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使用WindowsAPI獲取錄音音頻的方法

2020-01-26 15:23:39
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本文實(shí)例介紹了使用winmm.h進(jìn)行音頻流的獲取的方法,具體步驟如下:

一、首先需要包含以下引用對(duì)象

#include <Windows.h>#include "mmsystem.h"#pragma comment(lib, "winmm.lib")

二、音頻的獲取需要調(diào)用7個(gè)函數(shù)

1. waveInGetNumDevs:返回系統(tǒng)中就緒的波形聲音輸入設(shè)備的數(shù)量

UINT waveInGetNumDevs(VOID);

2. waveInGetDevCaps:檢查指定波形輸入設(shè)備的特性

MMRESULT waveInGetDevCaps(  UINT_PTR   uDeviceID,  LPWAVEINCAPS pwic,     UINT     cbwic    );//uDeviceID 音頻輸入設(shè)備標(biāo)識(shí),也可以為一個(gè)打開(kāi)的音頻輸入設(shè)備的句柄.//  個(gè)人認(rèn)為如果上一步獲得了多個(gè)設(shè)備,可以用索引標(biāo)識(shí)每一個(gè)設(shè)備.//  //pwic 對(duì)WAVEINCAPS結(jié)構(gòu)體的一個(gè)指針,包含設(shè)備的音頻特性.////cbwic WAVEINCAPS結(jié)構(gòu)體的大小,使用sizeof即可.////MMRESULT 函數(shù)執(zhí)行的結(jié)果//  MMSYSERR_NOERROR 表示執(zhí)行成功//  MMSYSERR_BADDEVICEID 索引越界 //  MMSYSERR_NODRIVER 沒(méi)有就緒的設(shè)備 //  MMSYSERR_NOMEM 不能分配或者鎖定內(nèi)存

介紹WAVEINCAPS結(jié)構(gòu)體的含義:

typedef struct {   WORD   wMid;        //音頻設(shè)備制造商定義的驅(qū)動(dòng)程序標(biāo)識(shí)  WORD   wPid;        //音頻輸入設(shè)備的產(chǎn)品標(biāo)識(shí)  MMVERSION vDriverVersion;    //驅(qū)動(dòng)程序版本號(hào)  TCHAR   szPname[MAXPNAMELEN];//制造商名稱  DWORD   dwFormats;      //支持的格式,參見(jiàn)MSDN  WORD   wChannels;      //支持的聲道數(shù)  WORD   wReserved1;      //保留參數(shù)} WAVEINCAPS;

3. waveInOpen:打開(kāi)指定的音頻輸入設(shè)備,進(jìn)行錄音

MMRESULT waveInOpen( LPHWAVEIN    phwi,        //接收打開(kāi)的音頻輸入設(shè)備標(biāo)識(shí)的HWAVEIN結(jié)構(gòu)的指針 UINT_PTR    uDeviceID,      //指定一個(gè)需要打開(kāi)的設(shè)備標(biāo)識(shí).可以使用WAVE_MAPPER選擇一個(gè)按指定錄音格式錄音的設(shè)備 LPWAVEFORMATEX pwfx,        //一個(gè)所需的格式進(jìn)行錄音的WAVEFORMATEX結(jié)構(gòu)的指針  DWORD_PTR   dwCallback,    //指向一個(gè)回調(diào)函數(shù)、事件句柄、窗口句柄、線程標(biāo)識(shí),對(duì)錄音事件進(jìn)行處理. DWORD_PTR   dwCallbackInstance, //傳給回調(diào)機(jī)制的參數(shù) DWORD     fdwOpen      //打開(kāi)設(shè)備的方法標(biāo)識(shí),指定回調(diào)的類型.參見(jiàn)CSDN);

