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      1 /*
      2  * Copyright (C) 2011 Apple Inc. All rights reserved.
      3  *
      4  * Redistribution and use in source and binary forms, with or without
      5  * modification, are permitted provided that the following conditions
      6  * are met:
      7  * 1. Redistributions of source code must retain the above copyright
      8  *    notice, this list of conditions and the following disclaimer.
      9  * 2. Redistributions in binary form must reproduce the above copyright
     10  *    notice, this list of conditions and the following disclaimer in the
     11  *    documentation and/or other materials provided with the distribution.
     12  *
     13  * THIS SOFTWARE IS PROVIDED BY APPLE INC. AND ITS CONTRIBUTORS ``AS IS''
     14  * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO,
     15  * THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
     16  * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL APPLE INC. OR ITS CONTRIBUTORS
     17  * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
     18  * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
     19  * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
     20  * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
     21  * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
     22  * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF
     23  * THE POSSIBILITY OF SUCH DAMAGE.
     24  */
     25 
     26 #ifndef TextTrackLoader_h
     27 #define TextTrackLoader_h
     28 
     29 #include "core/fetch/RawResource.h"
     30 #include "core/fetch/ResourceOwner.h"
     31 #include "core/html/track/vtt/VTTParser.h"
     32 #include "platform/Timer.h"
     33 #include "platform/heap/Handle.h"
     34 #include "wtf/OwnPtr.h"
     35 
     36 namespace blink {
     37 
     38 class Document;
     39 class TextTrackLoader;
     40 
     41 class TextTrackLoaderClient : public ResourceOwner<RawResource> {
     42 public:
     43     virtual ~TextTrackLoaderClient() { }
     44 
     45     virtual void newCuesAvailable(TextTrackLoader*) = 0;
     46     virtual void cueLoadingCompleted(TextTrackLoader*, bool loadingFailed) = 0;
     47     virtual void newRegionsAvailable(TextTrackLoader*) = 0;
     48 };
     49 
     50 class TextTrackLoader FINAL : public NoBaseWillBeGarbageCollectedFinalized<TextTrackLoader>, public ResourceOwner<RawResource>, private VTTParserClient {
     51     WTF_MAKE_NONCOPYABLE(TextTrackLoader);
     52     WTF_MAKE_FAST_ALLOCATED_WILL_BE_REMOVED;
     53 public:
     54     static PassOwnPtrWillBeRawPtr<TextTrackLoader> create(TextTrackLoaderClient& client, Document& document)
     55     {
     56         return adoptPtrWillBeNoop(new TextTrackLoader(client, document));
     57     }
     58     virtual ~TextTrackLoader();
     59 
     60     bool load(const KURL&, const AtomicString& crossOriginMode);
     61     void cancelLoad();
     62 
     63     enum State { Idle, Loading, Finished, Failed };
     64     State loadState() { return m_state; }
     65 
     66     void getNewCues(WillBeHeapVector<RefPtrWillBeMember<VTTCue> >& outputCues);
     67     void getNewRegions(WillBeHeapVector<RefPtrWillBeMember<VTTRegion> >& outputRegions);
     68 
     69     void trace(Visitor*);
     70 
     71 private:
     72     // RawResourceClient
     73     virtual void dataReceived(Resource*, const char* data, int length) OVERRIDE;
     74     virtual void notifyFinished(Resource*) OVERRIDE;
     75 
     76     // VTTParserClient
     77     virtual void newCuesParsed() OVERRIDE;
     78     virtual void newRegionsParsed() OVERRIDE;
     79     virtual void fileFailedToParse() OVERRIDE;
     80 
     81     TextTrackLoader(TextTrackLoaderClient&, Document&);
     82 
     83     void cueLoadTimerFired(Timer<TextTrackLoader>*);
     84     void corsPolicyPreventedLoad(SecurityOrigin*, const KURL&);
     85 
     86     Document& document() const { return *m_document; }
     87 
     88     TextTrackLoaderClient& m_client;
     89     OwnPtrWillBeMember<VTTParser> m_cueParser;
     90     // FIXME: Remove this pointer and get the Document from m_client.
     91     RawPtrWillBeMember<Document> m_document;
     92     Timer<TextTrackLoader> m_cueLoadTimer;
     93     State m_state;
     94     bool m_newCuesAvailable;
     95 };
     96 
     97 } // namespace blink
     98 
     99 #endif
    100