add audio-buffer-size command line flag support to the input audio for all the platforms

media/audio/audio_input_proxy.h

Index: media/audio/audio_input_proxy.h
diff --git a/media/audio/audio_input_proxy.h b/media/audio/audio_input_proxy.h
new file mode 100644
index 0000000000000000000000000000000000000000..0fcd128b20376535c05848939c44b679ca408663
--- /dev/null
+++ b/media/audio/audio_input_proxy.h
@@ -0,0 +1,103 @@
+// Copyright 2014 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_AUDIO_INPUT_PROXY_H_
+#define MEDIA_AUDIO_AUDIO_INPUT_PROXY_H_
+
+#include <string>
+
+#include "base/basictypes.h"
+#include "base/memory/scoped_ptr.h"
+#include "base/threading/thread_checker.h"
+#include "media/audio/audio_io.h"
+#include "media/audio/audio_parameters.h"
+
+namespace base {
+class TimeDelta;
+}
+
+namespace media {
+
+class AudioFifo;
+class AudioManagerBase;
+
+// AudioInputProxy is a proxy class between AudioInputStream and
+// AudioInputController. The purpose of this class is to allow AudioManagerBase
+// to restart the input streams when the required stream format has changed.
+class MEDIA_EXPORT AudioInputProxy :
+    public AudioInputStream,
+    public AudioInputStream::AudioInputCallback {
+ public:
+  AudioInputProxy(AudioManagerBase* manager,
+                  const AudioParameters& input_params,
+                  const AudioParameters& output_params,
+                  const std::string& device_id);
+  virtual ~AudioInputProxy();
+
+  void MaybeRestartStream(const AudioParameters& input_params);
+
+  bool is_idle() const { return stream_ != NULL; }
+
+  const AudioParameters& input_parameters() const { return input_params_; }
+
+  const std::string& device_id() const { return device_id_; }
+
+ private:
+  // Used to initialize and reinitialize |dispatcher_|.
+  void Initialize(const AudioParameters& input_params);
+
+  // AudioInputStream interface.
+  virtual bool Open() OVERRIDE;
+  virtual void Start(AudioInputStream::AudioInputCallback* callback) OVERRIDE;
+  virtual void Stop() OVERRIDE;
+  virtual void Close() OVERRIDE;
+  virtual double GetMaxVolume() OVERRIDE;
+  virtual void SetVolume(double volume) OVERRIDE;
+  virtual double GetVolume() OVERRIDE;
+  virtual void SetAutomaticGainControl(bool enabled) OVERRIDE;
+  virtual bool GetAutomaticGainControl() OVERRIDE;
+
+  // AudioInputCallback implementation.
+  virtual void OnData(AudioInputStream* stream,
+                      const media::AudioBus* src,
+                      uint32 hardware_delay_bytes,
+                      double volume) OVERRIDE;
+  virtual void OnError(AudioInputStream* stream) OVERRIDE;
+
+  AudioManagerBase* audio_manager_;
+
+  // Raw pointer to the audio input stream object, which will be deleted by
+  // AudioManagerBase after calling Close().
+  AudioInputStream* stream_;
+
+  // AudioParameters used to setup the input stream.
+  AudioParameters input_params_;
+
+  // AudioParameters used to output the audio data via |callback_|.
+  const AudioParameters output_params_;
+
+  // Device id for the input stream.
+  const std::string device_id_;
+
+  // Raw pointer to the callback which receives audio data.
+  AudioInputStream::AudioInputCallback* callback_;
+
+  // FIFO used as a intermedia buffering when the |input_format_| and
+  // |output_format_| are different.
+  scoped_ptr<media::AudioFifo> fifo_;
+
+  // Used to read data from |fifo_|.
+  scoped_ptr<media::AudioBus> audio_bus_;
+
+  bool opened_;
+  bool agc_enabled_;
+
+  base::ThreadChecker thread_checker_;
+
+  DISALLOW_COPY_AND_ASSIGN(AudioInputProxy);
+};
+
+}  // namespace media
+
+#endif  // MEDIA_AUDIO_AUDIO_INPUT_PROXY_H_