// Copyright 2013 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 CONTENT_BROWSER_MEDIA_ANDROID_BROWSER_DEMUXER_ANDROID_H_
#define CONTENT_BROWSER_MEDIA_ANDROID_BROWSER_DEMUXER_ANDROID_H_

#include <map>

#include "base/id_map.h"
#include "content/public/browser/browser_message_filter.h"
#include "media/base/android/demuxer_android.h"

namespace content {

// Represents the browser process half of an IPC-based demuxer proxy.
// It vends out media::DemuxerAndroid instances that are registered with an
// end point in the renderer process.
//
// Refer to RendererDemuxerAndroid for the renderer process half.
class CONTENT_EXPORT BrowserDemuxerAndroid : public BrowserMessageFilter {
 public:
  BrowserDemuxerAndroid();

  // BrowserMessageFilter overrides.
  base::TaskRunner* OverrideTaskRunnerForMessage(
      const IPC::Message& message) override;

  bool OnMessageReceived(const IPC::Message& message) override;

  // Returns an uninitialized demuxer implementation associated with
  // |demuxer_client_id|, which can be used to communicate with the real demuxer
  // in the renderer process.
  scoped_ptr<media::DemuxerAndroid> CreateDemuxer(int demuxer_client_id);

 protected:
  friend class base::RefCountedThreadSafe<BrowserDemuxerAndroid>;
  ~BrowserDemuxerAndroid() override;

 private:
  class Internal;

  // Called by internal demuxer implementations to add/remove a client
  // association.
  void AddDemuxerClient(int demuxer_client_id,
                        media::DemuxerAndroidClient* client);
  void RemoveDemuxerClient(int demuxer_client_id);

  // IPC message handlers.
  void OnDemuxerReady(int demuxer_client_id,
                      const media::DemuxerConfigs& configs);
  void OnReadFromDemuxerAck(int demuxer_client_id,
                            const media::DemuxerData& data);
  void OnDemuxerSeekDone(int demuxer_client_id,
                         const base::TimeDelta& actual_browser_seek_time);
  void OnDurationChanged(int demuxer_client_id,
                         const base::TimeDelta& duration);

  IDMap<media::DemuxerAndroidClient> demuxer_clients_;

  // When the demuxer client is created on UI thread but demuxer
  // messages arrive on Media thread their relative order is undefined.
  // Use |pending_configs_| map to keep the upcoming configurations
  // until the client is created.
  typedef std::map<int, media::DemuxerConfigs> ConfigsPerClient;
  ConfigsPerClient pending_configs_;

  base::SingleThreadTaskRunner* task_runner_;

  DISALLOW_COPY_AND_ASSIGN(BrowserDemuxerAndroid);
};

}  // namespace content

#endif  // CONTENT_BROWSER_MEDIA_ANDROID_BROWSER_DEMUXER_ANDROID_H_