介紹WAVEFORMATEX結(jié)構(gòu)體的含義:

typedef struct {   WORD wFormatTag;    //波形聲音的格式,單聲道雙聲道使用WAVE_FORMAT_PCM.當(dāng)包含在WAVEFORMATEXTENSIBLE結(jié)構(gòu)中時(shí),使用WAVE_FORMAT_EXTENSIBLE.  WORD nChannels;    //聲道數(shù)量  DWORD nSamplesPerSec;  //采樣率.wFormatTag為WAVE_FORMAT_PCM時(shí),有8.0kHz,11.025kHz,22.05kHz,和44.1kHz.  DWORD nAvgBytesPerSec;  //每秒的采樣字節(jié)數(shù).通過(guò)nSamplesPerSec * nChannels * wBitsPerSample / 8計(jì)算  WORD nBlockAlign;    //每次采樣的字節(jié)數(shù).通過(guò)nChannels * wBitsPerSample / 8計(jì)算  WORD wBitsPerSample;  //采樣位數(shù).wFormatTag為WAVE_FORMAT_PCM時(shí),為8或者16  WORD cbSize;      //wFormatTag為WAVE_FORMAT_PCM時(shí),忽略此參數(shù)} WAVEFORMATEX;

介紹dwCallback回調(diào)函數(shù)格式:

void CALLBACK waveInProc( HWAVEIN hwi,     //回調(diào)此函數(shù)的設(shè)備句柄 UINT uMsg,      //波形聲音輸入信息,標(biāo)識(shí)關(guān)閉(WIM_CLOSE)、緩沖區(qū)滿(WIM_DATA)、打開(kāi)(WIM_OPEN). DWORD_PTR dwInstance, //用戶在waveInOpen指定的數(shù)據(jù) DWORD_PTR dwParam1,  //(LPWAVEHDR)dwParam1,用戶指定的緩沖區(qū) DWORD_PTR dwParam2   );

4. waveInPrepareHeader:為音頻輸入設(shè)備準(zhǔn)備一個(gè)緩沖區(qū)

MMRESULT waveInPrepareHeader( HWAVEIN hwi,  //音頻輸入設(shè)備句柄 LPWAVEHDR pwh,//指向WAVEHDR結(jié)構(gòu)的指針,標(biāo)識(shí)準(zhǔn)備的緩沖區(qū) UINT cbwh    //WAVEHDR結(jié)構(gòu)的大小,使用sizeof即可);

介紹WAVEHDR結(jié)構(gòu):

typedef struct wavehdr_tag {   LPSTR   lpData;     //指向波形格式的緩沖區(qū)  DWORD   dwBufferLength; //緩沖區(qū)的大小  DWORD   dwBytesRecorded; //當(dāng)前存儲(chǔ)了多少數(shù)據(jù)  DWORD_PTR dwUser;     //用戶數(shù)據(jù)  DWORD   dwFlags;      //為緩沖區(qū)提供的信息,在waveInPrepareHeader函數(shù)中使用WHDR_PREPARED  DWORD   dwLoops;     //輸出時(shí)使用,標(biāo)識(shí)播放次數(shù)  struct wavehdr_tag * lpNext;//reserved  DWORD_PTR reserved;     //reserved} WAVEHDR, *LPWAVEHDR; 

5. waveInAddBuffer:將緩沖區(qū)發(fā)送給設(shè)備,若緩沖區(qū)填滿,則不起作用。(參數(shù)同上)

MMRESULT waveInAddBuffer( HWAVEIN hwi,  LPWAVEHDR pwh,  UINT cbwh ); 

6. waveInStart:開(kāi)始進(jìn)行錄制

MMRESULT waveInStart( HWAVEIN hwi //設(shè)備句柄);

7. waveInClose:關(guān)閉設(shè)備

MRESULT waveInClose( HWAVEIN hwi //設(shè)備句柄);

三、完整實(shí)例代碼如下:

