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// Copyright (c) 2010 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 CHROME_BROWSER_CHROMEOS_AUDIO_MIXER_PULSE_H_
#define CHROME_BROWSER_CHROMEOS_AUDIO_MIXER_PULSE_H_
#pragma once
#include "base/basictypes.h"
#include "base/callback.h"
#include "base/scoped_ptr.h"
#include "base/synchronization/lock.h"
#include "base/threading/thread.h"
#include "chrome/browser/chromeos/audio_mixer.h"
struct pa_context;
struct pa_cvolume;
struct pa_threaded_mainloop;
struct pa_operation;
struct pa_sink_info;
namespace chromeos {
class AudioMixerPulse : public AudioMixer {
public:
AudioMixerPulse();
virtual ~AudioMixerPulse();
// Implementation of AudioMixer
virtual void Init(InitDoneCallback* callback);
virtual bool InitSync();
virtual double GetVolumeDb() const;
virtual bool GetVolumeLimits(double* vol_min, double* vol_max);
virtual void SetVolumeDb(double vol_db);
virtual bool IsMute() const;
virtual void SetMute(bool mute);
virtual State GetState() const;
private:
struct AudioInfo;
// The initialization task is run in the background on the worker thread.
void DoInit(InitDoneCallback* callback);
static void ConnectToPulseCallbackThunk(pa_context* c, void* userdata);
void OnConnectToPulseCallback(pa_context* c, bool* connect_done);
// Helper function to just get our messsage loop thread going.
bool InitThread();
// This goes through sequence of connecting to the default PulseAudio server.
// We will block until we either have a valid connection or something failed.
// If a connection is lost for some reason, delete and recreate the object.
bool PulseAudioInit();
// PulseAudioFree. Disconnect from server.
void PulseAudioFree();
// Iterates the PA mainloop and only returns once an operation has completed
// (successfully or unsuccessfully) or *done is true.
void CompleteOperation(pa_operation* pa_op, bool* done) const;
// For now, this just gets the first device returned from the enumeration
// request. This will be the 'default' or 'master' device that all further
// actions are taken on. Blocking call.
void GetDefaultPlaybackDevice();
static void EnumerateDevicesCallback(pa_context* unused,
const pa_sink_info* sink_info,
int eol,
void* userdata);
void OnEnumerateDevices(const pa_sink_info* sink_info, int eol, bool* done);
// Get the info we're interested in from the default device. Currently this
// is an array of volumes, and the mute state. Blocking call.
void GetAudioInfo(AudioInfo* info) const;
static void GetAudioInfoCallback(pa_context* unused,
const pa_sink_info* sink_info,
int eol,
void* userdata);
// These call down to PulseAudio's mainloop locking functions
void MainloopLock() const;
void MainloopUnlock() const;
void MainloopWait() const;
void MainloopSignal() const;
// Same as Lock(), but we fail if we are shutting down or mainloop invalid.
bool MainloopSafeLock() const;
// Lock the mainloop pa_lock_ if mixer_state_ is READY.
bool MainloopLockIfReady() const;
// The PulseAudio index of the main device being used.
int device_id_;
// Set to the number of channels on the main device.
int last_channels_;
// For informational purposes only, just used to assert lock is held.
mutable int mainloop_lock_count_;
mutable base::Lock mixer_state_lock_;
mutable State mixer_state_;
// Cached contexts for use in PulseAudio calls.
pa_context* pa_context_;
pa_threaded_mainloop* pa_mainloop_;
scoped_ptr<base::Thread> thread_;
DISALLOW_COPY_AND_ASSIGN(AudioMixerPulse);
};
} // namespace chromeos
DISABLE_RUNNABLE_METHOD_REFCOUNT(chromeos::AudioMixerPulse);
#endif // CHROME_BROWSER_CHROMEOS_AUDIO_MIXER_PULSE_H_
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