patest_maxsines.c File Reference

How many sine waves can we calculate and play in less than 80% CPU Load. More...

#include <stdio.h>
#include <math.h>
#include "portaudio.h"

Data Structures
struct	paTestData

Macros
#define	MAX_SINES   (2000)
#define	MAX_USAGE   (0.5)
#define	SAMPLE_RATE   (44100)
#define	FREQ_TO_PHASE_INC(freq)
#define	MIN_PHASE_INC   FREQ_TO_PHASE_INC(200.0f)
#define	MAX_PHASE_INC   (MIN_PHASE_INC * (1 << 5))
#define	FRAMES_PER_BUFFER   (512)
#define	M_PI   (3.14159265)
#define	TWOPI   (M_PI * 2.0)
#define	TABLE_SIZE   (1024)

Typedefs
typedef struct paTestData	paTestData

Functions
float	LookupSine (paTestData *data, float phase)
int	main (void)

Detailed Description

How many sine waves can we calculate and play in less than 80% CPU Load.

Author

Ross Bencina rossb.nosp@m.@aud.nosp@m.iomul.nosp@m.ch.c.nosp@m.om

Phil Burk philb.nosp@m.urk@.nosp@m.softs.nosp@m.ynth.nosp@m..com

Macro Definition Documentation

FRAMES_PER_BUFFER

#define FRAMES_PER_BUFFER   (512)

Referenced by main().

FREQ_TO_PHASE_INC

#define FREQ_TO_PHASE_INC

(

freq

)

Value:

(freq/(float)SAMPLE_RATE)

M_PI

#define M_PI   (3.14159265)

Referenced by main().

MAX_PHASE_INC

#define MAX_PHASE_INC   (MIN_PHASE_INC * (1 << 5))

MAX_SINES

#define MAX_SINES   (2000)

Referenced by main().

MAX_USAGE

#define MAX_USAGE   (0.5)

Referenced by main().

MIN_PHASE_INC

#define MIN_PHASE_INC   FREQ_TO_PHASE_INC(200.0f)

SAMPLE_RATE

#define SAMPLE_RATE   (44100)

Referenced by main().

TABLE_SIZE

#define TABLE_SIZE   (1024)

Referenced by LookupSine(), and main().

TWOPI

#define TWOPI   (M_PI * 2.0)

Typedef Documentation

paTestData

typedef struct paTestData paTestData

Function Documentation

LookupSine()

float LookupSine	(	paTestData *	data,
		float	phase )

References paTestData::sine, and TABLE_SIZE.

main()

int main

(

void

)

References PaStreamParameters::channelCount, PaDeviceInfo::defaultHighOutputLatency, PaStreamParameters::device, FRAMES_PER_BUFFER, PaStreamParameters::hostApiSpecificStreamInfo, M_PI, MAX_SINES, MAX_USAGE, paTestData::numSines, Pa_CloseStream(), Pa_GetDefaultOutputDevice(), Pa_GetDeviceInfo(), Pa_GetErrorText(), Pa_GetStreamCpuLoad(), Pa_Initialize(), Pa_OpenStream(), Pa_Sleep(), Pa_StartStream(), Pa_StopStream(), Pa_Terminate(), paClipOff, paFloat32, paNoDevice, paNoError, SAMPLE_RATE, PaStreamParameters::sampleFormat, paTestData::sine, PaStreamParameters::suggestedLatency, and TABLE_SIZE.