Upgrade AudioBus to support wrapping, interleaving.

media/base/audio_renderer_mixer.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/base/audio_renderer_mixer.h"
 
 #if defined(ARCH_CPU_X86_FAMILY) && defined(__SSE__)
 #include <xmmintrin.h>
 #endif
 
@@ skipping 102 matching lines @@
     int frames_filled = input->callback()->Render(
         mixer_input_audio_bus_.get(), current_audio_delay_milliseconds_);
     if (frames_filled == 0)
       continue;
 
     // Volume adjust and mix each mixer input into |audio_bus| after rendering.
     for (int i = 0; i < audio_bus->channels(); ++i) {
        VectorFMAC(mixer_input_audio_bus_->channel(i), volume, frames_filled,
                   audio_bus->channel(i));
     }
-
-    // No need to clamp values as InterleaveFloatToInt() will take care of this
-    // for us later when data is transferred to the browser process.
   }
 }
 
 void AudioRendererMixer::OnRenderError() {
   base::AutoLock auto_lock(mixer_inputs_lock_);
 
   // Call each mixer input and signal an error.
   for (AudioRendererMixerInputSet::iterator it = mixer_inputs_.begin();
        it != mixer_inputs_.end(); ++it) {
     (*it)->callback()->OnRenderError();
@@ skipping 36 matching lines @@
                  _mm_mul_ps(_mm_load_ps(src + i), m_scale)));
   }
 
   // Handle any remaining values that wouldn't fit in an SSE pass.
   if (rem)
     VectorFMAC_C(src + len - rem, scale, rem, dest + len - rem);
 }
 #endif
 
 }  // namespace media