Wave file recording program

Question

Hi! to everyone..,

>>I am trying to write a program to record wave file  from mic connected to audio in port, and save it as  .wav file in current directory

>> So as I am searching on Internet I found following ways to do my program

                1. Using DirectX sdk

                2. Wave form API

>> I am using the Wave Form API to do my project

>> I read the whole document, but I am new to programming and vc++.

>>So any one please give me the steps  to do my project. I mean before use waveInOpen() function, what are the various things to consider like when to create  buffer,  when to create WAVEFORMATEX structure.

>>  Please anyone tell me design flow.Don't hesitate leave your valuable comments.

---

Srinath Adepu

Answer 1

Your function that is going to call waveInOpen should initialize a WAVEFORMATEX member variable before you call waveInOpen.

If you need to record continuously then for seamless transistions at the end of a buffer you need several buffers. Send two or more buffers to the device driver before you start recording so it will always have a fresh buffer available when it fills a buffer. The startup should look something like this:

m_nBufferSize = m_Format.nAvgBytesPerSec / BLOCK_PER_SECOND;
for (i = 0; i < NUM_BUFFERS; i++)
{
	m_pWaveHdr[i] = (LPWAVEHDR) new char[sizeof(WAVEHDR) + m_nBufferSize];
	m_pWaveHdr[i]->lpData = (char *)(m_pWaveHdr[i] + 1);
	m_pWaveHdr[i]->dwBufferLength = m_nBufferSize;
	m_pWaveHdr[i]->dwBytesRecorded = 0;
	m_pWaveHdr[i]->dwUser = 0;
	m_pWaveHdr[i]->dwFlags = 0;
	m_pWaveHdr[i]->dwLoops = 0;
	if (waveInPrepareHeader(m_hDevice, m_pWaveHdr[i], sizeof(WAVEHDR)))
		return FALSE;
	if (waveInAddBuffer(m_hDevice, m_pWaveHdr[i], sizeof(WAVEHDR)))
		return FALSE;
}
waveInStart(m_hDevice);