Mojo interfaces needed for switching audio rendering stream creation and closing from IPC to Mojo

content/browser/renderer_host/media/audio_renderer_host.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/browser/renderer_host/media/audio_renderer_host.h"
 
 #include <stdint.h>
 #include <utility>
+#if defined(OS_WIN)
+#include <windows.h>
+#endif
 
 #include "base/bind.h"
 #include "base/bind_helpers.h"
 #include "base/lazy_instance.h"
 #include "base/logging.h"
 #include "base/memory/shared_memory.h"
 #include "base/metrics/histogram.h"
 #include "base/process/process.h"
 #include "content/browser/bad_message.h"
 #include "content/browser/browser_main_loop.h"
 #include "content/browser/child_process_security_policy_impl.h"
+#include "content/browser/media/audio_output_impl.h"
 #include "content/browser/media/audio_stream_monitor.h"
 #include "content/browser/media/capture/audio_mirroring_manager.h"
 #include "content/browser/media/media_internals.h"
 #include "content/browser/renderer_host/media/audio_input_device_manager.h"
 #include "content/browser/renderer_host/media/audio_sync_reader.h"
 #include "content/browser/renderer_host/media/media_stream_manager.h"
 #include "content/browser/renderer_host/media/media_stream_ui_proxy.h"
 #include "content/browser/renderer_host/render_widget_host_impl.h"
 #include "content/common/media/audio_messages.h"
 #include "content/public/browser/content_browser_client.h"
 #include "content/public/browser/media_device_id.h"
 #include "content/public/browser/media_observer.h"
 #include "content/public/browser/render_frame_host.h"
 #include "content/public/common/content_switches.h"
 #include "media/audio/audio_device_name.h"
 #include "media/audio/audio_manager_base.h"
 #include "media/audio/audio_streams_tracker.h"
 #include "media/base/audio_bus.h"
 #include "media/base/limits.h"
+#include "mojo/edk/embedder/embedder.h"
+#include "mojo/public/cpp/system/handle.h"
 
 using media::AudioBus;
 using media::AudioManager;
 
 namespace content {
 
 namespace {
 
 // Tracks the maximum number of simultaneous output streams browser-wide.
 // Accessed on IO thread.
 base::LazyInstance<media::AudioStreamsTracker> g_audio_streams_tracker =
     LAZY_INSTANCE_INITIALIZER;
 
 std::pair<int, std::pair<bool, std::string>> MakeAuthorizationData(
     int stream_id,
     bool authorized,
     const std::string& device_unique_id) {
   return std::make_pair(stream_id,
                         std::make_pair(authorized, device_unique_id));
 }
 
 GURL ConvertToGURL(const url::Origin& origin) {
   return origin.unique() ? GURL() : GURL(origin.Serialize());
 }
 
+base::SyncSocket::TransitDescriptor DuplicateSocket(
+    base::SyncSocket::TransitDescriptor socket_descriptor) {
+  base::SyncSocket::TransitDescriptor socket_descriptor_dup;

[tommi (sloooow) - chröme, 2016/04/26 15:29:53]

Initialize please. As is, you might be returning a  bogus handle on windows.

[rchtara, 2016/04/29 12:54:46]

Done.

+
+#if defined(OS_WIN)
+  ::DuplicateHandle(GetCurrentProcess(),  // hSourceProcessHandle

[tommi (sloooow) - chröme, 2016/04/26 15:29:53]

check the return value?

[rchtara, 2016/04/29 12:54:46]

Done.

+                    socket_descriptor,
+                    GetCurrentProcess(),  // hTargetProcessHandle
+                    &socket_descriptor_dup,
+                    0,  // dwDesiredAccess ignored due to SAME_ACCESS
+                    FALSE,  // !bInheritHandle
+                    DUPLICATE_SAME_ACCESS);
+
+#else
+  socket_descriptor_dup.fd = dup(socket_descriptor.fd);
+#endif
+  return socket_descriptor_dup;
+}
+
 bool IsValidDeviceId(const std::string& device_id) {
   static const std::string::size_type kValidLength = 64;
 
   if (device_id.empty() ||
       device_id == media::AudioManagerBase::kDefaultDeviceId ||
       device_id == media::AudioManagerBase::kCommunicationsDeviceId) {
     return true;
   }
 