//Run.c文件#include <Windows.h>#include <stdio.h>#include "mmsystem.h"#pragma comment(lib, "winmm.lib")void PlayMusi();void WaveInitFormat(LPWAVEFORMATEX m_WaveFormat, WORD nCh,DWORD nSampleRate,WORD BitsPerSample);DWORD CALLBACK MicCallback(HWAVEIN hwavein, UINT uMsg, DWORD dwInstance, DWORD dwParam1, DWORD dwParam2);void RecordWave();void main(){ //PlayMusi(); RecordWave(); while(1);}void RecordWave(){ int count = waveInGetNumDevs();//1 printf("/n音頻輸入數(shù)量:%d/n",count); WAVEINCAPS waveIncaps; MMRESULT mmResult = waveInGetDevCaps(0,&waveIncaps,sizeof(WAVEINCAPS));//2 printf("/n音頻輸入設(shè)備:%s/n",waveIncaps.szPname); if(MMSYSERR_NOERROR==mmResult) { HWAVEIN phwi; WAVEFORMATEX pwfx; WaveInitFormat(&pwfx,1,8000,8); printf("/n請(qǐng)求打開(kāi)音頻輸入設(shè)備"); printf("/n采樣參數(shù):?jiǎn)温暤?8kHz 8bit/n"); mmResult=waveInOpen(&phwi,WAVE_MAPPER,&pwfx,(DWORD)(MicCallback),NULL,CALLBACK_FUNCTION);//3 if(MMSYSERR_NOERROR==mmResult) {  WAVEHDR pwh1;  char buffer1[10240];  pwh1.lpData=buffer1;  pwh1.dwBufferLength=10240;  pwh1.dwUser=1;  pwh1.dwFlags=0;  mmResult=waveInPrepareHeader(phwi,&pwh1,sizeof(WAVEHDR));//4  printf("/n準(zhǔn)備緩沖區(qū)1");  WAVEHDR pwh2;  char buffer2[10240];  pwh2.lpData=buffer2;  pwh2.dwBufferLength=10240;  pwh2.dwUser=2;  pwh2.dwFlags=0;  mmResult=waveInPrepareHeader(phwi,&pwh2,sizeof(WAVEHDR));//4  printf("/n準(zhǔn)備緩沖區(qū)2/n");  if(MMSYSERR_NOERROR==mmResult)  {  mmResult=waveInAddBuffer(phwi,&pwh1,sizeof(WAVEHDR));//5  printf("/n將緩沖區(qū)1加入音頻輸入設(shè)備");  mmResult=waveInAddBuffer(phwi,&pwh2,sizeof(WAVEHDR));//5  printf("/n將緩沖區(qū)2加入音頻輸入設(shè)備/n");  if(MMSYSERR_NOERROR==mmResult)  {   mmResult=waveInStart(phwi);//6   printf("/n請(qǐng)求開(kāi)始錄音/n");  }  } } }}DWORD CALLBACK MicCallback(HWAVEIN hwavein, UINT uMsg, DWORD dwInstance, DWORD dwParam1, DWORD dwParam2){ switch(uMsg)  { case WIM_OPEN:  printf("/n設(shè)備已經(jīng)打開(kāi).../n");  break;  case WIM_DATA:  printf("/n緩沖區(qū)%d存滿.../n",((LPWAVEHDR)dwParam1)->dwUser);  waveInAddBuffer (hwavein, (LPWAVEHDR)dwParam1, sizeof (WAVEHDR)) ;  break;  case WIM_CLOSE:  printf("/n設(shè)備已經(jīng)關(guān)閉.../n");  break; default:  break; } return 0;}void WaveInitFormat(LPWAVEFORMATEX m_WaveFormat, WORD nCh,DWORD nSampleRate,WORD BitsPerSample){ m_WaveFormat->wFormatTag = WAVE_FORMAT_PCM; m_WaveFormat->nChannels = nCh; m_WaveFormat->nSamplesPerSec = nSampleRate; m_WaveFormat->nAvgBytesPerSec = nSampleRate * nCh * BitsPerSample/8; m_WaveFormat->nBlockAlign = m_WaveFormat->nChannels * BitsPerSample/8; m_WaveFormat->wBitsPerSample = BitsPerSample; m_WaveFormat->cbSize = 0;}void PlayMusi(){ int error = mciSendString("open C://Users//Angel//Desktop//有多少愛(ài)可以重來(lái).mp3 alias myDivece", NULL, 0, NULL); if (error == 0) { mciSendString("play myDivece", NULL, 0, NULL); //播放 }}
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