Let default device in PulseAudio be the system default device

media/audio/pulse/pulse_input.h

 // 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.
 
 #ifndef MEDIA_AUDIO_PULSE_PULSE_INPUT_H_
 #define MEDIA_AUDIO_PULSE_PULSE_INPUT_H_
 
 #include <pulse/pulseaudio.h>
 #include <stddef.h>
 #include <string>
 
 #include "base/macros.h"
 #include "base/threading/thread_checker.h"
 #include "media/audio/agc_audio_stream.h"
 #include "media/audio/audio_device_name.h"
 #include "media/audio/audio_io.h"
 #include "media/audio/audio_parameters.h"
+#include "media/audio/pulse/pulse_util.h"

[Henrik Grunell, 2016/03/07 11:37:17]

Is this needed?

[rchtara, 2016/03/08 17:28:16]

Done.

 #include "media/base/audio_block_fifo.h"
 
 namespace media {
 
 class AudioManagerPulse;
 
 class PulseAudioInputStream : public AgcAudioStream<AudioInputStream> {
  public:
   PulseAudioInputStream(AudioManagerPulse* audio_manager,
                         const std::string& device_name,
@@ skipping 17 matching lines @@
   // PulseAudio Callbacks.
   static void ReadCallback(pa_stream* handle, size_t length, void* user_data);
   static void StreamNotifyCallback(pa_stream* stream, void* user_data);
   static void VolumeCallback(pa_context* context, const pa_source_info* info,
                              int error, void* user_data);
   static void MuteCallback(pa_context* context,
                            const pa_source_info* info,
                            int error,
                            void* user_data);
 
+  // pa_context_get_server_info callback. It's used by
+  // UseSystemDefaultInputDevice to set |device_name_| to the
+  // default system input device.
+  static void UseSystemDefaultInputDeviceCallback(pa_context* context,
+                                                  const pa_server_info* info,
+                                                  void* user_data);
+
+  // Use default system input device for the input stream.
+  void UseSystemDefaultInputDevice();
+
   // Helper for the ReadCallback.
   void ReadData();
 
   // Utility method used by GetVolume() and IsMuted().
   bool GetSourceInformation(pa_source_info_cb_t callback);
 
   AudioManagerPulse* audio_manager_;
   AudioInputCallback* callback_;
   std::string device_name_;

[Henrik Grunell, 2016/03/07 11:37:17]

Change this to const.

[rchtara, 2016/03/08 17:28:16]

Done.

   AudioParameters params_;
   int channels_;
   double volume_;
   bool stream_started_;
 
   // Set to true in IsMuted() if user has muted the selected microphone in the
   // sound settings UI.
   bool muted_;
 
   // Holds the data from the OS.
   AudioBlockFifo fifo_;
 
   // PulseAudio API structs.
   pa_threaded_mainloop* pa_mainloop_; // Weak.
   pa_context* pa_context_;  // Weak.
   pa_stream* handle_;
 
   base::ThreadChecker thread_checker_;
 
   DISALLOW_COPY_AND_ASSIGN(PulseAudioInputStream);
 };
 
 }  // namespace media
 
 #endif  // MEDIA_AUDIO_PULSE_PULSE_INPUT_H_