patest_latency.c File Reference
Hear the latency caused by big buffers. Play a sine wave and change frequency based on letter input.
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#include <stdio.h>
#include <math.h>
#include "portaudio.h"
Detailed Description
Hear the latency caused by big buffers. Play a sine wave and change frequency based on letter input.
- Author:
- Phil Burk <philburk@softsynth.com>, and Darren Gibbs
Define Documentation
#define CalcPhaseIncrement |
( |
freq |
|
) |
((freq)/SAMPLE_RATE) |
#define FRAMES_PER_BUFFER (64) |
#define MIN_FREQ (100.0f) |
#define OUTPUT_DEVICE (Pa_GetDefaultOutputDevice()) |
#define SAMPLE_RATE (44100) |
Function Documentation
float LookupSine |
( |
paTestData * |
data, |
|
|
float |
phase | |
|
) |
| | |
References CalcPhaseIncrement, PaStreamParameters::channelCount, PaDeviceInfo::defaultLowOutputLatency, PaStreamParameters::device, FRAMES_PER_BUFFER, PaStreamParameters::hostApiSpecificStreamInfo, paTestData::left_phase, M_PI, MIN_FREQ, OUTPUT_DEVICE, Pa_GetDeviceInfo(), Pa_GetErrorText(), Pa_Initialize(), Pa_OpenStream(), Pa_StartStream(), Pa_StopStream(), Pa_Terminate(), paClipOff, paDitherOff, paFloat32, paNoError, paTestData::phase_increment, paTestData::right_phase, SAMPLE_RATE, PaStreamParameters::sampleFormat, paTestData::sine, PaStreamParameters::suggestedLatency, and TABLE_SIZE.