/* -*- Mode: C++; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 2 -*- */

/* vim: set ts=8 sts=2 et sw=2 tw=80: */

/* This Source Code Form is subject to the terms of the Mozilla Public

 * License, v. 2.0. If a copy of the MPL was not distributed with this

 * file, You can obtain one at http://mozilla.org/MPL/2.0/. */

#ifndef AllocationHandle_h

#define AllocationHandle_h

#include <cstdint>

#include <limits>

#include "MediaEnginePrefs.h"

#include "MediaManager.h"

#include "MediaTrackConstraints.h"

#include "mozilla/Assertions.h"

#include "mozilla/ipc/PBackgroundSharedTypes.h"

#include "nsString.h"

namespace mozilla {

/**

 * AllocationHandle helps keep track of metadata for allocations of shared

 * MediaEngineSources. That is, for MediaEngineSources that support more than

 * one concurrent allocation.

 */

class AllocationHandle

{

  ~AllocationHandle() = default;

public:

  static uint64_t GetUniqueId()

  {

    static uint64_t sId = 0;

    MOZ_ASSERT(MediaManager::GetIfExists());

    MOZ_ASSERT(MediaManager::GetIfExists()->IsInMediaThread());

    MOZ_RELEASE_ASSERT(sId < std::numeric_limits<decltype(sId)>::max());

    return sId++;

  }

  NS_INLINE_DECL_THREADSAFE_REFCOUNTING(AllocationHandle);

  AllocationHandle() = delete;

  AllocationHandle(const dom::MediaTrackConstraints& aConstraints,

                   const ipc::PrincipalInfo& aPrincipalInfo,

                   const nsString& aDeviceId)

    : mId(GetUniqueId())

    , mDeviceId(aDeviceId)

    , mPrincipalInfo(aPrincipalInfo)

    , mConstraints(aConstraints)

  {}

  const uint64_t mId;

  const nsString mDeviceId;

  const ipc::PrincipalInfo mPrincipalInfo;

  NormalizedConstraints mConstraints;

};

} // namespace mozilla

#endif // AllocationHandle_h