content/browser/renderer_host/media/audio_renderer_host.h

   1 // Copyright (c) 2012 The Chromium Authors. All rights reserved.
   2 // Use of this source code is governed by a BSD-style license that can be
   3 // found in the LICENSE file.
   4 //
   5 // AudioRendererHost serves audio related requests from AudioRenderer which
   6 // lives inside the render process and provide access to audio hardware.
   7 //
   8 // This class is owned by BrowserRenderProcessHost, and instantiated on UI
   9 // thread, but all other operations and method calls happen on IO thread, so we
  10 // need to be extra careful about the lifetime of this object. AudioManager is a
  11 // singleton and created in IO thread, audio output streams are also created in
  12 // the IO thread, so we need to destroy them also in IO thread. After this class
  13 // is created, a task of OnInitialized() is posted on IO thread in which
  14 // singleton of AudioManager is created.
  15 //
  16 // Here's an example of a typical IPC dialog for audio:
  17 //
  18 //   Renderer                     AudioRendererHost
  19 //      |                               |
  20 //      |         CreateStream >        |
  21 //      |     < NotifyStreamCreated     |
  22 //      |                               |
  23 //      |          PlayStream >         |
  24 //      |  < NotifyStreamStateChanged   | kAudioStreamPlaying
  25 //      |                               |
  26 //      |         PauseStream >         |
  27 //      |  < NotifyStreamStateChanged   | kAudioStreamPaused
  28 //      |                               |
  29 //      |          PlayStream >         |
  30 //      |  < NotifyStreamStateChanged   | kAudioStreamPlaying
  31 //      |             ...               |
  32 //      |         CloseStream >         |
  33 //      v                               v
  34
  35 // A SyncSocket pair is used to signal buffer readiness between processes.
  36
  37 #ifndef CONTENT_BROWSER_RENDERER_HOST_MEDIA_AUDIO_RENDERER_HOST_H_
  38 #define CONTENT_BROWSER_RENDERER_HOST_MEDIA_AUDIO_RENDERER_HOST_H_
  39
  40 #include <map>
  41
  42 #include "base/atomic_ref_count.h"
  43 #include "base/gtest_prod_util.h"
  44 #include "base/memory/ref_counted.h"
  45 #include "base/memory/scoped_ptr.h"
  46 #include "base/process/process.h"
  47 #include "base/sequenced_task_runner_helpers.h"
  48 #include "content/common/content_export.h"
  49 #include "content/public/browser/browser_message_filter.h"
  50 #include "content/public/browser/browser_thread.h"
  51 #include "content/public/browser/render_view_host.h"
  52 #include "media/audio/audio_io.h"
  53 #include "media/audio/audio_logging.h"
  54 #include "media/audio/audio_output_controller.h"
  55 #include "media/audio/simple_sources.h"
  56
  57 namespace media {
  58 class AudioManager;
  59 class AudioParameters;
  60 }
  61
  62 namespace content {
  63
  64 class AudioMirroringManager;
  65 class MediaInternals;
  66 class MediaStreamManager;
  67 class ResourceContext;
  68
  69 class CONTENT_EXPORT AudioRendererHost : public BrowserMessageFilter {
  70  public:
  71   // Called from UI thread from the owner of this object.
  72   AudioRendererHost(int render_process_id,
  73                     media::AudioManager* audio_manager,
  74                     AudioMirroringManager* mirroring_manager,
  75                     MediaInternals* media_internals,
  76                     MediaStreamManager* media_stream_manager);
  77
  78   // Calls |callback| with the list of AudioOutputControllers for this object.
  79   void GetOutputControllers(
  80       int render_view_id,
  81       const RenderViewHost::GetAudioOutputControllersCallback& callback) const;
  82
  83   // BrowserMessageFilter implementation.
  84   virtual void OnChannelClosing() OVERRIDE;
  85   virtual void OnDestruct() const OVERRIDE;
  86   virtual bool OnMessageReceived(const IPC::Message& message) OVERRIDE;
  87
  88   // Returns true if any streams managed by this host are actively playing.  Can
  89   // be called from any thread.
