Microphone test using alsa instead of pulsaaudio command.

client/site_tests/audiovideo_Microphone/audiovideo_Microphone.py

Index: client/site_tests/audiovideo_Microphone/audiovideo_Microphone.py
diff --git a/client/site_tests/audiovideo_Microphone/audiovideo_Microphone.py b/client/site_tests/audiovideo_Microphone/audiovideo_Microphone.py
index b1dbbbc799737d0564acaf771bf8a94c0be731bb..fa8e5c37ff7ec8f0bd949e9a10d1d45fdb98169f 100644
--- a/client/site_tests/audiovideo_Microphone/audiovideo_Microphone.py
+++ b/client/site_tests/audiovideo_Microphone/audiovideo_Microphone.py
@@ -2,7 +2,7 @@
 # Use of this source code is governed by a BSD-style license that can be
 # found in the LICENSE file.
 
-import os, time
+import os, time, utils
 
 from autotest_lib.client.bin import test, utils
 from autotest_lib.client.common_lib import error
@@ -18,12 +18,8 @@ class audiovideo_Microphone(test.test):
         file_name = "/tmp/%s-%s.capture" % (ch, rate)
         cmd = "rm -f %s" % file_name
         utils.system(cmd, ignore_status=True)
-        cmd = "/usr/bin/pkill pacat"
-        utils.system(cmd, ignore_status=True)
-        cmd = "pacat -r --channels=%s --rate=%s %s &" % (ch, rate, file_name)
-        utils.system(cmd)
-        time.sleep(DURATION)
-        cmd = "/usr/bin/pkill pacat"
+        cmd = "arecord -f dat -D default -c %s -r %s -d %d %s"
+        cmd = cmd % (ch, rate, DURATION, file_name)
         utils.system(cmd)
         size = os.path.getsize(file_name)
         if (size < DURATION * rate * ch * BYTES_PER_SAMPLE * TOLERATE) :
@@ -32,17 +28,24 @@ class audiovideo_Microphone(test.test):
 
 
     def run_once(self):
+        cpuType = utils.get_cpu_arch()
         # Microphone should be on by default.
-        cmd = 'amixer -c 0 cget name="Capture Switch" | grep values=on,on'
-        output = utils.system_output(cmd)
-        if (output == ''):
-            raise error.TestFail('The microphone is not on by default.')
+        if cpuType != "arm":
+            cmd = 'amixer -c 0 cget name="Capture Switch" | grep values=on,on'
+            output = utils.system_output(cmd)
+            if (output == ''):
+                raise error.TestFail('The microphone is not on by default.')
+        else:
+            # TODO(jiesun): find consistent way to find the ALSA mixer control
+            # names for both internal mic and external mic on ARM, which is
+            # independent of the audio codec hardware vendor.
+            print "Warning: Can not verify the microphone capture switch."
 
         # Mono and stereo capturing should work fine @ 44.1KHz and 48KHz.
         self.verify_capture(1, 44100)
         self.verify_capture(1, 48000)
-        self.verify_capture(2, 44100)
         self.verify_capture(2, 48000)
+        self.verify_capture(2, 44100)
 
         # TODO(zhurunz):
         # Low latency capturing should work fine with low CPU usage.