Switch AudioRenderSink::Callback to use AudioBus.

media/base/fake_audio_render_callback.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.
 
 // MSVC++ requires this to be set before any other includes to get M_PI.
 #define _USE_MATH_DEFINES
 
 #include "media/base/fake_audio_render_callback.h"
 
 #include <cmath>
 
 namespace media {
 
 FakeAudioRenderCallback::FakeAudioRenderCallback(double step)
     : half_fill_(false),
       step_(step) {
   reset();
 }
 
 FakeAudioRenderCallback::~FakeAudioRenderCallback() {}
 
-int FakeAudioRenderCallback::Render(const std::vector<float*>& audio_data,
-                                    int number_of_frames,
+int FakeAudioRenderCallback::Render(AudioBus* audio_bus,
                                     int audio_delay_milliseconds) {
+  int number_of_frames = audio_bus->frames();
   if (half_fill_)
     number_of_frames /= 2;
 
   // Fill first channel with a sine wave.
   for (int i = 0; i < number_of_frames; ++i)
-    audio_data[0][i] = sin(2 * M_PI * (x_ + step_ * i));
+    audio_bus->channel(0)[i] = sin(2 * M_PI * (x_ + step_ * i));
   x_ += number_of_frames * step_;
 
   // Copy first channel into the rest of the channels.
-  for (size_t i = 1; i < audio_data.size(); ++i)
-    memcpy(audio_data[i], audio_data[0],
-           number_of_frames * sizeof(*audio_data[0]));
+  for (int i = 1; i < audio_bus->channels(); ++i)
+    memcpy(audio_bus->channel(i), audio_bus->channel(0),
+           number_of_frames * sizeof(*audio_bus->channel(i)));
 
   return number_of_frames;
 }
 
 }  // namespace media