Factor out AudioOutputDelegate from AudioRendererHost.

content/browser/renderer_host/media/audio_renderer_host.h

 // Copyright (c) 2012 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.
 //
 // AudioRendererHost serves audio related requests from AudioRenderer which
 // lives inside the render process and provide access to audio hardware.
 //
 // This class is owned by RenderProcessHostImpl, and instantiated on UI
 // thread, but all other operations and method calls happen on IO thread, so we
 // need to be extra careful about the lifetime of this object. AudioManager is a
@@ skipping 28 matching lines @@
 
 #ifndef CONTENT_BROWSER_RENDERER_HOST_MEDIA_AUDIO_RENDERER_HOST_H_
 #define CONTENT_BROWSER_RENDERER_HOST_MEDIA_AUDIO_RENDERER_HOST_H_
 
 #include <stddef.h>
 
 #include <map>
 #include <memory>
 #include <string>
 #include <utility>
+#include <vector>
 
 #include "base/atomic_ref_count.h"
 #include "base/gtest_prod_util.h"
 #include "base/logging.h"
 #include "base/macros.h"
 #include "base/memory/ref_counted.h"
+#include "base/memory/shared_memory.h"
 #include "base/process/process.h"
 #include "base/sequenced_task_runner_helpers.h"
+#include "base/sync_socket.h"
+#include "content/browser/renderer_host/media/audio_output_delegate.h"
 #include "content/browser/renderer_host/media/media_devices_manager.h"
 #include "content/common/content_export.h"
 #include "content/public/browser/browser_message_filter.h"
 #include "content/public/browser/browser_thread.h"
 #include "content/public/browser/render_process_host.h"
 #include "content/public/browser/resource_context.h"
 #include "media/audio/audio_io.h"
 #include "media/audio/audio_logging.h"
 #include "media/audio/audio_output_controller.h"
 #include "media/audio/simple_sources.h"
 #include "url/origin.h"
 
 namespace media {
 class AudioManager;
 class AudioParameters;
 }
 
 namespace content {
 
 class AudioMirroringManager;
 class MediaInternals;
 class MediaStreamManager;
 class MediaStreamUIProxy;
 class ResourceContext;
 
-class CONTENT_EXPORT AudioRendererHost : public BrowserMessageFilter {
+class CONTENT_EXPORT AudioRendererHost
+    : public BrowserMessageFilter,
+      private AudioOutputDelegate::EventHandler {
  public:
   // Called from UI thread from the owner of this object.
   AudioRendererHost(int render_process_id,
                     media::AudioManager* audio_manager,
                     AudioMirroringManager* mirroring_manager,
                     MediaInternals* media_internals,
                     MediaStreamManager* media_stream_manager,
                     const std::string& salt);
 
   // Calls |callback| with the list of AudioOutputControllers for this object.
@@ skipping 12 matching lines @@
 
  private:
   friend class AudioRendererHostTest;
   friend class BrowserThread;
   friend class base::DeleteHelper<AudioRendererHost>;
   friend class MockAudioRendererHost;
   friend class TestAudioRendererHost;
   FRIEND_TEST_ALL_PREFIXES(AudioRendererHostTest, CreateMockStream);
   FRIEND_TEST_ALL_PREFIXES(AudioRendererHostTest, MockStreamDataConversation);
 
-  class AudioEntry;
-  typedef std::map<int, AudioEntry*> AudioEntryMap;
-
   // Internal callback type for access requests to output devices.
   // |have_access| is true only if there is permission to access the device.
   typedef base::Callback<void(bool have_access)> OutputDeviceAccessCB;
 
   // The type of a function that is run on the UI thread to check whether the
   // routing IDs reference a valid RenderFrameHost. The function then runs
   // |callback| on the IO thread with true/false if valid/invalid.
   using ValidateRenderFrameIdFunction =
       void (*)(int render_process_id,
                int render_frame_id,
                const base::Callback<void(bool)>& callback);
 
   ~AudioRendererHost() override;
 
+  // AudioOutputDelegate::EventHandler implementation
+  void OnStreamCreated(int stream_id,
+                       base::SharedMemory* shared_memory,
+                       base::CancelableSyncSocket* foreign_socket) override;
+  void OnStreamError(int stream_id) override;
+  void OnStreamStateChanged(bool is_playing) override;
+
   // Methods called on IO thread ----------------------------------------------
 
   // Audio related IPC message handlers.
 
