VoiceEngine之voice hardware Demo

Target:  利用webrtc  voice engine 获取音频媒体设备信息

#include "webrtc\voice_engine\include\voe_base.h"
#include "webrtc\voice_engine\include\voe_hardware.h"
#include "webrtc\voice_engine\include\voe_errors.h"

VoiceEngine* pVoeEngine;
VoEHardware* pVoeHw;
VoEBase* pVoeBase ;

int main(int argc,char** argv)
{

    pVoeEngine = VoiceEngine::Create();            // Get VoideEngine Factory

          pVoeBase = VoEBase::GetInterface(pVoeEngine);  // Use Voe Factor to get Voe Interface

    pVoeBase->Init();       // Voe must init
    pVoeHw = VoEHardware::GetInterface(pVoeEngine);

   {

            int res = 0 ;
            int rd(0), pd(0);
            res = pVoeHw->GetNumOfRecordingDevices(rd);

            res = pVoeHw->GetNumOfPlayoutDevices(pd);


            char dn[128] = { 0 };
            char guid[128] = { 0 };
            printf("\nPlayout devices (%d): \n", pd);
            for (int j = 0; j < pd; ++j) {
              res = pVoeHw->GetPlayoutDeviceName(j, dn, guid);

              printf("  %d: %s \n", j, dn);
            }

            printf("Recording devices (%d): \n", rd);
            for (int j = 0; j < rd; ++j) {
              res = pVoeHw->GetRecordingDeviceName(j, dn, guid);

              printf("  %d: %s \n", j, dn);
            }

            printf("Select playout device: ");
            //ASSERT_EQ(1, scanf("%d", &pd));
            res = pVoeHw->SetPlayoutDevice(pd);

            printf("Select recording device: ");
            //ASSERT_EQ(1, scanf("%d", &rd));
            printf("Setting sound devices \n");
            res = pVoeHw->SetRecordingDevice(rd);

        }

}

VoiceEngine和VideoEngine一样， 使用Factory Model模式，Factory Model使用流程：
1.  创建VoiceEngine或者VideoEngine, 例如： VoiceEngine::Create() 
2.  获取Engine的Interface, VoEBase::GetInterface(), Engine Interface获取必须init();
3. 在factory下，有很多interface,都可以利用2中方法获取。
4.  使用完释放:    Terminate(),每个interface都要release();最后VoiceEngine::Delete( engine object);