/*
 * yuvnull - reads a yuv stream from stdin and writes it to stdout.
 *
 * Copyright (C) 2001, pHilipp Zabel <pzabel@gmx.de>
 *
 * This program is free software; you can redistribute it and/or
 * modify it under the terms of the GNU General Public License
 * as published by the Free Software Foundation; either version 2
 * of the License, or (at your option) any later version.
 *
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.	 See the
 * GNU General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License
 * along with this program; if not, write to the Free Software
 * Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA	02111-1307, USA.
 */

#ifdef HAVE_CONFIG_H
#include "config.h"
#endif

#include <stdio.h>
#include <stdlib.h>
#include <unistd.h>
#include <sys/stat.h>
#include <fcntl.h>
#include "yuv4mpeg.h"

#define OUT 0

static void usage (progname) {
	fprintf (stderr, "usage:  %s [-b <basename>] [-f <framecount>]\n",progname);
}
int do_pipe(char * pipestream,int dir,int *fd){
	int rev[]={1,0};
	int fda[2];
	int pid;

	pipe(fda);

	pid=fork();
	switch(pid){
		case -1:
			break;
		case 0:
			close(0);
			dup(fda[0]);
			close(fda[0]);
			close(fda[1]);
			execlp("mpeg2enc","mpeg2enc","-f","1","-v","0",
				"-o",pipestream,0
			);
			break;
		default:
			close(fda[0]);
			break;
	}
	*fd=fda[rev[dir]];
//	return open(pipestream,O_WRONLY|O_CREAT,S_IRUSR|S_IWUSR);
	return pid;
}
int main (int argc, char *argv[]){
	int in_fd  = 0;	/* stdin */
	int out_fd = 1;	/* stdout */
	unsigned char *yuv[3];  /* output */
	y4m_stream_info_t streaminfo;
	y4m_frame_info_t frameinfo;
	int i;
	int w, h;
	int frames=100;
	char *basename=NULL;
	char filename[1024];
	int count,filenum=-1,pid;

	i=0;
	while (i<argc) {
		switch (argv[i][1]){
			case 'f':
				i++;
				if (i>=argc){
					usage(argv[0]);
					exit(1);
				}
				frames=atoi(argv[i]);
				if (frames==0){
					usage(argv[0]);
					exit(1);
				}
				break;
			case 'b':
				i++;
				if (i>=argc){
					usage(argv[0]);
					exit(1);
				}
				basename=argv[i];
				break;
			case 'h':
				usage(argv[0]);
				exit(0);
				break;
			default:
		}
		i++;
	}
	if (basename==NULL){
		basename="chunk%02d.mpg";
	}
	fprintf(stderr,"%s %d\n",basename,frames);
	count=frames;

	y4m_init_stream_info (&streaminfo);
	y4m_init_frame_info (&frameinfo);

	i = y4m_read_stream_header (in_fd, &streaminfo);
	if (i != Y4M_OK) {
		fprintf (stderr, "%s: input stream error - %s\n", 
			 argv[0], y4m_strerr(i));
		exit (1);
	}
	w = y4m_si_get_width(&streaminfo);
	h = y4m_si_get_height(&streaminfo);

	yuv[0] = malloc (w * h);
	yuv[1] = malloc (w * h / 4);
	yuv[2] = malloc (w * h / 4);


	while (1) {
		if (count==frames) {
			count=0;
			if(out_fd>1){
				close(out_fd);
			}
			filenum++;
			sprintf(filename,basename,filenum);
			pid=do_pipe(filename,OUT, &out_fd);
			y4m_write_stream_header (out_fd, &streaminfo);
		}
		i = y4m_read_frame(in_fd, &streaminfo, &frameinfo, yuv);
		if (i == Y4M_ERR_EOF) {
			exit (0);
		}
		else if (i != Y4M_OK){
			exit (1);
		}
		y4m_write_frame (out_fd, &streaminfo, &frameinfo, yuv);
		count++;
	}

}

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