media/audio/pulse/pulse_input.h

   1 // Copyright (c) 2012 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_PULSE_INPUT_H_
   6 #define MEDIA_AUDIO_PULSE_PULSE_INPUT_H_
   7
   8 #include <string>
   9
  10 #include "base/threading/thread_checker.h"
  11 #include "media/audio/agc_audio_stream.h"
  12 #include "media/audio/audio_device_name.h"
  13 #include "media/audio/audio_io.h"
  14 #include "media/audio/audio_parameters.h"
  15
  16 struct pa_context;
  17 struct pa_source_info;
  18 struct pa_stream;
  19 struct pa_threaded_mainloop;
  20
  21 namespace media {
  22
  23 class AudioManagerPulse;
  24 class SeekableBuffer;
  25
  26 class PulseAudioInputStream : public AgcAudioStream<AudioInputStream> {
  27  public:
  28   PulseAudioInputStream(AudioManagerPulse* audio_manager,
  29                         const std::string& device_name,
  30                         const AudioParameters& params,
  31                         pa_threaded_mainloop* mainloop,
  32                         pa_context* context);
  33
  34   virtual ~PulseAudioInputStream();
  35
  36   // Implementation of AudioInputStream.
  37   virtual bool Open() OVERRIDE;
  38   virtual void Start(AudioInputCallback* callback) OVERRIDE;
  39   virtual void Stop() OVERRIDE;
  40   virtual void Close() OVERRIDE;
  41   virtual double GetMaxVolume() OVERRIDE;
  42   virtual void SetVolume(double volume) OVERRIDE;
  43   virtual double GetVolume() OVERRIDE;
  44
  45  private:
  46   // PulseAudio Callbacks.
  47   static void ReadCallback(pa_stream* handle, size_t length, void* user_data);
  48   static void StreamNotifyCallback(pa_stream* stream, void* user_data);
  49   static void VolumeCallback(pa_context* context, const pa_source_info* info,
  50                              int error, void* user_data);
  51
  52   // Helper for the ReadCallback.
  53   void ReadData();
  54
  55   AudioManagerPulse* audio_manager_;
  56   AudioInputCallback* callback_;
  57   std::string device_name_;
  58   AudioParameters params_;
  59   int channels_;
  60   double volume_;
  61   bool stream_started_;
  62
  63   // Holds the data from the OS.
  64   scoped_ptr<media::SeekableBuffer> buffer_;
  65
  66   // Temporary storage for recorded data. It gets a packet of data from
  67   // |buffer_| and deliver the data to OnData() callback.
  68   scoped_ptr<uint8[]> audio_data_buffer_;
  69
  70   // PulseAudio API structs.
  71   pa_threaded_mainloop* pa_mainloop_; // Weak.
  72   pa_context* pa_context_;  // Weak.
  73   pa_stream* handle_;
  74
  75   // Flag indicating the state of the context has been changed.
  76   bool context_state_changed_;
  77
  78   base::ThreadChecker thread_checker_;
  79
  80   DISALLOW_COPY_AND_ASSIGN(PulseAudioInputStream);
  81 };
  82
  83 }  // namespace media
  84
  85 #endif  // MEDIA_AUDIO_PULSE_PULSE_INPUT_H_