1 files changed, 17 insertions, 0 deletions
diff --git a/media/audio/audio_output_controller.cc b/media/audio/audio_output_controller.cc
index adad10a..b83aa61 100644
--- a/media/audio/audio_output_controller.cc
+++ b/media/audio/audio_output_controller.cc
@@ -7,6 +7,10 @@
 #include "base/bind.h"
 #include "base/debug/trace_event.h"
 #include "base/message_loop.h"
+#include "base/threading/platform_thread.h"
+#include "base/time.h"
+
+using base::Time;
 
 namespace media {
 
@@ -359,6 +363,19 @@ uint32 AudioOutputController::OnMoreData(
   return size;
 }
 
+void AudioOutputController::WaitTillDataReady() {
+  if (LowLatencyMode() && !sync_reader_->DataReady()) {
+    // In the different place we use different mechanism to poll, get max
+    // polling delay from constants used there.
+    const int kMaxPollingDelayMs = kPollNumAttempts * kPollPauseInMilliseconds;
+    Time start_time = Time::Now();
+    do {
+      base::PlatformThread::Sleep(1);
+    } while (!sync_reader_->DataReady() &&
+             (Time::Now() - start_time).InMilliseconds() < kMaxPollingDelayMs);
+  }
+}
+
 void AudioOutputController::OnError(AudioOutputStream* stream, int code) {
   // Handle error on the audio controller thread.
   message_loop_->PostTask(FROM_HERE, base::Bind(