Modifies AudioInputCallback::OnData and use media::AudioBus instead of plain byte vector

media/audio/audio_input_device.cc

Index: media/audio/audio_input_device.cc
diff --git a/media/audio/audio_input_device.cc b/media/audio/audio_input_device.cc
index f57284c187f7af16f1b0167a404dca3e4bc9c4c1..d56204bc7f726a8f3aff668c17b7859e9e555e71 100644
--- a/media/audio/audio_input_device.cc
+++ b/media/audio/audio_input_device.cc
@@ -297,21 +297,18 @@ void AudioInputDevice::AudioThreadCallback::Process(int pending_data) {
   double volume = buffer->params.volume;
   bool key_pressed = buffer->params.key_pressed;
 
-  int audio_delay_milliseconds = pending_data / bytes_per_ms_;
-  int16* memory = reinterpret_cast<int16*>(&buffer->audio[0]);
-  const int bytes_per_sample = sizeof(memory[0]);
-
-  if (++current_segment_id_ >= total_segments_)
-    current_segment_id_ = 0;
-
-  // Deinterleave each channel and convert to 32-bit floating-point
-  // with nominal range -1.0 -> +1.0.
-  audio_bus_->FromInterleaved(memory, audio_bus_->frames(), bytes_per_sample);
+  // Create audio bus wrapping existing block of shared memory.

[henrika (OOO until Aug 14), 2014/06/04 11:58:50]

...and here.

+  scoped_ptr<AudioBus> audio_bus =
+      AudioBus::WrapMemory(audio_parameters_, &buffer->audio[0]);
 
   // Deliver captured data to the client in floating point format
   // and update the audio-delay measurement.
+  int audio_delay_milliseconds = pending_data / bytes_per_ms_;
   capture_callback_->Capture(
-      audio_bus_.get(), audio_delay_milliseconds, volume, key_pressed);
+      audio_bus.get(), audio_delay_milliseconds, volume, key_pressed);
+
+  if (++current_segment_id_ >= total_segments_)
+    current_segment_id_ = 0;
 }
 
 }  // namespace media