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      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/renderer/pepper/common.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 
     21 AudioHelper::~AudioHelper() {
     22 }
     23 
     24 int32_t AudioHelper::GetSyncSocketImpl(int* sync_socket) {
     25   if (socket_for_create_callback_) {
     26 #if defined(OS_POSIX)
     27     *sync_socket = socket_for_create_callback_->handle();
     28 #elif defined(OS_WIN)
     29     *sync_socket = reinterpret_cast<int>(socket_for_create_callback_->handle());
     30 #else
     31     #error "Platform not supported."
     32 #endif
     33     return PP_OK;
     34   }
     35   return PP_ERROR_FAILED;
     36 }
     37 
     38 int32_t AudioHelper::GetSharedMemoryImpl(int* shm_handle, uint32_t* shm_size) {
     39   if (shared_memory_for_create_callback_) {
     40 #if defined(OS_POSIX)
     41     *shm_handle = shared_memory_for_create_callback_->handle().fd;
     42 #elif defined(OS_WIN)
     43     *shm_handle = reinterpret_cast<int>(
     44         shared_memory_for_create_callback_->handle());
     45 #else
     46     #error "Platform not supported."
     47 #endif
     48     *shm_size = shared_memory_size_for_create_callback_;
     49     return PP_OK;
     50   }
     51   return PP_ERROR_FAILED;
     52 }
     53 
     54 void AudioHelper::StreamCreated(
     55     base::SharedMemoryHandle shared_memory_handle,
     56     size_t shared_memory_size,
     57     base::SyncSocket::Handle socket_handle) {
     58   if (TrackedCallback::IsPending(create_callback_)) {
     59     // Trusted side of proxy can specify a callback to recieve handles. In
     60     // this case we don't need to map any data or start the thread since it
     61     // will be handled by the proxy.
     62     shared_memory_for_create_callback_.reset(
     63         new base::SharedMemory(shared_memory_handle, false));
     64     shared_memory_size_for_create_callback_ = shared_memory_size;
     65     socket_for_create_callback_.reset(new base::SyncSocket(socket_handle));
     66 
     67     create_callback_->Run(PP_OK);
     68 
     69     // It might be nice to close the handles here to free up some system
     70     // resources, but we can't since there's a race condition. The handles must
     71     // be valid until they're sent over IPC, which is done from the I/O thread
     72     // which will often get done after this code executes. We could do
     73     // something more elaborate like an ACK from the plugin or post a task to
     74     // the I/O thread and back, but this extra complexity doesn't seem worth it
     75     // just to clean up these handles faster.
     76   } else {
     77     OnSetStreamInfo(shared_memory_handle, shared_memory_size, socket_handle);
     78   }
     79 }
     80 
     81 void AudioHelper::SetCreateCallback(
     82     scoped_refptr<ppapi::TrackedCallback> create_callback) {
     83   DCHECK(!TrackedCallback::IsPending(create_callback_));
     84   create_callback_ = create_callback;
     85 }
     86 
     87 }  // namespace content
     88