patest_stop.c File Reference

Test different ways of stopping audio. More...

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

Data Structures
struct	paTestData

Macros
#define	OUTPUT_DEVICE   (Pa_GetDefaultOutputDevice())
#define	SLEEP_DUR   (200)
#define	SAMPLE_RATE   (44100)
#define	FRAMES_PER_BUFFER   (256)
#define	LATENCY_SECONDS   (3.f)
#define	FRAMES_PER_NOTE   (SAMPLE_RATE/2)
#define	MAX_REPEATS   (2)
#define	FUNDAMENTAL   (400.0f / SAMPLE_RATE)
#define	NOTE_0   (FUNDAMENTAL * 1.0f / 1.0f)
#define	NOTE_1   (FUNDAMENTAL * 5.0f / 4.0f)
#define	NOTE_2   (FUNDAMENTAL * 4.0f / 3.0f)
#define	NOTE_3   (FUNDAMENTAL * 3.0f / 2.0f)
#define	NOTE_4   (FUNDAMENTAL * 2.0f / 1.0f)
#define	MODE_FINISH   (0)
#define	MODE_STOP   (1)
#define	MODE_ABORT   (2)
#define	M_PI   (3.14159265)
#define	TABLE_SIZE   (400)

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

Detailed Description

Test different ways of stopping audio.

Test the three ways of stopping audio:

• calling Pa_StopStream(),
• calling Pa_AbortStream(),
• and returning a 1 from the callback function.

A long latency is set up so that you can hear the difference. Then a simple 8 note sequence is repeated twice. The program will print what you should hear.

Author

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

Macro Definition Documentation

#define FRAMES_PER_BUFFER   (256)

Referenced by TestStopMode().

#define FRAMES_PER_NOTE   (SAMPLE_RATE/2)

#define FUNDAMENTAL   (400.0f / SAMPLE_RATE)

#define LATENCY_SECONDS   (3.f)

Referenced by TestStopMode().

#define M_PI   (3.14159265)

#define MAX_REPEATS   (2)

Referenced by TestStopMode().

#define MODE_ABORT   (2)

Referenced by TestStopMode().

#define MODE_FINISH   (0)

Referenced by TestStopMode().

#define MODE_STOP   (1)

#define NOTE_0   (FUNDAMENTAL * 1.0f / 1.0f)

#define NOTE_1   (FUNDAMENTAL * 5.0f / 4.0f)

#define NOTE_2   (FUNDAMENTAL * 4.0f / 3.0f)

#define NOTE_3   (FUNDAMENTAL * 3.0f / 2.0f)

#define NOTE_4   (FUNDAMENTAL * 2.0f / 1.0f)

#define OUTPUT_DEVICE   (Pa_GetDefaultOutputDevice())

Referenced by TestStopMode().

#define SAMPLE_RATE   (44100)

Referenced by TestStopMode().

#define SLEEP_DUR   (200)

Referenced by TestStopMode().

#define TABLE_SIZE   (400)

Referenced by LookupWaveform().

Function Documentation

float LookupWaveform	(	paTestData *	data,
		float	phase
	)

References TABLE_SIZE, and paTestData::waveform.

int main

(

void

)

int TestStopMode

(

paTestData *

data

)

References PaStreamParameters::channelCount, PaStreamParameters::device, paTestData::done, paTestData::frameCounter, FRAMES_PER_BUFFER, PaStreamParameters::hostApiSpecificStreamInfo, LATENCY_SECONDS, MAX_REPEATS, MODE_ABORT, MODE_FINISH, paTestData::noteCounter, OUTPUT_DEVICE, Pa_AbortStream(), Pa_CloseStream(), Pa_GetErrorText(), Pa_Initialize(), Pa_IsStreamActive(), Pa_OpenStream(), Pa_Sleep(), Pa_StartStream(), Pa_StopStream(), Pa_Terminate(), paClipOff, paFloat32, paNoDevice, paNoError, paTestData::phase, paTestData::phase_increment, paTestData::repeatCounter, SAMPLE_RATE, PaStreamParameters::sampleFormat, SLEEP_DUR, paTestData::stopMode, PaStreamParameters::suggestedLatency, and paTestData::tune.