Fix latency plumbing in media::VirtualAudio[Input|Output]Stream.

media/audio/virtual_audio_input_stream.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/virtual_audio_input_stream.h"
 
 #include <algorithm>
 #include <utility>
 
 #include "base/bind.h"
@@ skipping 20 matching lines @@
     audio_converter_.AddInput(input);
   }
 
   void RemoveInput(AudioConverter::InputCallback* input) {
     audio_converter_.RemoveInput(input);
   }
 
  private:
   double ProvideInput(AudioBus* audio_bus,
                       base::TimeDelta buffer_delay) override {
-    audio_converter_.Convert(audio_bus);
+    audio_converter_.ConvertWithDelay(buffer_delay, audio_bus);
     return 1.0;
   }
 
   AudioConverter audio_converter_;
 
   DISALLOW_COPY_AND_ASSIGN(LoopbackAudioConverter);
 };
 
 VirtualAudioInputStream::VirtualAudioInputStream(
     const AudioParameters& params,
@@ skipping 78 matching lines @@
 
   --num_attached_output_streams_;
   DCHECK_LE(0, num_attached_output_streams_);
 }
 
 void VirtualAudioInputStream::PumpAudio(AudioBus* audio_bus) {
   DCHECK(worker_task_runner_->BelongsToCurrentThread());
 
   {
     base::AutoLock scoped_lock(converter_network_lock_);
-    mixer_.Convert(audio_bus);
+    // Because the audio is being looped-back, the delay until it will be played
+    // out is zero.
+    mixer_.ConvertWithDelay(base::TimeDelta(), audio_bus);
   }
-  callback_->OnData(this, audio_bus, params_.GetBytesPerBuffer(), 1.0);
+  // Because the audio is being looped-back, the delay since since it was
+  // recorded is zero.
+  callback_->OnData(this, audio_bus, 0, 1.0);
 }
 
 void VirtualAudioInputStream::Close() {
   DCHECK(thread_checker_.CalledOnValidThread());
 
   Stop();  // Make sure callback_ is no longer being used.
 
   // If a non-null AfterCloseCallback was provided to the constructor, invoke it
   // here.  The callback is moved to a stack-local first since |this| could be
   // destroyed during Run().
@@ skipping 18 matching lines @@
 
 bool VirtualAudioInputStream::GetAutomaticGainControl() {
   return false;
 }
 
 bool VirtualAudioInputStream::IsMuted() {
   return false;
 }
 
 }  // namespace media