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/*
Copyright (C) 2013 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 <libcxml/cxml.h>
#include "audio_content.h"
#include "analyse_audio_job.h"
#include "job_manager.h"
#include "film.h"
#include "exceptions.h"
#include "config.h"
#include "i18n.h"
using std::string;
using std::vector;
using boost::shared_ptr;
using boost::lexical_cast;
using boost::dynamic_pointer_cast;
int const AudioContentProperty::AUDIO_CHANNELS = 200;
int const AudioContentProperty::AUDIO_LENGTH = 201;
int const AudioContentProperty::AUDIO_FRAME_RATE = 202;
int const AudioContentProperty::AUDIO_GAIN = 203;
int const AudioContentProperty::AUDIO_DELAY = 204;
int const AudioContentProperty::AUDIO_MAPPING = 205;
AudioContent::AudioContent (shared_ptr<const Film> f, DCPTime s)
: Content (f, s)
, _audio_gain (0)
, _audio_delay (Config::instance()->default_audio_delay ())
{
}
AudioContent::AudioContent (shared_ptr<const Film> f, boost::filesystem::path p)
: Content (f, p)
, _audio_gain (0)
, _audio_delay (Config::instance()->default_audio_delay ())
{
}
AudioContent::AudioContent (shared_ptr<const Film> f, shared_ptr<const cxml::Node> node)
: Content (f, node)
{
LocaleGuard lg;
_audio_gain = node->number_child<float> ("AudioGain");
_audio_delay = node->number_child<int> ("AudioDelay");
}
AudioContent::AudioContent (shared_ptr<const Film> f, vector<shared_ptr<Content> > c)
: Content (f, c)
{
shared_ptr<AudioContent> ref = dynamic_pointer_cast<AudioContent> (c[0]);
assert (ref);
for (size_t i = 0; i < c.size(); ++i) {
shared_ptr<AudioContent> ac = dynamic_pointer_cast<AudioContent> (c[i]);
if (ac->audio_gain() != ref->audio_gain()) {
throw JoinError (_("Content to be joined must have the same audio gain."));
}
if (ac->audio_delay() != ref->audio_delay()) {
throw JoinError (_("Content to be joined must have the same audio delay."));
}
}
_audio_gain = ref->audio_gain ();
_audio_delay = ref->audio_delay ();
}
void
AudioContent::as_xml (xmlpp::Node* node) const
{
LocaleGuard lg;
boost::mutex::scoped_lock lm (_mutex);
node->add_child("AudioGain")->add_child_text (lexical_cast<string> (_audio_gain));
node->add_child("AudioDelay")->add_child_text (lexical_cast<string> (_audio_delay));
}
void
AudioContent::set_audio_gain (float g)
{
{
boost::mutex::scoped_lock lm (_mutex);
_audio_gain = g;
}
signal_changed (AudioContentProperty::AUDIO_GAIN);
}
void
AudioContent::set_audio_delay (int d)
{
{
boost::mutex::scoped_lock lm (_mutex);
_audio_delay = d;
}
signal_changed (AudioContentProperty::AUDIO_DELAY);
}
boost::signals2::connection
AudioContent::analyse_audio (boost::function<void()> finished)
{
shared_ptr<const Film> film = _film.lock ();
assert (film);
shared_ptr<AnalyseAudioJob> job (new AnalyseAudioJob (film, dynamic_pointer_cast<AudioContent> (shared_from_this())));
boost::signals2::connection c = job->Finished.connect (finished);
JobManager::instance()->add (job);
return c;
}
boost::filesystem::path
AudioContent::audio_analysis_path () const
{
shared_ptr<const Film> film = _film.lock ();
if (!film) {
return boost::filesystem::path ();
}
return film->audio_analysis_path (dynamic_pointer_cast<const AudioContent> (shared_from_this ()));
}
string
AudioContent::technical_summary () const
{
return String::compose ("audio: channels %1, length %2, raw rate %3, out rate %4", audio_channels(), audio_length(), content_audio_frame_rate(), output_audio_frame_rate());
}
/** Note: this is not particularly fast, as the FrameRateChange lookup
* is not very intelligent.
*
* @param t Some duration to convert.
* @param at The time within the DCP to get the active frame rate change from; i.e. a point at which
* the `controlling' video content is active.
*/
AudioContent::Frame
AudioContent::time_to_content_audio_frames (DCPTime t, DCPTime at) const
{
shared_ptr<const Film> film = _film.lock ();
assert (film);
/* Consider the case where we're running a 25fps video at 24fps (i.e. slow)
Our audio is at 44.1kHz. We will resample it to 48000 * 25 / 24 and then
run it at 48kHz (i.e. slow, to match).
After 1 second, we'll have run the equivalent of 44.1kHz * 24 / 25 samples
in the source.
*/
return rint (t * content_audio_frame_rate() * film->active_frame_rate_change(at).speed_up / TIME_HZ);
}
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