I feel so close to you right now！

最近笔记本的音响坏了，郁闷啊、纠结中，有一个想法：捕获电脑的声音，这个声音可以是movie的声音、music的声音、或者系统的声音，只要是经过声卡播放的声音，都可以捕获。然后通过usb发送到手机上播放，也可以通过wifi发送到手机播放。

看看怎么做，可以使用微软发布的DirectX SDK，我使用的是DirectX 10 SDK，很多地方可以下载到这个sdk， 大小500M左右。在sdk的目录DirectX 10 SDK\Samples\C++\DirectSound下，有一个例子CaptureSound，CaptureSound是用来捕获声音的，它一面捕获声音，一面写进一个wav的文件里。修改这个例子，把捕获的声音立即发送给手机，可以通过usb发送、或者wifi。

首先设置pc的录音通道，在电脑的托盘上，双击小喇叭，菜单“选项”->“属性”，选择“录音”，只勾选“立体声混音”。看一下效果：

 

转载，请写明出处：

usb通信时这样的：

在pc上使用adb命令：adb forward tcp:4626 tcp:4883，在PC上建立4626端口通信数据将被重定向到手机端server的4883端口；然后初始化socket，连接到手机4626端口，进行socket通信。PC端代码如下：

 

DWORD WINAPI usbThreadFunc(LPVOID threadNum) { int length; CString temp; if(!initAdb())//adb init { MessageBox(0, L"初始化手机出错！", L"提示", MB_OK); return 0; } if(!InItClientSock())//socket init { MessageBox(0, L"初始化IP地址出错！", L"提示", MB_OK); return 0; } if(!USBConnectSock((HWND)threadNum))//connect socket { MessageBox(0, L"连接IP地址出错！", L"提示", MB_OK); return 0; } //等待连接的时候，连接可能被取消。 if(clientThreadRun) { } else { MessageBox(0, L"用户取消！", L"提示", MB_OK); return 0; } SetDlgItemText( (HWND)threadNum, IDC_SOUNDFILE, TEXT("&USB Disconnect") ); EnableWindow( GetDlgItem( (HWND)threadNum, IDC_RECORD ), TRUE ); EnableWindow( GetDlgItem( (HWND)threadNum, IDC_BUTTON_WIFI ), FALSE ); while(clientThreadRun) { if( (length = recv(clientSock,(char*)recv_message_client,sizeof(recv_message_client),0))>0) { memset(recv_message_client, 0, sizeof(recv_message_client)); LogPrintf(recv_message_client); } } return 0; }

 

这里说道最重要的是捕获声音，下面的代码启动了一个线程来处理捕获到的声音：

DWORD WINAPI captureThreadFunc(LPVOID hDlg) { DWORD dwResult; while(g_bRecording) { dwResult = MsgWaitForMultipleObjects( 1, &g_hNotificationEvent, FALSE, INFINITE, QS_ALLEVENTS ); switch( dwResult ) { case STATUS_WAIT_0://case WAIT_OBJECT_0 + 0: RecordCapturedData(); break; } } return 0; }

 

在创建捕获声音的设备的时候，会创建一个事件，这个事件就是捕获到一定长度的声音之后（比如2K大小的声音），会发出一个通知，告诉你去处理。上面的线程，就是一直待等待这个事件，然后再去处理捕获到的声音，把声音发送给socket，交给手机处理，代码：

HRESULT RecordCapturedData() { HRESULT hr; VOID* pbCaptureData = NULL; DWORD dwCaptureLength; VOID* pbCaptureData2 = NULL; DWORD dwCaptureLength2; DWORD dwReadPos; DWORD dwCapturePos; LONG lLockSize; if( NULL == g_pDSBCapture ) return S_FALSE; if( FAILED( hr = g_pDSBCapture->GetCurrentPosition( &dwCapturePos, &dwReadPos ) ) ) return DXTRACE_ERR_MSGBOX( TEXT("GetCurrentPosition"), hr ); lLockSize = dwReadPos - g_dwNextCaptureOffset; if( lLockSize < 0 ) lLockSize += g_dwCaptureBufferSize; // Block align lock size so that we are always write on a boundary lLockSize -= (lLockSize % g_dwNotifySize); if( lLockSize == 0 ) return S_FALSE; // Lock the capture buffer down if( FAILED( hr = g_pDSBCapture->Lock( g_dwNextCaptureOffset, lLockSize, &pbCaptureData, &dwCaptureLength, &pbCaptureData2, &dwCaptureLength2, 0L ) ) ) return DXTRACE_ERR_MSGBOX( TEXT("Lock"), hr ); // Write the data to socket发送给手机 socketSend(pbCaptureData,dwCaptureLength); // Move the capture offset along g_dwNextCaptureOffset += dwCaptureLength; g_dwNextCaptureOffset %= g_dwCaptureBufferSize; // Circular buffer if( pbCaptureData2 != NULL ) { // Write the data to socket发送给手机 socketSend(pbCaptureData2,dwCaptureLength2); // Move the capture offset along g_dwNextCaptureOffset += dwCaptureLength2; g_dwNextCaptureOffset %= g_dwCaptureBufferSize; // Circular buffer } // Unlock the capture buffer g_pDSBCapture->Unlock( pbCaptureData, dwCaptureLength, pbCaptureData2, dwCaptureLength2 ); return S_OK; }

