void mono_handler(const lcm_recv_buf_t *rbuf, const char* channel, const lcmt_stereo *msg, void *user) {
// open the frame of the video specified by the message
// check to see if the current video is the correct video file
if (current_video_number != msg->video_number) {
video_capture.release();
std::string newfile = GetMonoFilename(msg->timestamp, msg->video_number);
if (newfile.empty()) {
return;
}
std::cout << "Opening file: " << newfile << std::endl;
if (!video_capture.open(newfile)) {
std::cerr << "Failed to open file: " << newfile << std::endl;
return;
}
current_video_number = msg->video_number;
}
video_capture.set(CV_CAP_PROP_POS_FRAMES, msg->frame_number + frame_offset);
cv::Mat frame;
video_capture >> frame;
SendImageOverLcm(lcm_, image_channel, frame);
}
int main(int argc, char *argv[])
{
// get input arguments
string configFile = "";
string video_file_left = "", video_file_right = "", video_directory = "";
int starting_frame_number = 0;
bool enable_gamma = false;
float random_results = -1.0;
int last_frame_number = -1;
int last_playback_frame_number = -2;
ConciseArgs parser(argc, argv);
parser.add(configFile, "c", "config", "Configuration file containing camera GUIDs, etc.", true);
parser.add(show_display, "d", "show-dispaly", "Enable for visual debugging display. Will reduce framerate significantly.");
parser.add(show_display_wait, "w", "show-display-wait", "Optional argument to decrease framerate for lower network traffic when forwarding the display.");
parser.add(show_unrectified, "u", "show-unrectified", "When displaying images, do not apply rectification.");
parser.add(disable_stereo, "s", "disable-stereo", "Disable online stereo processing.");
parser.add(force_brightness, "b", "force-brightness", "Force a brightness setting.");
parser.add(force_exposure, "e", "force-exposure", "Force an exposure setting.");
parser.add(quiet_mode, "q", "quiet", "Reduce text output.");
parser.add(video_file_left, "l", "video-file-left", "Do not use cameras, instead use this video file (also requires a right video file).");
parser.add(video_file_right, "t", "video-file-right", "Right video file, only for use with the -l option.");
parser.add(video_directory, "i", "video-directory", "Directory to search for videos in (for playback).");
parser.add(starting_frame_number, "f", "starting-frame", "Frame to start at when playing back videos.");
parser.add(display_hud, "v", "hud", "Overlay HUD on display images.");
parser.add(record_hud, "x", "record-hud", "Record the HUD display.");
parser.add(file_frame_skip, "p", "skip", "Number of frames skipped in recording (for playback).");
parser.add(enable_gamma, "g", "enable-gamma", "Turn gamma on for both cameras.");
parser.add(random_results, "R", "random-results", "Number of random points to produce per frame. Can be a float in which case we'll take a random sample to decide if to produce the last one. Disables real stereo processing. Only for debugging / analysis!");
parser.add(publish_all_images, "P", "publish-all-images", "Publish all images to LCM");
parser.parse();
// parse the config file
if (ParseConfigFile(configFile, &stereoConfig) != true)
{
fprintf(stderr, "Failed to parse configuration file, quitting.\n");
return -1;
}
if (video_file_left.length() > 0
&& video_file_right.length() <= 0) {
fprintf(stderr, "Error: for playback you must specify both "
"a right and left video file. (Only got a left one.)\n");
return -1;
}
if (video_file_left.length() <= 0
&& video_file_right.length() > 0) {
fprintf(stderr, "Error: for playback you must specify both "
"a right and left video file. (Only got a right one.)\n");
return -1;
}
recording_manager.Init(stereoConfig);
// attempt to load video files / directories
if (video_file_left.length() > 0) {
if (recording_manager.LoadVideoFiles(video_file_left, video_file_right) != true) {
// don't have videos, bail out.
