Migrating MediaSession messages to mojo

content/browser/media/android/media_session_service_impl.cc

+// Copyright 2016 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 "content/browser/media/android/media_session_service_impl.h"
+
+#include "base/strings/utf_string_conversions.h"
+#include "content/browser/media/android/browser_media_session_manager.h"
+#include "content/browser/media/android/media_web_contents_observer_android.h"
+#include "content/browser/web_contents/web_contents_impl.h"
+#include "content/public/browser/browser_thread.h"
+#include "content/public/browser/web_contents.h"
+#include "content/public/common/media_metadata.h"
+
+namespace content {
+
+namespace {
+
+MediaMetadata::Artwork ToMediaMetadataIcon(
+    blink::mojom::MediaMetadataIconPtr mojo_icon) {
+  DCHECK(mojo_icon);
+  MediaMetadata::Artwork icon;
+  icon.src = GURL(mojo_icon->src);
+  icon.type = mojo_icon->type;
+  icon.sizes = mojo_icon->sizes;
+  return icon;
+}
+
+base::Optional<MediaMetadata> ToMediaMetadata(
+    blink::mojom::MediaMetadataPtr mojo_metadata) {
+  if (!mojo_metadata)
+    return base::nullopt;
+  MediaMetadata metadata;
+  metadata.title = mojo_metadata->title;
+  metadata.artist = mojo_metadata->artist;
+  metadata.album = mojo_metadata->album;
+  for (auto& mojo_icon : mojo_metadata->artwork)
+    metadata.artwork.push_back(ToMediaMetadataIcon(std::move(mojo_icon)));
+  return metadata;
+}
+
+}  // anonymous namespace
+
+MediaSessionServiceImpl::MediaSessionServiceImpl(
+    RenderFrameHost* render_frame_host)
+    : render_frame_host_(render_frame_host) {}
+
+MediaSessionServiceImpl::~MediaSessionServiceImpl() = default;
+
+// static
+void MediaSessionServiceImpl::Create(
+    RenderFrameHost* render_frame_host,
+    blink::mojom::MediaSessionServiceRequest request) {
+  MediaSessionServiceImpl* impl = new MediaSessionServiceImpl(
+      render_frame_host);
+  impl->Bind(std::move(request));
+}
+
+void MediaSessionServiceImpl::SetMetadata(
+    blink::mojom::MediaMetadataPtr metadata) {

[xhwang, 2016/09/30 23:24:58]

Have you considered to use typemapping so that the conversion part will be
hidden from this file?

https://www.chromium.org/developers/design-documents/mojo/type-mapping

[Zhiqiang Zhang (Slow), 2016/10/03 14:31:13]

Done on the chromium side. The blink-side typemaping needs some tricky changes
which will make the CL even more complex. Added a TODO.

+  WebContentsImpl* contents = static_cast<WebContentsImpl*>(
+      WebContents::FromRenderFrameHost(render_frame_host_));
+  DCHECK(contents);
+  MediaWebContentsObserverAndroid* observer =
+      static_cast<MediaWebContentsObserverAndroid*>(
+          contents->media_web_contents_observer());
+  observer->GetMediaSessionManager(render_frame_host_)
+      ->OnSetMetadata(0, ToMediaMetadata(std::move(metadata)));
+}
+
+void MediaSessionServiceImpl::Bind(
+    mojo::InterfaceRequest<blink::mojom::MediaSessionService> request) {
+  binding_.reset(new mojo::Binding<blink::mojom::MediaSessionService>(
+      this, std::move(request)));
+}
+
+}  // namespace content