int main(void)
{
PaError err;
paTestData DATA;
int i;
float amplitude = 32.0 / (1<<15);
printf("PortAudio Test: output EXTREMELY QUIET sine wave with and without dithering.\n");
/* initialise sinusoidal wavetable */
for( i=0; i<TABLE_SIZE; i++ )
{
DATA.sine[i] = (float) sin( ((double)i/(double)TABLE_SIZE) * M_PI * 2. );
}
printf("\nNo treatment..\n"); fflush(stdout);
err = PlaySine( &DATA, paClipOff | paDitherOff, amplitude );
if( err < 0 ) goto error;
printf("\nClip.\n");
fflush(stdout);
err = PlaySine( &DATA, paDitherOff, amplitude );
if( err < 0 ) goto error;
printf("\nClip and Dither.\n");
fflush(stdout);
err = PlaySine( &DATA, paNoFlag, amplitude );
if( err < 0 ) goto error;
return 0;
error:
fprintf( stderr, "An error occured while using the portaudio stream\n" );
fprintf( stderr, "Error number: %d\n", err );
fprintf( stderr, "Error message: %s\n", Pa_GetErrorText( err ) );
return -1;
}
int main(void)
{
PaError err;
paTestData data;
int i;
printf("PortAudio Test: output sine wave with and without clipping.\n");
/* initialise sinusoidal wavetable */
for( i=0; i<TABLE_SIZE; i++ )
{
data.sine[i] = (float) sin( ((double)i/(double)TABLE_SIZE) * M_PI * 2. );
}
printf("\nHalf amplitude. Should sound like sine wave.\n"); fflush(stdout);
err = PlaySine( &data, paClipOff | paDitherOff, 0.5f );
if( err < 0 ) goto error;
printf("\nFull amplitude. Should sound like sine wave.\n"); fflush(stdout);
err = PlaySine( &data, paClipOff | paDitherOff, 0.999f );
if( err < 0 ) goto error;
printf("\nOver range with clipping and dithering turned OFF. Should sound very nasty.\n");
fflush(stdout);
err = PlaySine( &data, paClipOff | paDitherOff, 1.1f );
if( err < 0 ) goto error;
printf("\nOver range with clipping and dithering turned ON. Should sound smoother than previous.\n");
fflush(stdout);
err = PlaySine( &data, paNoFlag, 1.1f );
if( err < 0 ) goto error;
printf("\nOver range with paClipOff but dithering ON.\n"
"That forces clipping ON so it should sound the same as previous.\n");
fflush(stdout);
err = PlaySine( &data, paClipOff, 1.1f );
if( err < 0 ) goto error;
return 0;
error:
fprintf( stderr, "An error occured while using the portaudio stream\n" );
fprintf( stderr, "Error number: %d\n", err );
fprintf( stderr, "Error message: %s\n", Pa_GetErrorText( err ) );
return 1;
}
int main(void)
{
PaError err;
paTestData DATA;
int i;
float amplitude = 4.0 / (1<<15);
printf("PortAudio Test: output EXTREMELY QUIET sine wave with and without dithering.\n");
/* initialise sinusoidal wavetable */
for( i=0; i<TABLE_SIZE; i++ )
{
DATA.sine[i] = (float) sin( ((double)i/(double)TABLE_SIZE) * M_PI * 2. );
}
printf("\nNo treatment..\n"); fflush(stdout);
err = PlaySine( &DATA, paClipOff | paDitherOff, amplitude );
if( err < 0 ) goto done;
printf("\nClip..\n");
fflush(stdout);
err = PlaySine( &DATA, paDitherOff, amplitude );
if( err < 0 ) goto done;
printf("\nClip and Dither..\n");
fflush(stdout);
err = PlaySine( &DATA, paNoFlag, amplitude );
done:
if (err)
{
fprintf( stderr, "An error occured while using the portaudio stream\n" );
fprintf( stderr, "Error number: %d\n", err );
fprintf( stderr, "Error message: %s\n", Pa_GetErrorText( err ) );
err = 1; /* Though PlaySine() already called Pa_Terminate(), */
} /* we may still call Pa_GetErrorText(). */
else
printf("\n(Don't forget to turn the VOLUME DOWN after listening so carefully.)\n");
return err; /* 0 or 1. */
}