return -1;
}
}
if (video_directory.length() > 0) {
if (recording_manager.SetPlaybackVideoDirectory(video_directory) != true) {
// bail
return -1;
}
}
recording_manager.SetQuietMode(quiet_mode);
recording_manager.SetPlaybackFrameNumber(starting_frame_number);
uint64 guid = stereoConfig.guidLeft;
uint64 guid2 = stereoConfig.guidRight;
// start up LCM
lcm_t * lcm;
lcm = lcm_create (stereoConfig.lcmUrl.c_str());
unsigned long elapsed;
Hud hud;
// --- setup control-c handling ---
struct sigaction sigIntHandler;
sigIntHandler.sa_handler = control_c_handler;
sigemptyset(&sigIntHandler.sa_mask);
sigIntHandler.sa_flags = 0;
sigaction(SIGINT, &sigIntHandler, NULL);
// --- end ctrl-c handling code ---
dc1394error_t err;
dc1394error_t err2;
// tell opencv to use only one core so that we can manage our
// own threading without a fight
setNumThreads(1);
if (recording_manager.UsingLiveCameras()) {
d = dc1394_new ();
if (!d)
cerr << "Could not create dc1394 context" << endl;
d2 = dc1394_new ();
if (!d2)
cerr << "Could not create dc1394 context for camera 2" << endl;
camera = dc1394_camera_new (d, guid);
if (!camera)
{
cerr << "Could not create dc1394 camera... quitting." << endl;
exit(1);
}
camera2 = dc1394_camera_new (d2, guid2);
if (!camera2)
cerr << "Could not create dc1394 camera for camera 2" << endl;
// reset the bus
dc1394_reset_bus(camera);
dc1394_reset_bus(camera2);
// setup
err = setup_gray_capture(camera, DC1394_VIDEO_MODE_FORMAT7_1);
DC1394_ERR_CLN_RTN(err, cleanup_and_exit(camera), "Could not setup camera");
err2 = setup_gray_capture(camera2, DC1394_VIDEO_MODE_FORMAT7_1);
DC1394_ERR_CLN_RTN(err2, cleanup_and_exit(camera2), "Could not setup camera number 2");
// enable camera
err = dc1394_video_set_transmission(camera, DC1394_ON);
DC1394_ERR_CLN_RTN(err, cleanup_and_exit(camera), "Could not start camera iso transmission");
err2 = dc1394_video_set_transmission(camera2, DC1394_ON);
DC1394_ERR_CLN_RTN(err2, cleanup_and_exit(camera2), "Could not start camera iso transmission for camera number 2");
InitBrightnessSettings(camera, camera2, enable_gamma);
}
if (show_display) {
namedWindow("Input", CV_WINDOW_AUTOSIZE | CV_WINDOW_KEEPRATIO);
namedWindow("Input2", CV_WINDOW_AUTOSIZE | CV_WINDOW_KEEPRATIO);
namedWindow("Stereo", CV_WINDOW_AUTOSIZE | CV_WINDOW_KEEPRATIO);
namedWindow("Left Block", CV_WINDOW_AUTOSIZE | CV_WINDOW_KEEPRATIO);
namedWindow("Right Block", CV_WINDOW_AUTOSIZE | CV_WINDOW_KEEPRATIO);
namedWindow("Debug 1", CV_WINDOW_AUTOSIZE | CV_WINDOW_KEEPRATIO);
namedWindow("Debug 2", CV_WINDOW_AUTOSIZE | CV_WINDOW_KEEPRATIO);
setMouseCallback("Input", onMouse); // for drawing disparity lines
setMouseCallback("Stereo", onMouseStereo, &hud); // for drawing disparity lines
moveWindow("Input", stereoConfig.displayOffsetX + 100, stereoConfig.displayOffsetY + 100);
moveWindow("Stereo", stereoConfig.displayOffsetX + 100, stereoConfig.displayOffsetY + 370);
moveWindow("Input2", stereoConfig.displayOffsetX + 478, stereoConfig.displayOffsetY + 100);
moveWindow("Left Block", stereoConfig.displayOffsetX + 900, stereoConfig.displayOffsetY + 100);
moveWindow("Right Block", stereoConfig.displayOffsetX + 1400, stereoConfig.displayOffsetY + 100);
moveWindow("Debug 1", stereoConfig.displayOffsetX + 900, stereoConfig.displayOffsetY + 670);
moveWindow("Debug 2", stereoConfig.displayOffsetX + 1400, stereoConfig.displayOffsetY + 670);
} // show display
if (show_display || publish_all_images) {
// if a channel exists, subscribe to it
if (stereoConfig.stereo_replay_channel.length() > 0) {
