| // 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 "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/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<AtomicString, 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(), 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 (" + 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 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 |