Adding pulseaudio input support to chrome

media/audio/pulse/pulse_output.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.
 //
 // Creates an audio output stream based on the PulseAudio asynchronous API;
 // specifically using the pa_threaded_mainloop model.
 //
 // If the stream is successfully opened, Close() must be called before the
 // stream is deleted as Close() is responsible for ensuring resource cleanup
 // occurs.
@@ skipping 13 matching lines @@
 #include "media/audio/audio_io.h"
 #include "media/audio/audio_parameters.h"
 
 struct pa_context;
 struct pa_operation;
 struct pa_stream;
 struct pa_threaded_mainloop;
 
 namespace media {
 class AudioManagerBase;
+class PulseWrapper;
 
 class PulseAudioOutputStream : public AudioOutputStream {
  public:
-  PulseAudioOutputStream(const AudioParameters& params,
+  PulseAudioOutputStream(PulseWrapper* wrapper,
+                         const AudioParameters& params,
                          AudioManagerBase* manager);
 
   virtual ~PulseAudioOutputStream();
 
   // Implementation of AudioOutputStream.
   virtual bool Open() OVERRIDE;
   virtual void Close() OVERRIDE;
   virtual void Start(AudioSourceCallback* callback) OVERRIDE;
   virtual void Stop() OVERRIDE;
   virtual void SetVolume(double volume) OVERRIDE;
   virtual void GetVolume(double* volume) OVERRIDE;
 
  private:
   // Called by PulseAudio when |pa_context_| and |pa_stream_| change state.  If
   // an unexpected failure state change happens and |source_callback_| is set
   // these methods will forward the error via OnError().
   static void ContextNotifyCallback(pa_context* c, void* p_this);
   static void StreamNotifyCallback(pa_stream* s, void* p_this);
 
   // Triggers pa_threaded_mainloop_signal() to avoid deadlocks.
-  static void StreamSuccessCallback(pa_stream* s, int success, void* p_this);
+  static void StreamSuccessCallback(pa_stream* s, int error, void* p_this);
 
   // Called by PulseAudio when it needs more audio data.
   static void StreamRequestCallback(pa_stream* s, size_t len, void* p_this);
 
   // Fulfill a write request from the write request callback.  Outputs silence
   // if the request could not be fulfilled.
   void FulfillWriteRequest(size_t requested_bytes);
 
   // Close() helper function to free internal structs.
   void Reset();
 
-  // Returns the current hardware latency value in bytes.
-  int GetHardwareLatencyInBytes();
-
-  // Helper method for waiting on Pulse Audio operations to complete.
-  void WaitForPulseOperation(pa_operation* op);
+  // Wrapper class to invoke all the Pulse functions.
+  PulseWrapper* wrapper_;
 
   // AudioParameters from the constructor.
   const AudioParameters params_;
 
   // Audio manager that created us.  Used to report that we've closed.
   AudioManagerBase* manager_;
 
   // PulseAudio API structs.
   pa_context* pa_context_;
   pa_threaded_mainloop* pa_mainloop_;
   pa_stream* pa_stream_;
 
   // Float representation of volume from 0.0 to 1.0.
   float volume_;
 
   // Callback to audio data source.  Must only be modified while holding a lock
   // on |pa_mainloop_| via pa_threaded_mainloop_lock().
   AudioSourceCallback* source_callback_;
 
   // Container for retrieving data from AudioSourceCallback::OnMoreData().
   scoped_ptr<AudioBus> audio_bus_;
 
   DISALLOW_COPY_AND_ASSIGN(PulseAudioOutputStream);
 };
 
 }  // namespace media
 
 #endif  // MEDIA_AUDIO_PULSE_PULSE_OUTPUT_H_