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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.
#include "cobalt/media_session/media_session_client.h"
namespace cobalt {
namespace media_session {
MediaSessionPlaybackState MediaSessionClient::GetActualPlaybackState() {
DCHECK(thread_checker_.CalledOnValidThread());
// Per https://wicg.github.io/mediasession/#guessed-playback-state
// - If the "declared playback state" is "playing", then return "playing"
// - Otherwise, return the guessed playback state
MediaSessionPlaybackState declared_state;
declared_state = media_session_->playback_state();
if (declared_state == kMediaSessionPlaybackStatePlaying) {
return kMediaSessionPlaybackStatePlaying;
}
if (platform_playback_state_ == kMediaSessionPlaybackStatePlaying) {
// "...guessed playback state is playing if any of them is
// potentially playing and not muted..."
return kMediaSessionPlaybackStatePlaying;
}
// It's not super clear what to do when the declared state or the
// active media session state is kPaused or kNone
if (declared_state == kMediaSessionPlaybackStatePaused) {
return kMediaSessionPlaybackStatePaused;
}
return kMediaSessionPlaybackStateNone;
}
MediaSessionClient::AvailableActionsSet
MediaSessionClient::GetAvailableActions() {
DCHECK(thread_checker_.CalledOnValidThread());
// "Available actions" are determined based on active media session
// and supported media session actions.
// Note for cobalt, there's only one window/tab so there's only one
// "active media session"
// https://wicg.github.io/mediasession/#actions-model
//
// Note that this is essentially the "media session actions update algorithm"
// inverted.
AvailableActionsSet result = AvailableActionsSet();
for (MediaSession::ActionMap::iterator it =
media_session_->action_map_.begin();
it != media_session_->action_map_.end();
++it) {
result[it->first] = true;
}
switch (GetActualPlaybackState()) {
case kMediaSessionPlaybackStatePlaying:
// "If the active media session’s actual playback state is playing, remove
// play from available actions."
result[kMediaSessionActionPlay] = false;
break;
default:
// "Otherwise, remove pause from available actions."
result[kMediaSessionActionPause] = false;
break;
}
return result;
}
void MediaSessionClient::UpdatePlatformPlaybackState(
MediaSessionPlaybackState state) {
if (base::MessageLoopProxy::current() != media_session_->message_loop_) {
media_session_->message_loop_->PostTask(
FROM_HERE, base::Bind(&MediaSessionClient::UpdatePlatformPlaybackState,
base::Unretained(this), state));
return;
}
MediaSessionPlaybackState prev_actual_state = GetActualPlaybackState();
platform_playback_state_ = state;
if (prev_actual_state != GetActualPlaybackState()) {
OnMediaSessionChanged();
}
}
void MediaSessionClient::InvokeAction(MediaSessionAction action) {
if (base::MessageLoopProxy::current() != media_session_->message_loop_) {
media_session_->message_loop_->PostTask(
FROM_HERE, base::Bind(&MediaSessionClient::InvokeAction,
base::Unretained(this), action));
return;
}
MediaSession::ActionMap::iterator it =
media_session_->action_map_.find(action);
if (it == media_session_->action_map_.end()) {
return;
}
it->second->value().Run();
}
} // namespace media_session
} // namespace cobalt