Fix muted audio when playback rate != 1.0 or 0.0

content/renderer/media/audio_hardware.cc

 // Copyright (c) 2011 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 "content/renderer/media/audio_hardware.h"
 
 #include "base/logging.h"
 #include "content/common/view_messages.h"
 #include "content/renderer/render_thread_impl.h"
 
@@ skipping 30 matching lines @@
   if (!output_buffer_size) {
     uint32 buffer_size = 0;
     RenderThreadImpl::current()->Send(
         new ViewHostMsg_GetHardwareBufferSize(&buffer_size));
     output_buffer_size = buffer_size;
   }
 
   return output_buffer_size;
 }
 
+size_t GetHighLatencyOutputBufferSize(int sample_rate) {
+  // kNominalBufferSize has been tested on Windows, Mac OS X, and Linux
+  // with the AUDIO_PCM_LINEAR flag.
+  const size_t kNominalBufferSize = 2048;
+
+  if (sample_rate <= 48000)
+    return kNominalBufferSize;
+  else if (sample_rate <= 96000)
+    return kNominalBufferSize * 2;
+
+  return kNominalBufferSize * 4;
+}
+
 uint32 GetInputChannelCount() {
   DCHECK(RenderThreadImpl::current() != NULL);
 
   if (!input_channel_count) {
     uint32 channels = 0;
     RenderThreadImpl::current()->Send(
         new ViewHostMsg_GetHardwareInputChannelCount(&channels));
     input_channel_count = channels;
   }
 
   return input_channel_count;
 }
 
 void ResetCache() {
   DCHECK(RenderThreadImpl::current() != NULL);
 
   output_sample_rate = 0.0;
   input_sample_rate = 0.0;
   output_buffer_size = 0;
   input_channel_count = 0;
 }
 
 }  // namespace audio_hardware