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

media/audio/alsa/alsa_input.cc

Index: media/audio/alsa/alsa_input.cc
diff --git a/media/audio/alsa/alsa_input.cc b/media/audio/alsa/alsa_input.cc
index 9cde236b59154f221b5242483aa130956692a6c1..0bc9f314d45e260a37d81c8238507c78edc79f46 100644
--- a/media/audio/alsa/alsa_input.cc
+++ b/media/audio/alsa/alsa_input.cc
@@ -43,7 +43,9 @@ AlsaPcmInputStream::AlsaPcmInputStream(AudioManagerBase* audio_manager,
       mixer_handle_(NULL),
       mixer_element_handle_(NULL),
       read_callback_behind_schedule_(false),
-      weak_factory_(this) {}
+      audio_bus_(AudioBus::Create(params)),
+      weak_factory_(this) {
+}
 
 AlsaPcmInputStream::~AlsaPcmInputStream() {}
 
@@ -208,8 +210,11 @@ void AlsaPcmInputStream::ReadAudio() {
     int frames_read = wrapper_->PcmReadi(device_handle_, audio_buffer_.get(),
                                          params_.frames_per_buffer());
     if (frames_read == params_.frames_per_buffer()) {
-      callback_->OnData(this, audio_buffer_.get(), bytes_per_buffer_,
-                        hardware_delay_bytes, normalized_volume);
+      audio_bus_->FromInterleaved(audio_buffer_.get(),
+                                  audio_bus_->frames(),
+                                  params_.bits_per_sample() / 8);
+      callback_->OnData(
+          this, audio_bus_.get(), hardware_delay_bytes, normalized_volume);
     } else {
       LOG(WARNING) << "PcmReadi returning less than expected frames: "
                    << frames_read << " vs. " << params_.frames_per_buffer()