stereo_replay_sub = lcmt_stereo_subscribe(lcm, stereoConfig.stereo_replay_channel.c_str(), &stereo_replay_handler, &hud);
}
if (stereoConfig.pose_channel.length() > 0) {
mav_pose_t_sub = mav_pose_t_subscribe(lcm, stereoConfig.pose_channel.c_str(), &mav_pose_t_handler, &hud);
}
if (stereoConfig.gps_channel.length() > 0) {
mav_gps_data_t_sub = mav_gps_data_t_subscribe(lcm, stereoConfig.gps_channel.c_str(), &mav_gps_data_t_handler, &hud);
}
if (stereoConfig.baro_airspeed_channel.length() > 0) {
baro_airspeed_sub = lcmt_baro_airspeed_subscribe(lcm, stereoConfig.baro_airspeed_channel.c_str(), &baro_airspeed_handler, &hud);
}
if (stereoConfig.servo_out_channel.length() > 0) {
servo_out_sub = lcmt_deltawing_u_subscribe(lcm, stereoConfig.servo_out_channel.c_str(), &servo_out_handler, &hud);
}
if (stereoConfig.battery_status_channel.length() > 0) {
battery_status_sub = lcmt_battery_status_subscribe(lcm, stereoConfig.battery_status_channel.c_str(), &battery_status_handler, &hud);
}
if (stereoConfig.cpu_info_channel1.length() > 0) {
cpu_info_sub1 = lcmt_cpu_info_subscribe(lcm, stereoConfig.cpu_info_channel1.c_str(), &cpu_info_handler, &recording_manager);
cpu_info_sub2 = lcmt_cpu_info_subscribe(lcm, stereoConfig.cpu_info_channel2.c_str(), &cpu_info_handler, &recording_manager);
cpu_info_sub3 = lcmt_cpu_info_subscribe(lcm, stereoConfig.cpu_info_channel3.c_str(), &cpu_info_handler, &recording_manager);
}
if (stereoConfig.log_size_channel1.length() > 0) {
log_size_sub1 = lcmt_log_size_subscribe(lcm, stereoConfig.log_size_channel1.c_str(), &log_size_handler, &hud);
log_size_sub2 = lcmt_log_size_subscribe(lcm, stereoConfig.log_size_channel2.c_str(), &log_size_handler, &hud);
log_size_sub3 = lcmt_log_size_subscribe(lcm, stereoConfig.log_size_channel3.c_str(), &log_size_handler, &hud);
}
} // end show_display || publish_all_images
// load calibration
OpenCvStereoCalibration stereoCalibration;
if (LoadCalibration(stereoConfig.calibrationDir, &stereoCalibration) != true)
{
cerr << "Error: failed to read calibration files. Quitting." << endl;
return -1;
}
int inf_disparity_tester, disparity_tester;
disparity_tester = GetDisparityForDistance(10, stereoCalibration, &inf_disparity_tester);
std::cout << "computed disparity is = " << disparity_tester << ", inf disparity = " << inf_disparity_tester << std::endl;
// subscribe to the stereo control channel
stereo_control_sub = lcmt_stereo_control_subscribe(lcm, stereoConfig.stereoControlChannel.c_str(), &lcm_stereo_control_handler, NULL);
Mat imgDisp;
Mat imgDisp2;
// initilize default parameters
//PushbroomStereoState state; // HACK
state.disparity = stereoConfig.disparity;
state.zero_dist_disparity = stereoConfig.infiniteDisparity;
state.sobelLimit = stereoConfig.interestOperatorLimit;
state.horizontalInvarianceMultiplier = stereoConfig.horizontalInvarianceMultiplier;
state.blockSize = stereoConfig.blockSize;
state.random_results = random_results;
state.check_horizontal_invariance = true;
if (state.blockSize > 10 || state.blockSize < 1)
{
fprintf(stderr, "Warning: block size is very large "
"or small (%d). Expect trouble.\n", state.blockSize);
}
state.sadThreshold = stereoConfig.sadThreshold;
state.mapxL = stereoCalibration.mx1fp;
state.mapxR = stereoCalibration.mx2fp;
state.Q = stereoCalibration.qMat;
state.show_display = show_display;
state.lastValidPixelRow = stereoConfig.lastValidPixelRow;
Mat matL, matR;
bool quit = false;
if (recording_manager.UsingLiveCameras()) {
matL = GetFrameFormat7(camera);
matR = GetFrameFormat7(camera2);
if (recording_manager.InitRecording(matL, matR) != true) {
// failed to init recording, things are going bad. bail.
