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/*
* Copyright (C) 2012-2017 Apple Inc. All rights reserved.
* Copyright (C) 2013 Cable Television Labs, Inc. All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
*
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
*
* THIS SOFTWARE IS PROVIDED BY APPLE INC. ``AS IS'' AND ANY
* EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
* PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL APPLE INC. OR
* CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
* EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
* PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR
* PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY
* OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
* OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
*/
#pragma once
#if ENABLE(VIDEO)
#include "ScriptExecutionContextIdentifier.h"
#include "TrackPrivateBaseClient.h"
#include <wtf/Lock.h>
#include <wtf/LoggerHelper.h>
#include <wtf/MediaTime.h>
#include <wtf/TZoneMalloc.h>
#include <wtf/ThreadSafeRefCounted.h>
#include <wtf/ThreadSafeWeakPtr.h>
#include <wtf/Vector.h>
#include <wtf/text/AtomString.h>
namespace WebCore {
using TrackID = uint64_t;
class WEBCORE_EXPORT TrackPrivateBase
: public ThreadSafeRefCountedAndCanMakeThreadSafeWeakPtr<TrackPrivateBase>
#if !RELEASE_LOG_DISABLED
, public LoggerHelper
#endif
{
WTF_MAKE_TZONE_ALLOCATED(TrackPrivateBase);
WTF_MAKE_NONCOPYABLE(TrackPrivateBase);
public:
virtual ~TrackPrivateBase() = default;
size_t addClient(TrackPrivateBaseClient::Dispatcher&&, TrackPrivateBaseClient&);
void removeClient(uint32_t); // Can be called multiple times with the same id.
virtual TrackID id() const { return 0; }
virtual AtomString label() const { return emptyAtom(); }
virtual AtomString language() const { return emptyAtom(); }
virtual int trackIndex() const { return 0; }
virtual std::optional<AtomString> trackUID() const;
virtual std::optional<bool> defaultEnabled() const;
virtual MediaTime startTimeVariance() const { return MediaTime::zeroTime(); }
void willBeRemoved()
{
notifyClients([](auto& client) {
client.willRemove();
});
}
bool operator==(const TrackPrivateBase&) const;
enum class Type { Video, Audio, Text };
virtual Type type() const = 0;
#if !RELEASE_LOG_DISABLED
virtual void setLogger(const Logger&, uint64_t);
const Logger& logger() const final { ASSERT(m_logger); return *m_logger.get(); }
uint64_t logIdentifier() const final { return m_logIdentifier; }
WTFLogChannel& logChannel() const final;
#endif
using Task = Function<void(TrackPrivateBaseClient&)>;
void notifyClients(Task&&);
void notifyMainThreadClient(Task&&);
protected:
TrackPrivateBase() = default;
template <typename T>
class Shared final : public ThreadSafeRefCounted<Shared<T>> {
public:
static Ref<Shared> create(T&& obj) { return adoptRef(*new Shared(WTFMove(obj))); }
T& get() { return m_obj; };
private:
Shared(T&& obj)
: m_obj(WTFMove(obj))
{
}
T m_obj;
};
using SharedDispatcher = Shared<TrackPrivateBaseClient::Dispatcher>;
bool hasClients() const;
bool hasOneClient() const;
mutable Lock m_lock;
using ClientRecord = std::tuple<RefPtr<SharedDispatcher>, WeakPtr<TrackPrivateBaseClient>, bool /* is main thread */>;
Vector<ClientRecord> m_clients WTF_GUARDED_BY_LOCK(m_lock);
#if !RELEASE_LOG_DISABLED
RefPtr<const Logger> m_logger;
uint64_t m_logIdentifier { 0 };
#endif
};
} // namespace WebCore
#endif
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