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/*
Copyright (C) 2012-2015 Carl Hetherington <cth@carlh.net>
This program 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.
This program 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 this program; if not, write to the Free Software
Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
*/
#include "audio_analysis.h"
#include "audio_buffers.h"
#include "analyse_audio_job.h"
#include "audio_content.h"
#include "compose.hpp"
#include "film.h"
#include "player.h"
#include "playlist.h"
#include <boost/foreach.hpp>
#include <iostream>
#include "i18n.h"
using std::string;
using std::max;
using std::min;
using std::cout;
using boost::shared_ptr;
using boost::dynamic_pointer_cast;
int const AnalyseAudioJob::_num_points = 1024;
AnalyseAudioJob::AnalyseAudioJob (shared_ptr<const Film> film, shared_ptr<const Playlist> playlist)
: Job (film)
, _playlist (playlist)
, _done (0)
, _samples_per_point (1)
, _current (0)
, _overall_peak (0)
, _overall_peak_frame (0)
{
}
AnalyseAudioJob::~AnalyseAudioJob ()
{
delete[] _current;
}
string
AnalyseAudioJob::name () const
{
return _("Analyse audio");
}
string
AnalyseAudioJob::json_name () const
{
return N_("analyse_audio");
}
void
AnalyseAudioJob::run ()
{
shared_ptr<Player> player (new Player (_film, _playlist));
player->set_ignore_video ();
player->set_fast ();
player->set_play_referenced ();
DCPTime const start = _playlist->start().get_value_or (DCPTime ());
DCPTime const length = _playlist->length ();
Frame const len = DCPTime (length - start).frames_round (_film->audio_frame_rate());
_samples_per_point = max (int64_t (1), len / _num_points);
delete[] _current;
_current = new AudioPoint[_film->audio_channels ()];
_analysis.reset (new AudioAnalysis (_film->audio_channels ()));
bool has_any_audio = false;
BOOST_FOREACH (shared_ptr<Content> c, _playlist->content ()) {
if (dynamic_pointer_cast<AudioContent> (c)) {
has_any_audio = true;
}
}
if (has_any_audio) {
_done = 0;
DCPTime const block = DCPTime::from_seconds (1.0 / 8);
for (DCPTime t = start; t < length; t += block) {
analyse (player->get_audio (t, block, false));
set_progress ((t.seconds() - start.seconds()) / (length.seconds() - start.seconds()));
}
}
_analysis->set_peak (_overall_peak, DCPTime::from_frames (_overall_peak_frame, _film->audio_frame_rate ()));
if (_playlist->content().size() == 1) {
/* If there was only one piece of content in this analysis we may later need to know what its
gain was when we analysed it.
*/
shared_ptr<const AudioContent> ac = dynamic_pointer_cast<const AudioContent> (_playlist->content().front ());
DCPOMATIC_ASSERT (ac);
_analysis->set_analysis_gain (ac->audio_gain ());
}
_analysis->write (_film->audio_analysis_path (_playlist));
set_progress (1);
set_state (FINISHED_OK);
}
void
AnalyseAudioJob::analyse (shared_ptr<const AudioBuffers> b)
{
int const frames = b->frames ();
int const channels = b->channels ();
for (int j = 0; j < channels; ++j) {
float* data = b->data(j);
for (int i = 0; i < frames; ++i) {
float s = data[i];
float as = fabsf (s);
if (as < 10e-7) {
/* SafeStringStream can't serialise and recover inf or -inf, so prevent such
values by replacing with this (140dB down) */
s = as = 10e-7;
}
_current[j][AudioPoint::RMS] += pow (s, 2);
_current[j][AudioPoint::PEAK] = max (_current[j][AudioPoint::PEAK], as);
if (as > _overall_peak) {
_overall_peak = as;
_overall_peak_frame = _done + i;
}
if (((_done + i) % _samples_per_point) == 0) {
_current[j][AudioPoint::RMS] = sqrt (_current[j][AudioPoint::RMS] / _samples_per_point);
_analysis->add_point (j, _current[j]);
_current[j] = AudioPoint ();
}
}
}
_done += frames;
}
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