Implementation of ppapi audio.

webkit/plugins/ppapi/ppb_audio_input_impl.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 "webkit/plugins/ppapi/ppb_audio_input_impl.h"
+
+#include "base/logging.h"
+#include "ppapi/c/pp_completion_callback.h"
+#include "ppapi/c/dev/ppb_audio_input_dev.h"
+#include "ppapi/shared_impl/resource_tracker.h"
+#include "ppapi/shared_impl/tracker_base.h"
+#include "ppapi/thunk/enter.h"
+#include "ppapi/thunk/thunk.h"
+#include "webkit/plugins/ppapi/common.h"
+#include "webkit/plugins/ppapi/resource_helper.h"
+
+using ppapi::thunk::EnterResourceNoLock;
+using ppapi::thunk::PPB_AudioInput_API;
+
+namespace webkit {
+namespace ppapi {
+
+// PPB_AudioInput_Impl --------------------------------------------------------------
+
+PPB_AudioInput_Impl::PPB_AudioInput_Impl(PP_Instance instance)
+    : Resource(instance),
+      audio_input_(NULL),
+      create_callback_pending_(false),
+      shared_memory_size_for_create_callback_(0) {
+  create_callback_ = PP_MakeCompletionCallback(NULL, NULL);
+}
+
+PPB_AudioInput_Impl::~PPB_AudioInput_Impl() {
+  // Calling ShutDown() makes sure StreamCreated cannot be called anymore and
+  // releases the audio data associated with the pointer. Note however, that
+  // until ShutDown returns, StreamCreated may still be called. This will be
+  // OK since we'll just immediately clean up the data it stored later in this
+  // destructor.
+  if (audio_input_) {
+    audio_input_->ShutDown();
+    audio_input_ = NULL;
+  }
+
+  // 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;
+  }
+}
+
+// static
+PP_Resource PPB_AudioInput_Impl::Create(PP_Instance instance,
+                                        PPB_AudioInput_Callback audio_input_callback,
+                                        void* user_data) {
+  scoped_refptr<PPB_AudioInput_Impl> audio_input(new PPB_AudioInput_Impl(instance));
+  if (!audio_input->Init(audio_input_callback, user_data))
+    return 0;
+  return audio_input->GetReference();
+}
+
+PPB_AudioInput_API* PPB_AudioInput_Impl::AsPPB_AudioInput_API() {
+  return this;
+}
+
+bool PPB_AudioInput_Impl::Init(PPB_AudioInput_Callback callback, void* user_data) {
+  // Validate the config and keep a reference to it.
+
+  if (!callback)
+    return false;
+  SetCallback(callback, user_data);
+
+  PluginDelegate* plugin_delegate = ResourceHelper::GetPluginDelegate(this);
+  if (!plugin_delegate)
+    return false;
+
+  // When the stream is created, we'll get called back on StreamCreated().
+  CHECK(!audio_input_);
+  audio_input_ = plugin_delegate->CreateAudioInput(this);
+  return audio_input_ != NULL;
+}
+
+PP_Bool PPB_AudioInput_Impl::StartCapture() {
+  if (!audio_input_)
+    return PP_FALSE;
+  if (capturing())
+    return PP_TRUE;
+  SetStartCaptureState();
+  return BoolToPPBool(audio_input_->StartCapture());
+}
+
+PP_Bool PPB_AudioInput_Impl::StopCapture() {
+  if (!audio_input_)
+    return PP_FALSE;
+  if (!capturing())
+    return PP_TRUE;
+  if (!audio_input_->StopCapture())
+    return PP_FALSE;
+  SetStopCaptureState();
+  return PP_TRUE;
+}
+
+int32_t PPB_AudioInput_Impl::OpenTrusted(PP_CompletionCallback create_callback) {
+  PluginDelegate* plugin_delegate = ResourceHelper::GetPluginDelegate(this);
+  if (!plugin_delegate)
+    return PP_ERROR_FAILED;
+
+  // When the stream is created, we'll get called back on StreamCreated().
+  DCHECK(!audio_input_);
+  audio_input_ = plugin_delegate->CreateAudioInput(this);
+
+  if (!audio_input_)
+    return PP_ERROR_FAILED;
+
+  // At this point, we are guaranteeing ownership of the completion
+  // callback.  Audio promises to fire the completion callback
+  // once and only once.
+  create_callback_ = create_callback;
+  create_callback_pending_ = true;
+  return PP_OK_COMPLETIONPENDING;
+}
+
+int32_t PPB_AudioInput_Impl::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 PPB_AudioInput_Impl::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 PPB_AudioInput_Impl::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 {
+    SetStreamInfo(shared_memory_handle, shared_memory_size, socket_handle);
+  }
+}
+
+}  // namespace ppapi
+}  // namespace webkit