PepperPlatformAudioInputImpl: support audio input device selection.

content/renderer/pepper/pepper_platform_audio_input_impl.cc

 // Copyright (c) 2012 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 "content/renderer/pepper/pepper_platform_audio_input_impl.h"
 
 #include "base/bind.h"
 #include "base/logging.h"
 #include "base/message_loop_proxy.h"
 #include "build/build_config.h"
 #include "content/common/child_process.h"
 #include "content/common/media/audio_messages.h"
+#include "content/renderer/pepper/pepper_plugin_delegate_impl.h"
 #include "content/renderer/render_thread_impl.h"
 #include "media/audio/audio_manager_base.h"
 
 PepperPlatformAudioInputImpl::PepperPlatformAudioInputImpl()
     : client_(NULL),
       stream_id_(0),
-      main_message_loop_proxy_(base::MessageLoopProxy::current()) {
+      main_message_loop_proxy_(base::MessageLoopProxy::current()),
+      shutdown_called_(false) {
   filter_ = RenderThreadImpl::current()->audio_input_message_filter();
 }
 
 PepperPlatformAudioInputImpl::~PepperPlatformAudioInputImpl() {
-  // Make sure we have been shut down. Warning: this will usually happen on
-  // the I/O thread!
+  // Make sure we have been shut down. Warning: this may happen on the I/O
+  // thread!
+  // Although these members should be accessed on a specific thread (either the
+  // main thread or the I/O thread), it should be fine to examine their value
+  // here.
   DCHECK_EQ(0, stream_id_);
   DCHECK(!client_);
+  DCHECK(label_.empty());
+  DCHECK(shutdown_called_);
 }
 
 // static
 PepperPlatformAudioInputImpl* PepperPlatformAudioInputImpl::Create(
+    const base::WeakPtr<PepperPluginDelegateImpl>& plugin_delegate,
+    const std::string& device_id,
     int sample_rate,
     int frames_per_buffer,
-    webkit::ppapi::PluginDelegate::PlatformAudioCommonClient* client) {
+    webkit::ppapi::PluginDelegate::PlatformAudioInputClient* client) {
   scoped_refptr<PepperPlatformAudioInputImpl> audio_input(
       new PepperPlatformAudioInputImpl);
-  if (audio_input->Initialize(sample_rate, frames_per_buffer, client)) {
+  if (audio_input->Initialize(plugin_delegate, device_id, sample_rate,
+                              frames_per_buffer, client)) {
     // Balanced by Release invoked in
     // PepperPlatformAudioInputImpl::ShutDownOnIOThread().
     return audio_input.release();
   }
   return NULL;
 }
 
-bool PepperPlatformAudioInputImpl::StartCapture() {
+void PepperPlatformAudioInputImpl::StartCapture() {
+  DCHECK(main_message_loop_proxy_->BelongsToCurrentThread());
+
   ChildProcess::current()->io_message_loop()->PostTask(
-    FROM_HERE,
-    base::Bind(&PepperPlatformAudioInputImpl::StartCaptureOnIOThread, this));
-  return true;
+      FROM_HERE,
+      base::Bind(&PepperPlatformAudioInputImpl::StartCaptureOnIOThread, this));
 }
 
-bool PepperPlatformAudioInputImpl::StopCapture() {
+void PepperPlatformAudioInputImpl::StopCapture() {
+  DCHECK(main_message_loop_proxy_->BelongsToCurrentThread());
+
   ChildProcess::current()->io_message_loop()->PostTask(
-    FROM_HERE,
-    base::Bind(&PepperPlatformAudioInputImpl::StopCaptureOnIOThread, this));
-  return true;
+      FROM_HERE,
+      base::Bind(&PepperPlatformAudioInputImpl::StopCaptureOnIOThread, this));
 }
 
 void PepperPlatformAudioInputImpl::ShutDown() {
+  DCHECK(main_message_loop_proxy_->BelongsToCurrentThread());
+
   // Called on the main thread to stop all audio callbacks. We must only change
   // the client on the main thread, and the delegates from the I/O thread.
   client_ = NULL;
   ChildProcess::current()->io_message_loop()->PostTask(
       FROM_HERE,
       base::Bind(&PepperPlatformAudioInputImpl::ShutDownOnIOThread, this));
 }
 
 bool PepperPlatformAudioInputImpl::Initialize(
+    const base::WeakPtr<PepperPluginDelegateImpl>& plugin_delegate,
+    const std::string& device_id,
     int sample_rate,
     int frames_per_buffer,
-    webkit::ppapi::PluginDelegate::PlatformAudioCommonClient* client) {
-  DCHECK(client);
-  // Make sure we don't call init more than once.
-  DCHECK_EQ(0, stream_id_);
+    webkit::ppapi::PluginDelegate::PlatformAudioInputClient* client) {
+  DCHECK(main_message_loop_proxy_->BelongsToCurrentThread());
 
