Browser-wide audio mirroring for TabCapture API

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_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.
   scoped_refptr<media::AudioInputController> controller;
@@ skipping 187 matching lines @@
   DCHECK(BrowserThread::CurrentlyOn(BrowserThread::IO));
   DCHECK(LookupById(stream_id) == NULL);
 
   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_MIRROR_BROWSER,
+                       params.channel_layout(), params.sample_rate(),
+                       params.bits_per_sample(), params.frames_per_buffer());
   }
 
   DCHECK_GT(audio_params.frames_per_buffer(), 0);
   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;
 
@@ skipping 200 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