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分享求高手指点如何采集声卡输出声音
我在电脑上听歌,想做个程序录制听的歌并用波形显示。录制的声音是通过声卡的输出设备发出的，网上找了好多资料都是对麦克风输入的声音进行录制的，很少有关于声卡输出声音的录制。
求指点，谢谢各位了。。。。
求指点，谢谢各位了。。。。
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lpp8866 2012-12-27
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是不是用waveOutOpen()函数来采集扬声器数据？
q12161216 2012-12-27
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跪求大神指点
lpp8866 2012-12-27
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支持，同求，希望哪个大神发功
q12161216 2012-12-26
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高手。。。。上面代码，那块内容是从声卡读取声音的？？？？
潇潇雨云 2012-12-26
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把声音做成文件的
这里写错了
g_WavFmt.nBlockAlign = g_WavFmt.nChannels * g_WavFmt.wBitsPerSample / bits;
g_WavFmt.nAvgBytesPerSec = g_WavFmt.nChannels * g_WavFmt.wBitsPerSample / bits * g_WavFmt.nSamplesPerSec;
改成
g_WavFmt.nBlockAlign = g_WavFmt.nChannels * g_WavFmt.wBitsPerSample / 8;
g_WavFmt.nAvgBytesPerSec = g_WavFmt.nSamplesPerSec * g_WavFmt.nBlockAlign;
下面是自己的设定
int sps = 44100; // sample per seconds
int channels = 2; //numbers of channels
int bits = 16; //Bit rate
int wav_length_sec = 30; //Rec length (sec)
潇潇雨云 2012-12-26
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// consolea.cpp : Defines the entry point for the console application.
//
#include "stdafx.h"
#include <stdio.h>
#include <conio.h>
#include <windows.h>
#include <aviriff.h>
#include <iostream>
using namespace std;
//WAV format def
int sps = 44100; // sample per seconds
int channels = 1; //numbers of channels
int bits = 8; //Bit rate. Why does it not works with 16?
int wav_length_sec = 30; //Rec length (sec)
int WAVBUFFERLENGTH(channels * bits * sps/8 * wav_length_sec);
WAVEFORMATEX g_WavFmt = {0};
//Wave header length
int HEADERLENGTH (sizeof(RIFFLIST) + sizeof(RIFFCHUNK) + sizeof(WAVEFORMATEX) + sizeof(RIFFCHUNK));
void InitWavFmt(void)
{
g_WavFmt.wFormatTag = WAVE_FORMAT_PCM;
g_WavFmt.nChannels = channels;
g_WavFmt.nSamplesPerSec = sps;
g_WavFmt.wBitsPerSample = bits;
g_WavFmt.nBlockAlign = g_WavFmt.nChannels * g_WavFmt.wBitsPerSample / bits;
g_WavFmt.nAvgBytesPerSec = g_WavFmt.nChannels * g_WavFmt.wBitsPerSample / bits * g_WavFmt.nSamplesPerSec;
g_WavFmt.cbSize = 0;
}
char* AddWavHdr(char *pinBuffer, int inWavLength)
{
BYTE *pWavHdr = NULL;
RIFFLIST *pRiffWave = NULL;
RIFFCHUNK *pRiffFmt = NULL;
RIFFCHUNK *pRiffData = NULL;
char* outWavBuffer = NULL;
if (NULL == pinBuffer)
{
return NULL;
}
pWavHdr = new BYTE[HEADERLENGTH];
if ( NULL == pWavHdr)
{
return NULL;
}
else
{
memset(pWavHdr, 0, sizeof(BYTE) * HEADERLENGTH);
}
pRiffWave = (RIFFLIST*)pWavHdr;
pRiffFmt = (RIFFCHUNK*)(pRiffWave + 1);
pRiffData = (RIFFCHUNK*)(((BYTE*)(pRiffFmt + 1)) + sizeof(WAVEFORMATEX));
pRiffWave->fcc = FCC('RIFF');
pRiffWave->cb = inWavLength + HEADERLENGTH - sizeof(RIFFCHUNK);
pRiffWave->fccListType = FCC('WAVE');
pRiffFmt->fcc = FCC('fmt ');
pRiffFmt->cb = sizeof(WAVEFORMATEX);
