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#include <iostream>
#include <cmath>
 
#include <GL/glut.h>
#include <GL/glu.h>
#include <unistd.h>
#include <fcntl.h>
#include <stropts.h>
#include </usr/lib/oss/include/sys/soundcard.h>
 
void display(void);
void keyboard(unsigned char, int, int);
void mouse(int, int, int, int);
void changeSize(int, int);
 
using namespace std;
 
int win;
int fd;
 
int main(int argc, char **argv)
{
	fd = open("/dev/dsp", O_RDWR | O_EXCL);
 
	if(fd == -1)
	{
		std::cout << "failed to open audio device.\n";
	}
 
	int frag = (2 << 16) | (7); // 2 X 128 byte fragment buffer 
	if(ioctl(fd, SNDCTL_DSP_SETFRAGMENT, &frag) == -1)
	{
		std::cout << "failed to set fragment_size.\n";
	}
 
	int format = AFMT_S16_LE;
	if(ioctl(fd, SNDCTL_DSP_SETFMT, &format) == -1)
	{
		std::cout << "failed to set sample format.\n";
	}
 
	int rate = 44100;
	if(ioctl(fd, SNDCTL_DSP_SPEED, &rate) == -1)
	{
		std::cout << "failed to set sample rate.\n";
	}
 
	int channels = 1;
	if(ioctl(fd, SNDCTL_DSP_CHANNELS, &channels) == -1)
	{
		std::cout << "failed to set to mono.\n";
	}
 
	glutInit(&argc, argv);
	glutInitDisplayMode(GLUT_DEPTH | GLUT_RGBA | GLUT_DOUBLE);
	glutInitWindowSize(1024,768);
	win = glutCreateWindow("Oscilloscope");
	glutDisplayFunc(display);
	glutIdleFunc(display);
	glutKeyboardFunc(keyboard);
	glutMouseFunc(mouse);
	glutReshapeFunc(changeSize);
	glClearColor(0.0,0.0,0.0,0.0);
 
	glutMainLoop();
 
	return 0;
}
 
//at 44100Hz 8ms of waveform will be displayed on the screen
#define SAMPLE_SIZE 704
signed short samples[SAMPLE_SIZE];
bool pos = true, neg = true;
void display(void)
{
	glClear(GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT);
	glEnable(GL_DEPTH_TEST);
 
	glLoadIdentity();
 
	read(fd, (char *)samples, sizeof(samples));
 
	bool trigger = false;
	bool been_neg = false;
	bool falling_edge = false;
	int x = 0;
	glBegin(GL_LINE_STRIP);
	for(int i = 0; i < sizeof(samples) / sizeof(signed short); i++)
	{
		if(samples[i] < 1000 && pos == true)
		{
			neg = true;
			pos = false;
		}
 
		if(samples[i] > 1000 && neg == true)
		{
			neg = false;
			pos = true;
		}
 
		if(neg)
		{
			been_neg = true;
		}
 
		if(pos && been_neg)
		{
			trigger = true;
		}
 
		if(trigger && neg && !falling_edge)
		{
			falling_edge = true;
			std::cout << "Falling Edge: " << (1.0 / 44100 * x) << "\n";
		}
 
		if(trigger)
		{
			glVertex3f(x / (SAMPLE_SIZE * 1.0), samples[i] / pow(2,15), 0.0);
			x++;
		}
	}
	glEnd();
 
	glutSwapBuffers();
	glutPostRedisplay();
}
 
void keyboard(unsigned char key, int x, int y)
{
	if(key == 'x')
	{
		glutDestroyWindow(win);
		exit(0);
	}
}
 
void mouse(int button, int state, int x, int y)
{
	std::cout << "Time: " << (x / 1024.0) * (1.0 / 44100 * SAMPLE_SIZE) << "\n";
}
 
void changeSize(int w, int h)
{
	if (h == 0)
		h = 1;
 
	float ratio =  w * 1.0 / h;
 
	// Use the Projection Matrix
	glMatrixMode(GL_PROJECTION);
 
	// Reset Matrix
	glLoadIdentity();
 
	// Set the viewport to be the entire window
	glViewport(0, 0, w, h);
 
	// Set the correct perspective.
	//gluPerspective(45.0f, ratio, 0.1f, 100.0f);
	glOrtho(0.0, 1.0, -1.0, 1.0, 1.0, -1.0);
 
