Add GetUrl to DemuxerStreamProvider interface

media/base/android/media_url_demuxer.h

+// 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.
+
+#ifndef MEDIA_BASE_ANDROID_MEDIA_URL_DEMUXER_H_
+#define MEDIA_BASE_ANDROID_MEDIA_URL_DEMUXER_H_
+
+#include <stddef.h>
+
+#include "base/callback.h"
+#include "base/macros.h"
+#include "base/memory/weak_ptr.h"
+#include "media/base/demuxer.h"
+#include "url/gurl.h"
+
+namespace media {
+
+// Class that saves a URL for later retrieval. To be used in conjunction with
+// the MediaPlayerRenderer.
+//
+// Its primary purpose is to act as a dummy Demuxer, when there is no need
+// for DemuxerStreams (e.g. in the MediaPlayerRenderer case). For the most part,
+// its implementation of the Demuxer are NOPs that return the default values and
+// fire any provided callbacks immediately.
+//
+// If Pipeline where to be refactored to use a DemuxerStreamProvider instead of
+// a Demuxer, MediaUrlDemuxer should be refactored to inherit directly from
+// DemuxerStreamProvider.
+class MediaUrlDemuxer : public Demuxer {
+ public:
+  explicit MediaUrlDemuxer(const GURL& url);
+  ~MediaUrlDemuxer() override;
+
+  // DemuxerStreamProvider interface.
+  DemuxerStream* GetStream(DemuxerStream::Type type) override;
+  GURL GetUrl() override;
+  Type type() final { return DemuxerStreamProvider::Type::URL; };

[xhwang, 2016/06/24 03:19:47]

nit: We don't really distinguish between override and final. Now you use them
both and people may wonder why. I don't think we expect people to extend this
class and override any class again. Maybe use final for the class, or mark all
methods final or override, just to avoid confusion.

[tguilbert, 2016/06/24 21:18:42]

Done.

+
+  // Demuxer interface.
+  std::string GetDisplayName() const override;
+  void Initialize(DemuxerHost* host,
+                  const PipelineStatusCB& status_cb,
+                  bool enable_text_tracks) override;
+  void StartWaitingForSeek(base::TimeDelta seek_time) override;
+  void CancelPendingSeek(base::TimeDelta seek_time) override;
+  void Seek(base::TimeDelta time, const PipelineStatusCB& status_cb) override;
+  void Stop() override;
+  base::TimeDelta GetStartTime() const override;
+  base::Time GetTimelineOffset() const override;
+  int64_t GetMemoryUsage() const override;
+
+ private:
+  GURL url_;
+
+  DISALLOW_COPY_AND_ASSIGN(MediaUrlDemuxer);
+};
+
+}  // namespace media
+
+#endif  // MEDIA_BASE_ANDROID_MEDIA_URL_DEMUXER_H_