Binding media stream audio track to speech recognition [renderer]

content/renderer/speech_recognition_dispatcher.cc

Index: content/renderer/speech_recognition_dispatcher.cc
diff --git a/content/renderer/speech_recognition_dispatcher.cc b/content/renderer/speech_recognition_dispatcher.cc
index 178abf4610c286c751047ff46ec252089f2946bb..9dc1a4108c52fa2cf3635b4919d69a2fdac91d18 100644
--- a/content/renderer/speech_recognition_dispatcher.cc
+++ b/content/renderer/speech_recognition_dispatcher.cc
@@ -29,13 +29,15 @@ SpeechRecognitionDispatcher::SpeechRecognitionDispatcher(
     RenderViewImpl* render_view)
     : RenderViewObserver(render_view),
       recognizer_client_(NULL),
-      next_id_(1) {
-}
+      audio_track_set_(false),
+      is_allowed_audio_track_(false),
+      next_id_(1) {}
 
 SpeechRecognitionDispatcher::~SpeechRecognitionDispatcher() {
 }
 
 void SpeechRecognitionDispatcher::AbortAllRecognitions() {
+  audio_source_provider_.reset();
   Send(new SpeechRecognitionHostMsg_AbortAllRequests(
       routing_id()));
 }
@@ -53,11 +55,29 @@ bool SpeechRecognitionDispatcher::OnMessageReceived(
     IPC_MESSAGE_HANDLER(SpeechRecognitionMsg_Ended, OnRecognitionEnded)
     IPC_MESSAGE_HANDLER(SpeechRecognitionMsg_ResultRetrieved,
                         OnResultsRetrieved)
+    IPC_MESSAGE_HANDLER(SpeechRecognitionMsg_AudioTrackReady, OnAudioTrackReady)
     IPC_MESSAGE_UNHANDLED(handled = false)
   IPC_END_MESSAGE_MAP()
   return handled;
 }
 
+void SpeechRecognitionDispatcher::attach(
+    const blink::WebSpeechRecognitionHandle& handle,
+    const blink::WebMediaStreamTrack& audio_track,
+    blink::WebSpeechRecognizerClient* recognizer_client) {
+  // Check if track is from an allowed source (microphone only for now)
+  is_allowed_audio_track_ =
+      SpeechRecognitionAudioSourceProvider::IsAllowedAudioTrack(audio_track);
+  audio_track_ = audio_track;
+  audio_track_set_ = true;
+}
+
+void SpeechRecognitionDispatcher::detach(
+    const blink::WebSpeechRecognitionHandle& handle,
+    blink::WebSpeechRecognizerClient* recognizer_client) {
+  audio_track_set_ = false;
+}
+
 void SpeechRecognitionDispatcher::start(
     const WebSpeechRecognitionHandle& handle,
     const WebSpeechRecognitionParams& params,
@@ -65,6 +85,17 @@ void SpeechRecognitionDispatcher::start(
   DCHECK(!recognizer_client_ || recognizer_client_ == recognizer_client);
   recognizer_client_ = recognizer_client;
 
