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// Copyright 2014 The Chromium Authors
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.
#include "third_party/blink/renderer/modules/mediasource/track_default_list.h"
#include "third_party/blink/renderer/platform/bindings/exception_state.h"
#include "third_party/blink/renderer/platform/heap/collection_support/heap_hash_map.h"
#include "third_party/blink/renderer/platform/wtf/text/atomic_string_hash.h"
#include "third_party/blink/renderer/platform/wtf/text/string_hash.h"
namespace blink {
TrackDefaultList* TrackDefaultList::Create(
const HeapVector<Member<TrackDefault>>& track_defaults,
ExceptionState& exception_state) {
// 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<V8TrackDefaultType::Enum, String>;
using TypeAndIDToTrackDefaultMap =
HeapHashMap<TypeAndID, Member<TrackDefault>>;
TypeAndIDToTrackDefaultMap type_and_id_to_track_default_map;
for (const auto& track_default : track_defaults) {
TypeAndID key = TypeAndID(track_default->type().AsEnum(),
track_default->byteStreamTrackID());
if (!type_and_id_to_track_default_map.insert(key, track_default)
.is_new_entry) {
exception_state.ThrowDOMException(
DOMExceptionCode::kInvalidAccessError,
"Duplicate TrackDefault type (" +
V8TrackDefaultType(key.first).AsString() +
") 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 MakeGarbageCollected<TrackDefaultList>(track_defaults);
}
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 >= track_defaults_.size())
return nullptr;
// 2. Return the |index|'th TrackDefault object in the list.
return track_defaults_[index].Get();
}
TrackDefaultList::TrackDefaultList(
const HeapVector<Member<TrackDefault>>& track_defaults)
: track_defaults_(track_defaults) {}
void TrackDefaultList::Trace(Visitor* visitor) const {
visitor->Trace(track_defaults_);
ScriptWrappable::Trace(visitor);
}
} // namespace blink
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