Microphone support for Pepper Flash.

ppapi/shared_impl/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 "ppapi/shared_impl/audio_input_impl.h"
+
+#include "base/logging.h"
+
+namespace ppapi {
+
+AudioInputImpl::AudioInputImpl()
+    : capturing_(false),
+      shared_memory_size_(0),
+      callback_(NULL),
+      user_data_(NULL) {
+}
+
+AudioInputImpl::~AudioInputImpl() {
+  // Closing the socket causes the thread to exit - wait for it.
+  if (socket_.get())
+    socket_->Close();
+  if (audio_input_thread_.get()) {
+    audio_input_thread_->Join();
+    audio_input_thread_.reset();
+  }
+}
+
+void AudioInputImpl::SetCallback(PPB_AudioInput_Callback callback,
+                                 void* user_data) {
+  callback_ = callback;
+  user_data_ = user_data;
+}
+
+void AudioInputImpl::SetStartCaptureState() {
+  DCHECK(!capturing_);
+  DCHECK(!audio_input_thread_.get());
+
+  // If the socket doesn't exist, that means that the plugin has started before
+  // the browser has had a chance to create all the shared memory info and
+  // notify us. This is a common case. In this case, we just set the playing_
+  // flag and the capture will automatically start when that data is available
+  // in SetStreamInfo.
+  if (socket_.get())
+    StartThread();
+  capturing_ = true;
+}
+
+void AudioInputImpl::SetStopCaptureState() {
+  DCHECK(capturing_);
+
+  if (audio_input_thread_.get()) {
+    audio_input_thread_->Join();
+    audio_input_thread_.reset();
+  }
+  capturing_ = false;
+}
+
+void AudioInputImpl::SetStreamInfo(
+    base::SharedMemoryHandle shared_memory_handle,
+    size_t shared_memory_size,
+    base::SyncSocket::Handle socket_handle) {
+  socket_.reset(new base::SyncSocket(socket_handle));
+  shared_memory_.reset(new base::SharedMemory(shared_memory_handle, false));
+  shared_memory_size_ = shared_memory_size;
+
+  if (callback_) {
+    shared_memory_->Map(shared_memory_size_);
+
+    // In common case StartCapture() was called before StreamCreated().
+    if (capturing_)
+      StartThread();
+  }
+}
+
+void AudioInputImpl::StartThread() {
+  DCHECK(callback_);
+  DCHECK(!audio_input_thread_.get());
+  audio_input_thread_.reset(new base::DelegateSimpleThread(
+      this, "plugin_audio_input_thread"));
+  audio_input_thread_->Start();
+}
+
+void AudioInputImpl::Run() {
+  int pending_data;
+  void* buffer = shared_memory_->memory();
+
+  while (sizeof(pending_data) == socket_->Receive(&pending_data,
+                                                  sizeof(pending_data)) &&
+         pending_data >= 0) {
+    callback_(buffer, shared_memory_size_, user_data_);
+  }
+}
+
+}  // namespace ppapi