Support configuring the audio buffer duration in the Pepper MediaStream API.

content/renderer/pepper/pepper_media_stream_track_host_base.cc

 // Copyright 2014 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/pepper/pepper_media_stream_track_host_base.h"
 
 #include "base/logging.h"
 #include "base/numerics/safe_math.h"
 #include "content/public/renderer/render_thread.h"
 #include "content/public/renderer/renderer_ppapi_host.h"
@@ skipping 20 matching lines @@
 PepperMediaStreamTrackHostBase::~PepperMediaStreamTrackHostBase() {}
 
 bool PepperMediaStreamTrackHostBase::InitBuffers(int32_t number_of_buffers,
                                                  int32_t buffer_size,
                                                  TrackType track_type) {
   DCHECK_GT(number_of_buffers, 0);
   DCHECK_GT(buffer_size,
             static_cast<int32_t>(sizeof(ppapi::MediaStreamBuffer::Header)));
   // Make each buffer 4 byte aligned.
   base::CheckedNumeric<int32_t> buffer_size_aligned = buffer_size;
+  // TODO(amistry): "buffer size" might not == "buffer stride", in the same way
+  // that width != stride in an image buffer.
   buffer_size_aligned += (4 - buffer_size % 4);
 
   // TODO(penghuang): |HostAllocateSharedMemoryBuffer| uses sync IPC. We should
   // avoid it.
   base::CheckedNumeric<int32_t> size = number_of_buffers * buffer_size_aligned;
   if (!size.IsValid())
     return false;
 
   content::RenderThread* render_thread = content::RenderThread::Get();
   scoped_ptr<base::SharedMemory> shm(
@@ skipping 64 matching lines @@
   return PP_OK;
 }
 
 int32_t PepperMediaStreamTrackHostBase::OnHostMsgClose(
     HostMessageContext* context) {
   OnClose();
   return PP_OK;
 }
 
 }  // namespace content