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/*
**
** Copyright 2012, The Android Open Source Project
**
** Licensed under the Apache License, Version 2.0 (the "License");
** you may not use this file except in compliance with the License.
** You may obtain a copy of the License at
**
** http://www.apache.org/licenses/LICENSE-2.0
**
** Unless required by applicable law or agreed to in writing, software
** distributed under the License is distributed on an "AS IS" BASIS,
** WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
** See the License for the specific language governing permissions and
** limitations under the License.
*/
#ifndef ANDROID_AUDIO_HOTPLUG_THREAD_H
#define ANDROID_AUDIO_HOTPLUG_THREAD_H
#include <utils/threads.h>
namespace android {
class AudioHotplugThread : public Thread {
public:
struct DeviceInfo {
unsigned int pcmCard;
unsigned int pcmDevice;
unsigned int minSampleBits, maxSampleBits;
unsigned int minChannelCount, maxChannelCount;
unsigned int minSampleRate, maxSampleRate;
bool valid;
bool forVoiceRecognition;
};
class Callback {
public:
virtual ~Callback() {}
virtual void onDeviceFound(const DeviceInfo& devInfo) = 0;
virtual void onDeviceRemoved(unsigned int pcmCard, unsigned int pcmDevice) = 0;
};
AudioHotplugThread(Callback& callback);
virtual ~AudioHotplugThread();
bool start();
void shutdown();
private:
static const char* kThreadName;
static const char* kAlsaDeviceDir;
static const char kDeviceTypeCapture;
static bool parseCaptureDeviceName(const char *name, unsigned int *pcmCard,
unsigned int *pcmDevice);
static bool getDeviceInfo(unsigned int pcmCard, unsigned int pcmDevice,
DeviceInfo* info);
virtual bool threadLoop();
void scanForDevice();
Callback& mCallback;
int mShutdownEventFD;
};
}; // namespace android
#endif // ANDROID_AUDIO_HOTPLUG_THREAD_H
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