v4l.c

来自「一个很好用的MPEG1/4的开源编码器的应用程序」· C语言 代码 · 共 65 行

/* 
 *    input_v4l.c
 *
 *	Copyright (C) Vivien Chappelier - 2001
 *
 *  This file is part of fame, a free MPEG encoder.
 *	
 *  fame 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, or (at your option)
 *  any later version.
 *   
 *  fame 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 GNU Make; see the file COPYING.  If not, write to
 *  the Free Software Foundation, 675 Mass Ave, Cambridge, MA 02139, USA. 
 *
 */

#include <stdio.h>
#include <signal.h>
#include "v4l.h"

input_v4l_context_t *v4l_init(int width, int height)
{
  input_v4l_context_t *v4l;
  int channel = 0;

  v4l = (input_v4l_context_t *) malloc(sizeof(input_v4l_context_t));

  /* open device */
  if (fg_open_device (&v4l->fg, video_device) != 0)
    return(NULL);

  /* set format */
  fg_start_grab_image(&v4l->fg, width, height, FORMAT_YUV420P);

  /* set TV source */
  fg_set_mode(&v4l->fg, VIDEOMODE_AUTO);

  /* enable audio */
  fg_set_audio(&v4l->fg, 65535);

  return(v4l);
}

void v4l_close(input_v4l_context_t *v4l) {
  fg_stop_grab_image(&v4l->fg);
  fg_set_audio(&v4l->fg, 0);
  fg_close_device (&v4l->fg);
  free(v4l);
}

int v4l_read(input_v4l_context_t *v4l, void *buffer, int size)
{
  fg_get_next_image(&v4l->fg);
  if(v4l->fg.current_image)
    memcpy(buffer, v4l->fg.current_image, size);
}