PortAudio枚举音频设备

前面我们说到了如何用Visual Studio编译portAudio，下面我们开始讲下如何使用PortAudio，先从最简单的开始，这篇文章我们主要讲如何枚举音频相关设备。代码如下：

#include <iostream>
#include <string>
#include <vector>
using namespace std;
#include "portaudio.h"
#pragma  comment(lib,"portaudio_x86.lib")
int main()
{
int     i, iNumDevices, defaultDisplayed;
const   PaDeviceInfo *deviceInfo;
//PaStreamParameters inputParameters, outputParameters;
PaError err;
//初始化
err = Pa_Initialize();
if( err != paNoError )
{
cout<<"Pa_Initialize error\r\n";
}
//获得设备数量
iNumDevices = Pa_GetDeviceCount();
if (iNumDevices < 0)
{
cout<<"Get device count error\r\n";
}
for (i = 0;i<iNumDevices;i++)
{
deviceInfo = Pa_GetDeviceInfo(i);
cout<<deviceInfo->name<<endl;		//打印设备名
}
getchar();
return 0;
}

#include <iostream>

#include <string>

#include <vector>

using namespace std;

#include "portaudio.h"

#pragma comment(lib,"portaudio_x86.lib")

int main()

{

int i, iNumDevices, defaultDisplayed;

const PaDeviceInfo *deviceInfo;

//PaStreamParameters inputParameters, outputParameters;

PaError err;

//初始化

err = Pa_Initialize();

if( err != paNoError )

{

cout<<"Pa_Initialize error\r\n";

}

//获得设备数量

iNumDevices = Pa_GetDeviceCount();

if (iNumDevices < 0)

{

cout<<"Get device count error\r\n";

}

for (i = 0;i<iNumDevices;i++)

{

deviceInfo = Pa_GetDeviceInfo(i);

cout<<deviceInfo->name<<endl; //打印设备名

}

getchar();

return 0;

}

如下是deviceinfo对应结构体声明：

/** A structure providing information and capabilities of PortAudio devices.
Devices may support input, output or both input and output.
*/
typedef struct PaDeviceInfo
{
int structVersion;  /* this is struct version 2 */
const char *name;
PaHostApiIndex hostApi; /**< note this is a host API index, not a type id*/
int maxInputChannels;
int maxOutputChannels;
/** Default latency values for interactive performance. */
PaTime defaultLowInputLatency;
PaTime defaultLowOutputLatency;
/** Default latency values for robust non-interactive applications (eg. playing sound files). */
PaTime defaultHighInputLatency;
PaTime defaultHighOutputLatency;
double defaultSampleRate;
} PaDeviceInfo;