Desktop
/* $Id: video.c,v 1.2 2012/10/12 16:00:33 khorben Exp $ */
/* Copyright (c) 2012 Pierre Pronchery <khorben@defora.org> */
/* This file is part of DeforaOS Desktop Phone */
/* 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, version 3 of the License.
*
* 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, see <http://www.gnu.org/licenses/>. */
/* TODO:
* - attempt to open the video device at regular intervals
* - display a window even if it was impossible to open a capture device */
#include <sys/ioctl.h>
#ifdef __NetBSD__
# include <sys/videoio.h>
#else
# include <linux/videodev2.h>
#endif
#include <fcntl.h>
#include <unistd.h>
#include <string.h>
#include <errno.h>
#include <System.h>
#include <Desktop.h>
#include "Phone.h"
/* Video */
/* private */
/* types */
typedef struct _PhonePlugin
{
PhonePluginHelper * helper;
int fd;
guint source;
Buffer * buffer;
/* widgets */
GtkWidget * window;
GtkWidget * area;
} VideoPhonePlugin;
/* prototypes */
/* plug-in */
static VideoPhonePlugin * _video_init(PhonePluginHelper * helper);
static void _video_destroy(VideoPhonePlugin * video);
/* useful */
static int _video_ioctl(VideoPhonePlugin * video, unsigned long request,
void * data);
/* callbacks */
static gboolean _video_on_closex(gpointer data);
static gboolean _video_on_refresh(gpointer data);
/* public */
/* variables */
PhonePluginDefinition plugin =
{
"Video",
"camera-video",
NULL,
_video_init,
_video_destroy,
NULL,
NULL
};
/* private */
/* functions */
/* video_init */
static VideoPhonePlugin * _video_init(PhonePluginHelper * helper)
{
VideoPhonePlugin * video;
struct v4l2_capability cap;
struct v4l2_cropcap cropcap;
struct v4l2_crop crop;
struct v4l2_format format;
if((video = object_new(sizeof(*video))) == NULL)
return NULL;
video->helper = helper;
/* FIXME let this be configurable */
video->fd = open("/dev/video0", O_RDWR);
video->buffer = buffer_new(0, NULL);
video->source = 0;
video->window = NULL;
/* check for errors */
if(video->buffer == NULL
|| video->fd < 0
|| _video_ioctl(video, VIDIOC_QUERYCAP, &cap) == -1
|| (cap.capabilities & V4L2_CAP_VIDEO_CAPTURE) == 0
/* FIXME also implement mmap() and streaming */
|| (cap.capabilities & V4L2_CAP_READWRITE) == 0)
{
_video_destroy(video);
return NULL;
}
/* reset cropping */
memset(&cropcap, 0, sizeof(cropcap));
cropcap.type = V4L2_BUF_TYPE_VIDEO_CAPTURE;
if(_video_ioctl(video, VIDIOC_CROPCAP, &cropcap) == 0)
{
/* reset to default */
crop.type = V4L2_BUF_TYPE_VIDEO_CAPTURE;
crop.c = cropcap.defrect;
if(_video_ioctl(video, VIDIOC_S_CROP, &crop) == -1
&& errno == EINVAL)
helper->error(helper->phone, "Cropping not supported",
0);
}
/* obtain the current format */
if(_video_ioctl(video, VIDIOC_G_FMT, &format) == -1
|| buffer_set_size(video->buffer,
format.fmt.pix.sizeimage) != 0)
{
_video_destroy(video);
return NULL;
}
/* create the window */
video->window = gtk_window_new(GTK_WINDOW_TOPLEVEL);
gtk_window_set_resizable(GTK_WINDOW(video->window), FALSE);
g_signal_connect_swapped(video->window, "delete-event", G_CALLBACK(
_video_on_closex), video);
video->area = gtk_drawing_area_new();
gtk_widget_set_size_request(video->area, format.fmt.pix.width,
format.fmt.pix.height);
gtk_container_add(GTK_CONTAINER(video->window), video->area);
gtk_widget_show_all(video->window);
video->source = g_timeout_add(1000, _video_on_refresh, video);
return video;
}
/* video_destroy */
static void _video_destroy(VideoPhonePlugin * video)
{
if(video->window != NULL)
gtk_widget_destroy(video->window);
if(video->source != 0)
g_source_remove(video->source);
if(video->fd >= 0)
close(video->fd);
buffer_delete(video->buffer);
object_delete(video);
}
/* useful */
/* video_ioctl */
static int _video_ioctl(VideoPhonePlugin * video, unsigned long request,
void * data)
{
int ret;
for(;;)
if((ret = ioctl(video->fd, request, data)) != -1
|| errno != EINTR)
break;
return ret;
}
/* callbacks */
/* video_on_closex */
static gboolean _video_on_closex(gpointer data)
{
VideoPhonePlugin * video = data;
gtk_widget_hide(video->window);
if(video->source != 0)
g_source_remove(video->source);
video->source = 0;
return TRUE;
}
/* video_on_refresh */
static gboolean _video_on_refresh(gpointer data)
{
VideoPhonePlugin * video = data;
/* FIXME no longer block on read() */
if(read(video->fd, buffer_get_data(video->buffer),
buffer_get_size(video->buffer)) <= 0)
{
/* this error can be ignored */
if(errno == EAGAIN)
return TRUE;
close(video->fd);
video->fd = -1;
return FALSE;
}
return TRUE;
}