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Lcylib.h
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/*声卡音频实时函数库的应用程序接口头文件*/
#ifndef PORT_AUDIO_H
#define PORT_AUDIO_H
#ifdef __cplusplus
extern "C" {
#endif /* __cplusplus */
typedef enum {
paNoError = 0,
paHostError = -10000,
paInvalidChannelCount,
paInvalidSampleRate,
paInvalidDeviceId,
paInvalidFlag,
paSampleFormatNotSupported,
paBadIODeviceCombination,
paInsufficientMemory,
paBufferTooBig,
paBufferTooSmall,
paNullCallback,
paBadStreamPtr,
paTimedOut,
paInternalError
} PaErrorNum;
/*1.函数库的初始化函数，使用库之前，要先调用该函数。*/
int Pa_Initialize( void );
/*2.函数库的中止函数，使用库之后，要调用该函数。*/
int Pa_Terminate( void );
/*3.返回错误代码函数*/
long Pa_GetHostError( void );
/*4.翻译错误代码为人可读懂信息函数*/
const char *Pa_GetErrorText( int errnum );
/*(1)采样所得数据的格式定义*/
#define paFloat32 ((unsigned long) (1<<0))
#define paInt16 ((unsigned long) (1<<1))
#define paInt32 ((unsigned long) (1<<2))
#define paInt24 ((unsigned long) (1<<3))
#define paPackedInt24 ((unsigned long) (1<<4))
#define paInt8 ((unsigned long) (1<<5))
#define paUInt8 ((unsigned long) (1<<6))
#define paCustomFormat ((unsigned long) (1<<16))
#define paNoDevice -1
/*(2)声卡信息定义*/
typedef struct{
int structVersion;
const char *name;
int maxInputChannels;
int maxOutputChannels;
int numSampleRates;
const double *sampleRates;
unsigned long nativeSampleFormats;
} PaDeviceInfo;
/*5.获得声卡数量函数*/
int Pa_CountDevices();
/*6.获得声卡默认的输入端数量函数*/
int Pa_GetDefaultInputDeviceID( void );
/*7.获得声卡默认的输出端数量函数*/
int Pa_GetDefaultOutputDeviceID( void );
/*8.获得存储声卡信息地址函数*/
const PaDeviceInfo* Pa_GetDeviceInfo( int devID );
/*9.回调函数及参数说明：
inputBuffer and outputBuffer：采样的数据、格式、存储和通道数量。
framesPerBuffer：采样数据帧的数量。
outTime()：数据流时间。
userData：向数据流传送的数据。
*/
typedef int (PortAudioCallback)(
void *inputBuffer, void *outputBuffer,
unsigned long framesPerBuffer,
double outTime, void *userData );
/*(3)数据流属性定义*/
#define paNoFlag (0)
#define paClipOff (1<<0)
#define paDitherOff (1<<1)
#define paPlatformSpecificFlags (0x00010000)
/*10.打开输入或输出端的数据流，或两者同时打开函数。*/
int Pa_OpenStream( void** stream,
int inputDevice,
int numInputChannels,
unsigned long inputSampleFormat,
void *inputDriverInfo,
int outputDevice,
int numOutputChannels,
unsigned long outputSampleFormat,
void *outputDriverInfo,
double sampleRate,
unsigned long framesPerBuffer,
unsigned long numberOfBuffers,
unsigned long streamFlags,
PortAudioCallback *callback,
void *userData );
/*11.打开声卡默认的输入或输出端，或两者同时打开函数。*/
int Pa_OpenDefaultStream( void** stream,
int numInputChannels,
int numOutputChannels,
unsigned long sampleFormat,
double sampleRate,
unsigned long framesPerBuffer,
unsigned long numberOfBuffers,
PortAudioCallback *callback,
void *userData );
/*12.关闭数据流并清空缓冲区函数*/
int Pa_CloseStream( void* );
/*13.开始数据流函数*/
int Pa_StartStream( void *stream );
/*14.中止数据流函数，但要等缓冲区的数据空后。*/
int Pa_StopStream( void *stream );
/*15.立即中止数据流函数，不等缓冲区的数据空后。*/
int Pa_AbortStream( void *stream );
/* 16.数据流处理状况函数：返回１值，数据流正在进行；０值数据流没在进行；
负值：数据流无效。*/
int Pa_StreamActive( void *stream );
/*17.返回数据流要用的时间函数*/
double Pa_StreamTime( void *stream );
/*18.返回数据流占用CPU百分比函数，0.5表示占用50%。*/
double Pa_GetCPULoad( void* stream );
/*18.获得所需最小缓冲区函数*/
int Pa_GetMinNumBuffers( int framesPerBuffer, double sampleRate );
/*19.暂停函数，以微秒（msec）单位。*/
void Pa_Sleep( long msec );
/*20.返回bytes表示的采样数据大小函数*/
int Pa_GetSampleSize( unsigned long format );
#ifdef __cplusplus
}
#endif /* __cplusplus */
#endif /* PORT_AUDIO_H */
#include <math.h>
//#ifndef M_PI
//#define M_PI (2*asin(1))
//#endif
const double M_PI=2*asin(1.0);