   if (device_id.length() != kValidLength)
@@ skipping 45 matching lines @@
 
 class AudioRendererHost::AudioEntry
     : public media::AudioOutputController::EventHandler {
  public:
   AudioEntry(AudioRendererHost* host,
              int stream_id,
              int render_frame_id,
              const media::AudioParameters& params,
              const std::string& output_device_id,
              std::unique_ptr<base::SharedMemory> shared_memory,
-             std::unique_ptr<media::AudioOutputController::SyncReader> reader);
+             std::unique_ptr<media::AudioOutputController::SyncReader> reader,
+             const mojom::AudioOutput::CreateStreamCallback& callback);
   ~AudioEntry() override;
 
   int stream_id() const {
     return stream_id_;
   }
 
   int render_frame_id() const { return render_frame_id_; }
 
   media::AudioOutputController* controller() const { return controller_.get(); }
 
   base::SharedMemory* shared_memory() {
     return shared_memory_.get();
   }
 
   media::AudioOutputController::SyncReader* reader() const {
     return reader_.get();
   }
 
   bool playing() const { return playing_; }
   void set_playing(bool playing) { playing_ = playing; }
 
  private:
   // media::AudioOutputController::EventHandler implementation.
-  void OnCreated() override;
+  void OnCreated(
+      const mojom::AudioOutput::CreateStreamCallback& callback) override;
   void OnPlaying() override;
   void OnPaused() override;
   void OnError() override;
 
   AudioRendererHost* const host_;
   const int stream_id_;
 
   // The routing ID of the source RenderFrame.
   const int render_frame_id_;
 
   // Shared memory for transmission of the audio data.  Used by |reader_|.
   const std::unique_ptr<base::SharedMemory> shared_memory_;
 
   // The synchronous reader to be used by |controller_|.
   const std::unique_ptr<media::AudioOutputController::SyncReader> reader_;
 
   // The AudioOutputController that manages the audio stream.
   const scoped_refptr<media::AudioOutputController> controller_;
 
   bool playing_;
 };
 
 AudioRendererHost::AudioEntry::AudioEntry(
     AudioRendererHost* host,
     int stream_id,
     int render_frame_id,
     const media::AudioParameters& params,
     const std::string& output_device_id,
     std::unique_ptr<base::SharedMemory> shared_memory,
-    std::unique_ptr<media::AudioOutputController::SyncReader> reader)
+    std::unique_ptr<media::AudioOutputController::SyncReader> reader,
+    const mojom::AudioOutput::CreateStreamCallback& callback)
     : host_(host),
       stream_id_(stream_id),
       render_frame_id_(render_frame_id),
       shared_memory_(std::move(shared_memory)),
       reader_(std::move(reader)),
       controller_(media::AudioOutputController::Create(host->audio_manager_,
                                                        this,
                                                        params,
                                                        output_device_id,
-                                                       reader_.get())),
+                                                       reader_.get(),
+                                                       callback)),
       playing_(false) {
   DCHECK(controller_.get());
 }
 
 AudioRendererHost::AudioEntry::~AudioEntry() {}
 
 ///////////////////////////////////////////////////////////////////////////////
 // AudioRendererHost implementations.
 
 AudioRendererHost::AudioRendererHost(
@@ skipping 51 matching lines @@
   }
 
   // Remove any authorizations for streams that were not yet created
   authorizations_.clear();
 }
 
 void AudioRendererHost::OnDestruct() const {
   BrowserThread::DeleteOnIOThread::Destruct(this);
 }
 
-void AudioRendererHost::AudioEntry::OnCreated() {
-  BrowserThread::PostTask(
-      BrowserThread::IO,
-      FROM_HERE,
-      base::Bind(&AudioRendererHost::DoCompleteCreation, host_, stream_id_));
+void AudioRendererHost::AudioEntry::OnCreated(
+    const mojom::AudioOutput::CreateStreamCallback& callback) {
+  BrowserThread::PostTask(BrowserThread::IO, FROM_HERE,
+                          base::Bind(&AudioRendererHost::DoCompleteCreation,
+                                     host_, stream_id_, callback));
 }
 
 void AudioRendererHost::AudioEntry::OnPlaying() {
   BrowserThread::PostTask(
       BrowserThread::IO,
       FROM_HERE,
       base::Bind(&AudioRendererHost::DoNotifyStreamStateChanged,
                  host_,
                  stream_id_,
                  true));
 }
 
 void AudioRendererHost::AudioEntry::OnPaused() {
   BrowserThread::PostTask(
       BrowserThread::IO,
       FROM_HERE,
       base::Bind(&AudioRendererHost::DoNotifyStreamStateChanged,
                  host_,
                  stream_id_,
                  false));
 }
 
 void AudioRendererHost::AudioEntry::OnError() {
   BrowserThread::PostTask(
       BrowserThread::IO,
       FROM_HERE,
       base::Bind(&AudioRendererHost::ReportErrorAndClose, host_, stream_id_));
 }
 
