Add groupid for media devices. Group audio devices.

media/audio/audio_manager_base.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 "media/audio/audio_manager_base.h"
 
 #include "base/bind.h"
 #include "base/bind_helpers.h"
 #include "base/command_line.h"
 #include "base/macros.h"
@@ skipping 327 matching lines @@
     const std::string& device_id) {
   NOTREACHED();
   return AudioParameters();
 }
 
 std::string AudioManagerBase::GetAssociatedOutputDeviceID(
     const std::string& input_device_id) {
   return "";
 }
 
+std::string AudioManagerBase::GetGroupIDOutput(
+    const std::string& output_device_id) {
+  if (output_device_id == AudioDeviceDescription::kDefaultDeviceId) {
+    std::string real_device_id = GetDefaultOutputDeviceID();
+    if (!real_device_id.empty()) {
+      return real_device_id;
+    }
+  }
+  return output_device_id;
+}
+
+std::string AudioManagerBase::GetGroupIDInput(
+    const std::string& input_device_id) {
+  std::string output_device_id = GetAssociatedOutputDeviceID(input_device_id);
+  if (output_device_id.empty()) {
+    // Some characters are added to avoid accidentally
+    // giving the input the same group id as an output.
+    return input_device_id + "input";
+  }
+  return GetGroupIDOutput(output_device_id);
+}
+
 std::string AudioManagerBase::GetDefaultOutputDeviceID() {
   return "";
 }
 
 int AudioManagerBase::GetUserBufferSize() {
   const base::CommandLine* cmd_line = base::CommandLine::ForCurrentProcess();
   int buffer_size = 0;
   std::string buffer_size_str(cmd_line->GetSwitchValueASCII(
       switches::kAudioBufferSize));
   if (base::StringToInt(buffer_size_str, &buffer_size) && buffer_size > 0)
     return buffer_size;
 
   return 0;
 }
 
 std::unique_ptr<AudioLog> AudioManagerBase::CreateAudioLog(
     AudioLogFactory::AudioComponent component) {
   return audio_log_factory_->CreateAudioLog(component);
 }
 
 }  // namespace media