content/renderer/pepper/audio_helper.cc

   1 // Copyright (c) 2012 The Chromium Authors. All rights reserved.
   2 // Use of this source code is governed by a BSD-style license that can be
   3 // found in the LICENSE file.
   4
   5 #include "content/renderer/pepper/audio_helper.h"
   6
   7 #include "base/logging.h"
   8 #include "content/common/pepper_file_util.h"
   9 #include "ppapi/c/pp_completion_callback.h"
  10 #include "ppapi/c/pp_errors.h"
  11
  12 using ppapi::TrackedCallback;
  13
  14 namespace content {
  15
  16 // AudioHelper -----------------------------------------------------------------
  17
  18 AudioHelper::AudioHelper() : shared_memory_size_for_create_callback_(0) {}
  19
  20 AudioHelper::~AudioHelper() {}
  21
  22 int32_t AudioHelper::GetSyncSocketImpl(int* sync_socket) {
  23   if (socket_for_create_callback_) {
  24     *sync_socket = IntegerFromSyncSocketHandle(
  25         socket_for_create_callback_->handle());
  26     return PP_OK;
  27   }
  28   return PP_ERROR_FAILED;
  29 }
  30
  31 int32_t AudioHelper::GetSharedMemoryImpl(int* shm_handle, uint32_t* shm_size) {
  32   if (shared_memory_for_create_callback_) {
  33     *shm_handle = reinterpret_cast<int>(PlatformFileFromSharedMemoryHandle(
  34         shared_memory_for_create_callback_->handle()));
  35     *shm_size = shared_memory_size_for_create_callback_;
  36     return PP_OK;
  37   }
  38   return PP_ERROR_FAILED;
  39 }
  40
  41 void AudioHelper::StreamCreated(base::SharedMemoryHandle shared_memory_handle,
  42                                 size_t shared_memory_size,
  43                                 base::SyncSocket::Handle socket_handle) {
  44   if (TrackedCallback::IsPending(create_callback_)) {
  45     // Trusted side of proxy can specify a callback to receive handles. In
  46     // this case we don't need to map any data or start the thread since it
  47     // will be handled by the proxy.
  48     shared_memory_for_create_callback_.reset(
  49         new base::SharedMemory(shared_memory_handle, false));
  50     shared_memory_size_for_create_callback_ = shared_memory_size;
  51     socket_for_create_callback_.reset(new base::SyncSocket(socket_handle));
  52
  53     create_callback_->Run(PP_OK);
  54
  55     // It might be nice to close the handles here to free up some system
  56     // resources, but we can't since there's a race condition. The handles must
  57     // be valid until they're sent over IPC, which is done from the I/O thread
  58     // which will often get done after this code executes. We could do
  59     // something more elaborate like an ACK from the plugin or post a task to
  60     // the I/O thread and back, but this extra complexity doesn't seem worth it
  61     // just to clean up these handles faster.
  62   } else {
  63     OnSetStreamInfo(shared_memory_handle, shared_memory_size, socket_handle);
  64   }
  65 }
  66
  67 void AudioHelper::SetCreateCallback(
  68     scoped_refptr<ppapi::TrackedCallback> create_callback) {
  69   DCHECK(!TrackedCallback::IsPending(create_callback_));
  70   create_callback_ = create_callback;
  71 }
  72
  73 }  // namespace content