+  if (!plugin_delegate || !client)
+    return false;
+
+  plugin_delegate_ = plugin_delegate;
   client_ = client;
 
-  AudioParameters params(AudioParameters::AUDIO_PCM_LINEAR,
-                         CHANNEL_LAYOUT_MONO,
-                         sample_rate, 16, frames_per_buffer);
+  params_.Reset(AudioParameters::AUDIO_PCM_LINEAR, CHANNEL_LAYOUT_MONO,
+                sample_rate, 16, frames_per_buffer);
 
-  ChildProcess::current()->io_message_loop()->PostTask(
-      FROM_HERE,
-      base::Bind(&PepperPlatformAudioInputImpl::InitializeOnIOThread,
-                 this, params));
+  if (device_id.empty()) {
+    // Use the default device.
+    ChildProcess::current()->io_message_loop()->PostTask(
+        FROM_HERE,
+        base::Bind(&PepperPlatformAudioInputImpl::InitializeOnIOThread,
+                   this, 0));
+  } else {
+    // We need to open the device and obtain the label and session ID before
+    // initializing.
+    plugin_delegate_->OpenDevice(
+        PP_DEVICETYPE_DEV_AUDIOCAPTURE, device_id,
+        base::Bind(&PepperPlatformAudioInputImpl::OnDeviceOpened, this));
+  }
   return true;
 }
 
-void PepperPlatformAudioInputImpl::InitializeOnIOThread(
-    const AudioParameters& params) {
+void PepperPlatformAudioInputImpl::InitializeOnIOThread(int session_id) {
+  DCHECK(ChildProcess::current()->io_message_loop_proxy()->
+      BelongsToCurrentThread());
+
+  if (shutdown_called_)
+    return;
+
+  // Make sure we don't call init more than once.
+  DCHECK_EQ(0, stream_id_);
   stream_id_ = filter_->AddDelegate(this);
-  filter_->Send(new AudioInputHostMsg_CreateStream(
-      stream_id_, params, AudioManagerBase::kDefaultDeviceId));
+  DCHECK_NE(0, stream_id_);
+
+  if (!session_id) {
+    // We will be notified by OnStreamCreated().
+    filter_->Send(new AudioInputHostMsg_CreateStream(
+        stream_id_, params_, AudioManagerBase::kDefaultDeviceId));
+  } else {
+    // We will be notified by OnDeviceReady().
+    filter_->Send(new AudioInputHostMsg_StartDevice(stream_id_, session_id));
+  }
 }
 
 void PepperPlatformAudioInputImpl::StartCaptureOnIOThread() {
+  DCHECK(ChildProcess::current()->io_message_loop_proxy()->
+      BelongsToCurrentThread());
+
   if (stream_id_)
     filter_->Send(new AudioInputHostMsg_RecordStream(stream_id_));
 }
 
 void PepperPlatformAudioInputImpl::StopCaptureOnIOThread() {
+  DCHECK(ChildProcess::current()->io_message_loop_proxy()->
+      BelongsToCurrentThread());
+
+  // TODO(yzshen): We cannot re-start capturing if the stream is closed.
   if (stream_id_)
     filter_->Send(new AudioInputHostMsg_CloseStream(stream_id_));
 }
 
 void PepperPlatformAudioInputImpl::ShutDownOnIOThread() {
+  DCHECK(ChildProcess::current()->io_message_loop_proxy()->
+      BelongsToCurrentThread());
+
   // Make sure we don't call shutdown more than once.
-  if (!stream_id_)
+  if (shutdown_called_)
     return;
+  shutdown_called_ = true;
 
-  filter_->Send(new AudioInputHostMsg_CloseStream(stream_id_));
-  filter_->RemoveDelegate(stream_id_);
-  stream_id_ = 0;
+  if (stream_id_) {
+    filter_->Send(new AudioInputHostMsg_CloseStream(stream_id_));
+    filter_->RemoveDelegate(stream_id_);
+    stream_id_ = 0;
+  }
+
+  main_message_loop_proxy_->PostTask(
+      FROM_HERE,
+      base::Bind(&PepperPlatformAudioInputImpl::CloseDevice, this));
 
