windows麦克风输入采集

作者： 使徒保罗

邮箱：[e-mail]

声明：您可以自由使用本文代码，如有任何疑问可通过群414742203交流

环境：win10 64位+qt5.7(mingw)

功能：qt调用The Windows Audio Session API (WASAPI)， MMDeviceAPI采集声卡示例代码最低系统要求：客户端Windows Vista，服务器Windows Server 2008，手机Windows Phone 8

参考：https://msdn.microsoft.com/en-us/library/dd370800(v=vs.85).aspx

pro文件:

QT += core

QT -= gui

CONFIG += c++11

TARGET = WindowsCoreAduioDemo

CONFIG += console

CONFIG -= app_bundle

TEMPLATE = app

SOURCES += main.cpp

LIBS += -L$$PWD/lib/ -lOle32

main.cpp文件：

#include <QCoreApplication>

#include <Windows.h>

#include <MMDeviceAPI.h>

#include <AudioClient.h> //WSAPI

#include <AudioPolicy.h> //WSAPI

#define MAX_AUDIO_FRAME_SIZE 192000

#define SAFE_RELEASE(punk) \

            if((NULL != punk)) \

            { (punk)->Release(); (punk)=NULL; }

int main(int argc, char *argv[])

{

    QCoreApplication a(argc, argv);

    IAudioClient *      _AudioClient = NULL;

    IAudioCaptureClient *_CaptureClient = NULL;

    IMMDevice * _Device = NULL;

    IMMDeviceEnumerator * _DeviceEnumerator = NULL;

    HANDLE _AudioSamplesReadyEvent = NULL;

    WAVEFORMATEX *      _MixFormat = NULL;

    BYTE *pBuffer = NULL;

    //初始化Com库

    HRESULT hr = CoInitializeEx(NULL, COINIT_MULTITHREADED);

    if(hr != S_OK)

    {

        printf("初始化Com库失败\n");

        return -1;

    }

    //创建Com对象IMMDeviceEnumerator

    hr = CoCreateInstance(__uuidof(MMDeviceEnumerator), NULL, CLSCTX_INPROC_SERVER, IID_PPV_ARGS(&_DeviceEnumerator));

    if (FAILED(hr))

    {

       printf("Unable to retrieve CoCreateInstance %x\n", (long)hr);

       return false;

    }

    //获取声音播放设备对象IMMDevice

    hr = _DeviceEnumerator->GetDefaultAudioEndpoint(eCapture,eMultimedia,&_Device);

    if (FAILED(hr))

    {

       printf("Unable to retrieve device %x\n", hr);

       return false;

    }

    //释放IMMDeviceEnumerator对象

    SAFE_RELEASE(_DeviceEnumerator)

    //在音频数据拷贝之前要添加一个引用,

    _Device->AddRef();

    //创建Com对象IAudioClient

   hr = _Device->Activate(__uuidof(IAudioClient), CLSCTX_INPROC_SERVER, NULL, reinterpret_cast<void **>(&_AudioClient));

   if (FAILED(hr))

   {

       printf("Unable to activate audio client: %x.\n", hr);

       return false;

   }

   //获取音频引擎内如共享模式程序的音频流格式

   hr = _AudioClient->GetMixFormat(&_MixFormat);

   if (FAILED(hr))

   {

       printf("Unable to get mix format on audio client: %x.\n", hr);

       return false;

   }

   //wBitsPerSample是采样深度(位深)  nChannels是音频通道数 _FrameSize一个采样的大小(字节)

   size_t _FrameSize = (_MixFormat->wBitsPerSample / 8) * _MixFormat->nChannels;

   //初始化音频引擎

   /*

    *AUDCLNT_SHAREMODE_SHARED设置共享模式

    *AUDCLNT_STREAMFLAGS_EVENTCALLBACK允许设置事件通知回调 SetEventHandle才会有效果

    */

   hr = _AudioClient->Initialize(AUDCLNT_SHAREMODE_SHARED, AUDCLNT_STREAMFLAGS_EVENTCALLBACK, 0, 0, _MixFormat, NULL);

   if (FAILED(hr))

   {

       printf("Unable to initialize audio client: %x.\n", hr);

       return false;

   }

   _AudioSamplesReadyEvent = CreateEvent(NULL, FALSE, FALSE, NULL);

   if (_AudioSamplesReadyEvent == NULL)

   {

       printf("Unable to create samples ready event: %d.\n", GetLastError());

       return false;

   }

   //设置事件通知对象

   hr = _AudioClient->SetEventHandle(_AudioSamplesReadyEvent);

   if (FAILED(hr))

   {

       printf("Unable to set ready event: %x.\n", hr);

       return false;

   }

   //生成采集服务

   hr = _AudioClient->GetService(IID_PPV_ARGS(&_CaptureClient));

   if (FAILED(hr))

   {

       printf("Unable to get new capture client: %x.\n", hr);

       return false;

   }

   //开始采集

   hr = _AudioClient->Start();

   if (FAILED(hr))

   {

       printf("Unable to get new capture client: %x.\n", hr);

       return false;

   }

   pBuffer=new BYTE[MAX_AUDIO_FRAME_SIZE];

   while (TRUE)

   {

       DWORD waitResult = WaitForSingleObject(_AudioSamplesReadyEvent, INFINITE);

       BYTE *pData = NULL;

       INT nBufferLenght = 0;

       UINT32 framesAvailable = 0;

       DWORD  flags = 0;

       hr = _CaptureClient->GetBuffer(&pData, &framesAvailable, &flags, NULL, NULL);

       if (SUCCEEDED(hr))

       {

           if (framesAvailable!=0)

           {

               if (flags & AUDCLNT_BUFFERFLAGS_SILENT)

               {

                   //告诉Copy Data写静音

                   pData = NULL;

               }

               else

               {                  

                   //Copy data from the audio engine buffer to the output buffer.

                   int nDataLen = framesAvailable*_FrameSize;

                   CopyMemory(pBuffer,pData,nDataLen);

                   printf("get capture audio len: %d!\n", nDataLen);

               }

           }          

       }

       _CaptureClient->ReleaseBuffer(framesAvailable);

   }

   delete[] pBuffer;

   SAFE_RELEASE(_DeviceEnumerator)

   SAFE_RELEASE(_Device)

   SAFE_RELEASE(_DeviceEnumerator)

   SAFE_RELEASE(_DeviceEnumerator)

   SAFE_RELEASE(_DeviceEnumerator)

   CoUninitialize();

   return a.exec();

}