return -1;
}
// before we start, turn the cameras on and set the brightness and exposure
MatchBrightnessSettings(camera, camera2, true, force_brightness, force_exposure);
// grab a few frames and send them over LCM for the user
// to verify that everything is working
if (!show_display && !publish_all_images) {
printf("Sending init images over LCM... ");
fflush(stdout);
for (int i = 0; i < 5; i++) {
matL = GetFrameFormat7(camera);
SendImageOverLcm(lcm, "stereo_image_left", matL, 50);
matR = GetFrameFormat7(camera2);
SendImageOverLcm(lcm, "stereo_image_right", matR, 50);
// don't send these too fast, otherwise we'll flood the ethernet link
// and not actually be helpful
// wait one second
printf(".");
fflush(stdout);
sleep(1);
}
printf(" done.\n");
}
} // recording_manager.UsingLiveCameras()
// spool up worker threads
PushbroomStereo pushbroom_stereo;
// start the framerate clock
struct timeval start, now;
gettimeofday( &start, NULL );
while (quit == false) {
// get the frames from the camera
if (recording_manager.UsingLiveCameras()) {
// we would like to match brightness every frame
// but that would really hurt our framerate
// match brightness every 10 frames instead
if (numFrames % MATCH_BRIGHTNESS_EVERY_N_FRAMES == 0)
{
MatchBrightnessSettings(camera, camera2);
}
// capture images from the cameras
matL = GetFrameFormat7(camera);
matR = GetFrameFormat7(camera2);
// record video
recording_manager.AddFrames(matL, matR);
} else {
// using a video file -- get the next frame
recording_manager.GetFrames(matL, matR);
}
cv::vector<Point3f> pointVector3d;
cv::vector<uchar> pointColors;
cv::vector<Point3i> pointVector2d; // for display
cv::vector<Point3i> pointVector2d_inf; // for display
// do the main stereo processing
if (disable_stereo != true) {
gettimeofday( &now, NULL );
double before = now.tv_usec + now.tv_sec * 1000 * 1000;
pushbroom_stereo.ProcessImages(matL, matR, &pointVector3d, &pointColors, &pointVector2d, state);
gettimeofday( &now, NULL );
double after = now.tv_usec + now.tv_sec * 1000 * 1000;
timer_sum += after-before;
timer_count ++;
}
// build an LCM message for the stereo data
lcmt_stereo msg;
if (recording_manager.UsingLiveCameras() || stereo_lcm_msg == NULL) {
msg.timestamp = getTimestampNow();
} else {
// if we are replaying videos, preserve the timestamp of the original video
msg.timestamp = stereo_lcm_msg->timestamp;
}
msg.number_of_points = (int)pointVector3d.size();
float x[msg.number_of_points];
float y[msg.number_of_points];
float z[msg.number_of_points];
uchar grey[msg.number_of_points];
for (unsigned int i=0;i<pointVector3d.size();i++) {
x[i] = pointVector3d[i].x / stereoConfig.calibrationUnitConversion;
y[i] = pointVector3d[i].y / stereoConfig.calibrationUnitConversion;
z[i] = pointVector3d[i].z / stereoConfig.calibrationUnitConversion;
grey[i] = pointColors[i];
}
msg.x = x;
msg.y = y;
msg.z = z;
msg.grey = grey;
msg.frame_number = recording_manager.GetFrameNumber();
if (recording_manager.UsingLiveCameras()) {
msg.frame_number = msg.frame_number - 1; // minus one since recording manager has
// already recorded this frame (above in
// AddFrames) but we haven't made a message
// for it yet
}
msg.video_number = recording_manager.GetRecVideoNumber();
// publish the LCM message
if (last_frame_number != msg.frame_number) {
lcmt_stereo_publish(lcm, "stereo", &msg);
last_frame_number = msg.frame_number;
}
if (publish_all_images) {
if (recording_manager.GetFrameNumber() != last_playback_frame_number) {
SendImageOverLcm(lcm, "stereo_image_left", matL, 80);
