void MixerAdd(Mixer *mix, Waveform *in1, Waveform *in2, Waveform *out)
{
int n;
CopyWaveform(in1, out);
if (in1->num_samples == in2->num_samples)
{
for (n = 0; n < in1->num_samples; n++)
{
out->samples[n] = in1->samples[n] * mix->gain_in1 + in2->samples[n] * mix->gain_in2;
}
}
else
{
CopyWaveform(in1, out);
}
}
int ReceiveWaveform (SinkVChan_type* sinkVChan, Waveform_type** waveform, WaveformTypes* waveformType, char** errorMsg)
{
#define ReceiveWaveform_Err_NoWaveform -1
#define ReceiveWaveform_Err_WrongDataType -2
#define ReceiveWaveform_Err_NotSameDataType -3
INIT_ERR
DataPacket_type* dataPacket = NULL;
DLDataTypes dataPacketType = 0;
DLDataTypes firstDataPacketType = 0;
void* dataPacketPtrToData = NULL;
char* msgBuff = NULL;
// init
*waveform = NULL;
// get first data packet and check if it is a NULL packet
errChk ( GetDataPacket(sinkVChan, &dataPacket, &errorInfo.errMsg) );
if (!dataPacket) {
nullChk( msgBuff = StrDup("Waveform received does not contain any data. This occurs if a NULL packet is encountered before any data packets") );
SET_ERR(ReceiveWaveform_Err_NoWaveform, msgBuff);
}
// check if data packet type is supported by this function
dataPacketPtrToData = GetDataPacketPtrToData(dataPacket, &firstDataPacketType);
dataPacketType = firstDataPacketType;
// check if data packet is of waveform type
switch (firstDataPacketType) {
case DL_Waveform_Char:
case DL_Waveform_UChar:
case DL_Waveform_Short:
case DL_Waveform_UShort:
case DL_Waveform_Int:
case DL_Waveform_UInt:
case DL_Waveform_Int64:
case DL_Waveform_UInt64:
case DL_Waveform_SSize:
case DL_Waveform_Size:
case DL_Waveform_Float:
case DL_Waveform_Double:
break;
default:
nullChk( msgBuff = StrDup("Data packet received is not of a waveform type and cannot be retrieved by this function") );
SET_ERR(ReceiveWaveform_Err_WrongDataType, msgBuff);
break;
}
errChk( CopyWaveform(waveform, *(Waveform_type**)dataPacketPtrToData, &errorInfo.errMsg) );
ReleaseDataPacket(&dataPacket);
// get another data packet if any
errChk ( GetDataPacket(sinkVChan, &dataPacket, &errorInfo.errMsg) );
// assemble waveform from multiple packets until a NULL packet is encountered
while (dataPacket) {
// get waveform data from the first non-NULL data packet
dataPacketPtrToData = GetDataPacketPtrToData(dataPacket, &dataPacketType);
// check if retrieved data packet is of the same type as the first packet
if (firstDataPacketType != dataPacketType) {
nullChk( msgBuff = StrDup("Data packets must be all of the same type") );
SET_ERR(ReceiveWaveform_Err_NotSameDataType, msgBuff);
}
errChk( AppendWaveform(*waveform, *(Waveform_type**)dataPacketPtrToData, &errorInfo.errMsg) );
ReleaseDataPacket(&dataPacket);
// get another packet
errChk ( GetDataPacket(sinkVChan, &dataPacket, &errorInfo.errMsg) );
}
// check again if waveform is NULL
if (!*waveform) {
nullChk( msgBuff = StrDup("Waveform received does not contain any data. This occurs if a NULL packet is encountered before any data packets or the data packet doesn't have any data") );
SET_ERR(ReceiveWaveform_Err_NoWaveform, msgBuff);
}
// assign waveform type
if (waveformType)
switch (dataPacketType) {
case DL_Waveform_Char:
*waveformType = Waveform_Char;
break;
case DL_Waveform_UChar:
*waveformType = Waveform_UChar;
break;
case DL_Waveform_Short:
*waveformType = Waveform_Short;
break;
case DL_Waveform_UShort:
*waveformType = Waveform_UShort;
break;
case DL_Waveform_Int:
*waveformType = Waveform_Int;
break;
case DL_Waveform_UInt:
*waveformType = Waveform_UInt;
break;
case DL_Waveform_Int64:
*waveformType = Waveform_Int64;
break;
case DL_Waveform_UInt64:
*waveformType = Waveform_UInt64;
break;
case DL_Waveform_SSize:
*waveformType = Waveform_SSize;
break;
case DL_Waveform_Size:
*waveformType = Waveform_Size;
break;
case DL_Waveform_Float:
*waveformType = Waveform_Float;
break;
case DL_Waveform_Double:
*waveformType = Waveform_Double;
break;
default:
nullChk( msgBuff = StrDup(" Data packet received is not of a waveform type and cannot be retrieved by this function") );
SET_ERR(ReceiveWaveform_Err_WrongDataType, msgBuff);
}
return 0;
Error:
// cleanup
OKfree(msgBuff);
ReleaseDataPacket(&dataPacket);
discard_Waveform_type(waveform);
RETURN_ERR
}
