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// Copyright 2018 The Chromium Authors. All rights reserved.
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.
#include "base/callback_forward.h"
#include "media/base/media_export.h"
namespace media {
class VideoDecodeStatsDB;
// Interface for extracting a pointer to the DB from its owner. DB lifetime is
// assumed to match that of the provider. Callers must not use DB after provider
// has been destroyed. This allows sharing a "seed" DB instance between an
// Incognito profile and the original profile, which re-uses the in-memory
// cache for that DB and avoids race conditions of instantiating a second DB
// that reads the same files.
class MEDIA_EXPORT VideoDecodeStatsDBProvider {
// Request a pointer to the *initialized* DB owned by this provider. Call
// lazily to avoid triggering unnecessary DB initialization. |db| is null in
// the event of an error. Callback may be run immediately if |db| is already
// initialized by provider.
using GetCB = base::OnceCallback<void(VideoDecodeStatsDB* db)>;
virtual void GetVideoDecodeStatsDB(GetCB get_db_b) = 0;
virtual ~VideoDecodeStatsDBProvider();
} // namespace media