Function ResampleSfx

code/client/snd_mem.cpp:210–253

================ ResampleSfx resample / decimate to the current source rate ================ */

================
*/
void ResampleSfx (sfx_t *sfx, int iInRate, int iInWidth, byte *pData)
{
	int		iOutCount;
	int		iSrcSample;
	float	fStepScale;
	int		i;
	int		iSample;
	unsigned int uiSampleFrac, uiFracStep;	// uiSampleFrac MUST be unsigned, or large samples (eg music tracks) crash

	fStepScale = (float)iInRate / dma.speed;	// this is usually 0.5, 1, or 2

	// When stepscale is > 1 (we're downsampling), we really ought to run a low pass filter on the samples

	iOutCount = (int)(sfx->iSoundLengthInSamples / fStepScale);
	sfx->iSoundLengthInSamples = iOutCount;

	sfx->pSoundData = (short *) SND_malloc( sfx->iSoundLengthInSamples*2 ,sfx );

	sfx->fVolRange	= 0;
	uiSampleFrac	= 0;
	uiFracStep		= (int)(fStepScale*256);

	for (i=0 ; i<sfx->iSoundLengthInSamples ; i++)
	{
		iSrcSample = uiSampleFrac >> 8;
		uiSampleFrac += uiFracStep;
		if (iInWidth == 2) {
			iSample = LittleShort ( ((short *)pData)[iSrcSample] );
		} else {
			iSample = (unsigned int)( (unsigned char)(pData[iSrcSample]) - 128) << 8;
		}

		sfx->pSoundData[i] = (short)iSample;

		// work out max vol for this sample...
		//
		if (iSample < 0)
			iSample = -iSample;
		if (sfx->fVolRange < (iSample >> 8) )
		{
			sfx->fVolRange =  iSample >> 8;
		}
	}
}


//=============================================================================