   Release();  // Release for the delegate, balances out the reference taken in
               // PepperPluginDelegateImpl::CreateAudioInput.
 }
 
 void PepperPlatformAudioInputImpl::OnStreamCreated(
     base::SharedMemoryHandle handle,
     base::SyncSocket::Handle socket_handle,
     uint32 length) {
 #if defined(OS_WIN)
   DCHECK(handle);
   DCHECK(socket_handle);
 #else
   DCHECK_NE(-1, handle.fd);
   DCHECK_NE(-1, socket_handle);
 #endif
   DCHECK(length);
 
-  if (base::MessageLoopProxy::current() == main_message_loop_proxy_) {
-    // Must dereference the client only on the main thread. Shutdown may have
-    // occurred while the request was in-flight, so we need to NULL check.
-    if (client_)
-      client_->StreamCreated(handle, length, socket_handle);
-  } else {
+  if (base::MessageLoopProxy::current() != main_message_loop_proxy_) {
+    // No need to check |shutdown_called_| here. If shutdown has occurred,
+    // |client_| will be NULL and the handles will be cleaned up on the main
+    // thread.
     main_message_loop_proxy_->PostTask(
         FROM_HERE,
         base::Bind(&PepperPlatformAudioInputImpl::OnStreamCreated, this,
                    handle, socket_handle, length));
+  } else {
+    // Must dereference the client only on the main thread. Shutdown may have
+    // occurred while the request was in-flight, so we need to NULL check.
+    if (client_) {
+      client_->StreamCreated(handle, length, socket_handle);
+    } else {
+      // Clean up the handles.
+      base::SyncSocket temp_socket(socket_handle);
+      base::SharedMemory temp_shared_memory(handle, false);
+    }
   }
 }
 
 void PepperPlatformAudioInputImpl::OnVolume(double volume) {
 }
 
 void PepperPlatformAudioInputImpl::OnStateChanged(AudioStreamState state) {
 }
 
-void PepperPlatformAudioInputImpl::OnDeviceReady(const std::string&) {
+void PepperPlatformAudioInputImpl::OnDeviceReady(const std::string& device_id) {
+  DCHECK(ChildProcess::current()->io_message_loop_proxy()->
+      BelongsToCurrentThread());
+
+  if (shutdown_called_)
+    return;
+
+  if (device_id.empty()) {
+    main_message_loop_proxy_->PostTask(
+        FROM_HERE,
+        base::Bind(&PepperPlatformAudioInputImpl::NotifyStreamCreationFailed,
+                   this));
+  } else {
+    // We will be notified by OnStreamCreated().
+    filter_->Send(new AudioInputHostMsg_CreateStream(stream_id_, params_,
+                                                     device_id));
+  }
 }
+
+void PepperPlatformAudioInputImpl::OnDeviceOpened(int request_id,
+                                                  bool succeeded,
+                                                  const std::string& label) {
+  DCHECK(main_message_loop_proxy_->BelongsToCurrentThread());
+
+  if (succeeded && plugin_delegate_) {
+    DCHECK(!label.empty());
+    label_ = label;
+
+    if (client_) {
+      int session_id = plugin_delegate_->GetSessionID(
+          PP_DEVICETYPE_DEV_AUDIOCAPTURE, label);
+      ChildProcess::current()->io_message_loop()->PostTask(
+          FROM_HERE,
+          base::Bind(&PepperPlatformAudioInputImpl::InitializeOnIOThread,
+                     this, session_id));
+    } else {
+      // Shutdown has occurred.
+      CloseDevice();
+    }
+  } else {
+    NotifyStreamCreationFailed();
+  }
+}
+
+void PepperPlatformAudioInputImpl::CloseDevice() {
+  DCHECK(main_message_loop_proxy_->BelongsToCurrentThread());
+
+  if (plugin_delegate_ && !label_.empty()) {
+    plugin_delegate_->CloseDevice(label_);
+    label_.clear();
+  }
+}
+
+void PepperPlatformAudioInputImpl::NotifyStreamCreationFailed() {
+  DCHECK(main_message_loop_proxy_->BelongsToCurrentThread());
+
+  if (client_)
+    client_->StreamCreationFailed();
+}