	// Get Back to the Modelview
	glMatrixMode(GL_MODELVIEW);
}

prog.cpp:4:21: error: GL/glut.h: No such file or directory
prog.cpp:5:20: error: GL/glu.h: No such file or directory
prog.cpp:9:48: error: /usr/lib/oss/include/sys/soundcard.h: No such file or directory
prog.cpp: In function ‘int main(int, char**)’:
prog.cpp:31: error: ‘SNDCTL_DSP_SETFRAGMENT’ was not declared in this scope
prog.cpp:36: error: ‘AFMT_S16_LE’ was not declared in this scope
prog.cpp:37: error: ‘SNDCTL_DSP_SETFMT’ was not declared in this scope
prog.cpp:43: error: ‘SNDCTL_DSP_SPEED’ was not declared in this scope
prog.cpp:49: error: ‘SNDCTL_DSP_CHANNELS’ was not declared in this scope
prog.cpp:54: error: ‘glutInit’ was not declared in this scope
prog.cpp:55: error: ‘GLUT_DEPTH’ was not declared in this scope
prog.cpp:55: error: ‘GLUT_RGBA’ was not declared in this scope
prog.cpp:55: error: ‘GLUT_DOUBLE’ was not declared in this scope
prog.cpp:55: error: ‘glutInitDisplayMode’ was not declared in this scope
prog.cpp:56: error: ‘glutInitWindowSize’ was not declared in this scope
prog.cpp:57: error: ‘glutCreateWindow’ was not declared in this scope
prog.cpp:58: error: ‘glutDisplayFunc’ was not declared in this scope
prog.cpp:59: error: ‘glutIdleFunc’ was not declared in this scope
prog.cpp:60: error: ‘glutKeyboardFunc’ was not declared in this scope
prog.cpp:61: error: ‘glutMouseFunc’ was not declared in this scope
prog.cpp:62: error: ‘glutReshapeFunc’ was not declared in this scope
prog.cpp:63: error: ‘glClearColor’ was not declared in this scope
prog.cpp:65: error: ‘glutMainLoop’ was not declared in this scope
prog.cpp: In function ‘void display()’:
prog.cpp:76: error: ‘GL_COLOR_BUFFER_BIT’ was not declared in this scope
prog.cpp:76: error: ‘GL_DEPTH_BUFFER_BIT’ was not declared in this scope
prog.cpp:76: error: ‘glClear’ was not declared in this scope
prog.cpp:77: error: ‘GL_DEPTH_TEST’ was not declared in this scope
prog.cpp:77: error: ‘glEnable’ was not declared in this scope
prog.cpp:79: error: ‘glLoadIdentity’ was not declared in this scope
prog.cpp:87: error: ‘GL_LINE_STRIP’ was not declared in this scope
prog.cpp:87: error: ‘glBegin’ was not declared in this scope
prog.cpp:88: warning: comparison between signed and unsigned integer expressions
prog.cpp:120: error: ‘glVertex3f’ was not declared in this scope
prog.cpp:124: error: ‘glEnd’ was not declared in this scope
prog.cpp:126: error: ‘glutSwapBuffers’ was not declared in this scope
prog.cpp:127: error: ‘glutPostRedisplay’ was not declared in this scope
prog.cpp:81: warning: ignoring return value of ‘ssize_t read(int, void*, size_t)’, declared with attribute warn_unused_result
prog.cpp: In function ‘void keyboard(unsigned char, int, int)’:
prog.cpp:134: error: ‘glutDestroyWindow’ was not declared in this scope
prog.cpp:135: error: ‘exit’ was not declared in this scope
prog.cpp: In function ‘void changeSize(int, int)’:
prog.cpp:152: error: ‘GL_PROJECTION’ was not declared in this scope
prog.cpp:152: error: ‘glMatrixMode’ was not declared in this scope
prog.cpp:155: error: ‘glLoadIdentity’ was not declared in this scope
prog.cpp:158: error: ‘glViewport’ was not declared in this scope
prog.cpp:162: error: ‘glOrtho’ was not declared in this scope
prog.cpp:165: error: ‘GL_MODELVIEW’ was not declared in this scope
prog.cpp:149: warning: unused variable ‘ratio’

Standard output is empty