-void AudioRendererHost::DoCompleteCreation(int stream_id) {
+void AudioRendererHost::DoCompleteCreation(
+    int stream_id,
+    const mojom::AudioOutput::CreateStreamCallback& callback) {
   DCHECK_CURRENTLY_ON(BrowserThread::IO);
 
   if (!PeerHandle()) {
     DLOG(WARNING) << "Renderer process handle is invalid.";
-    ReportErrorAndClose(stream_id);
+    ReportErrorAndCloseStream(stream_id, callback);
     return;
   }
 
   AudioEntry* const entry = LookupById(stream_id);
   if (!entry) {
-    ReportErrorAndClose(stream_id);
+    ReportErrorAndCloseStream(stream_id, callback);
     return;
   }
 
-  // Once the audio stream is created then complete the creation process by
-  // mapping shared memory and sharing with the renderer process.
-  base::SharedMemoryHandle foreign_memory_handle;
-  if (!entry->shared_memory()->ShareToProcess(PeerHandle(),
-                                              &foreign_memory_handle)) {
-    // If we failed to map and share the shared memory then close the audio
-    // stream and send an error message.
-    ReportErrorAndClose(entry->stream_id());
+  std::unique_ptr<mojom::AudioOutputStreamPtr> stream_ptr(

[xhwang, 2016/04/26 22:54:42]

AudioOutputStreamPtr is an InterfacePtr which is already move-only. No need for
std::unique_ptr here?

[rchtara, 2016/04/29 12:54:46]

Done.

+      audio_output_impl_->StreamFactory(stream_id, this));
+
+  base::SharedMemoryHandle shared_memory_handle =
+      base::SharedMemory::DuplicateHandle(entry->shared_memory()->handle());
+
+  MojoHandle mojo_foreign_memory_handle;
+
+  MojoResult shared_buffer_result = mojo::edk::CreateSharedBufferWrapper(
+      shared_memory_handle, entry->shared_memory()->requested_size(), false,
+      &mojo_foreign_memory_handle);
+
+  if (shared_buffer_result != MOJO_RESULT_OK) {
+    DLOG(WARNING) << "Failed to wrap transit descriptor. Closing: "
+                 << shared_buffer_result;
+    ReportErrorAndCloseStream(entry->stream_id(), callback);
     return;
   }
 
   AudioSyncReader* reader = static_cast<AudioSyncReader*>(entry->reader());
 
   base::SyncSocket::TransitDescriptor socket_descriptor;
 
   // If we failed to prepare the sync socket for the renderer then we fail
   // the construction of audio stream.
   if (!reader->PrepareForeignSocket(PeerHandle(), &socket_descriptor)) {
-    ReportErrorAndClose(entry->stream_id());
+    ReportErrorAndCloseStream(entry->stream_id(), callback);
+    return;
+  }
+  mojo::ScopedSharedBufferHandle shared_buffer_handle =
+      mojo::ScopedSharedBufferHandle(
+          mojo::SharedBufferHandle(mojo_foreign_memory_handle));
+
+  MojoHandle socket_descriptor_handle;
+  MojoResult platform_handle_result;
+
+  // The socket handle is going to be closed when |mojo_application_host_| is

[Henrik Grunell, 2016/04/22 08:23:04]

Why do we need two handles actually? Only one is used in the end, right? Can it
be passed instead?

[rchtara, 2016/04/29 12:54:46]

yes.
if we dont do that, both mojo and AudioOutputIPCDelegate are going to need to
close the socket descriptor which causes an error.