SendImageOverLcm(lcm, "stereo_image_right", matR, 80);
last_playback_frame_number = recording_manager.GetFrameNumber();
}
//process LCM until there are no more messages
// this allows us to drop frames if we are behind
while (NonBlockingLcm(lcm)) {}
}
Mat matDisp, remapL, remapR;
if (show_display) {
// we remap again here because we're just in display
Mat remapLtemp(matL.rows, matL.cols, matL.depth());
Mat remapRtemp(matR.rows, matR.cols, matR.depth());
remapL = remapLtemp;
remapR = remapRtemp;
remap(matL, remapL, stereoCalibration.mx1fp, Mat(), INTER_NEAREST);
remap(matR, remapR, stereoCalibration.mx2fp, Mat(), INTER_NEAREST);
remapL.copyTo(matDisp);
//process LCM until there are no more messages
// this allows us to drop frames if we are behind
while (NonBlockingLcm(lcm)) {}
} // end show_display
if (show_display) {
for (unsigned int i=0;i<pointVector2d.size();i++) {
int x2 = pointVector2d[i].x;
int y2 = pointVector2d[i].y;
//int sad = pointVector2d[i].z;
rectangle(matDisp, Point(x2,y2), Point(x2+state.blockSize, y2+state.blockSize), 0, CV_FILLED);
rectangle(matDisp, Point(x2+1,y2+1), Point(x2+state.blockSize-1, y2-1+state.blockSize), 255);
}
// draw pixel blocks
if (lineLeftImgPosition >= 0 && lineLeftImgPositionY > 1) {
DisplayPixelBlocks(remapL, remapR, lineLeftImgPosition - state.blockSize/2, lineLeftImgPositionY - state.blockSize/2, state, &pushbroom_stereo);
}
// draw a line for the user to show disparity
DrawLines(remapL, remapR, matDisp, lineLeftImgPosition, lineLeftImgPositionY, state.disparity, state.zero_dist_disparity);
if (visualize_stereo_hits == true && stereo_lcm_msg != NULL) {
// transform the points from 3D space back onto the image's 2D space
vector<Point3f> lcm_points;
Get3DPointsFromStereoMsg(stereo_lcm_msg, &lcm_points);
// draw the points on the unrectified image (to see these
// you must pass the -u flag)
Draw3DPointsOnImage(matL, &lcm_points, stereoCalibration.M1, stereoCalibration.D1, stereoCalibration.R1, 128);
}
if (show_unrectified == false) {
imshow("Input", remapL);
imshow("Input2", remapR);
} else {
imshow("Input", matL);
imshow("Input2", matR);
}
if (display_hud) {
Mat with_hud;
recording_manager.SetHudNumbers(&hud);
hud.DrawHud(matDisp, with_hud);
if (record_hud) {
// put this frame into the HUD recording
recording_manager.RecFrameHud(with_hud);
}
imshow("Stereo", with_hud);
} else {
imshow("Stereo", matDisp);
}
char key = waitKey(show_display_wait);
if (key != 255 && key != -1)
{
cout << endl << key << endl;
}
switch (key)
{
case 'T':
state.disparity --;
break;
case 'R':
state.disparity ++;
break;
case 'w':
state.sobelLimit += 10;
break;
case 's':
state.sobelLimit -= 10;
break;
case 'd':
state.horizontalInvarianceMultiplier -= 0.1;
break;
case 'D':
state.horizontalInvarianceMultiplier += 0.1;
break;
case 'g':
state.blockSize ++;
break;
case 'b':
state.blockSize --;
if (state.blockSize < 1) {
state.blockSize = 1;
}
break;
case 'Y':
state.sadThreshold += 50;
break;
case 'y':
state.sadThreshold ++;
break;
case 'h':
state.sadThreshold --;
break;
case 'H':
state.sadThreshold -= 50;
break;
case 'm':
if (recording_manager.UsingLiveCameras()) {
MatchBrightnessSettings(camera, camera2, true, force_brightness, force_exposure);
}
break;
case '1':
force_brightness --;
if (recording_manager.UsingLiveCameras()) {
MatchBrightnessSettings(camera, camera2, true, force_brightness, force_exposure);
}
break;
case '2':
force_brightness ++;
if (recording_manager.UsingLiveCameras()) {
MatchBrightnessSettings(camera, camera2, true, force_brightness, force_exposure);
}
break;