  90   bool HasActiveAudio();
  91
  92  private:
  93   friend class AudioRendererHostTest;
  94   friend class BrowserThread;
  95   friend class base::DeleteHelper<AudioRendererHost>;
  96   friend class MockAudioRendererHost;
  97   friend class TestAudioRendererHost;
  98   FRIEND_TEST_ALL_PREFIXES(AudioRendererHostTest, CreateMockStream);
  99   FRIEND_TEST_ALL_PREFIXES(AudioRendererHostTest, MockStreamDataConversation);
 100
 101   class AudioEntry;
 102   typedef std::map<int, AudioEntry*> AudioEntryMap;
 103
 104   virtual ~AudioRendererHost();
 105
 106   // Methods called on IO thread ----------------------------------------------
 107
 108   // Audio related IPC message handlers.
 109
 110   // Creates an audio output stream with the specified format whose data is
 111   // produced by an entity in the render view referenced by |render_view_id|.
 112   // |session_id| is used for unified IO to find out which input device to be
 113   // opened for the stream. For clients that do not use unified IO,
 114   // |session_id| will be ignored.
 115   // Upon success/failure, the peer is notified via the NotifyStreamCreated
 116   // message.
 117   void OnCreateStream(int stream_id,
 118                       int render_view_id,
 119                       int render_frame_id,
 120                       int session_id,
 121                       const media::AudioParameters& params);
 122
 123   // Play the audio stream referenced by |stream_id|.
 124   void OnPlayStream(int stream_id);
 125
 126   // Pause the audio stream referenced by |stream_id|.
 127   void OnPauseStream(int stream_id);
 128
 129   // Close the audio stream referenced by |stream_id|.
 130   void OnCloseStream(int stream_id);
 131
 132   // Set the volume of the audio stream referenced by |stream_id|.
 133   void OnSetVolume(int stream_id, double volume);
 134
 135   // Complete the process of creating an audio stream. This will set up the
 136   // shared memory or shared socket in low latency mode and send the
 137   // NotifyStreamCreated message to the peer.
 138   void DoCompleteCreation(int stream_id);
 139
 140   // Send playing/paused status to the renderer.
 141   void DoNotifyStreamStateChanged(int stream_id, bool is_playing);
 142
 143   RenderViewHost::AudioOutputControllerList DoGetOutputControllers(
 144       int render_view_id) const;
 145
 146   // Send an error message to the renderer.
 147   void SendErrorMessage(int stream_id);
 148
 149   // Delete an audio entry, notifying observers first.  This is called by
 150   // AudioOutputController after it has closed.
 151   void DeleteEntry(scoped_ptr<AudioEntry> entry);
 152
 153   // Send an error message to the renderer, then close the stream.
 154   void ReportErrorAndClose(int stream_id);
 155
 156   // A helper method to look up a AudioEntry identified by |stream_id|.
 157   // Returns NULL if not found.
 158   AudioEntry* LookupById(int stream_id);
 159
 160   // ID of the RenderProcessHost that owns this instance.
 161   const int render_process_id_;
 162
 163   media::AudioManager* const audio_manager_;
 164   AudioMirroringManager* const mirroring_manager_;
 165   scoped_ptr<media::AudioLog> audio_log_;
 166
 167   // Used to access to AudioInputDeviceManager.
 168   MediaStreamManager* media_stream_manager_;
 169
 170   // A map of stream IDs to audio sources.
 171   AudioEntryMap audio_entries_;
 172
 173   // The number of streams in the playing state.
 174   base::AtomicRefCount num_playing_streams_;
 175
 176   DISALLOW_COPY_AND_ASSIGN(AudioRendererHost);
 177 };
 178
 179 }  // namespace content
 180
 181 #endif  // CONTENT_BROWSER_RENDERER_HOST_MEDIA_AUDIO_RENDERER_HOST_H_