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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 "wtf/OwnPtr.h"
     34 
     35 namespace WebCore {
     36 
     37 class Document;
     38 class TextTrackLoader;
     39 
     40 class TextTrackLoaderClient : public ResourceOwner<RawResource> {
     41 public:
     42     virtual ~TextTrackLoaderClient() { }
     43 
     44     virtual void newCuesAvailable(TextTrackLoader*) = 0;
     45     virtual void cueLoadingCompleted(TextTrackLoader*, bool loadingFailed) = 0;
     46     virtual void newRegionsAvailable(TextTrackLoader*) = 0;
     47 };
     48 
     49 class TextTrackLoader : public ResourceOwner<RawResource>, private VTTParserClient {
     50     WTF_MAKE_NONCOPYABLE(TextTrackLoader);
     51     WTF_MAKE_FAST_ALLOCATED;
     52 public:
     53     static PassOwnPtr<TextTrackLoader> create(TextTrackLoaderClient& client, Document& document)
     54     {
     55         return adoptPtr(new TextTrackLoader(client, document));
     56     }
     57     virtual ~TextTrackLoader();
     58 
     59     bool load(const KURL&, const String& crossOriginMode);
     60     void cancelLoad();
     61 
     62     enum State { Idle, Loading, Finished, Failed };
     63     State loadState() { return m_state; }
     64 
     65     void getNewCues(Vector<RefPtr<VTTCue> >& outputCues);
     66     void getNewRegions(Vector<RefPtr<VTTRegion> >& outputRegions);
     67 private:
     68 
     69     // RawResourceClient
     70     virtual void dataReceived(Resource*, const char* data, int length) OVERRIDE;
     71     virtual void notifyFinished(Resource*) OVERRIDE;
     72 
     73     // VTTParserClient
     74     virtual void newCuesParsed() OVERRIDE;
     75     virtual void newRegionsParsed() OVERRIDE;
     76     virtual void fileFailedToParse() OVERRIDE;
     77 
     78     TextTrackLoader(TextTrackLoaderClient&, Document&);
     79 
     80     void cueLoadTimerFired(Timer<TextTrackLoader>*);
     81     void corsPolicyPreventedLoad();
     82 
     83     TextTrackLoaderClient& m_client;
     84     OwnPtr<VTTParser> m_cueParser;
     85     // FIXME: Remove this pointer and get the Document from m_client.
     86     Document& m_document;
     87     Timer<TextTrackLoader> m_cueLoadTimer;
     88     String m_crossOriginMode;
     89     State m_state;
     90     bool m_newCuesAvailable;
     91 };
     92 
     93 } // namespace WebCore
     94 
     95 #endif
     96