/* This routine will be called by the PortAudio engine when audio is needed.
** It may called at interrupt level on some machines so don't do anything
** that could mess up the system like calling malloc() or free().
*/
static int patestCallback( void *inputBuffer, void *outputBuffer,
unsigned long framesPerBuffer,
PaTimestamp outTime, void *userData )
{
paTestData *data = (paTestData*)userData;
float *out = (float*)outputBuffer;
unsigned long i;
int finished = 0;
(void) outTime; /* Prevent unused variable warnings. */
(void) inputBuffer;
for( i=0; i<framesPerBuffer; i++ )
{
*out++ = LookupSine(data, data->left_phase); /* left */
*out++ = LookupSine(data, data->right_phase); /* right */
data->left_phase += data->phase_increment;
if( data->left_phase >= 1.0f ) data->left_phase -= 1.0f;
data->right_phase += (data->phase_increment * 1.5f); /* fifth above */
if( data->right_phase >= 1.0f ) data->right_phase -= 1.0f;
/* sweep frequency then start over. */
data->phase_increment *= FREQ_SCALAR;
if( data->phase_increment > CalcPhaseIncrement(MAX_FREQ) ) data->phase_increment = CalcPhaseIncrement(MIN_FREQ);
}
return 0;
}
/* This routine will be called by the PortAudio engine when audio is needed.
** It may called at interrupt level on some machines so don't do anything
** that could mess up the system like calling malloc() or free().
*/
static int patestCallback( void *inputBuffer, void *outputBuffer,
unsigned long framesPerBuffer,
PaTimestamp outTime, void *userData )
{
paTestData *data = (paTestData*)userData;
float *out = (float*)outputBuffer;
int framesToCalc;
int i;
int finished = 0;
(void) outTime; /* Prevent unused variable warnings. */
(void) inputBuffer;
if( data->framesToGo < framesPerBuffer )
{
framesToCalc = data->framesToGo;
data->framesToGo = 0;
finished = 1;
}
else
{
framesToCalc = framesPerBuffer;
data->framesToGo -= framesPerBuffer;
}
for( i=0; i<framesToCalc; i++ )
{
*out++ = LookupSine(data, data->left_phase); /* left */
*out++ = LookupSine(data, data->right_phase); /* right */
data->left_phase += data->phase_increment;
if( data->left_phase >= 1.0f ) data->left_phase -= 1.0f;
data->right_phase += (data->phase_increment * 1.5f); /* fifth above */
if( data->right_phase >= 1.0f ) data->right_phase -= 1.0f;
/* sweep frequency then start over. */
data->phase_increment *= FREQ_SCALAR;
if( data->phase_increment > CalcPhaseIncrement(MAX_FREQ) ) data->phase_increment = CalcPhaseIncrement(MIN_FREQ);
}
/* zero remainder of final buffer */
for( ; i<(int)framesPerBuffer; i++ )
{
*out++ = 0; /* left */
*out++ = 0; /* right */
}
// Pa_Sleep( 3 * MSEC_PER_BUFFER / 4 );
// Pa_Sleep( MSEC_PER_BUFFER / 3 );
return finished;
}
/* This routine will be called by the PortAudio engine when audio is needed.
** It may called at interrupt level on some machines so don't do anything
** that could mess up the system like calling malloc() or free().
*/
static int patestCallback( const void *inputBuffer, void *outputBuffer,
unsigned long framesPerBuffer,
const PaStreamCallbackTimeInfo* timeInfo,
PaStreamCallbackFlags statusFlags,
void *userData )
{
paTestData *data = (paTestData*)userData;
float *out = (float*)outputBuffer;
int i;
(void) inputBuffer; /* Prevent unused variable warning. */
for( i=0; i<framesPerBuffer; i++ )
{
*out++ = LookupSine(data, data->left_phase); /* left */
*out++ = LookupSine(data, data->right_phase); /* right */
data->left_phase += data->phase_increment;
if( data->left_phase >= 1.0f ) data->left_phase -= 1.0f;
data->right_phase += (data->phase_increment * 1.5f); /* fifth above */
if( data->right_phase >= 1.0f ) data->right_phase -= 1.0f;
}
return 0;
}
/* This routine will be called by the PortAudio engine when audio is needed.
** It may called at interrupt level on some machines so don't do anything
** that could mess up the system like calling malloc() or free().
*/
static int patestCallback(const void* inputBuffer,
void* outputBuffer,
unsigned long framesPerBuffer,
const PaStreamCallbackTimeInfo* timeInfo,
PaStreamCallbackFlags statusFlags,
void* userData )
{
paTestData *data = (paTestData*)userData;
float *out = (float*)outputBuffer;
float outSample;
float scaler;
int numForScale;
unsigned long i;
int j;
int finished = 0;
(void) inputBuffer; /* Prevent unused argument warning. */
/* Determine amplitude scaling factor */
numForScale = data->numSines;
if( numForScale < 8 ) numForScale = 8; /* prevent pops at beginning */
scaler = 1.0f / numForScale;
for( i=0; i<framesPerBuffer; i++ )
{
float output = 0.0;
float phaseInc = MIN_PHASE_INC;
float phase;
for( j=0; j<data->numSines; j++ )
{
/* Advance phase of next oscillator. */
phase = data->phases[j];
phase += phaseInc;
if( phase >= 1.0 ) phase -= 1.0;
output += LookupSine(data, phase);
data->phases[j] = phase;
phaseInc *= 1.02f;
if( phaseInc > MAX_PHASE_INC ) phaseInc = MIN_PHASE_INC;
}
outSample = (float) (output * scaler);
*out++ = outSample; /* Left */
*out++ = outSample; /* Right */
}
return finished;
}
