C++ LLAudioData类代码示例

void LLAudioEngine::startNextTransfer()
{
	//LL_INFOS("AudioEngine") << "LLAudioEngine::startNextTransfer()" << LL_ENDL;
	if (getMuted())
	{
		return;
	}
	else if(mCurrentTransferTimer.getElapsedTimeF32() <= .1f)
	{
		return;
	}
	else if(mCurrentTransfer && mCurrentTransfer->isInPreload())
	{
		//Keep updating until it either errors out or completes.
		mCurrentTransfer->updateLoadState();	
		return;
	}
	else
	{
		mCurrentTransfer = NULL;
	}

	//Technically, mCurrentTransfer could end up pointing to an audiodata object that's already
	//being transmitted/decoded if such was spawned via needing it for playback immediately.
	//This will effectively block us from choosing a lower priority audiodata object until the
	//immediate ones are done, but it's not a real problem.

	// Get the ID for the next asset that we want to transfer.
	// Pick one in the following order:
	S32 i;
	LLAudioSource *asp = NULL;
	LLAudioData *adp = NULL;
	LLAudioData *cur_adp = NULL;
	data_map::iterator data_iter;

	// Check all channels for currently playing sounds.
	F32 max_pri = -1.f;
	for (i = 0; i < MAX_CHANNELS; i++)
	{
		if (!mChannels[i])
		{
			continue;
		}

		asp = mChannels[i]->getSource();
		if (!asp)
		{
			continue;
		}
		if (asp->getPriority() <= max_pri)
		{
			continue;
		}

		if (asp->getPriority() <= max_pri)
		{
			continue;
		}

		adp = asp->getCurrentData();
		if (!adp)
		{
			continue;
		}

		if (adp->isInPreload())
		{
			max_pri = asp->getPriority();
			cur_adp = adp;
		}
	}

	// Check all channels for currently queued sounds.
	if (!cur_adp)
	{
		max_pri = -1.f;
		for (i = 0; i < MAX_CHANNELS; i++)
		{
			if (!mChannels[i])
			{
				continue;
			}

			LLAudioSource *asp;
			asp = mChannels[i]->getSource();
			if (!asp)
			{
				continue;
			}

			if (asp->getPriority() <= max_pri)
			{
				continue;
			}

			adp = asp->getQueuedData();
			if (!adp)
			{
				continue;
			}
//.........这里部分代码省略.........

void LLAudioEngine::idle(F32 max_decode_time)
{
	if (max_decode_time <= 0.f)
	{
		max_decode_time = default_max_decode_time;
	}
	
	// "Update" all of our audio sources, clean up dead ones.
	// Primarily does position updating, cleanup of unused audio sources.
	// Also does regeneration of the current priority of each audio source.

	S32 i;
	for (i = 0; i < MAX_BUFFERS; i++)
	{
		if (mBuffers[i])
		{
			mBuffers[i]->mInUse = false;
		}
	}

	//Iterate down all queued sources. Remove finished ones, sort active ones by priority. Find highest priority 'master' source if present.
	LLAudioSource *sync_masterp = NULL;	//Highest priority syncmaster
	LLAudioSource *sync_slavep = NULL;	//Highest priority syncslave

	//Priority queue that will be filled with soundsources that have a high likeleyhood of being able to start [re]playing this idle tick.
	//Sort order:  Primary: priority. Secondary: syncmaster. Tertiary: syncslave
	std::priority_queue<LLAudioSource*,std::vector<LLAudioSource*,boost::pool_allocator<LLAudioSource*> >,SourcePriorityComparator> queue;

	//Have to put syncslaves into a temporary list until the syncmaster state is determined.
	//If the syncmaster might be started, or just looped, insert all pending/looping syncslaves into the priority queue.
	//If the there is no active syncmaster, then stop any currently looping syncslaves and add none to the priority queue.
	//This is necessary as any looping soundsources to be stopped, MUST be stopped before iterating down the priority queue.
	static std::vector<LLAudioSource*> slave_list;	
	slave_list.clear();

	//Iterate over all sources. Update their decode or 'done' state, as well as their priorities.
	//Also add sources that might be able to start playing to the priority queue.
	//Only sources without channels should be added to priority queue.
	//Syncslaves must put into the slave list instead of the priority queue.
	for (source_map::iterator iter = mAllSources.begin(); iter != mAllSources.end();)
	{
		LLAudioSource *sourcep = iter->second;

