Reduce the runtime of some ACM tests in modules_tests

webrtc/modules/audio_coding/test/EncodeDecodeTest.cc

 /*
  *  Copyright (c) 2012 The WebRTC project authors. All Rights Reserved.
  *
  *  Use of this source code is governed by a BSD-style license
  *  that can be found in the LICENSE file in the root of the source
  *  tree. An additional intellectual property rights grant can be found
  *  in the file PATENTS.  All contributing project authors may
  *  be found in the AUTHORS file in the root of the source tree.
  */
 
@@ skipping 45 matching lines @@
   struct CodecInst sendCodec;
   int noOfCodecs = acm->NumberOfCodecs();
   int codecNo;
 
   // Open input file
   const std::string file_name = webrtc::test::ResourcePath(in_file_name, "pcm");
   _pcmFile.Open(file_name, sample_rate, "rb");
   if (channels == 2) {
     _pcmFile.ReadStereo(true);
   }
+  // Set test length to 500 ms (50 blocks of 10 ms each).
+  _pcmFile.SetNum10MsBlocksToRead(50);
+  // 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)) {
     // Set the codec id.
     codecNo = codeId;
   } else {
     // Choose codec on command line.
     printf("List of supported codec.\n");
     for (int n = 0; n < noOfCodecs; n++) {
       EXPECT_EQ(0, acm->Codec(n, &sendCodec));
@@ skipping 266 matching lines @@
   if (acm->SendCodec()) {
     _sender.Run();
   }
   _sender.Teardown();
   rtpFile.Close();
 
   return fileName;
 }
 
 }  // namespace webrtc