Implementation of 'AudioContext.getOutputTimestamp' method

content/renderer/media/renderer_webaudiodevice_impl.cc

Index: content/renderer/media/renderer_webaudiodevice_impl.cc
diff --git a/content/renderer/media/renderer_webaudiodevice_impl.cc b/content/renderer/media/renderer_webaudiodevice_impl.cc
index a9fba3b4e21ec8f451330dc4d22977766a1eed8c..643da0721e0591376b3bfa8efcdbf723833d970a 100644
--- a/content/renderer/media/renderer_webaudiodevice_impl.cc
+++ b/content/renderer/media/renderer_webaudiodevice_impl.cc
@@ -22,6 +22,7 @@
 #include "third_party/WebKit/public/web/WebView.h"
 
 using blink::WebAudioDevice;
+using blink::WebAudioTimestamp;
 using blink::WebLocalFrame;
 using blink::WebVector;
 using blink::WebView;
@@ -102,7 +103,8 @@ double RendererWebAudioDeviceImpl::sampleRate() {
 
 int RendererWebAudioDeviceImpl::Render(media::AudioBus* dest,
                                        uint32_t frames_delayed,
-                                       uint32_t frames_skipped) {
+                                       uint32_t frames_skipped,
+                                       const media::AudioTimestamp& timestamp) {
 #if defined(OS_ANDROID)
   if (is_first_buffer_after_silence_) {
     DCHECK(!is_using_null_audio_sink_);
@@ -120,9 +122,15 @@ int RendererWebAudioDeviceImpl::Render(media::AudioBus* dest,
   // TODO(xians): Remove the following |web_audio_source_data| after
   // changing the blink interface.
   WebVector<float*> web_audio_source_data(static_cast<size_t>(0));
+
+  double seconds = timestamp.ticks
+      / static_cast<double>(base::Time::kMicrosecondsPerSecond);
+  WebAudioTimestamp web_timestamp(static_cast<size_t>(timestamp.frames),

[hongchan, 2016/06/14 17:10:38]

Perhaps web_audio_timestamp is better?

[Mikhail, 2016/06/17 09:36:57]

Done.

+                                 seconds);
   client_callback_->render(web_audio_source_data,
                            web_audio_dest_data,
-                           dest->frames());
+                           dest->frames(),
+                           web_timestamp);
 
 #if defined(OS_ANDROID)
   const bool is_zero = dest->AreFramesZero();