Thread: Trouble recording sound

Hi guys,

hopefully you're not getting sick of me yet. basically, I'm trying to record sound coming in from the line-in socket. I've seen quite a few C++ examples but I haven't seen any C ones and I don't particularly won't to go delving into C++ just for the sake of one thing I want to do. I'm using Microsoft Visual Studio 6 Professional edition and running Windows XP SP2.

Below is the code I currently have. When startRecording() is called, "wim open" is displayed but I'm a bit stuck there, am I supposed to load all the data coming through into memory and if so, how do I go about doing that, I've tried looking through the FAQ, all the forums, on MSDN and I guess I'm just stupid (or very sleep deprived). Basically, once it finished recording I want it saved as a .wav file, but I'll try to figure that out later, baby steps is the key

By the way, I've used waveInGetDevCaps() to store the data of the input device already.

Code:

/* in sound.h */
WAVEFORMATEX pcmWaveFormat;
HWAVEIN m_hRecord;
LPWAVEHDR pHdr;

/* part of sound.c */

char buf[512];

void CALLBACK m_ThreadID(HWAVEIN hwi, UINT uMessage, DWORD dwInstance, DWORD dwParam1, DWORD dwParam2)
{
	switch(uMessage) {
		case MM_WIM_OPEN:
			sprintf(buf, "wim open");
			break;
		case MM_WIM_CLOSE:
			sprintf(buf, "wim close");
			break;
		case MM_WOM_DONE:
			sprintf(buf, "wom done");
			break;
		case MM_WIM_DATA:
			sprintf(buf, "wim data");
			break;
		default:
			break;
	}
	MessageBox(NULL, buf, "Debug", MB_OK);
}

void startRecording(void)
{
	char err[256] = "";
	int i = 0;

	pHdr = (LPWAVEHDR) GlobalLock(GlobalAlloc(GHND, sizeof(WAVEHDR)));

//	if(isPlaying) {
//		MessageBox(hwndMain, "You are currently playing a file", "Error", MB_ICONERROR|MB_OK);
//		return;
//	}
//	if(isRecording) {
//		MessageBox(hwndMain, "You are already recording a file", "Error", MB_ICONERROR|MB_OK);
//		return;
//	}

	isRecording = 1;

	m_hRecord = NULL;

	pcmWaveFormat.wFormatTag	= WAVE_FORMAT_PCM;
	pcmWaveFormat.cbSize		= 0;
	pcmWaveFormat.wBitsPerSample = 16;
	pcmWaveFormat.nSamplesPerSec = 22050;
	pcmWaveFormat.nChannels = 2;
	pcmWaveFormat.nAvgBytesPerSec	= pcmWaveFormat.nSamplesPerSec*(pcmWaveFormat.wBitsPerSample/8);
	pcmWaveFormat.nBlockAlign		= pcmWaveFormat.nChannels     *(pcmWaveFormat.wBitsPerSample/8);

	if(i = waveInOpen(&m_hRecord, WAVE_MAPPER, &pcmWaveFormat, (DWORD)m_ThreadID, 0, CALLBACK_FUNCTION))
	{
		waveInGetErrorText(i, err, 255);
		sprintf(buf, "WAVEIN Open (%d): %s", i, err);
		MessageBox(NULL, buf, "Error", MB_ICONERROR|MB_OK);
		return;
	}

	if(i = waveInPrepareHeader(m_hRecord, pHdr, sizeof(WAVEHDR)))
	{
		waveInGetErrorText(i, err, 255);
		sprintf(buf, "WAVEIN PrepareHeader (%d): %s", i, err);
		MessageBox(NULL, buf, "Error", MB_ICONERROR|MB_OK);
		return;
	}

	if(i = waveInAddBuffer(m_hRecord, pHdr, sizeof(WAVEHDR)))
	{
		waveInGetErrorText(i, err, 255);
		sprintf(buf, "WAVEIN AddBudder (%d): %s", i, err);
		MessageBox(NULL, buf, "Error", MB_ICONERROR|MB_OK);
		return;
	}

	if(i = waveInStart(m_hRecord))
	{
		waveInGetErrorText(i, err, 255);
		sprintf(buf, "WAVEIN InStart (%d): %s", i, err);
		MessageBox(NULL, buf, "Error", MB_ICONERROR|MB_OK);
		return;
	}

        /* save file */
	/* clean up */
	/* let them know it's done */
	return;
}

I hope I'm going through the right process. There should be a library for this :P

Thanks in advance,

Daniel Wallace

Never mind guys, I took a look at FMOD and realised that it can be used for recording also.

All sorted, including saving to a wav file (go wotsit)