Reduce the runtime of some ACM tests in modules_tests

webrtc/modules/audio_coding/test/EncodeDecodeTest.cc

Index: webrtc/modules/audio_coding/test/EncodeDecodeTest.cc
diff --git a/webrtc/modules/audio_coding/test/EncodeDecodeTest.cc b/webrtc/modules/audio_coding/test/EncodeDecodeTest.cc
index ef45705e20aac0b1b984911d249b6415a3c28f7f..e2a3a1278c8355f87f0bbe93f3e256ea6ab6636f 100644
--- a/webrtc/modules/audio_coding/test/EncodeDecodeTest.cc
+++ b/webrtc/modules/audio_coding/test/EncodeDecodeTest.cc
@@ -15,6 +15,7 @@
 #include <stdlib.h>
 
 #include "testing/gtest/include/gtest/gtest.h"
+#include "webrtc/base/checks.h"
 #include "webrtc/base/scoped_ptr.h"
 #include "webrtc/common_types.h"
 #include "webrtc/modules/audio_coding/include/audio_coding_module.h"
@@ -63,6 +64,11 @@ void Sender::Setup(AudioCodingModule *acm, RTPStream *rtpStream,
   if (channels == 2) {
     _pcmFile.ReadStereo(true);
   }
+  static const int kTestLengthMs = 500;

[ivoc, 2015/12/10 12:23:57]

Not sure what the point of static is here.

[hlundin-webrtc, 2015/12/10 12:49:59]

Gone.

+  const int test_length_blocks = rtc::CheckedDivExact(kTestLengthMs, 10);
+  _pcmFile.SetNum10MsBlocksToRead(test_length_blocks);
+  // Fast-forward 1 second (100 blocks) since the file starts with silence.
+  _pcmFile.FastForward(100);
 
   // Set the codec for the current test.
   if ((testMode == 0) || (testMode == 1)) {