Tab Audio Mirroring: WebContentsAudioInputStream is a new implementation which represents the lifet…

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/browser/renderer_host/media/web_contents_audio_input_stream.h"
 #include "content/browser/renderer_host/media/web_contents_capture_util.h"
 #include "content/common/media/audio_messages.h"
 
 namespace content {
 
 struct AudioInputRendererHost::AudioEntry {
   AudioEntry();
   ~AudioEntry();
 
   // The AudioInputController that manages the audio input stream.
@@ skipping 163 matching lines @@
     IPC_MESSAGE_HANDLER(AudioInputHostMsg_AssociateStreamWithConsumer,
                         OnAssociateStreamWithConsumer)
     IPC_MESSAGE_HANDLER(AudioInputHostMsg_RecordStream, OnRecordStream)
     IPC_MESSAGE_HANDLER(AudioInputHostMsg_CloseStream, OnCloseStream)
     IPC_MESSAGE_HANDLER(AudioInputHostMsg_SetVolume, OnSetVolume)
     IPC_MESSAGE_UNHANDLED(handled = false)
   IPC_END_MESSAGE_MAP_EX()
 
   return handled;
 }
+
 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);
@@ skipping 11 matching lines @@
     return;
   }
 
   media::AudioParameters audio_params(params);
 
   if (media_stream_manager_->audio_input_device_manager()->
       ShouldUseFakeDevice()) {
     audio_params.Reset(media::AudioParameters::AUDIO_FAKE,
                        params.channel_layout(), params.sample_rate(),
                        params.bits_per_sample(), params.frames_per_buffer());
-  } else if (WebContentsCaptureUtil::IsWebContentsDeviceId(device_id)) {
-    audio_params.Reset(media::AudioParameters::AUDIO_VIRTUAL,
-                       params.channel_layout(), params.sample_rate(),
-                       params.bits_per_sample(), params.frames_per_buffer());
   }
 
   uint32 buffer_size = audio_params.GetBytesPerBuffer();
 
   // Create a new AudioEntry structure.
   scoped_ptr<AudioEntry> entry(new AudioEntry());
 
   uint32 mem_size = sizeof(media::AudioInputBufferParameters) + buffer_size;
 
   // Create the shared memory and share it with the renderer process
   // using a new SyncWriter object.
   if (!entry->shared_memory.CreateAndMapAnonymous(mem_size)) {
     // If creation of shared memory failed then send an error message.
     SendErrorMessage(stream_id);
     return;
   }
 
   scoped_ptr<AudioInputSyncWriter> writer(
       new AudioInputSyncWriter(&entry->shared_memory));
 
   if (!writer->Init()) {
     SendErrorMessage(stream_id);
     return;
   }
 
   // If we have successfully created the SyncWriter then assign it to the
   // entry and construct an AudioInputController.
-  // TODO(henrika): replace CreateLowLatency() with Create() as soon
-  // as satish has ensured that Speech Input also uses the default low-
-  // latency path. See crbug.com/112472 for details.
   entry->writer.reset(writer.release());
-  entry->controller = media::AudioInputController::CreateLowLatency(
-      audio_manager_,
-      this,
-      audio_params,
-      device_id,
-      entry->writer.get());
+  if (WebContentsCaptureUtil::IsWebContentsDeviceId(device_id)) {
+    entry->controller = media::AudioInputController::CreateForStream(
+        audio_manager_,
+        this,
+        WebContentsAudioInputStream::Create(
+            device_id, audio_params, audio_manager_->GetMessageLoop()),
+        entry->writer.get());
+  } else {
+    // TODO(henrika): replace CreateLowLatency() with Create() as soon
+    // as satish has ensured that Speech Input also uses the default low-
+    // latency path. See crbug.com/112472 for details.
+    entry->controller = media::AudioInputController::CreateLowLatency(
+        audio_manager_,
+        this,
+        audio_params,
+        device_id,
+        entry->writer.get());
+  }
 
   if (!entry->controller) {
     SendErrorMessage(stream_id);
     return;
   }
 
   // Set the initial AGC state for the audio input stream. Note that, the AGC
   // is only supported in AUDIO_PCM_LOW_LATENCY mode.
   if (params.format() == media::AudioParameters::AUDIO_PCM_LOW_LATENCY)
     entry->controller->SetAutomaticGainControl(automatic_gain_control);
@@ skipping 170 matching lines @@
   for (SessionEntryMap::iterator it = session_entries_.begin();
        it != session_entries_.end(); ++it) {
     if (stream_id == it->second) {
       return it->first;
     }
   }
   return 0;
 }
 
 }  // namespace content