bitaudio.c

/*
	gcc -s -O3 -Wall -o bitaudio bitaudio.c -lportaudio
*/
#include <portaudio.h>
#include <signal.h>
#include <stdlib.h>
#include <stdio.h>
#include <fcntl.h>

static PaStream *stream;

static int pa_callback(const void *in, void *out,
	unsigned long framesPerBuffer,
	const PaStreamCallbackTimeInfo *timeInfo,
	PaStreamCallbackFlags statusFlags,
	void *userData)
{
	fread(out, 1, framesPerBuffer, stdin);
	return paContinue;
}

static void sigint(int signo)
{
	Pa_StopStream(stream);
	Pa_CloseStream(stream);
	Pa_Terminate();
	exit(0);
}

int main(int argc, char **argv)
{
	PaStreamParameters outputParameters;
	Pa_Initialize();
	_setmode(_fileno(stdin), _O_BINARY);
	outputParameters.device = Pa_GetDefaultOutputDevice();
	outputParameters.channelCount = 1;
	outputParameters.sampleFormat = paUInt8;
	outputParameters.suggestedLatency = Pa_GetDeviceInfo(outputParameters.device)->defaultLowOutputLatency;
	outputParameters.hostApiSpecificStreamInfo = NULL;
	Pa_OpenStream(&stream, NULL, &outputParameters,	8000, 256, 0, pa_callback, NULL);
	Pa_StartStream(stream);
	signal(SIGINT, sigint);
	for(;;) {
		Pa_Sleep(1000);
	}
	return 0;
}

foo.c

/*
	gcc -s -Wall -O3 -o foo foo.c && foo | bitaudio
*/
#include <stdio.h>

static char blipblop(unsigned int t)
{
	return t * ((t>>9|t>>13)&25&t>>6);
}

int main(int argc, char **argv)
{
	unsigned int t;
	for(t = 0;;t++) {
		fputc(blipblop(t), stdout);
	}
	return 0;
}