本文实例讲述了C语言使用libZPlay录制声音并写到文件的方法。分享给大家供大家参考。具体实现方法如下：
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/**
* Record samples from line-in and save to out.mp3
*
*/
#define WIN32_LEAN_AND_MEAN
#include <windows.h>
#include <olectl.h>
#include <ole2.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <conio.h>
#include <dos.h>
#include <conio.h>
#include "../include/libzplay.h"
using namespace libZPlay;
ZPlay* player;
int nRate = 100;
int nPitch = 100;
int nTempo = 100;
int fCenterCut = 0;
int fSideCut = 0;
int fMixChannels = 0;
int lVolume = 100;
int rVolume = 100;
int fPause = 0;
int fEcho = 0;
int fEq = 0;
int fReverse = 0;
TStreamStatus status;
TStreamTime pos;
int main(int argc, char **argv)
{
// clear screen
system("CLS");
// create class instance
player = CreateZPlay();
// chek if we have class instance
if(player == 0)
{
printf("Error: Can't create class instance !\nPress key to exit.\n");
getch();
return 0;
}
// get library version
int ver = player->GetVersion();
// check if we have version 2.00 and above
if(ver < 200)
{
printf("Error: Need library version 2.00 and above !\nPress key to exit.\r\n");
getch();
player->Release();
return 0;
}
// display version info
printf("libZPlay v.%i.%02i\r\n\r\n", ver / 100, ver % 100);
printf( "x: play \tj: fade out \ti: side cut \td: pitch down\r\n"
"c: pause \tk: fade in \to: center cut \tf: pitch up\r\n"
"v: stop \tl: loop \tn: volume down\tg: tempo down\r\n"
"y: rew \tp: equalizer \tm: volume up \th: tempo up\r\n"
"b: fwd \te: echo \ta: rate down \r\n"
"r: reverse \tt: channel mix\ts: rate up \tq: quit\r\n\r\n");
// open wavein using Line In
if(player->OpenFile("wavein://src=line;volume=50;", sfAutodetect) == 0)
{
printf("Error: %s\nPress key to exit.\r\n", player->GetError());
getch();
player->Release();
return 0;
}
// set wave output to disk file, mp3 encoding
if(player->SetWaveOutFile("out.mp3", sfMp3, 1) == 0)
{
printf("Error: %s\nPress key to exit.\r\n", player->GetError());
getch();
player->Release();
return 0;
}
// get stream info
TStreamInfo pInfo;
player->GetStreamInfo(&pInfo);
// display info about stream
char *sVbr = "CBR";
if(pInfo.VBR)
sVbr = "VBR";
printf("\r\n%s %i Hz %s Channel: %u Length: %02i:%02i:%02i:%02i\r\n\r\n",
pInfo.Description,
pInfo.SamplingRate,
sVbr,
pInfo.ChannelNumber,
pInfo.Length.hms.hour,
pInfo.Length.hms.minute,
pInfo.Length.hms.second,
pInfo.Length.hms.millisecond);
printf("Status| kbps | POS: |Echo|Equ|Cut|Fade|Rev|Rate|Pitch|Tempo|Vol|Loop|Ch mix|\r\n");
// start playing
if(player->Play() == 0)
{
printf("Error: %s\nPress key to exit.\r\n", player->GetError());
player->Release(); // delete ZPlay class
return 0;
}
while(1)
{
// get current status
player->GetStatus(&status);
char *st = 0;
if(status.fPlay)
st = "Play ";
else if(status.fPause)
st = "Pause";
else
st = "Stop ";
// get current position
player->GetPosition(&pos);
printf("%s %04i %02i:%02i:%02i %i %i %i %i %i %03i %03i %03i %03i %i %i\r",
st,
player->GetBitrate(0),
pos.hms.hour,
pos.hms.minute,
pos.hms.second,
status.fEcho,
status.fEqualizer,
status.fVocalCut,
status.fSlideVolume,
