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// Copyright 2014 The Chromium Authors. All rights reserved.
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.
#include "config.h"
#include "modules/mediasource/TrackDefaultList.h"
#include "bindings/core/v8/ExceptionState.h"
#include "core/dom/ExceptionCode.h"
#include "wtf/text/AtomicStringHash.h"
#include "wtf/text/StringHash.h"
namespace blink {
TrackDefaultList* TrackDefaultList::create()
{
return new TrackDefaultList();
}
TrackDefaultList* TrackDefaultList::create(const HeapVector<Member<TrackDefault>>& trackDefaults, ExceptionState& exceptionState)
{
// Per 11 Dec 2014 Editor's Draft
// https://w3c.github.io/media-source/#trackdefaultlist
// When this method is invoked, the user agent must run the following steps:
// 1. If |trackDefaults| contains two or more TrackDefault objects with the
// same type and the same byteStreamTrackID, then throw an
// InvalidAccessError and abort these steps.
// Note: This also applies when byteStreamTrackID contains an empty
// string and ensures that there is only one "byteStreamTrackID
// independent" default for each TrackDefaultType value.
using TypeAndID = std::pair<AtomicString, String>;
using TypeAndIDToTrackDefaultMap = HeapHashMap<TypeAndID, Member<TrackDefault>>;
TypeAndIDToTrackDefaultMap typeAndIDToTrackDefaultMap;
for (const auto& trackDefault : trackDefaults) {
TypeAndID key = TypeAndID(trackDefault->type(), trackDefault->byteStreamTrackID());
if (!typeAndIDToTrackDefaultMap.add(key, trackDefault).isNewEntry) {
exceptionState.throwDOMException(InvalidAccessError, "Duplicate TrackDefault type (" + key.first + ") and byteStreamTrackID (" + key.second + ")");
return nullptr;
}
}
// 2. Store a shallow copy of |trackDefaults| in this new object so the values can
// be returned by the accessor methods.
// This step is done in constructor initializer.
return new TrackDefaultList(trackDefaults);
}
TrackDefault* TrackDefaultList::item(unsigned index) const
{
// Per 11 Dec 2014 Editor's Draft
// https://w3c.github.io/media-source/#trackdefaultlist
// When this method is invoked, the user agent must run the following steps:
// 1. If |index| is greater than or equal to the length attribute then
// return undefined and abort these steps.
if (index >= m_trackDefaults.size())
return 0;
// 2. Return the |index|'th TrackDefault object in the list.
return m_trackDefaults[index].get();
}
TrackDefaultList::TrackDefaultList()
{
}
TrackDefaultList::TrackDefaultList(const HeapVector<Member<TrackDefault>>& trackDefaults)
: m_trackDefaults(trackDefaults)
{
}
void TrackDefaultList::trace(Visitor* visitor)
{
visitor->trace(m_trackDefaults);
}
} // namespace blink
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