From bedc17be5c594d9821a08036564cb1db2d0e3723 Mon Sep 17 00:00:00 2001
From: "A.Brauckmann" <A.Brauckmann@gmail.com>
Date: Thu, 7 Jan 2016 12:38:31 -0800
Subject: [PATCH] Fixing integer underflow in FileAudioDevice (webrtc issue
 4554)

Problem is described here:
https://code.google.com/p/webrtc/issues/detail?id=4554

Review URL: https://codereview.webrtc.org/1295603002

Cr-Commit-Position: refs/heads/master@{#11174}
---
 AUTHORS                                            |  1 +
 .../audio_device/dummy/file_audio_device.cc        | 14 ++++++++++++--
 2 files changed, 13 insertions(+), 2 deletions(-)

diff --git a/AUTHORS b/AUTHORS
index c120acc12e..6f11ee66d8 100644
--- a/AUTHORS
+++ b/AUTHORS
@@ -32,6 +32,7 @@ Silviu Caragea <silviu.cpp@gmail.com>
 Steve Reid <sreid@sea-to-sky.net>
 Vicken Simonian <vsimon@gmail.com>
 Victor Costan <costan@gmail.com>
+Alexander Brauckmann <a.brauckmann@gmail.com>
 
 &yet LLC
 Agora IO
diff --git a/webrtc/modules/audio_device/dummy/file_audio_device.cc b/webrtc/modules/audio_device/dummy/file_audio_device.cc
index 3fff40b0f9..ea432af203 100644
--- a/webrtc/modules/audio_device/dummy/file_audio_device.cc
+++ b/webrtc/modules/audio_device/dummy/file_audio_device.cc
@@ -500,7 +500,12 @@ bool FileAudioDevice::PlayThreadProcess()
     }
     _playoutFramesLeft = 0;
     _critSect.Leave();
-    SleepMs(10 - (_clock->CurrentNtpInMilliseconds() - currentTime));
+
+    uint64_t deltaTimeMillis = _clock->CurrentNtpInMilliseconds() - currentTime;
+    if(deltaTimeMillis < 10) {
+      SleepMs(10 - deltaTimeMillis);
+    }
+
     return true;
 }
 
@@ -530,7 +535,12 @@ bool FileAudioDevice::RecThreadProcess()
     }
 
     _critSect.Leave();
-    SleepMs(10 - (_clock->CurrentNtpInMilliseconds() - currentTime));
+
+    uint64_t deltaTimeMillis = _clock->CurrentNtpInMilliseconds() - currentTime;
+    if(deltaTimeMillis < 10) {
+      SleepMs(10 - deltaTimeMillis);
+    }
+
     return true;
 }