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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.
#include "media/audio/audio_manager.h"
#include "base/at_exit.h"
#include "base/compiler_specific.h"
#include "base/logging.h"
namespace {
bool g_destroy_called = false;
AudioManager* g_audio_manager = NULL;
// NullAudioManager is the audio manager used on the systems that have no
// audio support.
class NullAudioManager : public AudioManager {
public:
NullAudioManager() { }
// Implementation of AudioManager.
virtual bool HasAudioOutputDevices() OVERRIDE { return false; }
virtual bool HasAudioInputDevices() OVERRIDE { return false; }
virtual AudioOutputStream* MakeAudioOutputStream(
AudioParameters params) OVERRIDE {
NOTIMPLEMENTED();
return NULL;
}
virtual AudioInputStream* MakeAudioInputStream(
AudioParameters params) OVERRIDE {
NOTIMPLEMENTED();
return NULL;
}
virtual void MuteAll() OVERRIDE { NOTIMPLEMENTED(); }
virtual void UnMuteAll() OVERRIDE { NOTIMPLEMENTED(); }
private:
DISALLOW_COPY_AND_ASSIGN(NullAudioManager);
};
} // namespace
// static
void AudioManager::Destroy(void* not_used) {
g_destroy_called = true;
g_audio_manager->Cleanup();
AudioManager* audio_manager = g_audio_manager;
g_audio_manager = NULL;
delete audio_manager;
}
// static
AudioManager* AudioManager::GetAudioManager() {
if (!g_audio_manager && !g_destroy_called) {
g_audio_manager = CreateAudioManager();
g_audio_manager->Init();
base::AtExitManager::RegisterCallback(&AudioManager::Destroy, NULL);
}
return g_audio_manager;
}
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