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// Copyright 2017 Google Inc. All Rights Reserved.
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
// http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.
#ifndef COBALT_MEDIA_SESSION_MEDIA_SESSION_CLIENT_H_
#define COBALT_MEDIA_SESSION_MEDIA_SESSION_CLIENT_H_
#include <bitset>
#include "base/threading/thread_checker.h"
#include "cobalt/media_session/media_session.h"
namespace cobalt {
namespace media_session {
// Base class for a platform-level implementation of MediaSession.
// Platforms should subclass this to connect MediaSession to their platform.
class MediaSessionClient {
public:
typedef std::bitset<kMediaSessionActionNumActions> AvailableActionsSet;
MediaSessionClient()
: media_session_(new MediaSession(this)),
platform_playback_state_(kMediaSessionPlaybackStateNone) {}
virtual ~MediaSessionClient() {}
// Creates platform-specific instance.
static scoped_ptr<MediaSessionClient> Create();
// Retrieves the singleton MediaSession associated with this client.
scoped_refptr<MediaSession>& GetMediaSession() { return media_session_; }
// Retrieves the current actual playback state.
// https://wicg.github.io/mediasession/#actual-playback-state
// Must be called on the browser thread.
MediaSessionPlaybackState GetActualPlaybackState();
// Retrieves the set of currently available mediasession actions
// per "media session actions update algorithm"
// https://wicg.github.io/mediasession/#actions-model
AvailableActionsSet GetAvailableActions();
// Sets the platform's current playback state. This is used to compute
// the "guessed playback state"
// https://wicg.github.io/mediasession/#guessed-playback-state
// Can be invoked from any thread.
void UpdatePlatformPlaybackState(MediaSessionPlaybackState state);
// Invokes a given media session action
// https://wicg.github.io/mediasession/#actions-model
// Can be invoked from any thread.
void InvokeAction(MediaSessionAction action);
// Invoked on the browser thread when any metadata, playback state,
// or supported session actions change.
virtual void OnMediaSessionChanged() = 0;
private:
base::ThreadChecker thread_checker_;
scoped_refptr<MediaSession> media_session_;
MediaSessionPlaybackState platform_playback_state_;
DISALLOW_COPY_AND_ASSIGN(MediaSessionClient);
};
} // namespace media_session
} // namespace cobalt
#endif // COBALT_MEDIA_SESSION_MEDIA_SESSION_CLIENT_H_