TinyAlsa 之举从驱动拿到指定设备的音频输入，同时 AudioTrack 和 AudioRecode 使用默认输入输出

package com.lihan.soundcard; import android.app.PendingIntent; import android.content.BroadcastReceiver; import android.content.Context; import android.content.Intent; import android.content.IntentFilter; import android.hardware.usb.UsbConstants; import android.hardware.usb.UsbDevice; import android.hardware.usb.UsbDeviceConnection; import android.hardware.usb.UsbEndpoint; import android.hardware.usb.UsbInterface; import android.hardware.usb.UsbManager; import android.media.AudioManager; import android.os.Build; import android.support.annotation.RequiresApi; import android.support.v7.app.AppCompatActivity; import android.os.Bundle; import android.util.Log; import android.widget.EditText; import java.util.HashMap; import java.util.Iterator; import java.util.Timer; import java.util.TimerTask; public class MainActivity extends AppCompatActivity implements AlsaPcmData{ private UsbManager mUsbManager; public static final String ACTION_DEVICE_PERMISSION = "com.linc.USB_PERMISSION"; private PendingIntent mPermissionIntent; private StringBuffer tvInfo; private boolean thisConnect; private EditText text; @RequiresApi(api = Build.VERSION_CODES.LOLLIPOP) @Override protected void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); setContentView(R.layout.activity_main); this.text = findViewById(R.id.textview); tvInfo = new StringBuffer(); thisConnect = true; initAudio(); mUsbManager = (UsbManager)getSystemService(Context.USB_SERVICE); // 用于USB授权的Intent mPermissionIntent = PendingIntent.getBroadcast(this,0,new Intent(ACTION_DEVICE_PERMISSION),0); // 枚举USB设备 HashMap<String,UsbDevice> deviceHashMap = mUsbManager.getDeviceList(); Iterator<UsbDevice> iterator = deviceHashMap.values().iterator(); while (iterator.hasNext()) { UsbDevice device = iterator.next(); // 判断APP对该USB设备是否有权限，若没有权限则申请USB设备权限 if(mUsbManager.hasPermission(device)) { //do your work initCommunication(device); } else { mUsbManager.requestPermission(device,mPermissionIntent); } Log.e("TAG", "\ndevice name: "+device.getDeviceName()+"\ndevice product name:" +device.getProductName()+"\nvendor id:"+device.getVendorId()+ "\ndevice serial: "+device.getSerialNumber()+ "\ndevice serial: "+device.getProductId()); } } @Override protected void onResume() { super.onResume(); // 注册USB设备插拔、授权等广播，以监听到之后处理相应的操作。 IntentFilter usbFilter = new IntentFilter(); usbFilter.addAction(UsbManager.ACTION_USB_DEVICE_ATTACHED); usbFilter.addAction(UsbManager.ACTION_USB_DEVICE_DETACHED); usbFilter.addAction(ACTION_DEVICE_PERMISSION); registerReceiver(mUsbReceiver, usbFilter); // new ExeCommand().run("chmod 777 /dev/snd/pcmC0D0c",-1); new Thread(){ @Override public void run() { super.run(); // AudioRecordDemo demo = new AudioRecordDemo(); // demo.getNoiseLevel(); try { sleep(5000); } catch (InterruptedException e) { e.printStackTrace(); } AlsaUtil util = new AlsaUtil(MainActivity.this); util.init(); util.start(); } }.start(); } @Override protected void onPause() { super.onPause(); unregisterReceiver(mUsbReceiver); } @Override protected void onDestroy() { super.onDestroy(); thisConnect = false; } /*==============以下获取特定的USB设备信息=============*/ private UsbEndpoint mUsbEndpointIn; private UsbEndpoint mUsbEndpointOut; private UsbInterface mUsbInterfaceInt; private UsbInterface musbInterfaceOut; UsbDeviceConnection mUsbDeviceConnection; /** * * 遍历USB设备各个节点，获取节点信息，并且打开USB连接 */ private void initCommunication(UsbDevice device) { tvInfo.append("initCommunication in\n"); tvInfo.append("initCommunication in right device\n"); int interfaceCount = device.getInterfaceCount(); tvInfo.append("interfaceCount " + interfaceCount + "\n"); for (int interfaceIndex = 0; interfaceIndex < interfaceCount; interfaceIndex++) { UsbInterface usbInterface = device.getInterface(interfaceIndex); tvInfo.append("=========>>"+ usbInterface.getInterfaceClass() + usbInterface.getInterfaceSubclass() + "<<===================\n"); if ((UsbConstants.USB_CLASS_AUDIO != usbInterface.getInterfaceClass()) && (UsbConstants.USB_CLASS_HID != usbInterface.getInterfaceClass())) { tvInfo.append("usbInterface.getInterfaceClass() " + usbInterface.getInterfaceClass() + usbInterface.getInterfaceSubclass() + "\n"); continue; } tvInfo.append("========="+ usbInterface.getEndpointCount() + "===================\n"); for (int i = 0; i < usbInterface.getEndpointCount(); i++) { UsbEndpoint ep = usbInterface.getEndpoint(i); tvInfo.append("usbInterface.getEndpoint(i) " + ep.getType() + "\n"); if (ep.getType() == UsbConstants.USB_ENDPOINT_XFER_ISOC) { if (ep.getDirection() == UsbConstants.USB_DIR_IN) { mUsbEndpointIn = ep; mUsbInterfaceInt = usbInterface; tvInfo.append("mUsbEndpointIn \n"); } else { mUsbEndpointOut = ep; musbInterfaceOut = usbInterface; tvInfo.append("mUsbEndpointOut \n"); } } } } if ((null == mUsbEndpointIn) || (null == mUsbEndpointOut)) { tvInfo.append("endpoint is null\n"); mUsbEndpointIn = null; mUsbEndpointOut = null; // mUsbInterface = null; } else { tvInfo.append("\nendpoint out: " + mUsbEndpointOut + ",endpoint in: " + mUsbEndpointIn.getAddress()+"\n"); // mUsbInterface = usbInterface; mUsbDeviceConnection = mUsbManager.openDevice(device); mUsbDeviceConnection.claimInterface(mUsbInterfaceInt, true); mUsbDeviceConnection.claimInterface(musbInterfaceOut, true); tvInfo.append("mUsbDeviceConnection: " + byteToString(mUsbDeviceConnection.getRawDescriptors()) + "\n"); // startReading(); } } /**将byte数组转换为可读性高的字符串*/ private String byteToString(byte[] b){ String result = ""; for (int i = 0; i < b.length; i++){ result = String.format("%s %02x", result, b[i]); } return result; } // USB设备插拔、授权的Receiver。 private final BroadcastReceiver mUsbReceiver = new BroadcastReceiver() { public void onReceive(Context context, Intent intent) { String action = intent.getAction(); tvInfo.append("BroadcastReceiver in\n"); if(UsbManager.ACTION_USB_DEVICE_ATTACHED.equals(action)) { tvInfo.append("ACTION_USB_DEVICE_ATTACHED\n"); UsbDevice device = (UsbDevice)intent.getParcelableExtra(UsbManager.EXTRA_DEVICE); initCommunication(device); } e