src/media/audio/pulse/audio_manager_pulse.h

   1 // Copyright 2013 The Chromium Authors. All rights reserved.
   2 // Use of this source code is governed by a BSD-style license that can be
   3 // found in the LICENSE file.
   4
   5 #ifndef MEDIA_AUDIO_PULSE_AUDIO_MANAGER_PULSE_H_
   6 #define MEDIA_AUDIO_PULSE_AUDIO_MANAGER_PULSE_H_
   7
   8 #include <pulse/pulseaudio.h>
   9 #include <string>
  10
  11 #include "base/compiler_specific.h"
  12 #include "base/memory/ref_counted.h"
  13 #include "media/audio/audio_manager_base.h"
  14
  15 namespace media {
  16
  17 class MEDIA_EXPORT AudioManagerPulse : public AudioManagerBase {
  18  public:
  19   AudioManagerPulse(AudioLogFactory* audio_log_factory);
  20   virtual ~AudioManagerPulse();
  21
  22   static AudioManager* Create(AudioLogFactory* audio_log_factory);
  23
  24   // Implementation of AudioManager.
  25   virtual bool HasAudioOutputDevices() OVERRIDE;
  26   virtual bool HasAudioInputDevices() OVERRIDE;
  27   virtual void ShowAudioInputSettings() OVERRIDE;
  28   virtual void GetAudioInputDeviceNames(
  29       AudioDeviceNames* device_names) OVERRIDE;
  30   virtual void GetAudioOutputDeviceNames(
  31       AudioDeviceNames* device_names) OVERRIDE;
  32   virtual AudioParameters GetInputStreamParameters(
  33       const std::string& device_id) OVERRIDE;
  34
  35   // Implementation of AudioManagerBase.
  36   virtual AudioOutputStream* MakeLinearOutputStream(
  37       const AudioParameters& params) OVERRIDE;
  38   virtual AudioOutputStream* MakeLowLatencyOutputStream(
  39       const AudioParameters& params,
  40       const std::string& device_id) OVERRIDE;
  41   virtual AudioInputStream* MakeLinearInputStream(
  42       const AudioParameters& params, const std::string& device_id) OVERRIDE;
  43   virtual AudioInputStream* MakeLowLatencyInputStream(
  44       const AudioParameters& params, const std::string& device_id) OVERRIDE;
  45
  46  protected:
  47   virtual AudioParameters GetPreferredOutputStreamParameters(
  48       const std::string& output_device_id,
  49       const AudioParameters& input_params) OVERRIDE;
  50
  51  private:
  52   bool Init();
  53   void DestroyPulse();
  54
  55   void GetAudioDeviceNames(bool input, media::AudioDeviceNames* device_names);
  56
  57   // Callback to get the devices' info like names, used by GetInputDevices().
  58   static void InputDevicesInfoCallback(pa_context* context,
  59                                        const pa_source_info* info,
  60                                        int error, void* user_data);
  61   static void OutputDevicesInfoCallback(pa_context* context,
  62                                         const pa_sink_info* info,
  63                                         int error, void* user_data);
  64
  65   // Callback to get the native sample rate of PulseAudio, used by
  66   // GetNativeSampleRate().
  67   static void SampleRateInfoCallback(pa_context* context,
  68                                      const pa_server_info* info,
  69                                      void* user_data);
  70
  71   // Called by MakeLinearOutputStream and MakeLowLatencyOutputStream.
  72   AudioOutputStream* MakeOutputStream(const AudioParameters& params,
  73                                       const std::string& device_id);
  74
  75   // Called by MakeLinearInputStream and MakeLowLatencyInputStream.
  76   AudioInputStream* MakeInputStream(const AudioParameters& params,
  77                                     const std::string& device_id);
  78
  79   // Gets the native sample rate of Pulse.
  80   int GetNativeSampleRate();
  81
  82   pa_threaded_mainloop* input_mainloop_;
  83   pa_context* input_context_;
  84   AudioDeviceNames* devices_;
  85   int native_input_sample_rate_;
  86
  87   DISALLOW_COPY_AND_ASSIGN(AudioManagerPulse);
  88 };
  89
  90 }  // namespace media
  91
  92 #endif  // MEDIA_AUDIO_PULSE_AUDIO_MANAGER_PULSE_H_