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Add test for sample format conversion.

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This commit is contained in:
philburk 2011-03-02 01:53:02 +00:00
commit 0ebc551e6e
5 changed files with 275 additions and 31 deletions
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93
qa/loopback/src/paqa_tools.c
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@ -38,6 +38,7 @@
#include "paqa_tools.h"
/*******************************************************************/
void PaQa_ListAudioDevices(void)
{
@ -54,3 +55,95 @@ void PaQa_ListAudioDevices(void)
printf( ", on %s\n", Pa_GetHostApiInfo( deviceInfo->hostApi )->name );
}
}
/*******************************************************************/
void PaQa_ConvertToFloat( const void *input, int numSamples, PaSampleFormat inFormat, float *output )
{
int i;
switch( inFormat )
{
case paUInt8:
{
unsigned char *data = (unsigned char *)input;
for( i=0; i<numSamples; i++ )
{
int value = *data++;
value -= 128;
*output++ = value / 128.0f;
}
}
break;
case paInt16:
{
short *data = (short *)input;
for( i=0; i<numSamples; i++ )
{
*output++ = *data++ / 32768.0f;
}
}
break;
case paInt32:
{
int *data = (int *)input;
for( i=0; i<numSamples; i++ )
{
int value = *data++;
value = value >> 8;
float fval = (float) (value / ((double) 0x00800000));
*output++ = fval;
}
}
break;
}
}
/*******************************************************************/
void PaQa_ConvertFromFloat( const float *input, int numSamples, PaSampleFormat outFormat, void *output )
{
int i;
switch( outFormat )
{
case paUInt8:
{
unsigned char *data = (unsigned char *)output;
for( i=0; i<numSamples; i++ )
{
float value = *input++;
int byte = ((int) (value * 127)) + 128;
*data++ = (unsigned char) byte;
}
}
break;
case paInt16:
{
short *data = (short *)output;
for( i=0; i<numSamples; i++ )
{
float value = *input++;
// Use assymmetric conversion to avoid clipping.
short sval = value * 32767.0;
*data++ = sval;
}
}
break;
case paInt32:
{
int *data = (int *)output;
for( i=0; i<numSamples; i++ )
{
float value = *input++;
// Use assymmetric conversion to avoid clipping.
int ival = value * ((double) 0x007FFFF0);
ival = ival << 8;
*data++ = ival;
}
}
break;
}
}