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/*
Copyright (C) 2016-2017 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 "butler.h"
#include "player.h"
#include <boost/weak_ptr.hpp>
#include <boost/shared_ptr.hpp>
using std::cout;
using std::pair;
using std::make_pair;
using boost::weak_ptr;
using boost::shared_ptr;
using boost::bind;
using boost::optional;
/** Video readahead in frames */
#define VIDEO_READAHEAD 10
/** Audio readahead in frames */
#define AUDIO_READAHEAD (48000*5)
Butler::Butler (weak_ptr<const Film> film, shared_ptr<Player> player, AudioMapping audio_mapping, int audio_channels)
: _film (film)
, _player (player)
, _pending_seek_accurate (false)
, _finished (false)
, _died (false)
, _stop_thread (false)
, _audio_mapping (audio_mapping)
, _audio_channels (audio_channels)
, _disable_audio (false)
{
_player_video_connection = _player->Video.connect (bind (&Butler::video, this, _1, _2));
_player_audio_connection = _player->Audio.connect (bind (&Butler::audio, this, _1, _2));
_player_changed_connection = _player->Changed.connect (bind (&Butler::player_changed, this));
_thread = new boost::thread (bind (&Butler::thread, this));
}
Butler::~Butler ()
{
{
boost::mutex::scoped_lock lm (_mutex);
_stop_thread = true;
}
_thread->interrupt ();
try {
_thread->join ();
} catch (boost::thread_interrupted& e) {
/* No problem */
}
delete _thread;
}
/** Caller must hold a lock on _mutex */
bool
Butler::should_run () const
{
return (_video.size() < VIDEO_READAHEAD || (!_disable_audio && _audio.size() < AUDIO_READAHEAD)) && !_stop_thread && !_finished && !_died;
}
void
Butler::thread ()
try
{
while (true) {
boost::mutex::scoped_lock lm (_mutex);
/* Wait until we have something to do */
while (!should_run() && !_pending_seek_position) {
_summon.wait (lm);
}
/* Do any seek that has been requested */
if (_pending_seek_position) {
_video.clear ();
_audio.clear ();
_finished = false;
_player->seek (*_pending_seek_position, _pending_seek_accurate);
_pending_seek_position = optional<DCPTime> ();
}
/* Fill _video and _audio. Don't try to carry on if a pending seek appears
while lm is unlocked, as in that state nothing will be added to
_video/_audio.
*/
while (should_run() && !_pending_seek_position) {
lm.unlock ();
bool const r = _player->pass ();
lm.lock ();
if (r) {
_finished = true;
_arrived.notify_all ();
break;
}
_arrived.notify_all ();
}
}
} catch (boost::thread_interrupted) {
/* The butler thread is being terminated */
boost::mutex::scoped_lock lm (_mutex);
_finished = true;
_arrived.notify_all ();
} catch (...) {
store_current ();
boost::mutex::scoped_lock lm (_mutex);
_died = true;
_arrived.notify_all ();
}
pair<shared_ptr<PlayerVideo>, DCPTime>
Butler::get_video ()
{
boost::mutex::scoped_lock lm (_mutex);
/* Wait for data if we have none */
while (_video.empty() && !_finished && !_died) {
_arrived.wait (lm);
}
if (_video.empty()) {
return make_pair (shared_ptr<PlayerVideo>(), DCPTime());
}
pair<shared_ptr<PlayerVideo>, DCPTime> const r = _video.get ();
_summon.notify_all ();
return r;
}
void
Butler::seek (DCPTime position, bool accurate)
{
boost::mutex::scoped_lock lm (_mutex);
if (_died) {
return;
}
_pending_seek_position = position;
_pending_seek_accurate = accurate;
_summon.notify_all ();
}
void
Butler::video (shared_ptr<PlayerVideo> video, DCPTime time)
{
{
boost::mutex::scoped_lock lm (_mutex);
if (_pending_seek_position) {
/* Don't store any video while a seek is pending */
return;
}
}
_video.put (video, time);
}
void
Butler::audio (shared_ptr<AudioBuffers> audio, DCPTime time)
{
{
boost::mutex::scoped_lock lm (_mutex);
if (_pending_seek_position || _disable_audio) {
/* Don't store any audio while a seek is pending, or if audio is disabled */
return;
}
}
_audio.put (audio, time);
}
void
Butler::player_changed ()
{
optional<DCPTime> t;
{
boost::mutex::scoped_lock lm (_mutex);
t = _video.earliest ();
}
if (t) {
seek (*t, true);
} else {
_video.clear ();
_audio.clear ();
}
}
void
Butler::get_audio (float* out, Frame frames)
{
_audio.get (out, _audio_channels, frames);
_summon.notify_all ();
}
void
Butler::disable_audio ()
{
boost::mutex::scoped_lock lm (_mutex);
_disable_audio = true;
}
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