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/*
* Copyright (C) 2013 Google Inc. All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions are
* met:
*
* * Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* * Redistributions in binary form must reproduce the above
* copyright notice, this list of conditions and the following disclaimer
* in the documentation and/or other materials provided with the
* distribution.
* * Neither the name of Google Inc. nor the names of its
* contributors may be used to endorse or promote products derived from
* this software without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
* "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
* LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
* A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
* OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
* SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
* LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
* DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
* THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
* OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
*/
#ifndef THIRD_PARTY_BLINK_RENDERER_MODULES_MEDIASOURCE_SOURCE_BUFFER_LIST_H_
#define THIRD_PARTY_BLINK_RENDERER_MODULES_MEDIASOURCE_SOURCE_BUFFER_LIST_H_
#include "third_party/blink/renderer/core/execution_context/execution_context.h"
#include "third_party/blink/renderer/core/execution_context/execution_context_lifecycle_observer.h"
#include "third_party/blink/renderer/modules/event_target_modules.h"
#include "third_party/blink/renderer/platform/heap/garbage_collected.h"
namespace blink {
class EventQueue;
class SourceBuffer;
class SourceBufferList final : public EventTarget,
public ExecutionContextClient {
DEFINE_WRAPPERTYPEINFO();
public:
SourceBufferList(ExecutionContext*, EventQueue*);
~SourceBufferList() override;
unsigned length() const { return list_.size(); }
DEFINE_ATTRIBUTE_EVENT_LISTENER(addsourcebuffer, kAddsourcebuffer)
DEFINE_ATTRIBUTE_EVENT_LISTENER(removesourcebuffer, kRemovesourcebuffer)
SourceBuffer* item(unsigned index) const {
return (index < list_.size()) ? list_[index].Get() : nullptr;
}
void Add(SourceBuffer*);
void insert(wtf_size_t position, SourceBuffer*);
void Remove(SourceBuffer*);
wtf_size_t Find(SourceBuffer* buffer) { return list_.Find(buffer); }
bool Contains(SourceBuffer* buffer) {
return list_.Find(buffer) != kNotFound;
}
void Clear();
// EventTarget interface
const AtomicString& InterfaceName() const override;
ExecutionContext* GetExecutionContext() const override {
return ExecutionContextClient::GetExecutionContext();
}
void Trace(Visitor*) const override;
private:
void ScheduleEvent(const AtomicString&);
Member<EventQueue> async_event_queue_;
// If any portion of an attached HTMLMediaElement (HTMLME) and the MediaSource
// Extensions (MSE) API is alive (having pending activity or traceable from a
// GC root), the whole group is not GC'ed. Here, using Member,
// instead of Member, because the |list_|'s SourceBuffers' wrappers need to
// remain alive at least to successfully dispatch any events enqueued by
// behavior of the HTMLME+MSE API. Member usage here keeps the
// SourceBuffers in |list_|, and their wrappers, from being collected if we
// are alive or traceable from a GC root.
// For instance, suppose the only reference to the group of HTMLME+MSE API
// objects is one held by the app to the wrapper of this SourceBufferList.
// The app could do any of a number of actions on any of the SourceBuffers in
// |list_|, such as appending more media, causing events to be enqueued for
// later dispatch on at least those SourceBuffers. None of the app's event
// listeners on objects in HTMLME+MSE are counted as references, but events
// pending for dispatch to them must keep the HTML+MSE group of objects alive
// through at least their dispatch.
HeapVector<Member<SourceBuffer>> list_;
};
} // namespace blink
#endif // THIRD_PARTY_BLINK_RENDERER_MODULES_MEDIASOURCE_SOURCE_BUFFER_LIST_H_
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