Spectrum Brands MC.31XX - Manual (Page 52)

52 MC.31xx Manual
Programming Standard acquisition modes
Example for SpcGetData, no memory allocation error checking performed:
If you use two channels for recording using only one memory channel or four channels, the data in the memory channel(s) is multiplexed and
needs to be unsorted by the user. The following example shows how to unsort the data for the recording of two channels using memory chan-
nel 0.
for (i = 0; i < 2; i++) // both memory channels have been used
pnData[i] = (ptr16) malloc (lMemsize * lBytesPerSample); // allocate memory for the data pointers
// with the maximum size (lMemsize)
SpcGetData (hDrv, 0, 0, lMemsize, (dataptr) pnData[0]); // no demultiplexing is necessary on channel 0
SpcGetData (hDrv, 1, 0, lMemsize, (dataptr) pnData[1]); // neither it is on channel 1
for (i = 0; i < 2; i++) // 2 channels to read out from 1 memory channel
pnData[i] = (ptr16) malloc (lMemsize * lBytesPerSample); // allocate memory for the data pointers
// with the maximum size (lMemsize) per channel
pnTmp = (ptr16) malloc (lMemsize * 2 * lBytesPerSample); // allocate temporary buffer for copy
SpcGetData (hDrv, 0, 0, 2 * lMemsize, (dataptr) pnTmp); // get both channels together
// from memory channel 0
for (i = 0; i < lMemsize; i++) // split data in the two channels
{
pnData[0][i] = pnTmp[(2 * i)];
pnData[1][i] = pnTmp[(2 * i) + 1];
}
free (pnTmp); // free the temporary buffer