, shared_ptr<const Playlist> playlist, bool from_zero, std::function<void (float)> set_progress)
57 , _playlist (playlist)
58 , _set_progress (set_progress)
59 #ifdef DCPOMATIC_HAVE_EBUR128_PATCHED_FFMPEG
60 , _ebur128 (new AudioFilterGraph(film->audio_frame_rate(), film->audio_channels()))
62 , _sample_peak (film->audio_channels())
63 , _sample_peak_frame (film->audio_channels())
64 , _analysis (film->audio_channels())
67 #ifdef DCPOMATIC_HAVE_EBUR128_PATCHED_FFMPEG
68 _filters.push_back (new Filter("ebur128", "ebur128", "audio", "ebur128=peak=true"));
69 _ebur128->setup (_filters);
72 _current = std::vector<AudioPoint>(_film->audio_channels());
75 _start = _playlist->start().get_value_or(DCPTime());
78 for (int i = 0; i < film->audio_channels(); ++i) {
80 _sample_peak_frame[i] = 0;
83 auto add_if_required = [](vector<double>& v, size_t i, double db) {
85 v[i] = pow(10, db / 20);
89 int leqm_channels = film->audio_channels();
90 auto content = _playlist->content();
91 if (content.size() == 1 && content[0]->audio) {
92 leqm_channels = content[0]->audio->mapping().mapped_output_channels().size();
95 /* XXX: is this right? Especially for more than 5.1? */
96 vector<double> channel_corrections(leqm_channels, 1);
97 add_if_required (channel_corrections, 4, -3); // Ls
98 add_if_required (channel_corrections, 5, -3); // Rs
99 add_if_required (channel_corrections, 6, -144); // HI
100 add_if_required (channel_corrections, 7, -144); // VI
101 add_if_required (channel_corrections, 8, -3); // Lc
102 add_if_required (channel_corrections, 9, -3); // Rc
103 add_if_required (channel_corrections, 10, -3); // Lc
104 add_if_required (channel_corrections, 11, -3); // Rc
105 add_if_required (channel_corrections, 12, -144); // DBox
106 add_if_required (channel_corrections, 13, -144); // Sync
107 add_if_required (channel_corrections, 14, -144); // Sign Language
108 add_if_required (channel_corrections, 15, -144); // Unused
110 _leqm.reset(new leqm_nrt::Calculator(
112 film->audio_frame_rate(),
115 850, // suggested by leqm_nrt CLI source
116 64, // suggested by leqm_nrt CLI source
117 boost::thread::hardware_concurrency()
120 DCPTime const length = _playlist->length (_film);
122 Frame const len = DCPTime (length - _start).frames_round (film->audio_frame_rate());
123 _samples_per_point = max (int64_t (1), len / num_points);
127 AudioAnalyser::~AudioAnalyser ()
129 for (auto i: _filters) {
130 delete const_cast<Filter*> (i);
136 AudioAnalyser::analyse (shared_ptr<AudioBuffers> b, DCPTime time)
138 LOG_DEBUG_AUDIO_ANALYSIS("AudioAnalyser received %1 frames at %2", b->frames(), to_string(time));
139 DCPOMATIC_ASSERT (time >= _start);
140 /* In bug #2364 we had a lot of frames arriving here (~47s worth) which
141 * caused an OOM error on Windows. Check for the number of frames being
142 * reasonable here to make sure we catch this if it happens again.
144 DCPOMATIC_ASSERT(b->frames() < 480000);
146 #ifdef DCPOMATIC_HAVE_EBUR128_PATCHED_FFMPEG
147 if (Config::instance()->analyse_ebur128 ()) {
148 _ebur128->process (b);
152 int const frames = b->frames ();
153 int const channels = b->channels ();
154 vector<double> interleaved(frames * channels);
156 for (int j = 0; j < channels; ++j) {
157 float const* data = b->data(j);
158 for (int i = 0; i < frames; ++i) {
161 interleaved[i * channels + j] = s;
163 float as = fabsf (s);
165 /* We may struggle to serialise and recover inf or -inf, so prevent such
166 values by replacing with this (140dB down) */
169 _current[j][AudioPoint::RMS] += pow (s, 2);
170 _current[j][AudioPoint::PEAK] = max (_current[j][AudioPoint::PEAK], as);
172 if (as > _sample_peak[j]) {
173 _sample_peak[j] = as;
174 _sample_peak_frame[j] = _done + i;
177 if (((_done + i) % _samples_per_point) == 0) {
178 _current[j][AudioPoint::RMS] = sqrt (_current[j][AudioPoint::RMS] / _samples_per_point);
179 _analysis.add_point (j, _current[j]);
180 _current[j] = AudioPoint ();
185 _leqm->add(interleaved);
189 DCPTime const length = _playlist->length (_film);
190 _set_progress ((time.seconds() - _start.seconds()) / (length.seconds() - _start.seconds()));
191 LOG_DEBUG_AUDIO_ANALYSIS_NC("Frames processed");
196 AudioAnalyser::finish ()
198 vector<AudioAnalysis::PeakTime> sample_peak;
199 for (int i = 0; i < _film->audio_channels(); ++i) {
200 sample_peak.push_back (
201 AudioAnalysis::PeakTime (_sample_peak[i], DCPTime::from_frames (_sample_peak_frame[i], _film->audio_frame_rate ()))
204 _analysis.set_sample_peak (sample_peak);
206 #ifdef DCPOMATIC_HAVE_EBUR128_PATCHED_FFMPEG
207 if (Config::instance()->analyse_ebur128 ()) {
208 void* eb = _ebur128->get("Parsed_ebur128_0")->priv;
209 vector<float> true_peak;
210 for (int i = 0; i < _film->audio_channels(); ++i) {
211 true_peak.push_back (av_ebur128_get_true_peaks(eb)[i]);
213 _analysis.set_true_peak (true_peak);
214 _analysis.set_integrated_loudness (av_ebur128_get_integrated_loudness(eb));
215 _analysis.set_loudness_range (av_ebur128_get_loudness_range(eb));
219 if (_playlist->content().size() == 1) {
220 /* If there was only one piece of content in this analysis we may later need to know what its
221 gain was when we analysed it.
223 if (auto ac = _playlist->content().front()->audio) {
224 _analysis.set_analysis_gain (ac->gain());
228 _analysis.set_samples_per_point (_samples_per_point);
229 _analysis.set_sample_rate (_film->audio_frame_rate ());
230 _analysis.set_leqm (_leqm->leq_m());