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audacity/src/ondemand/ODWaveTrackTaskQueue.cpp
2016-04-06 16:06:36 -04:00

341 lines
9.2 KiB
C++

/**********************************************************************
Audacity: A Digital Audio Editor
ODWaveTrackTaskQueue.h
Created by Michael Chinen (mchinen) on 6/11/08
Audacity(R) is copyright (c) 1999-2008 Audacity Team.
License: GPL v2. See License.txt.
******************************************************************//**
\class ODWaveTrackTaskQueue
\brief watches over all to be done (not yet started and started but not finished)
tasks associated with a WaveTrack.
*//*******************************************************************/
#include "ODWaveTrackTaskQueue.h"
#include "ODTask.h"
#include "ODManager.h"
/// Constructs an ODWaveTrackTaskQueue
ODWaveTrackTaskQueue::ODWaveTrackTaskQueue()
{
}
ODWaveTrackTaskQueue::~ODWaveTrackTaskQueue()
{
//we need to DELETE all ODTasks. We will have to block or wait until block for the active ones.
for(unsigned int i=0;i<mTasks.size();i++)
{
mTasks[i]->TerminateAndBlock();//blocks if active.
//small chance we may have rea-added the task back into the queue from a diff thread. - so remove it if we have.
ODManager::Instance()->RemoveTaskIfInQueue(mTasks[i]);
delete mTasks[i];
}
}
///returns whether or not this queue's task list and another's can merge together, as when we make two mono tracks stereo.
bool ODWaveTrackTaskQueue::CanMergeWith(ODWaveTrackTaskQueue* otherQueue)
{
//have to be very careful when dealing with two lists that need to be locked.
if(GetNumTasks()!=otherQueue->GetNumTasks())
return false;
mTasksMutex.Lock();
for(unsigned int i=0;i<mTasks.size();i++)
{
if(!mTasks[i]->CanMergeWith(otherQueue->GetTask(i)))
{
mTasksMutex.Unlock();
return false;
}
}
mTasksMutex.Unlock();
return true;
}
///add track to the masterTrack's queue - this will allow future ODScheduling to affect them together.
/// sets the NeedODUpdateFlag since we don't want the head task to finish without haven't dealt with the depednent
///
///@param track the track to bring into the tasks AND tracklist for this queue
void ODWaveTrackTaskQueue::MergeWaveTrack(WaveTrack* track)
{
AddWaveTrack(track);
mTasksMutex.Lock();
for(unsigned int i=0;i<mTasks.size();i++)
{
mTasks[i]->AddWaveTrack(track);
mTasks[i]->SetNeedsODUpdate();
}
mTasksMutex.Unlock();
}
///returns true if the argument is in the WaveTrack list.
bool ODWaveTrackTaskQueue::ContainsWaveTrack(WaveTrack* track)
{
mTracksMutex.Lock();
for(unsigned int i=0;i<mTracks.size();i++)
{
if(mTracks[i]==track)
{
mTracksMutex.Unlock();
return true;
}
}
mTracksMutex.Unlock();
return false;
}
///Adds a track to the associated list.
void ODWaveTrackTaskQueue::AddWaveTrack(WaveTrack* track)
{
mTracksMutex.Lock();
if(track)
mTracks.push_back(track);
mTracksMutex.Unlock();
}
void ODWaveTrackTaskQueue::AddTask(ODTask* task)
{
mTasksMutex.Lock();
mTasks.push_back(task);
mTasksMutex.Unlock();
//take all of the tracks in the task.
mTracksMutex.Lock();
for(int i=0;i<task->GetNumWaveTracks();i++)
{
//task->GetWaveTrack(i) may return NULL, but we handle it by checking before using.
//The other worry that the WaveTrack returned and was deleted in the meantime is also
//handled since mQueuesMutex is locked one up in the stack from here,
//and WaveTrack deletion is bound to that.
mTracks.push_back(task->GetWaveTrack(i));
}
mTracksMutex.Unlock();
}
///Removes a track from the list. Also notifies mTasks to stop using references
///to the instance in a thread-safe manner (may block)
void ODWaveTrackTaskQueue::RemoveWaveTrack(WaveTrack* track)
{
if(track)
{
mTasksMutex.Lock();
for(unsigned int i=0;i<mTasks.size();i++)
mTasks[i]->StopUsingWaveTrack(track);
mTasksMutex.Unlock();
mTracksMutex.Lock();
for(unsigned int i=0;i<mTracks.size();i++)
if(mTracks[i]==track)
mTracks.erase(mTracks.begin()+i--);//decrement i after the removal.
mTracksMutex.Unlock();
}
}
//if the wavetrack is in this queue, and is not the only wavetrack, clones the tasks and schedules it.
void ODWaveTrackTaskQueue::MakeWaveTrackIndependent(WaveTrack* track)
{
mTracksMutex.Lock();
if(mTracks.size()<2)
{
//if there is only one track, it is already independent.
mTracksMutex.Unlock();
return;
}
for(unsigned int i=0;i<mTracks.size();i++)
{
if(mTracks[i]==track)
{
mTracksMutex.Unlock();//release the lock, since RemoveWaveTrack is a public threadsafe method.