 

通过socket发送数据的代码很简单，没有任何处理捕获到的声音数据，就发送给手机了

VOID socketSend(VOID* send_message, int length) { if(clientSockConnect==0) { int send_len = length; char * buf = (char*)send_message; while(send_len>0) { int rc = send(clientSock,buf,send_len, 0);//MSG_OOB if (rc < 1)//if (rc == SOCKET_ERROR || rc == 0) { break; } send_len -= rc; buf += rc; } buf = NULL; } }

手机端的代码如下，注意手机上audioTrack的设置：44100，AudioFormat.CHANNEL_CONFIGURATION_STEREO，AudioFormat.ENCODING_PCM_16BIT。在启动电脑捕获声音的时候也要同样的设置，否则播放的声音是杂音：

public class TcpConnect extends Thread { private ServerSocket mServerSocket; private Socket mClient; private Handler mHandler; private boolean running = false; private boolean palying = false; private int audioPlayBufSize; private AudioTrack audioTrack; private static final int frequency = 44100; private static final int channelConfiguration = AudioFormat.CHANNEL_CONFIGURATION_STEREO; private static final int audioEncoding = AudioFormat.ENCODING_PCM_16BIT; private ArrayList<byte[]> inBuf = new ArrayList<byte[]>(); public TcpConnect(Handler handler) { mHandler = handler; audioPlayBufSize = AudioTrack.getMinBufferSize(frequency, channelConfiguration, audioEncoding); audioTrack = new AudioTrack( AudioManager.STREAM_MUSIC,// .STREAM_RING,//.STREAM_MUSIC, frequency, channelConfiguration, audioEncoding, audioPlayBufSize, AudioTrack.MODE_STREAM); audioTrack.setStereoVolume(1.0f, 1.0f); Log.d("playPCAudio", "audioPlayBufSize: " + audioPlayBufSize); palying = false; inBuf.clear(); } public void run() { try { mServerSocket = new ServerSocket(4883); System.out.println("TcpConnect" + "开始监听"); mClient = mServerSocket.accept(); System.out.println("TcpConnect" + "检测到有连接"); InputStream is = mClient.getInputStream(); running = true; int readLen = 0; byte[] readBuf = new byte[audioPlayBufSize]; System.out.println("TcpConnect" + "接收"); playThread palyt = new playThread(); palyt.setPriority(Thread.MAX_PRIORITY); palyt.start(); while (running) { if ((readLen = is.read(readBuf, 0, audioPlayBufSize)) > 0) { byte[] tmpBuf = new byte[readLen]; System.arraycopy(readBuf, 0, tmpBuf, 0, readLen); synchronized (inBuf) { inBuf.add(tmpBuf); } } } } catch (Exception e) { System.out.println("TcpConnect TCP error:" + e.getMessage()); } System.out.println("TcpConnect over"); } class playThread extends Thread { public playThread() { } public void run() { audioTrack.play(); palying = true; while (running) { ArrayList<byte[]> buf = new ArrayList<byte[]>(); buf.clear(); synchronized (inBuf) { if (inBuf.size() == 0) continue; buf = (ArrayList<byte[]>) inBuf.clone(); inBuf.clear(); } for (int i = 0; i < buf.size(); i++) { byte[] tmpBuf = buf.get(i); audioTrack.write(tmpBuf, 0, tmpBuf.length); } } if (palying) { audioTrack.stop(); audioTrack.release(); palying = false; } } } }

我的博客：

PC和手机的代码下载地址：

大家在捕获声音的时候，可能会出现杂音，需要调试，请留言。

有需要的同学在这里下载：
已经上传到百度网盘，里面有使用说明。CSDN的下载链接需要积分，无法修改。