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/*
Copyright (C) 2019-2021 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 "video_view.h"
#include "wx_util.h"
#include "film_viewer.h"
#include "lib/butler.h"
#include "lib/dcpomatic_log.h"
#include <boost/optional.hpp>
#include <sys/time.h>
using std::shared_ptr;
using boost::optional;
static constexpr int TOO_MANY_DROPPED_FRAMES = 20;
static constexpr int TOO_MANY_DROPPED_PERIOD = 5.0;
VideoView::VideoView (FilmViewer* viewer)
: _viewer (viewer)
, _state_timer ("viewer")
{
}
void
VideoView::clear ()
{
boost::mutex::scoped_lock lm (_mutex);
_player_video.first.reset ();
_player_video.second = dcpomatic::DCPTime ();
}
/** Could be called from any thread.
* @param non_blocking true to return false quickly if no video is available quickly.
* @return FAIL if there's no frame, AGAIN if the method should be called again, or SUCCESS
* if there is a frame.
*/
VideoView::NextFrameResult
VideoView::get_next_frame (bool non_blocking)
{
PeriodTimer timer("get_next_frame");
if (length() == dcpomatic::DCPTime()) {
return FAIL;
}
auto butler = _viewer->butler ();
if (!butler) {
return FAIL;
}
add_get ();
boost::mutex::scoped_lock lm (_mutex);
do {
Butler::Error e;
auto pv = butler->get_video (non_blocking ? Butler::Behaviour::NON_BLOCKING : Butler::Behaviour::BLOCKING, &e);
if (e.code == Butler::Error::Code::DIED) {
LOG_ERROR ("Butler died with %1", e.summary());
}
if (!pv.first) {
return e.code == Butler::Error::Code::AGAIN ? AGAIN : FAIL;
}
_player_video = pv;
} while (
_player_video.first &&
_three_d &&
_eyes != _player_video.first->eyes() &&
_player_video.first->eyes() != Eyes::BOTH
);
if (_player_video.first && _player_video.first->error()) {
++_errored;
}
return SUCCESS;
}
dcpomatic::DCPTime
VideoView::one_video_frame () const
{
return dcpomatic::DCPTime::from_frames (1, video_frame_rate());
}
/** @return Time in ms until the next frame is due, or empty if nothing is due */
optional<int>
VideoView::time_until_next_frame () const
{
if (length() == dcpomatic::DCPTime()) {
/* There's no content, so this doesn't matter */
return {};
}
auto const next = position() + one_video_frame();
auto const time = _viewer->audio_time().get_value_or(position());
if (next < time) {
return 0;
}
return (next.seconds() - time.seconds()) * 1000;
}
void
VideoView::start ()
{
boost::mutex::scoped_lock lm (_mutex);
_dropped = 0;
_errored = 0;
gettimeofday(&_dropped_check_period_start, nullptr);
}
bool
VideoView::reset_metadata (shared_ptr<const Film> film, dcp::Size player_video_container_size)
{
auto pv = player_video ();
if (!pv.first) {
return false;
}
if (!pv.first->reset_metadata(film, player_video_container_size)) {
return false;
}
update ();
return true;
}
void
VideoView::add_dropped ()
{
bool too_many = false;
{
boost::mutex::scoped_lock lm (_mutex);
++_dropped;
if (_dropped > TOO_MANY_DROPPED_FRAMES) {
struct timeval now;
gettimeofday (&now, nullptr);
double const elapsed = seconds(now) - seconds(_dropped_check_period_start);
too_many = elapsed < TOO_MANY_DROPPED_PERIOD;
_dropped = 0;
_dropped_check_period_start = now;
}
}
if (too_many) {
emit (boost::bind(boost::ref(TooManyDropped)));
}
}
wxColour
VideoView::pad_colour () const
{
if (_viewer->pad_black()) {
return wxColour(0, 0, 0);
} else if (gui_is_dark()) {
return wxColour(50, 50, 50);
} else {
return wxColour(240, 240, 240);
}
}
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