+  // reset. AudioOutputIPCDelegate is going to need to close the socket handle
+  // too when the steam it controls is closed. This is going to cause an issue
+  // because both of them are going to close the same socket handle.
+  // This is why a duplicate of the socket handler is going to be created,
+  // stored in |socket_descriptor_dup| and sent through Mojo to the renderer so
+  // it can be used by AudioOutputIPCDelegate.
+
+  base::SyncSocket::TransitDescriptor socket_descriptor_dup =
+      DuplicateSocket(socket_descriptor);
+#if defined(OS_WIN)
+  platform_handle_result = mojo::edk::CreatePlatformHandleWrapper(
+      mojo::edk::ScopedPlatformHandle(
+          mojo::edk::PlatformHandle(socket_descriptor_dup),
+      &socket_descriptor_handle);
+#else
+  platform_handle_result = mojo::edk::CreatePlatformHandleWrapper(
+    mojo::edk::ScopedPlatformHandle(
+          mojo::edk::PlatformHandle(socket_descriptor_dup.fd)),
+      &socket_descriptor_handle);
+#endif
+
+  if (platform_handle_result != MOJO_RESULT_OK) {
+    DLOG(WARNING) << "Failed to wrap platform handle. Closing: "
+                 << platform_handle_result;
+    ReportErrorAndCloseStream(stream_id, callback);
     return;
   }
 
-  Send(new AudioMsg_NotifyStreamCreated(
-      entry->stream_id(), foreign_memory_handle, socket_descriptor,
-      entry->shared_memory()->requested_size()));
+  mojo::ScopedHandle socket_handle =
+      mojo::ScopedHandle(mojo::Handle(socket_descriptor_handle));
+  callback.Run(stream_id, std::move(*stream_ptr),
+               std::move(shared_buffer_handle), std::move(socket_handle));
+
 }
 
 void AudioRendererHost::DoNotifyStreamStateChanged(int stream_id,
                                                    bool is_playing) {
   DCHECK_CURRENTLY_ON(BrowserThread::IO);
 
   AudioEntry* const entry = LookupById(stream_id);
   if (!entry)
     return;
 
@@ skipping 30 matching lines @@
   return controllers;
 }
 
 ///////////////////////////////////////////////////////////////////////////////
 // IPC Messages handler
 bool AudioRendererHost::OnMessageReceived(const IPC::Message& message) {
   bool handled = true;
   IPC_BEGIN_MESSAGE_MAP(AudioRendererHost, message)
     IPC_MESSAGE_HANDLER(AudioHostMsg_RequestDeviceAuthorization,
                         OnRequestDeviceAuthorization)
-    IPC_MESSAGE_HANDLER(AudioHostMsg_CreateStream, OnCreateStream)
     IPC_MESSAGE_HANDLER(AudioHostMsg_PlayStream, OnPlayStream)
     IPC_MESSAGE_HANDLER(AudioHostMsg_PauseStream, OnPauseStream)
     IPC_MESSAGE_HANDLER(AudioHostMsg_CloseStream, OnCloseStream)
     IPC_MESSAGE_HANDLER(AudioHostMsg_SetVolume, OnSetVolume)
     IPC_MESSAGE_UNHANDLED(handled = false)
   IPC_END_MESSAGE_MAP()
 
   return handled;
 }
 
@@ skipping 118 matching lines @@
 
   auth_data->second.first = true;
   auth_data->second.second = device_info.unique_id;
 
   media::AudioParameters output_params = device_info.output_params;
   MaybeFixAudioParameters(&output_params);
   Send(new AudioMsg_NotifyDeviceAuthorized(
       stream_id, media::OUTPUT_DEVICE_STATUS_OK, output_params, std::string()));
 }
 
-void AudioRendererHost::OnCreateStream(int stream_id,
-                                       int render_frame_id,
-                                       const media::AudioParameters& params) {
+void AudioRendererHost::CreateStream(
+    int stream_id,
+    int render_frame_id,
+    const media::AudioParameters& params,
+    const mojom::AudioOutput::CreateStreamCallback& callback) {
   DCHECK_CURRENTLY_ON(BrowserThread::IO);
-  DVLOG(1) << "AudioRendererHost@" << this << "::OnCreateStream"
+  DVLOG(1) << "AudioRendererHost@" << this << "::CreateStream"
            << "(stream_id=" << stream_id << ")";
 
   const auto& auth_data = authorizations_.find(stream_id);
 
   // If no previous authorization requested, assume default device
   if (auth_data == authorizations_.end()) {
-    DoCreateStream(stream_id, render_frame_id, params, std::string());
+    DoCreateStream(stream_id, render_frame_id, params, std::string(), callback);
     return;
   }
 
