Begin adding support for tab mirroring via the MediaStream audio/video capturing

content/browser/renderer_host/media/audio_input_renderer_host.cc

 // 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.
 
 #include "content/browser/renderer_host/media/audio_input_renderer_host.h"
 
 #include "base/bind.h"
 #include "base/metrics/histogram.h"
 #include "base/process.h"
 #include "base/shared_memory.h"
 #include "content/browser/renderer_host/media/audio_input_device_manager.h"
 #include "content/browser/renderer_host/media/audio_input_sync_writer.h"
 #include "content/browser/renderer_host/media/media_stream_manager.h"
 #include "content/common/media/audio_messages.h"
+#include "content/public/common/media_stream_request.h"
 
 using content::BrowserMessageFilter;
 using content::BrowserThread;
 
 AudioInputRendererHost::AudioEntry::AudioEntry()
     : stream_id(0),
       pending_close(false) {
 }
 
 AudioInputRendererHost::AudioEntry::~AudioEntry() {}
@@ skipping 148 matching lines @@
 }
 void AudioInputRendererHost::OnStartDevice(int stream_id, int session_id) {
   VLOG(1) << "AudioInputRendererHost::OnStartDevice(stream_id="
           << stream_id << ", session_id = " << session_id << ")";
 
   // Add the session entry to the map.
   session_entries_[session_id] = stream_id;
 
   // Start the device with the session_id. If the device is started
   // successfully, OnDeviceStarted() callback will be triggered.
-  media_stream_manager_->audio_input_device_manager()->Start(session_id, this);
+  media_stream_manager_->GetAudioInputDeviceManager(
+      content::MEDIA_DEVICE_AUDIO_CAPTURE)->Start(session_id, this);
+  // NOTE: Currently, use of AudioInputHostMsg_* only applies to the
+  // MEDIA_DEVICE_AUDIO_CAPTURE.  The IPC interface could theoretically be
+  // extended to allow operation with the other video capture types (e.g., tab
+  // mirroring).
 }
 
 void AudioInputRendererHost::OnCreateStream(
     int stream_id, const media::AudioParameters& params,
     const std::string& device_id, bool automatic_gain_control) {
   VLOG(1) << "AudioInputRendererHost::OnCreateStream(stream_id="
           << stream_id << ")";
   DCHECK(BrowserThread::CurrentlyOn(BrowserThread::IO));
   DCHECK(LookupById(stream_id) == NULL);
 
@@ skipping 136 matching lines @@
         stream_id, media::AudioInputIPCDelegate::kStopped));
   }
 
   // Delete the session entry.
   session_entries_.erase(it);
 }
 
 void AudioInputRendererHost::StopAndDeleteDevice(int session_id) {
   DCHECK(BrowserThread::CurrentlyOn(BrowserThread::IO));
 
-  media_stream_manager_->audio_input_device_manager()->Stop(session_id);
+  media_stream_manager_->GetAudioInputDeviceManager(
+      content::MEDIA_DEVICE_AUDIO_CAPTURE)->Stop(session_id);
 
   // Delete the session entry.
   session_entries_.erase(session_id);
 }
 
 void AudioInputRendererHost::CloseAndDeleteStream(AudioEntry* entry) {
   DCHECK(BrowserThread::CurrentlyOn(BrowserThread::IO));
 
   if (!entry->pending_close) {
     entry->controller->Close(base::Bind(&AudioInputRendererHost::DeleteEntry,
@@ skipping 49 matching lines @@
   DCHECK(BrowserThread::CurrentlyOn(BrowserThread::IO));
 
   for (SessionEntryMap::iterator it = session_entries_.begin();
        it != session_entries_.end(); ++it) {
     if (stream_id == it->second) {
       return it->first;
     }
   }
   return 0;
 }