Implementation of ppapi audio.

webkit/plugins/ppapi/audio_helper.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 "ppapi/c/pp_completion_callback.h"
+#include "webkit/plugins/ppapi/audio_helper.h"
+#include "webkit/plugins/ppapi/common.h"
+#include "webkit/plugins/ppapi/resource_helper.h"
+
+namespace webkit {
+namespace ppapi {
+
+// AudioHelper ------------------------------------------------
+
+AudioHelper::AudioHelper()
+    :  create_callback_pending_(false),
+       shared_memory_size_for_create_callback_(0) {
+    create_callback_ = PP_MakeCompletionCallback(NULL, NULL);
+}
+
+AudioHelper::~AudioHelper() {
+  // If the completion callback hasn't fired yet, do so here
+  // with an error condition.
+  if (create_callback_pending_) {
+    PP_RunCompletionCallback(&create_callback_, PP_ERROR_ABORTED);
+    create_callback_pending_ = false;
+  }
+}
+
+int32_t AudioHelper::GetSyncSocket(int* sync_socket) {
+  if (socket_for_create_callback_.get()) {
+#if defined(OS_POSIX)
+    *sync_socket = socket_for_create_callback_->handle();
+#elif defined(OS_WIN)
+    *sync_socket = reinterpret_cast<int>(socket_for_create_callback_->handle());
+#else
+    #error "Platform not supported."
+#endif
+    return PP_OK;
+  }
+  return PP_ERROR_FAILED;
+}
+
+int32_t AudioHelper::GetSharedMemory(int* shm_handle,
+                                             uint32_t* shm_size) {
+  if (shared_memory_for_create_callback_.get()) {
+#if defined(OS_POSIX)
+    *shm_handle = shared_memory_for_create_callback_->handle().fd;
+#elif defined(OS_WIN)
+    *shm_handle = reinterpret_cast<int>(
+        shared_memory_for_create_callback_->handle());
+#else
+    #error "Platform not supported."
+#endif
+    *shm_size = shared_memory_size_for_create_callback_;
+    return PP_OK;
+  }
+  return PP_ERROR_FAILED;
+}
+
+void AudioHelper::StreamCreated_(
+    base::SharedMemoryHandle shared_memory_handle,
+    size_t shared_memory_size,
+    base::SyncSocket::Handle socket_handle) {
+  if (create_callback_pending_) {
+    // Trusted side of proxy can specify a callback to recieve handles. In
+    // this case we don't need to map any data or start the thread since it
+    // will be handled by the proxy.
+    shared_memory_for_create_callback_.reset(
+        new base::SharedMemory(shared_memory_handle, false));
+    shared_memory_size_for_create_callback_ = shared_memory_size;
+    socket_for_create_callback_.reset(new base::SyncSocket(socket_handle));
+
+    PP_RunCompletionCallback(&create_callback_, 0);
+    create_callback_pending_ = false;
+
+    // It might be nice to close the handles here to free up some system
+    // resources, but we can't since there's a race condition. The handles must
+    // be valid until they're sent over IPC, which is done from the I/O thread
+    // which will often get done after this code executes. We could do
+    // something more elaborate like an ACK from the plugin or post a task to
+    // the I/O thread and back, but this extra complexity doesn't seem worth it
+    // just to clean up these handles faster.
+  } else {
+    OnSetStreamInfo(shared_memory_handle, shared_memory_size, socket_handle);
+  }
+}
+
+void AudioHelper::SetCallbackInfo(bool create_callback_pending,
+                                  PP_CompletionCallback create_callback) {
+    create_callback_pending_ = create_callback_pending;
+    create_callback_ = create_callback;
+}
+
+}  // namespace ppapi
+}  // namespace webkit
+