pRiffData->fcc = FCC('data');
pRiffData->cb = inWavLength;
memcpy(pRiffFmt + 1, &g_WavFmt, pRiffFmt->cb);
outWavBuffer = (char*)new BYTE[inWavLength+HEADERLENGTH];
if (NULL == outWavBuffer)
{
return NULL;
}
else
{
memset(outWavBuffer, 0, sizeof(BYTE) * (inWavLength + HEADERLENGTH));
}
memcpy(outWavBuffer, pWavHdr, sizeof(BYTE) * HEADERLENGTH);
memcpy(outWavBuffer + HEADERLENGTH, pinBuffer, (sizeof(BYTE) * inWavLength));
return outWavBuffer;
}
void main ()
{
HWAVEIN hWavIn;
WAVEHDR WavHdr;
char *pBuffer = NULL;
char *pWavBuffer = NULL;
MMRESULT ret;
FILE *fpPCMFile;
FILE *fpWavFile;
MMTIME MMTime = {0};
unsigned int numwritten = 0;
MMTime.wType = TIME_BYTES;
InitWavFmt();
cout << "NumDev = " << waveInGetNumDevs() << endl;
if (0 == waveInGetNumDevs())
{
cout << "Audio device not found!\n";
exit(0);
}
ret = waveInOpen(&hWavIn, WAVE_MAPPER, &g_WavFmt, 0, 0, WAVE_FORMAT_QUERY);
if (MMSYSERR_NOERROR != ret)
{
cout << "Unsupported WAV format.\n";
exit(0);
}
ret = waveInOpen(&hWavIn, WAVE_MAPPER, &g_WavFmt, 0, 0, CALLBACK_NULL);
if (MMSYSERR_NOERROR != ret)
{
exit(0);
}
pBuffer = (char*)malloc(WAVBUFFERLENGTH);
if ( NULL != pBuffer)
{
memset(pBuffer, 0, WAVBUFFERLENGTH);
}
else
{
exit(0);
}
WavHdr.lpData = pBuffer;
WavHdr.dwBufferLength = WAVBUFFERLENGTH;
WavHdr.dwBytesRecorded = 0;
WavHdr.dwUser = 0;
WavHdr.dwFlags = 0;
WavHdr.dwLoops = 1;
WavHdr.lpNext = 0;
WavHdr.reserved = 0;
ret = waveInPrepareHeader(hWavIn,&WavHdr,sizeof(WAVEHDR));
if (MMSYSERR_NOERROR != ret)
{
free(pBuffer);
exit(0);
}
ret = waveInAddBuffer(hWavIn, &WavHdr, sizeof(WAVEHDR));
if (MMSYSERR_NOERROR != ret)
{
free(pBuffer);
exit(0);
cout <<"Press any key to start recording...\n";
_getch();
cout << "Recording now\n";
ret = waveInStart(hWavIn);
if (MMSYSERR_NOERROR != ret)
{
free(pBuffer);
exit(0);
}
cout << "Press any key to stop Recording\n";
_getch();
waveInGetPosition(hWavIn, &MMTime, sizeof(MMTime));
waveInReset(hWavIn);
cout << "sizeof MMTime = " << sizeof(MMTime) << endl;
waveInUnprepareHeader(hWavIn,&WavHdr,sizeof(WAVEHDR));
waveInClose(hWavIn);
fpPCMFile = fopen("pcm","w");
if (NULL == fpPCMFile)
{
cout <<"Creating PCM file failed\n";
free(pBuffer);
exit(0);
}
numwritten = fwrite(pBuffer, sizeof(char), MMTime.u.cb, fpPCMFile);
cout <<"Recording done, %d bytes recorded, %d bytes written: " << MMTime.u.cb << endl << " numwritten: " << numwritten;
fclose(fpPCMFile);
pWavBuffer = AddWavHdr(pBuffer, MMTime.u.cb);
if ( NULL == pWavBuffer)
{
cout <<"Add header failed\n";
}
else
{
fpWavFile = fopen("testfil.wav", "w");
if (NULL == fpWavFile)
{
cout <<"Creating WAV file failed\n";
}
else
{
numwritten = fwrite(pWavBuffer, sizeof(char), sizeof(BYTE) * (HEADERLENGTH + MMTime.u.cb), fpWavFile);
cout <<"%d bytes of WAV file written\n", numwritten;
fclose(fpWavFile);
free(pWavBuffer);
}
}
free(pBuffer);
_getch();
return;
}
}
q12161216 2012-12-26
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求大神指教。。。。。