		//Load/decode/queue pop
		sourcep->update();

		//Done after update, as failure to load might mark source as corrupt, which causes isDone to return true.
		if (sourcep->isDone())		
		{
			// The source is done playing, clean it up.
			delete sourcep;
			mAllSources.erase(iter++);
			continue;
		}

		// Increment iter here (it is not used anymore), so we can use continue below to move on to the next source.
		++iter;

		if(!sourcep->isLoop() && sourcep->mPlayedOnce && (!sourcep->mChannelp || !sourcep->mChannelp->isPlaying()))
		{
			continue;
		}

		LLAudioData *adp = sourcep->getCurrentData();
		//If there is no current data at all, or if it hasn't loaded, we must skip this source.
		if (!adp || !adp->getBuffer())
		{
			continue;
		}

		sourcep->updatePriority();	//Calculates current priority. 1.f=ambient. 0.f=muted. Otherwise based off of distance.

		if (sourcep->getPriority() < F_APPROXIMATELY_ZERO)
		{
			// Muted, or nothing queued, or too far, so we don't care.
			continue;
		}
		else if(sourcep->isSyncMaster())
		{
			if(!sync_masterp || sourcep->getPriority() > sync_masterp->getPriority())
			{
				if(sync_masterp && !sync_masterp->getChannel())
					queue.push(sync_masterp);	//Add lower-priority soundmaster to the queue as a normal sound.	
				sync_masterp = sourcep;
				//Don't add master to the queue yet.
				//Add it after highest-priority sound slave is found so we can outrank its priority.
				continue;	
			}
			//Else fall through like a normal sound.
		}
		else if(sourcep->isSyncSlave())
		{
			if(!sync_slavep || sourcep->getPriority() > sync_slavep->getPriority())
			{
				sync_slavep = sourcep;
			}
			//Don't add to the priority queue quite yet. Best primary syncmaster candidate may not have been determined yet.
			slave_list.push_back(sourcep);
			continue;
		}
//.........这里部分代码省略.........

void LLAudioEngine::startNextTransfer()
{
	//llinfos << "LLAudioEngine::startNextTransfer()" << llendl;
	if (mCurrentTransfer.notNull() || getMuted())
	{
		//llinfos << "Transfer in progress, aborting" << llendl;
		return;
	}

	// Get the ID for the next asset that we want to transfer.
	// Pick one in the following order:
	LLUUID asset_id;
	S32 i;
	LLAudioSource *asp = NULL;
	LLAudioData *adp = NULL;
	data_map::iterator data_iter;

	// Check all channels for currently playing sounds.
	F32 max_pri = -1.f;
	for (i = 0; i < MAX_CHANNELS; i++)
	{
		if (!mChannels[i])
		{
			continue;
		}

		asp = mChannels[i]->getSource();
		if (!asp)
		{
			continue;
		}
		if (asp->getPriority() <= max_pri)
		{
			continue;
		}

		if (asp->getPriority() <= max_pri)
		{
			continue;
		}

		adp = asp->getCurrentData();
		if (!adp)
		{
			continue;
		}

		if (!adp->hasLocalData() && adp->hasValidData())
		{
			asset_id = adp->getID();
			max_pri = asp->getPriority();
		}
	}

	// Check all channels for currently queued sounds.
	if (asset_id.isNull())
	{
		max_pri = -1.f;
		for (i = 0; i < MAX_CHANNELS; i++)
		{
			if (!mChannels[i])
			{
				continue;
			}

			LLAudioSource *asp;
			asp = mChannels[i]->getSource();
			if (!asp)
			{
				continue;
			}

			if (asp->getPriority() <= max_pri)
			{
				continue;
			}

			adp = asp->getQueuedData();
			if (!adp)
			{
				continue;
			}

			if (!adp->hasLocalData() && adp->hasValidData())
			{
				asset_id = adp->getID();
				max_pri = asp->getPriority();
			}
		}
	}

	// Check all live channels for other sounds (preloads).
	if (asset_id.isNull())
	{
		max_pri = -1.f;
		for (i = 0; i < MAX_CHANNELS; i++)
		{
			if (!mChannels[i])
			{
				continue;
//.........这里部分代码省略.........