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/* -*-c++-*- OpenSceneGraph - Copyright (C) 1998-2008 Robert Osfield
*
* This library is open source and may be redistributed and/or modified under
* the terms of the OpenSceneGraph Public License (OSGPL) version 0.0 or
* (at your option) any later version. The full license is in LICENSE file
* included with this distribution, and on the openscenegraph.org website.
*
* This library 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
* OpenSceneGraph Public License for more details.
*/
#include "VideoFrameDispatcher.h"
#include <iostream>
#include <osg/Timer>
namespace osgVideo {
VideoImageStream::VideoImageStream()
: osg::ImageStream()
, _needsDispatching(false)
, _dispatcher(NULL)
, _queue(NULL)
{
}
VideoImageStream::VideoImageStream(const VideoImageStream& image,const osg::CopyOp& copyop)
: osg::ImageStream(image, copyop)
, _needsDispatching(image._needsDispatching)
, _dispatcher(image._dispatcher)
, _queue(NULL)
{
}
VideoImageStream::~VideoImageStream()
{
setNeedsDispatching(StopUpdate);
_dispatcher = NULL;
}
bool VideoImageStream::setNeedsDispatching(RequestMode request_mode)
{
_needsDispatching = (_needsDispatching || (request_mode == RequestContinuousUpdate)) && (request_mode != StopUpdate);
if (!_dispatcher)
return false;
if (request_mode == StopUpdate) {
_dispatcher->removeFromQueue(this);
}
else
{
_dispatcher->addToQueue(this);
}
return (_dispatcher != NULL);
}
#pragma mark
VideoFrameDispatchQueue::VideoFrameDispatchQueue()
: OpenThreads::Thread()
, osg::Referenced()
, _queue()
, _numItems(0)
, _block()
, _mutex()
, _finished(false)
{
}
void VideoFrameDispatchQueue::run()
{
osg::Timer t;
static unsigned int frame_delay = 1000 * 1000 / 120;
_block.reset();
_block.block();
while(!_finished)
{
unsigned int num_items(0);
{
osg::Timer_t last_tick(t.tick());
OpenThreads::ScopedLock<OpenThreads::Mutex> lock(_mutex);
for(Queue::iterator i = _queue.begin(); i != _queue.end(); )
{
osg::observer_ptr<VideoImageStream> stream(*i);
if (stream.valid() && stream->needsDispatching())
{
if (stream.valid())
stream->decodeFrame();
++num_items;
++i;
}
else
{
if (stream.valid())
stream->setDispatchQueue(NULL);
_queue.erase(i++);
}
}
_numItems = num_items;
if (_numItems > 0)
{
unsigned int dt = t.delta_u(last_tick, t.tick());
if (dt < frame_delay) {
OpenThreads::Thread::microSleep(frame_delay - dt);
}
}
}
if (_numItems == 0)
{
// std::cout << this << " blocking" << std::endl;
_block.reset();
_block.block();
}
}
}
void VideoFrameDispatchQueue::addItem(osgVideo::VideoImageStream *stream)
{
if (_finished) return;
OpenThreads::ScopedLock<OpenThreads::Mutex> lock(_mutex);
_queue.insert(stream);
stream->setDispatchQueue(this);
_numItems = _queue.size();
_block.release();
// std::cout << this << " release" << std::endl;
}
void VideoFrameDispatchQueue::removeItem(osgVideo::VideoImageStream* stream)
{
stream->setDispatchQueue(NULL);
OpenThreads::ScopedLock<OpenThreads::Mutex> lock(_mutex);
_queue.erase(stream);
_numItems = _queue.size();
}
VideoFrameDispatchQueue::~VideoFrameDispatchQueue()
{
_finished = true;
_block.release();
join();
}
#pragma mark
VideoFrameDispatcher::VideoFrameDispatcher(unsigned int num_threads)
: osg::Referenced()
, _queues()
{
num_threads = num_threads ? num_threads : OpenThreads::GetNumberOfProcessors();
OSG_ALWAYS << "VideoFrameDispatcher: creating " << num_threads << " queues." << std::endl;
for(unsigned int i = 0; i < num_threads; ++i)
{
VideoFrameDispatchQueue* q = new VideoFrameDispatchQueue();
q->start();
_queues.push_back(q);
}
}
void VideoFrameDispatcher::addToQueue(VideoImageStream *stream)
{
stream->setThreadSafeRefUnref(true);
if (stream->getDispatchQueue())
return;
VideoFrameDispatchQueue* queue = *std::min_element(_queues.begin(), _queues.end(), VideoFrameDispatchQueueComparator());
queue->addItem(stream);
}
void VideoFrameDispatcher::removeFromQueue(VideoImageStream* stream)
{
if (stream->getDispatchQueue())
stream->getDispatchQueue()->removeItem(stream);
}
}
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