Improve the reliablity of the audio e2e test.

- Use higher quality resampling.
- Add a longer delay before pacat recording.

TBR=kjellander@webrtc.org
BUG=issue502
TEST=manually

Review URL: https://webrtc-codereview.appspot.com/646005

git-svn-id: http://webrtc.googlecode.com/svn/trunk@2374 4adac7df-926f-26a2-2b94-8c16560cd09d

tools/e2e_quality/audio/README

@@ -7,6 +7,10 @@ arguments, run_audio_test.py expects a pair of sinks named "capture" and
 default.pa file in ~/.pulse. Alternately, the "pacmd" commands therein can be
 run on the command-line to create the devices.
 
+Similarly, place the provided daemon.conf file in ~/.pulse to use high quality
+resampling in PulseAudio. This will reduce the resampling impact on the outcome
+of the test.
+
 Build all WebRTC targets as usual (or just the audio_e2e_harness target) to
 generate the VoiceEngine harness.
 

tools/e2e_quality/audio/daemon.conf

@@ -0,0 +1 @@
+resample-method = speex-float-9

tools/e2e_quality/audio/run_audio_test.py

@@ -55,8 +55,9 @@ def main(argv):
   #
   # We pass the render device for VoiceEngine to select because (for unknown
   # reasons) the virtual device is sometimes not used when the default.
-  retcode = subprocess.call(['pacmd', 'set-default-source',
-      options.play_sink + '.monitor'], stdout=subprocess.PIPE);
+  command = ['pacmd', 'set-default-source', options.play_sink + '.monitor']
+  print ' '.join(command)
+  retcode = subprocess.call(command, stdout=subprocess.PIPE)
   if retcode != 0:
     return retcode
 
@@ -65,7 +66,7 @@ def main(argv):
   print ' '.join(command)
   voe_proc = subprocess.Popen(command)
 
-  format_args = ['-n', '--format=s16le', '--rate=' + options.rate,
+  format_args = ['--format=s16le', '--rate=' + options.rate,
       '--channels=' + options.channels, '--raw']
   command = (['pacat', '-p', '-d', options.play_sink] + format_args +
       [options.input])
@@ -75,7 +76,7 @@ def main(argv):
   # If recording starts before there is data available, pacat sometimes
   # inexplicably adds a large delay to the start of the file. We wait here in
   # an attempt to prevent that.
-  time.sleep(0.2)
+  time.sleep(2)
   command = (['pacat', '-r', '-d', options.rec_sink + '.monitor'] +
       format_args + [options.output])
   print ' '.join(command)