Switch audio synchronization from sleep() based to select() based.

ppapi/proxy/audio_input_resource.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 "ppapi/proxy/audio_input_resource.h"
 
 #include "base/bind.h"
 #include "base/logging.h"
 #include "ipc/ipc_platform_file.h"
 #include "media/audio/audio_parameters.h"
-#include "media/audio/shared_memory_util.h"
 #include "ppapi/c/pp_errors.h"
 #include "ppapi/proxy/ppapi_messages.h"
 #include "ppapi/proxy/resource_message_params.h"
 #include "ppapi/proxy/serialized_handle.h"
 #include "ppapi/shared_impl/ppapi_globals.h"
 #include "ppapi/shared_impl/ppb_audio_config_shared.h"
 #include "ppapi/shared_impl/resource_tracker.h"
 #include "ppapi/shared_impl/tracked_callback.h"
 #include "ppapi/thunk/enter.h"
 #include "ppapi/thunk/ppb_audio_config_api.h"
@@ skipping 139 matching lines @@
         IPC::InvalidPlatformFileForTransit();
     params.TakeSocketHandleAtIndex(0, &socket_handle_for_transit);
     base::SyncSocket::Handle socket_handle =
         IPC::PlatformFileForTransitToPlatformFile(socket_handle_for_transit);
     CHECK(socket_handle != base::SyncSocket::kInvalidHandle);
 
     SerializedHandle serialized_shared_memory_handle =
         params.TakeHandleOfTypeAtIndex(1, SerializedHandle::SHARED_MEMORY);
     CHECK(serialized_shared_memory_handle.IsHandleValid());
 
-    // See the comment in pepper_audio_input_host.cc about how we must call
-    // TotalSharedMemorySizeInBytes to get the actual size of the buffer. Here,
-    // we must call PacketSizeInBytes to get back the size of the audio buffer,
-    // excluding the bytes that audio uses for book-keeping.
-    size_t shared_memory_size = media::PacketSizeInBytes(
-        serialized_shared_memory_handle.size());
-
     open_state_ = OPENED;
-    SetStreamInfo(serialized_shared_memory_handle.shmem(), shared_memory_size,
+    SetStreamInfo(serialized_shared_memory_handle.shmem(),
+                  serialized_shared_memory_handle.size(),
                   socket_handle);
   } else {
     capturing_ = false;
   }
 
   // The callback may have been aborted by Close().
   if (TrackedCallback::IsPending(open_callback_))
     open_callback_->Run(params.result());
 }
 
@@ skipping 115 matching lines @@
       device_id, enter_config.object()->GetSampleRate(),
       enter_config.object()->GetSampleFrameCount());
   Call<PpapiPluginMsg_AudioInput_OpenReply>(
       RENDERER, msg,
       base::Bind(&AudioInputResource::OnPluginMsgOpenReply,
                  base::Unretained(this)));
   return PP_OK_COMPLETIONPENDING;
 }
 }  // namespace proxy
 }  // namespace ppapi