RemoveWaveTrack(mTracks[i]);
//clone the items in order and add them to the ODManager.
mTasksMutex.Lock();
for(unsigned int j=0;j<mTasks.size();j++)
{
auto task = mTasks[j]->Clone();
task->AddWaveTrack(track);
//AddNewTask requires us to relinquish this lock. However, it is safe because ODManager::MakeWaveTrackIndependent
//has already locked the m_queuesMutex.
mTasksMutex.Unlock();
//AddNewTask locks the m_queuesMutex which is already locked by ODManager::MakeWaveTrackIndependent,
//so we pass a boolean flag telling it not to lock again.
ODManager::Instance()->AddNewTask(task.release(), false);
mTasksMutex.Lock();
}
mTasksMutex.Unlock();
mTracksMutex.Lock();
break;
}
}
mTracksMutex.Unlock();
}
///changes the tasks associated with this Waveform to process the task from a different point in the track
///@param track the track to update
///@param seconds the point in the track from which the tasks associated with track should begin processing from.
void ODWaveTrackTaskQueue::DemandTrackUpdate(WaveTrack* track, double seconds)
{
if(track)
{
mTracksMutex.Lock();
for(unsigned int i=0;i<mTasks.size();i++)
{
mTasks[i]->DemandTrackUpdate(track,seconds);
}
mTracksMutex.Unlock();
}
}
//Replaces all instances of a wavetracck with a NEW one (effectively transferes the task.)
void ODWaveTrackTaskQueue::ReplaceWaveTrack(WaveTrack* oldTrack, WaveTrack* newTrack)
{
if(oldTrack)
{
mTasksMutex.Lock();
for(unsigned int i=0;i<mTasks.size();i++)
mTasks[i]->ReplaceWaveTrack(oldTrack,newTrack);
mTasksMutex.Unlock();
mTracksMutex.Lock();
for(unsigned int i=0;i<mTracks.size();i++)
if(mTracks[i]==oldTrack)
mTracks[i]=newTrack;
mTracksMutex.Unlock();
}
}
//returns the wavetrack at position x.
WaveTrack* ODWaveTrackTaskQueue::GetWaveTrack(size_t x)
{
WaveTrack* ret = NULL;
mTracksMutex.Lock();
if (x < mTracks.size())
ret = mTracks[x];
mTracksMutex.Unlock();
return ret;
}
///returns the number of wavetracks in this queue.
int ODWaveTrackTaskQueue::GetNumWaveTracks()
{
int ret = 0;
mTracksMutex.Lock();
ret=mTracks.size();
mTracksMutex.Unlock();
return ret;
}
///returns the number of ODTasks in this queue
int ODWaveTrackTaskQueue::GetNumTasks()
{
int ret = 0;
mTasksMutex.Lock();
ret=mTasks.size();
mTasksMutex.Unlock();
return ret;
}
///returns a ODTask at position x
ODTask* ODWaveTrackTaskQueue::GetTask(size_t x)
{
ODTask* ret = NULL;
mTasksMutex.Lock();
if (x < mTasks.size())
ret = mTasks[x];
mTasksMutex.Unlock();
return ret;
}
//returns true if either tracks or tasks are empty
bool ODWaveTrackTaskQueue::IsEmpty()
{
bool isEmpty;
mTracksMutex.Lock();
isEmpty = mTracks.size()<=0;
mTracksMutex.Unlock();
mTasksMutex.Lock();
isEmpty = isEmpty || mTasks.size()<=0;
mTasksMutex.Unlock();
return isEmpty;
}
//returns true if the foremost task exists and is empty.
bool ODWaveTrackTaskQueue::IsFrontTaskComplete()
{
mTasksMutex.Lock();
if(mTasks.size())
{
//there is a chance the task got updated and now has more to do, (like when it is joined with a NEW track)
//check.
mTasks[0]->RecalculatePercentComplete();
bool ret;
ret = mTasks[0]->IsComplete();
mTasksMutex.Unlock();
return ret;
}
mTasksMutex.Unlock();
return false;
}
///Removes and deletes the front task from the list.
void ODWaveTrackTaskQueue::RemoveFrontTask()
{
mTasksMutex.Lock();
if(mTasks.size())
{
//wait for the task to stop running.
delete mTasks[0];
mTasks.erase(mTasks.begin());
}
mTasksMutex.Unlock();
}
///gets the front task for immediate execution
ODTask* ODWaveTrackTaskQueue::GetFrontTask()
{
mTasksMutex.Lock();
if(mTasks.size())
{
mTasksMutex.Unlock();
return mTasks[0];
}
mTasksMutex.Unlock();
return NULL;
}
///fills in the status bar message for a given track
void ODWaveTrackTaskQueue::FillTipForWaveTrack( WaveTrack * t, wxString &tip )
{
if(ContainsWaveTrack(t) && GetNumTasks())
{
// if(GetNumTasks()==1)
mTipMsg.Printf(_("%s %2.0f%% complete. Click to change task focal point."), GetFrontTask()->GetTip(), GetFrontTask()->PercentComplete()*100.0 );
// else
// msg.Printf(_("%s %d additional tasks remaining."), GetFrontTask()->GetTip().c_str(), GetNumTasks());
tip = mTipMsg.c_str();
}
}