Support for AudioContextOptions latencyHint.

third_party/WebKit/Source/modules/webaudio/DefaultAudioDestinationNode.cpp

Index: third_party/WebKit/Source/modules/webaudio/DefaultAudioDestinationNode.cpp
diff --git a/third_party/WebKit/Source/modules/webaudio/DefaultAudioDestinationNode.cpp b/third_party/WebKit/Source/modules/webaudio/DefaultAudioDestinationNode.cpp
index f6f9c48cc2f7924c6f9148ed9c5f8a6dd623b376..f4e7e655151056dc2306269ced4656e733f95cd0 100644
--- a/third_party/WebKit/Source/modules/webaudio/DefaultAudioDestinationNode.cpp
+++ b/third_party/WebKit/Source/modules/webaudio/DefaultAudioDestinationNode.cpp
@@ -31,9 +31,12 @@
 
 namespace blink {
 
-DefaultAudioDestinationHandler::DefaultAudioDestinationHandler(AudioNode& node)
+DefaultAudioDestinationHandler::DefaultAudioDestinationHandler(
+    AudioNode& node,
+    const WebAudioLatencyHint& latencyHint)
     : AudioDestinationHandler(node, AudioDestination::hardwareSampleRate()),
-      m_numberOfInputChannels(0) {
+      m_numberOfInputChannels(0),
+      m_latencyHint(latencyHint) {
   // Node-specific default mixing rules.
   m_channelCount = 2;
   setInternalChannelCountMode(Explicit);
@@ -41,8 +44,9 @@ DefaultAudioDestinationHandler::DefaultAudioDestinationHandler(AudioNode& node)
 }
 
 PassRefPtr<DefaultAudioDestinationHandler>
-DefaultAudioDestinationHandler::create(AudioNode& node) {
-  return adoptRef(new DefaultAudioDestinationHandler(node));
+DefaultAudioDestinationHandler::create(AudioNode& node,
+                                       const WebAudioLatencyHint& latencyHint) {
+  return adoptRef(new DefaultAudioDestinationHandler(node, latencyHint));
 }
 
 DefaultAudioDestinationHandler::~DefaultAudioDestinationHandler() {
@@ -75,12 +79,9 @@ void DefaultAudioDestinationHandler::uninitialize() {
 }
 
 void DefaultAudioDestinationHandler::createDestination() {
-  float hardwareSampleRate = AudioDestination::hardwareSampleRate();
-  VLOG(1) << ">>>> hardwareSampleRate = " << hardwareSampleRate;

[Raymond Toy, 2016/11/15 18:16:17]

I hope we didn't lose this log print.  It's really useful on Android to get the
sample rate displayed.

[Andrew MacPherson, 2016/11/16 10:58:29]

Should I re-add the log print though we won't pass the hardwareSampleRate into
the AudioDestination or should the log print be moved to the 'content' side
where the hardware sample rate will be determined?

-
   m_destination = AudioDestination::create(
       *this, m_inputDeviceId, m_numberOfInputChannels, channelCount(),
-      hardwareSampleRate, context()->getSecurityOrigin());
+      m_latencyHint, context()->getSecurityOrigin());
 }
 
 void DefaultAudioDestinationHandler::startRendering() {
@@ -136,14 +137,16 @@ void DefaultAudioDestinationHandler::setChannelCount(
 // ----------------------------------------------------------------
 
 DefaultAudioDestinationNode::DefaultAudioDestinationNode(
-    BaseAudioContext& context)
+    BaseAudioContext& context,
+    const WebAudioLatencyHint& latencyHint)
     : AudioDestinationNode(context) {
-  setHandler(DefaultAudioDestinationHandler::create(*this));
+  setHandler(DefaultAudioDestinationHandler::create(*this, latencyHint));
 }
 
 DefaultAudioDestinationNode* DefaultAudioDestinationNode::create(
-    BaseAudioContext* context) {
-  return new DefaultAudioDestinationNode(*context);
+    BaseAudioContext* context,
+    const WebAudioLatencyHint& latencyHint) {
+  return new DefaultAudioDestinationNode(*context, latencyHint);
 }
 
 }  // namespace blink