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/* -*- Mode: C++; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
/* This Source Code Form is subject to the terms of the Mozilla Public
* License, v. 2.0. If a copy of the MPL was not distributed with this
* file, You can obtain one at http://mozilla.org/MPL/2.0/. */
#if !defined(MediaQueue_h_)
#define MediaQueue_h_
#include "mozilla/ReentrantMonitor.h"
#include "mozilla/TaskQueue.h"
#include "nsDeque.h"
#include "MediaEventSource.h"
namespace mozilla {
// Thread and type safe wrapper around nsDeque.
template <class T>
class MediaQueueDeallocator : public nsDequeFunctor {
virtual void* operator() (void* aObject) {
RefPtr<T> releaseMe = dont_AddRef(static_cast<T*>(aObject));
return nullptr;
}
};
template <class T>
class MediaQueue : private nsDeque {
public:
MediaQueue()
: nsDeque(new MediaQueueDeallocator<T>()),
mReentrantMonitor("mediaqueue"),
mEndOfStream(false)
{}
~MediaQueue() {
Reset();
}
inline size_t GetSize() const {
ReentrantMonitorAutoEnter mon(mReentrantMonitor);
return nsDeque::GetSize();
}
inline void Push(T* aItem) {
ReentrantMonitorAutoEnter mon(mReentrantMonitor);
MOZ_ASSERT(aItem);
NS_ADDREF(aItem);
MOZ_ASSERT(aItem->GetEndTime() >= aItem->mTime);
nsDeque::Push(aItem);
mPushEvent.Notify(RefPtr<T>(aItem));
}
inline void PushFront(T* aItem) {
ReentrantMonitorAutoEnter mon(mReentrantMonitor);
MOZ_ASSERT(aItem);
NS_ADDREF(aItem);
nsDeque::PushFront(aItem);
}
inline already_AddRefed<T> PopFront() {
ReentrantMonitorAutoEnter mon(mReentrantMonitor);
RefPtr<T> rv = dont_AddRef(static_cast<T*>(nsDeque::PopFront()));
if (rv) {
mPopEvent.Notify(rv);
}
return rv.forget();
}
inline RefPtr<T> Peek() const {
ReentrantMonitorAutoEnter mon(mReentrantMonitor);
return static_cast<T*>(nsDeque::Peek());
}
inline RefPtr<T> PeekFront() const {
ReentrantMonitorAutoEnter mon(mReentrantMonitor);
return static_cast<T*>(nsDeque::PeekFront());
}
void Reset() {
ReentrantMonitorAutoEnter mon(mReentrantMonitor);
while (GetSize() > 0) {
RefPtr<T> x = dont_AddRef(static_cast<T*>(nsDeque::PopFront()));
}
mEndOfStream = false;
}
bool AtEndOfStream() const {
ReentrantMonitorAutoEnter mon(mReentrantMonitor);
return GetSize() == 0 && mEndOfStream;
}
// Returns true if the media queue has had its last item added to it.
// This happens when the media stream has been completely decoded. Note this
// does not mean that the corresponding stream has finished playback.
bool IsFinished() const {
ReentrantMonitorAutoEnter mon(mReentrantMonitor);
return mEndOfStream;
}
// Informs the media queue that it won't be receiving any more items.
void Finish() {
ReentrantMonitorAutoEnter mon(mReentrantMonitor);
mEndOfStream = true;
mFinishEvent.Notify();
}
// Returns the approximate number of microseconds of items in the queue.
int64_t Duration() {
ReentrantMonitorAutoEnter mon(mReentrantMonitor);
if (GetSize() == 0) {
return 0;
}
T* last = static_cast<T*>(nsDeque::Peek());
T* first = static_cast<T*>(nsDeque::PeekFront());
return last->GetEndTime() - first->mTime;
}
void LockedForEach(nsDequeFunctor& aFunctor) const {
ReentrantMonitorAutoEnter mon(mReentrantMonitor);
ForEach(aFunctor);
}
// Extracts elements from the queue into aResult, in order.
// Elements whose start time is before aTime are ignored.
void GetElementsAfter(int64_t aTime, nsTArray<RefPtr<T>>* aResult) {
ReentrantMonitorAutoEnter mon(mReentrantMonitor);
if (GetSize() == 0)
return;
size_t i;
for (i = GetSize() - 1; i > 0; --i) {
T* v = static_cast<T*>(ObjectAt(i));
if (v->GetEndTime() < aTime)
break;
}
// Elements less than i have a end time before aTime. It's also possible
// that the element at i has a end time before aTime, but that's OK.
for (; i < GetSize(); ++i) {
RefPtr<T> elem = static_cast<T*>(ObjectAt(static_cast<size_t>(i)));
aResult->AppendElement(elem);
}
}
void GetFirstElements(uint32_t aMaxElements, nsTArray<RefPtr<T>>* aResult) {
ReentrantMonitorAutoEnter mon(mReentrantMonitor);
for (size_t i = 0; i < aMaxElements && i < GetSize(); ++i) {
*aResult->AppendElement() = static_cast<T*>(ObjectAt(i));
}
}
uint32_t FrameCount() {
ReentrantMonitorAutoEnter mon(mReentrantMonitor);
uint32_t frames = 0;
for (size_t i = 0; i < GetSize(); ++i) {
T* v = static_cast<T*>(ObjectAt(i));
frames += v->mFrames;
}
return frames;
}
MediaEventSource<RefPtr<T>>& PopEvent() {
return mPopEvent;
}
MediaEventSource<RefPtr<T>>& PushEvent() {
return mPushEvent;
}
MediaEventSource<void>& FinishEvent() {
return mFinishEvent;
}
private:
mutable ReentrantMonitor mReentrantMonitor;
MediaEventProducer<RefPtr<T>> mPopEvent;
MediaEventProducer<RefPtr<T>> mPushEvent;
MediaEventProducer<void> mFinishEvent;
// True when we've decoded the last frame of data in the
// bitstream for which we're queueing frame data.
bool mEndOfStream;
};
} // namespace mozilla
#endif
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