case '3':
force_exposure --;
if (recording_manager.UsingLiveCameras()) {
MatchBrightnessSettings(camera, camera2, true, force_brightness, force_exposure);
}
break;
case '4':
force_exposure ++;
if (recording_manager.UsingLiveCameras()) {
MatchBrightnessSettings(camera, camera2, true, force_brightness, force_exposure);
}
break;
case '5':
// to show SAD boxes
state.sobelLimit = 0;
state.sadThreshold = 255;
break;
case 'I':
state.check_horizontal_invariance = !state.check_horizontal_invariance;
break;
case '.':
recording_manager.SetPlaybackFrameNumber(recording_manager.GetFrameNumber() + 1);
break;
case ',':
recording_manager.SetPlaybackFrameNumber(recording_manager.GetFrameNumber() - 1);
break;
case '>':
recording_manager.SetPlaybackFrameNumber(recording_manager.GetFrameNumber() + 50);
break;
case '<':
recording_manager.SetPlaybackFrameNumber(recording_manager.GetFrameNumber() - 50);
break;
//case 'k':
// state.zero_dist_disparity ++;
// break;
case 'l':
state.zero_dist_disparity --;
break;
case 'o':
inf_sad_add --;
break;
case 'p':
inf_sad_add ++;
break;
case '[':
y_offset --;
if (y_offset < 0) {
y_offset = 0;
}
break;
case ']':
y_offset ++;
break;
case 'v':
display_hud = !display_hud;
break;
case 'c':
hud.SetClutterLevel(hud.GetClutterLevel() + 1);
break;
case 'C':
hud.SetClutterLevel(hud.GetClutterLevel() - 1);
break;
case '}':
hud.SetPitchRangeOfLens(hud.GetPitchRangeOfLens() + 1);
break;
case '{':
hud.SetPitchRangeOfLens(hud.GetPitchRangeOfLens() - 1);
break;
case 'S':
// take a screen cap of the left and right images
// useful for putting into a stereo tuner
printf("\nWriting left.ppm...");
imwrite("left.ppm", remapL);
printf("\nWriting right.ppm...");
imwrite("right.ppm", remapR);
printf("\ndone.");
break;
case 'V':
// record the HUD
record_hud = true;
recording_manager.RestartRecHud();
break;
/*
case 'j':
state.debugJ --;
break;
case 'J':
state.debugJ ++;
break;
case 'i':
state.debugI --;
break;
case 'I':
state.debugI ++;
break;
case 'k':
state.debugDisparity --;
break;
case 'K':
state.debugDisparity ++;
break;
*/
case 'q':
quit = true;
break;
}
if (key != 255 && key != -1)
{
cout << "sadThreshold = " << state.sadThreshold << endl;
cout << "sobelLimit = " << state.sobelLimit << endl;
cout << "horizontalInvarianceMultiplier = " << state.horizontalInvarianceMultiplier << endl;
cout << "brightness: " << force_brightness << endl;
cout << "exposure: " << force_exposure << endl;
cout << "disparity = " << state.disparity << endl;
cout << "inf_disparity = " << state.zero_dist_disparity << endl;
cout << "inf_sad_add = " << inf_sad_add << endl;
cout << "blockSize = " << state.blockSize << endl;
cout << "frame_number = " << recording_manager.GetFrameNumber() << endl;
cout << "y offset = " << y_offset << endl;
cout << "PitchRangeOfLens = " << hud.GetPitchRangeOfLens() << endl;
}
} // end show_display
numFrames ++;
// check for new LCM messages
NonBlockingLcm(lcm);
if (quiet_mode == false || numFrames % 100 == 0) {
// compute framerate
gettimeofday( &now, NULL );
elapsed = (now.tv_usec / 1000 + now.tv_sec * 1000) -
(start.tv_usec / 1000 + start.tv_sec * 1000);
printf("\r%d frames (%lu ms) - %4.1f fps | %4.1f ms/frame, stereo: %f", numFrames, elapsed, (float)numFrames/elapsed * 1000, elapsed/(float)numFrames, timer_sum/(double)timer_count);
fflush(stdout);
}
} // end main while loop
printf("\n\n");
destroyWindow("Input");
destroyWindow("Input2");
destroyWindow("Stereo");
// close camera
if (recording_manager.UsingLiveCameras()) {
StopCapture(d, camera);
StopCapture(d2, camera2);
}
return 0;
}