1/*
2 * Copyright (C) 2012 Apple Inc. All rights reserved.
3 * Copyright (C) 2013 Cable Television Labs, Inc. All rights reserved.
4 *
5 * Redistribution and use in source and binary forms, with or without
6 * modification, are permitted provided that the following conditions
7 * are met:
8 *
9 * 1. Redistributions of source code must retain the above copyright
10 *    notice, this list of conditions and the following disclaimer.
11 * 2. Redistributions in binary form must reproduce the above copyright
12 *    notice, this list of conditions and the following disclaimer in the
13 *    documentation and/or other materials provided with the distribution.
14 *
15 * THIS SOFTWARE IS PROVIDED BY APPLE INC. ``AS IS'' AND ANY
16 * EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
17 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
18 * PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL APPLE INC. OR
19 * CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
20 * EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
21 * PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR
22 * PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY
23 * OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
24 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
25 * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
26 */
27
28#ifndef TrackPrivateBase_h
29#define TrackPrivateBase_h
30
31#include <wtf/Forward.h>
32#include <wtf/Noncopyable.h>
33#include <wtf/RefCounted.h>
34#include <wtf/text/AtomicString.h>
35
36#if ENABLE(VIDEO_TRACK)
37
38namespace WebCore {
39
40class TrackPrivateBase;
41
42class TrackPrivateBaseClient {
43public:
44    virtual ~TrackPrivateBaseClient() { }
45    virtual void idChanged(TrackPrivateBase*, const AtomicString&) = 0;
46    virtual void labelChanged(TrackPrivateBase*, const AtomicString&) = 0;
47    virtual void languageChanged(TrackPrivateBase*, const AtomicString&) = 0;
48    virtual void willRemove(TrackPrivateBase*) = 0;
49};
50
51class TrackPrivateBase : public RefCounted<TrackPrivateBase> {
52    WTF_MAKE_NONCOPYABLE(TrackPrivateBase); WTF_MAKE_FAST_ALLOCATED;
53public:
54    virtual ~TrackPrivateBase() { }
55
56    virtual TrackPrivateBaseClient* client() const = 0;
57
58    virtual AtomicString id() const { return emptyAtom; }
59    virtual AtomicString label() const { return emptyAtom; }
60    virtual AtomicString language() const { return emptyAtom; }
61
62    virtual int trackIndex() const { return 0; }
63
64    virtual double startTimeVariance() const { return 0; }
65
66    void willBeRemoved()
67    {
68        if (TrackPrivateBaseClient* client = this->client())
69            client->willRemove(this);
70    }
71
72protected:
73    TrackPrivateBase() { }
74};
75
76} // namespace WebCore
77
78#endif
79#endif
80