chromium/media/mojo/services/cdm_service.cc

// Copyright 2014 The Chromium Authors
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.

#include "media/mojo/services/cdm_service.h"

#include <utility>

#include "base/functional/bind.h"
#include "base/logging.h"
#include "base/memory/raw_ptr.h"
#include "base/memory/weak_ptr.h"
#include "media/base/cdm_factory.h"
#include "media/mojo/services/mojo_cdm_service.h"
#include "media/mojo/services/mojo_cdm_service_context.h"
#include "mojo/public/cpp/bindings/remote.h"
#include "mojo/public/cpp/bindings/unique_receiver_set.h"

namespace media {

namespace {

// Implementation of mojom::CdmFactory that creates and hosts MojoCdmServices
// which then host CDMs created by the media::CdmFactory provided by the
// CdmService::Client.
//
// Lifetime Note:
// 1. CdmFactoryImpl instances are owned by a DeferredDestroyUniqueReceiverSet
//    directly, which is owned by CdmService.
// 2. CdmFactoryImpl is destroyed in any of the following two cases:
//   - CdmService is destroyed. Because of (2) this should not happen except for
//     during browser shutdown, when the Cdservice could be destroyed directly,
//     ignoring any outstanding interface connections.
//   - mojo::CdmFactory disconnection happens, AND CdmFactoryImpl doesn't own
//     any CDMs (|cdm_receivers_| is empty). This is to prevent destroying the
//     CDMs too early (e.g. during page navigation) which could cause errors
//     (session closed) on the client side. See https://crbug.com/821171 for
//     details.
class CdmFactoryImpl final : public DeferredDestroy<mojom::CdmFactory> { … };

}  // namespace

CdmService::CdmService(std::unique_ptr<Client> client,
                       mojo::PendingReceiver<mojom::CdmService> receiver)
    : … { … }

CdmService::~CdmService() { … }

void CdmService::CreateCdmFactory(
    mojo::PendingReceiver<mojom::CdmFactory> receiver,
    mojo::PendingRemote<mojom::FrameInterfaceFactory> frame_interfaces) { … }

}  // namespace media