Fake no input callbacks in PulseAudio.

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 <stdint.h>
 
 #include "base/logging.h"
 #include "media/audio/audio_device_description.h"
@@ skipping 94 matching lines @@
                                             &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);
   callback_ = NULL;
+
+  callback_count_ = 0;
 }
 
 void PulseAudioInputStream::Close() {
   DCHECK(thread_checker_.CalledOnValidThread());
   {
     AutoPulseLock auto_lock(pa_mainloop_);
     if (handle_) {
       // Disable all the callbacks before disconnecting.
       pa_stream_set_state_callback(handle_, NULL, NULL);
       pa_operation* operation = pa_stream_flush(
@@ skipping 138 matching lines @@
 
   if (s && stream->callback_ &&
       pa_stream_get_state(s) == PA_STREAM_FAILED) {
     stream->callback_->OnError(stream);
   }
 
   pa_threaded_mainloop_signal(stream->pa_mainloop_, 0);
 }
 
 void PulseAudioInputStream::ReadData() {
+  if (callback_count_++ > 1000)
+    return;
+
   uint32_t hardware_delay = pulse::GetHardwareLatencyInBytes(
       handle_, params_.sample_rate(), params_.GetBytesPerFrame());
 
   // Update the AGC volume level once every second. Note that,
   // |volume| is also updated each time SetVolume() is called
   // through IPC by the render-side AGC.
   // We disregard the |normalized_volume| from GetAgcVolume()
   // and use the value calculated by |volume_|.
   double normalized_volume = 0.0;
   GetAgcVolume(&normalized_volume);
@@ skipping 44 matching lines @@
     return false;
 
   size_t index = pa_stream_get_device_index(handle_);
   pa_operation* operation =
       pa_context_get_source_info_by_index(pa_context_, index, callback, this);
   WaitForOperationCompletion(pa_mainloop_, operation);
   return true;
 }
 
 }  // namespace media