Clear the FIFO when calling input stream::Stop()

media/audio/pulse/pulse_input.cc

 // Copyright (c) 2012 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #include "media/audio/pulse/pulse_input.h"
 
 #include <pulse/pulseaudio.h>
 
 #include "base/logging.h"
 #include "media/audio/pulse/audio_manager_pulse.h"
@@ skipping 56 matching lines @@
   DCHECK(handle_);
 
   // AGC needs to be started out of the lock.
   StartAgc();
 
   AutoPulseLock auto_lock(pa_mainloop_);
 
   if (stream_started_)
     return;
 
-  // Clean up the old buffer.
-  pa_stream_drop(handle_);
-  fifo_.Clear();
-
   // Start the streaming.
   callback_ = callback;
   pa_stream_set_read_callback(handle_, &ReadCallback, this);
   pa_stream_readable_size(handle_);
   stream_started_ = true;
 
   pa_operation* operation = pa_stream_cork(handle_, 0, NULL, NULL);
   WaitForOperationCompletion(pa_mainloop_, operation);
 }
 
 void PulseAudioInputStream::Stop() {
   DCHECK(thread_checker_.CalledOnValidThread());
   AutoPulseLock auto_lock(pa_mainloop_);
   if (!stream_started_)
     return;
 
   StopAgc();
 
   // Set the flag to false to stop filling new data to soundcard.
   stream_started_ = false;
 
+  // Clean up the old buffer.
+  pa_stream_drop(handle_);
+  fifo_.Clear();
+
   pa_operation* operation = pa_stream_flush(handle_,
                                             &pulse::StreamSuccessCallback,
                                             pa_mainloop_);
   WaitForOperationCompletion(pa_mainloop_, operation);
 
   // Stop the stream.
   pa_stream_set_read_callback(handle_, NULL, NULL);
   operation = pa_stream_cork(handle_, 1, &pulse::StreamSuccessCallback,
                              pa_mainloop_);
   WaitForOperationCompletion(pa_mainloop_, operation);
@@ skipping 183 matching lines @@
     // Sleep 5ms to wait until render consumes the data in order to avoid
     // back to back OnData() method.
     if (fifo_.available_blocks())
       base::PlatformThread::Sleep(base::TimeDelta::FromMilliseconds(5));
   }
 
   pa_threaded_mainloop_signal(pa_mainloop_, 0);
 }
 
 }  // namespace media