patest_suggested_vs_streaminfo_latency.c File Reference

Print suggested vs. PaStreamInfo reported actual latency. More...

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

Macros
#define	SAMPLE_RATE   (44100)
#define	FRAMES_PER_BUFFER   2
#define	NUM_CHANNELS   (2)
#define	SUGGESTED_LATENCY_START_SECONDS   (0.0)
#define	SUGGESTED_LATENCY_END_SECONDS   (2.0)
#define	SUGGESTED_LATENCY_INCREMENT_SECONDS   (0.0005) /* half a millisecond increments */

Functions
int	main (int argc, const char *argv[])

Detailed Description

Print suggested vs. PaStreamInfo reported actual latency.

Author

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

Opens streams with a sequence of suggested latency values from 0 to 2 seconds in .5ms intervals and gathers the resulting actual latency values. Output a csv file and graph suggested vs. actual. Run with framesPerBuffer unspecified, powers of 2 and multiples of 50 and prime number buffer sizes.

Macro Definition Documentation

#define FRAMES_PER_BUFFER   2

Referenced by main().

#define NUM_CHANNELS   (2)

Referenced by main().

#define SAMPLE_RATE   (44100)

Referenced by main().

#define SUGGESTED_LATENCY_END_SECONDS   (2.0)

Referenced by main().

#define SUGGESTED_LATENCY_INCREMENT_SECONDS   (0.0005) /* half a millisecond increments */

Referenced by main().

#define SUGGESTED_LATENCY_START_SECONDS   (0.0)

Referenced by main().

Function Documentation

int main	(	int	argc,
		const char *	argv[]
	)

References PaStreamParameters::channelCount, PaStreamParameters::device, FRAMES_PER_BUFFER, PaDeviceInfo::hostApi, PaStreamParameters::hostApiSpecificStreamInfo, PaStreamInfo::inputLatency, PaDeviceInfo::maxInputChannels, PaDeviceInfo::maxOutputChannels, PaHostApiInfo::name, PaDeviceInfo::name, NUM_CHANNELS, PaStreamInfo::outputLatency, Pa_CloseStream(), Pa_GetDefaultInputDevice(), Pa_GetDefaultOutputDevice(), Pa_GetDeviceInfo(), Pa_GetErrorText(), Pa_GetHostApiInfo(), Pa_GetStreamInfo(), Pa_Initialize(), Pa_OpenStream(), Pa_Terminate(), paClipOff, paFloat32, paNoDevice, paNoError, SAMPLE_RATE, PaStreamParameters::sampleFormat, SUGGESTED_LATENCY_END_SECONDS, SUGGESTED_LATENCY_INCREMENT_SECONDS, SUGGESTED_LATENCY_START_SECONDS, PaStreamParameters::suggestedLatency, and usage().