   // Request permission to use an output device for use by a stream produced
   // in the RenderFrame referenced by |render_frame_id|.
   // |session_id| is used for unified IO to find out which input device to be
   // opened for the stream. For clients that do not use unified IO,
   // |session_id| will be ignored and the given |device_id| and
   // |security_origin| will be used to select the output device.
@@ skipping 19 matching lines @@
   void OnPauseStream(int stream_id);
 
   // Close the audio stream referenced by |stream_id|.
   void OnCloseStream(int stream_id);
 
   // Set the volume of the audio stream referenced by |stream_id|.
   void OnSetVolume(int stream_id, double volume);
 
   // Helper methods.
 
-  // Complete the process of creating an audio stream. This will set up the
-  // shared memory or shared socket in low latency mode and send the
-  // NotifyStreamCreated message to the peer.
-  void DoCompleteCreation(int stream_id);
-
   // Called after the |render_frame_id| provided to OnCreateStream() was
   // validated. When |is_valid| is false, this calls ReportErrorAndClose().
   void DidValidateRenderFrame(int stream_id, bool is_valid);
 
   // Updates status of stream for AudioStreamMonitor and updates
   // the number of playing streams.
   void StreamStateChanged(int stream_id, bool is_playing);
 
   RenderProcessHost::AudioOutputControllerList DoGetOutputControllers() const;
 
   // Send an error message to the renderer.
   void SendErrorMessage(int stream_id);
 
-  // Delete an audio entry, notifying observers first.  This is called by
-  // AudioOutputController after it has closed.
-  void DeleteEntry(std::unique_ptr<AudioEntry> entry);
-
   // Send an error message to the renderer, then close the stream.
   void ReportErrorAndClose(int stream_id);
 
-  // A helper method to look up a AudioEntry identified by |stream_id|.
-  // Returns NULL if not found.
-  AudioEntry* LookupById(int stream_id);
-
-  // A helper method to update the number of playing streams and alert the
-  // ResourceScheduler when the renderer starts or stops playing an audiostream.
-  void UpdateNumPlayingStreams(AudioEntry* entry, bool is_playing);
+  // A helper method to look up a AudioOutputDelegate identified by |stream_id|.
+  // Returns nullptr if not found.
+  AudioOutputDelegate* LookupById(int stream_id);
 
   // Check if the renderer process has access to the requested output device.
   void CheckOutputDeviceAccess(int render_frame_id,
                                const std::string& device_id,
                                const url::Origin& security_origin,
                                int stream_id,
                                base::TimeTicks auth_start_time);
 
   // Proceed with device authorization after checking permissions.
   void AccessChecked(std::unique_ptr<MediaStreamUIProxy> ui_proxy,
@@ skipping 36 matching lines @@
   // ID of the RenderProcessHost that owns this instance.
   const int render_process_id_;
 
   media::AudioManager* const audio_manager_;
   AudioMirroringManager* const mirroring_manager_;
   std::unique_ptr<media::AudioLog> audio_log_;
 
   // Used to access to AudioInputDeviceManager.
   MediaStreamManager* media_stream_manager_;
 
-  // A map of stream IDs to audio sources.
-  AudioEntryMap audio_entries_;
+  using AudioOutputDelegateList =
+      std::vector<std::unique_ptr<AudioOutputDelegate>>;
+
+  // A list of the current open streams.
+  AudioOutputDelegateList delegates_;
 
   // The number of streams in the playing state. Atomic read safe from any
   // thread, but should only be updated from the IO thread.
   base::AtomicRefCount num_playing_streams_;
 
   // Salt required to translate renderer device IDs to raw device unique IDs
   std::string salt_;
 
   // Map of device authorizations for streams that are not yet created
   // The key is the stream ID, and the value is a pair. The pair's first element
   // is a bool that is true if the authorization process completes successfully.
   // The second element contains the unique ID of the authorized device.
   std::map<int, std::pair<bool, std::string>> authorizations_;
 
   // At stream creation time, AudioRendererHost will call this function on the
   // UI thread to validate render frame IDs. A default is set by the
   // constructor, but this can be overridden by unit tests.
   ValidateRenderFrameIdFunction validate_render_frame_id_function_;
 
   // The maximum number of simultaneous streams during the lifetime of this
   // host. Reported as UMA stat at shutdown.
   size_t max_simultaneous_streams_;
 
   DISALLOW_COPY_AND_ASSIGN(AudioRendererHost);
 };
 
 }  // namespace content
 
 #endif  // CONTENT_BROWSER_RENDERER_HOST_MEDIA_AUDIO_RENDERER_HOST_H_