Adds the UserInputMonitor implementation for Mac.

media/audio/audio_input_controller.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_input_controller.h"
 
 #include "base/bind.h"
 #include "base/threading/thread_restrictions.h"
 #include "media/base/limits.h"
 #include "media/base/scoped_histogram_timer.h"
+#include "media/base/user_input_monitor.h"
 
 namespace {
 const int kMaxInputChannels = 2;
 
 // TODO(henrika): remove usage of timers and add support for proper
 // notification of when the input device is removed.  This was originally added
 // to resolve http://crbug.com/79936 for Windows platforms.  This then caused
 // breakage (very hard to repro bugs!) on other platforms: See
 // http://crbug.com/226327 and http://crbug.com/230972.
 const int kTimerResetIntervalSeconds = 1;
@@ skipping 18 matching lines @@
                                            SyncWriter* sync_writer,
                                            UserInputMonitor* user_input_monitor)
     : creator_loop_(base::MessageLoopProxy::current()),
       handler_(handler),
       stream_(NULL),
       data_is_active_(false),
       state_(kEmpty),
       sync_writer_(sync_writer),
       max_volume_(0.0),
       user_input_monitor_(user_input_monitor),
-      key_pressed_(false) {
+      prev_key_down_count_(0) {
   DCHECK(creator_loop_.get());
 }
 
 AudioInputController::~AudioInputController() {
   DCHECK(kClosed == state_ || kCreated == state_ || kEmpty == state_);
 }
 
 // static
 scoped_refptr<AudioInputController> AudioInputController::Create(
     AudioManager* audio_manager,
@@ skipping 174 matching lines @@
 
   if (no_data_timer_) {
     // Start the data timer. Once |kTimerResetIntervalSeconds| have passed,
     // a callback to DoCheckForNoData() is made.
     no_data_timer_->Reset();
   }
 
   stream_->Start(this);
   handler_->OnRecording(this);
 
-  if (user_input_monitor_)
-    user_input_monitor_->AddKeyStrokeListener(this);
+  if (user_input_monitor_) {
+    user_input_monitor_->EnableKeyPressMonitoring();
+    prev_key_down_count_ = user_input_monitor_->GetKeyPressCount();
+  }
 }
 
 void AudioInputController::DoClose() {
   DCHECK(message_loop_->BelongsToCurrentThread());
   SCOPED_UMA_HISTOGRAM_TIMER("Media.AudioInputController.CloseTime");
 
   // Delete the timer on the same thread that created it.
   no_data_timer_.reset();
 
   if (state_ != kClosed) {
     DoStopCloseAndClearStream(NULL);
     SetDataIsActive(false);
 
     if (LowLatencyMode()) {
       sync_writer_->Close();
     }
 
     state_ = kClosed;
 
     if (user_input_monitor_)
-      user_input_monitor_->RemoveKeyStrokeListener(this);
+      user_input_monitor_->DisableKeyPressMonitoring();
   }
 }
 
 void AudioInputController::DoReportError() {
   DCHECK(message_loop_->BelongsToCurrentThread());
   handler_->OnError(this);
 }
 
 void AudioInputController::DoSetVolume(double volume) {
   DCHECK(message_loop_->BelongsToCurrentThread());
@@ skipping 49 matching lines @@
   // |kTimerResetIntervalSeconds|.
   no_data_timer_->Start(
       FROM_HERE, base::TimeDelta::FromSeconds(kTimerResetIntervalSeconds),
       base::Bind(&AudioInputController::DoCheckForNoData,
       base::Unretained(this)));
 }
 
 void AudioInputController::OnData(AudioInputStream* stream, const uint8* data,
                                   uint32 size, uint32 hardware_delay_bytes,
                                   double volume) {
-  bool key_pressed = false;
   {
     base::AutoLock auto_lock(lock_);
     if (state_ != kRecording)
       return;
+  }
 
-    std::swap(key_pressed, key_pressed_);
+  bool key_pressed = false;
+  if (user_input_monitor_) {
+    size_t current_count = user_input_monitor_->GetKeyPressCount();
+    key_pressed = (current_count != prev_key_down_count_);

[Mark Mentovai, 2013/08/23 18:09:03]

Outer (parentheses) are unnecessary.

+    prev_key_down_count_ = current_count;
   }
 
   // Mark data as active to ensure that the periodic calls to
   // DoCheckForNoData() does not report an error to the event handler.
   SetDataIsActive(true);
 
   // Use SyncSocket if we are in a low-latency mode.
   if (LowLatencyMode()) {
     sync_writer_->Write(data, size, volume, key_pressed);
     sync_writer_->UpdateRecordedBytes(hardware_delay_bytes);
     return;
   }
 
   handler_->OnData(this, data, size);
 }
 
 void AudioInputController::OnClose(AudioInputStream* stream) {
   DVLOG(1) << "AudioInputController::OnClose()";
   // TODO(satish): Sometimes the device driver closes the input stream without
   // us asking for it (may be if the device was unplugged?). Check how to handle
   // such cases here.
 }
 
 void AudioInputController::OnError(AudioInputStream* stream) {
   // Handle error on the audio-manager thread.
   message_loop_->PostTask(FROM_HERE, base::Bind(
       &AudioInputController::DoReportError, this));
 }
 
-void AudioInputController::OnKeyStroke() {
-  base::AutoLock auto_lock(lock_);
-  key_pressed_ = true;
-}
-
 void AudioInputController::DoStopCloseAndClearStream(
     base::WaitableEvent* done) {
   DCHECK(message_loop_->BelongsToCurrentThread());
 
   // Allow calling unconditionally and bail if we don't have a stream to close.
   if (stream_ != NULL) {
     stream_->Stop();
     stream_->Close();
     stream_ = NULL;
   }
 
   // Should be last in the method, do not touch "this" from here on.
   if (done != NULL)
     done->Signal();
 }
 
 void AudioInputController::SetDataIsActive(bool enabled) {
   base::subtle::Release_Store(&data_is_active_, enabled);
 }
 
 bool AudioInputController::GetDataIsActive() {
   return (base::subtle::Acquire_Load(&data_is_active_) != false);
 }
 
 }  // namespace media