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Diffstat (limited to 'media/libstagefright/include/TimedEventQueue.h')
-rw-r--r-- | media/libstagefright/include/TimedEventQueue.h | 106 |
1 files changed, 106 insertions, 0 deletions
diff --git a/media/libstagefright/include/TimedEventQueue.h b/media/libstagefright/include/TimedEventQueue.h new file mode 100644 index 0000000..a264421 --- /dev/null +++ b/media/libstagefright/include/TimedEventQueue.h @@ -0,0 +1,106 @@ +/* + * Copyright (C) 2009 The Android Open Source Project + * + * Licensed under the Apache License, Version 2.0 (the "License"); + * you may not use this file except in compliance with the License. + * You may obtain a copy of the License at + * + * http://www.apache.org/licenses/LICENSE-2.0 + * + * Unless required by applicable law or agreed to in writing, software + * distributed under the License is distributed on an "AS IS" BASIS, + * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. + * See the License for the specific language governing permissions and + * limitations under the License. + */ + +#ifndef TIMED_EVENT_QUEUE_H_ + +#define TIMED_EVENT_QUEUE_H_ + +#include <pthread.h> + +#include <utils/List.h> +#include <utils/RefBase.h> +#include <utils/threads.h> + +namespace android { + +struct TimedEventQueue { + + struct Event : public RefBase { + Event() {} + virtual ~Event() {} + + protected: + virtual void fire(TimedEventQueue *queue, int64_t now_us) = 0; + + private: + friend class TimedEventQueue; + + Event(const Event &); + Event &operator=(const Event &); + }; + + TimedEventQueue(); + ~TimedEventQueue(); + + // Start executing the event loop. + void start(); + + // Stop executing the event loop, if flush is false, any pending + // events are discarded, otherwise the queue will stop (and this call + // return) once all pending events have been handled. + void stop(bool flush = false); + + // Posts an event to the front of the queue (after all events that + // have previously been posted to the front but before timed events). + void postEvent(const sp<Event> &event); + + void postEventToBack(const sp<Event> &event); + + // It is an error to post an event with a negative delay. + void postEventWithDelay(const sp<Event> &event, int64_t delay_us); + + // If the event is to be posted at a time that has already passed, + // it will fire as soon as possible. + void postTimedEvent(const sp<Event> &event, int64_t realtime_us); + + // Returns true iff event is currently in the queue and has been + // successfully cancelled. In this case the event will have been + // removed from the queue and won't fire. + bool cancelEvent(const sp<Event> &event); + + static int64_t getRealTimeUs(); + +private: + struct QueueItem { + sp<Event> event; + int64_t realtime_us; + }; + + struct StopEvent : public TimedEventQueue::Event { + virtual void fire(TimedEventQueue *queue, int64_t now_us) { + queue->mStopped = true; + } + }; + + pthread_t mThread; + List<QueueItem> mQueue; + Mutex mLock; + Condition mQueueNotEmptyCondition; + Condition mQueueHeadChangedCondition; + + bool mRunning; + bool mStopped; + + static void *ThreadWrapper(void *me); + void threadEntry(); + + TimedEventQueue(const TimedEventQueue &); + TimedEventQueue &operator=(const TimedEventQueue &); +}; + +} // namespace android + +#endif // TIMED_EVENT_QUEUE_H_ |