Fixing integer underflow in FileAudioDevice (webrtc issue 4554)

webrtc/modules/audio_device/dummy/file_audio_device.cc

Index: webrtc/modules/audio_device/dummy/file_audio_device.cc
diff --git a/webrtc/modules/audio_device/dummy/file_audio_device.cc b/webrtc/modules/audio_device/dummy/file_audio_device.cc
index 3de5344a8f151a81540e57ca2bc7b25b5305c131..e4547c423c964e0f31c7ab8c8eede369a81b1984 100644
--- a/webrtc/modules/audio_device/dummy/file_audio_device.cc
+++ b/webrtc/modules/audio_device/dummy/file_audio_device.cc
@@ -514,7 +514,12 @@ bool FileAudioDevice::PlayThreadProcess()
     }
     _playoutFramesLeft = 0;
     _critSect.Leave();
-    SleepMs(10 - (_clock->CurrentNtpInMilliseconds() - currentTime));
+
+    uint64_t deltaTimeMillis = _clock->CurrentNtpInMilliseconds() - currentTime;
+    if(deltaTimeMillis < 10) {

[phoglund, 2015/11/19 14:17:37]

Nit: space between if and (.

+      SleepMs(10 - deltaTimeMillis);
+    }
+
     return true;
 }
 
@@ -544,7 +549,12 @@ bool FileAudioDevice::RecThreadProcess()
     }
 
     _critSect.Leave();
-    SleepMs(10 - (_clock->CurrentNtpInMilliseconds() - currentTime));
+
+    uint64_t deltaTimeMillis = _clock->CurrentNtpInMilliseconds() - currentTime;
+    if(deltaTimeMillis < 10) {

[phoglund, 2015/11/19 14:17:37]

Nit: ditto

+      SleepMs(10 - deltaTimeMillis);
+    }
+
     return true;
 }