   CHECK(auth_data->second.first);
-  DoCreateStream(stream_id, render_frame_id, params, auth_data->second.second);
+  DoCreateStream(stream_id, render_frame_id, params, auth_data->second.second,
+                 callback);
   authorizations_.erase(auth_data);
 }
 
-void AudioRendererHost::DoCreateStream(int stream_id,
-                                       int render_frame_id,
-                                       const media::AudioParameters& params,
-                                       const std::string& device_unique_id) {
+void AudioRendererHost::DoCreateStream(
+    int stream_id,
+    int render_frame_id,
+    const media::AudioParameters& params,
+    const std::string& device_unique_id,
+    const mojom::AudioOutput::CreateStreamCallback& callback) {
   DCHECK_CURRENTLY_ON(BrowserThread::IO);
 
   // media::AudioParameters is validated in the deserializer.
   if (LookupById(stream_id) != NULL) {
     SendErrorMessage(stream_id);
     return;
   }
 
   // Create the shared memory and share with the renderer process.
   uint32_t shared_memory_size = sizeof(media::AudioOutputBufferParameters) +
@@ skipping 11 matching lines @@
     return;
   }
 
   MediaObserver* const media_observer =
       GetContentClient()->browser()->GetMediaObserver();
   if (media_observer)
     media_observer->OnCreatingAudioStream(render_process_id_, render_frame_id);
 
   std::unique_ptr<AudioEntry> entry(
       new AudioEntry(this, stream_id, render_frame_id, params, device_unique_id,
-                     std::move(shared_memory), std::move(reader)));
+                     std::move(shared_memory), std::move(reader), callback));
   if (mirroring_manager_) {
     mirroring_manager_->AddDiverter(
         render_process_id_, entry->render_frame_id(), entry->controller());
   }
   audio_entries_.insert(std::make_pair(stream_id, entry.release()));
   g_audio_streams_tracker.Get().IncreaseStreamCount();
 
   audio_log_->OnCreated(stream_id, params, device_unique_id);
   MediaInternals::GetInstance()->SetWebContentsTitleForAudioLogEntry(
       stream_id, render_process_id_, render_frame_id, audio_log_.get());
@@ skipping 92 matching lines @@
   // is closed.
   if (!LookupById(stream_id))
     return;
 
   SendErrorMessage(stream_id);
 
   audio_log_->OnError(stream_id);
   OnCloseStream(stream_id);
 }
 
+void AudioRendererHost::ReportErrorAndCloseStream(
+    int stream_id,
+    const mojom::AudioOutput::CreateStreamCallback& callback) {
+  DCHECK_CURRENTLY_ON(BrowserThread::IO);
+
+  // Make sure this isn't a stray callback executing after the stream has been
+  // closed, so error notifications aren't sent after clients believe the stream
+  // is closed.
+  if (!LookupById(stream_id))
+    return;
+  mojo::ScopedSharedBufferHandle shared_buffer_handle =
+      mojo::ScopedSharedBufferHandle(mojo::SharedBufferHandle());
+
+  mojo::ScopedHandle socket_handle = mojo::ScopedHandle(mojo::Handle());
+
+  callback.Run(stream_id, mojom::AudioOutputStreamPtr(),
+               std::move(shared_buffer_handle), std::move(socket_handle));
+
+  audio_log_->OnError(stream_id);
+  OnCloseStream(stream_id);
+}
+
 AudioRendererHost::AudioEntry* AudioRendererHost::LookupById(int stream_id) {
   DCHECK_CURRENTLY_ON(BrowserThread::IO);
 
   AudioEntryMap::const_iterator i = audio_entries_.find(stream_id);
   return i != audio_entries_.end() ? i->second : NULL;
 }
 
 void AudioRendererHost::UpdateNumPlayingStreams(AudioEntry* entry,
                                                 bool is_playing) {
   DCHECK_CURRENTLY_ON(BrowserThread::IO);
@@ skipping 109 matching lines @@
   callback.Run(false, device_info);
 }
 
 bool AudioRendererHost::IsAuthorizationStarted(int stream_id) {
   DCHECK_CURRENTLY_ON(BrowserThread::IO);
   const auto& i = authorizations_.find(stream_id);
   return i != authorizations_.end();
 }
 
 }  // namespace content