/*
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* Copyright (C) 2010 The Android Open Source Project
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*
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* Licensed under the Apache License, Version 2.0 (the "License");
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* you may not use this file except in compliance with the License.
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* You may obtain a copy of the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS,
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* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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* See the License for the specific language governing permissions and
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* limitations under the License.
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*/
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/* sync */
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#include "sles_allinclusive.h"
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/** \brief Sync thread.
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* The sync thread runs periodically to synchronize audio state between
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* the application and platform-specific device driver; for best results
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* it should run about every graphics frame (e.g. 20 Hz to 50 Hz).
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*/
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void *sync_start(void *arg)
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{
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CEngine *thiz = (CEngine *) arg;
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for (;;) {
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// FIXME should be driven by cond_signal rather than polling,
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// or at least make the poll interval longer or configurable
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usleep(20000*5);
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object_lock_exclusive(&thiz->mObject);
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if (thiz->mEngine.mShutdown) {
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thiz->mEngine.mShutdownAck = SL_BOOLEAN_TRUE;
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// broadcast not signal, because this condition is also used for other purposes
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object_cond_broadcast(&thiz->mObject);
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object_unlock_exclusive(&thiz->mObject);
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break;
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}
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if (thiz->m3DCommit.mWaiting) {
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thiz->m3DCommit.mWaiting = 0;
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++thiz->m3DCommit.mGeneration;
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// There might be more than one thread blocked in Commit, so wake them all
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object_cond_broadcast(&thiz->mObject);
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// here is where we would process the enqueued 3D commands
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}
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// unsigned instanceMask = thiz->mEngine.mInstanceMask; // for debugger
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unsigned changedMask = thiz->mEngine.mChangedMask;
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thiz->mEngine.mChangedMask = 0;
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object_unlock_exclusive(&thiz->mObject);
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// now we know which objects exist, and which of those have changes
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unsigned combinedMask = changedMask /* | instanceMask for debugger */;
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while (combinedMask) {
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unsigned i = ctz(combinedMask);
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assert(MAX_INSTANCE > i);
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combinedMask &= ~(1 << i);
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IObject *instance = (IObject *) thiz->mEngine.mInstances[i];
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// Could be NULL during construct or destroy
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if (NULL == instance) {
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continue;
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}
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object_lock_exclusive(instance);
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unsigned attributesMask = instance->mAttributesMask;
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instance->mAttributesMask = 0;
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switch (IObjectToObjectID(instance)) {
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case SL_OBJECTID_AUDIOPLAYER:
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// do something here
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object_unlock_exclusive(instance);
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#ifdef USE_SNDFILE
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if (attributesMask & (ATTR_POSITION | ATTR_TRANSPORT)) {
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CAudioPlayer *audioPlayer = (CAudioPlayer *) instance;
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audioPlayerTransportUpdate(audioPlayer);
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}
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#endif
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break;
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default:
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object_unlock_exclusive(instance);
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break;
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}
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}
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}
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return NULL;
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}
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