status.fReverse,
player->GetRate(),
player->GetPitch(),
player->GetTempo(),
lVolume,
status.nLoop,
fMixChannels
);
if(kbhit())
{
int a = getch();
switch(a)
{
case 'i': // side cut
fSideCut = !fSideCut;
player->StereoCut(fSideCut, 1, 0);
fCenterCut = 0;
break;
case 'o': // center
fCenterCut = !fCenterCut;
player->StereoCut(fCenterCut, 0, 0);
fSideCut = 0;
break;
case 's': // higher rate
nRate += 5;
player->SetRate(nRate);
break;
case 'a': // lower rate
nRate -= 5;
if(nRate < 0)
nRate = 0;
player->SetRate(nRate);
break;
case 'd': // lower pitch
nPitch -= 5;
if(nPitch < 0)
nPitch = 0;
player->SetPitch(nPitch);
break;
case 'f': // higher pitch
nPitch += 5;
player->SetPitch(nPitch);
break;
case 'g': // lower tempo
nTempo -= 5;
if(nTempo < 0)
nTempo = 0;
player->SetTempo(nTempo);
break;
case 'h': // higher tempo
nTempo += 5;
player->SetTempo(nTempo);
break;
case 'r': // reverse mode
fReverse = !fReverse;
if(player->ReverseMode(fReverse) == 0)
{
printf("Error: %s\n", player->GetError());
fReverse = 0;
}
break;
case 'p': // enable or disable equalizer
{
fEq = !fEq;
player->EnableEqualizer(fEq);
if(fEq)
{
player->SetEqualizerPreampGain(-100000);
player->SetEqualizerBandGain(0, 104000);
player->SetEqualizerBandGain(1, 104000);
player->SetEqualizerBandGain(2, 104000);
}
}
break;
case 'l': // play loop
{
TStreamTime pCurrentTime;
player->GetPosition(&pCurrentTime);
TStreamTime pEndTime;
pEndTime.ms = pCurrentTime.ms + 5000;
player->PlayLoop(tfMillisecond, &pCurrentTime, tfMillisecond, &pEndTime ,5, 1);
}
break;
case 'j': // fade out volume
{
TStreamTime start;
TStreamTime end;
player->GetPosition(&start);
end.sec = start.sec + 5;
player->SlideVolume( tfSecond, &start, 100,100, tfSecond, &end, 0,0);
}
break;
case 'k': // fade in volume
{
TStreamTime start;
player->GetPosition(&start);
TStreamTime end;
end.sec = start.sec + 5;
player->SlideVolume( tfSecond, &start, 0,0, tfSecond, &end, 100, 100);
}
break;
case 'e': // enable echo
{
fEcho = !fEcho;
player->EnableEcho(fEcho);
}
break;
case 'x': // play
if(player->Play() == 0)
printf("Err: %s\n", player->GetError());
fPause = 0;
break;
case 'v': // stop
player->Stop();
fPause = 0;
break;
case 'c': // pause
if(fPause)
{
player->Resume();
fPause = 0;
}
else
{
player->Pause();
fPause = 1;
}
break;
case 'y': // jump back 5 seconds
{
TStreamTime pTime;
pTime.sec = 5;
player->Seek(tfSecond, &pTime, smFromCurrentBackward);
}
break;
case 'b': // jump forward 5 seconds
{
TStreamTime pTime;
pTime.sec = 5;
player->Seek(tfSecond, &pTime, smFromCurrentForward);
}
break;
case 't':
{
// mix stereo channels to mono
fMixChannels = !fMixChannels;
player->MixChannels(fMixChannels, 50, 50);
}
break;
case 'n': // volume down
if(lVolume >= 5)
lVolume -= 5;
if(rVolume >= 5)
rVolume -= 5;
player->SetMasterVolume(lVolume, rVolume);
break;
case 'm': // volume up
if(lVolume <= 95)
lVolume += 5;
if(rVolume <= 95)
rVolume += 5;
player->SetMasterVolume(lVolume, rVolume);
break;
case 'q':
case 'Q':
player->Release();
return 0;
}
}
Sleep(50);
}
}
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希望本文所述对大家的C语言程序设计有所帮助。