Record.c

// TCap v0.1
// (C) Thomas Hargrove
// http://toonarchive.com/tcap

/***************************************************************************
 *                                                                         *
 *   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.                                   *
 *                                                                         *
 ***************************************************************************/

// Modified by Kevin 2004&2016

#include <unistd.h>
#include <stdlib.h>
#include <stdio.h>
#include <fcntl.h>
#include <sys/ioctl.h>
#include <sys/mman.h>
#include <errno.h>
#include <libv4l1-videodev.h>
#include "record.h"

//#define   WIDTH 640
//#define   HEIGHT 480
#define     p(x) printf("%d\n",x);
#define     E(x) printf("%s\n",x);

static struct   video_capability  capability;
static int  fd = -1;
static struct   video_mbuf gb_buffers = { 2*WIDTH*HEIGHT*3, 0, {0,WIDTH*HEIGHT*3 }};
static char     *map = NULL;
static struct   video_mmap my_buf;

struct video_channel vch;

int main(int argc, char *argv[])
{
   char my_video_dev[100]  = "/dev/video0";

   // --------------------------------------------------------------------------
   // Get the v4l capture set up
   // --------------------------------------------------------------------------
   if (-1 == (fd = open(my_video_dev, O_RDWR))) {
    printf("Error opening device: %s\n", my_video_dev);
    goto err;
   }
   if (-1 == ioctl(fd,VIDIOCGCAP,&capability)) {
    printf("Error: ioctl(fd,VIDIOCGCAP,&capability)\n");
    goto err;
   }

   vch.channel = 0;
   vch.norm = VIDEO_MODE_PAL;
   if(-1 == ioctl(fd, VIDIOCSCHAN,&vch)) {
         perror("Setting channel\n");
         goto err;
   }


   fcntl(fd,F_SETFD,FD_CLOEXEC);
   if (-1 == ioctl(fd,VIDIOCGMBUF,&gb_buffers)) {
    printf("Error: Error getting buffers\n");
    goto err;
   }

   map = mmap(0,gb_buffers.size,PROT_READ|PROT_WRITE,MAP_SHARED,fd,0);
   if (map == NULL) {
    printf("Error: Mmap returned NULL\n");
    goto err;
   }
   // Set up out capture to use the correct resolution
   my_buf.width = WIDTH;
   my_buf.height = HEIGHT;
   my_buf.format = VIDEO_PALETTE_RGB24;

   // Tell the capture card to fill frame 0
   my_buf.frame = 0;
   if (-1 == ioctl(fd, VIDIOCMCAPTURE, &my_buf)) {
    printf("Error: Grabber chip can't sync (no station tuned in?)\n");
    goto err;
   }


   unsigned long freqlist[14]= {623250,45250,55250,62250,175250,182250,189250,196250,203250,210250,217250,224250};
   unsigned long freq;
   int chan;
   if (argc >= 1)
   {
    //freq = (freqlist[argv[1]]*16)/1000;
    //if ( -1 == ioctl(fd, VIDIOCSFREQ, freq) );
   //}else{
        //freq = (freqlist[0]*16)/1000;
    //if ( -1 == ioctl(fd, VIDIOCSFREQ, freq) );
   }

   int done=0;
   while ( done < RECORD )
   {
    my_buf.frame = 1;
    if (-1 == ioctl(fd, VIDIOCMCAPTURE, &my_buf)) {
        printf("Error: Grabber chip can't sync (no station tuned in?)\n");
        done=1;
    }

    my_buf.frame = 0;
    if (-1 == ioctl(fd, VIDIOCSYNC, &my_buf.frame)) {
         printf("Error on sync!\n");
         done=1;
    }

    record(map,"video-output");
    my_buf.frame = 0;
    if (-1 == ioctl(fd, VIDIOCMCAPTURE, &my_buf)) {
        printf("Error: Grabber chip can't sync (no station tuned in?)\n");
        done=1;
    }

    my_buf.frame = 1;
    if (-1 == ioctl(fd, VIDIOCSYNC, &my_buf.frame)) {
        printf("Error on sync!\n");
        done=1;
    }

    record(map,"video-output");
    done++;
   }

   // Return screen to text mode.
   err:
   return EXIT_SUCCESS;
}