+  // Destroy any previous instance not to starve it waiting on chunk ACKs.
+  audio_source_provider_.reset();
+
+  if (audio_track_set_ && !is_allowed_audio_track_) {
+    // Notify user that the track used is not supported.
+    recognizer_client_->didReceiveError(
+        handle,
+        WebString("Provided audioTrack is not supported. Ignoring track."),
+        WebSpeechRecognizerClient::NotAllowedError);
+  }
+
   SpeechRecognitionHostMsg_StartRequest_Params msg_params;
   for (size_t i = 0; i < params.grammars().size(); ++i) {
     const WebSpeechGrammar& grammar = params.grammars()[i];
@@ -78,6 +109,8 @@ void SpeechRecognitionDispatcher::start(
   msg_params.origin_url = params.origin().toString().utf8();
   msg_params.render_view_id = routing_id();
   msg_params.request_id = GetOrCreateIDForHandle(handle);
+  // fall back to default input when the track is not allowed
+  msg_params.using_audio_track = (audio_track_set_ && is_allowed_audio_track_);
   // The handle mapping will be removed in |OnRecognitionEnd|.
   Send(new SpeechRecognitionHostMsg_StartRequest(msg_params));
 }
@@ -85,6 +118,7 @@ void SpeechRecognitionDispatcher::start(
 void SpeechRecognitionDispatcher::stop(
     const WebSpeechRecognitionHandle& handle,
     WebSpeechRecognizerClient* recognizer_client) {
+  audio_source_provider_.reset();
   // Ignore a |stop| issued without a matching |start|.
   if (recognizer_client_ != recognizer_client || !HandleExists(handle))
     return;
@@ -95,6 +129,7 @@ void SpeechRecognitionDispatcher::stop(
 void SpeechRecognitionDispatcher::abort(
     const WebSpeechRecognitionHandle& handle,
     WebSpeechRecognizerClient* recognizer_client) {
+  audio_source_provider_.reset();
   // Ignore an |abort| issued without a matching |start|.
   if (recognizer_client_ != recognizer_client || !HandleExists(handle))
     return;
@@ -154,6 +189,7 @@ void SpeechRecognitionDispatcher::OnErrorOccurred(
     recognizer_client_->didReceiveNoMatch(GetHandleFromID(request_id),
                                           WebSpeechRecognitionResult());
   } else {
+    audio_source_provider_.reset();
     recognizer_client_->didReceiveError(
         GetHandleFromID(request_id),
         WebString(),  // TODO(primiano): message?
@@ -174,6 +210,7 @@ void SpeechRecognitionDispatcher::OnRecognitionEnded(int request_id) {
     // didEnd may call back synchronously to start a new recognition session,
     // and we don't want to delete the handle from the map after that happens.
     handle_map_.erase(request_id);
+    audio_source_provider_.reset();
     recognizer_client_->didEnd(handle);
   }
 }
@@ -211,6 +248,26 @@ void SpeechRecognitionDispatcher::OnResultsRetrieved(
       GetHandleFromID(request_id), final, provisional);
 }
 
+// TODO(burnik): Each param on it's own line.
+void SpeechRecognitionDispatcher::OnAudioTrackReady(
+    int request_id, const media::AudioParameters& params,
+    base::SharedMemoryHandle memory,
+    base::SyncSocket::TransitDescriptor descriptor) {
+  DCHECK(!audio_source_provider_.get());
+  if (audio_track_.isNull()) {
+    audio_source_provider_.reset();
+    return;
+  }
+
+  scoped_ptr<base::SyncSocket> socket;
+  socket.reset(
+      new base::SyncSocket(base::SyncSocket::UnwrapHandle(descriptor)));
+
+  audio_source_provider_.reset(new SpeechRecognitionAudioSourceProvider(
+      audio_track_, params, memory, socket.release(),
+      base::Bind(&SpeechRecognitionDispatcher::OnAudioTrackError,
+                 base::Unretained(this))));
+}
 
 int SpeechRecognitionDispatcher::GetOrCreateIDForHandle(
     const WebSpeechRecognitionHandle& handle) {
@@ -239,6 +296,25 @@ bool SpeechRecognitionDispatcher::HandleExists(
   return false;
 }
 
+void SpeechRecognitionDispatcher::OnAudioTrackError(

[burnik, 2014/09/12 12:09:12]

Clearly not useful yet. Consider it a stub.

[burnik, 2014/09/15 15:00:07]

Refactored stub - just used for detecting a stop. Refactoring further in next
iteration.
On 2014/09/12 12:09:12, burnik wrote:

+    SpeechRecognitionAudioSourceProvider::ErrorState error) {
+  // TODO(burnik): handle error state events.
+  switch (error) {
+    case SpeechRecognitionAudioSourceProvider::ErrorState::SEND_FAILED:
+      DLOG(ERROR) << "SEND_FAILED";
+      break;
+    case SpeechRecognitionAudioSourceProvider::ErrorState::BUFFER_SYNC_LAG:
+      DLOG(ERROR) << "BUFFER_SYNC_LAG";
+      break;
+    case SpeechRecognitionAudioSourceProvider::ErrorState::AUDIO_FIFO_OVERFLOW:
+      DLOG(ERROR) << "AUDIO_FIFO_OVERFLOW";
+      break;
+    case SpeechRecognitionAudioSourceProvider::ErrorState::TRACK_STOPPED:
+      DLOG(ERROR) << "TRACK_STOPPED";
+      break;
+  }
+}
+
 const WebSpeechRecognitionHandle& SpeechRecognitionDispatcher::GetHandleFromID(
     int request_id) {
   HandleMap::iterator iter = handle_map_.find(request_id);