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;
}
}
F32 max_priority = -1.f;
LLAudioSource *max_sourcep = NULL; // Maximum priority source without a channel
source_map::iterator iter;
for (iter = mAllSources.begin(); iter != mAllSources.end();)
{
LLAudioSource *sourcep = iter->second;
// Update this source
sourcep->update();
sourcep->updatePriority();
if (sourcep->isDone())
{
// The source is done playing, clean it up.
delete sourcep;
mAllSources.erase(iter++);
continue;
}
if (sourcep->isMuted())
{
++iter;
continue;
}
if (!sourcep->getChannel() && sourcep->getCurrentBuffer())
{
// We could potentially play this sound if its priority is high enough.
if (sourcep->getPriority() > max_priority)
{
max_priority = sourcep->getPriority();
max_sourcep = sourcep;
}
}
// Move on to the next source
iter++;
}
// Now, do priority-based organization of audio sources.
// All channels used, check priorities.
// Find channel with lowest priority
if (max_sourcep)
{
LLAudioChannel *channelp = getFreeChannel(max_priority);
if (channelp)
{
//llinfos << "Replacing source in channel due to priority!" << llendl;
max_sourcep->setChannel(channelp);
channelp->setSource(max_sourcep);
if (max_sourcep->isSyncSlave())
{
// A sync slave, it doesn't start playing until it's synced up with the master.
// Flag this channel as waiting for sync, and return true.
channelp->setWaiting(true);
}
else
{
channelp->setWaiting(false);
channelp->play();
}
}
}
// Do this BEFORE we update the channels
// Update the channels to sync up with any changes that the source made,
// such as changing what sound was playing.
updateChannels();
// Update queued sounds (switch to next queued data if the current has finished playing)
for (iter = mAllSources.begin(); iter != mAllSources.end(); ++iter)
{
// This is lame, instead of this I could actually iterate through all the sources
// attached to each channel, since only those with active channels
// can have anything interesting happen with their queue? (Maybe not true)
LLAudioSource *sourcep = iter->second;
if (!sourcep->mQueuedDatap || sourcep->isMuted())
{
// Muted, or nothing queued, so we don't care.
continue;
}
LLAudioChannel *channelp = sourcep->getChannel();
if (!channelp)
{
// This sound isn't playing, so we just process move the queue
sourcep->mCurrentDatap = sourcep->mQueuedDatap;
sourcep->mQueuedDatap = NULL;
// Reset the timer so the source doesn't die.
sourcep->mAgeTimer.reset();
// Make sure we have the buffer set up if we just decoded the data
if (sourcep->mCurrentDatap)
{
updateBufferForData(sourcep->mCurrentDatap);
}
// Actually play the associated data.
sourcep->setupChannel();
channelp = sourcep->getChannel();
if (channelp)
{
channelp->updateBuffer();
sourcep->getChannel()->play();
}
continue;
}
else
{
// Check to see if the current sound is done playing, or looped.
if (!channelp->isPlaying())
{
sourcep->mCurrentDatap = sourcep->mQueuedDatap;
sourcep->mQueuedDatap = NULL;
// Reset the timer so the source doesn't die.
sourcep->mAgeTimer.reset();
// Make sure we have the buffer set up if we just decoded the data
if (sourcep->mCurrentDatap)
{
updateBufferForData(sourcep->mCurrentDatap);
}
// Actually play the associated data.
sourcep->setupChannel();
channelp->updateBuffer();
sourcep->getChannel()->play();
}
else if (sourcep->isLoop())
{
// It's a loop, we need to check and see if we're done with it.
if (channelp->mLoopedThisFrame)
{
sourcep->mCurrentDatap = sourcep->mQueuedDatap;
sourcep->mQueuedDatap = NULL;
// Actually, should do a time sync so if we're a loop master/slave
// we don't drift away.
sourcep->setupChannel();
sourcep->getChannel()->play();
}
}
}
}
// Lame, update the channels AGAIN.
// Update the channels to sync up with any changes that the source made,
// such as changing what sound was playing.
updateChannels();
// Hack! For now, just use a global sync master;
LLAudioSource *sync_masterp = NULL;
LLAudioChannel *master_channelp = NULL;
F32 max_sm_priority = -1.f;
for (iter = mAllSources.begin(); iter != mAllSources.end(); ++iter)
{
LLAudioSource *sourcep = iter->second;
if (sourcep->isMuted())
{
continue;
}
if (sourcep->isSyncMaster())
{
if (sourcep->getPriority() > max_sm_priority)
{
sync_masterp = sourcep;
master_channelp = sync_masterp->getChannel();
max_sm_priority = sourcep->getPriority();
}
}
}
if (master_channelp && master_channelp->mLoopedThisFrame)
{
// Synchronize loop slaves with their masters
// Update queued sounds (switch to next queued data if the current has finished playing)
for (iter = mAllSources.begin(); iter != mAllSources.end(); ++iter)
{
LLAudioSource *sourcep = iter->second;
if (!sourcep->isSyncSlave())
{
// Not a loop slave, we don't need to do anything
continue;
}
LLAudioChannel *channelp = sourcep->getChannel();
if (!channelp)
{
// Not playing, don't need to bother.
continue;
}
if (!channelp->isPlaying())
{
// Now we need to check if our loop master has just looped, and
// start playback if that's the case.
