| // 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. |
| |
| #include "cobalt/media_session/media_session.h" |
| |
| #include "cobalt/media_session/media_session_client.h" |
| |
| namespace cobalt { |
| namespace media_session { |
| |
| MediaSession::MediaSession(MediaSessionClient* client) |
| : media_session_client_(client), |
| state_(kMediaSessionPlaybackStateNone), |
| message_loop_(base::MessageLoopProxy::current()), |
| is_change_task_queued_(false) {} |
| |
| MediaSession::~MediaSession() { |
| ActionMap::iterator it; |
| for (it = action_map_.begin(); it != action_map_.end(); ++it) { |
| delete it->second; |
| } |
| action_map_.clear(); |
| } |
| |
| void MediaSession::set_metadata(scoped_refptr<MediaMetadata> value) { |
| metadata_ = value; |
| MaybeQueueChangeTask(); |
| } |
| |
| void MediaSession::set_playback_state(MediaSessionPlaybackState state) { |
| state_ = state; |
| MaybeQueueChangeTask(); |
| } |
| |
| void MediaSession::SetActionHandler( |
| MediaSessionAction action, const MediaSessionActionHandlerHolder& handler) { |
| // See algorithm https://wicg.github.io/mediasession/#actions-model |
| DCHECK_EQ(base::MessageLoopProxy::current(), message_loop_.get()); |
| ActionMap::iterator it = action_map_.find(action); |
| |
| if (it != action_map_.end()) { |
| delete it->second; |
| action_map_.erase(it); |
| } |
| if (!handler.IsNull()) { |
| action_map_[action] = new MediaSessionActionHandlerReference(this, handler); |
| } |
| |
| MaybeQueueChangeTask(); |
| } |
| |
| void MediaSession::TraceMembers(script::Tracer* tracer) { |
| tracer->Trace(metadata_); |
| } |
| |
| void MediaSession::MaybeQueueChangeTask() { |
| DCHECK_EQ(base::MessageLoopProxy::current(), message_loop_.get()); |
| if (is_change_task_queued_) { |
| return; |
| } |
| is_change_task_queued_ = true; |
| message_loop_->PostTask( |
| FROM_HERE, base::Bind(&MediaSession::OnChanged, base::Unretained(this))); |
| } |
| |
| void MediaSession::OnChanged() { |
| is_change_task_queued_ = false; |
| media_session_client_->OnMediaSessionChanged(); |
| } |
| |
| } // namespace media_session |
| } // namespace cobalt |