if (sync_masterp->getChannel())
{
channelp->playSynced(master_channelp);
channelp->setWaiting(false);
}
}
}
}
// Sync up everything that the audio engine needs done.
commitDeferredChanges();
// Flush unused buffers that are stale enough
for (i = 0; i < MAX_BUFFERS; i++)
{
if (mBuffers[i])
{
if (!mBuffers[i]->mInUse && mBuffers[i]->mLastUseTimer.getElapsedTimeF32() > 30.f)
{
//llinfos << "Flushing unused buffer!" << llendl;
mBuffers[i]->mAudioDatap->mBufferp = NULL;
delete mBuffers[i];
mBuffers[i] = NULL;
}
}
}
// Clear all of the looped flags for the channels
for (i = 0; i < MAX_CHANNELS; i++)
{
if (mChannels[i])
{
mChannels[i]->mLoopedThisFrame = false;
}
}
// Decode audio files
gAudioDecodeMgrp->processQueue(max_decode_time);
// Call this every frame, just in case we somehow
// missed picking it up in all the places that can add
// or request new data.
startNextTransfer();
updateInternetStream();
}
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;
}
if(sourcep->getChannel())
{
//If this is just a regular sound and is currently playing then do nothing special.
continue;
}
//Add to our queue. Highest priority will be at the front.
queue.push(sourcep);
}
// Do this BEFORE we update the channels
// Update the channels to sync up with any changes that the source made,
// such as changing what sound was playing.
updateChannels();
//Loop over all syncsaves. If no syncmaster, stop looping ones, else add ones that need [re]started to the priority queue.
//Normally there are zero to one syncslaves, so this loop isn't typically expensive.
for(std::vector<LLAudioSource*>::iterator iter=slave_list.begin();iter!=slave_list.end();++iter)
{
if(!sync_masterp)
{
//Stop any looping syncslaves. I'm not sure this behavior is correct, but letting looping syncslaves run
//off on their own seems wrong. The lsl documentation is unclear.
if((*iter)->getChannel() && (*iter)->isLoop())
{
(*iter)->getChannel()->cleanup();
}
}
//If the syncmaster already has a channel and hasn't looped, then we can skip syncslaves this idle tick (there's nothing to do).
else if((!sync_masterp->getChannel() || sync_masterp->getChannel()->mLoopedThisFrame))
{
//Add syncslaves that we might want to [re]start.
if(!(*iter)->getChannel() || (*iter)->isLoop())
queue.push((*iter));
}
}
if(sync_masterp)
{
//Syncmaster must have priority greater than or equal to priority of highest priority syncslave.
//The case of slave priority equaling master priority is handled in the comparator (SourcePriorityComparator).
if(sync_slavep)
sync_masterp->setPriority(sync_slavep->getPriority());
if(!sync_masterp->getChannel())
{
queue.push(sync_masterp);
}
}
// Dispatch all soundsources.
bool syncmaster_started = sync_masterp && sync_masterp->getChannel() && sync_masterp->getChannel()->mLoopedThisFrame;
while(!queue.empty())
{
LLAudioSource *sourcep = queue.top();
queue.pop();
//If the syncmaster hasn't just started playing, or hasn't just looped then skip this soundslave,
//as there's nothing to do with it yet.
if (sourcep->isSyncSlave() && !syncmaster_started)
{
continue;
}
LLAudioChannel *channelp = sourcep->getChannel();
if (!channelp)
{
//No more channels. We can break here, as in theory, any lower priority sounds should have had their
//channel already stolen. There should be nothing playing, nor playable, when iterating beyond this point.
if(!(channelp = getFreeChannel(sourcep->getPriority())))
{
break;
}
//If this is the primary syncmaster that we just started, then [re]start syncslaves further down in the priority queue.
//Due to sorting and priority fudgery, the syncmaster is ALWAYS before any syncslaves in this loop.
syncmaster_started |= (sourcep == sync_masterp);
//setSource calls updateBuffer and update3DPosition, and resets the source mAgeTimer
channelp->setSource(sourcep);
}
if(sourcep->isSyncSlave())
channelp->playSynced(sync_masterp->getChannel());
else
channelp->play();
}
// Sync up everything that the audio engine needs done.
commitDeferredChanges();
// Flush unused buffers that are stale enough
for (i = 0; i < MAX_BUFFERS; i++)
{
if (mBuffers[i])
{
if (!mBuffers[i]->mInUse && mBuffers[i]->mLastUseTimer.getElapsedTimeF32() > 30.f)
{
LL_DEBUGS("AudioEngine") << "Flushing unused buffer!" << LL_ENDL;
mBuffers[i]->mAudioDatap->mBufferp = NULL;
delete mBuffers[i];
mBuffers[i] = NULL;
}
}
}
// Clear all of the looped flags for the channels
for (i = 0; i < MAX_CHANNELS; i++)
{
if (mChannels[i])
{
mChannels[i]->mLoopedThisFrame = false;
}
}
// Decode audio files
gAudioDecodeMgrp->processQueue(max_decode_time);
// Just call here every frame. It makes little sense to call elsewhere,
// as it's throttled to one active preloading loading sound at a time anyhow
startNextTransfer();
updateInternetStream();
}